In vivo gene expression profiling of human intestinal epithelial cells: Analysis by laser microdissection of formalin fixed tissues

Michael D. George, Jan Wehkamp, Robert J. Kays, Christian M. Leutenegger, Sadiah Sabir, Irina Grishina, Satya Dandekar, Charles L Bevins

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Background: The small intestinal epithelium mediates vital functions of nutrient absorption and host defense. The spatial organization of the epithelial cells along the crypt-villus axis segregates them into regions of specialized function. However, the differences in transcriptional programming and the molecular machinery that governs the migration, adhesion, and differentiation of intestinal epithelial cell lineages in humans remain under-explored. To increase our understanding of these mechanisms, we have evaluated gene expression patterns of ileal epithelial cells isolated by laser capture microdissection from either the villus epithelial or crypt cell regions of healthy human small intestinal mucosa. Expression profiles in villus and crypt epithelium were determined by DNA microarray, quantitative real-time PCR, and immunohistochemistry based methods. The expression levels of selected epithelial biomarkers were also compared between gastrointestinal tissues. Results: Previously established biomarkers as well as a novel and distinct set of genes believed to be linked to epithelial cell motility, adhesion, and differentiation were found to be enriched in each of the two corresponding cell populations (GEO accession: GSE10629). Additionally, high baseline expression levels of innate antimicrobials, alpha defensin 5 (HD5) and regenerating islet-derived 3 alpha (Reg3A), were detected exclusively within the small bowel crypt, most notably in the ileum in comparison to other sites along the gastrointestinal tract. Conclusion: The elucidation of differential gene expression patterns between crypt and villus epithelial cell lineages in human ileal tissue provides novel insights into the molecular machinery that mediates their functions and spatial organization. Moreover, our findings establish an important framework of knowledge for future investigations of human gastrointestinal diseases.

Original languageEnglish (US)
Article number209
JournalBMC Genomics
Volume9
DOIs
StatePublished - May 5 2008

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Microdissection
Gene Expression Profiling
Formaldehyde
Lasers
Epithelial Cells
Cell Lineage
Intestinal Mucosa
Biomarkers
alpha-Defensins
Laser Capture Microdissection
Gene Expression
Gastrointestinal Diseases
Oligonucleotide Array Sequence Analysis
Ileum
Cell Adhesion
Cell Movement
Gastrointestinal Tract
Real-Time Polymerase Chain Reaction
Cell Differentiation
Epithelium

ASJC Scopus subject areas

  • Medicine(all)

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In vivo gene expression profiling of human intestinal epithelial cells : Analysis by laser microdissection of formalin fixed tissues. / George, Michael D.; Wehkamp, Jan; Kays, Robert J.; Leutenegger, Christian M.; Sabir, Sadiah; Grishina, Irina; Dandekar, Satya; Bevins, Charles L.

In: BMC Genomics, Vol. 9, 209, 05.05.2008.

Research output: Contribution to journalArticle

George, Michael D. ; Wehkamp, Jan ; Kays, Robert J. ; Leutenegger, Christian M. ; Sabir, Sadiah ; Grishina, Irina ; Dandekar, Satya ; Bevins, Charles L. / In vivo gene expression profiling of human intestinal epithelial cells : Analysis by laser microdissection of formalin fixed tissues. In: BMC Genomics. 2008 ; Vol. 9.
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