Hematopoietic defects in response to reduced Arhgap21

Author(s)

Xavier-Ferrucio, Juliana ^{[1, 2, 3]} ; Ricon, Lauremilia ^[1] ; Vieira, Karla ^[1] ; Longhini, Ana Leda ^[1] ; Lazarini, Mariana ^{[4, 1]} ; Bigarella, Carolina Louzao ^[1] ; Franchi, Jr., Gilberto ^[5] ; Krause, Diane S. ^{[2, 3]} ; Saad, Sara T. O. ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Inst Nacl Ciencia & Tecnol Sangue, Hematol & Blood Transfus Ctr, Hemoctr, Campinas, SP - Brazil

^[2] Yale Sch Med, Dept Lab Med, New Haven, CT - USA

^[3] Yale Sch Med, Yale Stem Cell Ctr, New Haven, CT - USA

^[4] Univ Fed Sao Paulo, Dept Biol Sci, Diadema - Brazil

^[5] Univ Campinas UNICAMP, Fac Med Sci, CIPOI, Oncohematol Child Res Ctr, Campinas, SP - Brazil

• Document type: Journal article
• Source: STEM CELL RESEARCH; v. 26, p. 17-27, JAN 2018.
• Web of Science Citations: 9

Abstract

Arhgap21 is a member of the Rho GTPase activating protein (RhoGAP) family, which function as negative regulators of Rho GTPases. Arhgap21 has been implicated in adhesion and migration of cancer cells. However, the role of Arhgap21 has never been investigated in hematopoietic cells. Herein, we evaluated functional aspects of hematopoietic stem and progenitor cells (HSPC) using a haploinsufficient (Arhgap21(+/-)) mouse. Our results show that Arhgap21(+/-) mice have an increased frequency of phenotypic HSC, impaired ability to form progenitor colonies in vitro and decreased hematopoietic engraftment in vivo, along with a decrease in LSK cell frequency during serial bone marrow transplantation. Arhgap21(+/-) hematopoietic progenitor cells have impaired adhesion and enhanced mobilization of immature LSK and myeloid progenitors. Arhgap21(+/-) mice also exhibit reduced erythroid commitment and differentiation, which was recapitulated in human primary cells, in which knockdown of ARHGAP21 in CMP and MEP resulted in decreased erythroid commitment. Finally, we observed enhanced RhoC activity in the bone marrow cells of Arhgap21(+/-) mice, indicating that Arhgap21 functions in hematopoiesis may be at least partially mediated by RhoC inactivation. (c) 2017 The Authors. Published by Elsevier B.V. (AU)

• FAPESP's process: 09/08908-6 - Role of ARHGAP21 in the migration and adhesion of hematopoietic progenitor cells in bone marrow niches
• Grantee: Lauremília Ricon Gomes Rodrigues da Costa
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/51959-0 - Biology of neoplastic diseases of bone marrow
• Grantee: Sara Teresinha Olalla Saad
• Support Opportunities: Research Projects - Thematic Grants