Secretory modulation of basolateral membrane inwardly rectified K(+) channel in guinea pig distal colonic crypts.
Secretory modulation of basolateral membrane inwardly rectified K(+) channel in guinea pig distal colonic crypts.
复制标题
豚鼠远端结肠隐窝基底外侧膜向内整流 K( ) 通道的分泌调节。
DOI:
10.1152/ajpcell.00065.2001
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发表时间:
2002
期刊:
影响因子:
--
通讯作者:
Halm,DanR
中科院分区:
文献类型:
--
作者:
Li,Yingjun;Halm,DanR
Cell-attached recordings revealed K+channel activity in basolateral membranes of guinea pig distal colonic crypts. Inwardly rectified currents were apparent with a pipette solution containing 140 mM K+. Single-channel conductance (γ) was 9 pS at the resting membrane potential. Another inward rectifier with γ of 19 pS was observed occasionally. At a holding potential of −80 mV, γ was 21 and 41 pS, respectively. Identity as K+channels was confirmed after patch excision by changing the bath ion composition. From reversal potentials, relative permeability of Na+over K+(PNa/PK) was 0.02 ± 0.02, withPRb/PK= 1.1 andPCl/PK< 0.03. Spontaneous open probability (Po) of the 9-pS inward rectifier (gpKir) was voltage independent in cell-attached patches. Both a low (Po= 0.09 ± 0.01) and a moderate (Po= 0.41 ± 0.01) activity mode were observed. Excision movedgpKirto the medium activity mode;PoofgpKirwas independent of bath Ca2+activity and bath acidification. Addition of Cl−and K+secretagogues alteredPoofgpKir. Forskolin or carbachol (10 μM) activated the small-conductancegpKirin quiescent patches and increasedPoin low-activity patches. K+secretagogues, either epinephrine (5 μM) or prostaglandin E2(100 nM), decreasedPoofgpKirin active patches. ThisgpKirmay be involved in electrogenic secretion of Cl−and K+across the colonic epithelium, which requires a large basolateral membrane K+conductance during maximal Cl−secretion and, presumably, a lower K+conductance during primary electrogenic K+secretion.
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DOI:
10.1007/bf00704154
发表时间:
1995
期刊:
Pflügers Archiv
影响因子:
--
作者:
E. Lohrmann;R. Greger
通讯作者:
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DOI:
10.1152/ajpcell.1999.277.3.c501
发表时间:
1999-09-01
影响因子:
5.5
作者:
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通讯作者:
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发表时间:
1997
期刊:
The American journal of physiology.
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
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期刊:
The American journal of physiology
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
1994
期刊:
The Journal of Membrane Biology
影响因子:
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作者:
J. Tabcharani;R. Harris;A. Boucher;J. W. Eng;J. Hanrahan
通讯作者:
J. Hanrahan