What does autacoid mean?
An autacoid is any of several substances that occur naturally within the body and act as local messengers, regulating physiological processes at or near the site where they are produced. The term covers a diverse group of compounds, including histamine, serotonin, prostaglandins, and nitric oxide, which influence functions such as inflammation, blood flow, smooth-muscle contraction, and pain sensation. Unlike classical hormones, which travel through the bloodstream to act on distant organs, autacoids generally exert their effects over short distances and brief periods, after which they are rapidly broken down or reabsorbed. The word derives from the Greek roots meaning 'self' and 'remedy', reflecting early ideas that these agents were the body's own healing substances. Autacoid is chiefly encountered in pharmacology, physiology, and medical literature, most often in discussions of inflammatory responses, allergic reactions, and drug mechanisms, making it a useful term for students of medicine and biology.
nounA substance, such as histamine or serotonin, that is produced naturally within the body and acts as a local hormone or regulatory agent, influencing physiological processes near its site of release rather than acting at a distant target.
- Any of various substances produced within the body that act locally as hormones or regulators of physiological activity, including histamine, serotonin, prostaglandins, and related compounds.
- (In older usage) A substance secreted by one organ that influences the function of another organ within the same organism.
"Histamine, released during an allergic reaction, is one of the best-known autacoids."
"Prostaglandins are autacoids that mediate inflammation and pain in damaged tissue."
"Because autacoids act close to where they are released, they differ from classical hormones that travel through the bloodstream to distant targets."
The plural is standard when referring collectively to multiple such substances or to the class as a whole.
"Autacoids such as histamine and bradykinin play central roles in the inflammatory response."
Your body brews its own medicine cabinet — histamine, serotonin, and prostaglandins are all 'autacoids', self-made remedies named from the Greek for 'self-remedy'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of autacoid
The word "autacoid" was coined in the early twentieth century from Greek roots: "autos" meaning 'self' and "akos" meaning 'remedy' or 'cure'. It entered English through scientific writing on internal secretions, replacing the earlier spelling "autocoid". The prefix "auto-", shared with words like "autonomous" and "autograph", signals that these remedies originate within the organism itself.
How autacoid is actually used
The term belongs primarily to medical, pharmacological, and physiological registers and is uncommon in everyday speech. It is typically used in the plural when discussing classes of such substances. The older variant spelling "autocoid" appears in earlier twentieth-century literature but has largely fallen out of use.
Easily confused with autacoid
"Autocoid" is simply an older variant spelling of the same word, now largely superseded by "autacoid".
"Autoimmune" describes an immune response against the body's own tissues, whereas an autacoid is a normally occurring local signaling substance.