Multiple secondary messengers

Multiple secondary messengers" refers to a heterogeneous group of small intracellular molecules—including cyclic AMP, cyclic GMP, inositol triphosphate, diacylglycerol, calcium ions, and certain gases—that relay and amplify signals from activated cell surface receptors to downstream effectors within the cell, implementing diverse biological functions such as proliferation, differentiation, metabolism, and apoptosis. They are not themselves considered direct therapeutic targets, but are essential components of cellular signaling cascades and common downstream nodes affected by drugs targeting receptors, enzymes, or ion channels.

Other names

secondary messengerssecond messengersintracellular messengers

Not applicable (second messengers themselves are not primary drug targets; typical mechanisms involve modulation of their *synthesis* or *degradation*, e.g., phosphodiesterase inhibitors increase cAMP/cGMP by preventing their breakdown)