Hormonal stimulation of 12(R)-HETE, a cytochrome P450 arachidonic acid metabolite in the rabbit cornea
作者:
DavisKaren L.,
DunnMichael W.,
SchwartzmanMichal Laniado,
期刊:
Current Eye Research
(Taylor Available online 1990)
卷期:
Volume 9,
issue 7
页码: 661-667
ISSN:0271-3683
年代: 1990
DOI:10.3109/02713689008999581
出版商: Taylor&Francis
数据来源: Taylor
摘要:
12(R)-HETE [12(R)-hydroxy-5,8,10,14 eico-satetraenoic acid] is one of the major arachidonic acid metabolites produced by microsomal cytochrome P450 of the corneal epithelium. This metabolite is a potent inhibitor of Na+-K+-ATPase activity in several tissues. We investigated endogenous production of 12(R)-HETE in the rabbit corneal epithelium. Incubation of corneal epithelial sheets (prelabeled with14C-arachidonic acid) with arginine vasopressin resulted in the production of radioactive 12(R)-HETE suggesting its formation from endogenously labeled arachidonic acid. The maximal response was obtained with 1μM arginine vasopressin and represents a 15-fold increase in 12(R)-HETE formation compared with that of control tissues. Stimulation of14-arachidonic acid release with a detergent, digitonin, also resulted in endogenous 12(R)-HETE formation. Analysis of the incubation media following digitonin treatment of prelabeled corneal epithelial sheets revealed that 12(R)-HETE production was maximal at 20μM digitonin, a 17-fold increase over control values. This study is the first to describe hormonal and traumatic stimulation of 12(R)-HETE formation from endogenously labeled arachidonic acid in intact corneal tissues. This study demonstrates that the formation of this Na+-K+-ATPase inhibitor can be modulated by physiological and pathophysiological regulation.
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