Glucose-induced vascular smooth muscle dysfunction: the role of protein kinase C

1995 ◽  
Vol 13 (5) ◽  
pp. 477-486 ◽  
Author(s):  
Bryan Williams
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Vascular Smooth Muscle ◽  
Muscle Dysfunction ◽  
Kinase C ◽  
Smooth Muscle Dysfunction

Long-term regulation of Na(+)-H+ exchange in vascular smooth muscle cells: role of protein kinase C

1991 ◽  
Vol 260 (3) ◽  
pp. C562-C569 ◽  
Author(s):  
M. Mitsuka ◽  
B. C. Berk
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Vascular Smooth Muscle ◽  
Kinetic Properties ◽  
Dependent Manner ◽  
Kinase C ◽  
Measured Exposure

Regulation of intracellular pH (pHi) plays an important role in vascular smooth muscle cell (VSMC) contractile tone and growth. We have shown that pHi in proliferating VSMC is more alkaline (7.25) than in growth-arrested cells (7.10). To study the Na(+)-H+ exchanger in the growth-dependent regulation of VSMC pHi, ethylisopropylamiloride (EIPA)-sensitive Na+ influx was measured. Exposure of growth-arrested VSMC to 10% serum initially increased Na+ influx (145% of baseline at 30 min), which then decreased (52% of baseline at 24 h). Serum-induced alterations in the kinetic properties of the Na(+)-H+ exchanger were studied by analysis of its external Na+ binding site properties. Exposure of growth-arrested VSMC to 10% serum for 24 h increased the Km for external Na+ from 54 to 380 mM, with a change in the Vmax from 155 to 199 nmol Na+.mg protein-1.min-1. The change in Km was due to activation of protein kinase C (PKC). Phorbol 12,13-dibutyrate caused a 48% decrease in EIPA-sensitive influx, the inactive 4 alpha-phorbol 12,13-didecanoate had no effect, and the PKC inhibitor sphingosine reversed the effect. Therefore, the Na(+)-H+ exchanger in VSMC is regulated in a growth-dependent manner via PKC.

scholarly journals Novel Role of Protein Kinase C-δ Tyr 311 Phosphorylation in Vascular Smooth Muscle Cell Hypertrophy by Angiotensin II

Hypertension ◽  
2008 ◽  
Vol 51 (2) ◽  
pp. 232-238 ◽  
Author(s):  
Hidekatsu Nakashima ◽  
Gerald D. Frank ◽  
Heigoro Shirai ◽  
Akinari Hinoki ◽  
Sadaharu Higuchi ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Protein Kinase C ◽  
Angiotensin Ii ◽  
Protein Kinase ◽  
Vascular Smooth Muscle ◽  
Smooth Muscle Cell ◽  
Muscle Cell ◽  
Vascular Smooth Muscle Cell ◽  
Kinase C
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