Title: Regulator of G-protein signaling 18 controls megakaryopoiesis and the cilia-mediated vertebrate mechanosensory system
Authors: Louwette, Sophie
Labarque, Veerle
Wittevrongel, Christine
Thys, Chantal
Metz, Juriaan
Gijsbers, Rik
Debyser, Zeger
Arnout, Jozef
Van Geet, Chris
Freson, Kathleen # ×
Issue Date: May-2012
Publisher: The Federation of American Societies for Experimental Biology
Series Title: FASEB Journal vol:26 issue:5 pages:2125-2136
Abstract: RGS18 was originally identified as a R4 subfamily member of regulators of G-protein signaling (RGS) with specific expression in hematopoietic progenitors, myeloerythroid cells, and megakaryocytes, though its physiological role in hematopoiesis remained unknown. Here, we show that lentiviral RGS18 overexpression during differentiation of mouse Sca1(+) hematopoietic stem cells induced a 50% increase of megakaryocyte proliferation. RGS18 depletion in zebrafish results in thrombocytopenia, as 66 to 88% of the embryos lack thrombocytes after injection of an ATG or splice-blocking morpholino, respectively. These embryos have no defects in early hematopoiesis, erythropoiesis, or leukocyte number and migration. In addition, all RGS18 depleted embryos have curly tails and an almost absent response to acoustic stimuli. In situ hybridization in zebrafish, Xenopus, and mouse embryos shows RGS18 expression in thrombocytes and/or hematological tissues but also in brain and otic vesicles. RGS18 interferes with development of cilia in hair cells of the inner ear and neuromast cells. On the basis of literature evidence that RGS-R4 members interact with the G-protein-modulated Wnt/calcium pathway, Wnt5b- but not Wnt5a-depleted embryos phenocopy all RGS18 knockdown effects. In summary, our study is the first to show that RGS18 regulates megakaryopoiesis but also reveals its unexpected role in ciliogenesis, at least in lower vertebrates, via interference with Wnt signaling.-Louwette, S., Labarque, V., Wittevrongel, C., Thys, C., Metz, J., Gijsbers, R., Debyser, Z., Arnout, J., Van Geet, C., Freson, K. Regulator of G-protein signaling 18 controls megakaryopoiesis and the cilia-mediated vertebrate mechanosensory system.
ISSN: 0892-6638
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular and Vascular Biology
Animal Research Center
Molecular Virology and Gene Therapy
Biomedical Sciences Group Management - miscellaneous
Department of Cardiovascular Sciences - miscellaneous
× corresponding author
# (joint) last author

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