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:
The American journal of physiology
影响因子:
--
通讯作者:
Putnam,RW
Putnam,RW
中科院分区:
--
文献类型:
--
作者:
Ritucci,NA;Chambers-Kersh,L;Dean,JB;Putnam,RW

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在延髓的两个化学敏感区[孤束核(NTS)和延髓腹外侧区(VLM)]和两个非化学敏感区[舌下神经(Hyp)和下橄榄(IO)]的神经元中研究了细胞内pH(pHi)调节。来自所有区域的神经元的固有缓冲能力(βint)相同(46 mM/pH U)。在所有神经元中Na+/H+交换介导的从酸化的恢复[Ritucci,N.一、J. B. Dean和R. W. Putnam.Am. 273(Regulatory Integrative Comp.Physiol.42):R433-R441,1997]。Cl-/交换介导VLM、Hyp和IO神经元从碱化中恢复,但在大多数NTS神经元中不存在。当细胞外pH <7.0时,NTS和VLM神经元的Na+/H+交换被完全抑制,而Hyp和IO神经元的Na+/H+交换仅在pH <6.7时才被完全抑制。来自VLM的Cl−/交换器,而不是Hyp和IO神经元,被pHoof 7.9抑制。这些pH调节特性导致了较陡的pHi-pHo关系的神经元从化学敏感的区域相比,那些从nonchemosensitive区域。这些差异与作为中枢化学感受最接近信号的pH变化和调节pH变化的pH变化的作用是一致的。
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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