DUSP8-attenuated ERK1/2 signaling mediates lipogenesis and steroidogenesis in chicken granulosa cells

Area of Science:

• Reproductive Biology
• Cellular Metabolism
• Molecular Endocrinology

Background:

• Granulosa cell lipogenesis and steroidogenesis are vital for follicular development.
• The precise role of dual-specificity phosphatase 8 (DUSP8) in these processes is not well understood.
• Investigating DUSP8's function can elucidate key regulatory mechanisms in avian reproduction.

Purpose of the Study:

• To determine the specific role of DUSP8 in regulating lipogenesis and steroidogenesis in chicken granulosa cells.
• To investigate the molecular pathway through which DUSP8 exerts its effects.
• To enhance understanding of lipid metabolism and progesterone synthesis during follicular development.

Main Methods:

• Primary chicken granulosa cells were cultured in vitro.
• DUSP8 was overexpressed and knocked down to assess its functional impact.
• Gene expression of adipogenic and steroidogenic markers was quantified.
• Lipid deposition and progesterone synthesis were measured.
• Extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation was analyzed.

Main Results:

• DUSP8 overexpression increased adipogenic gene expression and lipid deposition.
• DUSP8 knockdown reduced adipogenic gene expression and lipid deposition.
• DUSP8 overexpression enhanced steroidogenic gene expression and progesterone synthesis.
• DUSP8 knockdown inhibited steroidogenic gene expression and progesterone synthesis.
• DUSP8 was found to inhibit ERK1/2 phosphorylation.

Conclusions:

• DUSP8 plays a significant role in promoting both lipogenesis and steroidogenesis in chicken granulosa cells.
• DUSP8 mediates these effects via the extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway.
• These findings provide novel insights into the molecular regulation of lipid metabolism and progesterone production in avian granulosa cells.