The heterogeneity of the SARS-CoV-2 immune responses has become considerably more complex over time and diverse immune imprinting is observed in vaccinated individuals. Despite vaccination, following the emergence of the Omicron variant, some individuals appear more susceptible to primary infections and reinfections than others, underscoring the need to elucidate how immune responses are influenced by previous infections and vaccination. IgG, IgA, neutralizing antibodies and T-cell immune responses in 1,325 individuals (955 of which were infection-naive) were investigated before and after three doses of the BNT162b2 vaccine, examining their relation to breakthrough infections and immune imprinting in the context of Omicron. Our study shows that both humoral and cellular responses following vaccination were generally higher after SARS-CoV-2 infection compared to infection-naive. Notably, viral exposure before vaccination was crucial to achieving a robust IgA response. Individuals with lower IgG, IgA, and neutralizing antibody responses postvaccination had a significantly higher risk of reinfection and future Omicron infections. This was not observed for T-cell responses. A primary infection before Omicron and subsequent reinfection with Omicron dampened the humoral and cellular responses compared to a primary Omicron infection, consistent with immune imprinting. These results underscore the significant impact of hybrid immunity for immune responses in general, particularly for IgA responses even after revaccination, and the importance of robust humoral responses in preventing future infections.
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http://dx.doi.org/10.1038/s41467-023-41342-2 | DOI Listing |
Clin Transl Oncol
December 2024
Lillian S Wells Department of Neurosurgery at the University of Florida: University of Florida Lillian S Wells Department of Neurosurgery, Gainesville, FL, USA.
Glioblastoma (GBM) is one of the most common primary malignant brain tumors. Annually, there are about six instances recorded per 100,000 inhabitants. Treatment for GB has not advanced all that much.
View Article and Find Full Text PDFDiscov Oncol
December 2024
Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
Background: Low-grade glioma (LGG) is a slow-growing but invasive tumor that affects brain function. Histone deacetylases (HDACs) play a critical role in gene regulation and tumor progression. This study aims to develop a prognostic model based on HDAC-related genes to aid in risk stratification and predict therapeutic responses.
View Article and Find Full Text PDFInflammopharmacology
December 2024
Department of Pharmacy, Integral University, Lucknow, 226026, India.
Introduction: Coronavirus disease 2019 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has resulted in a cataclysmic pandemic. Several SARS-CoV-2 mutations have been found and reported since the COVID-19 pandemic began. After the Alpha, Beta, Gamma, and Delta variants, the Omicron (B.
View Article and Find Full Text PDFInflammation
December 2024
Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, 230022, Anhui, China.
Endoplasmic reticulum stress (ERs) is implicated in antitumor immunity. However, the exact role of ERs in mediating the effects of dendritic cells (DCs) is not unclear. In this study, we explored the role of exosomes derived from ER-stressed hepatocellular carcinoma (HCC) cells in the antitumor effects of DCs and the precise underlying mechanism.
View Article and Find Full Text PDFJ Clin Immunol
December 2024
Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, University of Bologna, Bologna, Italy.
Background: Activated Phosphoinositide 3-Kinase (PI3K) δ Syndrome (APDS), an inborn error of immunity due to upregulation of the PI3K pathway, leads to recurrent infections and immune dysregulation (lymphoproliferation and autoimmunity).
Methods: Clinical and genetic data of 28 APDS patients from 25 unrelated families were collected from fifteen Italian centers.
Results: Patients were genetically confirmed with APDS-1 (n = 20) or APDS-2 (n = 8), with pathogenic mutations in the PIK3CD or PIK3R1 genes.
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