Changes in E-NTPDase 3 expression and extracellular nucleotide hydrolysis during the myofibroblast/lipocyte...

Area of Science:

• Hepatology
• Cell Biology
• Biochemistry

Background:

• Hepatic stellate cells (HSC) are key players in liver fibrosis development.
• Ecto-nucleoside triphosphate diphosphohydrolases (E-NTPDases) regulate extracellular nucleotides involved in fibrosis pathogenesis.

Purpose of the Study:

• To identify and compare E-NTPDase family expression in mouse hepatic stellate cell line (GRX) phenotypes.
• To evaluate nucleotide hydrolysis activity in different GRX cell phenotypes.

Main Methods:

• Expression analysis of E-NTPDase family members in GRX cell lines.
• Assessment of triphospho- and diphosphonucleotide hydrolysis by GRX cells.

Main Results:

• Both quiescent-like and activated GRX cells expressed NTPDase 3 and 5.
• Activated GRX cells uniquely expressed NTPDase 6.
• Quiescent-like cells showed higher triphosphonucleoside hydrolysis, linked to increased Entpd3 mRNA.
• Diphosphonucleoside hydrolysis rates were similar between cell phenotypes.

Conclusions:

• Entpd3 mRNA upregulation in quiescent HSC modulates nucleotide/nucleoside levels.
• Altered nucleotide signaling via P2 receptors may influence HSC functions in liver fibrosis.