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Fine structural changes induced in rat hepatocytes by single doses of 3'-methyl-4-dimethylaminoazobenzene
Abstract:
Male Leeds rats were given single oral doses of 150 or 300 mg/kg body weight of 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB). They were sacrificed 24 or 48 h after treatment and their hepatic tissues examined by electron microscopy. The development was observed of an unusual cytoplasmic change, which consisted of large perinuclear areas of decreased hyaloplasmic density, devoid of glycogen or organized structures, which displaced the organelles to the cell periphery. This arose by the formation of large glycogen lakes, which coalesced and then lost their glycogen content, and this was accompanied by nuclear irregularity and shrinkage. Other changes, affecting the endoplasmic reticulum and the cell surface, appeared to be similar to those induced by chronic azo dye feeding. It was concluded that the acute lesion observed may limit any specific responses of the hepatocytes to the presence of 3'-MeDAB.
Insights
Single doses of 3'-methyl-4-dimethylaminoazobenzene (3'-MeDAB) caused unusual cytoplasmic changes in rat liver cells. These acute hepatic lesions may affect how hepatocytes respond to 3'-MeDAB.
Area of Science:
- Hepatotoxicity
- Cellular Biology
- Toxicology
Background:
- 3 -methyl-4-dimethylaminoazobenzene (3 -MeDAB) is an azo dye known to induce liver damage.
- Understanding the acute effects of 3 -MeDAB is crucial for assessing its toxicological profile.
Purpose of the Study:
- To investigate the early cellular and subcellular changes in rat liver tissue following acute exposure to 3 -MeDAB.
- To characterize the nature of the observed cytoplasmic alterations.
Main Methods:
- Male Leeds rats were administered single oral doses of 150 or 300 mg/kg body weight of 3 -MeDAB.
- Hepatic tissues were collected 24 and 48 hours post-administration.
- Electron microscopy was utilized to examine ultrastructural changes in hepatocytes.
Main Results:
- Acute 3 -MeDAB exposure induced significant cytoplasmic changes in hepatocytes.
- Observed alterations included large perinuclear areas of decreased density, glycogen lake formation, and organelle displacement.
- Nuclear irregularities and shrinkage, along with endoplasmic reticulum and cell surface changes, were also noted.
Conclusions:
- The acute hepatic lesion induced by 3 -MeDAB involves unique cytoplasmic alterations.
- These changes may potentially modulate or limit the specific cellular responses of hepatocytes to the toxic insult.
- The findings provide insights into the early mechanisms of azo dye-induced hepatotoxicity.