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Regulation of TNF-alpha release from bone marrow-derived macrophages by vitamin D

Y Abu-Amer1, Z Bar-Shavit

  • 1Hubert Humphrey Center for Experimental Medicine and Cancer Research, Hebrew University-Hadassah Medical School, Jerusalem, Israel.

Journal of Cellular Biochemistry
|August 1, 1994
PubMed

Insights

Vitamin D (1,25-dihydroxyvitamin D3) enhances the immune response by increasing tumor necrosis factor-alpha (TNF-alpha) production in macrophages. Vitamin D deficiency impairs this crucial immune signaling pathway.

Area of Science:

  • Immunology
  • Endocrinology
  • Cell Biology

Background:

  • 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] is a calcium-regulating hormone with known immunomodulatory effects on macrophages and lymphocytes.
  • Macrophages from vitamin D-deficient mice exhibit reduced phagocytic and tumoricidal activities.
  • Tumor necrosis factor-alpha (TNF-alpha) release by macrophages is critical for tumoricidal function and bone resorption modulation.

Purpose of the Study:

  • To investigate the role of 1,25(OH)2D3 in the synthesis and release of TNF-alpha by macrophages.
  • To determine if vitamin D influences TNF-alpha production in response to common immune stimuli.

Main Methods:

  • Bone marrow-derived macrophages (BMDMs) were cultured from vitamin D-sufficient and vitamin D-deficient mice.
  • TNF-alpha levels in conditioned media were measured after stimulation with lipopolysaccharide (LPS) or interferon-gamma (IFN-gamma).
  • Serum TNF-alpha levels were measured in vivo after LPS injection. Western blot and immunoprecipitation were used to analyze TNF-alpha synthesis.

Main Results:

  • 1,25(OH)2D3 significantly enhanced LPS- and IFN-gamma-induced TNF-alpha release from BMDMs, but did not induce release independently.
  • Mice deficient in vitamin D showed a fourfold reduction in serum TNF-alpha levels following LPS stimulation compared to sufficient mice.
  • Evidence suggests 1,25(OH)2D3 primarily affects TNF-alpha synthesis rather than just its release.

Conclusions:

  • 1,25-dihydroxyvitamin D3 plays a significant role in regulating TNF-alpha secretion by mononuclear phagocytes.
  • Vitamin D status is crucial for maintaining adequate TNF-alpha production, impacting immune cell function and potentially bone metabolism.

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