Researchers adapted a centrifugation-based method for the isolation of murine bone marrow and compared it to the traditional flushing method. Analysis of primary hematopoietic stem cells, immune cells, and megakaryocytes revealed a comparable distribution of cellular (sub)populations.
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Researchers showed that relatively large anionic nanoparticles administered intraperitoneally selectively accumulated in tumor-associated macrophages.
[Proceedings of the National Academy of Sciences of the United States of America]
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Haber, T., Cornejo, Y. R., Aramburo, S., Flores, L., Cao, P., Liu, A., Mooney, R., Gilchrist, M., Tirughana, R., Nwokafor, U., Abidi, W., Han, E., Dellinger, T., Wakabayashi, M. T., Aboody, K. S., & Berlin, J. M. (2020). Specific targeting of ovarian tumor-associated macrophages by large, anionic nanoparticles. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1917424117 Cite
QKI-7 is highly expressed in human coronary arterial endothelial cells from diabetic donors, and on blood vessels from diabetic critical limb ischemia patients undergoing a lower-limb amputation.
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Yang, C., Eleftheriadou, M., Kelaini, S., Morrison, T., González, M. V., Caines, R., Edwards, N., Yacoub, A., Edgar, K., Moez, A., Ivetic, A., Zampetaki, A., Zeng, L., Wilkinson, F. L., Lois, N., Stitt, A. W., Grieve, D. J., & Margariti, A. (2020). Targeting QKI-7 in vivo restores endothelial cell function in diabetes. Nature Communications, 11(1), 3812. https://doi.org/10.1038/s41467-020-17468-y Cite
Using human monocyte-derived macrophages (MDMs) from healthy donors, researchers found that cigarette smoke exposure was not associated with significant changes in the production of pro inflammatory cytokines by MDMs.
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da Silva, C. O., Gicquel, T., Daniel, Y., Bártholo, T., Vène, E., Loyer, P., Pôrto, L. C., Lagente, V., & Victoni, T. (2020). Alteration of immunophenotype of human macrophages and monocytes after exposure to cigarette smoke. Scientific Reports, 10(1), 12796. https://doi.org/10.1038/s41598-020-68753-1 Cite
Researchers showed that histone deacetylase 3 was a key epigenetic factor required for avelolar macrophage embryonic development, postnatal homeostasis, maturation, and regeneration from bone marrow.
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Yao, Y., Liu, Q., Adrianto, I., Wu, X., Glassbrook, J., Khalasawi, N., Yin, C., Yi, Q., Dong, Z., Geissmann, F., Zhou, L., & Mi, Q.-S. (2020). Histone deacetylase 3 controls lung alveolar macrophage development and homeostasis. Nature Communications, 11(1), 3822. https://doi.org/10.1038/s41467-020-17630-6 Cite
The authors demonstrated that the absence of hematopoietic CXCL4 ameliorates the myeloproliferative neoplasm phenotype, reduces stromal cell activation and bone marrow fibrosis and decreases the activation of pro-fibrotic pathways in megakaryocytes, inflammation in fibrosis-driving cells and JAK/STAT activation in both megakaryocytes and stromal cells in three murine primary myelofibrosis models.
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Scientists investigated whether a bioengineered scaffold device containing hypoxia‐preconditioned, allogeneic human mesenchymal stem cells combined with the beta‐adrenergic antagonist timolol could improve impaired wound healing in diabetic mice.
[Stem Cells Translational Medicine]
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The authors showed that independently of GSDMD-mediated plasma membrane permeabilization, inflammasome receptors engaged caspase-1 and caspase-8, both of which redundantly promoted activation of apoptotic executioner caspase-3 and caspase-7 in pyroptotic macrophages.
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Using mouse tumor models, the authors showed that macrophage-derived soluble glycoprotein nonmetastatic B (GPNMB) increased tumor growth and metastasis in Gpnmb-mutant mice.
[Cellular & Molecular Immunology]
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Liguori, M., Digifico, E., Vacchini, A., Avigni, R., Colombo, F. S., Borroni, E. M., Farina, F. M., Milanesi, S., Castagna, A., Mannarino, L., Craparotta, I., Marchini, S., Erba, E., Panini, N., Tamborini, M., Rimoldi, V., Allavena, P., & Belgiovine, C. (2020). The soluble glycoprotein NMB (GPNMB) produced by macrophages induces cancer stemness and metastasis via CD44 and IL-33. Cellular & Molecular Immunology, 1–12. https://doi.org/10.1038/s41423-020-0501-0 Cite
Although both caspase-1 and caspase-11 could cleave gasdermin D in macrophages and neutrophils, researchers found that NLRC4-activated caspase-1 triggered pyroptosis in macrophages, but this pathway did not trigger pyroptosis in neutrophils.
C57BL/6 mice were randomly divided into two groups: a control group and a hindlimb suspension group. After four weeks of hindlimb suspension, scientists found that this simulated microgravity condition increased the percentage of monocytes and macrophages and decreased the percentage of B lymphocytes and mature red cells in bone marrow.
[Cell Biology International]
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