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Circadian variations of prostaglandin E2 and F2 α release in the golden hamster retina
Author(s) -
De Zavalía Nuria,
Fernandez Diego C.,
Sande Pablo H,
Keller Sarmiento María I.,
Golombek Diego A.,
Rosenstein Ruth E.,
Silberman Dafne M.
Publication year - 2010
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2009.06517.x
Subject(s) - circadian rhythm , golden hamster , prostaglandin e2 , retina , hamster , biology , neuroscience , endocrinology
J. Neurochem. (2009) 112 , 972–979. Abstract Circadian variations of prostaglandin E2 and F2α release were examined in the golden hamster retina. Both parameters showed significant diurnal variations with maximal values at midnight. When hamsters were placed under constant darkness for 48 h, the differences in prostaglandin release between subjective mid‐day and subjective midnight persisted. Western blot analysis showed that cyclooxygenase (COX)‐1 levels were significantly higher at midnight than at mid‐day, and at subjective midnight than at subjective mid‐day, whereas no changes in COX‐2 levels were observed among these time points. Immunohistochemical studies indicated the presence of COX‐1 and COX‐2 in the inner (but not outer) retina. Circadian variations of retinal prostaglandin release were also assessed in suprachiasmatic nuclei (SCN)‐lesioned animals. Significant differences in retinal prostaglandin release between subjective mid‐day and subjective midnight were observed in SCN‐lesioned animals. These results indicate that hamster retinal prostaglandin release is regulated by a retinal circadian clock independent from the SCN. Thus, the present results suggest that the prostaglandin/COX‐1 system could be a retinal clock output or part of the retinal clock mechanism.