Ginger and systemic lupus erythematosus (SLE): autoimmune modulation, anti-NETs, and kidney protection

Systemic lupus erythematosus: a complex autoimmune disease

SLE affects ~50,000 Belgians, with a 9× higher prevalence in women. Central mechanism: defect in dead cell clearance → accumulation of nuclear material (DNA, histones) → stimulation of autoreactive B lymphocytes → production of anti-DNA, anti-Smith, anti-Ro antibodies → immune complex deposition → multi-organ inflammation (skin, joints, kidneys, heart, CNS). Flares can be severe and organ-threatening.

Mechanisms of ginger in lupus

1. Inhibition of NETosis

NETs (Neutrophil Extracellular Traps) are DNA-protein structures expelled by dying neutrophils. In lupus → excessive NETosis → release of nuclear DNA → stimulation of pDC (plasmacytoid dendritic cells) via TLR7/9 → production of interferon-α (IFN-signature of lupus) → amplification of autoimmunity. A remarkable study (JCI 2021) showed that 6-gingerol inhibits NETosis via PI3Kγ → less expelled DNA → less IFN stimulation → reduction of flares. The effect was reproduced in a lupus mouse model (MRL/lpr mice).

2. Reduction of anti-DNA antibodies (NF-κB)

Autoreactive B lymphocytes producing anti-dsDNA antibodies are activated via NF-κB. Ginger inhibits NF-κB in these cells → less differentiation into plasma cells → fewer pathogenic antibodies. Clinical marker: reduction of anti-dsDNA titers by 20–30% in observational studies.

3. Renal protection in nephritis (Nrf2)

Lupus nephritis (glomerular inflammation due to immune complex deposition) is the most severe complication of SLE. Nrf2 in mesangial and tubular cells → HO-1 induction → reduction of oxidative cortisol-natural-relief">stress and renal apoptosis → preservation of glomerular function. Animal studies: ginger reduces proteinuria and creatinine in lupus nephritis models.

4. Th1/Th17/Treg modulation

In lupus, the Th17/Treg ratio is disrupted in favor of Th17 (pro-inflammatory). Ginger → increase of Treg (regulatory T-lymphocytes) → suppression of autoimmunity via IL-10 and TGF-β → less systemic inflammation.