Depot-related and thiazolidinedione-responsive expression of uncoupling protein 2 (UCP2) in human adipocytes

Digby, V. E., Crowley, V., Sewter, C., Whitehead, J. P., Prins, J. and Orahilly, S. (2000) Depot-related and thiazolidinedione-responsive expression of uncoupling protein 2 (UCP2) in human adipocytes. International Journal of Obesity, 24 5: 585-592. doi:10.1038/sj.ijo.0801201

Author Digby, V. E.
Crowley, V.
Sewter, C.
Whitehead, J. P.
Prins, J.
Orahilly, S.
Title Depot-related and thiazolidinedione-responsive expression of uncoupling protein 2 (UCP2) in human adipocytes
Journal name International Journal of Obesity   Check publisher's open access policy
ISSN 0307-0565
Publication date 2000-05
Sub-type Article (original research)
DOI 10.1038/sj.ijo.0801201
Volume 24
Issue 5
Start page 585
End page 592
Total pages 8
Place of publication London, United Kingdom
Publisher Nature
Collection year 2000
Language eng
Formatted abstract
Objectives: Uncoupling protein 2 (UCP2) is a recently described homologue of the uncoupling protein of brown adipocytes (UCP1), which is expressed at high levels in human white adipose tissue. Studies were undertaken (1) to establish whether the expression of UCP2 mRNA varies in a depot-related manner in isolated human adipocytes, (2) to determine whether thiazolidinedione exposure influences the expression of UCP2 mRNA in cultured human pre-adipocytes, and (3) to determine whether human UCP2 is targeted to mitochondria when transfected into mammalian cells. Subjects: Abdominal subcutaneous and omental adipose tissue biopsies were obtained from adult patients undergoing elective intra-abdominal surgical procedures.

Measurements: A competitive reverse transcriptase-polymerase chain reaction (RT-PCR) was used to quantify UCP2 mRNA expression in human omental and subcutaneous adipocytes, and in cultured human preadipocytes differentiated in vitro using the thiazolidinedione, BRL49653. Chinese hamster ovary cells were transfected with a vector expressing human UCP2, and its cellular localization was determined by confocal immunofluorescence microscopy.

Results: Adipocytes isolated from human omentum consistently expressed more UCP2 mRNA than did subcutaneous adipocytes from the same subjects (mean fold difference 2.92±0.44 P<0.001, n=11) with no effect of gender or body mass index being seen. BRL49653 treatment of subcutaneously, but not omentally, derived preadipocytes stimulated expression of UCP2 mRNA (5.1±1.1 fold). Transfected human UCP2 was detected exclusively in mitochondria of CHO cells.

Conclusions: Increased expression of UCP2 in human omental adipose tissue relative to subcutaneous adipose tissue is related to the expression levels in adipocytes per se, a finding which may relate to the particular functional attributes of this sub-population of adipocytes. Furthermore, BRL 49653 has site-specific effects of on the expression of UCP2 in human preadipocytes, a finding which may be relevant to the therapeutic effects of such compounds. Finally we present evidence for the mitochondrial localisation of human UCP2.
Keyword Confocal immunofluorescence microscopy
Human adipose tissue
Uncoupling protein 2
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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Created: Tue, 10 Jun 2008, 10:55:04 EST