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All rights reserved. http://resource.belframework.org/belframework/1.0/knowledge/large_corpus.bel http://purl.org/dc/elements/1.1/title BEL Framework Large Corpus Document http://resource.belframework.org/belframework/1.0/knowledge/large_corpus.bel http://purl.org/pav/authoredBy http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#_4 http://resource.belframework.org/belframework/1.0/knowledge/large_corpus.bel http://purl.org/pav/version 1.4 http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#_3 http://www.w3.org/ns/prov#value Treatment of intact C3H10T1/2 cells or microsomes therefrom with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and benzanthracene (BA) enhanced CYP1B1 activity and CYP1B1 expression as revealed by elevations of CYP1B1-catalyzed DMBA metabolism, CYP1B1 apoprotein level and CYP1B1 gene expression. One hundred microM DHEA caused an 80-90% inhibition of cellular DMBA metabolism without inflicting cell death. Cytosolic glucose-6-phosphate dehydrogenase (G6PDH) was also inhibited in DHEA-treated cells, presumably due to the inhibition of NADP reduction. In contrast, neither DMBA metabolism nor CYP1B1 apoprotein was inhibited by DHEA in the microsomes isolated from these cells. DHEA (100 microM), TCDD (10 nM) and BA (10 microM) stimulated the activities and increased the apoprotein levels of two peroxisomal enzymes, namely, acyl CoA oxidase (ACOX) and acyl CoA hydrolase (ACH2) and also induced the expression of CYP1B1 and ACOX genes. Cytosolic fatty acyl-CoA beta-oxidation was also stimulated by DHEA, TCDD and BA. In corroboratory experiments, it was found that concomitant with the stimulation of the activity of a key enzyme regulator of fatty acid homeostasis, namely, glycerol-3-phosphate dehydrogenase (G3PDH), these agents enhanced arachidonic acid (AA) metabolism as judged by the release of [3H] from AA into the culture medium. Collectively, these data suggest that DHEA mediates the regulation of CYP1B1 and inhibits BA and TCDD-induced CYP1B1-catalyzed carcinogen (DMBA) activation in 10T1/2 cells through metabolic interactions that involve the activation of the peroxisomal and fatty acid beta-oxidation signaling pathways. These results also present evidence for the first time, for the possible peroxisomal effects of TCDD and BA which are similar to those of DHEA in this mouse embryo fibroblast cell line. http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#_3 http://www.w3.org/ns/prov#wasQuotedFrom http://www.ncbi.nlm.nih.gov/pubmed/10497882 http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#_4 http://www.w3.org/2000/01/rdf-schema#label Selventa http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#assertion http://www.w3.org/ns/prov#hadPrimarySource http://www.ncbi.nlm.nih.gov/pubmed/10497882 http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#assertion http://www.w3.org/ns/prov#wasDerivedFrom http://resource.belframework.org/belframework/1.0/knowledge/large_corpus.bel http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#assertion http://www.w3.org/ns/prov#wasDerivedFrom http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#_3 http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0#pubinfo http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0 http://purl.org/dc/terms/created 2014-07-03T14:29:48.547+02:00 http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0 http://purl.org/pav/createdBy http://orcid.org/0000-0001-6818-334X http://www.tkuhn.ch/bel2nanopub/RAxdm-BAdpja47GerUsDPi-r_eD2fGbWZlEzNd-s9Wkm0 http://purl.org/pav/createdBy http://orcid.org/0000-0002-1267-0234