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We investigated the relationship between DNA degradation and lysosome activity (loss of lysosomal integrity) in necrotic cell death induced by carbon tetrachloride (CCl 4 ) and dimethylnitrosamine (DMN): coagulation necrosis and hemorrhagic necrosis, respectively. TdT-mediated dUTP–biotin nick end-labeling (TUNEL) and enzyme histochemistry for acid phosphatase were performed in both models and results were analyzed by light microscopy, electron microscopy, and confocal laser scanning microscopy (CLSM). In the CCl 4 -injected liver, TUNEL staining was closely associated with release of lysosomal enzymes into the cytoplasm, and intranuclear deposition of lysosomal enzymes took place at an early stage of subcellular damage. In the DMN-injected liver, TUNEL-positive nuclei tended to have well-preserved lysosomes and centrally localized TUNEL signals. It was assumed that acute hepatocellular damage in the CCl 4 -injected liver would be characterized by necrotic cell death with lysosome activation and that damage in the DMN-injected liver would be necrotic cell death without lysosome activation. In the DMN-injected liver, DNA degradation may be selectively induced in the nuclear center, in which heterochromatin (including inactive chromatin) is believed to be a target. We concluded that necrotic cell death, i.e., DNA degradation, would be at least divided into two types, with/without association with lysosome activation, represented by necrotic cell death in the CCl 4 -injected liver and that in the DMN-injected liver.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Differentiation of Necrotic Cell Death With or Without Lysosomal Activation: Application of Acute Liver Injury Models Induced by Carbon Tetrachloride (CCL<sub>4</sub>) and Dimethylnitrosamine (DMN)

Differentiation of Necrotic Cell Death With or Without Lysosomal Activation: Application of Acute Liver Injury Models Induced by Carbon Tetrachloride (CCL4) and Dimethylnitrosamine (DMN)

Differentiation of Necrotic Cell Death With or Without Lysosomal Activation: Application of Acute Liver Injury Models Induced by Carbon Tetrachloride (CCL₄) and Dimethylnitrosamine (DMN)