1. Throw away everything that you used.Including all the medium, FBS, PBS, Trypsin.
Anything that you have opened once in the previously culture, pls throw away. No need test them like culturing them seperately in the incubator.
2. Stop culture 1 week.
3. Thaw new freezed cell in newly prepared reagent.
支原体污染的挽救:
一般情况下最保险的方法将污染的细胞高压后丢弃。若不得不挽救,常用的抗生素如下:(Until now, three groups of agents were shown to be highly active against mycoplasmas: macrolides, tetracyclines, and quinolones)。可以一类和两类合用。作者: 园丁## 时间: 2012-8-31 16:44
支原体属于没有细胞壁的一类特殊的细菌,由于其柔韧性,支原体能通过0.45um的过滤器。支愿体生长比细菌缓慢,需要1~3小时甚至更长。同时支原体生长有一个较长的平台期,因此可能需要1星期才能发现明显的污染现象。大多数mycoplasma帖附在细胞壁上生长,但也有少数能穿透细胞膜进入细胞生长。由于细胞培养过程中P/S的广泛使用,常使支原体污染被抑制而不是完全消灭,这种在显微镜下看不见的污染现象同样是危险的。更可怕的是,支原体在液氮中无需保护也能生存,因此有人将细胞保存在液氮的气相中。
细胞培养过程中支原体污染的来源见下表:
Table2 . Sources of mycoplasma contamination
• Original (primary) tissue isolate (<1%)
• Culture reagents (predominantly fetal bovine serum) 目前较少见
• Laboratory staff 常见(大部分细胞污染的支原体是人的寄生菌)
• Cross-contamination from infected cultures 最常见,实验室中发现的支原体污染常是同一种类
当处理已经被支原体污染的细胞时,操作过程中产生的微小液滴是污染的主要来源。这个难以避免的污染源将污染培养瓶、培养液和环境,从而使其他未受污染的细胞发生交叉污染。其次,研究人员口腔中的支原体飞溅也是重要的污染源。
支原体污染后对细胞的影响非常广泛,细胞生长和大多数实验数据都将受到影响,部分影响由下表列出。
Table 3. Effects of mycoplasma contamination on cell cultures
• General effects on eukaryotic cells:
– Altered levels of protein, RNA and DNA synthesis
– Alteration of cellular metabolism
– Induction of chromosomal aberrations (numerical and structural alterations)
– Change in cell membrane composition (surface antigen and receptor expression)
– Alteration of cellular morphology
– Induction (or inhibition) of lymphocyte activation
– Induction (or suppression) of cytokine expression
– Increase (or decrease) of virus propagation
– Interference with various biochemical and biological assays
– Influence on signal transduction
– Promotion of cellular transformation
– Alteration of proliferation characteristics (growth, viability)
– Total culture degeneration and loss
支原体污染的常见表型有:细胞生长变慢、细胞活力下降、贴壁细胞漂起、出现许多黑色小颗粒。作者: 园丁## 时间: 2012-8-31 16:44