Histological alterations in liver and testis of Astyanax aff. bimaculatus caused by acute exposition to zinc

Revista Ceres

Daiane Cristina Marques Dos Santos*¹  Marli Do Carmo Cupertino¹  Sérgio Luis Pinto Da Matta¹  Juraci Alves De Oliveira¹  Jorge Abdala Dergam Dos Santos¹ 

[1] ,Universidade Federal de ViçosaViçosa Minas Gerais ,Brazil

关键词: aquatic contamination;    gonad;    heavy metal;    histopathology;    liver;    yellow tail lambari;    metal pesado;    contaminação aquática;    lambari do rabo amarelo;    gônadas;    fígado;    histopatologia;   

DOI  :  10.1590/0034-737X201562020002

来源: SciELO

【 摘 要 】

This study investigated the effect of acute exposition to zinc (Zn) on histology of the liver and testes of yellow tail lambari (Astyanax aff. bimaculatus). The exposure consisted of six concentrations of Zn (0, 3, 5, 10, 15, and 20 mg/L) for 96 hours of exposure. Fragments of liver and testis were routinely processed and embedded in plastic resin based on glycol methacrylate. Fragments of bones, muscles, liver and testis were dehydrated and digested to quantify the absorption levels of Zn in the tissue. Acute exposure to concentrations above 10mg/L has produced structural changes in the liver and gonads. The changes found in the liver were vascular congestion; decrease of cellular volume; displacement of the hepatocyte nucleus; necrosis; disarrangement of cordon structure; leukocyte infiltrate and vacuolization. The changes found in the gonads were ruptured cyst, delayed development of germ cells, pyknotic nucleus, cell cluster, displacement of cyst wall and vacuolization. The histological changes observed were compatible with the increasing concentration of zinc in environment, compromising liver and reproductive functions, because there was an increase in relative frequency of hepatocytes and reduced sperm production

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