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• W4384661646 abstract "Abstract Background/Objectives Obesity-associated metabolic dysfunction and inflammation can be ameliorated by bariatric surgery. While obesity is also linked to impaired B cell activation, differentiation, and persistence in response to infection and vaccination little is known about post-operative immune B cell compartment and to what extent dysregulation in B cell pathways can be reversed. To bridge this gap in knowledge, we carried out in-depth evaluation of B cell composition in individuals with obesity prior to and following bariatric surgery compared to lean controls. Subjects/Methods We recruited individuals with obesity (BMI at least 35 kg/m 2 ) before bariatric surgery ( n = 21) and followed them up 6 months post-operatively ( n = 17). As controls we recruited age- and sex-matched lean (BMI < 25) individuals ( n = 18). We carried out comprehensive immunophenotyping of peripheral blood B cells as well as interrogated their association with inflammatory and metabolic parameters. Results In obesity the balance of antigen-inexperienced and memory B cells in the peripheral blood is altered, with an expansion of naïve and a reduction in total memory B cells. 6 months following bariatric surgery this balance is restored. However, post-operative patients are uniquely characterised by an increase in B cell subsets associated with chronic inflammation – CD11c + CXCR5 - IgD - CD27 - double negative 2 (DN2) B cells and CD27 + CD38 ++ plasmablasts. Correlations between B cells subsets, inflammatory and metabolic parameters were distinct in lean people and individuals with obesity pre- and post-bariatric surgery. Conclusions Bariatric surgery patients display a unique B cell profile 6 months post-operatively; this bears minimal resemblance to that of pre-operative patients and only partially overlaps with that of lean controls. Post-operative differences in the B cell compartment compared to lean controls are detected despite global amelioration of inflammation and restoration of metabolic health. Collectively, this indicates that bariatric surgery creates a specific immunometabolic state with potential implications for health outcomes." @default.
• W4384661646 created "2023-07-20" @default.
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• W4384661646 date "2023-07-18" @default.
• W4384661646 modified "2023-10-13" @default.
• W4384661646 title "Distinct B cell profiles characterise healthy weight and obesity pre- and post-bariatric surgery" @default.
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• W4384661646 doi "https://doi.org/10.1038/s41366-023-01344-y" @default.
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