Obesity differs from diabetes mellitus in antibody and T-cell responses post-COVID-19 recovery

Clin Exp Immunol. 2024 Sep 16;218(1):78-92. doi: 10.1093/cei/uxae030.

Abstract

Objective: Obesity and type 2 diabetes (DM) are risk factors for severe coronavirus disease 2019 (COVID-19) outcomes, which disproportionately affect South Asian populations. This study aims to investigate the humoral and cellular immune responses to SARS-CoV-2 in adult COVID-19 survivors with overweight/obesity (Ov/Ob, BMI ≥ 23 kg/m2) and DM in Bangladesh.

Methods: In this cross-sectional study, SARS-CoV-2-specific antibody and T-cell responses were investigated in 63 healthy and 75 PCR-confirmed COVID-19 recovered individuals in Bangladesh, during the pre-vaccination first wave of the COVID-19 pandemic in 2020.

Results: In COVID-19 survivors, SARS-CoV-2 infection induced robust antibody and T-cell responses, which correlated with disease severity. After adjusting for age, sex, DM status, disease severity, and time since onset of symptoms, Ov/Ob was associated with decreased neutralizing antibody titers, and increased SARS-CoV-2 spike-specific IFN-γ response along with increased proliferation and IL-2 production by CD8 + T cells. In contrast, DM was not associated with SARS-CoV-2-specific antibody and T-cell responses after adjustment for obesity and other confounders.

Conclusion: Ov/Ob is associated with lower neutralizing antibody levels and higher T-cell responses to SARS-CoV-2 post-COVID-19 recovery, while antibody or T-cell responses remain unaltered in DM.

Keywords: COVID-19; T cell; antibody; diabetes mellitus; obesity.

MeSH terms

  • Adult
  • Antibodies, Neutralizing* / blood
  • Antibodies, Neutralizing* / immunology
  • Antibodies, Viral* / blood
  • Antibodies, Viral* / immunology
  • Bangladesh
  • CD8-Positive T-Lymphocytes / immunology
  • COVID-19* / complications
  • COVID-19* / immunology
  • Cross-Sectional Studies
  • Diabetes Mellitus, Type 2* / immunology
  • Female
  • Humans
  • Immunity, Cellular
  • Male
  • Middle Aged
  • Obesity* / complications
  • Obesity* / immunology
  • SARS-CoV-2* / immunology
  • T-Lymphocytes / immunology

Substances

  • Antibodies, Viral
  • Antibodies, Neutralizing