title: The effect of 4'-deoxypyridoxine on rat heart cell cultures under oxygen deficiency.
abstract: The purpose of this work was to study the consequences of an intracellular depletion of pyridoxal-phosphate (PLP) in rat heart cells in culture submitted to oxygen deficiency. Glucose (GLc) and 4'-deoxypyridoxine (DOP) effects were separately evaluated after 150 mn of partial oxygen deprivation (N2) with regard to enzyme leakage, beating rates, intracellular concentrations of PLP and the ratio glycogen phosphorylase activity (-5'-AMP/+5'-AMP). PLP concentrations were higher in the air-GLc group than in the air group. alpha-Hydroxybutyrate dehydrogenase (alpha-HBDH) and creatine kinase (CK) leakages were observed in the N2 group, whereas 1.17 +/- 0.17 mM GLc prevented leakage. Beatings stopped in the N2 group, slightly decreased in the N2-GLc group; the ratio (-5'-AMP/+5'--AMP) increased only in the N2 group. With a 1 mM DOP pretreatment a significant decline of PLP was observed either with or without GLc in the culture medium. The ratio (-5'-AMP/+5'-AMP) was lower in the air-DOP group than in the air group, whereas beatings, alph-HBDH and CK activities were identical to the control group. ImM DOP in the N2-DOP group partially prevented alpha-HBDH and CK leakages into the medium but did not prevent the decrease in contractile activity. Surprisingly, PLP concentration increased in the N2-DOP group/air-DOP group and the increase in ratio (-5'-AMP/+5'-AMP) was higher in the N2-DOP group than in the N2 group when compared to the respective control groups.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D005947:Glucose / Q000378:metabolism; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D009206:Myocardium / Q000201:enzymology / Q000378:metabolism; D010100:Oxygen / Q000494:pharmacology*; D006005:Phosphorylases / Q000378:metabolism; D011732:Pyridoxal Phosphate / Q000494:pharmacology; D011736:Pyridoxine / Q000031:analogs & derivatives* / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011732:Pyridoxal Phosphate; C004675:4-deoxypyridoxine; D006005:Phosphorylases; D005947:Glucose; D011736:Pyridoxine; D010100:Oxygen