Issues
IN THIS ISSUE
BRIEF REVIEWS
The Complement Receptor C5aR2: A Powerful Modulator of Innate and Adaptive Immunity
ANTIGEN RECOGNITION AND RESPONSES
Identification and Structure of an MHC Class I–Encoded Protein with the Potential to Present N-Myristoylated 4-mer Peptides to T Cells
The rhesus MHC class I allele, Mamu-B*05104, presents 4-mer lipopeptides to CTLs.
Its large, hydrophobic B pocket accommodates the acylated glycine as an anchor.
The T cell epitopic diversity appears to be limited for lipopeptides.
Haptoglobin Acts as a TLR4 Ligand to Suppress Osteoclastogenesis via the TLR4–IFN-β Axis
Hp inhibits osteoclastogenesis via the TLR4–IFN-β axis.
Hp acts as a ligand for TLR4.
Hp promotes IFN-β expression through TLR4.
Influenza A Virus Infection Induces Viral and Cellular Defective Ribosomal Products Encoded by Alternative Reading Frames
We identified an ARF epitope NS1-ARF21–8, encoded by NS1 mRNA of influenza A virus.
NS1-ARF21–8 elicits robust immunodominant TCD8+ response in infected BALB/c mice.
NS1-ARF21–8 precursor (14-residue peptide) has no detectable biological function.
AUTOIMMUNITY
A Precision B Cell–Targeted Therapeutic Approach to Autoimmunity Caused by Phosphatidylinositol 3-Kinase Pathway Dysregulation
Low-dosage p110δ inhibitor therapy prevents PTEN- but not SHP-1–driven autoimmunity.
Effective p110δ inhibitor dosages spare immune responses to exogenous immunogens.
Low-dosage p110δ inhibitor therapy delays T1D progression in VH125.NOD mice.
CLINICAL AND HUMAN IMMUNOLOGY
Targeted Delivery of Curcumin Rescues Endoplasmic Reticulum–Retained Mutant NOX2 Protein and Avoids Leukocyte Apoptosis
Obesity Reduces mTORC1 Activity in Mucosal-Associated Invariant T Cells, Driving Defective Metabolic and Functional Responses
MAIT cells require glycolytic metabolism for their cytokine production.
MAIT cell glycolysis is regulated by mTORC1 and SLC7A5.
MAIT cells display defective glycolytic metabolism in obese adults.
IMMUNE REGULATION
Low-Dose Maraviroc, an Antiretroviral Drug, Attenuates the Infiltration of T Cells into the Central Nervous System and Protects the Nigrostriatum in Hemiparkinsonian Monkeys
Loss of glia limitans and infiltration of T cells in the SN is evident in a monkey model of PD.
Oral maraviroc protected the endothelial monolayer and reduced T cell infiltration.
Oral maraviroc protected the nigrostriatum and improved locomotor activities.
IMMUNE SYSTEM DEVELOPMENT
SSB1/SSB2 Proteins Safeguard B Cell Development by Protecting the Genomes of B Cell Precursors
Combined deficiency of Ssb1 and Ssb2 abrogates early B cell development.
SSB1/2 depletion causes defects in proliferation, genome fragility, and apoptosis.
Mature B cells largely tolerate SSB1/2 loss.
ISWI ATPase Smarca5 Regulates Differentiation of Thymocytes Undergoing β-Selection
ISWI ATPase Smarca5 guides developmental mRNA program of β-selected thymocytes.
Inactivation of Smarca5 gene in developing thymocytes activates p53 and apoptosis.
Smarca5 regulates cell fate decisions of γδ thymocytes and survival of pro-B cells.
IMMUNOTHERAPY AND VACCINES
In Vivo Generation of Gut-Homing Regulatory T Cells for the Suppression of Colitis
DCs engineered to overexpress 1,25(OH)2D and RA augment gut-homing Treg cell induction.
Transfer of the engineered DCs robustly suppresses ongoing experimental colitis.
The engineered DCs require Foxp3+ Treg cells to maximally suppress experimental colitis.
Identification of Neoantigen-Reactive Tumor-Infiltrating Lymphocytes in Primary Bladder Cancer
TILs can be grown from primary bladder tumors.
Neoantigen-reactive TILs can be isolated from a bladder tumor specimen.
INFECTIOUS DISEASE AND HOST RESPONSE
Gasdermin D Protects from Melioidosis through Pyroptosis and Direct Killing of Bacteria
GSDMD-deficient mice are more susceptible to melioidosis.
In vivo production of IL-1β by neutrophils is independent of GSDMD.
GSDMD and pyroptosis are directly microbicidal.
Prostaglandin E2 Inhibits the Ability of Neutrophils to Kill Listeria monocytogenes
PGE2 treatment reduces the ability of PMN to kill Listeria monocytogenes.
Cells from the livers of infected BALB mice produced more PGE2 than those from C57BL/6 mice.
INNATE IMMUNITY AND INFLAMMATION
SIDT1 Localizes to Endolysosomes and Mediates Double-Stranded RNA Transport into the Cytoplasm
Murine SIDT1 colocalizes with late endolysosomes and interacts with long dsRNA [poly(I:C)] but not siRNA or dsDNA.
SIDT1 expression is induced following type I IFN and poly(I:C) stimulation.
Loss of SIDT1 impairs IFNβ production following infection with HSV-1 but does not affect overall survival.
MOLECULAR AND STRUCTURAL IMMUNOLOGY
Structure and Peptidome of the Bat MHC Class I Molecule Reveal a Novel Mechanism Leading to High-Affinity Peptide Binding
The bat MHC I exhibits distinctive structural characteristics.
Significant differences exist in the peptidome between inside the cell and outside the cell.
A cluster of uniquely inserted residues may help promote high-affinity peptide binding.
Healthy Donors Exhibit a CD4 T Cell Repertoire Specific to the Immunogenic Human Hormone H2-Relaxin before Injection
H2-relaxin–specific T cells are detected in the blood of healthy donors.
T cell response to H2-relaxin relies on several CD4 T cell epitopes.
An H2-relaxin–specific T cell repertoire might account for its clinical immunogenicity.
TRANSPLANTATION
IL-3 Triggers Chronic Rejection of Cardiac Allografts by Activation of Infiltrating Basophils
IL-3 induces allograft fibrosis and chronic rejection of heart transplants.
IL-3 exerts profibrotic effects by activation of infiltrating basophils.
IL-6 is an important basophil-derived mediator of fibrosis.
TUMOR IMMUNOLOGY
Antigen Priming with Enantiospecific Cationic Lipid Nanoparticles Induces Potent Antitumor CTL Responses through Novel Induction of a Type I IFN Response
A single delivery of R-DOTAP plus peptide Ag induces regression of large tumors.
R-DOTAP possesses intrinsic immunostimulatory activity mediated by type I IFN.
R-DOTAP activity requires Myd88 but not STING or TRIF, and it activates TLR7 and 9.
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Cover Image
Cover Image
On the cover: Bat MHC class I's Ag binding groove (teal) is different from other reported structures (fish, chicken, and human in magenta, yellow, and cyan, respectively) with a cluster of uniquely inserted residues which can help bat MHC class I promote the binding of high-affinity peptides. The (2Fo-Fc) map of these differential residues is shown. Qu, Z., Z. Li, L. Ma, X. Wei, L. Zhang, R. Liang, G. Meng, N. Zhang, and C. Xia. 2019. Structure and peptidome of the bat MHC class I molecule reveal a novel mechanism leading to high-affinity peptide binding. J. Immunol. 202: 3493–3506.
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