ObRa and ObRe are differentially expressed in adipose tissue in aged food-restricted rats: effects on circulating soluble leptin receptor levels.

Abstract:

:In rodents, soluble leptin receptor (SLR) may be generated by alternative splicing of ObR mRNA and/or as a cleavage product of ObR membrane-anchored receptors. In this study, we investigated the contribution of both processes on the generation of SLR in 3-, 8-, and 24-month-old Wistar rats fed ad libitum (AL) or under food restriction (FR). To this end, we determined serum SLR levels and analyzed ObRa and ObRe mRNA expression under these physiological conditions. Additionally, we studied the cellular distribution of ObRa and the generation of SLR by N-ethyl-maleimide-induced shedding from ObRa membrane receptors in isolated adipocytes. Serum SLR levels were significantly increased in 8- and 24-month-old rats under FR, whereas similar amounts were found in rats of different ages fed AL. ObRa and ObRe mRNA expression in epididymal adipose tissue increased with aging. In contrast, after FR, ObRe mRNA expression decreased, whereas ObRa mRNA expression further increased compared with 8- and 24-month-old rats fed AL. Additionally, FR promoted a change in the distribution of ObRa between internal and plasma membranes in isolated adipocytes, increasing its presence at the cell surface. Finally, the generation of SLR by N-ethyl-maleimide-induced shedding from ObRa was also increased under FR. These data suggest that shedding of ObRa membrane-anchored receptors, rather than ObRe expression, might preferentially contribute to the generation of the increased levels of SLR in serum under conditions of FR.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Gallardo N,Arribas C,Villar M,Ros M,Carrascosa JM,Martínez C,Andrés A

doi

10.1210/en.2005-0220

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

4934-42

issue

11

eissn

0013-7227

issn

1945-7170

pii

en.2005-0220

journal_volume

146

pub_type

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