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are there some body have exoerience on endothelial cell culture,especially microvascular, could you summarize about that including isolate, subculture,... in detail?
abstract
It is controversial whether mutations in cystic fibrosis transmembrane conductance regulator intrinsically dysregulate inflammation. We characterized passage 2 human tracheobronchial epithelial cell cultures morphologically and physiologically and determined whether cytokine production or nuclear factor-[kappa]B activation was systematically altered in cystic fibrosis (CF) cells. Non-CF and CF cells originating from a total of 33 and 25 lungs, respectively, were available for culture on plastic or at an air-liquid interface until well differentiated. Forskolin-stimulated short-circuit currents were present in representative polarized non-CF cultures and were absent in CF cultures, whereas uridine 5''-triphosphate-stimulated currents were present in both. Constitutive or interleukin (IL)-1[beta]-induced IL-8 or IL-6 secretion or nuclear factor-[kappa]B activity was not significantly different between non-CF and CF cells. The cytokines regulated upon activation, normal T cell expressed and secreted (RANTES) and IL-10 were not detectable. Stimulation with tumor necrosis factor-[alpha] or a synthetic toll-like receptor 2 agonist or variable doses and times of Staphylococcus aureus culture filtrate revealed a single dose- and time-dependent difference in IL-8 production by CF cells. Interestingly, although IL-8 secretion after stimulation with Pseudomonas aeruginosa filtrates was not greater in CF cells in the absence of human serum, it was variably greater in its presence. Thus, although exaggerated responses may develop under certain conditions, our results do not support an overall intrinsically hyperinflammatory phenotype in CF cells.
Morbidity and mortality in cystic fibrosis (CF) are largely due to chronic endobronchial bacterial infection with severe neutrophilic inflammation. Ongoing infections result from impaired mucociliary clearance subsequent to defective ion transport, which depletes the periciliary liquid layer and raises mucus viscosity (1). Defects in antimicrobial activity (2), diminished binding and uptake of Pseudomonas aeruginosa by epithelial cells (3), or defective neutrophil phagocytosis (4) may also contribute. The efficacy of antiinflammatory therapies (5, 6) underscores the importance of inflammation to cause loss of lung function. Increased interleukin (IL)-8 and neutrophils found in CF bronchial lavage fluid without apparent infection (7, 8) or when normalized for bacterial burden (9, 10) suggest that defective CF transmembrane conductance regulator (CFTR) might directly dysregulate inflammation. It is reported that fetal human CF airways and lung tissues, even when sterile, accumulate more leukocytes compared with non-CF airways when implanted in immune-deficient mice (11, 12). However, the notion of inflammation without infection as a primary defect in CF infants has been challenged (13).
Several cell culture studies support the concept of dysregulated inflammatory responses in CF epithelial culls. IL-8 and IL-6 secretion in response to P. aeruginosa was elevated and more sustained in CFTR mutant cell lines (14, 15), and higher baseline nuclear factor-[kappa]B (NF-[kappa] activation was reversed by the introduction of normal CFTR or by culture at permissive temperature (16). Excessive cytokine production may reflect a cell stress response caused by mutant, misfolded CFTR accumulation in the endoplasmic reticulum, but cells with the G551D mutation, which express and traffic inactive CFTR to the cell surface, also had enhanced Ca^sup 2+^ signaling and greater NF-[kappa]B activity (17). Similarly, two groups (18, 19) found that CF tracheal gland cells exhibit elevated basal and stimulated levels of IL-8 and IL-6. The CF gland cells had reduced levels of the inhibitor of nuclear factor [kappa]B[alpha] (I[kappa]B[alpha]), which was reversed by genistein, presumably because of enhanced delivery of mutant CFTR to the cell surface (20). Hypertonic stress also had a greater IL-8-inducing effect on CF gland cells (21), perhaps indicating a lower "stress threshold." Furthermore, a recent report showed equal baseline but higher tumor necrosis factor-[alpha] (TNF-[alpha])-stimulated NF-[kappa]B activity and IL-8 production in a CF cell line that was ascribed to altered I[kappa]B[beta], rather than I[kappa]B[alpha], activity (22).作者: tieshazhang 时间: 2012-9-27 10:55
Other studies suggest no or only small differences related to inflammation in CF cells. In primary human epithelial cells or cell lines on plastic, release of regulated upon activation, normal T cell expressed and secreted (RANTES) was dependent on CFTR expression, but basal or stimulated secretion of IL-8 or monocyte chemoattractant protein-1 was independent of CFTR status (23). No differences between CF and non-CF derived cell lines were observed for secretion of IL-8 or IL-6 induced by a variety of stimuli, including P. aeruginosa products (24). Similarly, no differences between CF and non-CF cell lines were found for IL-8 production in experiments in which correction of the CFTR defect normalized Cl" secretion and P. aerugmoi« adherence (25). Still another study failed to detect differences in TNF-[alpha]-stimulated IL-8 secretion between paired cell lines where CFTR deficiency was corrected by an adenoviral vector (26). Reduced, as opposed to increased, IL-8 production by CF cell lines was reported that was reversed by the introduction of wild-type CFTR (27). Cells freshly harvested from inflamed CF lungs showed evidence for enhanced cytokine production (28), but no difference in baseline or stimulated IL-8 secretion due to CFTR status was detected after time in primary culture (26). No significant differences in basal IL-8 production or NF-[kappa]B activation were observed in primary nasal epithelial cells from CF versus non-CF donors, but P. aeruginosa adhered more readily and thus elicited a greater IL-8 response in CF cells (29). Thus, it remains controversial whether intrinsically exaggerated inflammatory responses result from mutations in CFTR.
