Specific Expression of Apolipoprotein A-IV in the Follicle-Associated Epithelium of the Small Intestine

Daisuke Tokuhara, Tomonori Nochi, Akiko Matsumura, Mio Mejima, Yuko Takahashi, Shiho Kurokawa, Hiroshi Kiyono, Yoshikazu Yuki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Background: Peyer’s patches (PPs), which are covered by specialized follicle-associated epithelium (FAE) including M cells, play a central role in immune induction in the gastrointestinal tract. This study is to investigate a new molecule to characterize PPs. Methods: We generated a monoclonal antibody (mAb 10-15-3-3) that specifically reacts to the epithelium of PPs and isolated lymphoid follicles. Target antigen was analyzed by immunoprecipitation and mass spectrometry. Localization and expression of target antigen were evaluated by immunofluorescence, in situ hybridization and real-time PCR. Results: Immunoprecipitation and mass spectrometry revealed that mAb 10-15-3-3 recognized apolipoprotein A-IV (ApoA-IV), a well-known lipid transporter; this finding was confirmed by the specific reactivity of mAb 10-15-3-3 to cells transfected with the murine ApoA-IV gene. Immunofluorescence using mAb 10-15-3-3 showed intestinal localization of ApoA-IV, in which strong expression of the ApoA-IV protein occurred throughout the entire intestinal epithelium during developing period before weaning but was restricted to the FAE in adult mice. In support of these findings, in situ hybridization showed strong expression of the ApoA-IV gene throughout the entire intestinal epithelium during developing period before weaning, but this expression was restricted to the FAE predominantly and the tips of villi to a lesser extent in adult mice. Deficiency of ApoA-IV had no effect on the organogenesis of PP in mice. Conclusions: Our current results reveal ApoA-IV as a novel FAE-specific marker especially in the upper small intestine of adult mice.

Original languageEnglish
Pages (from-to)2682-2692
Number of pages11
JournalDigestive Diseases and Sciences
Volume59
Issue number11
DOIs
Publication statusPublished - 2014 Nov 18
Externally publishedYes

Keywords

  • Apolipoprotein A-IV
  • Epithelial cell
  • Mucosal immunology
  • Peyer’s patch

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology

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