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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)
Insights
Intracellular pyridoxal-phosphate (PLP) depletion in rat heart cells under oxygen deficiency led to enzyme leakage and stopped beating. Glucose partially protected cells, while 4'-deoxypyridoxine (DOP) affected PLP levels and enzyme activity.
Area of Science:
- Biochemistry
- Cell Biology
- Physiology
Background:
- Pyridoxal-phosphate (PLP) is crucial for cellular metabolism.
- Oxygen deficiency (hypoxia) severely impacts heart cell function.
- Understanding nutrient and cofactor roles during stress is vital for cardiac health.
Purpose of the Study:
- To investigate the effects of intracellular pyridoxal-phosphate (PLP) depletion on rat heart cells under oxygen deficiency.
- To evaluate the impact of glucose (GLc) and 4'-deoxypyridoxine (DOP) on cellular integrity and function during hypoxia.
Main Methods:
- Rat heart cells in culture were subjected to partial oxygen deprivation (N2).
- Effects of glucose (GLc) and 4'-deoxypyridoxine (DOP) were assessed.
- Measurements included enzyme leakage (alpha-HBDH, CK), beating rates, intracellular PLP concentrations, and glycogen phosphorylase activity ratio.
Main Results:
- Oxygen deficiency caused enzyme leakage and cessation of beating.
- Glucose (GLc) prevented enzyme leakage and partially maintained beating.
- 4'-deoxypyridoxine (DOP) pretreatment depleted intracellular PLP but offered partial protection against enzyme leakage during hypoxia, without fully restoring contractile function.
Conclusions:
- Intracellular PLP depletion exacerbates cellular damage during oxygen deficiency.
- Glucose provides a protective effect against hypoxia-induced cardiac cell injury.
- Targeting PLP metabolism may offer therapeutic avenues for cardiac protection, though complex interactions exist.