title: Loss of heterozygosity analysis of mouse pulmonary adenomas induced by coal tar.
abstract: Manufactured gas plant (MGP) residues, commonly known as coal tars, were generated several decades ago as a byproduct of residential and industrial gas production from the distillation of coal. Previous short-term exposure studies have shown MGP residues to be tumorigenic in mouse liver and lung. In order to gain further insight into carcinogenesis by complex mixtures of environmental chemicals containing known carcinogenic polycyclic aromatic hydrocarbons, we investigated mouse pulmonary tumors for loss of heterozygosity (LOH) as a result of multiple exposure to MGP residues. Twenty mouse lung adenomas produced in (C57BL/6 x C3H)F1 hybrid mice and manually microdissected were selected to examine genome-wide allelic losses at 58 microsatellite loci. Regions of chromosomes 1, 4, 5, 8, and 11 were affected in 30-40% of tumors. The elevated rates of allelic imbalance in these chromosomes may indicate the location of unknown tumor suppressor genes significant to neoplastic transformation in mouse lung tissues. Laser capture microdissection-based LOH analysis of pulmonary adenomas showed that contamination of nonneoplastic tissues was not masking the allelic losses in the manually microdissected tumor analysis. The low frequency of chromosome instability in these tumors, measured by means of inter-simple sequence repeat PCR, suggests the presence of discrete regions of LOH instead of extensive structural rearrangements.
authors.affiliation: Department of Carcinogenesis, The University of Texas M.D. Anderson Cancer Center, Smithville, Texas 78957, USA. fbenavides@sprdl.mdacc.tmc.edu
authors.forename: Fernando
authors.initials: F
authors.lastname: Benavides
authors.forename: Claudio J
authors.initials: CJ
authors.lastname: Conti
authors.forename: Margaret
authors.initials: M
authors.lastname: LaCava
authors.forename: Mónica
authors.initials: M
authors.lastname: Flores
authors.forename: Edward
authors.initials: E
authors.lastname: Glasscock
authors.forename: Gabriel
authors.initials: G
authors.lastname: Sternik
authors.forename: Irma B
authors.initials: IB
authors.lastname: Gimenez-Conti
authors.forename: Dennis A
authors.initials: DA
authors.lastname: Johnston
authors.forename: Harold A
authors.initials: HA
authors.lastname: Dunsford
authors.forename: Lawrence S
authors.initials: LS
authors.lastname: Goldstein
authors.forename: Lewis V
authors.initials: LV
authors.lastname: Rodriguez
mesh_terms: D000236:Adenoma / Q000139:chemically induced / Q000235:genetics*; D000818:Animals; D003033:Coal Tar / Q000633:toxicity*; D005260:Female; D005838:Genotype; D019656:Loss of Heterozygosity; D008175:Lung Neoplasms / Q000139:chemically induced / Q000235:genetics*; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D016133:Polymerase Chain Reaction
chemical_list: D003033:Coal Tar