Calcium-and phospholipid-dependent protein kinase C and phosphatidylinositol kinase: Two major phosphorylation systems in the cornea
作者:
BazanHaydee E.P.,
DobardPaul,
ReddySridevi T.K.,
期刊:
Current Eye Research
(Taylor Available online 1987)
卷期:
Volume 6,
issue 5
页码: 667-673
ISSN:0271-3683
年代: 1987
DOI:10.3109/02713688709034829
出版商: Taylor&Francis
数据来源: Taylor
摘要:
The signaling messengers for the regulation of intracellular calcium-dependent functions involve a phospholipid-sensitive protein kinase (protein kinase C) modulated by diacylglycerol, which is a product of phosphoinositide degradation. We found that protein kinase C activity is two times higher in the epithelium than in the stroma-endothelial layers of the rabbit cornea. 12-0-tetradecanoylphorbol-13-acetate (TPA) and phosphati-dylserine stimulate protein kinase C at low Ca2+concentrations. The TPA-phosphatidyl-serine stimulated activity of corneal epithelium was recovered in the soluble fraction; in the membrane-bound fraction, a very active phosphatidylinositol kinase accounted for half the basal phosphorylation of the corneal epithelium.
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