Distinct kinases are involved in contraction of cat esophageal and lower esophageal sphincter smooth muscles.
Distinct kinases are involved in contraction of cat esophageal and lower esophageal sphincter smooth muscles.
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不同的激酶参与猫食管和下食管括约肌平滑肌的收缩。
DOI:
10.1152/ajpcell.00390.2003
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发表时间:
2004
期刊:
影响因子:
--
通讯作者:
Biancani,Piero
中科院分区:
文献类型:
--
作者:
Kim,Nayoung;Cao,Weibiao;Song,InSung;Kim,ChungYong;Harnett,KarenM;Cheng,Ling;Walsh,MichaelP;Biancani,Piero
Contraction of smooth muscle depends on the balance of myosin light chain kinase (MLCK) and myosin light chain phosphatase (MLCP) activities. Because MLCK activation depends on the activation of calmodulin, which requires a high Ca2+concentration, phosphatase inhibition has been invoked to explain contraction at low cytosolic Ca2+levels. The link between activation of the Ca2+-independent protein kinase Cε (PKCε) and MLC phosphorylation observed in the esophagus (ESO) (Sohn UD, Cao W, Tang DC, Stull JT, Haeberle JR, Wang CLA, Harnett KM, Behar J, and Biancani P.Am J Physiol Gastrointest Liver Physiol281: G467–G478, 2001), however, has not been elucidated. We used phosphatase and kinase inhibitors and antibodies to signaling enzymes in combination with intact and saponin-permeabilized isolated smooth muscle cells from ESO and lower esophageal sphincter (LES) to examine PKCε-dependent, Ca2+-independent signaling in ESO. The phosphatase inhibitors okadaic acid and microcystin-LR, as well as an antibody to the catalytic subunit of type 1 protein serine/threonine phosphatase, elicited similar contractions in ESO and LES. MLCK inhibitors (ML-7, ML-9, and SM-1) and antibodies to MLCK inhibited contraction induced by phosphatase inhibition in LES but not in ESO. The PKC inhibitor chelerythrine and antibodies to PKCε, but not antibodies to PKCβII, inhibited contraction of ESO but not of LES. In ESO, okadaic acid triggered translocation of PKCε from cytosolic to particulate fraction and increased activity of integrin-linked kinase (ILK). Antibodies to the mitogen-activated protein (MAP) kinases ERK1/ERK2 and to ILK, and the MAP kinase kinase (MEK) inhibitor PD-98059, inhibited okadaic acid-induced ILK activity and contraction of ESO. We conclude that phosphatase inhibition potentiates the effects of MLCK in LES but not in ESO. Contraction of ESO is mediated by activation of PKCε, MEK, ERK1/2, and ILK.
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DOI:
10.1152/ajpgi.2001.281.2.g467
发表时间:
2001
期刊:
American journal of physiology. Gastrointestinal and liver physiology.
影响因子:
--
作者:
Sohn,UD;Cao,W;Tang,DC;Stull,JT;Haeberle,JR;Wang,CL;Harnett,KM;Behar,J;Biancani,P
通讯作者:
Biancani,P
DOI:
10.1152/ajpgi.2000.279.1.g201
发表时间:
2000
期刊:
American journal of physiology. Gastrointestinal and liver physiology
影响因子:
--
作者:
Murthy,KS;Grider,JR;Kuemmerle,JF;Makhlouf,GM
通讯作者:
Makhlouf,GM
DOI:
10.1165/ajrcmb.16.5.9160841
发表时间:
1997-05-01
影响因子:
6.4
作者:
Whelchel, A;Evans, J;Posada, J
通讯作者:
Posada, J
影响因子:
64.8
作者:
Uehata, M;Ishizaki, T;Narumiya, S
通讯作者:
Narumiya, S
影响因子:
4.8
作者:
C. Shin;Yul Pyo Lee;T. Lee;H. Song;U. Sohn
通讯作者:
U. Sohn