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Oka, S. et al.

Thioredoxin-binding protein-2-like inducible membrane protein is a novel vitamin D3 and peroxisome proliferator-activated receptor (PPAR)gamma ligand target protein that regulates PPARgamma signaling.

Thioredoxin binding protein-2 (TBP-2), which is identical with vitamin D3 (VD3) up-regulated protein 1 (VDUP1), plays a crucial role in the integration of glucose and lipid metabolism. There are three highly homologous genes of TBP-2/vitamin D3 up-regulated protein 1 in humans, but their functions remain unclear. Here we characterized a TBP-2 homolog, TBP-2-like inducible membrane protein (TLIMP). In contrast to TBP-2, TLIMP displayed no significant binding affinity for thioredoxin. TLIMP exhibited an inner membrane-associated pattern of distribution and also colocalized with transferrin and low-density lipoprotein, indicating endosome- and lysosome-associated functions. VD3 and ligands of peroxisome proliferator-activated receptor (PPAR)-gamma, an important regulator of energy metabolism and cell growth inhibition, induced the expression of TLIMP as well as TBP-2. Overexpression of TLIMP suppressed both anchorage-dependent and -independent cell growth and PPARgamma ligand-inducible gene activation. These results suggest that TLIMP, a novel VD3- or PPARgamma ligand-inducible membrane-associated protein, plays a regulatory role in cell proliferation and PPARgamma activation.[1]

References

Thioredoxin-binding protein-2-like inducible membrane protein is a novel vitamin D3 and peroxisome proliferator-activated receptor (PPAR)gamma ligand target protein that regulates PPARgamma signaling. Oka, S., Masutani, H., Liu, W., Horita, H., Wang, D., Kizaka-Kondoh, S., Yodoi, J. Endocrinology (2006) [Pubmed]

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