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Nairz et al. show that Salmonella infected macrophages produce nitric oxide, which increases the cell's expression of the iron transport protein ferroportin-1, driving iron out of the cell and thus limiting bacterial growth. The image shows a cluster of Salmonella bacteria. Artwork by Rachel Urkowitz (rachelurk@earthlink.net).
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Article
Nitric oxide–mediated regulation of ferroportin-1 controls macrophage iron homeostasis and immune function in Salmonella infection
NOS2-derived nitric oxide drives ferroportin-1–mediated iron export in Salmonella-infected macrophages, thus limiting bacterial growth.
The link between antibodies to OxLDL and natural protection against pneumococci depends on DH gene conservation
Germline DH sequences are required for the generation of natural antibodies reactive to bacterial phosphorylcholine but not for those reactive to self-antigen.
p53 integrates host defense and cell fate during bacterial pneumonia
p53 deletion augments neutrophil-mediated bacterial clearance in the lung at the expense of tissue homeostasis, leading to increased mortality.
Role of host cell traversal by the malaria sporozoite during liver infection
Malaria sporozoites cross the liver sinusoidal barrier, target Kupffer cells and endothelial cells with cell traversal inhibiting sporozoite clearance.
Innate lymphoid cells sustain colon cancer through production of interleukin-22 in a mouse model
Neutralization of IL-22 production from colonic innate lymphoid cells reduces dysplasia in bacterial-induced colon cancer by reducing proliferation of epithelial cells via reduced activation of Stat3.
MHC II tetramers visualize human CD4+ T cell responses to Epstein–Barr virus infection and demonstrate atypical kinetics of the nuclear antigen EBNA1 response
Characterization of the human EBV-specific CD4+ T cell response using MHC II tetramers reveals the latent EBV antigen response is more frequent than the lytic response with a delayed EBNA1 response that coincides with diminished cross-presentation.
In vivo NCL targeting affects breast cancer aggressiveness through miRNA regulation
The regulatory protein nucleolin controls the expression of a subset of miRNAs involved in breast cancer progression and can be targeted to inhibit breast cancer growth in vivo.
Coordinated transcriptional regulation of bone homeostasis by Ebf1 and Zfp521 in both mesenchymal and hematopoietic lineages
Absence of the transcriptional regulator Zfp521 results in decreased bone formation by osteoblasts and increased osteoclast differentiation, largely via Zfp521’s regulation of the transcription factor Ebf1.
Sirt1 ablation promotes stress-induced loss of epigenetic and genomic hematopoietic stem and progenitor cell maintenance
Loss of Sirt1 causes increased Hoxa9 expression and expansion of HSPC subsets under hematopoietic stress, resulting in increased DNA damage and exhaustion of long-term progenitors.
MPN patients harbor recurrent truncating mutations in transcription factor NF-E2
Mutations in the transcription factor NF-E2 in patients with myeloproliferative neoplasms result in a truncated protein that enhances the function of wild-type NF-E2 and causes erythrocytosis and throbocytosis in a mouse model.
Attenuating homologous recombination stimulates an AID-induced antileukemic effect
Inhibition of the RAD51 homologous recombination factor prevents the repair of AID-initiated DNA breaks and induces apoptosis preferentially in AID-expressing human CLL.
Similar antigen cross-presentation capacity and phagocytic functions in all freshly isolated human lymphoid organ–resident dendritic cells
Tonsil-resident BDCA1+ DCs, BDCA3+ DCs, and pDCs all cross-present antigen efficiently.
Antigen delivery to early endosomes eliminates the superiority of human blood BDCA3+ dendritic cells at cross presentation
Human BDCA3 DCs are superior to BDCA1 DCs at antigen cross presentation when delivered to late endosomes and lysosomes but not when delivered to early endosomes.
