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PILLARS OF IMMUNOLOGY
Counting on You: How MHC Tetramers Revolutionized the Study of T Cell Memory and CD8+ T Cell Exhaustion
CLINICAL AND HUMAN IMMUNOLOGY
Comprehensive Immunologic Evaluation of Bronchoalveolar Lavage Samples from Human Patients with Moderate and Severe Seasonal Influenza and Severe COVID-19
Humans with severe viral pneumonia have excessive cytokines in the lower airways.
This inflammation is associated with influxes of monocytes and activated lymphocytes.
Blood IP-10 concentration correlates with lung inflammation and severe disease.
Th22 Cells Are a Major Contributor to the Mycobacterial CD4+ T Cell Response and Are Depleted During HIV Infection
IL-22 responses to mycobacterial Ags contributed ∼50% of the total response.
Mycobacterial Th22 responses were significantly lower in HIV-infected individuals.
IMMUNE REGULATION
Quorum Sensing by Gelsolin Regulates Programmed Cell Death 4 Expression and a Density-Dependent Phenotype in Macrophages
High macrophage cell density upregulates PDCD4 expression.
Secreted GSN is a quorum-sensing autoinducer of macrophages.
miR-21–GSN-PDCD4 regulatory network regulates the macrophage inflammatory response.
STAT5 Represses a STAT3-Independent Th17-like Program during Th9 Cell Differentiation
Human Th9 cells exhibit a STAT5-mediated gene suppression signature.
IL-2/STAT5 suppresses a STAT3-independent Th17-like phenotype in Th9 cells.
IL-17 production by IL-2–deprived Th9 cells requires Rorγt and BATF.
Differential Regulation of ATP- and UTP-Evoked Prostaglandin E2 and IL-6 Production from Human Airway Epithelial Cells
ATP and UTP stimulate P2Y2 receptors to induce PGE2 via CRAC channels and cPLA2.
ATP activates P2X receptors to induce IL-6 via CRAC channels and NFAT signaling.
P2Y2 and P2X receptors and CRAC channels are attractive targets for airway diseases.
Neuropilin-1 Is Expressed on Highly Activated CD4+ Effector T Cells and Dysfunctional CD4+ Conventional T Cells from Naive Mice
Nrp-1 expression is induced on a subset of CD4+Foxp3− T cells upon stimulation.
Stimulation-induced iNrp-1+CD4+Foxp3− T cells exhibit a highly activated phenotype.
Pre-existing nNrp-1+CD4+Foxp3− T cells from naive mice are dysfunctional.
IMMUNOTHERAPY AND VACCINES
Multimodal Intralesional Therapy for Reshaping the Myeloid Compartment of Tumors Resistant to Anti–PD-L1 Therapy via IRF8 Expression
ISIM reduces PMN-MDSCs and CX3CR1+ M-MDSCs in the tumor.
ISIM upregulates PD-L1 in intratumoral MDSCs and synergizes with anti–PD-L1 therapy.
Deletion of IRF8 in myeloid cells increases PMN-MDSCs and causes poor outcome.
FcRn-Targeted Mucosal Vaccination against Influenza Virus Infection
A trimeric HA-Fc protein is characterized by its binding with HA mAbs or FcRn.
FcRn-targeted nasal immunization with HA-Fc induces mucosal and systemic immunity.
FcRn-mediated nasal delivery of HA-Fc confers protection from influenza infection.
INFECTIOUS DISEASE AND HOST RESPONSE
MicroRNA-21 Deficiency Promotes the Early Th1 Immune Response and Resistance toward Visceral Leishmaniasis
miR-21 is upregulated in myeloid cells and organs during L. donovani infection.
Lack of miR-21 enhances IL-12 production and Th1 response during L. donovani infection.
miR-21−/− hosts are more resistant to VL caused by L. donovani.
NK Cell Responses in Zika Virus Infection Are Biased towards Cytokine-Mediated Effector Functions
NK cells from ZIKV-infected patients produced high levels of IFN-γ and TNF-α.
Overproduction of IFN-γ by NK cells is correlated with STAT-5 activation.
Cytokine production is mediated by MIC molecules expressed by ZIKV+ cells.
Protracted yet Coordinated Differentiation of Long-Lived SARS-CoV-2-Specific CD8+ T Cells during Convalescence
Longitudinal CyTOF analysis of tetramer+ SARS-CoV-2–specific CD8+ T cells was performed.
Nucleocapsid-specific T and Ab responses are coordinated.
Self-renewing potential and polyfunctionality of tetramer+ cells change over convalescence.
Critical Role of Zinc Transporter (ZIP8) in Myeloid Innate Immune Cell Function and the Host Response against Bacterial Pneumonia
ZIP8 is upregulated in macrophages and DCs after bacterial stimulation.
ZIP8 loss augments lung inflammation, bacterial dissemination, and mortality.
ZIP8 loss increases NF-κB signaling and alters T cell priming.
