Heightened TPD52 linked to metabolic dysfunction and associated abnormalities in zebrafish

Area of Science:

• Molecular Biology
• Metabolic Research
• Oncology

Background:

• Tumor protein D52 (TPD52) is a proto-oncogene implicated in various cancers.
• TPD52's role in cell growth, differentiation, and apoptosis is known, but its in vivo function in lipid metabolism remains unclear.
• Previous studies explored TPD52's role in lipid droplet biosynthesis in vitro.

Purpose of the Study:

• To investigate the in vivo functions of TPD52 in lipid metabolism and associated diseases.
• To elucidate the role of TPD52 in adipogenesis and metabolic regulation using a zebrafish model.

Main Methods:

• Established conditionally expressed Tpd52 transgenic zebrafish using a Tet-off system.
• Assessed lipogenesis via Oil Red O staining, histological examination, and gene/protein expression analysis (qPCR, immunoblotting).
• Measured inflammatory markers and identified the activated protein kinase pathway as a TPD52 target.

Main Results:

• TPD52 overexpression in zebrafish resulted in significant weight gain and enlarged fat deposits due to increased adipocyte volume.
• TPD52 triggered the adipocyte differentiation signaling pathway, leading to adipogenesis.
• Transgenic zebrafish developed nonalcoholic fatty liver disease and metabolic cardiomyopathy (MCM) with increased lipid accumulation and visceral obesity.

Conclusions:

• TPD52 actively contributes to adipose tissue expansion and related metabolic disorders.
• TPD52 facilitates adipocyte development and promotes comorbidities such as nonalcoholic fatty liver disease and metabolic cardiomyopathy.
• The activated protein kinase pathway is a key target through which TPD52 exerts its effects on lipid metabolism.