Passaged and cryopreserved primary human tracheobronchial epithelial (hTBE) cells can be grown at an air-liquid interface (ALI), where they become well differentiated, resembling the in vivo morphology. We sought to establish whether passaged CF and non-CF hTBE cells grown at an ALI until well differentiated were similar morphologically and displayed physiologic properties consistent with their genotype. We then examined whether cytokine production or NF-[kappa]B activation was systematically altered in CF cells at baseline or in response to several relevant challenges, including IL-1[beta], sterile culture filtrates of Staphylococcus aureus and P. aeruginosa, a synthetic toll-like receptor (TLR)-2 agonist or TNF-[alpha].
METHODS
Cell Culture
Human lung tissue was procured under an institutional review boardapproved protocol, and epithelial cell harvest and culture were performed using established procedures (30, 31). Samples originated from a total of 33 non-CF and 25 CF lungs (Table 1). Cryopreserved passage 1 cells were cultured in bronchial epithelial growth medium on Vitrogencoated plastic dishes. At 75-90% confluence, passage 2 cells were transferred to type IV collagen-coated Snapwells (Corning Costar, Cambridge, MA) for use in Ussing chambers or 0.4-µm T-Clear (Corning Costar) or Millicell CM membranes (Millipore, Bedford, MA) in low-endotoxin ALI medium (32). Beginning at Days 7-10, cells were maintained at an ALI. Histology was performed on formalin-fixed, paraffin-embedded cells at Day 21. Passage 2 cells were also cultured on 96-well plastic plates (35,000 cells/well) in bronchial epithelial growth medium. For all experiments, the minimum sample size was cultures from four individuals, but the sample size ranged up to 11. Samples were obtained from triplicate culture wells.
TABLE 1. DEMOGRAPHICS OF AIRWAY TISSUE DONORS AND GUIDE TO EXPERIMENTAL USE OF CELLS
Bioelectric Properties
Six and 21 days after formation of an ALI, Snapwell inserts were mounted in Ussing chambers (Physiologic Instruments Inc., San Diego, CA). The epithelium was voltage clamped, and short-circuit current (I^sub sc^) and transepithelial resistance measured (Physiologic Instruments). Data were analyzed using Acquire and Analysis (version 1.2) software (Physiologic Instruments). Solutions and compound additions are given in the online supplement.作者: tieshazhang 时间: 2012-9-27 10:56
Bacterial Filtrates
S. aureus strain ATCC 29213 and P. aeruginosa strain ATCC 27853 were grown in trypticase soy broth for 72 hours at 37° with shaking at 250 rpm. Cultures were centrifuged at 5,500 × g (4°C) for 30 minutes, and supernatants were 0.45 µm filtered, aliquoted, and stored at -20°C.
Cell Stimulation and Biochemical Measurements
Well differentiated cells on membranes and poorly differentiated cells grown on plastic were challenged with IL-1[beta], S. aureus, or P. aeruginosa filtrates, the TLR-2 agonist S-[2,3-bis(palmitoyloxy)-(2-RS)-propyl]-N-palmitoyl-(R)-Cys-(S)-Ser-Lys4-OH, trihydrochloride (Pam3Cys), or TNF-[alpha] as indicated. Cytokines, lactate dehydrogenase (LDH), and DNA were assayed as described in the online supplement.
Electrophoretic Mobility Shift Assays
hTBE cells on 24-mm inserts were treated with buffer or IL-1[beta] (5 ng/ml) for 1 hour, and nuclear extracts were prepared from three replicate wells and processed as described previously (32). Loading of gels was normalized for the protein content of the nuclear extracts.
Statistical Analysis
Data are presented as the means ± SEM. Raw cytokine concentrations, fold changes versus control subjects, or values normalized for DNA are given as indicated. Log transformation was used to achieve a normal distribution, and analysis of variance with standard weighted means was performed using VassarStats software (cuturl('http://faculty.vassar.edu./') lowry/VassarStats.html). Where appropriate, significance between groups was determined using Tukey's lest and was accepted if p was less than 0.05.
RESULTS
It is controversial whether the CF defect intrinsically alters the production of inflammatory mediators by airway epithelial cells. Although many prior investigations used cell lines, our approach was to study well differentiated, passaged, primary non-CF and CF hTBE cells.
Morphologic and Electrophysiologic Properties of Well Differentiated hTBE Cells
In an initial experiment, we simultaneously thawed cryopreserved primary epithelial cells derived from six non-CF and six CF airway specimens. All 12 cultures were initiated simultaneously, thus minimizing one source of experimental variability, and all cultures grew well as passage 1 cells on plastic and were transferred to porous supports as passage 2 cells. All passage 2 cells became confluent within 7-10 days, at which point an ALI was established. By 21 days after ALI, both CF and non-CF hTBE cells differentiated into a pseudostratified mucociliary epithelium resembling the in vivo phenotypc. Although there was some variability in the thickness of the cell layer, the percentage of mucous goblet cells, and the extent of ciliation, there were no systematic morphologic differences related to derivation from non-CF versus CF airways. Representative photomicrographs are shown in Figure 1.
