The DNA component of neutrophil extracellular traps(NET-DNA)is associated with cancer metastasis and chemotherapy resistance.However,recent studies have suggested that NET-DNA contributes to the activation of dendriti...The DNA component of neutrophil extracellular traps(NET-DNA)is associated with cancer metastasis and chemotherapy resistance.However,recent studies have suggested that NET-DNA contributes to the activation of dendritic cells(DCs)and promotes the innate immune response to anticancer immunity.Therefore,exploring therapeutic approaches to inhibit NET-mediated tumor progression while maintaining antitumor immunity is essential.Our groups recently identified CCDC25 as a specific NET-DNA sensor on the cytoplasmic membrane of cancer cells that promotes cancer metastasis.In this study,we performed small-molecule compound screening and revealed that mitoxantrone(MTO)could block the interaction between NET-DNA and CCDC25.Molecular docking results indicated that MTO competed with NET-DNA by binding with the amino acid residues Tyr^(24)(Y24),Glu^(25)(E25),and Asp^(28)(D28)of the crystal structure of CCDC25.More importantly,we conjugated MTO with palmitoleic acids such as di-Pal-MTO to increase its residence time on the cytoplasmic membrane,which increased its inhibitory efficiency and decreased its cytotoxicity.In addition,di-Pal-MTO markedly inhibited the RAC1-CDC42 cascade to alleviate the NET-induced cytoskeleton arrangement and chemotactic migration of cancer cells.In multiple mouse models,di-Pal-MTO can suppress breast cancer metastasis and have synergistic effects with chemotherapeutics.Moreover,di-Pal-MTO promotes NET-DNA-dependent DC activation,leading to the subsequent expression of various chemokines that facilitate the infiltration of CD8^(+) T cells.Overall,we successfully identified a small molecule inhibitor,di-Pal-MTO,with dual effects on tumor repression and the antitumor immune response,which provides a novel therapeutic strategy against breast cancer.展开更多
By visualizing DNA with diamidino phenylindole (DAPI), we found that hypothermal incubation followed by rewarming of human neutrophils resulted in an increased number of DAPI-positive objects representative of extensi...By visualizing DNA with diamidino phenylindole (DAPI), we found that hypothermal incubation followed by rewarming of human neutrophils resulted in an increased number of DAPI-positive objects representative of extensive DNA unfolding seemingly similar to neutrophil extracellular traps (NETs). In contrast to canonical NET formation, diphenylene iodonium (DPI), an NADPH oxidase inhibitor, exhibited negligible effects on formation of the DAPI-positive objects. Moreover, multiple instances of DNA damage were detected in the objects, but not in canonical NETs. Our results thus suggest the potential of hypothermia for triggering DNA structural alteration in neutrophils, which is similar to but distinct from NET formation.展开更多
基金the National Key R&D Program of China(2021YFA0909800)the Natural Science Foundation of China(82222055,32270971,82003859,82488101,82330056,22107124 and 82002786)+2 种基金the Natural Science Foundation of Guangdong Province(2021A15010230 and 2024A1515011150)the China Postdoctoral Science Foundation(2023M734043),the Guangdong Medical Research Foundation(nos.A2020145)the Guangzhou Basic and Applied Basic Research Scheme(2023A04J1765 and 2024A04J4511).
文摘The DNA component of neutrophil extracellular traps(NET-DNA)is associated with cancer metastasis and chemotherapy resistance.However,recent studies have suggested that NET-DNA contributes to the activation of dendritic cells(DCs)and promotes the innate immune response to anticancer immunity.Therefore,exploring therapeutic approaches to inhibit NET-mediated tumor progression while maintaining antitumor immunity is essential.Our groups recently identified CCDC25 as a specific NET-DNA sensor on the cytoplasmic membrane of cancer cells that promotes cancer metastasis.In this study,we performed small-molecule compound screening and revealed that mitoxantrone(MTO)could block the interaction between NET-DNA and CCDC25.Molecular docking results indicated that MTO competed with NET-DNA by binding with the amino acid residues Tyr^(24)(Y24),Glu^(25)(E25),and Asp^(28)(D28)of the crystal structure of CCDC25.More importantly,we conjugated MTO with palmitoleic acids such as di-Pal-MTO to increase its residence time on the cytoplasmic membrane,which increased its inhibitory efficiency and decreased its cytotoxicity.In addition,di-Pal-MTO markedly inhibited the RAC1-CDC42 cascade to alleviate the NET-induced cytoskeleton arrangement and chemotactic migration of cancer cells.In multiple mouse models,di-Pal-MTO can suppress breast cancer metastasis and have synergistic effects with chemotherapeutics.Moreover,di-Pal-MTO promotes NET-DNA-dependent DC activation,leading to the subsequent expression of various chemokines that facilitate the infiltration of CD8^(+) T cells.Overall,we successfully identified a small molecule inhibitor,di-Pal-MTO,with dual effects on tumor repression and the antitumor immune response,which provides a novel therapeutic strategy against breast cancer.
文摘By visualizing DNA with diamidino phenylindole (DAPI), we found that hypothermal incubation followed by rewarming of human neutrophils resulted in an increased number of DAPI-positive objects representative of extensive DNA unfolding seemingly similar to neutrophil extracellular traps (NETs). In contrast to canonical NET formation, diphenylene iodonium (DPI), an NADPH oxidase inhibitor, exhibited negligible effects on formation of the DAPI-positive objects. Moreover, multiple instances of DNA damage were detected in the objects, but not in canonical NETs. Our results thus suggest the potential of hypothermia for triggering DNA structural alteration in neutrophils, which is similar to but distinct from NET formation.
