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Cardiovascular Disease and Adiposity / Adipokines, Inflammation, and Metabolic Diseases · Journal article
Frontiers in Immunology · September 8, 2026
Encouraging direction, but not yet definitive.
This cross-sectional study dissects the independent and interactive contributions of obesity and COVID-19 severity on circulating adipokines, cytokines, and immune cell populations in 60 SARS-CoV-2–infected patients. Obesity and severity generally exert distinct effects on the immune landscape, with selective amplification of IL-8, NETs-ISG15, and CD8 Tcm expansion in obese patients at critical disease stage. The findings provide a mechanistic framework but require validation as severity biomarkers and do not establish causal relationships or predict clinical outcomes.
Cross-sectional observational study. 60 patients with confirmed SARS-CoV-2 infection stratified by severity and obesity status (BMI threshold 30 kg/m²).. n = 60.
TNF-α and resistin significantly elevated by obesity as independent main effects (TNF-α p=0.012; resistin p=0.026), with resistin additionally driven by severity (p=0.0001). IL-1β, IL-8, and NETs-ISG15 complexes governed by disease severity (IL-1β p=0.0003; IL-8 p=0.0003; NETs-ISG15 p=0.002); IL-8 and NETs-ISG15 selectively amplified in persons with obesity at critical stage (IL-8 Severe vs. Critical p=0.0002; NETs-ISG15 p=0.015). CD8 Treg cells and low-density granulocytes showed largest severity-driven effects (both p<0.0001) with symmetric depletion and expansion across obesity strata, identified as severity biomarkers independent of metabolic background.
No hard clinical outcomes (mortality, mechanical ventilation, ICU length of stay) linked to immune biomarkers; utility as prognostic or therapeutic targets unvalidated.
Clinicians should recognize that obesity and COVID-19 severity shape immune responses through largely independent mechanisms, with selective amplification of IL-8, NETs-ISG15, and CD8 Tcm in critically ill obese patients. CD8 Treg depletion and low-density granulocyte expansion emerge as severity biomarkers independent of obesity status, potentially useful for stratification; however, these findings require prospective validation and functional studies to translate into clinical decision-making.
A well-designed cross-sectional study dissecting independent and interactive effects of obesity and COVID-19 severity on immune mediators and cell populations, with rigorous statistical approach, but limited by lack of longitudinal follow-up, hard clinical outcomes, or external validation of biomarker utility.
As stated by the source record.
Quoted from the source exactly as published.
Clinicians should recognize that obesity and COVID-19 severity shape immune responses through largely independent mechanisms, with selective amplification of IL-8, NETs-ISG15, and CD8 Tcm in critically ill obese patients. CD8 Treg depletion and low-density granulocyte expansion emerge as severity biomarkers independent of obesity status, potentially useful for stratification; however, these findings require prospective validation and functional studies to translate into clinical decision-making.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background Obesity is a major risk factor for severe COVID-19, yet the immunological mechanisms by which it modifies disease progression remain incompletely characterized. We aimed to dissect the independent and interactive contributions of obesity and COVID-19 severity on circulating adipokines, cytokines, and immune cell populations. Methods Sixty patients with confirmed SARS-CoV-2 infection were stratified by disease severity (Mild/Moderate, n = 8; Severe, n = 30; Critical, n = 22) and obesity status (persons without obesity [PwoO], n = 30; persons with obesity [PwO], n = 30; BMI threshold 30 kg/m²). Serum TNF-α, resistin, IL-1β, IL-8, and NETs-ISG15 complexes were measured alongside circulating Th1, Th2, Th17, CD8 Treg, CD8 Tcm, intermediate monocytes, and low-density granulocytes (LDGs). Statistical analysis used Aligned Rank Transform ANOVA (ART-ANOVA), followed by Kruskal–Wallis and Dunn’s post-hoc test with Holm adjustment within each obesity stratum. Results ART-ANOVA identified three distinct immunological patterns. First, TNF-α and resistin were significantly elevated by obesity as independent main effects (p = 0.012 and p = 0.026), with resistin additionally driven by severity (p = 0.0001). Second, IL-1β, IL-8, and NETs-ISG15 complexes were governed by disease severity (p = 0.0003, p = 0.0003, p = 0.002); IL-1β showed a symmetric Severe-to-Critical elevation across obesity strata, whereas IL-8 and NETs-ISG15 were selectively amplified in PwO at the critical stage (Severe vs. Critical: IL-8 p = 0.0002; NETs-ISG15 p = 0.015). Third, CD8 Treg cells and LDGs showed the largest severity-driven effects (both p < 0.0001), with symmetric depletion and expansion across obesity strata, identifying them as severity biomarkers independent of metabolic background. Th17 cells were suppressed by obesity (p = 0.001) and severity (p = 0.021). CD8 Tcm exhibited a unique obesity × severity interaction (p = 0.009), with a paradoxical expansion in critical PwO patients, absent in PwoO. Conclusion Obesity and COVID-19 severity exert distinct, non-interacting effects on the immune landscape, with three exceptions: TNF-α and IL-8/NETs-ISG15 show obesity-conditional amplification of severity, and CD8 Tcm undergoes an obesity-specific expansion at the critical stage. These findings provide a mechanistic framework for obesity-modified immune responses in COVID-19 and identify candidate biomarkers for severity stratification.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.