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Updated: Jun 26, 2026

Quantitative Imaging of Lineage-specific Toll-like Receptor-mediated Signaling in Monocytes and Dendritic Cells from Small Samples of Human Blood
Published on: April 16, 2012
Nrf2 activation by sulforaphane restores the age-related decrease of T(H)1 immunity: role of dendritic cells
Hyon-Jeen Kim1, Berenice Barajas, Meiying Wang
1Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, CA 90095, USA.
Restoring glutathione levels with Nrf2 activators like sulforaphane (SFN) and N-acetyl cysteine (NAC) can reverse age-related declines in cellular immunity, specifically T helper 1 (TH1) responses and contact hypersensitivity (CHS). This highlights a key mechanism for combating immune senescence.
Area of Science:
- Immunology
- Aging Research
- Cellular Biology
Background:
- Cellular immunity declines with age, a significant public health concern.
- Dendritic cell (DC) redox balance is crucial for cellular immunity; its disruption contributes to immune senescence.
- Age-related immune decline impacts T helper 1 (TH1) immunity and contact hypersensitivity (CHS).
Purpose of the Study:
- To investigate the role of DC redox equilibrium in age-related decreases in CHS and TH1 immunity.
- To determine if restoring glutathione (GSH) levels via the Nrf2 pathway can counteract age-related immune decline.
Main Methods:
- Assessed CHS response in old mice with Nrf2 deficiency or boosted GSH levels using sulforaphane (SFN) or N-acetyl cysteine (NAC).
- Evaluated the impact of SFN and NAC on restoring TH1 immunity by treating DCs ex vivo before adoptive transfer and in vivo challenge.
- Studied the effect of Nrf2 deficiency on age-associated CHS decline.
Main Results:
- Aging reduced CHS response, exacerbated by Nrf2 deficiency.
- Systemic SFN treatment restored CHS by upregulating antioxidant enzymes and GSH synthesis via Nrf2.
- Ex vivo treatment of DCs from old mice with SFN or NAC restored their ability to induce CHS upon adoptive transfer.
Conclusions:
- SFN and NAC treatments enhance TH1 immunity in aging.
- These interventions work by restoring redox equilibrium in dendritic cells.
- Targeting the Nrf2-mediated antioxidant pathway offers a strategy to combat immune senescence.
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