@article{christensen_romach_healy_gonzales_anderson_malarkey_corton_fox_cattley_goldsworthy_1999, title={Altered bcl-2 family expression during non-genotoxic hepatocarcinogenesis in mice}, volume={20}, ISSN={["1460-2180"]}, DOI={10.1093/carcin/20.8.1583}, abstractNote={Dysregulation of apoptosis is an important component of multistage hepatocarcinogenesis. Members of the bcl-2 protein family are important in the regulation of apoptosis and their expression is altered in several cancers. The objectives of the present study were to determine whether the expression of members of the bcl-2 protein family are altered in mouse liver during acute treatment with non-genotoxic carcinogens and throughout non-genotoxic hepatocarcinogenesis. Acute treatment of B6C3F1 mice with phenobarbital resulted in increased levels of bcl-2 and decreased levels of bax protein, while acute treatment with WY-14,643 resulted in increased bcl-2 and BAG-1 protein in the liver. Following chronic treatment, altered hepatic foci and adenomas were classified as: small-cell, heterogeneous basophilic lesions (spontaneous or tetrachlorodibenzo-p-dioxin-induced); large-cell, homogeneous basophilic lesions (WY-14,643-induced); acidophilic lesions (phenobarbital- or chlordane-induced). Of the small-cell heterogeneous basophilic lesions, 86% of foci (31/36) and 85% of adenomas (35/41) exhibited increased bcl-2 protein levels compared with surrounding normal hepatocytes, whereas only 12.5% of foci (4/36) and 12% of adenomas (5/41) exhibited increased bcl-X(L) levels. Of the large-cell, homogenous, basophilic lesions, 100% of foci (3/3) and 90% of adenomas (9/10) expressed bcl-2 protein, whereas 100% of foci (3/3) and 80% of adenomas (8/10) exhibited increased bcl-X(L) protein levels compared with surrounding normal hepatocytes. Of the acidophilic lesions, the majority of foci (28/32, 88%) and adenomas (47/50, 94%) expressed increased bcl-X(L), whereas increased bcl-2 was observed in only 12.5% of acidophilic preneoplastic foci (4/32) and 14% of acidophilic adenomas (7/50). Of the carcinomas analyzed, 81% expressed increased bcl-2 (54/67), 78% expressed increased bcl-X(L) (52/67) and 69% expressed increased levels of both bcl-2 and bcl-X(L) (46/67). Collectively, only 8% of preneoplastic foci, 3% of adenomas and 1.5% of carcinomas did not express either bcl-2 or bcl-X(L). These results suggest that regulation of apoptotic proteins is altered during non-genotoxic carcinogenesis in mouse liver. Furthermore, there were both chemical- and lesion-specific aspects of expression of apoptotic proteins during hepatocarcinogenesis in mice.}, number={8}, journal={CARCINOGENESIS}, author={Christensen, JG and Romach, EH and Healy, LN and Gonzales, AJ and Anderson, SP and Malarkey, DE and Corton, JC and Fox, TR and Cattley, RC and Goldsworthy, TL}, year={1999}, month={Aug}, pages={1583–1590} }
 @article{betton_healy_english_bunch_1999, title={Atypical limbal melanoma in a cat}, volume={13}, ISSN={["0891-6640"]}, DOI={10.1892/0891-6640(1999)013<0379:ALMIAC>2.3.CO;2}, number={4}, journal={JOURNAL OF VETERINARY INTERNAL MEDICINE}, author={Betton, A and Healy, LN and English, RV and Bunch, SE}, year={1999}, pages={379–381} }
 @article{healy_pluta_recio_1999, title={Expression and distribution of cytochrome P450 2E1 in B6C3F1 mouse liver and testes}, volume={121}, ISSN={["1872-7786"]}, DOI={10.1016/S0009-2797(99)00082-4}, abstractNote={Cytochrome P450 2E1 (CYP2E1) is believed to have a significant role in the bioactivation of 1,3-butadiene (BD) to DNA reactive epoxide metabolites that induce somatic and germ cell genotoxicity in mice. To assess the potential role of in situ bioactivation of BD by mouse testes for inducing germ cell genotoxicity, the presence of CYP2E1 in testes has been demonstrated by reverse transcriptase-polymerase chain reaction (RT-PCR), immunoprecipitation-Western blotting methods (IP-Western) and immunohistochemistry of tissue sections. Detection of CYP2E1 in the testes was limited to interstitial cells. In liver a known site of BD bioactivation and a positive control tissue used for these studies, a discrete, zonal staining pattern of liver CYP2E1 expression detected by immunohistochemical staining was shown. These results suggest that in situ bioactivation of BD in testes by CYP2E1 may contribute to BD-induced germ cell genotoxicity.}, number={2}, journal={CHEMICO-BIOLOGICAL INTERACTIONS}, author={Healy, LN and Pluta, LJ and Recio, L}, year={1999}, month={Jul}, pages={199–207} }