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Orexin receptor expression in human adipose tissue: effects of orexin-A and orexin-B

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Digby, J. E., Chen, J., Tang, J. Y., Lehnert, H., Matthews, R. N. and Randeva, Harpal S. (2006) Orexin receptor expression in human adipose tissue: effects of orexin-A and orexin-B. JOURNAL OF ENDOCRINOLOGY, 191 (1). pp. 129-136. doi:10.1677/joe.1.06886

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Official URL: http://dx.doi.org/10.1677/joe.1.06886

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Abstract

Orexin-A and orexin-B, via their receptors orexin-1 receptor (OX1R) and orexin-2 receptor (OX2R) have been shown to play a role in the regulation of feeding, body weight, and energy expenditure. Adipose tissue also contributes significantly to the maintenance of body weight by interacting with a complex array of bioactive peptides; however, there are no data as yet on the expression of orexin components in adipose tissue. We, therefore, analyzed the expression of OX1R and OX2R in human adipose tissue and determined functional responses to orexin-A and orexin-B. OX1R and OX2R mRNA expression was detected in subcutaneous (s.c.) and omental adipose tissue and in isolated adipocytes. Protein for OX1R and OX2R was also detected in whole adipose tissue sections and lysates. Treatment with orexin-A, and orexin-B (100 nM, 24 h) resulted in a significant increase in peroxisome proliferator-activated receptors gamma-2 mRNA expression in s.c. adipose tissue (P < 0.05). Hormone sensitive lipase mRNA was significantly reduced in omental adipose tissue with orexin-A and orexin-B treatment (P < 0.05). Glycerol release from omental adipose tissue was also significantly reduced with orexin-A treatment (P < 0.05).

These findings demonstrate for the first time the presence of functional orexin receptors in human adipose tissue and suggest a role for orexins in adipose tissue metabolism and adipogenesis.

Item Type: Journal Article
Subjects: R Medicine > RC Internal medicine
Journal or Publication Title: JOURNAL OF ENDOCRINOLOGY
Publisher: SOC ENDOCRINOLOGY
ISSN: 0022-0795
Official Date: October 2006
Dates:
DateEvent
October 2006UNSPECIFIED
Volume: 191
Number: 1
Number of Pages: 8
Page Range: pp. 129-136
DOI: 10.1677/joe.1.06886
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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