Abstract
The lack of a suitable animal model that expresses human intestinal mucin genes limits the study of mucin function. The aim of this study was to examine whether human fetal intestinal xenografts, known to model host-restricted interactions with human-specific pathogens, express mucin genes in an appropriate developmental pattern when transplanted into severe-combined immunodeficient (scid) mice. Expression profiles for eight mucin genes were examined in human fetal ileal xenografts transplanted ectopically into scid mice for 10 wk. In situ hybridization was performed on fetal, xenograft, and adult intestinal tissue sections with 35S-labeled oligonucleotides specific to human tandem repeat sequences for MUC1, MUC2, MUC3, MUC4, MUC5AC, MUC5B, MUC6, and MUC7. Hybridization patterns observed with the MUC2, MUC3, MUC4, and MUC5AC probes demonstrated that mucin gene expression in xenografted fetal intestine was comparable to third trimester fetal and/or adult tissues. MUC2 and MUC5AC were expressed in a developmental-specific fashion. MUC5AC, expressed in first and early second trimester fetal bowel, was never detected in intestinal xenografts. MUC2 expression displayed a late fetal and/or adult-type hybridization pattern. MUC3 and MUC4 were not developmentally expressed. Appropriate developmental regulation of known intestinal mucin genes was recorded in ectopically grafted human fetal intestinal xenografts. Adult-like patterns of mucin gene expression in this model system will permit future studies aimed at characterizing cis/trans-acting factors that regulate mucin gene expression and function during development, disease, and wound healing and also in mucin-pathogen interactions during host defense.
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Abbreviations
- scid :
-
severe-combined immunodeficient
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Supported in part by National Institutes of Health grants RO1-HD31852, PO1-DK33506, P30-DK40561, and R37-HD12437.
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Buisine, MP., Aubert, JP., Walker, W. et al. Developmental Patterns of Mucin Gene Expression in Human Fetal Small Intestinal Xenografts Maintained in Severe-Combined Immunodeficient Mice. Pediatr Res 53, 898–904 (2003). https://doi.org/10.1203/01.PDR.0000064582.30004.62
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DOI: https://doi.org/10.1203/01.PDR.0000064582.30004.62
