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The Interleukin Family
Crucial signaling cytokines that regulate the growth, differentiation, and behavior of immune cells.
Interleukins (ILs) are a highly critical subset of cytokines that play a crucial role in cell communication within the immune system. Originally named because they were observed to be expressed by white blood cells (leukocytes) acting on other leukocytes, we now know they are produced by a wide variety of body cells. Interleukins regulate the growth, differentiation, and behaviour of immune cells by binding to specific high-affinity cell surface receptors.
There are different types of interleukins, and each type serves specific functions in regulating the immune response. For example, some interleukins promote inflammation to help the body fight infections, while others regulate the immune response to prevent excessive inflammation and maintain immune balance (homeostasis).
Interleukins are categorised into distinct protein families according to their structural similarities and the receptors they bind to, such as the IL-1, IL-2, IL-6, IL-10, IL-12, and IL-17 families.
Clinical Significance: The interleukin family has become a crucial focus for drug development, particularly monoclonal antibody therapies. Several of these biologic drugs are already available in the market and hold a substantial portion of the pharmaceutical industry for treating autoimmune diseases, inflammatory disorders, and various cancers.
IL-1 Family
The interleukin-1 (IL-1) family consists of 11 cytokines that play crucial roles in regulating acute and chronic inflammatory responses. They are heavily involved in the activation of the innate immune system and are closely tied to inflammasome biology. Members of the IL-1 family include IL-1α, IL-1β, IL-1 receptor antagonist (IL-1Ra), IL-18, IL-33, IL-36α, IL-36β, IL-36γ, and IL-37.
IL-2 Family
The interleukin-2 (IL-2) family primarily consists of cytokines that share the common gamma-chain (γc) receptor subunit. They play significant roles in regulating immune responses, particularly in the activation, proliferation, and survival of lymphocytes.
Apart from IL-2, other members of the IL-2 family include IL-4, IL-7, IL-9, IL-15 and IL-21. Each of these cytokines has distinct roles: IL-4 is critical for B cell activation and Th2 differentiation, while IL-15 plays a pivotal role in the survival of Natural Killer (NK) cells and memory T cells.
IL-6 Family
The interleukin-6 (IL-6) family shares the glycoprotein 130 (gp130) receptor subunit. IL-6 itself is highly pleiotropic, stimulating immune responses, triggering the acute-phase response in the liver during infection, and influencing bone metabolism and hematopoiesis.
Members of the IL-6 family include IL-6, IL-11, IL-27, IL-31, oncostatin M (OSM), leukemia inhibitory factor (LIF), cardiotrophin-1 (CT-1), cardiotrophin-like cytokine (CLC) and ciliary neurotrophic factor (CNTF).
IL-10 Family
The interleukin-10 (IL-10) family comprises cytokines that generally exert immunosuppressive and anti-inflammatory effects. They are essential for preventing immunopathology by turning off the inflammatory cascade once an infection has been cleared.
Members of the IL-10 family include IL-10, IL-19, IL-20, IL-22, IL-24 and IL-26. Beyond immune suppression, several of these (like IL-22) are vital for epithelial tissue repair and maintaining barrier integrity in the gut and skin.
IL-12 Family
The interleukin-12 (IL-12) family is unique because its members are heterodimeric, meaning they are composed of two different protein subunits. They act as critical bridges between the innate and adaptive immune systems.
Members of the IL-12 family include IL-12, IL-23, IL-27, and IL-35. These cytokines are instrumental in guiding the differentiation of naive T-cells into specialised subsets (e.g., Th1, Th17) to combat specific types of intracellular pathogens or fungi.
IL-17 Family
The interleukin-17 (IL-17) family comprises cytokines heavily involved in mucosal immunity, defense against extracellular bacteria and fungi, and the pathogenesis of autoimmune conditions like psoriasis and rheumatoid arthritis.
Members of the IL-17 family include IL-17A, IL-17B, IL-17C, IL-17D, IL-17E (also known as IL-25), and IL-17F. They act primarily by recruiting neutrophils and stimulating the production of antimicrobial peptides.
Featured Interleukin Reagents
To support your immunology and inflammation research, Biorbyt offers a comprehensive catalogue of highly validated interleukin bioreagents. Whether you require active proteins for cell culture or sensitive detection kits for biomarker analysis, explore our top categories:
Primary Antibodies Anti-Interleukin Antibodies Highly specific monoclonal and polyclonal antibodies for Western Blot, IHC, and Flow Cytometry. Recombinant Proteins Active IL Cytokines Bioactive, high-purity recombinant interleukins tailored for cell culture and functional assays. Detection Kits Interleukin ELISA Kits Ready-to-use sandwich ELISA kits for precise quantification of ILs in serum, plasma, and supernatants.
External Resources & Further Reading
For more detailed structural, genetic, and literature information regarding the Interleukin families, consider exploring the following authoritative databases:
- UniProt Knowledgebase (UniProtKB) - For comprehensive protein sequence and functional information.
- NCBI PubMed - Search for the latest peer-reviewed literature and clinical trials involving Interleukin pathways.
- Brocker, C. et al. (2010). Evolutionary divergence and functions of the human interleukin (IL) gene family. Human Genomics. doi:10.1186/1479-7364-5-1-30