Pluto Bioinformatics

GSE144018: Prom1-deficiency effects on mouse primary hepatocyte transcriptomes in serum-free condition

Bulk RNA sequencing

Purpose: The function of Prom1, a penta-transmembrane glycoprotein which is a used as cancer stem cell marker, in the liver is unclear. The goal of this study is to examine the effect of Prom1 -/- in mouse primary hepatocyte transcriptomes.; Prominin-1 (Prom1) is a major cell surface marker of cancer stem cells, but its physiological functions in the liver have not been elucidated. We analyzed the levels of mRNA transcripts in serum-starved primary Prom1+/+ and Prom1-/- mouse hepatocytes using RNA-sequencing (RNA-seq) data, and found that CREB target genes were down-regulated. This initial observation led us to determine that the Prom1 deficiency inhibited cAMP response element binding protein (CREB) activation and gluconeogenesis, but not cyclic AMP (cAMP) accumulation, in glucagon-, epinephrine-, or forskolin-treated liver tissues and primary hepatocytes, and mitigated glucagon-induced hyperglycemia. Because Prom1 interacted with radixin, the Prom1 deficiency prevented radixin from localizing to the plasma membrane. Moreover, systemic adenoviral knockdown of radixin inhibited CREB activation and gluconeogenesis in glucagon-treated liver tissues and primary hepatocytes, and mitigated glucagon-elicited hyperglycemia. Based on these results, we conclude that Prom1 regulates hepatic PKA signaling via radixin functioning as an A kinase-anchored protein (AKAP). SOURCE: Young-Gyu Ko (ygko@korea.ac.kr) - Korea University