期刊
JOURNAL OF CELL BIOLOGY
卷 194, 期 2, 页码 307-322出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201007108
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资金
- Ministere de la Recherche et Technologie
- Association pour la Recherche sur le Cancer
- Pro-A Institut National de la Sante et de la Recherche Medicale
- Ligue Contre le Cancer
- National Institutes of Health [HL21644]
- Max Planck Society
- University of Heidelberg
- Association pour la Recherche sur le Cancer and Region Rhone-Alpes
- Ligue Nationale Contre le Cancer as Equipe Labellisee Ligue
The morphogenetic and differentiation events required for bone formation are orchestrated by diffusible and insoluble factors that are localized within the extracellular matrix. In mice, the deletion of ICAP-1, a modulator of beta 1 integrin activation, leads to severe defects in osteoblast proliferation, differentiation, and mineralization and to a delay in bone formation. Deposition of fibronectin and maturation of fibrillar adhesions, adhesive structures that accompany fibronectin deposition, are impaired upon ICAP-1 loss, as are type I collagen deposition and mineralization. Expression of beta 1 integrin with a mutated binding site for ICAP-1 recapitulates the ICAP-1-null phenotype. Follow-up experiments demonstrated that ICAP-1 negatively regulates kindlin-2 recruitment onto the beta 1 integrin cytoplasmic domain, whereas an excess of kindlin-2 binding has a deleterious effect on fibrillar adhesion formation. These results suggest that ICAP-1 works in concert with kindlin-2 to control the dynamics of beta 1 integrin-containing fibrillar adhesions and, thereby, regulates fibronectin deposition and osteoblast mineralization.
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