Effect of phorbol esters on Ca2+ sensitivity and myosin light-chain phosphorylation in airway smooth muscle.

Effect of phorbol esters on Ca2+ sensitivity and myosin light-chain phosphorylation in airway smooth muscle.
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佛波酯对气道平滑肌 Ca2 敏感性和肌球蛋白轻链磷酸化的影响。

DOI:
10.1152/ajpcell.1998.274.5.c1253
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发表时间:
1998
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Jones,KA
Jones,KA
中科院分区:
--
文献类型:
--
作者:
Bremerich,DH;Kai,T;Warner,DO;Jones,KA

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在β-七叶皂甙通透的犬气管平滑肌上,我们研究了蛋白激酶C激动剂佛波醇12,13-二丁酸酯对恒定亚最大钙离子浓度下等长力的影响(即对钙敏感性的影响)和调节肌球蛋白轻链磷酸化的作用。PDBu增加了对钙离子的敏感性,这种增加与浓度依赖的rMLC磷酸化持续增加有关。PDBu改变了rMLC磷酸化和等长力之间的关系,使得等长力的增加小于观察到的rMLC磷酸化增加的预期。观察了四种PKC抑制剂[Calphostin C、PKC假底物氯化白屈菜红碱、PKC多肽-(19-31)(PSSI)和星形孢子素]对PDBu诱导的钙敏感性的影响,以及Calphostin C和PSSI对rMLC磷酸化的影响。这些化合物均不能阻止或逆转PDBu诱导的钙敏感性增加,但可抑制PDBu诱导的rMLC磷酸化增加。我们的结论是,PDBu通过激活PKC来增加rMLC的磷酸化,但与PDBu相关的诱导的钙敏感性增加是由通透性气道平滑肌上PKC激活以外的机制介导的。
We studied in β-escin-permeabilized canine tracheal smooth muscle (CTSM) the effect of the protein kinase C (PKC) agonist phorbol 12,13-dibutyrate (PDBu) on isometric force at a constant submaximal Ca2+concentration (i.e., the effect on Ca2+sensitivity) and regulatory myosin light-chain (rMLC) phosphorylation. PDBu increased Ca2+sensitivity, an increase associated with a concentration-dependent, sustained increase in rMLC phosphorylation. PDBu altered the relationship between rMLC phosphorylation and isometric force such that the increase in isometric force was less than that expected for the increase in rMLC phosphorylation observed. The effect of four PKC inhibitors [calphostin C, chelerythrine chloride, a pseudosubstrate inhibitor for PKC, PKC peptide-(19—31) (PSSI), and staurosporine] on PDBu-induced Ca2+sensitization as well as the effect of calphostin C and PSSI on rMLC phosphorylation were determined. Whereas none of these compounds prevented or reversed the PDBu-induced increase in Ca2+sensitivity, the PDBu-induced increase in rMLC phosphorylation was inhibited. We conclude that PDBu increases rMLC phosphorylation by activation of PKC but that the associated PDBu-induced increases in Ca2+sensitivity are mediated by mechanisms other than activation of PKC in permeabilized airway smooth muscle.
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