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Advances in Mechanism of HIV-1 Immune Reconstitution Failure: Understanding Lymphocyte Subpopulations and Interventions for Immunological Nonresponders
CUTTING EDGE
Cutting Edge: First Lung Infection Permanently Enlarges Lymph Nodes and Enhances New T Cell Responses
A single respiratory infection induces lifelong mediastinal lymph node enlargement.
Enlarged lymph nodes enhance immune surveillance and better support memory CD8+ T cell formation following new unrelated infections.
Lung infection experience can moderate pathogenicity of subsequent respiratory infections.
ALLERGY AND OTHER HYPERSENSITIVITIES
Sialyl Lewis X Defines an Activated and Functional Regulatory T Cell Subpopulation in Mice
A subset of murine Tregs expresses sialyl Lewis X (sLex) glycans.
Murine sLex+ Tregs are activated and proliferative subpopulation.
Murine sLex+ Tregs show stronger suppressive activity compared with sLex− Tregs.
ANTIGEN RECOGNITION AND RESPONSES
TLR Engagement Induces an Alternate Pathway for BCR Signaling that Results in PKCδ Phosphorylation
TLRs treatment induces signalosome-independent alternate pathway for BCR signaling.
TLRs treatment phosphorylate and activates tyrosine kinases.
PKCδ phosphorylation occurs in the cytosol through the TLRs induced alternate pathway.
AUTOIMMUNITY
Antibody-Mediated Depletion of Autoreactive T Lymphocytes through PD-1 Improves Disease Outcomes and Visualizes T Cell Activation in Experimental Autoimmune Encephalomyelitis
We used the EAE model to develop imaging and treatment for MS.
PET/CT showed binding of anti–PD-1 Ab to activated T cells.
177Lu–anti–PD-1 Ab killed activated T cells and reduced disease progression.
Altering β Cell Antigen Exposure to Exhausted CD8+ T Cells Prevents Autoimmune Diabetes in Mice
Reducing Ag exposure limits generation of cytotoxic TIM3+ autoreactive T cells.
Widespread Ag expression drives autoreactive CD8+ T cell dysfunction.
Puerarin Alleviates Experimental Autoimmune Thyroiditis by Regulating Macrophages
Puerarin amelioration of Hashimoto’s thyroiditis was macrophage-dependent.
Puerarin treatment exerted anti-inflammatory effects by promoting polarisation of M2 macrophages in HT.
Puerarin treatment inhibited pyroptosis.
Integrin αvβ3 Limits Cytokine Production by Plasmacytoid Dendritic Cells and Restricts TLR-Driven Autoimmunity
αvβ3 negatively regulates TLR7 and TLR9 signaling in pDCs.
αv or β3 deletion from pDCs results in increased IFN-I production.
Mice lacking αvβ3 in pDCs develop accelerated TLR7-driven autoimmunity.
CLINICAL AND HUMAN IMMUNOLOGY
NK Cell–Monocyte Cross-talk Underlies NK Cell Activation in Severe COVID-19
scRNA-seq analysis predicts interactions between NK cells and monocytes in COVID-19.
Monocytes from COVID-19 donors induce activation and proliferation in healthy NK cells.
CD56bright NK cells are activated by monocyte-derived soluble proinflammatory factors.
Iron Is Critical for Mucosal-Associated Invariant T Cell Metabolism and Effector Functions
Activated MAIT cells increase iron uptake via CD71.
MAIT cell metabolism and functionality are dependent on a CD71-iron axis.
IMMUNE REGULATION
The Transcription Factor Zfp335 Promotes Differentiation and Survival of Effector Th1 Cells by Directly Regulating Lmna Expression
Zfp335 deficiency impairs effector CD4+ Th1 cell differentiation and survival.
Zfp335 controls CD4+ Th1 cell generation via Lmna expression.
Disruption of IFNγ, GZMB, PRF1, or LYST Results in Reduced Suppressive Function in Human CD8+ T Cells
CRISPR-Cas9 successfully knocked down target molecules in primary human CD8 T cells
IFN-γ, GzmB, PRF1, and LYST are required for CD8 T cell–mediated suppressive ability
IMMUNE SYSTEM DEVELOPMENT
Dynamic Changes in Lymphocyte Populations Establish Zebrafish as a Thymic Involution Model
Zebrafish thymic involution timing and rising B:T cell ratios resemble those of humans.
