The effect of phorbol esters on the chloride secreting epithelium of the rabbit cornea
作者:
CrossonCraig E.,
KlyceStephen D.,
BazanHaydee E.P.,
BazanNicolas G.,
期刊:
Current Eye Research
(Taylor Available online 1986)
卷期:
Volume 5,
issue 7
页码: 535-541
ISSN:0271-3683
年代: 1986
DOI:10.3109/02713688608996377
出版商: Taylor&Francis
数据来源: Taylor
摘要:
Tumor-promoting phorbol esters have been shown to modulate a number of physiological events in various cell types, and these events are associated with the activation of protein kinase C. The purpose of this study was to examine the effects of phorbol ester stimulation on protein kinase C activity and epithelial ion transport in the Cl−secreting rabbit corneal epithelium. We report here that nanomolar concentrations of tumor-promoting phorbol ester, 12-0-tetradecanoyl-phorbol-13 acetate (TPA), stimulate active ion transport via a putative receptor located in the corneal epithelium. This stimulation is a Cl−dependent process, but is independent of 6-adrenergic receptor activation and prostaglandin formation. Biochemical data support the idea that TPA activates Ca++/phospholipid-dependent protein kinase C in the corneal epithelium. Therefore, we suggest that protein kinase C may have a role in the regulation of membrane C1−transport in the mammalian corneal epithelium.
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