title: Preliminary evaluation of influence of gemcitabine (Gemzar) on proliferation and neuroendocrine activity of human TT cell line: immunocytochemical investigations.
abstract: The choice treatment of medullary thyroid carcinoma (MTC) is total thyroidectomy. It is difficult to evaluate effectiveness of chemotherapy due to the rare incidence of MTC. Gemcitabine is a new drug of antimetabolite nucleoside group used in treatment of cancers since 1996. The aim of this study was to evaluate the influence of gemcitabine on proliferation and neuroendocrine activity of human TT cell line derived from MTC. The cells were exposed to gemcitabine in the concentration of 10, 25 and 50 microg/ml for 24 hours. Immunocytochemical examinations were carried out by the method of avidin-biotin peroxidase complex (ABC) according to Hsu et al. to detect calcitonin, chromogranin A, synaptophysin and neuron-specific enolase in TT cells. A concentration-dependent inhibitory influence of gemcitabine on proliferative activity of TT cells was observed. It was also shown that the immunostaining was reduced, especially in case of neuron-specific enolase. Only the reaction detecting calcitonin was enhanced in persistin
authors.affiliation: 1st Department of General Surgery, Medical Academy, Białystok, Poland. klchirog@amb.ac.bialystok.pl
authors.forename: J
authors.initials: J
authors.lastname: Dadan
authors.forename: S
authors.initials: S
authors.lastname: Wołczyński
authors.forename: B
authors.initials: B
authors.lastname: Sawicki
authors.forename: L
authors.initials: L
authors.lastname: Chyczewski
authors.forename: A
authors.initials: A
authors.lastname: Azzadin
authors.forename: J
authors.initials: J
authors.lastname: Dziecioł
authors.forename: Z
authors.initials: Z
authors.lastname: Puchalski
mesh_terms: D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology*; D018276:Carcinoma, Medullary / Q000473:pathology*; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003841:Deoxycytidine / Q000031:analogs & derivatives / Q000494:pharmacology*; D006801:Humans; D007150:Immunohistochemistry; D009490:Neurosecretory Systems / Q000187:drug effects*; D013964:Thyroid Neoplasms / Q000473:pathology*; D014407:Tumor Cells, Cultured; D000093542:Gemcitabine
chemical_list: D000964:Antimetabolites, Antineoplastic; D003841:Deoxycytidine; D000093542:Gemcitabine