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Musashi-1 suppresses expression of Paneth cell-specific genes in human intestinal epithelial cells.

Abstract：

BACKGROUND:Musashi-1 (Msi-1) is a RNA-binding protein, known as a putative marker of intestinal stem cells (ISCs). However, little is known about the function of Msi-1 within human intestinal epithelial cells (IECs). Thus, the present study aimed to clarify the role of Msi-1 in differentiation and proliferation of IECs. METHODS:A human intestinal epithelial cell line stably expressing Msi-1 was established. Proliferation of the established cell lines was measured by bromodeoxyuridine incorporation, whereas differentiation were assessed by reverse transcriptase-polymerase chain reaction (RT-PCR) analysis of lineage-specific genes. Activities of the Notch and Wnt pathways were examined either by reporter assays or expression of downstream target genes. The distribution of Msi-1 and PLA2G2A expression in vivo was determined by immunohistochemistry. RESULTS:Constitutive expression of Msi-1 in IECs had no significant effect on cell proliferation, but suppressed expression of Paneth cell-specific genes, including PLA2G2A. Msi-1 appeared to suppress expression of the PLA2G2A gene at the mRNA level. Analysis of Notch and Wnt pathway activity, however, revealed no significant change upon Msi-1 expression. The expression of Msi-1 and PLA2G2A in vivo was restricted to IECs residing at the lowest part of the human intestinal crypt, but was clearly separated to within basal columnar cells or mature Paneth cells, respectively. CONCLUSIONS:Msi-1 suppresses expression of Paneth cell-specific genes in IECs, presumably through a pathway independent from Notch or Wnt. These findings suggest Msi-1 is a negative regulator of Paneth cell differentiation, an may contribute to maintain the undifferentiated phenotype of ISCs.

journal_name

J Gastroenterol

journal_title

Journal of gastroenterology

authors

Murayama M,Okamoto R,Tsuchiya K,Akiyama J,Nakamura T,Sakamoto N,Kanai T,Watanabe M

doi

10.1007/s00535-008-2284-4

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

173-82

issue

3

eissn

0944-1174

issn

1435-5922

journal_volume

44

pub_type

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