| First Author | Lapid K | Year | 2013 |
| Journal | J Clin Invest | Volume | 123 |
| Issue | 4 | Pages | 1705-17 |
| PubMed ID | 23478410 | Mgi Jnum | J:197537 |
| Mgi Id | MGI:5493348 | Doi | 10.1172/JCI64149 |
| Citation | Lapid K, et al. (2013) GSK3beta regulates physiological migration of stem/progenitor cells via cytoskeletal rearrangement. J Clin Invest 123(4):1705-17 |
| abstractText | Regulation of hematopoietic stem and progenitor cell (HSPC) steady-state egress from the bone marrow (BM) to the circulation is poorly understood. While glycogen synthase kinase-3beta (GSK3beta) is known to participate in HSPC proliferation, we revealed an unexpected role in the preferential regulation of CXCL12-induced migration and steady-state egress of murine HSPCs, including long-term repopulating HSCs, over mature leukocytes. HSPC egress, regulated by circadian rhythms of CXCL12 and CXCR4 levels, correlated with dynamic expression of GSK3beta in the BM. Nevertheless, GSK3beta signaling was CXCL12/CXCR4 independent, suggesting that synchronization of both pathways is required for HSPC motility. Chemotaxis of HSPCs expressing higher levels of GSK3beta compared with mature cells was selectively enhanced by stem cell factor-induced activation of GSK3beta. Moreover, HSPC motility was regulated by norepinephrine and insulin-like growth factor-1 (IGF-1), which increased or reduced, respectively, GSK3beta expression in BM HSPCs and their subsequent egress. Mechanistically, GSK3beta signaling promoted preferential HSPC migration by regulating actin rearrangement and microtubuli turnover, including CXCL12-induced actin polarization and polymerization. Our study identifies a previously unknown role for GSK3beta in physiological HSPC motility, dictating an active, rather than a passive, nature for homeostatic egress from the BM reservoir to the blood circulation. |
