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Secondary lymphoid organs, such as lymph nodes and Peyer's patches, develop in the sterile environment of the uterus during embryonic life, whereas solitary intestinal lymphoid tissues (SILT) develop early after birth under the continuous exposure to commensals and potential pathogens. In conclusion, our data demonstrate that different mechanisms, mediated mainly by programmed stimuli, induce the formation of distinct colonic lymphoid tissues, therefore suggesting that these tissues may have different functions. Subsequent dendritic cell recruitment to and gp38 +VCAM-1 + lymphoid stromal cell differentiation within SILTs required LTα B-cell recruitment and follicular dendritic cell differentiation depended on MyD88-mediated signaling, but not the microflora. Furthermore, whereas colonic patch development depended on CXCL13-mediated lymphoid tissue inducer (LTi) cell clustering followed by LTα-mediated consolidation, early LTi clustering at SILT anlagen did not require CXCL13, CCR6, or CXCR3. Here, we show that the two distinct lymphoid tissues of the colon-colonic patches and colonic solitary intestinal lymphoid tissues (SILTs)-can easily be distinguished based on anatomical location, developmental timeframe, and cellular organization.
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Despite such vital functions, their development in the colon is poorly understood. Graphpad Prism 6 Software GraphPad Prism 7.Intestinal lymphoid tissues have to simultaneously ensure protection against pathogens and tolerance toward commensals. System Requirements for GraphPad Prism 7.0 for Mac Graphpad Prism 8 Download
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