A comparative study on rat intestinal epithelial cells and resident gut bacteria: (I) effect of hexavalent chromium

Upreti, R. K. ; Shrivastava, R. ; Kannan, A. ; Chaturvedi, U. C. (2005) A comparative study on rat intestinal epithelial cells and resident gut bacteria: (I) effect of hexavalent chromium Toxicology Mechanisms and Methods, 15 (5). pp. 331-338. ISSN 1537-6516

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Official URL: http://informahealthcare.com/doi/abs/10.1080/15376...

Related URL: http://dx.doi.org/10.1080/153765291009804


Toxicants including heavy metals reaching the intestine following ingestion through food and water primarily interact with an ecosystem of eukaryotic and prokaryotic cells. Gut bacteria having a dynamic interrelationship with intestinal epithelial cells are known to play important and specific metabolic, trophic, and protective functions. The present study was undertaken to compare the effects of hexavalent chromium on rat intestinal epithelial cells and the resident gut bacteria following in vitro and in vivo exposures. The survival rate and viability pattern of two types of cells were comparable. Under in vitro conditions, the gut bacteria were quick to reduce Cr (VI) in early time periods, while, at 30 h time, both types of cells showed similar capacity for the reduction of Cr (VI). Chromium intoxication (10 ppm of Cr (VI) in drinking water for 10 weeks) caused significant decrease in membrane alkaline phosphatase and Ca2 +-Mg2 +-ATPase activities of intestinal epithelial cells as well as of three gut bacteria viz. Escherichia coli, Pseudomonas sp, and Lactobacillus sp. Major structural membrane constituents like carbohydrates and phospholipids also showed significant decline in both types of cells. These findings indicate that 10 ppm and higher Cr concentrations may cause toxic insult, resulting in impaired intestinal functional efficacy. It also implies that the gut bacteria can be used at least for preliminary screening of heavy metals gastrointestinal toxicity.

Item Type:Article
Source:Copyright of this article belongs to Informa Healthcare.
Keywords:Chromium Interaction; Cr (VI) Reduction; Escherichia coli; Gut Microflora; Intestinal Bacteria; Intestinal Epithelial Cells; Lactobacillus Sp; Membrane Enzymes; Pseudomonas Sp
ID Code:6761
Deposited On:22 Oct 2010 06:35
Last Modified:28 May 2011 07:15

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