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Ascorbic acid is a potent inhibitor of various forms of T cell apoptosis
J D Campbell1, M Cole, B Bunditrutavorn
1Department of Microbiology, Oregon State University, Corvallis, Oregon, 97331, USA.
Abstract:
This study was designed to examine the effect of ascorbic acid (vitamin C) on various death pathways of mouse T cells. Unlike humans, mice produce their own ascorbic acid and our study tested the effect of additional ascorbic acid on murine T cells. Our data show that three T cell death pathways (growth factor withdrawal-, spontaneous-, and steroid-induced death) were inhibited when T cells were incubated with ascorbic acid. The data show that both activated and resting T cells were responsive to ascorbic acid since both populations were resistant to death stimuli when treated with ascorbic acid. Additionally, effector T cells were more likely to enter S phase if treated with ascorbic acid. Our data implicate ascorbic acid as a potent inhibitor of various forms of T cell death and suggest that vitamin C may function as an immune booster through this mechanism.
Insights
Ascorbic acid (vitamin C) significantly inhibited multiple T cell death pathways in mice. This suggests vitamin C may boost immune function by protecting T cells from death stimuli.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Mice, unlike humans, synthesize their own ascorbic acid (vitamin C).
- The impact of supplemental ascorbic acid on murine T cell viability and function is not fully understood.
- T cells play a crucial role in adaptive immunity.
Purpose of the Study:
- To investigate the effects of ascorbic acid on distinct T cell death pathways in mice.
- To determine if ascorbic acid influences both resting and activated T cell populations.
- To explore the potential of ascorbic acid as an immune-modulating agent.
Main Methods:
- Murine T cells (both activated and resting) were incubated with varying concentrations of ascorbic acid.
- T cell death was induced via growth factor withdrawal, spontaneous death, and steroid treatment.
- Cell proliferation, specifically entry into S phase, was assessed in effector T cells.
Main Results:
- Ascorbic acid demonstrated significant inhibition of growth factor withdrawal-, spontaneous-, and steroid-induced T cell death.
- Both activated and resting T cells exhibited increased resistance to death stimuli when treated with ascorbic acid.
- Ascorbic acid treatment promoted cell cycle progression (S phase entry) in effector T cells.
Conclusions:
- Ascorbic acid acts as a potent inhibitor of multiple T cell death pathways in murine models.
- Vitamin C may enhance immune responses by preserving T cell populations.
- These findings highlight a potential therapeutic role for ascorbic acid in immune support.