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Innate PI3K p110δ regulates Th1/Th17 development and microbiota-dependent colitis.

Publication ,  Journal Article
Steinbach, EC; Kobayashi, T; Russo, SM; Sheikh, SZ; Gipson, GR; Kennedy, ST; Uno, JK; Mishima, Y; Borst, LB; Liu, B; Herfarth, H; Ting, JPY ...
Published in: J Immunol
April 15, 2014

The p110δ subunit of class IA PI3K modulates signaling in innate immune cells. We previously demonstrated that mice harboring a kinase-dead p110δ subunit (p110δ(KD)) develop spontaneous colitis. Macrophages contributed to the Th1/Th17 cytokine bias in p110δ(KD) mice through increased IL-12 and IL-23 expression. In this study, we show that the enteric microbiota is required for colitis development in germfree p110δ(KD) mice. Colonic tissue and macrophages from p110δ(KD) mice produce significantly less IL-10 compared with wild-type mice. p110δ(KD) APCs cocultured with naive CD4+ Ag-specific T cells also produce significantly less IL-10 and induce more IFN-γ- and IL-17A-producing CD4+ T cells compared with wild-type APCs. Illustrating the importance of APC-T cell interactions in colitis pathogenesis in vivo, Rag1(-/-)/p110δ(KD) mice develop mild colonic inflammation and produced more colonic IL-12p40 compared with Rag1(-/-) mice. However, CD4+ CD45RB(high/low) T cell Rag1(-/-)/p110δ(KD) recipient mice develop severe colitis with increased percentages of IFN-γ- and IL-17A-producing lamina propria CD3+D4+ T cells compared with Rag1(-/-) recipient mice. Intestinal tissue samples from patients with Crohn's disease reveal significantly lower expression of PIK3CD compared with intestinal samples from non-inflammatory bowel disease control subjects (p < 0.05). PIK3CD expression inversely correlates with the ratio of IL12B:IL10 expression. In conclusion, the PI3K subunit p110δ controls homeostatic APC-T cell interactions by altering the balance between IL-10 and IL-12/23. Defects in p110δ expression and/or function may underlie the pathogenesis of human inflammatory bowel disease and lead to new therapeutic strategies.

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Published In

J Immunol

DOI

EISSN

1550-6606

Publication Date

April 15, 2014

Volume

192

Issue

8

Start / End Page

3958 / 3968

Location

United States

Related Subject Headings

  • Th17 Cells
  • Th1 Cells
  • TOR Serine-Threonine Kinases
  • Microbiota
  • Mice, Knockout
  • Mice
  • Male
  • Macrophages
  • Intestinal Mucosa
  • Interleukin-10
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Steinbach, E. C., Kobayashi, T., Russo, S. M., Sheikh, S. Z., Gipson, G. R., Kennedy, S. T., … Plevy, S. E. (2014). Innate PI3K p110δ regulates Th1/Th17 development and microbiota-dependent colitis. J Immunol, 192(8), 3958–3968. https://doi.org/10.4049/jimmunol.1301533

Published In

J Immunol

DOI

EISSN

1550-6606

Publication Date

April 15, 2014

Volume

192

Issue

8

Start / End Page

3958 / 3968

Location

United States

Related Subject Headings

  • Th17 Cells
  • Th1 Cells
  • TOR Serine-Threonine Kinases
  • Microbiota
  • Mice, Knockout
  • Mice
  • Male
  • Macrophages
  • Intestinal Mucosa
  • Interleukin-10