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The epididymal fat pad is a male gonadal adipocyte tissue and is histochemically separated into distal and proximal parts. The development of epididymal fat during postnatal period has not been examined in detail. A previous research showed that expression of adipocyte-associated molecules in the distal epididymal fat of mouse is generally increased as postnatally aged. In the present study, expressional patterns of same adipocyte-associated molecules in the mouse proximal epididymal fat at 2, 5, 8, and 12 months of age were studied by quantitative real-time PCR analysis and were compared with those in the distal epididymal fat. The expressional levels of peroxisome proliferator-activated receptor gamma ( Pparg ), lipoprotein lipase ( Lpl ), and fatty acid synthase ( Fasn ) at 5 months of age were significantly lower than those at 2 months of age, while transcript level of leptin ( Lep ) at 5 months was higher than that at 2 months of age. The transcript levels of all molecules at 8 months of age were significantly increased, compared with those at 2 and 5 months of age. At 12 months of age, expression of delta like non-canonical Notch ligand 1 ( Dlk1 ) was further significantly increased, while there was no change on the transcript level of Pparg and significant decreases of Fabp4 , Retn , Lpl , Lep , Fasn , and adiponectin ( Adipoq ) transcript levels. The current findings show that expressional patterns of molecules associated with adipocyte in the proximal epididymal fat is somewhat different with those of the distal epididymal fat, suggesting the existence of regional variance in the epididymal fat.

Postnatal Expressional Patterns of Adipose-Associated Molecules in the Mouse Proximal Epididymal Fat