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Low-dose IL-2 expands regulatory T cells. High-dose IL-2 expands the cells they exist to restrain. Same cytokine, same receptor family, opposite clinical intent — and the explanation is a receptor su

A T cell does not choose which tissue to defend. The tissue chose it, during priming. A naive T cell has no tropism at all; it acquires one from the dendritic cell that activates it, and the instruct

Immune Regulation in COVID-19: Immunomodulatory Mechanisms against SARS-CoV-2 Infection What is COVID-19?

CD25, a key molecule in immune regulation, is integral to the function of activated lymphocytes and regulatory T cells. It's central in mediating immune responses, with implications in autoimmune

In the periphery, co-stimulation rescues a T cell. In the thymus, the same molecules kill it. A peripheral T cell that engages its receptor without CD80 and CD86 becomes anergic; engage them and it r

Not one immune cytokine on this pathway touches bone. TNF, IL-1β, IL-6 and IL-17A all act on osteoblasts, osteocytes and synovial fibroblasts, and it is those stromal cells that decide between RANKL

Antigen's are foreign molecules recognised by the immune system. Antigens can be protein, carbohydrate, lipid or nucleic acid molecules. Examples include viruses and bacteria as well as fr

Interleukin-21 (IL-21) stands out as a pivotal cytokine in the complex network of immune system communication. Its role in regulating various immune cell types has drawn considerable attention

Immunology · T LymphocytesCD8+ T Cells: Cytotoxic Mechanisms, Memory and ExhaustionCD8+ T cells kill infected and transformed cells directly, and they do it with a specificity nothing else in the immu

The Th1 Pathway In this guide, we will explore the differences between TH1 and TH2 cells, their crucial roles in the immune system, and the contributions of cytokines and transcription f

Complete T Helper Cell Guide: Th1, Th2, Th17 & Functions - Your Ultimate Resource from Assay GenieIn this guide, we will explore the differences between TH1 and TH2 cells, their crucial r

Most immunology is written as though a T cell must first be told what to look for. Three lineages did not read that memo. γδ T cells, invariant NKT cells and MAIT cells leave the thymus with their ef

By Charlotte O'Donnell PhD Similar to IL-33, IL-36R ligands are involved in maintaining intestinal homeostasis. Analogous to IL-33, d is locali

Regulatory T cells cannot make the cytokine they depend on. FOXP3 represses the Il2 locus, so every Treg lives on IL-2 secreted by the conventional T cells it exists to restrain. That asymmetry expla