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ACETYLATION PHENOTYPE AS A SUSCEPTIBILITY MARKER FOR DEVELOPMENT OF NITRATE-CADMIUM INTOXICATION IN YOUNG RATS.

T Kmet1, L Vlasyk1, T Hrachova1

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Slow acetylator rats exhibit increased susceptibility to combined sodium nitrate and cadmium chloride toxicity, indicated by oxidative stress markers and behavioral changes. This highlights acetylation phenotype as a key biomarker for chemical substance effects.

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Area of Science:

  • Toxicology
  • Biochemistry
  • Pharmacogenetics

Background:

  • Acetylation phenotype influences individual susceptibility to xenobiotics.
  • Oxidative stress and central nervous system (CNS) function are critical toxicological endpoints.
  • Combined exposure to environmental toxicants like sodium nitrate and cadmium chloride poses health risks.

Purpose of the Study:

  • To investigate the combined effects of sodium nitrate and cadmium chloride on prooxidant-antioxidant balance and CNS function in young rats.
  • To determine if acetylation type (rapid vs. slow) modifies susceptibility to these toxicants.
  • To identify specific biomarkers of toxicity associated with different acetylation phenotypes.

Main Methods:

  • Experimental study on immature male rats (1.5 months old) divided into 'rapid' and 'slow' acetylator groups based on sulfadimine excretion.
  • Subgroups received either a control diet or a 14-day administration of sodium nitrate (1/15 DL50) and cadmium chloride (1/150 DL50).
  • Assessed blood and liver prooxidant-antioxidant balance (e.g., protein peroxide oxidation, methemoglobin, lipoperoxidation products) and central nervous system function (behavioral activity).

Main Results:

  • 'Slow' acetylators showed increased susceptibility, evidenced by a 25% rise in protein peroxide oxidation, 34% increase in average molecular peptides, 30% increase in ceruloplasmin, and a 6.7-fold increase in methemoglobin.
  • Nitrate-cadmium intoxication inhibited integral behavioral activity in both acetylator types.
  • 'Slow' acetylators' disturbed behavior was linked to increased liver lipoperoxidation products, while 'rapid' acetylators' was associated with increased oxidation-modification proteins.

Conclusions:

  • Acetylation phenotype, particularly 'slow' acetylation, serves as a susceptibility biomarker to the harmful effects of combined sodium nitrate and cadmium chloride exposure in young rats.
  • Specific oxidative stress markers and behavioral changes can differentiate toxicity impacts based on acetylation type.
  • Understanding acetylation-dependent toxicity is crucial for risk assessment of chemical substances.