Using replicate cultures from the same 12 individuals, we determined whether polarized hTBE cells were physiologically consistent with their CF versus non-CF genotype. We performed Ussing chamber studies of all specimens at 6 days after ALI and in five of six CF and four of six non-CF specimens at 21 days after ALI. Representative tracings and the mean data are given in Figure 2 and Table 2. At Day 6, forskolin did not stimulate I^sub sc^ in any of the CF cultures but did in all six of the non-CF cultures, whereas both cell types responded to uridine 5''-triphosphate. At 21 days after ALI, CF and non-CF cells demonstrated similar basal I^sub sc^, and the I^sub sc^ from the CF cells had a significantly larger amiloride-sensitive component compared with normal subjects. Similar to the earlier time point, forskolin did not stimulate I^sub sc^ in CF cells but did in non-CF cells, whereas both cell types responded to uridine 5''-triphosphate. Thus, the electrophysiologic properties of the polarized cultures reproduce important features of the CF airway epithelial phenotype.作者: tieshazhang 时间: 2012-9-27 10:56
Figure 7. Representative histology of non-cystic fibrosis (CF) (A) and CF ( well differentiated Day 21 air-liquid interface (ALI) human tracheobronchial epithelial (hTBE) cell cultures. Both cell types reproduced a pseudostratified mucociliary epithelium that resembled the in vivo phenotype. The T-Clear porous support is visible below the cells. Original magnification ×200, hematoxylin and eosin stain.
Cytokine Secretion at Baseline and in Response to IL-1[beta]
Excessive basal or stimulated cytokine secretion has been implicated in the pathogenesis of CF airway inflammation. Therefore, we quantitated IL-8 or IL-6 secretion by replicate wells of the same set of cultures that we had characterized morphologically and electrophysiologically (Figure 3). We used 5 ng/ml of IL-1[beta] a commonly used dose shown to be just beyond the beginning of the plateau response level in preliminary dose-response experiments (data not shown). Unstimulated non-CF and CF cultures produced similar amounts of IL-8 (2.3 ± 0.5 and 1.6 ± 0.4 ng/ml, respectively). Sham treatment (phosphate-buffered saline [PBS] instead of PBS plus IL-1[beta]) did not increase IL-8 secretion in either type of culture, whereas stimulation with IL-1[beta] increased the levels of IL-8 nearly 10-fold. However, there were no statistically significant differences in IL-8 secretion between non-CF and CF cells (13.9 ± 1.8 and 16.1 ± 1.6 ng/ml, respectively), even when expressed as fold changes (8.26 ± 1.65 and 12.26 ± 3.81, respectively). In this experiment, baseline secretion of IL-6 was undetectable in most cultures, and stimulation with IL-1[beta] increased IL-6 somewhat more in CF than in non-CF cultures (417 ± 80 and 183 ± 63 pg/ml, respectively), but the change was not significant by analysis of variance of logtransformed values (p = 0.16). Fold change comparisons for IL-6 were not possible because so many of the starting values were 0. Neither IL-10 nor RANTES was detectable in these cultures.
Activation of NF-[kappa]B at Baseline and in Response to IL-1[beta]
Because the promoter region of several important inflammatory mediators, including IL-8 and IL-6, contain NF-[kappa]B consensus sites and because of reports of constitutive activation of NF-[kappa]B in CF cells, we performed NF-[kappa]B electrophoretic mobility shift assay in the same set of CF and non-CF hTBE cultures in which morphology, physiology, and cytokine release were studied (Figure 4). Both CF and non-CF nuclei contained low levels of NF-[kappa]B that were increased substantially after IL-1[beta] stimulation. There was no evidence that CF hTBE cells expressed higher levels of the active p65/p50 heterodimer (upper band) than non-CF hTBE cells, either before or after stimulation. The unlabeled NF-[kappa]B consensus but not the mutant oligonucleotide competed binding with the labeled oligonucleotide, demonstrating the specificity for NF-[kappa]B, and antibodies against p50 and p65 produced the expected supershifts.
Figure 2. Representative tracings and summary data from Ussing chamber studies of Day 6 (A and C) and Day 21 (B and D) hTBE cell cultures. At Day 6, a forskolin (Forsk)-stimulated current was present in all six of the non-CF cultures but was absent from all CF cultures, whereas both cell types responded to uridine 5''-triphosphate (UTP). At Day 21, a greater proportion of the baseline I^sub sc^ was amiloride (Amil) sensitive in CF cells, and a forskolin response was present only in non-CF cells, whereas both cell types responded to UTP. In C, n = 6, except for the UTP bars, where n = 2 and 1 for CF and normal subjects, respectively. In D, n = 5 and 4 for CF and normal subjects, respectively, except for the UTP bars, where n = 3 and 4 for CF and normal subjects, respectively. I^sub sc^ = short-circuit current.