IFN-γ Drives TNF-α Hyperproduction and Lethal Lung Inflammation during Antibiotic Treatment of Postinfluenza Staphylococcus aureus Pneumonia
IFN-γ drives lethal lung inflammation during postinfluenza MRSA pneumonia.
IFN-γ promotes inflammatory cytokine storm during postinfluenza MRSA pneumonia.
TNF-α hyperproduction exacerbates inflammatory lung damage.
Ubiquitin Specific Protease 1 Expression and Function in T Cell Immunity
Usp1 is expressed in activated T cells and interacts with Id2 and Id3.
Usp1 loss affects CD8+ T cells responding to secondary but not primary infection.
Usp1-deficient memory CD8+ T cells have diminished Id2 protein and proliferation.
Protein Immunization Induces Memory CD4+ T Cells That Lack Th Lineage Commitment
Protein immunization induces lineage-nonpolarized effector CD4 T cells.
Nonpolarized memory cells become Th1 cells during the recall response to infection.
Viral infection restricts GC Tfh cell formation compared with protein immunization.
Critical Roles of Phosphoinositide 3-Kinase δ in the Humoral Immune Response to Trypanosoma congolense Infection
PI3Kδ is essential for protective humoral immune responses against trypanosomes.
PI3Kδ promotes IL-10 responses that antagonize early control of parasite growth.
INNATE IMMUNITY AND INFLAMMATION
RACK1 T50 Phosphorylation by AMPK Potentiates Its Binding with IRF3/7 and Inhibition of Type 1 IFN Production
Myeloid RACK1 deficiency renders mice resistant to viral infection.
Virus infection enhances RACK1 T50 phosphorylation via AMPK activation.
RACK1 T50 phosphorylation promotes the binding and consequent inhibition of IRF3/7.
Non-Lyn Src Family Kinases Activate SIRPα–SHP-1 to Inhibit PI3K–Akt2 and Dampen Proinflammatory Macrophage Polarization
SIRPα controls TLR agonist– and IFN-γ–induced macrophage proinflammatory activation.
SIRPα deficiency exacerbates type I diabetes and peritonitis in mice.
SFK(s), but not Lyn, phosphorylate SIRPα to recruit SHP-1 in proinflammatory states.
Activation of Transcription Factor 4 in Dendritic Cells Controls Th1/Th17 Responses and Autoimmune Neuroinflammation
Transcription factor TCF4 in DCs protects against autoimmune neuroinflammation.
TCF4 regulates p38 MAPK activation and proinflammatory cytokine expression in DCs.
TCF4 activation in DCs limits pathological effector T cell differentiation.
Virus Infection Induces Keap1 Binding to Cytokine Genes, Which Recruits NF-κB p50 and G9a-GLP and Represses Cytokine Transcription
Keap1 moderates cytokine induction upon virus infection by binding to chromatin.
Keap1 is required for NF-κB p50 and G9a-GLP recruitment, which represses transcription.
Keap1 forms complexes with NF-κB p50 and NF-κB p65 that bind chromatin in living cells.
Role of Endosomal TLRs in Staphylococcus aureus Infection
Lack of individual TLRs had moderate or no effect on anti–S. aureus host defenses.
Simultaneous absence of TLR7, 9, and 13 results in hypersusceptibility to S. aureus.
Immune recognition of S. aureus is mediated by the concerted action of TLR7/9/13.
TUMOR IMMUNOLOGY
IL-33 Induces Sema4A Expression in Dendritic Cells and Exerts Antitumor Immunity
IL-33 stimulates DCs to express Sema4A and exerts antitumor immunity.
Sema4A expression on DCs activates CTLs via Sema4A–Plexin B2 axis.
NOVEL IMMUNOLOGICAL METHODS
Converting an Anti-Mouse CD4 Monoclonal Antibody into an scFv Positron Emission Tomography Imaging Agent for Longitudinal Monitoring of CD4+ T Cells
In this study, we convert an anti-CD4 Ab into an scFv-based immuno-PET tracer.
This short-lived PEGylated probe can noninvasively monitor CD4+ T cells in mice.
This approach should be applicable to any clinically useful Ig.
Continuous Culture of Mouse Primary B Lymphocytes by Forced Expression of Bach2
A Bach2 transgene enables unlimited growth of B cells cultured with CD154 and IL-21.
Bach2-transgenic cell lines have stable BCRs and transduce signals upon BCR ligation.
B cells secrete large quantities of Ig after the Bach2 transgene is silenced.
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Cover Image
Cover Image
On the cover: IL9-expressing CD4 T cells (i.e., Th9 cells) in allergic individuals exhibit a strong STAT5-repressive gene signature, indicating that STAT5 transcriptional repression may play an important role in their differentiation. This work demonstrates that STAT5 enhances Th9 development by suppressing a novel STAT3-independent Th17-like differentiation program. Canaria, D. A., B. Yan, M. G. Clare, Z. Zhang, G. A. Taylor, D. L. Boone, M. Kazemian, and M. R. Olson. 2021. STAT5 represses a STAT3-independent Th17-like program during Th9 cell differentiation. J. Immunol. 207: 1265–1274.
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