What does chemokine mean?
A chemokine is one of a family of small signalling proteins that the body uses to steer the movement of immune cells. When tissue is injured or infected, resident cells release chemokines, which diffuse outward and form a chemical gradient; immune cells such as neutrophils and lymphocytes detect this gradient through surface receptors and migrate toward the source. The word blends 'chemo-', referring to chemical attraction, with 'cytokine', the broader class of cell-signalling proteins, reflecting the fact that chemokines are the subset of cytokines specialising in directed cell movement (chemotaxis). Because they orchestrate inflammation, chemokines are central to immunology and are frequent targets of drug development aimed at dampening harmful inflammatory responses. The term belongs to formal scientific register and appears mainly in biomedical literature rather than everyday speech.
nounA chemokine is any of a family of small signalling proteins secreted by cells that attract and guide the movement of immune cells, particularly during inflammation and immune responses.
- Any of a family of small secreted signalling proteins that direct the migration of immune cells via chemotaxis, playing a key role in inflammation and immunity.
"The damaged tissue released chemokines that drew white blood cells to the site of infection."
"Levels of the chemokine CXCL8 rose sharply in patients with acute lung injury."
"Researchers blocked a specific chemokine receptor to prevent immune cells from flooding into the transplanted organ."
Regular plural. Often used generically ('chemokines mediate...') or when referring to multiple members of the family.
"Several chemokines were detected at elevated levels in the synovial fluid of arthritis patients."
Your body runs a microscopic postal service: when you get injured, chemokines are the addresses written on the envelope, telling immune cells exactly where to deliver the inflammation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chemokine
The word 'chemokine' was coined in the late twentieth century as a contraction of 'chemotactic cytokine', combining Greek-derived 'chemo-' (from 'khēmeia', relating to chemistry or chemical action) with 'kine', from 'kinesis', meaning movement. It entered widespread use during the 1980s and 1990s as researchers characterised the growing family of small proteins responsible for directing immune cell traffic. Related terms sharing these roots include 'chemotaxis' and 'cytokine' itself.
How chemokine is actually used
Strictly a scientific and medical term, used almost exclusively in immunology, molecular biology, clinical research, and pharmacology. It would sound out of place in everyday conversation. Chemokines are conventionally named with codes such as CCL2 or CXCL8, so writers often pair the general term with these specific designations.
Easily confused with chemokine
Chemokines are a specific subset of cytokines distinguished by their ability to induce directed cell migration (chemotaxis), whereas cytokines is the broader term for all cell-signalling proteins.
Chemokines act locally over short distances to guide immune cell movement, while hormones are signalling molecules typically transported through the bloodstream to act on distant organs.