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PCB126 inhibits adipogenesis of human preadipocytes
Journal article   Open access   Peer reviewed

PCB126 inhibits adipogenesis of human preadipocytes

Gopi Gadupudi, Francoise A Gourronc, Gabriele Ludewig, Larry W Robertson and Aloysius J Klingelhutz
Toxicology in vitro, Vol.29(1), pp.132-141
02/2015
DOI: 10.1016/j.tiv.2014.09.015
PMCID: PMC4250299
PMID: 25304490
url
https://doi.org/10.1016/j.tiv.2014.09.015View
Published (Version of record) Open Access

Abstract

Emerging evidence indicates that persistent organic pollutants (POPs), including polychlorinated biphenyls (PCBs), are involved in the development of diabetes. Dysfunctional adipocytes play a significant role in initiating insulin resistance. Preadipocytes make up a large portion of adipose tissue and are necessary for the generation of functional mature adipocytes through adipogenesis. PCB126 is a dioxin-like PCB and a potent aryl hydrocarbon receptor (AhR) agonist. We hypothesized that PCB126 may be involved in the development of diabetes through disruption of adipogenesis. Using a newly developed human preadipocyte cell line called NPAD (Normal PreADipocytes), we found that exposure of preadipocytes to PCB126 resulted in significant reduction in their subsequent ability to fully differentiate into adipocytes, more so than when the cells were exposed to PCB126 during differentiation. Reduction in differentiation by PCB126 was associated with downregulation of transcript levels of a key adipocyte transcription factor, PPARγ, and late adipocyte differentiation genes. An AhR antagonist, CH223191, blocked this effect. These studies indicate that preadipocytes are particularly sensitive to the effects of PCB126 and suggest that AhR activation inhibits PPARγ transcription and subsequent adipogenesis. Our results validate the NPAD cell line as a useful model for studying the effects of POPs on adipogenesis.
 ISRP Project 1 2015-2020 Synthesis Core

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