Growth hormone (GH) responses to arginine and L-dopa alone and after GHRH pretreatment.

Abstract:

:In order to investigate the mechanisms by which arginine and L-dopa cause GH release in humans we measured the GH response to GHRH 1-44 (200 micrograms i.v.), arginine (30 g i.v. over 30 min) and L-dopa (500 mg orally) administered alone and 120 minutes following pretreatment with GHRH 1-44 (200 micrograms i.v.) in normal male subjects. Prior GHRH administration abolished the GH response to subsequent GHRH. Arginine infusion induced a rise in GH levels maximal at 45 min. Following GHRH pretreatment the GH response to arginine was enhanced, with peak values of 19.3 +/- 6.4 vs 53.3 +/- 16.5 mU/l (mean +/- SEM) respectively (P less than 0.02). L-dopa alone induced a rise in GH levels maximal at 90 min (17.6 +/- 7.4 mU/l, mean +/- SEM) but this rise was abolished by pretreatment with GHRH.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Page MD,Dieguez C,Valcavi R,Edwards C,Hall R,Scanlon MF

doi

10.1111/j.1365-2265.1988.tb03690.x

subject

Has Abstract

pub_date

1988-05-01 00:00:00

pages

551-8

issue

5

eissn

0300-0664

issn

1365-2265

journal_volume

28

pub_type

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