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Journal of Histochemistry and Cytochemistry, Vol. 50, 1341-1350, October 2002, Copyright © 2002, The Histochemical Society, Inc.

ARTICLE

Immunohistochemical Localization of Osteogenetic Protein (OP-1) and Its Receptors in Rabbit Articular Cartilage

Carol Muehlemana,b, Klaus E. Kuettnerb,c, David C. Ruegere, Peter ten Dijkef, and Susan Chubinskayab,d
a Departments of Anatomy, Rush Medical College, Chicago, Illinois
b Biochemistry, Rush Medical College, Chicago, Illinois
c Orthopedic Surgery, Rush Medical College, Chicago, Illinois
d Rheumatology, Rush Medical College, Chicago, Illinois
e Stryker Biotech, Hopkinton, Massachusetts
f Division of Cellular Biochemistry, The Netherlands Cancer Institute, Amsterdam, The Netherlands

Correspondence to: Carol Muehleman, Dept. of Anatomy, Rush Medical College, 600 S. Paulina, ACFAC 507, Chicago, IL 60612. E-mail: cmuehleman@rushu.rush.edu

We assessed the distribution and relative immunohistochemical staining intensity of the bone morphogenetic protein-7, osteogenic protein-1 (OP-1), in its pro- and mature forms, and four of its receptors, type I (ALK-2, ALK-3, and ALK-6) and type II in normal adolescent New Zealand White rabbit articular cartilage. Expression of the protein and its receptors was also examined in cartilage from joints that had been previously subjected to cartilage matrix degradation. Pro-OP-1 was moderately expressed in chondrocytes of the superficial, middle, and deep cartilage zones and in the osteocytes. The expression of mature OP-1 was similar, with the exception of less staining in the superficial zone of cartilage. Expression of these two forms of OP-1 was enhanced in the middle and deep cartilage zones after catabolic challenge. The type I receptor, ALK-6, displayed the strongest staining of the receptors in both cartilage and bone, whereas ALK-2 displayed the weakest staining. No differences were observed in the receptor staining levels after catabolic challenge. This study shows that OP-1 and its receptors have been identified in rabbit articular cartilage and bone, suggesting a possible role for this pathway in cartilage and bone homeostasis. (J Histochem Cytochem 50:1341–1349, 2002)

Key Words: osteogenic protein-1, bone morphogenetic protein, cartilage, OP-1 receptors


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C. Merrihew, S. Soeder, D. C. Rueger, K. E. Kuettner, and S. Chubinskaya
Modulation of Endogenous Osteogenic Protein-1 (OP-1) by Interleukin-1 in Adult Human Articular Cartilage
J. Bone Joint Surg. Am., August 1, 2003; 85(90003): 67 - 74.
[Abstract] [Full Text] [PDF]



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