Horm Metab Res 2015; 47(08): 600-604
DOI: 10.1055/s-0034-1395677
Endocrine Research
© Georg Thieme Verlag KG Stuttgart · New York

Differential Regulation of Oxytocin Receptor in Various Adipose Tissue Depots and Skeletal Muscle Types in Obese Zucker Rats

L. Gajdosechova
1   Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia
,
K. Krskova
1   Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia
2   Center for Molecular Medicine, Slovak Academy of Sciences, Bratislava, Slovakia
,
R. Olszanecki
3   Chair of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
,
S. Zorad
1   Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia
› Author Affiliations
Further Information

Publication History

received 25 July 2014

accepted 18 November 2014

Publication Date:
07 January 2015 (online)

Abstract

Multifunctional peptide oxytocin currently undergoes intensive research due to its proposed anti-obesity properties. Until now, little is known about regulation of oxytocin receptor in metabolically active tissues in obesity. The aim of the present study was to measure expression of oxytocin receptor upon obese phenotype with respect to the variety among adipose tissue and skeletal muscles with distinct anatomical localisation. Total homogenates were prepared from epididymal, retroperitoneal and inguinal adipose tissues as well as quadriceps and soleus muscle from lean and obese Zucker rats. Oxytocin receptor protein was determined by immunoblot. Interestingly, elevated oxytocin receptor was observed in epididymal adipose tissue of obese rats in contrast to its downregulation in subcutaneous and no change in retroperitoneal fat. In lean animals, oxytocin receptor protein was expressed at similar levels in all adipose depots. This uniformity was not observed in the case of skeletal muscle in which fibre type composition seems to be determinant of oxytocin receptor expression. Quadriceps muscle with the predominance of glycolytic fibres exhibits higher oxytocin receptor expression than almost exclusively oxidative soleus muscle. Oxytocin receptor protein levels were decreased in both skeletal muscles analysed upon obese phenotype. The present work demonstrates that even under identical endocrine circumstances, oxytocin receptor is differentially regulated in adipose tissue of obese rats depending on fat depot localisation. These results also imply which tissues may be preferentially targeted by oxytocin treatment in metabolic disease.

Supporting Information

 
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