RNA-seq of four new dual-transgenic lines reveals distinct T and B cell populations.
Zebrafish represent a new involution model with conserved properties to mammals.
IMMUNOGENETICS
Chickens with a Truncated Light Chain Transgene Express Single-Domain H Chain–Only Antibodies
Transgenic chickens have been engineered to produce chicken VH sdAbs.
These chickens raise robust immune responses upon immunization.
sdAbs from the birds show favorable biophysical properties and antigen recognition.
Complete Genomic Assembly of Mauritian Cynomolgus Macaque Killer Ig-like Receptor and Natural Killer Group 2 Haplotypes
Genomic assemblies of MCM KIR and NKG2 haplotypes were produced from long reads.
A prototype workflow of accurate genotyping of MCM KIR and NKG2 was developed from exome data.
INFECTIOUS DISEASE AND HOST RESPONSE
BHLHE40 Regulates Myeloid Cell Polarization through IL-10–Dependent and –Independent Mechanisms
BHLHE40 promotes GM-CSF–mediated proinflammatory responses.
BHLHE40 regulates inflammation via IL-10–dependent and –independent mechanisms.
Enterovirus 71 Activates Plasmacytoid Dendritic Cell–Dependent PSGL-1 Binding Independent of Productive Infection
Enterovirus 71 activates plasmacytoid dendritic cell–dependent PSGL-1 binding.
Enterovirus 71 was found to activate pDCs independent of productive infection.
INNATE IMMUNITY AND INFLAMMATION
LGP2 Facilitates Bacterial Escape through Binding Peptidoglycan via EEK Motif and Suppressing NOD2–RIP2 Axis in Cyprinidae and Xenocyprididae Families
LGP2 binds PGN and negatively regulates the NOD2–RIP2 axis to promote bacteria escape.
LGP2 binds PGN via the EEK motif in the Cyprinidae and Xenocyprididae families.
The NLRP3 Inflammasome Is a Major Cause of Acute Renal Failure Induced by Polypeptide Antibiotics
Polypeptide antibiotics promote infiltration of macrophages to kidney.
The NLRP3 inflammasome is responsible for polypeptide antibiotic-induced acute renal failure.
THEMIS2 Impairs Antitumor Activity of NK Cells by Suppressing Activating NK Receptor Signaling
THEMIS2 attenuates effector functions of human and mouse NK cells.
THEMIS2 binds to GRB2 and phosphatases.
Deficiency of THEMIS2 enhances antitumor activity of NK cells.
MOLECULAR AND STRUCTURAL IMMUNOLOGY
Bhlhe40 Promotes CD4+ T Helper 1 Cell and Suppresses T Follicular Helper Cell Differentiation during Viral Infection
Bhlhe40 positively and negatively regulates Th1 and Tfh differentiation, respectively.
Bhlhe40 directly binds to Th1 and Tfh genes to facilitate their expression.
MUCOSAL IMMUNOLOGY
Myeloid Cells and Sphingosine-1-Phosphate Are Required for TCRαβ Intraepithelial Lymphocyte Recruitment to the Colon Epithelium
MyD88 is required in myeloid cells for colon IEL recruitment to the epithelium.
Bacteria induce MyD88-dependent S1P production in myeloid cells.
Loss of IELs in a model of chronic bowel inflammation ameliorates disease severity.
EXPRESSIONS OF CONCERN
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Cover Image
Cover Image
On the cover: H&E-stained sagittal section of a 12 mo wild-type zebrafish demonstrating features of thymic involution. The orange-boxed region highlights an atrophied thymus that has been largely replaced by adipose tissue. Thymus-adjacent structures include the gills (ventral), brain (cephalad), and eye (cephalo-ventral). Hasan, A., J. J. Macias, B. Wood, M. Malone-Perez, G. Park, C. A. Foster, and J. Kimble Frazer. 2024. Dynamic changes in lymphocyte populations establish zebrafish as a thymic involution model. J. Immunol. 212: 1733–1743.
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