Issues
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Cover image
Cover Image
Cover: Pseudocolored scanning electron micrograph of a hematopoietic progenitor cell conditionally immortalized by expressing estrogen receptor (ER)-regulated Hoxb8. See article by S. Accarias et al. (jcs236703).
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Special Issue: Cell Biology of the Immune System
FIRST PERSON
CELL SCIENTISTS TO WATCH
ESSAY
CELL SCIENCE AT A GLANCE
Membrane mucins of the intestine at a glance
Summary: Transmembrane mucins cover the surface of many cells, especially those in the intestine. They form a dense glycan coat (glycocalyx) that protects the apical surface of enterocytes.
The plant–pathogen haustorial interface at a glance
Summary: A discussion of the distinct host cell transport routes that underpin the biogenesis and function of plant–pathogen interfaces.
HYPOTHESIS
Membrane trafficking as an active regulator of constitutively secreted cytokines
Summary: Why is membrane trafficking rate-limiting for release of constitutively secreted interleukin-6? We propose that cells monitor and adjust cytokine secretion rates for prevention of septic shock.
REVIEWS
The power from within – understanding the driving forces of neutrophil extracellular trap formation
Summary: This Review explores the forces driving the process of neutrophil extracellular trap (NET) formation, with a focus on the biophysical aspects.
Bone marrow adipose cells – cellular interactions and changes with obesity
Summary: Bone marrow adipocytes share a spatially constricted area with hematopoietic cells, and may act as intermediaries in communicating environmental signals that influence hematopoietic lineage decisions.
p53, cancer and the immune response
Summary: This Review considers how p53 in tumour and stromal cells can function to regulate the immune response.
Imaging of the immune system – towards a subcellular and molecular understanding
Summary: This Review provides a current perspective on live-cell imaging in vitro and in vivo with a focus on the understanding of the immune system at the subcellular and molecular level.
Molecular regulation of the plasma membrane-proximal cellular steps involved in NK cell cytolytic function
Summary: This review highlights the molecular steps involved in the regulation of lytic granule secretion by natural killer cells.
Signalling, sorting and scaffolding adaptors for Toll-like receptors
Summary: This manuscript provides a comprehensive review on canonical and regulatory adaptors for Toll-like receptors.
SHORT REPORTS
Macrophages show higher levels of engulfment after disruption of cis interactions between CD47 and the checkpoint receptor SIRPα
Summary: When a membrane receptor and its membrane ligand are on the same cell, they might interact in cis and modulate trans functions, as shown here for macrophage SIRPα and CD47.
Distinct actin cytoskeleton behaviour in primary and immortalised T-cells
Summary: The emerging idea that the cytoskeletal and biophysical principles are preserved in primary cells and transformed cell lines, and the two can be used to interchangeably examine synaptic actin characteristics, needs careful reconsideration.
RESEARCH ARTICLES
Vav2 lacks Ca2+ entry-promoting scaffolding functions unique to Vav1 and inhibits T cell activation via Cdc42
Summary: The proto-oncoproteins Vav1 and Vav2 regulate immune function. Here, we identify key differences in catalytic specificity and scaffolding function that mediate their divergent impacts on T cell activation.
Identification of serine residues in the connexin43 carboxyl tail important for BCR-mediated spreading of B-lymphocytes
Summary: Mutation of specific serine residues of connexin43 affects B-cell spreading, suggesting that this protein can be considered as a regulator of B-cell responses.
TLR7 trafficking and signaling in B cells is regulated by the MHCII-associated invariant chain
Summary: A new role for CD74, the MHC class II chaperone molecule, in regulating the TLR7 response in B cells.
Cofilin1-driven actin dynamics controls migration of thymocytes and is essential for positive selection in the thymus
Summary: Cofilin1 controlled migration determines the dwelling time of thymocytes in the thymic niches and is essential for positive selection and differentiation into mature CD4 and CD8 single-positive cells.
P2X7 receptor activation increases expression of caveolin-1 and formation of macrophage lipid rafts, thereby boosting CD39 activity
Summary: P2X7 receptor activation triggers the initiation of lipid raft-dependent regulatory pathways that upregulate CD39 activity, contributing to limit macrophage responses and inflammation.
