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- W4281388314 abstract "Abstract Leukemia cutis or leukemic cell infiltration in skin is one of the common extramedullary manifestations of acute myeloid leukemia (AML) and signifies a poorer prognosis. However, its pathogenesis and maintenance remain understudied. Here, we report massive AML cell infiltration in the skin in a transplantation-induced MLL-AF9 AML mouse model. These AML cells could regenerate AML post-transplantation. Prospective niche characterization revealed that skin harbored mesenchymal progenitor cells (MPCs) with a similar phenotype as BM mesenchymal stem cells. These skin MPCs protected AML-initiating stem cells (LSCs) from chemotherapy in vitro partially via mitochondrial transfer. Furthermore, Lama4 deletion in skin MPCs promoted AML LSC proliferation and chemoresistance. Importantly, more chemoresistant AML LSCs appeared to be retained in Lama4 -/- mouse skin post-cytarabine treatment. Our study reveals the characteristics and previously unrecognized roles of skin mesenchymal niches in maintaining and protecting AML LSCs during chemotherapy, meriting future exploration of their impact on AML relapse. A 40-word summary Sandhow et al have in transplantation-induced AML mouse models demonstrated the leukemia-regenerating capacity of AML cells infiltrated in the skin and the role of skin mesenchymal niches in maintaining/protecting AML cells, providing new insight into the pathology of leukemia cutis." @default.
- W4281388314 created "2022-05-25" @default.
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- W4281388314 date "2022-05-20" @default.
- W4281388314 modified "2023-09-30" @default.
- W4281388314 title "A Mesenchymal Cell Niche in Skin for Acute Myeloid Leukemia" @default.
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- W4281388314 doi "https://doi.org/10.1101/2022.05.20.491183" @default.
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