Immunology

Immunology is the most human—and the most beautiful—of disciplines. Thanks to B Andrade and M Araujo-Pereira for this very pertinent parallel.

This recent PNAS paper is making headlines. Why? Because it focuses on something extremely familiar - Tattoos!

Researchers explored how tattoo ink interacts with the immune and lymphatic systems and clearly demonstrated that its effects do not occur only at the tattoo's site. Instead, it can have a significant, long-term impact on the draining lymph nodes, which affect immune responses to events like vaccines and potentially many other situations as well.

Particularly relevant in a world where nearly 1 in 3 people is likely to have at least a tattoo. And a great example of how science can talk so directly to the general public when it feels familiar. 

If you want to even begin to really understand how cells work, you need to watch this video first; and then reread all the static imagery text books of biochemistry & molecular biology again with fresh eyes. Excellent video Simon Reid.
#highereducation

A roadmap for defining “extrafollicular” B cell responses

Long-lived plasma cells (LLPCs), which continuously secrete antibodies, play a central role in humoral immunity and form the foundation of effective vaccin

The College’s Clinical Immunology Workforce Report finds critical staff shortages across services that diagnose and treat allergies, autoimmune diseases and immunodeficiencies.
 
Three quarters of UK immunology services report that they do not have enough staff to meet current clinical demand.
 
Dr Patrick Yong, Chair of the College Specialty Advisory Committee for Immunology, quotes:

"This is a sobering report. Many services rely on goodwill and unpaid overtime to keep running. We urgently need to establish more training posts and focus on retaining experienced consultants to ensure safe, effective patient care.”

Patients are facing delays to diagnosis and treatment, while consultants are at risk of burnout. The College is calling for more training posts, better support, and improved workforce planning.

Read the full report and recommendations on our website. https://lnkd.in/eyavzHsp

Researchers in a new #ScienceReview examine the influence that biological sex exerts on the immune system and immune-related diseases.

Learn more: https://scim.ag/4fCsDyA | 19 commentaires sur LinkedIn

Stanford scientists have discovered that cancer cells don’t just use one trick to hide from the immune system—they use two separate “don’t-eat-me” signals to stop macrophages from killing them.

The first signal, CD47, was already famous for acting like an invisibility cloak that tells macrophages to back off, and blocking it with an anti-CD47 antibody is already in human trials.

In the Nature Immunology paper, the same Stanford team also found that tumors use MHC class I as a second stop signal by binding to a macrophage receptor called LILRB1, which suppresses the macrophage’s ability to engulf and destroy the cancer.

When researchers blocked both CD47 and LILRB1 in mice, tumors rapidly filled with immune cells, shrank significantly, and became far easier for the body to clear.

This shows that many cancers survive by running two overlapping escape systems, and turning off both “don’t-eat-me” pathways at once may dramatically boost the immune system’s ability to attack and eliminate tumors. | 17 comments on LinkedIn

Epigenetic and metabolic programming of innate immune cells shapes host defense and disease susceptibility.

Venez découvrir en avant première notre Livret d'Immunologie sur notre stand, ouvrage à destination des élèves en primaire. Il sera bientôt disponible sur notre site internet et sera distribué gratuitement aux enfants par les ambassadeurs de l'immunologie, qui présentent notre belle discipline, à l'occasion de la journée de l'immuno (qui est le 29 avril).

SFI Société Française d'Immunologie
#Immunologie
#vulgarisation
#science
#livre
#systèmeimmunitaire

TIMC Lab
Université Grenoble Alpes | 18 comments on LinkedIn

Immunometabolism, the intersection of cellular metabolism and immune function, has revolutionized our understanding of T cell biology. Changes in cellular metabolism help guide the development of thymocytes and the transition of T cells from naive to effector, memory and tissue-resident states. Innate-like T cells are a unique group of T cells with special characteristics. They respond rapidly, reside mainly in tissues and express T cell receptors with limited diversity that recognize non-peptide antigens. This group includes invariant natural killer T (iNKT) cells, mucosal-associated invariant T (MAIT) cells and some populations of γδ T cells. Different subsets of innate-like T cells rely on specific metabolic pathways that influence their differentiation and function and distinguish them from conventional CD4+ and CD8+ T cells. Although there are differences between innate-like T cell types, they share metabolic and functional features. In this Review, we highlight recent research in this emerging field. Understanding how metabolic programmes differ between innate-like T cells and other T cells may open opportunities for tailoring innate-like T cell responses and adoptive T cell therapies for use in cancer, metabolic and autoimmune diseases. Functional and metabolic properties of innate-like T cells — namely, iNKT cells, MAIT cells and some γδ T cells — differ from those of conventional T cells. This Review describes how metabolic pathways support innate-like T cell properties such as acquisition of effector capability in the thymus, rapid responsiveness, tissue persistence, antigen adaptation and functional flexibility.

