Regulation of pineal gland and gonadal functions of a tropical nocturnal bird, Indian spotted owlet, Athene brama following different 5-methoxyindoles treatments

Guchhait, P.; Haldar, C.

Biogenic Amines 15(2): 263-273


ISSN/ISBN: 0168-8561
Accession: 011270073

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The role of melatonin in control of reproduction in vertebrates has been studied extensively. In this regard, the other indoles synthesized by pineal gland were also considered and compared for potency. It is still unknown whether different 5-methoxyindoles including MEL can regulate the reproductive status of a nocturnal bird which breeds seasonally. An attempt was made by exposing both sexes of spotted owlet Athene brama to exogenous MEL, 5-MT, 5-MTL and 5-MTP treatments at evening hour during two crucial reproductive phases i.e. active(March) and inactive(August) when the pineal gland was existing in inactive and active states accordingly. The MEL, 5-MT and 5-MTL appeared as the most potent pineal compounds by regulating (inhibiting and stimulating) the pineal function in a reproductive phase specific manner. However, irrespective of reproductive phase these indoles inhibited the gonadal steroidogenic function in both sexes of owlets. While the other indole 5-MTP has been failed to present any significant effect either on pineal or on gonad of spotted owlet. Therefore, it is suggested that the methoxyindoles (except 5-MTP) basically have an inhibitory effect on gonadal steroidogenesis and a phase dependent effect on pineal gland function of this nocturnal bird.