What does autocrine mean?
Autocrine describes one of the principal modes of cellular communication in biology. In an autocrine mechanism, a cell releases a chemical messenger — typically a hormone, cytokine, or growth factor — which then binds to receptors on the surface of that same cell, influencing its own behavior. The word contrasts with paracrine signaling, in which the messenger acts on immediately neighboring cells, and endocrine signaling, in which hormones travel through the bloodstream to reach distant targets. Autocrine regulation plays a normal role in processes such as immune responses and tissue development, but it also has important medical significance: many cancer cells establish self-reinforcing autocrine loops that drive their own uncontrolled growth, making the term common in oncology research. Derived from Greek roots meaning 'self' and 'separate,' it is a precise, technical adjective found almost entirely in scientific writing.
adjectiveOf or relating to a form of cell signaling in which a cell secretes a substance, such as a hormone or growth factor, that binds to receptors on the same cell and affects its own activity.
- (of cell signaling) Describing a mechanism by which a cell responds to substances it has secreted itself, acting on receptors on its own surface.
"The tumor cells showed autocrine stimulation, producing growth factors that fueled their own proliferation."
"Interleukin-2 can act in an autocrine manner, activating the T cells that produced it."
"Many cancers depend on an autocrine loop in which the tumor both secretes a growth factor and carries receptors for it."
Some cells literally talk to themselves — biologists call this 'autocrine' signaling, and cancer cells often exploit it to keep telling themselves to grow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of autocrine
The word autocrine was coined in the twentieth century from Greek roots: 'autos,' meaning self, and 'krinein,' meaning to separate or secrete, the same root seen in 'endocrine' and 'exocrine.' It was introduced into scientific literature in the late 1970s and early 1980s, when researchers studying growth factors recognized that some cells stimulate themselves through their own secretions. Its sibling terms paracrine and endocrine share the '-crine' element, reflecting the shared concept of hormonal secretion.
How autocrine is actually used
A technical term used almost exclusively in biology, medicine, and biochemistry; it is rarely encountered in general conversation. It is nearly always attributive, modifying nouns such as signaling, loop, pathway, or stimulation rather than standing alone as a predicate.
Easily confused with autocrine
Paracrine signaling acts on nearby neighboring cells, whereas autocrine signaling acts on the very cell that released the signal.
Endocrine signaling involves hormones carried through the bloodstream to distant target organs, while autocrine signals act on the same cell that secreted them.