The Nobel Prize in Physiology or Medicine 2025 was awarded to Mary E. Brunkow, Fred Ramsdell and Shimon Sakaguchi “for their discoveries concerning peripheral immune tolerance.”

Human tumour cells express mutated and non-mutated proteins that can be processed and presented by these cells as peptides bound to human leukocyte antigen (HLA). Some of these peptides are recognized by cognate T cell receptors as ‘non-self’, leading to specific killing of tumour cells by T cells. This process is fundamental to the success of cancer immunotherapy, which exploits the ability of the immune system to eliminate transformed cells. Mutated antigens (neoantigens) have been implicated in the remarkable therapeutic efficacy of immune checkpoint inhibitors (ICIs), which boost endogenous antitumour immune responses. In recent years, the combination of ICIs with personalized cancer vaccines that target neoantigens and other tumour-specific antigens has emerged as a new therapeutic strategy. However, the robust immune pressure that ICIs exert on cancer cells inevitably amplifies the phenomenon of immune editing, which can allow cancer cells to develop resistance mechanisms that subvert surveillance by the immune system. Diminished antigenicity can be due to defects in the antigen processing and presentation machinery, such as HLA-I/II loss of heterozygosity and loss of functional β2-microglobulin. This poses a considerable challenge for combination therapies that include ICIs and for the design of cancer-specific vaccines. Effective tumour-specific T cell immunity — and the success of cancer immunotherapies — relies on the presentation of antigens via human leukocyte antigen (HLA) molecules. In this Review, Bassani-Sternberg and Huber explore recent advances in understanding the repertoire of tumour-specific antigens, as well as how disruptions in antigen processing and presentation contribute to immune evasion and resistance to immune checkpoint blockade. The authors also highlight how these insights can inform the design of personalized neoantigen-based vaccines and combination therapies aimed at outpacing tumour immunoediting.

Pathogen-consuming cells found in fat tissue also play a part in lipid balance.

The distribution of ~ 2 trillion immune cells in the human body.

Lymphocytes: ~ 40% of the number, and 15% of the mass

Neutrophils: ~ 40% of the number, and 15% of the mass

Macrophages: ~ 10% of the number, and 50% of the mass

🦠 La liste OMS 2024 des bactéries les plus préoccupantes vient d'être publiée dans le Lancet infectious disease https://lnkd.in/eYmnPyAm

💬 Elle est établie par la consultation d'expert du secteur chargée de scorer chaque bactérie selon 8 critères (mortalité, contagiosité, incidence, traitements disponibles etc voir les items en haut de la figure)

Quelques commentaires par rapport au classement 2017 :

- Les bactéries à gram négatif continuent de dominer largement le classement

- Les entérobactéries ont pris les 2 premières places (occupées en 2017 par Acinetobacter et Pseudomonas) ce n'est pas un détail, les entérobactéries sont des bactéries "communautaires" alors que Acineto et Pseudomonas sont essentiellement retrouvées dans les infections hospitalière

- Ainsi les Klebsielles résistantes aux carbapénèmes est maintenant l'espèce bactérienne qui préoccupe le plus, souvent resistante à tous les antibiotiques et très virulentes (on voit son score de mortalité et sa difficulté de traitement élevé sur la figure)

- La tuberculose résistante a été rajoutée et apparait au rang n°4

💡 Ce classement est un bon outil
pour les décideurs pour cibler la recherche anti-bactérienne sur les problèmes les plus importants
et pour le public/les journalistes pour savoir comment interpréter certaines annonces "spectaculaires" de découverte de nouveaux traitements en fonction de la bactérie concernée