Human colonic

Biotin can be synthesized by the human colon flora. The question to which extent this production contributes to covering the host-organism s requirements is, however, subject to discussion. In most foods of animal origin as well as in cereals, biotin prevails in the protein (= enzyme)-bound form as e-N-biotinyl-L-lysine (= biocytin). Brewer s yeast, liver, soya beans, and peanuts number among the biotin rich foods [1]. 

ISSA J p, OTTAVIANO Y L, CELANO P, HAMILTON S R, DAVIDSON N E and BAYLIN S B (1994) Methylation of the oestrogen receptor CpG island links ageing and neoplasia in human colon , Nat Genet, 1, 536-40. 

TULLiEZ J and terce f (2000) Sulforaphane, a naturally occurring isothiocyanate, induces cell cycle arrest and apoptosis in HT29 human colon cancer cells . Cancer Res, 60 1426-33. 

AVIVI-GREEN c, PLOAK-CHARCON s, MADAR z, SCHWARTZ B (2002) Different molecule events account for butyrate-induced apoptosis in tiw human colon cancer cell line. J. Nutr. 132 1812-18. 

GAMET L, DAViAUD D, DENis-POUXViEL 0, REMESY 0, MURAT J 0 (1992) Effects of shoit-chain fatty acids on growth and differentiation of the human colon-cancer cell line HT29. Int J Cancer. 52 286-9. 

GIBSON G R, ROBERFRoiD M B (1995) Dietary modulation of the human colonic microbiota introducing the concept of prebiotics. J Ante 125 1401-12. 

HAGUE A, MANNING A M, HANLON K A, HUSCHTSCHA L I, HART D, PARASKEVA C (1993) Sodium butyrate induces apoptosis in human colonic tumour cell lines in a p53-independent pathway impUcations for the possible role of dietary fibre in the prevention of large-bowel cancer. /ni J Cancer. 55 498-505. 

OITATE M, NAKAKI R, KOYABU N, TAKANAGA H, MATSUO H, OHTANI H, SAWADA Y (2001) TranSCellular transport of genistein, a soybean-derived isoflavone, across human colon carcinoma cell line (Caco-2). Biopharm Drug Dispos. 22 23-9. 

PALOZZA P, SERINI S, MAGGIANO N, ANGELINI M, BONINSEGNA A, DI NICUOLO F, RANELLETTI F O and CALVIELLO G (2002) Induction of cell cycle arrest and apoptosis in human colon adenocarcinoma cell lines by P-carotene through down-regulation of cyclin A and Bcl-2 family proteins , Carcinogenesis, 23, 11-18. 

Studies by Hudson et al, (2000) have demonstrated the presence of eight polyphenols in rice bran by using high-pressure liquid chromatography. They are protocatechuic acid, p-coumaric acid, ferulic acid, sinapic aci vanillic acid, caffeic acid, which is a methoxycirmamic acid derivative, and tricin. The effect of these polyphenols on cell viability and on the colony-forming ability of human-derived MDA MB 468 and HBL 100 breast cells, colon-derived SW 480 and human colonic epithelial cells was assessed. These authors concluded that rice bran polyphenols have putative cancer chemopreventive properties. 

NPYR NNN, NPIP D-NPZ Human Colon organ culture metabolism to CO2 and binding to DNA and protein 28... 

This interceptor theory does not seem to be the only protective mechanism in operation. Inhibition of cytochrome P450 enzymes related to the bioactivation of mutagens and toxic radical scavenger activities have been proposed to integrate the different modes of action. Other investigations have reported the involvement of chlorophyUin in inducing apoptosis in human colon cells, which may be important in limiting cancer cell invasion and metastasis. ... 

Carter, O., Bailey, G.S., and Dashwood, R.H., The dietary phytochemical chlorophyllin alters E-cadherin and P-catenin expression in human colon cancer cells International Research Conference on Food, Nutrition and Cancer, J. Nutr., 134,3441S, 2004. 

In culture, the human colon carcinoma cell hne Caco-2 spontaneously differentiates at confluency into polarized cells with enterocyte-like characteristics. The principle of this approach consists of following the passage of the compound of interest from the apical or lumen-like sides to the basolateral or lymph-hke sides of Caco-2 cells, thus following the absorption of the compound per se. One obhgate step for fat-soluble nutrients such as carotenoids to cross the intestinal barrier is their incorporation into CMs assembled in the enterocytes. Under normal cell culture conditions, Caco-2 cells are unable to form CMs. When supplemented with taurocholate and oleic acid, Caco-2 cells were reported to assemble and secrete CMs. ... 

Kang, S.Y. et al., Tart cherry anthocyanins inhibit tumor development in Apc(Min) mice and reduce prohferation of human colon cancer cells. Cancer Lett., 194, 13, 2003. 

Extraction procedures must be adjusted when separated anthocyanins will be tested in biological studies. We have found that the types of acids used for anthocyanin extraction as well as their residual concentrations in the final extract may affect the results obtained from biological tests. The growth inhibitory effect of anthocyanins on HT29 (human colonic cancer) cells may be overestimated if the residual acid in the extract exerts a toxic effect on the cells. Acetic acid residues in anthocyanin extracts showed less toxicity to HT29 cells than hydrochloric acid when samples were prepared under the same extraction procedure and subjected to the same tests on HT29 cells. In addition, the procedure to remove acids affected the acid residual concentration as well in final anthocyanin extracts, with lyophilization being more successful than rotary evaporation. 

Inhibition of DNA topo I activity in HCT 116 (human colon carcinoma) cells by CPT, CPT-11, SN-38, TPT, and EGCG (Table 8) ... 

The above three equations (Eqs. 10-12) for the different cell lines are very similar to each other, which suggests that the inhibition against DNA topo I is probably one of the most important antitumor mechanisms for these compounds (CPT, CPT-11, SN-38, TPT, and EGCG) against the three human colon carcinoma (HCT 116, VACO 241, and SW 480) cell lines. In these equations, the number of data points (four or five) is small, but the correlations are statistically significant. 

Caco-2 adenocarcinoma cell line derived from human colon... 

Roulet M, Lucotte M, Farella N, Serique G, Coelho H, Sousa Passes CJ, de Jesus da Silva E, Scavone de Andrade P, Mergler D, Amorim M. 1999. Effects of recent human colonization on the presence of mercury in Amazonian ecosystems. Water Air Soil Pollut 112 297-313. 

The theory underlying the pathophysiology of ischaemia-reperfusion injury, and the role of free radicals in this process has been discussed in detail above. The human colon contains relatively little XO (Parks and Granger, 1986) and so the arguments supporting a role for this enzyme in the pathogenesis of small bowel... 

Fiorelli, G. Picariello, L. Martineti, V. Tonelli, F. Brandi, M. L. Estrogen synthesis in human colon cancer epithelial cells. J. Steroid Biochem. Mol. Biol. 1999, 71, 223-230. 

Li A, Varney ML, Singh RK. Constitutive expression of growth regulated oncogene (gro) in human colon carcinoma cells with different metastatic potential and its role in regulating their metastatic potential. Clin Exp Metastasis 2004 21 571-579. 

PJ Watts, L Barrow, KP Steed, CG Wilson, RC Spiller, CD Melia, MC Davis. The transit rate of different sized model dosage forms through the human colon and the effects of a lactulose-induced catharsis. Int J Pharmaceut 87 215-221, 1992. 

Hidalgo, I. J. Kato, A. Borchardt, R. T., Binding of epidermal growth factor by human colon carcinoma cell (Caco-2) monolayers, Biochem. Biophys. Res. Commun. 160, 317-324 (1989). 

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