当前位置： SCI文献检索 > MOLECULAR AND CELLULAR ENDOCRINOLOGY期刊下所有文献 > Prostaglandin E2 increases adenosine 3',5'-monophosphate concentration and binding-site occupancy, and stimulates serotonin-N-acetyltransferase activity in rat pineal glands in vitro.

Prostaglandin E2 increases adenosine 3',5'-monophosphate concentration and binding-site occupancy, and stimulates serotonin-N-acetyltransferase activity in rat pineal glands in vitro.

Abstract：

:The effects of prostaglandins (PGs) on rat pineal metabolism were examined in vitro. PGE2 (0.01-1 microM) increased the activity of serotonin-N-acetyltransferase (SNAT), the stimulation curve exhibiting a maximum at 0.1 microM. PGE1 increased SNAT activity only at the highest dose (1 microM) whereas PGF2 alpha, 15-keto-PGF2 alpha or PGI2 did not affect the enzymic activity. The stimulation of SNAT activity brought about by PGE2 in pineals from ganglionectomized rats was greater than in sham-operated controls at all the doses studied, suggesting that the observed effect is predominantly post-synaptic. Only PGE2 significantly increased pineal cAMP accumulation in vitro at doses between 0.01 and 1 microM, and depressed the unoccupied cAMP-binding sites in pineal 900 g supernatants. The total number of cAMP-binding sites remained unaltered after incubation of PGE2. The present observations together with the previously reported NE-induced release of PGs in incubated pineal glands, the occurrence of pineal PG-binding sites and the indomethacin blockade of the nocturnal rise of pineal SNAT and melatonin content, support a role for PGs in the control of melatonin synthesis.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Ritta MN,Cardinali DP

doi

10.1016/0303-7207(81)90066-6

subject

Has Abstract

pub_date

1981-08-01 00:00:00

pages

151-9

issue

2

eissn

0303-7207

issn

1872-8057

journal_volume

23

pub_type

杂志文章

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