Insight into the function of the Golgi membrane protein GOLM1 in cholangiocytes through interactomic analysis

Area of Science:

• Cell Biology
• Molecular Biology
• Hepatology

Background:

• Golgi matrix protein 1 (GOLM1) is a Golgi membrane protein implicated in cancers and liver diseases.
• GOLM1 is predominantly expressed in cholangiocytes within the healthy human liver.

Purpose of the Study:

• To elucidate the molecular functions of GOLM1 in cholangiocytes.
• To identify GOLM1-interacting proteins and their roles in cellular processes.

Main Methods:

• Protein interactomics to identify GOLM1 partners.
• RNA sequencing data analysis of healthy human liver.
• GOLM1 gene silencing in MMNK-1 cholangiocytes.
• Assessment of cellular functions including mitochondrial activity, apoptosis, and cell adhesion.

Main Results:

• Identified putative GOLM1 interactors involved in mitochondrial and Golgi functions, ribonucleoprotein biogenesis, cell cycle, and basement membrane organization.
• GOLM1 silencing led to impaired mitochondrial function and reduced mitochondrial markers.
• Silencing also decreased P-body markers, increased apoptosis, and reduced cell adhesion.

Conclusions:

• GOLM1 plays critical roles in maintaining cholangiocyte metabolism and cellular functions.
• GOLM1 is essential for mitochondrial integrity, proper P-body formation, and cell adhesion in cholangiocytes.