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  • Free Research Articles, Red Cells, Iron, and Erythropoiesis, CME article, 〈a href="/content/by/section/Editorials"〉Editorials〈/a〉, Clinical Trials and Observations  (1)
  • Inaugural Articles  (1)
  • 2010-2014  (2)
  • 1
    Publication Date: 2011-09-07
    Description: During human CMV infection, there is a preferential expansion of natural killer (NK) cells expressing the activating CD94–NKG2C receptor complex, implicating this receptor in the recognition of CMV-infected cells. We hypothesized that NK cells expanded in response to pathogens will be marked by expression of CD57, a carbohydrate antigen expressed on highly mature cells within the CD56dimCD16+ NK cell compartment. Here we demonstrate the preferential expansion of a unique subset of NK cells coexpressing the activating CD94–NKG2C receptor and CD57 in CMV+ donors. These CD57+NKG2Chi NK cells degranulated in response to stimulation through their NKG2C receptor. Furthermore, CD57+NKG2Chi NK cells preferentially lack expression of the inhibitory NKG2A receptor and the inhibitory KIR3DL1 receptor in individuals expressing its HLA-Bw4 ligand. Moreover, in solid-organ transplant recipients with active CMV infection, the percentage of CD57+NKG2Chi NK cells in the total NK cell population preferentially increased. During acute CMV infection, the NKG2C+ NK cells proliferated, became NKG2Chi, and finally acquired CD57. Thus, we propose that CD57 might provide a marker of “memory” NK cells that have been expanded in response to infection.
    Keywords: Inaugural Articles
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 2
    Publication Date: 2012-11-23
    Description: The Pediatric Hydroxyurea Phase 3 Clinical Trial (BABY HUG) was a phase 3 multicenter, randomized, double-blind, placebo-controlled clinical trial of hydroxyurea in infants (beginning at 9-18 months of age) with sickle cell anemia. An important secondary objective of this study was to compare clinical events between the hydroxyurea and placebo groups. One hundred and ninety-three subjects were randomized to hydroxyurea (20 mg/kg/d) or placebo; there were 374 patient-years of on-study observation. Hydroxyurea was associated with statistically significantly lower rates of initial and recurrent episodes of pain, dactylitis, acute chest syndrome, and hospitalization; even infants who were asymptomatic at enrollment had less dactylitis as well as fewer hospitalizations and transfusions if treated with hydroxyurea. Despite expected mild myelosuppression, hydroxyurea was not associated with an increased risk of bacteremia or serious infection. These data provide important safety and efficacy information for clinicians considering hydroxyurea therapy for very young children with sickle cell anemia. This clinical trial is registered with the National Institutes of Health (NCT00006400, www.clinicaltrials.gov ).
    Keywords: Free Research Articles, Red Cells, Iron, and Erythropoiesis, CME article, 〈a href="/content/by/section/Editorials"〉Editorials〈/a〉, Clinical Trials and Observations
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
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