The pineal gland and adrenal effect each other in a nocturnal bird, Indian spotted owlet Athene brama

Guchhait, P.; Haldar, C.

Biogenic Amines 15(5): 513-519

2000


ISSN/ISBN: 0168-8561
Accession: 011533293

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Abstract
In response to seasonal as well as daily environmental cycle, the pineal gland and adrenal exhibit their inverse relationship in A. brama. For finding the reason(s), we studied the detailed response of adrenal particularly cortex to exogenous melatonin (MEL), when the adrenal was maximally active during the reproductively regressive phase (May). Further, we studied the response of the pineal gland to exogenous ACTH and corticosterone during reproductively inactive phase (August), when the pineal was maximally active. Continuous 25 days evening (1900 h) injection of MEL (20mug /100g B wt/day) significantly decreased the adrenal wt and plasma corticosterone level. On the other hand, independently morning (0500 h) injections of ACTH (25IU/100g B wt/day) and corticosterone (20mug/100g B wt/day) for same days, significantly decreased the pineal wt and plasma MEL level. Hence, we suggest that influencing each other negatively, both the pineal gland and adrenal cortex maintain their inverse relationship in this nocturnal bird.