Colon Cancer Prevention: Dietary Modulation of Cellular and by Peter G. Traber (auth.)
By Peter G. Traber (auth.)
The 8th Annual examine convention of the yankee Institute for melanoma examine, held in Washington, D.C., September 3-4, 1998, used to be at the topic "Colon melanoma Prevention: nutritional Modulation of mobile and Molecular Mechanisms," with contributors representing a number of disciplines drawn to this sector. one of many communicate ers supplied a suitable quote from seventeenth century health care professional Thomas Adams: "Pre vention is best than therapeutic since it saves the exertions of being sick," which aptly describes the necessity for the prevention of melanoma. an outline of standard and irregular colonic improvement emphasised that even though the common human colon undergoes 1013 mobilephone divisions via age 60, with the asso ciated chances for errors, quite few colon tumors improve. due to the fact nutritional modu lation ends up in super small alterations in colonic cells over a protracted interval, animal versions are worthy to time, notice, and delineate the occasions linked to colon melanoma. within the improvement colon melanoma, the inactivation of the adenomatous polyposis coli (Apc) gene is without doubt one of the earliest recognized occasions. typically Apc downregulates the mobile protein beta-catenin, yet this can be misplaced in the course of melanoma improvement. Beta-catenin may well itself be an oncogene; it has a brief half-life, however it is stabilized by means of binding to is extra customary within the telephone nucleus, the gene shuttles caherin. even if the Apc among the nucleus and the cytoplasm.
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Extra info for Colon Cancer Prevention: Dietary Modulation of Cellular and Molecular Mechanisms
Cancer Res. 58:2524-2527, 1998. 17. , Nakamura. Y, and Miyoshi, Y Activation of the beta-catenin gene by interstitial deletions involving exon 3 in primary colorectal carcinomas without adenomatous polyposis coli mutations. Cancer r~es. 58:1021-1026,1998. 18. , Romagnolo. , Fabre, M .. , and Perret, C Somatic mutations of the beta-catenin gene are frequent in mouse and human hepatocellular carcinomas. Proc. Natl. Acad. Sci. USA 95:8847-8851,1998. 19. Fukuchi. T.. Sakamoto, M.. Tsuda, H .. Maruyama.
Oncogene 3:423, 1988. 35. C Sensitivity of nuclear c-rnyc levels and induction to differentiation-inducing agents in human colon tumor cell lines. Cancer Lett. 62:95, 1992. 36. A. and Warwick, G. Butyrate rapidly induces growth inhibition and differentiation in HT29 cells. Cell Growth Differ. 4:495, 1993. 37. , and Sakai, T. Butyrate activates the wafl/cipl gene promoter through Spl sites in a p53-negative human colon cancer cell line. f. BioI. Chern. 272:22199, 1997. 38. O. Induction of caspase3 protease activity and apoptosis by butyrate and trichostatin A (inhibitors of histone de acetylase ): dependence on protein synthesis and synergy with a mitochondrial/cytochrome c-dependent pathway.
Data taken from reference 29. colon mucosa has been shown to be resistant to peroxidation. 31 Therefore, it is possible that differences in oxidative stress imposed by iron resulted in variations of MnSOD in these two models. Differences in MnSOD regulation may also occur as the result of limited manganese availability and post-translational MnSOD changes in the in vivo model. Future studies of the effect of iron on colonic MnSOD using both systems should address whether changes in activity occur as the result of increased mRNA levels or as the result of post-translational alterations due to protein stability or limited manganese availability.