title: Nicotinamide adenine dinucleotide levels in chick limb mesodermal cells in vitro: effects of 3-acetylpyridine and nicotinamide.
abstract: The studies reported here show that in cultures of developing mesodermal cells, chondrogenic expression is associated with a progressive decline in cellular NAD+ levels. Furthermore, reduced cellular NAD+ levels resulting from exposure to the nicotinamide analog 3-acetylpyridine are correlated with a 2- to 100-fold potentiation of chondrogenic expression. Conversely, elevated NAD+ levels resulting from exposure to nicotinamide alone are correlated with inhibition of chondrogenic expression. These data are consistent with the hypothesis that pyridine nucleotides, or some derivative thereof, play a central role in the control of muscle and cartilage development in embryonic chick limbs.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002642:Chick Embryo; D004247:DNA / Q000096:biosynthesis; D008648:Mesoderm / Q000378:metabolism*; D009243:NAD / Q000378:metabolism*; D009536:Niacinamide / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*
chemical_list: D011725:Pyridines; D009243:NAD; D009536:Niacinamide; D004247:DNA