We measured the relative binding of the labeled carcinogen 9,10-dimethyl-l,2-benzanthracene-3H (DMBA-3H) to mouse satellite and main-band epidermal DNA 24 hr after the topical application of the carcinogen to mouse skin. Labeled DMBA-bound DNA was fractionated into satellite and main-band components by composite gel electrophoresis and by isopycnic CsCl centrifugation. With both fractionation m...

The present study was designed to elucidate differences in the mechanism of the induction of mouse skin tumors either by the initiation-promotion regimen or by the complete carcinogenesis process. The protocols used to elicit skin tumors were: (a) by the initiation-promotion regimen, a single application of 0.2 ,umol of 7,12-dimethylbenz[a]anthracene (DMBA) followed by twice-weekly applications...

Aim of the present study was to evaluate the anti-tumor effect of orally administered rosmarinic acid in 7,12-dimethylbenz(a)anthracene (DMBA) induced skin carcinogenesis in Swiss albino mice. Phase I and II detoxication agents, lipid peroxidation byproducts, antioxidants and apoptotic biomarkers were used to assess chemopreventive efficacy of rosmarinic acid in DMBA induced skin carcinogenesis...

Glutathione S-transferases (GSTs) are the products of a multigene family. A well-established function of GSTs is to metabolize carcinogens by catalysing the conjugation of electrophilic substrates to glutathione. Whether placental GST (GST-P) is expressed during the promotion of two-stage hamster buccal-pouch mucosa (HBPM) carcinogenesis was investigated here, using 7,12-dimethylbenz[a]anthrace...

INTRODUCTION Oral carcinoma accounts for 40-50 percent of all cancers in India. Tobacco chewing, smoking and alcohol consumption are the major risk factors associated with the high incidence of oral cancer in India. Our aim was to investigate the chemopreventive potential of curcumin and piperine during 7,12-dimethylbenz[a]anthracene (DMBA)-induced hamster buccal pouch carcinogenesis. METHODS...

We have reported recently that resveratrol (trans-3,4',5-trihydroxystilbene), a polyphenolic phytoalexin found in grapes, fruits, and root extracts of the weed Polygonum cuspidatum, is a potent inhibitor of nuclear factor (NF)-kappaB activation. Because NF-kappaB suppression has been linked with chemoprevention, this prompted us to investigate the chemopreventive potential of resveratrol by tes...

Sprague-Dawley female rats were sacrificed at various times after the intragastric administration of 7 , 12-dimethylbenz(a)anthracene (DMBA>3H. The abdominal-inguinal mammary glands were removed, and the parenchymal cells were separated. Parenchymal cell DNA and protein were isolated, and the DNA was purified by density equilibrium centrifugation in cesium chloride. Sixteen hr after carcinogen ...

Fifty outbred Syrian golden hamsters were equally divided into three experimental groups and two control groups. The pouches of the experimental groups were painted bilaterally with a 0.5% 7,12-dimethylbenz[a]anthracene (DMBA) solution thrice a week for 3, 7 and 14 weeks. One of the control groups was applied with mineral oil while another control group remained untreated throughout the experim...

PURPOSE Synthetic progestins are widely used therapeutically; however, there is controversy regarding their proliferative effects. We used a rat 7,12-dimethylbenz[a]anthracene (DMBA)-induced mammary tumor model to test the hypothesis that progestins increase angiogenesis and as a result decrease the latency period and increase the multiplicity of mammary tumors. EXPERIMENTAL DESIGN Medroxypro...

We measured the relative binding of the labeled carcinogen 9,10-dimethyl-l,2-benzanthracene-3H (DMBA-3H) to mouse satellite and main-band epidermal DNA 24 hr after the topical application of the carcinogen to mouse skin. Labeled DMBA-bound DNA was fractionated into satellite and main-band components by composite gel electrophoresis and by isopycnic CsCl centrifugation. With both fractionation m...