E-GEOD-34253 - Dietary heme modulates microbiota and mucosa of mouse colon without significant host-microbe cross talk

Released on 18 July 2013, last updated on 29 July 2013
Mus musculus
Samples (2)
Array (1)
Protocols (7)
Previously, we showed that dietary heme injured the colonic surface epithelium and induced hyperproliferation by changing the surface to crypt signaling. In this study we investigated whether bacteria play a role in this changed signaling. Dietary heme increased the Bacteroidetes and decreased the Firmicutes in colonic content. This shift was caused by a selective susceptibility of Gram-positive bacteria to the heme cytotoxic fecal waters, which is not observed for Gram-negative bacteria allowing expansion of the Gram-negative community. The increased amount of Gram-negative bacteria increased LPS exposure to colonocytes, however, there is no appreciable immune response detected in the heme-fed mice. There were no signs of sensing of the bacteria by the mucosa, as changes in TLR signaling were not present. This lack of microbe-host cross talk indicated that the changes in microbiota do not play a causal role in the heme-induced hyperproliferation. Mice received control or heme diet for 14 days, whereafter pooled colon samples were analysed on microarrays.
Experiment type
transcription profiling by array 
Guido Hooiveld <guido.hooiveld@wur.nl>, Anneke Rijnierse, Michael Muller, Noortje IJssennagger, Roelof v Meer
Investigation descriptionE-GEOD-34253.idf.txt
Sample and data relationshipE-GEOD-34253.sdrf.txt
Raw data (1)E-GEOD-34253.raw.1.zip
Processed data (1)E-GEOD-34253.processed.1.zip
Array designA-AFFY-130.adf.txt