EFFECT OF DICHLORVOS ON HISTOARCHITECTURE OF THE CEREBRAL BLOOD VESSELS IN ADULT WISTAR RATS

Abstract

Cerebral blood vessels are vital in supplying brain in both human and animals. Any anomaly by rupture or interruption of blood flow may lead to fatal consequences. Dichlorvos is a volatile organophosphate that forms the active ingredient of locally formulated insecticide and pesticide known as Otapiapia or Madararpiapia. It is an anti-acetylcholinestrase that binds irreversibly to acetylcholinesterase and leads to its inhibition. The study aims to determine the effects of dichlorvos on the histology of the cerebral vessels in adult wistar rats. Twenty five apparently healthy adult wistar rats were randomly selected and divided into five groups. The first two groups were used as control while the last three groups were exposed to graded doses of dichlorvos in ethanol solution and experimented for twenty eight days. Twenty four hours after the last exposure the animals were sacrificed and the brain tissues were collected for routine histological technique. The relative brain weights of all the animals were determined and one – way ANOVA was conducted to compare the mean of the control with the treated groups. There was no statistically significant difference [F = 0.88, p = 0.49] in the mean brain weights of the controls and the treated groups. The H&E stain of the treated groups showed variable degrees of perivascular oedema, pyknosis and apoptosis. Prolong use of dichlorvos could cause cerebral vascular changes in the histoarchitecture such as perivascular oedema and apoptosis, may not affect the brain weight