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CDK8 Regulation Of Lipid Metabolism | 6469
Journal of Obesity & Weight Loss Therapy
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Transcriptional cofactors play pivotal roles in the precise control of gene expression, and thus are involved in human health
problems, including obesity. The multi-subunit protein complex named Mediator is a transcriptional cofactor, which can
bridge transcription factors to the basal transcription apparatus. Cyclin-dependent kinase-8 (CDK8) is a subunit of the Mediator
complex. However, the biological functions of CDK8 remain poorly understood. Here, we identify CDK8 as a negative regulator
of lipogenic gene expression by suppressing the SREBP-1c transcription factor, which is a key activator of rate-limiting enzymes
lipogenesis pathway. CDK8 knockdown in hepatocytes results in SREBP-dependent up-regulation of lipogenic
genes and an increase of lipid accumulation. Transient knockdown of CDK8 in mouse liver
leads to increased expression
of SREBP-target genes. As a result, hepatic CDK8 knockdown causes acceleration of
lipogenesis and accumulation
of neutral lipids in mouse liver. In addition, hepatic CDK8 knockdown in mice results in an increase of plasma triglycerides.
Consistent with the inhibitory role of CDK8 in
lipogenesis, hepatic CDK8 proteins in mouse models of obesity are
significantly lower than normal. Dysregulation of lipid metabolism in obesity causes fatty liver and dyslipidemia, which are
prevalent health problems in the developed countries and are closely associated with type II diabetes and cardiovascular disease.
Thus, CDK8 may play a role in the development of fatty liver and dyslipidemia in obesity.
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