Pituitary Glycoprotein Hormones in Chronic Renal Failure: Evidence for an Uncontrolled Alpha-subunit Release

Overview

Journal J Endocrinol Invest

Publisher Springer

Specialty Endocrinology

Date 1993 Mar 1

PMID 7685785

Citations 4

Authors

G MEDRI

C Carella

V Padmanabhan

C M Rossi

G Amato

N G De Santo

I Z Beitins

P Beck-Peccoz

Affiliations

Soon will be listed here.

Abstract

Chronic renal failure affects the secretion of pituitary glycoprotein hormones by mechanism(s) that are still unknown. In this study, we evaluated serum concentrations of TSH, free thyroid hormones (FT4, FT3), LH, FSH, testosterone (T), and alpha-subunit (alpha-SU) in 25 uremic patients (19 males and 6 females), both in basal conditions and after stimulatory and inhibitory tests. Basal TSH levels were in the normal range, while FT4 and FT3 were significantly lower than in controls. Basal LH and FSH levels were clearly elevated. The LH levels measured by RIA were significantly higher than those measured by a "two-site" IRMA (48.9 +/- 16.5 vs 18.0 +/- 8.6 U/L) due to alpha-SU cross-reactivity in RIA. FSH bioactivity was normal in all patients. Serum T was normal in all but 3 males, without any correlation with LH and FSH levels. Serum alpha-SU concentrations were significantly elevated (5.5 +/- 3.0 vs 0.4 +/- 0.2 microgram/L). Of 17 patients, the TSH response to TRH was normal in 9 and impaired in 8, whereas alpha-SU response was normal in 5 and impaired in 12. In 8 male patients, TRH plus GnRH caused a normal LH and FSH response in 4 patients, while the increase of alpha-SU was normal in only one patient and significantly lower than expected in subjects with comparable basal alpha-SU levels in the remaining 7. In 2 patients, the combined suppression test with T undecanoate and T3 completely blocked TSH secretion and reduced both LH and FSH release by 30%, while serum alpha-SU levels did not change.(ABSTRACT TRUNCATED AT 250 WORDS)

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