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Effects of PCB 52 Exposure Via Sub-Acute Nose-Only Inhalation on Gene Expression in Fat Depots of Adolescent Rats

ABSTRACT: Polychlorinated biphenyls (PCBs) are persistent environmental toxicants that pose a variety of health risks in humans. PCB 52 has been found in the indoor air of schools where adolescent students and staff are being actively exposed. This study examined the three different fat depots, namely, brown adipose tissue (BAT), subcutaneous adipose tissue (SAT), and visceral adipose tissue (VAT), of adolescent Sprague-Dawley rats after sub-acute exposure to PCB 52 via nose-only inhalation. Rats were exposed for 4 hours daily for 28 consecutive days. RNA extracted from both male and female fat depots were submitted for RNA sequencing to compare the effects of PCB 52 on the expression of genes in the fat depots.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE259369 | GEO | 2024/03/04

REPOSITORIES: GEO

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Project description:*Background: Adipocytes mainly function as energy storage and endocrine cells. The amount and distribution of fat are important factor that influence the meat quality in the beef industry. Fat depot can be found around internal organ (ometal), beneath the skin (subcutaneous), and between muscles (intramuscular). Different adipose depot showed the biological and genetic difference depending on their location. This inter-depot variation might be influenced by the inherent genetic programing for development of adipose depots. In this study, we used RNA-seq data to investigate the difference in transcriptome of various adipose depots in Hanwoo. *Results: Using RNA-seq, we identified 5797, 2156, and 5455 DEGs in the comparison between OI, OS, and IS respectively (FDR<0.01) and found 853, 48, and 979 DEGs specific to subcutaneous, intramuscular and omental fat respectively. DEGs in intramuscular fat were highly enriched the metabolism related pathways compared to other fat depots. DEGs specific to the omental fat is significantly enriched in PPAR signaling pathway and cell-junction related pathway. In subcutaneous fat, cytokine-cytokine receptor interaction with chemokines (CXC and CC subfamily) was the most significantly enriched the pathways. Interestingly, melanogenesis pathway was associated with the subcutaneous depot. Even though the adipose tissues shared the same pathways for adipocyte differentiation, the regulation of genes were different based on the depot. *Conclusions: We comparatively analyzed the transcripome profile from different adipose tissues using NGS and identified DEGs between adipose depot and specific to depot in Hanwoo animals. The functional annotation analysis of DEGs found that transcriptome profile difference in various adipose tissue of intramuscular, subcutaneous, and ometal fat. whole mRNA sequencing profiles of nine Korean native cattle (nine profiles of omental fat tissue, nine profiles of intramuscular fat tissue, nine profiles of subcutaneous fat tissue and eight profiles of muscle tissue)

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Effects of PCB 52 Exposure Via Sub-Acute Nose-Only Inhalation on Gene Expression in Fat Depots of Adolescent Rats

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