Cytokine Production in Response to Exogenous Stimuli
Because airway infection is a hallmark of CF, we performed experiments in which hTBE cells were exposed to soluble products from relevant bacterial pathogens. To model in vivo exposure, we added sterile filtrates of late stationary phase S. aureus or P. aeruginosa cultures, or similarly treated bacterial growth medium (trypticase soy broth) as the control, to the apical surface of polarized cells. Doses were chosen based on preliminary studies showing lack of overt toxicity of S. aureus and P. aeruginosa filtrates up to 10% and 20%, respectively, as indicated by maintenance of a patent ALI. S. aureus filtrates appeared more damaging to the cultures as manifest by fluid leak upon 48-hour exposure to the 20% dose. The S. aureus filtrates caused modest dose-dependent cellular cytotoxicity, as measured by LDH release, and non-CF cells seemed more susceptible (see Figure E1 in the online supplement). Forty-eight-hour treatment with P. aeruginosa filtrate, at any tested dose up to 20%, did not cause LDH release over control values. Thus, 10% S. aureus or 20% P. aeruginosa doses were chosen for most subsequent experiments. During a 24-hour exposure, 10% S. aureus or 20% P. aeruginosa filtrate both induced an approximately fourfold increase in IL-8 secretion (Table 3). There were no statistically significant differences between non-CF and CF cells (Table 3, experiment 3.1). Human serum, as a source of LPS binding protein and soluble CD14, greatly enhances the response of human monocytes to the TLR-4 agonist LPS (33). Culture filtrates from the Gram-negative organism P. aeruginosa likely contain LPS among other active components. Therefore, we stimulated well differentiated hTBE cell cultures from seven non-CF or seven CF individuals with P. aeruginosa filtrates or the bacterial medium control (trypticase soy broth) in the presence of 10% human serum (Table 3, experiment 3.2). Human serum alone increased IL-8 levels (compare Table 3, experiments 3.1 and 3.2), but there was still an approximately fourfold increase after P. aeruginosa exposure.作者: tieshazhang 时间: 2012-9-27 10:57
TABLE 2. BASAL ELECTROPHYSIOLOGIC CHARACTERISTICS OF NONCYSTIC FIBROSIS AND CYSTIC FIBROSIS CELLS MEASURED IN USSING CHAMBERS AS DESCRIBED
Figure 3. Box plot representation of interleukin (IL)-8 (A) and IL-6 ( production by Day 21 hTBE cells as measured by ELISA. Basal medium was sampled before and after a 17-hour IL-1[beta] exposure. Sham treatment was performed with phosphate-buffered saline (PBS) instead of PBS plus IL-1[beta]. The top, middle, and bottom lines of the boxes correspond to the 75th, 50th, and 25th percentiles, and the whiskers are the 90th and 10th percentiles. The filled rectangle is the arithmetic mean. Triplicate wells were used, and each sample was assayed in duplicate (n = cells from six different individuals). After log transformation to achieve normality, analysis of variance indicated that the differences between non-CF and CF cells were not significant.
Figure 4. Nuclear factor-[kappa]B (NF-[kappa] electrophoretic mobility shift assay. Nuclear extracts were prepared from well differentiated non-CF and CF cells with or without IL-1[beta] stimulation. Each lane originated from an equal amount of nuclear protein extract. The bands were specific for NF-[kappa]B, as demonstrated by competition with nonradioactive consensus NF-[kappa]B oligomer and the lack of competition by a mutant consensus sequence. Antibodies specific to p50 and p65 NF-[kappa]B subunits resulted in a supershift. Both CF and non-CF cells exhibited low basal levels of nuclear NF-[kappa]B. After stimulation with IL-1[beta], both CF and non-CF cells shifted NF-[kappa]B to the nucleus, and the predominant band was composed of p50/p65 heterodimers.
In this experiment, there was great variability in the range of both baseline values and fold increases, and there were no significant differences between non-CF and CF cells. The bacterial supernatants contain a mixture of compounds that can activate cells through TLRs and other mechanisms. Because our previous mRNA analysis indicated that hTBE cells express TLR-2 (32), we also exposed the cells to the synthetic TLR-2 agonist Pam3Cys. To accommodate a more extensive comparison between CF and non-CF cultures (n = 11 each), we chose the inactive OH3Cys analogue as the control rather than media alone. IL-H levels in the OH3Cys-treated cells were higher than in previous control cultures. Nevertheless, hTBE cells responded specifically to Pam3Cys with robust IL-8 production, and the difference between non-CF and CF cells was insignificant (Table 3, experiment 3.3).
TABLE 3. INTERLEUKIN-8 SECRETION (ng/ml OR AVERAGE FOLD INCREASE AS INDICATED) IN RESPONSE TO BACTERIAL PRODUCTS OR A SYNTHETIC TOLL-LIKE RECEPTOR 2 AGONIST
Secretion of IL-6 in response to bacterial supernatants was examined in the absence or presence of human serum (Table 4, experiments 4.1 or 4.2, respectively). In accordance with the IL-8 data, human serum alone increased IL-6 secretion, and P. aeruginosa or S. aureus filtrates further increased IL-6 secretion at least threefold under all conditions. Interestingly, secretion of IL-6 in the trypticase soy broth control was substantially lower in the CF groups, resulting in a greater fold increase in IL-6 in CF cells. However, because of variability between donors, the difference between CF and non-CF cultures was not significant.
Cytokine Production in Poorly Differentiated hTBE Cells in Response to Endogenous and Exogenous Stimuli
Because many previously reported studies involving non-CF versus CF cytokine production were performed using poorly differentiated cells or cell lines, we determined whether differences were detectable in primary cells before they assumed a mucociliary phenotype. For this purpose, hTBE cells were cultured on plastic until confluence and then exposed to media alone, the endogenous cytokines IL-1[beta], TNF-[alpha], or the synthetic TLR-2 agonist Pam3Cys and its control, OH3-Cys. As indicated in Figure 5, there were no statistically significant differences in IL-8 production between poorly differentiated non-CF and CF cells.
