Hepatic Mcpip1 regulates adaptation to food restriction in mice

Area of Science:

• Molecular Biology
• Metabolic Research
• Endocrinology

Background:

• Monocyte-chemoattractant protein-induced protein 1 (MCPIP1, also known as Regnase-1) is an endoribonuclease regulating mRNA stability.
• MCPIP1 is recognized for its anti-inflammatory roles and its influence on adipogenesis and lipid metabolism.
• The function of MCPIP1 in hepatic (liver) cell metabolism and its role in fasting adaptation are not well understood.

Purpose of the Study:

• To investigate the role of MCPIP1 in liver epithelial cells during adaptation to a 24-hour food restriction period.
• To characterize the metabolic consequences of MCPIP1 deficiency in the liver.

Main Methods:

• Conditional deletion of the Zc3h12a gene (encoding MCPIP1) in murine liver epithelial cells (Mcpip1fl/flAlbCre mice).
• Assessment of blood glucose levels in fasted Mcpip1fl/flAlbCre mice compared to control (Mcpip1fl/fl) mice.
• Hepatic proteome analysis to identify differentially expressed proteins in Mcpip1-deficient livers.

Main Results:

• Mice with MCPIP1 deficiency in liver cells exhibited elevated blood glucose levels following fasting.
• Hepatic proteome analysis revealed significant alterations in protein expression, with 26 proteins down-regulated and 117 up-regulated in Mcpip1-deficient livers.
• Affected proteins were predominantly involved in cellular adhesion, extracellular matrix remodeling, and various metabolic processes.

Conclusions:

• MCPIP1 plays a crucial role in the metabolic adaptation of liver epithelial cells to fasting.
• MCPIP1 deficiency in hepatocytes impacts glucose homeostasis and alters the expression of proteins involved in cellular structure and metabolism.
• These findings provide novel insights into the hepatic functions of MCPIP1 and its contribution to metabolic control.