Effect of central injection of bradykinin and bradykinin potentiating factor upon release of anterior pituitary hormones in ovariectomized female rats.

Abstract:

:The effects of third ventricular (IVT) injection of 25 micrograms of bradykinin (BK) upon plasma levels of LH, FSH, TSH, GH and prolactin were investigated in conscious ovariectomized female rats bearing indwelling jugular cannulae. Some animals were pretreated with bradykinin potentiating factor (BPF). Intravenous administration of BK had no effect upon hormone levels. IVT injection of BK significantly depressed plasma prolactin levels at 15 and 30 min post-drug, with levels returning to control values by 60 in. Pretreatment of animals with BPF (75 micrograms/3 microliter) prolonged the prolactin suppression induced by BK for up to two hours. Plasma LH, FSH, TSH and GH levels in BK-rats were not significantly different from those of saline-injected animals at any time point measured. Neither BPF alone nor in conjunction with BK had any effects upon plasma levels of TSH; however, BK plus BPF suppressed FSH concentrations at 75 min post-BPF, while BPF alone appeared to increase GH levels at 45 min. In vitro incubation of hemipituitaries with 0.083, 0.83 or 8.33 microgram/ml BK had no effect upon the release of LH, TSH or prolactin compared to control values. However, the secretion of GH and FSH was suppressed by the lowest dose of BK tested. These results suggest that BK may play a physiological inhibitory role in the regulation of prolactin, which can be augmented by preventing its degradation, i.e. via BPF. The effect of the peptide seems to be mediated by the CNS since neither intravenous injection of BK nor in vitro incubation of pituitaries with the peptide modified prolactin release. be augmented by preventing its degradation, i.e. via BPF. The effect of the peptide seems to be mediated by the CNS since neither intravenous injection of BK nor in vitro incubation of pituitaries with the peptide modified prolactin release.

journal_name

Peptides

journal_title

Peptides

authors

Steele MK,Negro-Vilar A,McCann SM

doi

10.1016/0196-9781(80)90054-6

subject

Has Abstract

pub_date

1980-10-01 00:00:00

pages

201-5

issue

3

eissn

0196-9781

issn

1873-5169

pii

0196-9781(80)90054-6

journal_volume

1

pub_type

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