Dose- and Time-dependent IL-8 Production in Well Differentiated CF and non-CF hTBE Cultures作者: tieshazhang 时间: 2012-9-27 10:57
A study comparing CFTR-deficient with CFTR-sufficient cell lines indicated that hyperinflammatory responses in CF cells became more apparent on prolonged stimulation (15). Because our previous studies might have missed dose- and/or time-dependent differences between non-CF and CF cells, we stimulated well differentiated hTBE cultures with varying concentrations of bacterial filtrates, sampling the basolateral medium at 8, 24, and 48 hours. IL-8 secretion is presented as fold increase over the trypticase soy broth control at 8 hours (Figure 6). S. aureus treatment was performed in the absence of human serum, and P. aeruginosa challenges were performed in both the absence and presence of 10% human serum. Control IL-8 secretion was not different between non-CF and CF cultures, and similar increases were observed over time (note the different scales at 8, 24, and 48 hours in Figure 6). Except for the 20% group at 8 hours, S. aureus filtrates elicited similar IL-8 secretion in nonCF and CF cells at all time points; 20% P. aeruginosa filtrate in the absence of serum stimulated 10- to 20-fold increases in IL-8 at 24 and 48 hours, respectively, and there were no statistically significant differences between non-CF and CF cells. In contrast, when P. aeruginosa was added in the presence of human serum, in this experiment, IL-8 secretion by CF cells was significantly greater at all time points. The differences became most apparent at the 48-hour time point where only modest increases in IL-8 over control values were seen in non-CF cells, compared with a doubling at the higher P. aeruginosa doses in CF cells. Because cell proliferation during 48 hours of culture may differ between non-CF and CF cells, we measured the DNA at the end of the 48-hour exposure and normalized IL-8 levels for DNA content (Figure 7). Again, CF versus non-CF differences were not significantly different, except for P. aeruginosa stimulation in the presence of human serum. Thus, normalization for DNA content did not alter the results.
TABLE 4. INTERLEUKIN-6 SECRETION (PG/ML OR AVERAGE FOLD INCREASE AS INDICATED) IN RESPONSE TO BACTERIAL PRODUCTS
DISCUSSION
Evidence for excessive neutrophil dominated inflammation in bronchial lavage fluid from CF patients when compared with non-CF individuals has been documented (6-8), but the cause is not clear. In vitro studies performed with nasal or bronchial epithelial cells from CF or non-CF individuals or with immortalized cell lines in which CFTR status has been manipulated give conflicting results, ranging from increased NF-[kappa]B activation and production of IL-8 to no changes or even decreased levels of inflammatory cytokines (14-17, 22-27). Thus, it is controversial whether excessive pulmonary inflammation is an intrinsic property of the CFTR defect or whether it is secondary to the unique environment of the CF lung.
Figure 5. IL-8 production by poorly differentiated hTBE cultured on plastic. hTBE cells were treated with media alone, stimulated as described with OH3Cys (inactive analogue of Pam3Cys, 25 µg/ml), Pam3Cys (25 µg/ml), tumor necrosis factor-[alpha] (TNF-[alpha]) (25 ng/ml), or IL-1[beta] (10 ng/ml) for 24 hours when supernatants were collected for IL-8 quantitation by ELISA. The data are means ± SEM from triplicate wells of cells derived from 11 different non-CF and CF lungs. Statistically significant differences between non-CF and CF groups were not present as indicated by analysis of variance.
Our studies focused on primary airway epithelial cells. The culture methods employed included an expansion to a second passage. Samples from a total of 33 non-CF and 25 CF lungs were available for comparison. When cultured at an ALI until well differentiated, the cells mimicked many features (polarity, I^sub sc^, cAMP-sensitive Cl conductance, fluid absorption, mucus transport) expected of normal and CF airway epithelium (Figure 1) (1). Unlike transfected cell lines, these passage 2 hTBE cells are likely to express physiologically relevant numbers of mutant and normal CFTR channels, as manifested by their electrophysiologic properties. Under these conditions, there was no evidence that CF-derived cells contained more activated NF-[kappa]B or secreted more IL-8 than non-CF cells, either in their basal state or when stimulated with IL-1[beta]. IL-10 or RANTES was not detectable in these cultures. IL-6 production in CF cells stimulated with IL-1[beta] was somewhat greater than in non-CF cells, but the difference was not statistically significant.
