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. During the course of apoptosis, several changes occur at cellular and molecular level, among which the superstructural modifications of DNA cleavage and chromatin were studied by DNA laddering assays, transmission electron microscope (TEM) and flow cytometric methods. The present study is focused on the programmed cell death of human skin fibroblast induced by benzimidazole, a widely used fungicide in the tanning industry. MATERIALS AND METHODS. Human skin fibroblasts were maintained at 37 0 C in a humidified incubator in DMEM supplemented with 1% penicillin-streptomycin and 10% fetal bovine serum. Cells were passaged at confluence by trypsinization, with all experiments performed on cells at low passage (≤4). Programmed cell death induced by different concentrations of benzimidazole on cultured skin fibroblast were analyzed by DNA laddering techniques (1), flow cytometry, and TEM analysis was carried out by standard procedures given by Goping et al. (2) and Willingham (3,4). Viability of cells cultured in the 96-well plates was assessed by mitochondrial dehydrogenase activity using the calorimetric MTT assay (4). RESULTS. The ultrastructural studies reveal that benzimidazole causes pyknosis and kryorrhexis (fragmentation) in the nucleus of skin fibroblast. Application of benzimidazole at 10 µg/ml DMEM medium induced shrinkage in fibroblasts and after 3 hours apoptotic body formation was identified. Microscopic analysis showed nuclear disintegration and chromatin granulation. More evidently the DNA laddering and flow cytometry confirm that higher concentration of benzimidazole induced quantitative variations and breaks in DNA and induce cytotoxicity in fibroblast population. At lower concentration of benzimidazole, vesiculation of endoplasmic reticulum is induced and these vesicles after fusion with plasma membrane gave a characteristic blebbed appearance as revealed by light and electron microscopic studies. DISCUSSION. A common hallmark of apoptosis is DNA fragmentation, which was analyzed by DNA laddering techniques. Morphological characteristics and chromatin cleavage in skin fibroblasts was established by cytochemical and electrophoretic methods and the results showed that benzimidazole has the potential to cleave the DNA and act as a potent toxicant. Thus, fibroblast is not killed by benzimidazole, but is induced to commit suicide or apoptosis at lower concentration. At higher concentration of benzimidazole, the fibroblasts lose the spindle shape and take up a round shape and get detached from the substratum. During this process nuclear and cellular fragmentation were observed. The ultrastructural alteration was

Programmed Cell Death of Human Skin Fibroblast Induced by Benzimidazole