title: Changes in cyclic AMP and cyclic GMP levels during in vitro chondrogenesis.
abstract: cAMP and cGMP levels were measured in micro high-density cultures of chick limb bud mesenchyme cells stages 22-24 after 1, 2, 4 and 6 days of culturing. In these cultures, a consistent cartilage differentiation proceeds parallel to the progressive accumulation of cells in the G0 phase. The cAMP level increased by 45% by the time of the onset of cartilage phenotype expression, and significantly decreased thereafter. The cGMP level gradually diminished by a total of 39% during the period examined. It is suggested that the decrease in cell proliferation may be the consequence of the reduction of the cGMP level, and that a short-term marked elevation of cAMP level induces cartilage differentiation in the limb mesenchymal cells which are able to select only from a limited number of differentiation programmes.
mesh_terms: D000818:Animals; D002356:Cartilage / Q000166:cytology / Q000196:embryology*; D002454:Cell Differentiation; D002478:Cells, Cultured; D002642:Chick Embryo; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D005121:Extremities / Q000196:embryology; D008648:Mesoderm / Q000166:cytology; D013997:Time Factors
chemical_list: D004247:DNA; D000242:Cyclic AMP; D006152:Cyclic GMP