Intracellular pH regulation in neurons from chemosensitive and nonchemosensitive areas of the medulla.
Intracellular pH regulation in neurons from chemosensitive and nonchemosensitive areas of the medulla.
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髓质化学敏感和非化学敏感区域神经元的细胞内 pH 调节。
DOI:
10.1152/ajpregu.1998.275.4.r1152
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发表时间:
1998
期刊:
影响因子:
--
通讯作者:
Putnam,RW
中科院分区:
文献类型:
--
作者:
Ritucci,NA;Chambers-Kersh,L;Dean,JB;Putnam,RW
Intracellular pH (pHi) regulation was studied in neurons from two chemosensitive [nucleus of the solitary tract (NTS) and ventrolateral medulla (VLM)] and two nonchemosensitive [hypoglossal (Hyp) and inferior olive (IO)] areas of the medulla oblongata. Intrinsic buffering power (βint) was the same in neurons from all regions (46 mM/pH U). Na+/H+exchange mediated recovery from acidification in all neurons [Ritucci, N. A., J. B. Dean, and R. W. Putnam.Am. J. Physiol.273 (Regulatory Integrative Comp. Physiol.42): R433–R441, 1997]. Cl−/exchange mediated recovery from alkalinization in VLM, Hyp, and IO neurons but was absent from most NTS neurons. The Na+/H+exchanger from NTS and VLM neurons was fully inhibited when extracellular pH (pHo) <7.0, whereas the exchanger from Hyp and IO neurons was fully inhibited only when pHo<6.7. The Cl−/exchanger from VLM, but not Hyp and IO neurons, was inhibited by pHoof 7.9. These pH regulatory properties resulted in steeper pHi-pHorelationships in neurons from chemosensitive regions compared with those from nonchemosensitive regions. These differences are consistent with a role for changes of pHias the proximate signal in central chemoreception and changes of pHoin modulating pHichanges.
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DOI:
--
发表时间:
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期刊:
Journal of Physiology
影响因子:
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作者:
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DOI:
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期刊:
影响因子:
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