NMT历史上的今天丨Ca2+流指示的微藻氮胁迫信号转导研究

NMT是基因功能的活体检测技术，已被103位诺贝尔奖得主所在单位，及北大、清华、中科院使用。

NMT历史上的今天

2014年01月14日，中科院水生所王强、陈辉用NMT在Plant and Cell Physiology上发表了标题为Ca2+ Signal Transduction Related to Neutral Lipid Synthesis in an Oil-Producing Green Alga Chlorella sp. C2的研究成果。'

期刊：Plant and Cell Physiology
主题：Ca2+流指示的微藻氮胁迫信号转导研究

标题：Ca2+ Signal Transduction Related to Neutral Lipid Synthesis in an Oil-Producing Green Alga Chlorella sp. C2

影响因子：4.134

检测指标：Ca2+流速

作者：中科院水生所王强、陈辉

英文摘要

Changes in the cytosolic Ca2+ levels and the role of Ca2+ signal transduction in neutral lipid synthesis in Chlorella sp. C2  under nitrogen starvation conditions were investigated. The results   detected by using the scanning ion-selective electrode technique   demonstrate that nitrogen starvation induced significant Ca2+ influx   across the plasma membrane into cells.

Ca2+ fluorescence imaging  and flow cytometry were used to estimate the effect of this Ca2+ influx  on the generation of the Ca2+ signal, and the results showed that the  cytosolic Ca2+ concentration increased transiently and then remained at a  stable, high level when the cells were exposed to nitrogen starvation.  However, the increase could be inhibited by pre-treatment with the Ca2+  channel blockers ruthenium red, verapamil and GdCl3, indicating that  both the influx of Ca2+ from the extracellular space via Ca2+ channels  that are localized in the plasma membrane and the release of Ca2+ from  intracellular calcium storage via the internal calcium store were  required for the generation and transduction of the Ca2+ signal.

During  nitrogen starvation, neutral lipid synthesis in Chlorella sp. C2 in  response to stress conditions was also inhibited to differing degrees by  pre-treatment with the three Ca2+ channel blockers, demonstrating the  regulation of Ca2+ via these Ca2+ channels in neutral lipid synthesis.

The  results suggested that by transduction of extracellular stress signals  into the cell and the regulation of the Ca2+ signal in neutral lipid  synthesis, Ca2+ signal transduction played important roles in the  response mechanism of Chlorella sp. C2 to nitrogen starvation.

中文摘要（谷歌机翻）

小球藻中胞质Ca2+水平的变化以及Ca2+信号转导在中性脂质合成中的作用。研究了氮饥饿条件下的C2。通过使用扫描离子选择电极技术检测到的结果表明，氮饥饿导致大量Ca2+穿过质膜流入细胞。

Ca2+荧光成像和流式细胞仪用于评估这种Ca2+内流对Ca2+信号生成的影响，结果表明，当细胞暴露于细胞中时，胞浆中Ca2+的浓度会瞬时增加，然后保持稳定的高水平。氮饥饿。但是，通过用Ca2+通道阻滞剂钌红，维拉帕米和GdCl3进行预处理可以抑制这种增加，这表明Ca2+经由位于质膜上的Ca2+通道从细胞外空间大量涌入以及Ca2+的释放。Ca2+信号的产生和转导需要通过内部钙储存器进行细胞内钙储存。

在氮饥饿期间，小球藻中的中性脂质合成。通过使用三种Ca2+通道阻滞剂的预处理，C2对应激条件的响应也受到了不同程度的抑制，这表明在中性脂质合成中通过这些Ca2+通道对Ca2+的调节。

结果表明，通过将细胞外应激信号转导到细胞中以及中性脂质合成中Ca2+信号的调节，Ca2+信号转导在小球藻的反应机制中发挥了重要作用。C2导致氮饥饿。

Fig. 1 The total Ca2+ ?ux rates over 5 min in   Chlorella sp. C2 under N starvation. (a) Microphotographic examples of   Ca2+ ion ?ux/voltage-clamp measurements. (b) Total ?ux rates of  Ca2+ were detected at 0, 0.5, 2 and 8 d after N starvation. The columns   represent the means of three replicated studies in each sample, with the  SD of the means (t-test, P < 0.05). The signi?cance of the   differences between the control (0 d) and other test values was tested   using a one-way analysis of variance. *P < 0.05 vs. control.