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BLOOD COMMENTARIES

HEMATOPOIESIS AND STEM CELLS

CD16a, the immunoglobulin G Fc receptor FcγRIIIa, is an important mediator of antibody-dependent cell-mediated cytotoxicity. Zhu et al engineered induced pluripotent stem cell–derived natural killer (NK) cells with a modified CD16a that provide an off-the-shelf NK cell product with improved antitumor activity for targeting both hematological and solid malignancies.

LYMPHOID NEOPLASIA

Spontaneous regression is a rare event in chronic lymphocytic leukemia (CLL), estimated to occur in 1 to 2 percent of patients. The authors analyze phenotypic, functional, and genomic features of sequential samples from patients with spontaneous regression, providing insight into the interaction of genetic and microenvironmental features modulating CLL cell proliferation.

THROMBOSIS AND HEMOSTASIS

Ischemia-perfusion injury leads to extension of tissue loss following ischemic stroke. Denorme et al demonstrated in mouse knockout models that platelet cyclophilin D induces platelet necrosis, and necrotic platelet-neutrophil aggregates amplify ischemic injury. Targeting cyclophilin D limits ischemia-reperfusion injury without risking bleeding by inhibiting platelet function.

TRANSFUSION MEDICINE

Azouzi et al used combined genomic and proteomic analysis to show that the molecular basis for the rare PEL-negative red cell phenotype is a large deletion of the ABCC4/MRP4 gene, which encodes a widely expressed ATP-binding cassette (ABC) transporter. ABCC4 negativity alters multidrug resistance and impairs platelet aggregation.

TRANSPLANTATION

The authors compare 4 conditioning regimens for older patients undergoing allogeneic hematopoietic stem cell transplantation, confirming better outcomes with reduced-intensity melphalan-based conditioning.

LETTER TO BLOOD

The authors dissect the transcriptional regulatory pathway by which the iron regulatory hormone hepcidin is suppressed by erythroferrone in response to erythropoietin.

BLOOD WORK

ERRATUM

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