Abstract:
:NELL-1 (Nel-like molecule-1) is a secreted osteogenic growth factor first identified in human craniosynostosis (CS) patients. NELL-1 protein has been observed to promote bone and cartilage differentiation and to suppress adipogenesis in both in vitro and in vivo models. Despite these findings, the cell surface receptors of NELL-1 have remained unknown. In this study, we observed for the first time that NELL-1 promotes cell adherence in multiple cell lines, including ST2, C3H10T1/2, M2-10B4, ATDC5, and MC3T3 cells. Additionally, we found that NELL-1 binds to extracellular Integrinβ1 and induces cell focal adhesion. By utilizing siRNA methods, we determined that NELL-1 cell surface binding and enhanced cell attachment were dependent on Integrinβ1 expression. Finally, we observed that pre-coating of culture dishes or PLGA (polylactic-co-glycolic acid) scaffold with NELL-1 resulted in a significant increase in both cell attachment and osteogenic differentiation. Our results identify for the first time a cell surface target of NELL-1, Integrinβ1, and elucidate new functions of NELL-1 in promoting cell adherence and osteogenic differentiation.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Shen J,James AW,Chung J,Lee K,Zhang JB,Ho S,Lee KS,Kim TM,Niimi T,Kuroda S,Ting K,Soo Cdoi
10.1002/jcb.24253subject
Has Abstractpub_date
2012-12-01 00:00:00pages
3620-8issue
12eissn
0730-2312issn
1097-4644journal_volume
113pub_type
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