Mitochondria accumulate Ca2+ following intense glutamate stimulation of cultured rat forebrain neurones.
Mitochondria accumulate Ca2+ following intense glutamate stimulation of cultured rat forebrain neurones.
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对培养的大鼠前脑神经元进行强烈的谷氨酸刺激后,线粒体会积累 Ca2+。
DOI:
10.1113/jphysiol.1997.sp021839
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发表时间:
1997
期刊:
影响因子:
--
通讯作者:
Reynolds,IJ
中科院分区:
文献类型:
--
作者:
White,RJ;Reynolds,IJ
1. In cultures of rat forebrain neurones, mitochondria buffer glutamate‐induced, NMDA receptor‐mediated Ca2+ influx. Here, we have used the fluorescent calcium indicator, indo‐1 AM to record [Ca2+]i from single cells. We varied either the glutamate concentration or the duration of exposure to investigate the cellular mechanisms recruited to buffer [Ca2+]i within different stimulation protocols. 2. For a 15 s stimulus, the recovery time doubled as the glutamate concentration was raised from 3 to 300 microM. Changing the duration of exposure from 15 s to 5 min increased the recovery time tenfold even when the glutamate concentration was held at 3 microM. 3. We used a selective inhibitor of the mitochondrial Na(+)‐Ca2+ exchange, CGP‐37157. When applied immediately after a 15 s, 100 microM glutamate challenge, CGP‐37157 consistently caused a rapid fall in [Ca2+]i followed by a slow rise after the drug was washed out. A similar pattern was seen with the 5 min, 3 microM glutamate stimulus. The effects of CGP‐37157 are consistent with the release of substantial mitochondrial Ca2+ stores during recovery from an intense glutamate stimulus. 4. These studies suggest that mitochondria become progressively more important for buffering glutamate‐induced Ca2+ loads as the stimulus intensity increases. The recovery of [Ca2+]i to baseline following glutamate removal is critically regulated by the release of Ca2+ from mitochondrial stores via mitochondrial Na(+)‐Ca2+ exchange. The data highlight a previously under‐appreciated role for [Na+]i in the regulation of [Ca2+]i in central neurones.
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影响因子:
4
作者:
M. Wahl;M. Lucherini;E. Gruenstein
通讯作者:
E. Gruenstein
DOI:
--
发表时间:
1985-03
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
G. Grynkiewicz;M. Poenie;Roger Y. TsienB
通讯作者:
G. Grynkiewicz;M. Poenie;Roger Y. TsienB
影响因子:
3.9
作者:
J. Satrústegui;C. Richter
通讯作者:
C. Richter
影响因子:
16.2
作者:
CHENG, B;MATTSON, MP
通讯作者:
MATTSON, MP
DOI:
--
发表时间:
1995
期刊:
Molecular pharmacology.
影响因子:
--
作者:
Kiedrowski,L;Costa,E
通讯作者:
Costa,E