Cell volume control in vestibular dark cells during and after a hyposmotic challenge.

Cell volume control in vestibular dark cells during and after a hyposmotic challenge.
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低渗挑战期间和之后前庭暗细胞的细胞体积控制。

DOI:
10.1152/ajpcell.1994.266.4.c1046
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发表时间:
1994
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Shiga,N
Shiga,N
中科院分区:
--
文献类型:
--
作者:
Wangemann,P;Shiga,N

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在前庭暗细胞的制备中,细胞高度被测量为体积指数,其中灌注液可以进入上皮的两侧。在去除75 mM NaCl诱导的低渗挑战下,细胞高度增加到107%;然而,细胞宽度没有增加。在没有Cl-或K+的情况下,或者在有乌巴因、利多卡因、钡或奎尼丁的情况下,在7℃下,或者用戊二醛固定后,观察到细胞高度的显著增加。然而,在缺乏Na+或存在布美他尼或乙氧基唑胺的低渗挑战期间,没有观察到明显不同的肿胀。随后恢复到控制渗透压引起依赖于Na+, Cl-和K+的调节性体积增加,被布美他尼,瓦巴因或7℃抑制,但不被乙氧基唑胺,钡,奎尼丁或利多卡因抑制。这些数据表明,在低渗挑战过程中,细胞体积的控制涉及一个依赖于细胞质KCl和Na(+)- k (+)- atp酶的机制,Na(+)- cl (-)- k +共转运体参与了调节体积的增加。
Cell height was measured as an index of volume in a preparation of vestibular dark cells in which the perfusate had access to both sides of the epithelium. In response to a hyposmotic challenge induced by removal of 75 mM NaCl, cell height increased to 107%; however, cell width did not increase. Significantly larger increases in cell height were observed in the absence of Cl- or K+ or in the presence of ouabain, lidocaine, barium, or quinidine, at 7 degrees C, or after fixation with glutaraldehyde. However, no significantly different swelling was observed during a hyposmotic challenge in the absence of Na+ or in the presence of bumetanide or ethoxyzolamide. Subsequent return to control osmolarity caused a regulatory volume increase that was dependent on Na+, Cl-, and K+, inhibited by bumetanide, ouabain, or 7 degrees C, however not inhibited by ethoxyzolamide, barium, quinidine, or lidocaine. The data suggest that cell volume control during the hyposmotic challenge involved a mechanism dependent on cytosolic KCl and the Na(+)-K(+)-ATPase and that the Na(+)-Cl(-)-K+ cotransporter was involved in regulatory volume increase.
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