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. 2001 Oct 15;359(Pt 2):393–402. doi: 10.1042/0264-6021:3590393

Identification of a novel integral plasma membrane protein induced during adipocyte differentiation.

T Albrektsen 1, H E Richter 1, J T Clausen 1, J Fleckner 1
PMCID: PMC1222159  PMID: 11583587

Abstract

Adipocyte differentiation is co-ordinately regulated by several transcription factors and is accompanied by changes in the expression of a variety of genes. Using mRNA differential display analysis, we have isolated a novel mRNA, DD16, specifically induced during the course of adipocyte differentiation. DD16 mRNAs are present in several tissues, but among the tissues tested, a remarkably higher level of expression was found in white adipose tissue. The DD16 cDNA encoded a polypeptide of 415 amino acids containing a single N-glycosylation site and an N-terminal hydrophobic stretch of 19 amino acids forming a transmembrane segment, indicating that DD16 is a glycosylated membrane-bound protein. Polyclonal antibodies raised against the DD16 peptide detected immunoreactive DD16 in membrane fractions, notably the plasma membrane. Association of DD16 with the plasma membrane was further confirmed by biotinylation studies of cell surface proteins, suggesting that DD16 is an integral plasma membrane protein. Therefore we propose to give DD16 the name APMAP (Adipocyte Plasma Membrane-Associated Protein). Although the biological function of this polypeptide is presently unknown, our data suggest that APMAP may function as a novel protein involved in the cross-talk of mature adipocytes with the environment.

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Selected References

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