Journal
CELLULAR AND MOLECULAR LIFE SCIENCES
Volume 72, Issue 15, Pages 2853-2867Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00018-015-1963-6
Keywords
Bone; Cartilage; Tendon; Ligament; Connexin; Pannexin
Categories
Funding
- National Institutes of Health [R01-AR053643, R01-AR067210, R01-AR063631]
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Regulation of bone homeostasis depends on the concerted actions of bone-forming osteoblasts and bone-resorbing osteoclasts, controlled by osteocytes, cells derived from osteoblasts surrounded by bone matrix. The control of differentiation, viability and function of bone cells relies on the presence of connexins. Connexin43 regulates the expression of genes required for osteoblast and osteoclast differentiation directly or by changing the levels of osteocytic genes, and connexin45 may oppose connexin43 actions in osteoblastic cells. Connexin37 is required for osteoclast differentiation and its deletion results in increased bone mass. Less is known on the role of connexins in cartilage, ligaments and tendons. Connexin43, connexin45, connexin32, connexin46 and connexin29 are expressed in chondrocytes, while connexin43 and connexin32 are expressed in ligaments and tendons. Similarly, although the expression of pannexin1, pannexin2 and pannexin3 has been demonstrated in bone and cartilage cells, their function in these tissues is not fully understood.
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