Abstract:
:The expression of matrix metalloproteinase-13 (MMP-13), involved in bone turnover, is elevated in stretched MC3T3-E1 osteoblast-like cells. Strain-mediated forces impact bone remodeling due in large part to the movement of fluid through the canalicular-lacunar network. The resulting fluid shear stress (FSS) over the surface membranes of bone cells initiates bone remodeling. Although the nuclear events mediating putative FSS-induced changes in osteoblast MMP-13 transcription are unknown, previous studies with bone cells suggest an overlap between osteoblast FSS- and PTH-induced signal response pathways. MMP-13 PTH response is regulated by a 110 bp 5' regulatory region, conserved across the mouse, rat, and human genes, that supports the binding of numerous transcription factors including Runx2, c-fos/c-jun, Ets-1, and nuclear matrix protein 4/cas interacting zinc finger protein (Nmp4/CIZ) a nucleocytoplasmic shuttling trans-acting protein that attenuates PTH-driven transcription. Nmp4/CIZ also binds p130(cas), an adaptor protein implicated in mechanotransduction. Here we sought to determine whether Nmp4/CIZ contributes to FSS-induced changes in MMP-13 transcription. FSS (12 dynes/cm(2), 3-5 h) increased MMP-13 promoter-reporter activity approximately two-fold in MC3T3-E1 osteoblast-like cells attended by a comparable increase in mRNA expression. This was accompanied by a decrease in Nmp4/CIZ binding to its cis-element within the PTH response region, the mutation of which abrogated the MMP-13 response to FSS. Interestingly, FSS enhanced Nmp4/CIZ promoter activity and induced p130(cas) nuclear translocation. We conclude that the PTH regulatory region of MMP-13 also contributes to FSS response and that Nmp4/CIZ plays similar but distinct roles in mediating hormone- and FSS-driven induction of MMP-13 in bone cells.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Charoonpatrapong-Panyayong K,Shah R,Yang J,Alvarez M,Pavalko FM,Gerard-O'Riley R,Robling AG,Templeton E,Bidwell JPdoi
10.1002/jcb.21349subject
Has Abstractpub_date
2007-12-01 00:00:00pages
1202-13issue
5eissn
0730-2312issn
1097-4644journal_volume
102pub_type
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