EFFECT OF DIETHYLNITROSAMINE ON THE LIVER OF RAT——THE ULTRASTRUCTURES OF HEPATOMA CELL / 解剖学报

ABSTRACT

Liver carcinogenesis induced by diethylnitrosamine (DEN) was studied in 19 male albino rats under electron microscope. The effects of DEN on hepatocytes included following basic abnomalities1. The characteristic features of the nucleus are irregulat in shape, increase of interchromatin granules, and decrease of nucleolus-associated chromatin. The nucleoli are enlarged, irregular in shape and showing remarkable deformity of nucleolonema.2. The characteristic features of the cytoplasm are as follows. The mitochondria increase or decrease in number and size, they are irregular in shape with some variation in cristal pattern. Endoplasmic reticulum (ER) increases in the width of the lumina, detachment of some ribosomes from the membraneous component of rough endoplasmic reticulum (RER) and the appearance of concentric bodies of ER (RER concentric body or SER concentric body).3. The characteristic features of the cell membrane are the increase in the number of microvilli facing the Disses' space, the enlargement of bile canaliculi with increase or decrease in number of microvilli. Plasmalemma connecting between the adjacent hepatoma cells may be straight, wavelike or interdigitated.