Targeting the Hypoxic Microenvironment in Cutaneous Chronic Graft-Versus-Host Disease Through PI3Kδ Inhibition

    November 2024 in “ Blood ”
    Yuxi Xu, Ziyi Hu, Guancui Yang, Yuxuan He, Qing Xu, Ya Zhou, Qi Wang, Xiaodong Xie, Rui Wang, Shijie Yang, Xiaoqi Wang, Qingxiao Song, Xi Zhang
    Studysummary This study found that inhibiting the PI3Kδ enzyme in murine models of cutaneous chronic graft-versus-host disease (cGVHD) reduced skin scores and fibrosis, prevented pathogenic lymphoid structures, and improved survival, suggesting it as a promising therapeutic approach to address the disease's hypoxic pathophysiology. Our plain-language summary of this paper — not a Tressless recommendation.
    The study investigates the role of the hypoxic microenvironment in cutaneous chronic graft-versus-host disease (cGVHD) and explores the therapeutic potential of PI3Kδ inhibition. Using a murine model, researchers found that cGVHD skin lesions are characterized by a hypoxic immune environment driven by IL-13, activating the PI3K-AKT signaling pathway. The study identified four key cell types contributing to cGVHD skin lesions and demonstrated that PI3Kδ inhibition, using Parsaclisib, significantly reduced cGVHD symptoms, including hair loss, skin fibrosis, and improved survival rates. The findings suggest that targeting the hypoxic milieu with PI3Kδ inhibitors could be a promising therapeutic strategy for cGVHD.
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