Cited by 26RNA Research and SplicingDigestive system and related healthBarrier Structure and Function Studies

α 4 Coordinates Small Intestinal Epithelium Homeostasis by Regulating Stability of HuR

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Chung, Hee Kyoung, Wang, Shelley R., Xiao, Lan, Rathor, Navneeta, Turner, Douglas J., Yang, Peixin, Gorospe, Myriam, Rao, Jaladanki N. +1 more·2018·Molecular and Cellular Biology

Abstract

The mammalian intestinal epithelium is a rapidly self-renewing tissue in the body, and its homeostasis depends on a dynamic balance among proliferation, migration, apoptosis, and differentiation of intestinal epithelial cells (IECs). The protein phosphatase 2A (PP2A)-associated protein α4 controls the activity and specificity of serine/threonine phosphatases and is thus implicated in many cellular processes. Here, using a genetic approach, we investigated the mechanisms whereby α4 controls the homeostasis of the intestinal epithelium. In mice with ablated α4, the small intestinal mucosa exhibited crypt hyperplasia, villus shrinkage, defective differentiation of Paneth cells, and reduced IEC migration along the crypt-villus axis. The α4-deficient intestinal epithelium also displayed decreased expression of different intercellular junction proteins and abnormal epithelial permeability. In addition, α4 deficiency decreased the levels of the RNA-binding protein HuR in the mucosal tissue. In cultured IECs, ectopic overexpression of HuR in α4-deficient cells rescued the production of these intercellular junction proteins and restored the epithelial barrier function to a nearly normal level. Mechanistically, α4 silencing destabilized HuR through a process involving HuR phosphorylation by IκB kinase α, leading to ubiquitin-mediated proteolysis of HuR. These findings indicate that the critical impact of α4 upon the barrier function and homeostasis of the intestinal epithelium depends largely on its ability to regulate the stability of HuR.

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Crossref · 10.1128/mcb.00631-17

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  • In α4 knockout mice, an increased phospho-IKKα/total IKKα ratio leads to increased IKKα-mediated phosphorylation and degradation of HuR.

    “Mechanistically, an increased phospho-IKKα/total IKKα ratio was detected, resulting in increased IKKα-mediated phosphorylation and degradation of the RNA-binding protein HuR.”
  • In α4 knockout mice, crypt cell proliferation is enhanced, crypt-to-villus migration rates are decreased, and apoptosis in the mucosal epithelium is increased.

    “Overall, proliferation of crypt cells was enhanced, crypt-to-villus migration rates were decreased, and apoptosis in the mucosal epithelium was increased.”
  • α4 knockout mice are smaller, weigh less, and have a shorter and thinner gastrointestinal tract.

    “The α4 KO mice were smaller, weighed less, and contained a shorter and thinner gastrointestinal tract.”
  • Forced overexpression of HuR rescues the epithelial barrier function defects in α4 knockout mice.

    “The latter was causally involved, since forced overexpression of HuR could rescue the observed epithelial barrier function defects [99].”
  • A role for PP2A in intestinal development and regulation of intestinal epithelial barrier function is inferred from mice with conditional knockout of α4 in the intestinal epithelium.

    “Finally, a role for PP2A in intestinal development and the regulation of intestinal epithelial barrier function was inferred from mice with a conditional KO of α4 in the intestinal epithelium [99].”

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Authors
Chung, H. K., Wang, S. R., Xiao, L., Rathor, N., Turner, D. J., Yang, P., Gorospe, M., Rao, J. N., & Wang, J.-Y.
Affiliations
  • University of Maryland, Baltimore (US)
  • National Institutes of Health (US)
Corresponding author
  • Rao, Jaladanki N.
  • Wang, Jian-Ying
Venue
Molecular and Cellular Biology
Published
2018-06-01
Volume
38
Issue
11
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2804520871
Cited by
26
References
47
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 6 · 2020: 3 · 2019: 4 · 2018: 2
FWCI
1.33
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Health (DK57819, DK61972, DK68491)
  • Department of Veterans Affairs
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Digestive system and related health
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
HuR, small intestine, crypt-villus axis, Paneth cell differentiation, epithelial barrier function, epithelial permeability, IkappaB kinase alpha, ubiquitin-mediated proteolysis, crypt hyperplasia
MeSH terms
Animals, Cell Differentiation, Cells, Cultured, Epithelial Cells, Homeostasis, Intestinal Mucosa, RNA-Binding Proteins, Apoptosis, Mice, Knockout, Cell Proliferation

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