Effects of the constitutively active proteolytic fragment of protein kinase C on the contractile properties of demembranated smooth muscle fibres

1992 ◽  
Vol 13 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Janice E. Parente ◽  
Michael P. Walsh ◽  
W. Glenn L. Kerrick ◽  
Phyllis E. Hoar
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Contractile Properties ◽  
Muscle Fibres ◽  
Proteolytic Fragment ◽  
Kinase C ◽  
Constitutively Active

Smooth muscle protein kinase C

1994 ◽  
Vol 72 (11) ◽  
pp. 1392-1399 ◽  
Author(s):  
Michael P. Walsh ◽  
Jacquelyn E. Andrea ◽  
Bruce G. Allen ◽  
Odile Clément-Chomienne ◽  
Elizabeth M. Collins ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Thin Filament ◽  
Muscle Protein ◽  
Smooth Muscles ◽  
Proteolytic Fragment ◽  
Cross Bridge ◽  
Kinase C ◽  
Substrate Peptide

Protein kinase C (PKC) was first implicated in the regulation of smooth muscle contraction with the observation that phorbol esters induce slowly developing, sustained contractions. In some vascular smooth muscles, e.g., ferret aorta, phorbol ester induced contractions occur without an increase in sarcoplasmic free-Ca2+ concentration ([Ca]i) or myosin light chain phosphorylation. This response appears to be mediated by a Ca2+-independent isoenzyme of PKC (probably PKCε), since saponin-permeabilized single ferret aortic smooth muscle cells, which retain receptor coupling, developed force in response to phenylephrine at low free [Ca2+] (pCa 7.0–8.6) and the constitutively active proteolytic fragment of PKC (PKM) elicited a contraction at pCa 7 comparable with the phenylephrine-induced contraction. Both contractions were reversed by a pseudo-substrate peptide inhibitor of PKC. These observations suggest a mechanism whereby α-adrenergic agonists may elicit a contractile response without a Ca2+ signal: α-adrenergic stimulation of phosphatidylcholine-specific phosphoiipase C or D (the latter in conjunction with phosphatidate phosphohydrolase) generates diacylglycerol. In the absence of an increase in [Ca2+]i, diacylglycerol specifically activates so-called novel PKCs, of which ε is the only isoenzyme known to be expressed in vascular smooth muscle. Recent evidence suggests that PKC may trigger a cascade of phosphorylation reactions, resulting in activation of mitogen-activated protein kinase and phosphorylation of the thin filament associated protein caldesmon. Alternatively, or additionally, PKC may directly phosphorylate calponin, another thin filament associated protein. These phosphorylations are predicted to alleviate inhibition of the cross-bridge cycling rate by these thin-filament proteins. The slow development of force would then result from a slow rate of cross-bridge cycling due to the low basal level of myosin phosphorylation.Key words: protein kinase C, smooth muscle, calcium, caldesmon, calponin.

Regulation of Scavenger Receptor Expression in Smooth Muscle Cells by Protein Kinase C

1997 ◽  
Vol 17 (5) ◽  
pp. 969-978 ◽  
Author(s):  
Michele Mietus-Snyder ◽  
Annabelle Friera ◽  
Christopher K. Glass ◽  
Robert E. Pitas
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Smooth Muscle Cells ◽  
Scavenger Receptor ◽  
Muscle Cells ◽  
Receptor Expression ◽  
Kinase C

Antiproliferative action of protein kinase C in cultured rabbit aortic smooth muscle cells

1987 ◽  
Vol 173 (2) ◽  
pp. 504-514 ◽  
Author(s):  
Ken-Ichi Kariya ◽  
Yasuo Fukumoto ◽  
Terutaka Tsuda ◽  
Takeshi Yamamoto ◽  
Yasuhiro Kawahara ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Smooth Muscle Cells ◽  
Muscle Cells ◽  
Aortic Smooth Muscle Cells ◽  
Aortic Smooth Muscle ◽  
Kinase C ◽  
Antiproliferative Action
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