title: [Mechanism of resistance to tumor necrosis factor].
abstract: To find clues as to the possible mechanisms of resistance against the cytotoxic activity of tumor necrosis factor (TNF), we developed TNF-resistant and TNF-sensitive subclones of the human cervic carcinoma cell line ME 180 and the mammary carcinoma cell line BT-20. Resistant subclones were selected by gradually increasing the TNF concentration in the culture medium over 4 months or 20 passages. Resistance to TNF was conserved in the absence of TNF after nearly 3 years and less than 100 passages. There were no differences in the number and affinity of TNF receptors between the sensitive and resistant clones. Similarly, SDS-PAGE of cell lysates showed identical bands. Sensitivity to actinomycin D, mitomycin C, and interferon-gamma was the same. No TNF message could be demonstrated in either subclone. As tumors grown in nude mice derived from the sensitive and resistant clones responded equally well to an intratumoral injection of TNF, we conclude that different mechanisms are responsible for sensitivity and resistance to the cytotoxic effect of TNF in vitro and in vivo.
authors.affiliation: Medizinische Klinik, Universität zu Köln.
authors.forename: M
authors.initials: M
authors.lastname: Pfreundschuh
authors.forename: B
authors.initials: B
authors.lastname: Genth
authors.forename: H
authors.initials: H
authors.lastname: Kirchner
authors.forename: P
authors.initials: P
authors.lastname: Scheurich
authors.forename: A
authors.initials: A
authors.lastname: Lindemann
authors.forename: H T
authors.initials: HT
authors.lastname: Steinmetz
authors.forename: M
authors.initials: M
authors.lastname: Schaadt
authors.forename: V
authors.initials: V
authors.lastname: Diehl
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects*; D004351:Drug Resistance; D005260:Female; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D011956:Receptors, Cell Surface / Q000187:drug effects; D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D002583:Uterine Cervical Neoplasms / Q000473:pathology
chemical_list: D011956:Receptors, Cell Surface; D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha
vernacular_title: Untersuchungen zum Resistenzmechanismus gegen Tumor-Nekrose-Faktor.