- Any process which helps to produce biological responses to events in the environment or internal milieu; e.g., transduction of light into nerve impulses by the retina, or transduction of hormone binding into cellular events by hormone receptors.
Definition from: CRISP Thesaurus via Unified Medical Language System at the National Library of Medicine
- The intercellular or intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the gamma-aminobutyric acid-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
Related discussion in the Handbook
See also Understanding Medical Terminology.