title: [Effects of pingyangmycin on the growth and differentiation of the transplantable squamous cell carcinoma of forestomach (GS-742) in mice].
abstract: The effect of pinyangmycin (PYM) on the growth and differentiation of the transplantable squamous cell carcinoma of forestomach (GS-742) in mice was studied by optical and electron microscope. The results showed that PYM had marked growth inhibitory effect on GS-742. Histopathologically, tumor necrosis, fibrosis and infiltration of lymphocytes were obvious in mice treated with PYM. A decrease in mitosis and increase in keratinization were also conspicuous. Ultrastructurally, microvilli on tumor cells were significantly reduced in number with formation of blebs and ruffles; mitochondria were swollen; endoplasmic reticulum was often decreased and dilated; and desmosome and tonofibrils were increased. The results indicate that PYM exerts its growth-inhibitory effect on tumor cells by cell damage, inhibition of mitosis and promotion of differentiation.
authors: Hebei Medical College, Shijiazhuang.
authors: F R
authors: FR
authors: Wang
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000627:therapeutic use*; D001761:Bleomycin / Q000627:therapeutic use* / Q000031:analogs & derivatives; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy* / Q000473:pathology / Q000648:ultrastructure; D002454:Cell Differentiation / Q000187:drug effects; D005260:Female; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000648:ultrastructure
chemical_list: D000903:Antibiotics, Antineoplastic; D001761:Bleomycin; C021771:zhengguangmycin