Second messengers are small molecules and ions that relay signals received by cell-surface receptors to effector proteins. ... These messengers then diffuse rapidly from the source and bind to target proteins to alter their properties (activity, localization, stability, etc.) to propagate signaling.
What do you mean by second messenger?
Second messengers are intracellular signaling molecules released by the cell in response to exposure to extracellular signaling molecules—the first messengers. ... Examples of second messenger molecules include cyclic AMP, cyclic GMP, inositol triphosphate, diacylglycerol, and calcium.
What is the second messenger in a second messenger system?
Second messengers are small intracellular molecules that mediate the effects of first messengers, i.e., neurotransmitters and hormones. Some of the important second messengers in the nervous system are cAMP, cyclic guanosine monophosphate (cGMP), diacylglycerol (DAG), inositol trisphosphate (IP3), and Ca2+ ions.
