Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA292323 | ENA |
REPOSITORIES: ENA
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Project description:The effect of Tlr4P712H mutation (rendering TLR4 non-functional), or gut-sterilization by antibiotics, on the induction of tumorgenesis by CCl4 and diethylnitrosamine (DEN) was characterized. Affymetrix Mouse 430 2.0 gene expression measurements were used to characterize the transcriptomic basis of the effects of the above treatments and genotypes on tumorgenesis. Gene expression of mouse livers of A. WT C3H/HeOuJ mice, B. WT C3H/HeOuJ mice treated with CCl4 and DEN, C. TLR4-mutant C3H/HeJ mice (Tlr4P712H) treated with CCl4 and DEN and D. WT C3H/HeOuJ mice treated with antibiotics (a combination of ampicillin (1 g/l), neomycin [1 g/l], metronidazole[1 g/l] and vancomycin [500 mg/l] in drinking water) and CCl4 and DEN were characterized.
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Project description:Gene-expression profiles of liver tissue of cabon tetrachloride (CCl4)-treated mouse and the effect of erlotinib Hepatocellular carcinoma (HCC) is the sixth most common solid tumor worldwide and the third leading cause of cancer-related death. Given the lack of successful treatment options, chemoprevention in high-risk patients has been proposed as an alternative strategy. Mounting evidence supports a role for epidermal growth factor (EGF) during chronic liver disease and hepatocellular transformation. We address the hypothesis that blocking the EGF-EGF receptor (EGFR) pathway may be an effective strategy for inhibiting fibrogenesis and hepatocarcinogenesis. A rat model of diethylnitrosamine (DEN)-induced cirrhosis was used to examine the effects of erlotinib on underlying chronic liver disease and HCC formation. The DEN-induced rat model closely resembles disease progression in humans both pathologically and molecularly. Erlotinib significantly prevented the development of HCC tumor nodules in a dose-dependent fashion. Further, erlotinib inhibited the activation of hepatic stellate cells and prevented fibrogenesis. Erlotinib also reduced hepatotoxicity and improved liver function. Finally, a gene expression signature predictive of poor survival in human cirrhosis patients was reversed in response to erlotinib. Our data demonstrate for the first time that EGFR inhibition prevents liver fibrogenesis. Further, our results suggest that erlotinib is a potentially effective HCC chemoprevention strategy through inhibition of cirrhosis progression which can be monitored at the molecular level. Animals received humane care according to the criteria outlined in the M-bM-^@M-^\Guide for the Care and Use of Laboratory AnimalsM-bM-^@M-^] of the National Academy of Sciences. All animals were maintained in accordance with the institutional guidelines of the Massachusetts General Hospital Subcommittee on Research Animal Care. Strain A/J male mice (Jackson Laboratory, Bar Harbor, ME) were treated three times a week for 18 weeks with either 0.1cc of a 40 percent solution of CCl4 (Sigma) in olive oil or with vehicle control by oral gavage. Mice were sacrificed at 19 weeks after a one-week washout to eliminate acute effects of CCl4. The liver was sectioned and fixed in phosphate-buffered 10% formaldehyde for histological analysis. The remaining portions of the liver were collected in RNase-free tubes and snap-frozen in liquid nitrogen. Frozen tissues were stored at -80M-BM-0C until use.
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