Isolation and characterization of cortisol-sensitive and -resistant P1798 mouse lymphosarcoma cell lines.
Three cell lines have been isolated and characterized from the P1798 mouse lymphosarcoma. One line, derived from a glucocorticoid-resistant tumor, was glucocorticoid-resistant in vitro. The other two cell lines, derived from glucocorticoid-sensitive and -resistant parental tumors, respectively, were shown to be glucocorticoid-sensitive in vitro. The glucocorticoid receptor from all three cell lines bound glucocorticoid with similar affinity and capacity. However, based on Sephacryl S-300 gel filtration, the glucocorticoid receptor from the resistant cell line was smaller than that of the two sensitive cell lines. Moreover, the glucocorticoid receptor from the resistant cell line accumulated to a greater extent in the nucleus. This resistant cell line thus resembles the nti variant of the S49 lymphoma cell line. All three cell lines were tumorigenic and metastatic when reimplanted into mice, contained the normal mouse diploid complement of 40 chromosomes and exhibited the same responsiveness to cortisol in vivo as they did in vitro. It is concluded that the ready passage of these cell lines in vitro or in vivo and the presence of the small receptor in the resistant line should make them excellent model systems for the study of glucocorticoid resistance.
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Grace Cancer Drug Center, Roswell Park Memorial Institute, New York State Department of Health, Buffalo 14263.
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D000818:Animals; D002455:Cell Division; D002850:Chromatography, Gel; D002875:Chromosomes; D004351:Drug Resistance; D005260:Female; D006854:Hydrocortisone / Q000494:pharmacology*; D008228:Lymphoma, Non-Hodgkin / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology / Q000556:secondary; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D011965:Receptors, Glucocorticoid / Q000032:analysis; D014407:Tumor Cells, Cultured
D011965:Receptors, Glucocorticoid; D006854:Hydrocortisone