Inactivation of G-protein-coupled receptor 48 (Gpr48/Lgr4) impairs definitive erythropoiesis at midgestation through down-regulation of the ATF4 signaling pathway.

ABSTRACT: G-protein-coupled receptors (GPCRs), one of the most versatile groups of cell surface receptors, can recognize specific ligands from neural, hormonal, and paracrine organs and regulate cell growth, proliferation, and differentiation. Gpr48/LGR4 is a recently identified orphan GPCR with unknown functions. To reveal the functions of Gpr48 in vivo, we generated Gpr48-/- mice and found that Gpr48-/- fetuses displayed transient anemia during midgestation and abnormal definitive erythropoiesis. The dramatic decrease of definitive erythroid precursors (Ter119pos population) in Gpr48-/- fetal liver at E13.5 was confirmed by histological analysis and blood smear assays. Real-time PCR analyses showed that in Gpr48-/- mice both adult hemoglobin alpha and beta chains were decreased while embryonic hem

SUBMITTER: Song H 

PROVIDER: S-EPMC2605983 | biostudies-literature | 2008 Dec

REPOSITORIES: biostudies-literature