| First Author | Smaldone S | Year | 2016 |
| Journal | Matrix Biol | Volume | 52-54 |
| Pages | 88-94 | PubMed ID | 26610678 |
| Mgi Jnum | J:237012 | Mgi Id | MGI:5810515 |
| Doi | 10.1016/j.matbio.2015.11.006 | Citation | Smaldone S, et al. (2016) Fibrillin-1 microfibrils influence adult bone marrow hematopoiesis. Matrix Biol 52-54:88-94 |
| abstractText | We have recently demonstrated that fibrillin-1 assemblies regulate the fate of skeletal stem cells (aka, mesenchymal stem cells [MSCs]) by modulating TGFbeta activity within the microenvironment of adult bone marrow niches. Since MSCs can also influence hematopoietic stem cell (HSC) activities, here we investigated adult hematopoiesis in mice with Cre-mediated inactivation of the fibrillin-1 (Fbn1) gene in the mesenchyme of the forming limbs (Fbn1(Prx1-/-) mice). Analyses of 3-month-old Fbn1(Prx1-/-) mice revealed a statistically significant increase of circulating red blood cells, which a differentiation assay correlated with augmented erythropoiesis. This finding, together with evidence of fibrillin-1 deposition in erythroblastic niches, supported the notion that this extracellular matrix protein normally restricts differentiation of erythroid progenitors. Whereas flow cytometry measurements identified a decreased HSC frequency in mutant relative to wild type mice, no appreciable differences were noted with regard to the relative abundance and differentiation potential of myeloid progenitor cells. Together these findings implied that fibrillin-1 normally promotes HSC expansion but does not influence cell lineage commitment. Since local TGFbeta hyperactivity has been associated with abnormal osteogenesis in Fbn1(Prx1-/-) mice, 1-month-old mutant and wild type animals were systemically treated for 8weeks with either a pan-TGF-beta-neutralizing antibody or an antibody of the same IgG1 isotype. The distinct outcomes of these pharmacological interventions strongly suggest that fibrillin-1 differentially modulates TGFbeta activity in HSC vs. erythroid niches. |
