Chicken Peroxisome proliferators activator α ELISA Kit

BackgroundThe expression of genes involved in regulating adipogenesis and lipid metabolism may affect economically important fatness traits in pigs. Allele-specific expression (ASE) reflects imbalance between allelic transcript levels and can be used to identify underlying cis-regulatory elements. ASE has not yet been intensively studied in pigs. The aim of this investigation was to analyze the differential allelic expression of four genes, PPARA, PPARG, SREBF1, and PPARGC1A, which are involved in the regulation of fat deposition in porcine subcutaneous and visceral fat and longissimus dorsi muscle.ResultsQuantification of allelic proportions by pyrosequencing revealed that both alleles of PPARG and SREBF1 are expressed at similar levels. PPARGC1A showed the greatest ASE imbalance in fat deposits in Polish Large White (PLW), Polish Landrace and Pietrain pigs; and PPARA in PLW pigs. Significant deviations of mean PPARGC1A allelic transcript ratio between cDNA and genomic DNA were detected in all tissues, with the most pronounced difference (p<0.001) in visceral fat of PLW pigs. To search for potential cis-regulatory elements affecting ASE in the PPARGC1A gene we analyzed the effects of four SNPs (rs337351686, rs340650517, rs336405906 and rs345224049) in the promoter region, but none were associated with ASE in the breeds studied. DNA methylation analysis revealed significant CpG methylation differences between samples showing balanced (allelic transcript ratio approximate to 1) and imbalanced allelic expression for CpG site at the genomic position in chromosome 8 (SSC8): 18527678 in visceral fat (p=0.017) and two CpG sites (SSC8:18525215, p=0.030; SSC8:18525237, p=0.031) in subcutaneous fat.ConclusionsOur analysis of differential allelic expression suggests that PPARGC1A is subjected to cis-regulation in porcine fat tissues. Further studies are necessary to identify other regulatory elements localized outside the PPARGC1A proximal promoter region.

Val-Phe-Val-Arg-Asn (VFVRN) has been identified and screened from lipid-lowering chickpea peptides (ChPs) previously. This work explored its lipid-lowering mechanisms by using a high-fat diet C57BL/6J mice model and 3T3-L1 preadipocyte cell model. Administration of VFVRN to hyperlipidemic mice significantly decreased the levels of total cholesterol (TC) and total triglyceride (TG) in liver and serum (P < 0.05), and increased the fecal triglyceride excretions. The expressions of sterol regulatory element-binding protein (SREBP)-2, liver X receptor (LXR)a, peroxisome proliferator-activated receptors (PPAR)a and their related target genes were regulated via AMP-activated protein kinase (p-AMPK) pathway in liver. Compared with model group, the levels of PPARa and PPAR. in 10 mg/kg VFVRN group were up-regulated by 36.96% and 36.49% in adipose tissues, while LXRa and ATP binding cassette G5/8 transporters (ABGC5/8) were lowered by 87.26% and 145% in small intestine respectively. Moreover, VFVRN promoted 3T3-L1 preadipocyte apoptosis by regulating the expressions of BaX, Caspase-3 and Bcl-2.