Airway epithelial cells express m RN A for many of the TLRs, including TLR-1, TLR-2, TLR-3, TLR-4, TLR-5, and TLR-6 (32). The bacterial products used in our studies likely stimulate hTBE cells through these receptors, activating characteristic downstream signal transduction pathways. In the absence of human serum, neither S. aureus or P. aeruginosa filtrates (with exception of the 20% S. aureus dose at 8 hours) nor a synthetic TLR-2 agonist revealed any differences in IL-8 or IL-6 secretion in well-differentiated hTBE derived from non-CF or CF lungs. The lack of differential sensitivity to relevant proinflammatory agents was not a result of prolonged culture to achieve a mucociliary phenotype, as poorly differentiated cells on plastic did not show differences in cytokine- or TLR-2 agonist-stimulated IL-8 secretion due to CFTR status.作者: tieshazhang 时间: 2012-9-27 10:58
Interestingly, when hTBE cultures were exposed to P. aeruginosa filtrate in the presence of human serum, significant differences sometimes became apparent between non-CF and CF cells. IL-8 secretion by both cell types continued to increase over time. CF cells demonstrated continuous dose responsiveness to P. aeruginosa filtrate, whereas the stimulatory effects of P. aeruginosa on non-CF cells seemed to wane, especially at the 48-hour time point. An initial experiment failed to reveal significant differences between CF and non-CF hTBE cells to P. aeruginosa filtrates at 24 hours even when human serum was present (Table 4). It is possible that variability between donors, including coincidentally clustered hyperresponders in the non-CF group, masked any differences in this particular experiment. Non-CF versus CF differences may have become apparent if this initial experiment was extended to 48 hours. However, there was a clear increase in P. aeruginosa-stimulaled IL-8 production by CF cells in the presence of human scrum in a second experiment. Overall, our data indicate that inflammatory responses of non-CF and CF cells are not globally different but that exaggerated responses may develop in CF cells under specific conditions. The significant differences in our experiments were never greater than 2.5-fold. CF cells may be more sensitive to synergism between serum and P. aeruginosa-derived factors, and it is possible that when multiple proinflammatory pathways are activated, non-CF cells are more capable of limiting their responsiveness than CF cells. As the studies presented here were under review, data were published comparing intercellular adhesion molecule-1 upregulation or IL-8 secretion in response to TNF-[alpha], IL-1[beta], killed whole Haemophilus influenzae or P. aeruginosa in primary hTBE cells from eight non-CF and eight CF donors (34). These studies support our findings that differences between non-CF and CF cells are apparent only under specific conditions and that donor-to-donor variability complicates their detection.
Figure 6. IL-8 production by well differentiated non-CF and CF hTBE cells. Time course and dose response to 5. aureus (S. a.) or P. aeruginosa (Ps. a.) in the absence of human serum (top) or P. aeruginosa in the presence of 10% human serum (bottom). ALI hTBE cell cultures were apically challenged with the indicated concentrations of bacterial filtrates. IL-8 in the basolateral media was measured by ELISA at 8, 24, or 48 hours. All data are presented as the means ± SEM of fold increases over the corresponding control value (0% bacterial filtrate, 20% trypticase soy broth) at 8 hours. Absolute levels are indicated on the 8-hour panels, n = 8 for the non-CF group and 9 for the CF group except for the 2.5% and 20% doses of 5. aureus, the 20% P. aeruginosa dose without serum, and the 2.5% and 10% dose of P. aeruginosa with serum where n = 4 and 5 for non-CF and CF, respectively. Differences between non-CF and CF groups were determined by analysis of variance and Tukey's-post hoc test and are denoted by *p < 0.05 or **p < 0.01, respectively.
Figure 7. IL-8 production in well differentiated non-CF and CF hTBE cells after normalization for DNA content per culture well. ALI hTBE cell cultures were apically challenged with 10% S, aureus or P. aeruginosa in the absence of human serum or 20% P. aeruginosa in the presence of 10% human serum as indicated. IL-8 in the basolateral medium and DNA in the cell layer was measured by ELISA and a fluorescence-based kit, respectively, n = 8 for the non-CF group and 9 for the CF group except for P. aeruginosa without serum where n = 4 and 5, respectively. Statistically significant differences between non-CF and CF groups were determined by analysis of variance and Tukey's post hoc test and are denoted **p < 0.01.
It is important to note that all in vitro cell culture systems are only an approximation of the actual in vivo physiologic state. The electrophysiologic properties of the CF epithelium in vivo include a higher baseline potential difference thought to represent hyperactivity of epithelial sodium channels and higher I^sub sc^ responses to calcium mobilizing agonists such as uridine 5'-triphosphate (35, 36). Although the non-CF and CF passage 2 cultures we studied were absolutely faithful to their genotype regarding the absence or presence of cAMP stimulated currents, the CF cells did not exhibit higher baseline potential differences or exaggerated uridine 5'-triphosphate responses. One could argue that the intrinsic hyperinOammatory defect is linked to the sodium channel and calcium-activated chloride channel abnormalities. In vitro cultures displaying hyperactivity of sodium and calcium activated chloride channels will be necessary to resolve this question.
Studies using cell lines offer the attractive feature of manipulating CFTR status on an isogenic background. The exact cause for paradoxical results between the many reports using different paired CF and non-CF cell lines is unknown. In the recently published study of Aldallal and colleagues (34), significant differences in IL-8 secretion ascribed to CFTR correction could be demonstrated in one but not another set of paired cell lines. The differences may relate to altered gene expression patterns or changes in signal transduction pathways induced during the generation of the specific cell lines. Many cell lines are unstable and ancuploid because of the action of the transforming oncogenes used in their creation. In many cases, cell lines may be separated by many passages and may have accumulated differences other than CFTR status.
