Mesoderm-specific transcript (MEST) is a negative regulator of human adipocyte differentiation

Area of Science:

• Metabolic research
• Adipose tissue biology
• Obesity pathogenesis

Background:

• Obesity-related diseases are linked to molecular changes in white adipose tissue (WAT).
• Excessive adipocyte expansion can be counteracted by increasing adipocyte recruitment (adipogenesis).
• Mesoderm-specific transcript (MEST) correlates with adiposity and adipocyte size in mice.

Purpose of the Study:

• To characterize MEST expression and function in human white adipose tissue and adipogenesis.
• To investigate the role of MEST in human adipocyte differentiation.

Main Methods:

• Analysis of human WAT samples.
• In vitro adipogenesis model using human multipotent adipose-derived stem cells.
• MEST gene knockdown and overexpression experiments.
• Measurement of MEST mRNA and protein levels.
• Analysis of key signaling pathways (PPAR, CREB, ATF1) and metabolic processes.

Main Results:

• MEST levels increase during human adipocyte differentiation and are higher in obese individuals, correlating with adipocyte volume.
• MEST knockdown enhances human adipogenesis, promoting PPAR signaling, glycolysis, and fatty acid biosynthesis.
• MEST overexpression impairs adipogenesis.
• MEST silencing replaces the need for IBMX in inducing adipogenesis.
• MEST knockdown significantly increases phosphorylation of CREB and ATF1.

Conclusions:

• MEST acts as an inhibitor of human adipogenesis, contrasting with findings in murine models.
• A novel link between MEST and the CREB/ATF1 pathway in metabolic regulation is established.
• These findings have potential relevance for understanding and treating obesity-associated diseases.