GSBS Student Publications

Title

BMP-5 expression increases during chondrocyte differentiation in vivo and in vitro and promotes proliferation and cartilage matrix synthesis in primary chondrocyte cultures

UMMS Affiliation

Graduate School of Biomedical Sciences; Department of Cell Biology; Department of Orthopedics; Department of Pathology

Date

6-2-2007

Document Type

Article

Medical Subject Headings

Animals; Bone Morphogenetic Protein 5; Bone Morphogenetic Proteins; Calcification, Physiologic; Cartilage, Articular; Cell Differentiation; *Cell Proliferation; Cells, Cultured; Chondrocytes; Extracellular Matrix; Glycosaminoglycans; Immunohistochemistry; Rats; Ribs

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Bone morphogenetic proteins (BMPs) play pivotal roles in bone and cartilage growth and repair. Through phenotypes of short-ear (se) mice, which have BMP-5 mutations, a role for BMP-5 in some specific aspects of skeletogenesis and cartilage growth is known. This report examines BMP-5 expression in the growth plate and in differentiating cultures of primary chondrocytes, and the effects of addition of BMP-5 or its inhibition by anti-BMP-5 antibody in chondrocyte cultures. By laser capture microdissection and immunohistochemistry, we found that BMP-5 is expressed in proliferating zone (PZ) chondrocytes and that the expression increases sharply with hypertrophic differentiation. A similar pattern was observed in differentiating cultures of primary chondrocytes, with BMP-5 expression increasing as cells differentiated, in contrast to other BMPs. BMP-5 added to cultures increased cell proliferation early in the culture period and also stimulated cartilage matrix synthesis. Also, BMP-5 addition to the cultures activated phosphorylation of Smad 1/5/8 and p38 MAP kinase and caused increased nuclear accumulation of phospho-Smads. Anti-BMP-5 antibody inhibited the endogenous BMP-5, reducing cell proliferation and phospho-Smad nuclear accumulation. Together, the results demonstrate that BMP-5 is normally an important regulator of chondrocyte proliferation and differentiation. Whether other BMPs may compensate in BMP-5 loss-of-function mutations is discussed.

Rights and Permissions

Citation: J Cell Physiol. 2008 Jan;214(1):56-64. Link to article on publisher's site

DOI of Published Version

10.1002/jcp.21164

Related Resources

Link to Article in PubMed

Journal Title

Journal of cellular physiology

PubMed ID

17541940