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1,25(OH)

Zehua Zhang1, Feifan Chen2, Jianhua Li1

  • 1Department of Orthopedics, Southwest Hospital, Third Military Medical University Chongqing, China.

American Journal of Translational Research
|September 14, 2018
PubMed
Summary
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Vitamin D (1,25(OH)2D3) suppresses T helper 1 (Th1) cell differentiation and inflammatory cytokine production via the JAK/STAT pathway. This immune modulation is observed in both vitamin D-sufficient and deficient mice infected with Bacillus Calmette Guerin.

Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • 1,25(OH)2D3 is a hormone with known immune-modulating properties beneficial for T cell-mediated autoimmune diseases.
  • The role of vitamin D in regulating T helper cell responses, particularly Th1 cells, in the context of bacterial infections like Bacillus Calmette Guerin (BCG) requires further elucidation.
  • Understanding the molecular mechanisms underlying vitamin D's effects on T cells is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To investigate the direct effects of vitamin D on CD4+ T cells infected with BCG in both vitamin D receptor-deficient (VDR-/-) and wild-type (WT) mice.
  • To specifically examine how vitamin D influences Th1 cell differentiation and cytokine production.
  • To elucidate the molecular pathways, including the JAK/STAT pathway, involved in vitamin D's action on Th1 cells.
Keywords:
1,25(OH)2D3JAK/STATTh1 cellsVDRinflammatory response

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Main Methods:

  • In vitro studies involved purifying naïve CD4+ T cells from VDR-/- and WT mice, inducing Th1 cell differentiation with BCG, and treating with 1,25(OH)2D3.
  • In vivo studies utilized a vitamin D-deficiency mouse model (VDR-/- and WT mice) vaccinated with BCG.
  • Assays included ELISA to measure cytokine levels (IL-2, IFN-γ, TNF-β) and flow cytometry to analyze Th1/Th2 cell proportions in spleen.

Main Results:

  • In vitro, 1,25(OH)2D3 inhibited Th1 cell differentiation and cytokine production.
  • In vivo, 1,25(OH)2D3 modulated Th cell polarization, inhibiting Th1 and augmenting Th2 cell development in vitamin D-deficient mice post-BCG vaccination.
  • 1,25(OH)2D3 suppressed inflammatory infiltrates and the expression of IL-2, IFN-γ, and TNF-β in the spleen of vitamin D-deficient mice.

Conclusions:

  • 1,25(OH)2D3 suppresses the inflammatory response by inhibiting Th1 cell differentiation and associated cytokine production.
  • The JAK/STAT pathway is activated by 1,25(OH)2D3 in both VDR-/- and WT T cells, suggesting its involvement in mediating vitamin D's effects.
  • Vitamin D plays a significant role in regulating T helper cell responses during BCG infection, offering potential therapeutic implications for inflammatory conditions.