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• W4386790933 abstract "Abstract Heterotopic ossification (HO) occurs following mechanical trauma and burns, or congenitally in patients suffering from fibrodysplasia ossificans progressiva (FOP). Recently, we demonstrated that inhibitors of phosphatidyl-inositol 3-kinase alpha (PI3Kα) may be a useful therapy for patients undergoing HO. In this study, using the already marketed BYL719/Alpelisib/Piqray drug, we have confirmed further these results, detailed the underlying mechanisms of action, and optimized the timing of the administration of BYL719. We found that BYL719 effectively prevents HO even when administered up to three to seven days after injury. We demonstrate in cell cultures and in a mouse model of HO that the major actions of BYL719 are on-target effects through the inhibition of PI3Kα, without directly affecting ACVR1 or FOP- inducing ACVR1 R206H kinase activities. In vivo , we found that a lack of PI3Kα in progenitors at injury sites is sufficient to prevent HO. Moreover, time course assays in HO lesions demonstrate that BYL719 not only blocks osteochondroprogenitor specification, but also reduces the inflammatory response. BYL719 inhibits the migration, proliferation and expression of pro-inflammatory cytokines in monocytes and mast cells, suggesting that BYL719 hampers the hyper-inflammatory status of HO lesions. Altogether, these results highlight the potential of PI3Kα inhibition as a safe and effective therapeutic strategy for HO." @default.
• W4386790933 created "2023-09-16" @default.
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• W4386790933 date "2023-09-14" @default.
• W4386790933 modified "2023-10-15" @default.
• W4386790933 title "PI3Kalpha inhibition blocks osteochondroprogenitor specification and the hyper-inflammatory response to prevent heterotopic ossification" @default.
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• W4386790933 doi "https://doi.org/10.1101/2023.09.14.557704" @default.
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