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Bronchiolitis obliterans syndrome is associated with increased senescent lymphocytes in the small airways. | LitMetric

Bronchiolitis obliterans syndrome is associated with increased senescent lymphocytes in the small airways.

J Heart Lung Transplant

Chronic Inflammatory Disease Laboratory, Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, Australia; Department of Medicine, University of Adelaide, Adelaide, Australia; South Australian Lung Transplant Service, Adelaide, Australia.

Published: February 2021

AI Article Synopsis

Article Abstract

Background: Immunosuppression therapy is ineffective at preventing bronchiolitis obliterans syndrome (BOS), primarily a disease of the small airways (SAs). Our previous reports show increased senescent CD28null T and natural killer T (NKT)-like cells in the peripheral blood of patients with BOS and increased cytotoxic, proinflammatory lymphocytes in the SAs. We hypothesized that the cytotoxic, proinflammatory lymphocytes in the SAs would be steroid-resistant senescent CD28null lymphocytes.

Methods: Intracellular cytotoxic mediator granzyme B, interferon (IFN)-γ and tumor necrosis factor (TNF)-α proinflammatory cytokines, and CD28 were measured in the blood, bronchoalveolar lavage, large airway, and SA brushing T and NKT-like cells from 10 patients with BOS, 11 stable lung transplant recipients, and 10 healthy age-matched controls. SA brushings were cultured in the presence of ±1 µmol/liter prednisolone, ±5 mg/liter theophylline, and ±2.5 ng/ml cyclosporine A, and IFN-γ and TNF-α proinflammatory cytokines were assessed using flow cytometry.

Results: Increased SA CD28null T and NKT-like cells were identified in patients with BOS compared with that in the controls and stable transplant recipients. Loss of CD28 was associated with increased T and NKT-like cells expressing granzyme B, IFN-γ, and TNF-α. Loss of CD28 expression by CD8+ T cells was significantly associated with forced expiratory volume in 1 sec (R = 0.655, p = 0.006) and with time after transplantation (R = -0.552, p = 0.041). Treatment with prednisolone + theophylline + cyclosporin A inhibited IFN-γ and TNF-α production by SA CD28null CD8+ T and NKT-like cells additively.

Conclusions: BOS is associated with the loss of CD28 in SA cytotoxic, proinflammatory senescent T and NKT-like lymphocytes. Treatment options that target the proinflammatory nature of these cells in the SAs may improve graft survival.

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Source
http://dx.doi.org/10.1016/j.healun.2019.12.005DOI Listing

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