Ca2+-activated cleavage of ezrin visualised dynamically in living myeloid cells during cell surface area expansion
Summary: The cleavage of ezrin, visualised in living cells by the separation of ezrin fluorescently labelled at the N- and C-termini, accompanies Ca2+-induced cell surface expansion.
The Lifeact-EGFP mouse is a translationally controlled fluorescent reporter of T cell activation
Summary: A fluorescent reporter mouse for visualising F-actin structure and dynamics in live cells also reports T cell activation through a translationallly controlled mechanism.
Reactive oxygen species-mediated cytoplasmic stiffening impairs the phagocytic ability of the macrophage
Summary: Here, we explore how the deformability of macrophages impact their phagocytic ability and report a ROS-dependent cytoplasmic stiffening that reduces their phagocytic ability.
RHOA-mediated mechanical force generation through Dectin-1
Summary: The anti-fungal innate immunoreceptor Dectin-1 induces signaling through RHOA, leading to contractile mechanical force generation necessary for phagocytosis.
Adhesion, motility and matrix-degrading gene expression changes in CSF-1-induced mouse macrophage differentiation
Summary: Widespread and profound changes occur in the expression of adhesion, motility and matrix-degrading genes as macrophages differentiate under the influence of CSF-1; the roles of paxillin and leupaxin adhesion proteins are compared.
Myo1e modulates the recruitment of activated B cells to inguinal lymph nodes
Summary: Myo1e participates in the adhesion and migration of activated B cells at high endothelial venules by regulating integrins and the PI3K–FAK–RAC-1 signaling pathway.
RPTPε promotes M2-polarized macrophage migration through ROCK2 signaling and podosome formation
Summary: Protein tyrosine phosphatase ε regulates the leukotriene D4-mediated responses of human monocytes and macrophages through modulation of ROCK2 phosphorylation.
Pan-SHIP1/2 inhibitors promote microglia effector functions essential for CNS homeostasis
Summary: Inhibition of SHIP1 and SHIP2 improves the ability of microglia to phagocytose Aβ and dead neurons. Thus, pan-SHIP1/2 inhibitors might be used to treat Alzheimer's disease.
B cells rapidly target antigen and surface-derived MHCII into peripheral degradative compartments
Summary: B cells rapidly target antigen and surface-derived MHCII into peripheral MHCII compartments compatible with fast antigen processing right after internalisation.
Neutrophil phagocyte oxidase activity controls invasive fungal growth and inflammation in zebrafish
Summary: Live imaging reveals neutrophil NADPH oxidase activity limits fungal growth and excessive inflammation during Aspergillus nidulans infection in larval zebrafish.
Loss of Ca2+ entry via Orai–TRPC1 induces ER stress, initiating immune activation in macrophages
Summary: Channel proteins TRPC1 and Orai1 modulate Ca2+ entry, which inhibits ER-stress induced activation of macrophages and the development of the M1 phenotype.
IL-15Rα membrane anchorage in either cis or trans is required for stabilization of IL-15 and optimal signaling
Summary: Cytokines play a main role in the communication between immune cells to eliminate infected of transformed cells. We reveal how cells finely control the intensity of cytokine signaling.
Epidermal growth factor receptor signaling suppresses αvβ6 integrin and promotes periodontal inflammation and bone loss
Summary: Bacterial biofilms suppress αvβ6 integrin via EGFR signaling in gingival epithelial cells. Blocking EGFR activity reduces alveolar bone loss and inflammation in a ligature-induced experimental periodontitis mouse model.
Rat cytomegalovirus-encoded γ-chemokine vXCL1 is a highly adapted, species-specific agonist for rat XCR1-positive dendritic cells
Summary: Superior activation of G protein-coupled receptor signaling by a viral chemokine might lead to novel ideas for fine-tuning immune responses and improve control of infection.
Novel role of proton-secreting epithelial cells in sperm maturation and mucosal immunity
Summary: Proton-secreting cells lining the epididymal tubule can switch their function to become previously unrecognized regulators of immune responses, while establishing close interactions with spermatozoa.
Discovery of aspirin-triggered eicosanoid-like mediators in a Drosophila metainflammation blood tumor model
Summary: Aspirin administration shrinks blood tumors and resolves inflammation in fruit flies. These effects correlate with high levels of linoleic acid-derived bioactive lipids.
