PMID- 2456634 OWN - NLM STAT- MEDLINE DCOM- 19880901 LR - 20221007 IS - 0300-8916 (Print) IS - 0300-8916 (Linking) VI - 74 IP - 3 DP - 1988 Jun 30 TI - Morphologic and antigenic properties of mouse mammary tumor virus produced in a hormone-responsive fashion by C57Bl/10 mammary tumors of non-viral origin. PG - 261-7 AB - Bl-MaTU/A1 mouse mammary tumor cells, derived from a C57B1/10 mammary adenocarcinoma induced by dimethylbenzanthracene and mammotropic hormones, express virus particles and proteins related to mouse mammary tumor virus (MMTV). Immunocytochemical analysis by means of monospecific and monoclonal anti-gp52 sera revealed a different localization of the main structural proteins of MMTV in Bl-MaTU/A1 and GR cells (the latter used as a positive virus-producing control). Immunoelectron microscopy of B-type particles budding from the microvilli of dexamethasone-stimulated Bl-MaTU/A1 cells showed remarkably weak reactivity of the viral envelope with anti-gp52-protein A-gold complexes as compared with that of dexamethasone-stimulated GR cells. Since Bl-MaTU/A1-associated MMTV originates from the amplified unit II of endogenous MMTV, which is altered probably within the env gene, the observed antigenic difference in the Bl-MaTU/A1-associated MMTV may be due to altered synthesis of gp52 glycoprotein in these cells. FAU - Marchetti, A AU - Marchetti A AD - Institute of Pathologic Anatomy and Histology, University of Pisa, Italia. FAU - Svec, J AU - Svec J FAU - Hlavay, E AU - Hlavay E FAU - Veselovska, Z AU - Veselovska Z FAU - Castagna, M AU - Castagna M FAU - Squartini, F AU - Squartini F LA - eng PT - Journal Article PL - United States TA - Tumori JT - Tumori JID - 0111356 RN - 0 (Antigens, Viral, Tumor) RN - 0 (Epitopes) SB - IM MH - Adenocarcinoma/chemically induced/*microbiology MH - Animals MH - Antigens, Viral, Tumor/*immunology MH - Epitopes MH - Fluorescent Antibody Technique MH - In Vitro Techniques MH - Mammary Neoplasms, Experimental/chemically induced/*microbiology MH - Mammary Tumor Virus, Mouse/*immunology MH - Mice MH - Mice, Inbred C57BL MH - Tumor Cells, Cultured/immunology MH - Virion/immunology EDAT- 1988/06/30 00:00 MHDA- 1988/06/30 00:01 CRDT- 1988/06/30 00:00 PHST- 1988/06/30 00:00 [pubmed] PHST- 1988/06/30 00:01 [medline] PHST- 1988/06/30 00:00 [entrez] AID - 10.1177/030089168807400304 [doi] PST - ppublish SO - Tumori. 1988 Jun 30;74(3):261-7. doi: 10.1177/030089168807400304.