In summary, IL-8 secretion and NF-[kappa]B activation, at baseline or in response to a diverse set of relevant stimuli, were generally similar in a representative sample of passaged primary CF and non-CF hTBE cells that morphologically and physiologically reproduce many features of the in vivo bronchial epithelium. Only under certain conditions, such as P. aeruginosa in the presence bul not in the absence of serum, was there an exaggerated and sustained but somewhat variable IL-8 response in CF cells. Our results suggest that intrinsic baseline differences in inflammation due to mutant CFTR per se are not a primary cause for the hyperinflammatory status of the CF lung. More likely, severe inflammation occurs in response to bacteria, their products, and host factors that accumulate in the unique environment created by defective mucociliary clearance in the CF lung. Under these circumstances, it is possible that CF cells are less capable of downregulating proinflammatory responses.作者: tieshazhang 时间: 2012-9-27 10:58
Conflict of Interest Statement: M.N.B. has no declared conflict of interest; M.S.S. has no declared conflict of interest; M.S.M. has no declared conflict of interest; A.J.H. has no declared conflict of interest; Q.W. has no declared conflict of interest; M.W.V. has no declared conflict of interest; S.H.R. serves as a consultant for Vertex Pharmaceuticals and has received a speaking fee for work not related to the subject of this manuscript.
Acknowledgment: The authors thank the Tissue Procurement/Cell Culture and Histology Cores of the University of North Carolina CF/Pulmonary Research and Treatment Center for excellent service. They also thank Dr. Harry Hurd of the University of North Carolina Department of Statistics for expert consultation.
[参考]
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[作者单位]
Marie N. Becker, Mariam S. Sauer, Marianne S. Muhlebach, Andrew J. Hirsh, Qi Wu, Margrith W. Verghese, and Scott H. Randell
Cystic Fibrosis/Pulmonary Research and Treatment Center, Department of Medicine; Department of Cellular and Molecular Physiology; and Department of Pediatrics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
[作者单位]
(Received in original form July 29, 2002; accepted in final form December 9, 2003)
Supported by the Cystic Fibrosis Foundation and National Institutes of Health grants HL58345, HL 60280, and HL 51818.
Correspondence and requests for reprints should be addressed to Scott H. Randell, Ph.D., UNC CF Center, CB 7248, 4011 Thurston-Bowles, Chapel Hill, NC 27599. E-mail: randell@med.unc.edu
This article has an online supplement, which is accessible from this issue's table of contents online at cuturl('www.atsjournals.org')
Am J Respir Crit Care Med Vol 169. pp 645-653, 2004
Originally Published in Press as DOI: 10.1164/rccm.200207-765OC on December 11, 2003
Internet address: cuturl('www.atsjournals.org') 作者: bling 时间: 2012-9-27 10:59
MONOCLONAL ANTIBODY STAINING PROCEDURE
I. SAMPLE – one or more of the following preparations
A. Suspension of single cells from tissue (e.g., lymph node, spleen, bone marrow, placental cells)
B. Tissue culture cells
C. Ficoll – hypaque separated mononuclear cells
II. REAGENTS
A. Antibodies
1. Primary antibodies: usually purchased or your own monoclonals
a. if these are conjugated with a fluorochrome (e.g., FITC or PE) use the DIRECT STAINING PROCEDURE
b. if the primary antibody is not conjugated to a fluorochrome, use the INDIRECT STAINING PROCEDURE
2. Secondary antibodies: fluoresceinated polyclonal antibodies
B. BUFFER: Phosphate-buffered saline (PBS Ca 2+ and Mg2+ free) + 2 % newborn calf serum (or 0.2% BSA) + 0.1% sodium azide.
C. Formaldehyde preservative: 2% solution in protein-free PBS
D. PBS: protein and azide free
Buffer and formaldehyde solution can be provided by the FLOW CYTOMETRY CORE LAB if they are not routinely used by the investigator.
III. TUBES
A. Use appropriate 12 x 75 mm polystyrene/polypropylene tubes. Please note that Falcon snap-cap tubes are the only ones that fit on the Becton Dickinson flow cytometer for certain. If you want to stain in another tube type, please transfer the cells finally to those specified here.
B. Mark all tubes with easily readable numbers which correspond to your protocol sheet (see below).
C. Use 1% formaldehyde solution for re-suspension of all potentially biohazardous specimens and cap them.
IV. PROTOCOL
A. Obtain protocol sheets from the FLOW CYTOMETRY CORE LAB (sample attached – please Xerox)
B. Fill out a sheet each time you do an experiment. Include all of the information requested.
SINGLE COLOR PROTOCOL SHEET (Excel required)
DUAL COLOR PROTOCOL SHEET (Excel required)
DIRECT STAINING PROCEDURE
1. Prepare your cells as a suspension of single cells in a manner appropriate for the specimen you wish to examine. Make sure the cells are viable. As the final step, wash at least once with 1 ml of cold BUFFER. Resuspend the cells at 107 cells/ml (thus 50 microliters = 5 x 105 cells) in cold BUFFER.
2. Meanwhile add 50 microliters of BUFFER and then the appropriate amount of monoclonal antibody to the bottom of tubes. Note: For multi-color staining, add all your fluorochrome-conjugated antibodies at the same time.作者: c86v 时间: 2012-9-27 11:59
3. Add 50 microliters of the cell suspension to the bottom of the tubes.
4. Vortex briefly and incubate 30 minutes at 4° C in the dark.
5. Wash twice with 1 ml of buffer; centrifuge at 250g for 5 minutes.
6. Resuspend samples in 1 ml of buffer and hold at 4°C in the refrigerator (or on ice) prior to analysis.
INDIRECT STAINING PROCEDURE
1-5. Process cell samples as above using a working dilution of unlabelled monoclonal antibody.
