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Inhibition of nitric oxide synthesis enhances teratogenic effects induced by valproic Acid

Gian Mario Tiboni1, Francesco Chiarelli, Alberto Verrotti

  • 1Department of Medicine and Aging Sciences, Faculty of Medicine, University G. d'Annunzio of Chieti-Pescara, Ortona, Italy. tiboni@unich.it

In Vivo (Athens, Greece)
|July 2, 2013
PubMed
Abstract

Insights

Nitric oxide (NO) deprivation enhances valproic acid (VPA) teratogenicity. Inhibiting NO synthesis alongside VPA treatment significantly increased fetal malformations, including skeletal defects and exencephaly in mice.

Area of Science:

  • Developmental toxicology
  • Pharmacology
  • Teratology

Background:

  • Valproic acid (VPA) is a known teratogen, but its precise mechanism of action is not fully understood.
  • Nitric oxide (NO) plays a crucial role in various physiological processes, including embryonic development.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) deprivation in valproic acid (VPA)-induced teratogenicity.
  • To determine if inhibiting NO synthesis exacerbates VPA's harmful effects on fetal development.

Main Methods:

  • Pregnant mice were administered N(G)-nitro-L-arginine methyl ester (L-NAME), a nitric oxide synthase (NOS) inhibitor, followed by a teratogenic dose of VPA.
  • Developmental endpoints were assessed near the end of gestation to evaluate fetal malformations.

Main Results:

  • Co-administration of L-NAME with VPA (400 mg/kg) significantly increased skeletal teratogenesis from 35.2% to 53.7%.
  • L-NAME pre-treatment elevated the incidence of exencephaly from 5.4% to 22.2% in fetuses exposed to VPA (500 mg/kg).

Conclusions:

  • Inhibition of NO synthesis potentiates VPA-induced teratogenesis.
  • These findings suggest that NO plays a protective role against VPA's developmental toxicity.
Keywords:
Valproic acidaxial skeletal defectsneural tube defectsnitric oxide synthesis inhibitionteratogenicityteratological interaction

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