ArticleFrontiers in immunology2026
Targeting Bruton tyrosine kinase with acalabrutinib attenuates murine sclerodermatous chronic graft versus host disease.
Article in Frontiers in immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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9 authors.
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Abstract
Background: Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is considered the only curative option for certain malignant hematopoietic disorders, yet its benefits are limited by the development of graft-versus-host disease (GVHD). Chronic GVHD (cGVHD) is often characterized by chronic inflammation and fibrosis, propagated by alloreactive donor B- and T-cell involvement. Bruton tyrosine kinase (BTK) is the downstream effector in the B-cell receptor signaling pathway and further has a crucial role in mast cell activation, both of which are critical in the pathogenesis of cGVHD. Selective inhibition of BTK may be beneficial in ameliorating cGVHD pathogenesis. In this study, we evaluated the efficiency of acalabrutinib, a highly selective Bruton tyrosine kinase inhibitor, using a murine sclerodermatous cGVHD model. Methods: Recipient BALB/c mice received total body irradiation (800cGy), followed by infusion of bone marrow and splenocytes of either syngeneic (BALB/c) or allogeneic (B10.D2) mice, and were subsequently treated with acalabrutinib or control starting three weeks after HSCT until the end of week 8. Mice were monitored for clinical signs of GVHD, survival, organ pathology of skin and other organs, and inflammatory mediator expression in serum and skin. RNA sequencing and immunohistochemistry were performed in skin to understand the pharmacological mechanisms of BTK inhibition in sclerodermatous cGVHD. Results: Acalabrutinib treatment showed better survival, improved clinical cGVHD scores, and reduced skin pathology. Significant reductions in dermal thickness and skin fibrosis, and mast cell numbers in the acalabrutinib-treated group. Conclusion: Our results demonstrate that specific inhibition of BTK with acalabrutinib has a potentially beneficial role in ameliorating sclerodermatous cGVHD by improving the survival and clinical benefits and warrants further investigation in patients with cGVHD.
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