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Ultrastructural localization of adenylate cyclase in chicken bone cells

T Yamamoto and CV Gay

Department of Anatomy, School of Dentistry, Okayama University, Japan.

We investigated adenylate cyclase distribution in 6-day-and 3-week-old calvariae and in 6-day-old long bone metaphyses from chickens. Reaction product distribution was on the plasma membrane of osteoblasts, pre- osteoblasts, and forming osteocytes which contacted one another. Osteoclasts and mature osteocytes lacked reaction product. Six-day calvariae reacted less intensely than the other two tissues. In controls, reaction product was markedly diminished or eliminated by removal of forskolin or substrates, or by addition of the inhibitor 2',5'-dideoxyadenosine. The results indicate the importance of cyclic AMP in osteoblast regulation. Osteocytes and osteoclasts may involve alternate mechanisms as major regulatory systems.

Volume 37, Issue 11, pp. 1705-1709, 11/01/1989
Copyright © 1989 by The Histochemical Society


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