کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5892851 | 1153366 | 2007 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Bone sialoprotein expression enhances osteoblast differentiation and matrix mineralization in vitro
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کلمات کلیدی
DMP1TRITCBSPHBSSOPNOCNRUNX2small-hairpin RNAosterixRGDHEKshRNAαMEMSmall Integrin-Binding LIgand N-linked GlycoproteinFBSCbfa-1p.f.u.ECMBSA - BSAβ-Glycerophosphate - β-گلیسروفسفاتArginine-Glycine-Aspartic Acid - آرژینین-گلیسین-اسیدپارشی اسیدbovine serum albumin - آلبومین سرم گاوALP - آلکالن فسفاتازAlkaline phosphatase - آلکالین فسفاتاز یا فسفاتاز قلیاییOsteoblasts - استئوبلاست هاOsteopontin - استئوپنتینOsteocalcin - استئوکلسین Bone mineralization - استخراج کانی سازیOsx - اکسtetramethylrhodamine isothiocyanate - تترامتییل رودامین ایزوتیوسیاناتDifferentiation - تفکیکSibling - خواهر و برادرfetal bovine serum - سرم جنین گاوcytomegalovirus - سیتومگالوویروسCMV - سیتومگالوویروسbone sialoprotein - سیلوپروتئین استخوانRunt-related transcription factor 2 - عامل رونویسی مرتبط با روت 2Extracellular matrix - ماتریکس خارج سلولیHank's buffered salt solution - محلول نمک بافر هانکplaque forming unit - واحد پالک تشکیل شده استdentin matrix protein 1 - پروتئین ماتریکس دنتین 1human embryonic kidney - کلیه جنین انسان
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شناسی تکاملی
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چکیده انگلیسی
Bone sialoprotein (BSP) is an acidic, noncollagenous glycoprotein abundantly expressed in mineralized tissues. Although BSP is frequently used as a marker of osteoblast differentiation, the role of the protein in osteoblast function is unclear. BSP belongs to the SIBLING (Small Integrin-binding LIgand N-linked Glycoprotein) family of RGD-containing matrix proteins, several members of which have been shown to affect cell differentiation. The normal levels of BSP expression in osteoblasts were specifically altered by CMV-mediated adenoviral overexpression in primary osteoblasts or inhibition by an RNA interference-based strategy in the MC3T3E1 cell line. Alternatively, osteoblast cultures were supplemented with recombinant BSP protein. Quantitative real-time PCR was used to monitor the mRNA levels of the osteoblast-related transcription factors Osterix and Runx2 as well as the osteoblast-specific gene osteocalcin. As markers of osteoblast differentiation, alkaline phosphatase enzyme activity, Runx2-luciferase reporter activity and calcein incorporation into mineralized cultures were also measured. The overexpression of BSP increased osteoblast-related gene expression as well as calcium incorporation and nodule formation by osteoblast cultures. Similarly, supplementation of osteoblast cultures with recombinant BSP increased several markers of osteoblast differentiation. Conversely, suppression of BSP expression by small-hairpin RNA-encoding plasmids inhibited expression of osteoblast markers and nodule formation. Overexpression of several functional-domain mutants of BSP demonstrated that increases in osteoblast-related gene expression and matrix mineralization observed in BSP overexpression models are mediated by the integrin-binding RGD motif found near the C-terminus of the protein. These results demonstrate that BSP may serve as a matrix-associated signal directly promoting osteoblast differentiation resulting in the increased production of a mineralized matrix.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bone - Volume 41, Issue 3, September 2007, Pages 462-473
Journal: Bone - Volume 41, Issue 3, September 2007, Pages 462-473
نویسندگان
Jonathan A.R. Gordon, Coralee E. Tye, Arthur V. Sampaio, T. Michael Underhill, Graeme K. Hunter, Harvey A. Goldberg,