Lead is one of the most well-known naturally occurring environmental heavy metals. This experimental
study was designed to evaluate lead induced toxic effects on hepatocytes and lobular
architecture as judged microscopically. Material and Methods: This study was conducted in
anatomy department, Benha faculty of medicine, Benha University, Egypt from May to October
2013 on 30 normal adult albino rats divided into 3 groups; one control and 2 experimental groups.
The experimental groups were given 0.13% lead acetate solution in drinking water for 4 and 8
weeks, respectively. Animals were scarified and livers were removed and used to identify microscopic
changes. Specimens were stained with Hematoxylin and eosin, with Masson trichrome stain
for study of fibrous tissue and with periodic acid shiff's (PAS) to study the glycogen content .Other
specimens were prepared for ultrastructural study. Results: Mild lymphocytic infiltration, vacuolar
degeneration and mild increase of periportal fibrosis with mild depletion of glycogen content
and partial disappearance of glycogen vacuoles were reported in animals received contaminated
water for 4 weeks. Animals maintained for 8 weeks on contaminated water showed
hepatic changes in the form of abundant lymphocytic infiltration, increased cellular polymorphism,
pyknotic nuclei and areas of cell necrosis with evident moderate periportal fibrosis and
marked vacuolar degeneration associated with marked depletion of glycogen content. Ultrastructural
study revealed mitochondrial edema, appearance of interstitial inflammatory cells, and appearance
of scattered variable sized lead electron-dense inclusion bodies. Conclusion: It could be
concluded that chronic exposure to lead imposes a potent toxic effect on liver cells manifested as
glycogen depletion, cellular infiltration and liver architecture in the form of initiation of periportal
fibrosis that may progress to liver cirrhosis. |