A new role for Notch in the control of polarity and asymmetric cell division of developing T cells
Summary: Notch1, a key regulator of cell fate, acts upstream of cell division to dictate the asymmetric inheritance of T cell fate determinants by daughter cells.
Differential nanoscale organisation of LFA-1 modulates T-cell migration
Summary: T-cell migration depends on the nanoscale organisation of adhesion and regulatory proteins as revealed by single-molecule super-resolution fluorescence microscopy.
FcRn mediates fast recycling of endocytosed albumin and IgG from early macropinosomes in primary macrophages
Summary: The recycling of albumin and IgG in primary mouse macrophages expressing the human FcRn occurs through a novel fast recycling pathway from early macropinosomes to the cell surface, which protects these ligands from degradation.
Live imaging the foreign body response in zebrafish reveals how dampening inflammation reduces fibrosis
Summary: A translucent zebrafish model allows a window on the pathological angiogenic and fibrotic response to suture implantation and how this can be modulated by genetically or pharmacologically dampening inflammation.
DDX56 inhibits type I interferon by disrupting assembly of IRF3–IPO5 to inhibit IRF3 nucleus import
Summary: DDX56 is a negative regulator of virus-triggered IFN-β induction that acts by disruputing the IRF3–IOP5 interaction to inhibit the import of IRF3 into the nucleus.
NKG2D–DAP10 signaling recruits EVL to the cytotoxic synapse to generate F-actin and promote NK cell cytotoxicity
Summary: The NK activating receptor NKG2D–DAP10 recruits EVL to the cytotoxic synapse via a Grb2–VAV1 signaling node to promote F-actin generation, target cell adhesion and the development of cell-mediated cytotoxicity.
TOOLS AND RESOURCES
High-resolution quantification of discrete phagocytic events by live cell time-lapse high-content microscopy imaging
Summary: Engulfment enumeration using high-content microscopy images of live cells phagocytosing in real time provides unprecedented high-resolution temporal data that allows new insights into this fundamental biological process.
Genetic engineering of Hoxb8-immortalized hematopoietic progenitors – a potent tool to study macrophage tissue migration
Summary: Validation of the use of ER-Hoxb8-immortalized hematopoietic progenitors combined with CRISPR/Cas9 technology as a potent tool to investigate macrophage functionalities with a large number of applications.
PREPRINT HIGHLIGHTS
Call for papers: Cell Biology of Mitochondria
We are welcoming submissions for our upcoming special issue: Cell Biology of Mitochondria. This issue will be coordinated by two Guest Editors: Ana J. Garcia-Saez (University of Cologne, Germany) and Heidi McBride (McGill University, Canada). Submission deadline: 1 October 2024.
Focal adhesion kinase signalling – tumour vulnerabilities and clinical opportunities
In this Review, David Schlaepfer and colleagues summarise 30 years of focal adhesion kinase (FAK) research with a view of the ongoing clinical testing of small-molecule FAK inhibitors. The authors touch on how FAK plays an important signal integration role and ultimately functions to guide cellular behaviour. Additionally, the authors discuss how FAK inhibition might present a powerful tool to influence the physiological response to other therapeutic approaches.
JCS-FocalPlane Training Grants
Early-career researchers - working in an area covered by JCS - who would like to attend a microscopy training course, please apply. Deadline dates for 2024 applications: 7 September (decision by week commencing 8 October 2024); 22 November (decision by week commencing 16 December).
Biologists @ 100 - join us in Liverpool in March 2025
We are excited to invite you to a unique scientific conference, celebrating the 100-year anniversary of The Company of Biologists, and bringing together our different communities. The conference will incorporate the Spring Meetings of the BSCB and the BSDB, the JEB Symposium Sensory Perception in a Changing World and a DMM programme on antimicrobial resistance. Find out more and register your interest to join us in March 2025 in Liverpool, UK.
Interview with Journal of Cell Science Editor Rob Parton
Read our interview with Rob Parton, a Cell Scientist to Watch, about his career journey leading him from the UK to the University of Queensland in Brisbane, Australia, the evolution of the membrane trafficking field and his advice for running a highly collaborative lab. As a Journal of Cell Science Editor, Rob brings to the journal his expertise in multiscale analysis of membrane function, membrane microdomains, lipid droplets and advanced microscopy techniques in cell biology.