Heterozygous mutations in ELANE, the gene for neutrophil elastase, cause cyclic and congenital neutropenia through the programed cell death of neutrophil progenitors in the bone marrow. Granulocyte colony-stimulating factor is an effective therapy for these diseases, but alternative therapies are needed, especially for patients who do not respond well or are at high risk of developing myeloid malignancies. We developed an HL60 cell model for ELANE neutropenia and previously demonstrated that transient and regulated expression of mutant ELANE causes cell death by accelerated apoptosis. Knocking down the mutant gene or exposure to a potent inhibitor of neutrophil elastase rescued neutrophil development. Because of the great diversity in causative ELANE mutations, we generated stable HL60 clones expressing mutant P139L, C151Y and G214R and compared the effects of elastase inhibitor exposure to an ELANE knock-out line on cell development and function. ATRA induced differentiation demonstrated comparably impaired myeloid cell development for all three lines with upregulated expression of GRP78/BIP, an abnormality corrected by exposure of these cells to the elastase inhibitor MK-0339. The inhibitor and KO of mutant ELANE led to formation of neutrophils with comparable chemotactic and bactericidal capacities. We concluded that both strategies have great potential for the treatment of cyclic and congenital neutropenia. However, an orally absorbed, cell permeable inhibitor of neutrophil elastase, if proven safe and effective in a clinical trial, might be the better alternative to G-CSF or gene editing to treat ELANE neutropenia.
The study ""Experimental Mouse Models of Disseminated Candida auris Infection" provides the first insight into the critical role of C5 in the host antimicrobial defense to disseminated candidiasis caused by C. auris. This study also establishes an inbred A/J mouse model of systemic C. auris infection without drug-induced immunosuppression. C. auris has become the first fungal pathogen causing global public health threat due to its multidrug resistance (MDR) and persistence in hospital and nursing home settings. Currently, as compared to C. albicans, very limited animal models are available to study the progression of non-albicans Candida (NAC) species including C. auris. We have successfully established immunosuppressed C57BL/6, BALB/c and A/J murine models of disseminated candidiasis caused by five clinically significant Candida species: C. albicans, C. glabrata, C. tropicalis, C. parapsilosis and C. auris. Here we also report updated progress of some important mouse models for C. auris infection in the field. These valuable mouse models can be used for the assessment of antifungal drugs, evaluation of potential vaccines and monoclonal antibodies (mAbs) to protect before and after candidiasis, and comparison of pathogenicity of different Candida species.
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