Rabbits have a circadian rhythm of aqueous humor cyclic AMP.

Abstract:

:Rabbits have circadian rhythms of intraocular pressure (IOP) and aqueous flow. The dark phase increases of IOP and flow are associated with increased aqueous cyclic AMP. If the daily rhythm of aqueous cyclic AMP reflects changes of tissue levels of cyclic AMP which mediate one of the mechanisms which control the rhythms of IOP and aqueous flow, then it must be a circadian rhythm as are the rhythms of IOP and flow. A recent report showed no change in aqueous cyclic AMP from 2 hrs before to 2 hrs after the beginning of subjective dark in animals housed in constant dark. Because the increase of intraocular pressure at the same times did persist in constant dark, the authors concluded that a significant portion of the circadian rhythm of IOP is unrelated to cyclic AMP mediated ocular mechanisms. However, if an inhibitor of cyclic nucleotide phosphodiesterase is added to aqueous samples after harvesting by paracentesis, it is possible to show that most of the increase of aqueous cyclic AMP from mid-light phase to mid-dark phase persists in constant dark and is therefore likely to reflect a circadian rhythm of tissue cyclic AMP.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Kiuchi Y,Gregory DS

doi

10.3109/02713689209033491

subject

Has Abstract

pub_date

1992-09-01 00:00:00

pages

935-8

issue

9

eissn

0271-3683

issn

1460-2202

journal_volume

11

pub_type

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