Large differences in COVID‐19 death rates exist between countries and between regions of the same country. Some very low death rate countries such as Eastern Asia, Central Europe or the Balkans have a common feature of eating large quantities of fermented foods. Although biases exist when examining ecological studies, fermented vegetables or cabbage were associated with low death rates in European countries. SARS‐CoV‐2 binds to its receptor, the angiotensin converting enzyme 2 (ACE2). As a result of SARS‐Cov‐2 binding, ACE2 downregulation enhances the angiotensin II receptor type 1 (AT
1
R) axis associated with oxidative stress. This leads to insulin resistanceas well as lung and endothelial damage, two severe outcomes of COVID‐19. The nuclear factor (erythroid‐derived 2)‐like 2 (Nrf2) is the most potent antioxidant in humans and can block the AT
1
R axis. Cabbage contains precursors of sulforaphane, the most active natural activator of Nrf2. Fermented vegetables contain many lactobacilli, which are also potent Nrf2 activators. Three examples are given: Kimchi in Korea, westernized foods and the slum paradox. It is proposed that fermented cabbage is a proof‐of‐concept of dietary manipulations that may enhance Nrf2‐associated antioxidant effects helpful in mitigating COVID‐19 severity.
Background
COVID‐19 pandemic causes high global morbidity and mortality, and better medical treatments to reduce mortality are needed.
Objective
To determine the added benefit of Cyclosporine‐A (CsA), to low‐dose steroid treatment, in patients with COVID‐19.
Methods
Open‐label, non‐randomized pilot study of patients with confirmed infection of SARS‐CoV2, hospitalized from April to May 2020 at a single center in Puebla, Mexico. Comparative treatment with steroids or CsA plus steroids. Pneumonia severity was assessed by clinical, laboratory, and lung tomography. The death rate was evaluated at 28 days.
Results
209 adult patients were studied, 105 received CsA plus steroids (age 55.3 ±13.3; 69% men), and 104 steroids alone (age 54.06 ±13.8; 61% men). All patients received clarithromycin, enoxaparin, and methylprednisolone or prednisone up to 10 days. Patient´s death was associated with hypertension (RR=3.5) and diabetes (RR=2.3). Mortality was 22 and 35% for CsA and control groups (p=0.02), respectively, for all patients, and 24 and 48.5% for patients with moderate to severe disease (p=0.001). Higher cumulative clinical improvement was seen for the CsA group (Nelson Aalen curve, p=0.001, log‐rank test) in moderate to severe patients. The Cox proportional hazard analysis showed the highest HR improvement value of 2.15 (1.39‐3.34, 95%CI, p=0.0005) for CsA treatment in moderate to severe patients, and HR = 1.95 (1.35‐2.83, 95%CI, p=0.0003) for all patients.
Conclusion
CsA used as an adjuvant to steroid treatment for COVID‐19 patients showed to improve outcomes and reduce mortality, mainly in those with moderate to severe disease. Further investigation through controlled clinical trials is warranted.
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