6. Resuspend cell pellet in 100 microliters of working dilution of the fluoresceinated second antibody.
7. Vortex briefly and incubate for 20 minutes in the refrigerator.
8. Wash twice with ~ 1 ml of buffer; centrifuge at 250g for 5 minutes.
9. Resuspend samples in 1 ml of buffer and hold at 4°C in refrigerator (or on ice) protected from light prior to analysis.
NOTE: If your samples are Ficoll-Hypaque separated whole blood cells you might still have residual red blood cells in your preparation. These red cells interfere with flow cytometric analysis of lymphocytes and have to be removed by NH4Cl lysis. See attached recipe and procedure.
PRESERVING PROCEDURE
If cells are not going to be read on the flow cytometer the same day, or they are considered potentially biohazardous, do not re-suspend them after the staining procedure. Stop at Step 5 of DIRECT STAINING or at Step 8 of INDIRECT STAINING, and continue as below.
1. Add to the pellet 0.5 ml of cold protein-free PBS, and vortex; then add 0.5 ml of cold formaldehyde solution (see attached recipes).
2. Vortex again and incubate in the refrigerator. Make sure to keep cells in the dark as exposure to light may cause loss of fluorescence.
AMMONIUM CHLORIDE LYSING SOLUTION – 10X
Reagents Amount:
Ammonium Chloride, ACS 82.9 g
Potassium Bicarbonate, USP 10.0 g
Ethylenediamine tetraacetic acid (EDTA) disodium salt 0.37 g
Water, glass distilled qsad 1.0 liter
Adjust pH to 7.2 and keep in tightly closed container at 4°C. To prepare a 1X working solution (to be used at room temperature), dilute 10X 1:10 with glass distilled water. Keep tightly closed and discard at the end of the day.
LYSING PROCEDURE FOR LYSIS OF RESIDUAL RED BLOOD CELLS
IN FICOLL-HYPAQUE SEPARATED MONONUCLEAR CELLS
1. After the staining procedure, take off as much of the washing buffer as possible without disturbing the pellet.
2. Vortex briefly and add 1 ml of room temperature 1X NH4Cl lysing solution to your cells, vortex again and expose your cells to it for 2-3 minutes at room temperature. Note: do not exceed this time.
3. Centrifuge for 5 minutes at 200g. Remove the lysing buffer completely and resuspend in BUFFER or 1% formaldehyde solution for analysis.
PREPARATION OF 2% FORMALDEHYDE STOCK SOLUTION (2 METHODS)
METHOD 1:
Formaldehyde preservative – 2% formaldehyde solution in protein-free phosphate-buffered saline (PBS).
Prepare as follows:
Add 2 g paraformaldehyde powder (e.g., Sigma, St. Louis, MO) to 100 ml of 1 X PBS. Heat to 70°C (do not exceed this temperature) in a fume hood until the paraformaldehyde goes into solution (note that this happens quickly as soon as the suspension reaches 70°C). Allow the solution to cool to room temperature. Adjust to pH 7.4 using 0.1 M NaOH or 0.1 M HCl, if needed. Filter and store at 4°C protected from light.
METHOD 2:
Formaldehyde preservative – 2% formaldehyde solution in protein-free PBS.
Prepare as follows:
10% formaldehyde* 20 ml
10 x PBS 10 ml
Distilled water 70 ml
* 10% formaldehyde solution (e.g., Polysciences, Warrington, PA, Ultrapure, Cat.#04018), depolymerized paraformaldehyde, EM grade, methanol-free solution.作者: u234 时间: 2012-9-27 12:00
紧急求助:
课题需要一篇原文,有哪位同道帮帮忙?
Oda D,Savard CE, Eng L, et al. Reconstituted human oral and esophageal mucosa in culture.[J] In Vitro Cell Dev Biol Anim, 1998,34(1):46-52
万分感谢!
请发到我的邮箱:hx1990@163.com作者: ALALA 时间: 2012-9-27 12:22
To culture neurostem cells, the most popular medium is DMEM/F12 medium plus B27 supplement. You also need to supply basic FGF and EGF at concentration of 10 -20 ug/ml in culture. DMEM/F12 medium can be purchased from Gibco and FGF and EGF can be purchased from Sigma. There are two kind of neurostem cells cultures, attached and suspension (neurospheres), the later is more popular. When you culture neurosphere, it is better to add growth factors (FGF and EGF) every day at a half dose. This will keep ralatively constant growth factor concentration in culture. There are two ways to subculture neurospheres, mechnically trituration and enzyme method. The enzyme method is more gently and effective. Some labs use enzyme cocktail for neurosphere subcultur; others use papain for digestion. Both emzyme method works well. 作者: ending 时间: 2012-9-28 11:51
What is the source of your astrocyte culture, human or rat? If you are using rat, try neonate day 2 brain as the source. I have been using day 2 brain astrocyte for a while and never have the problem. 作者: 33号 时间: 2012-9-28 12:03
What is the source of your astrocyte culture, human or rat? If you are using rat, try neonate day 2 brain as the source. I have been using day 2 brain astrocyte for a while and never have the problem