second messenger

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sec·ond mes·sen·ger

an intermediary molecule that is generated as a consequence of hormone-receptor interaction, for example, see adenosine 3',5'-cyclic monophosphate, guanosine 3',5'-cyclic monophosphate, calcium, inositide.

second messenger

a chemical substance inside a cell that carries information farther along the signal pathway from the internal part of a membrane-spanning receptor embedded in the cell membrane. It may be in the form of an enzyme's product or ion fluxes. Ca2+, nitric oxide, and cAMP are common examples.
References in periodicals archive ?
Both second messenger systems interact downstream with effector substances that help to bring about the observed effects.
An initial neurotransmitter will activate the fast ion channel receptor, while a second or third neurotransmitter will activate the second messenger system that modifies the effect of the initial transmitter.
It is the second messenger system that can modify the postsynaptic potential of the neurotransmitter, enhancing the potential of the response, inhibiting further release of the NT or terminating the postsynaptic response.
or 'Nanotechnology', the majority offer straightforward clear synopses of areas of basic physiology and pharmacology such as acid-base balance, temperature regulation, receptors and second messenger systems.