Glucocorticoid receptors in ageing rats.

Abstract:

:The role of the glucocorticoid receptor (GR) in senescence was studied in rats of increasing age. Statistically significant changes in the number of GRs from rat liver were detected, whereas the affinity for the ligand triamcinolone acetonide (TA) did not change with increasing age, and was in the range of 1-2 nM. In all cases the number of receptors was lower in rats treated with hormone in vivo relative to untreated animals. In addition, we have found changes in GR activation, as measured by the binding to DNA cellulose in the mentioned age groups. Furthermore, expression of the glucocorticoid hormone (GH)-inducible gene, tyrosine amino transferase (TAT) also showed age-related alterations. We conclude that receptor function shows oscillatory changes during ageing. In addition, response to GH generally declines towards the older age. This specific periodicity in functional characteristics of the GR may reconcile conflicting results about the receptor number and properties during the ageing process, and marks particular age at which individual organism shows the highest or the lowest sensitivity to the actions of GH.

journal_name

Exp Gerontol

journal_title

Experimental gerontology

authors

Djordjevic-Markovic R,Radic O,Jelic V,Radojcic M,Rapic-Otrin V,Ruzdijic S,Krstic-Demonacos M,Kanazir S,Kanazir D

doi

10.1016/s0531-5565(99)00067-4

keywords:

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

971-82

issue

8

eissn

0531-5565

issn

1873-6815

pii

S0531556599000674

journal_volume

34

pub_type

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