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Actions downstream of cGMP/PKG can reverse PKC-mediated phosphorylation of CPI-17 and Ca2+ sensitization in smooth muscle.
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- Bonnevier, Johan (författare)
- Lund University,Lunds universitet,Institutionen för experimentell medicinsk vetenskap,Medicinska fakulteten,Department of Experimental Medical Science,Faculty of Medicine
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- Arner, Anders (författare)
- Lund University,Lunds universitet,Kärlfysiologi,Forskargrupper vid Lunds universitet,Vascular Physiology,Lund University Research Groups
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(creator_code:org_t)
- 2004
- 2004
- Engelska.
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Ingår i: Journal of Biological Chemistry. - 1083-351X. ; 279:24, s. 28998-29003
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Abstract
Ämnesord
Stäng
- Ca2+ sensitivity of smooth muscle contraction is modulated by several systems converging on myosin light chain phosphatase (MLCP). Rho-Rho kinase is considered to inhibit MLCP via phosphorylation, whereas protein kinase C (PKC) induced sensitization has been shown to be dependent on phosphorylation of the inhibitory protein CPI-17. We have explored the interaction of cGMP-dependent protein kinase (PKG) with Ca2+ sensitization pathways using permeabilized mouse smooth muscle. Three conditions giving ~50% of maximal active force were compared in small intestinal preparations: 1) Ca2+-activated unsensitized muscle (pCa 5.9 with Rho kinase inhibitor Y27632); 2) Rho-Rho kinase-sensitized muscle (pCa 6.1 with guanosine 5'-3-O-(thio)triphosphate); and 3) PKC-sensitized muscle (pCa 6.0 with Y27632 and PKC activator phorbol 12,13-dibutyrate). 8-Br-cGMP relaxed the sensitized muscles but had marginal effects on unsensitized preparations, showing that PKG reverses both PKC and Rho-mediated Ca2+ sensitization. CPI-17 was present in permeabilized intestinal tissue. In PKC-sensitized preparations, CPI-17 phosphorylation decreased in response to 8-Br-cGMP. The rate of PKC-mediated phosphorylation in the presence of the MLCP inhibitor microcystin-LR was not influenced by 8-Br-cGMP. PKC-induced Ca2+ sensitization also was reversed in vascular smooth muscle tissues (portal vein and femoral artery). We conclude that actions downstream of cGMP/PKG can reverse PKC-mediated phosphorylation of CPI-17 and Ca2+ sensitization in smooth muscle.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Physiology (hsv//eng)
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