Receptor Physiological ligands Second messenger General physiological effectDistributionIP Iloprosta > E1 = E2 ↑ cAMP ‘Inhibitory’: e.g. smooth muscle relaxationAbundant in cardiovascular system, platelets and neurons DP D2 Least abundant prostanoid receptor; restricted distribution (e.g. vascular smooth muscle and cutaneous blood vessels) EP2 E1 = E2 Least abundant EP receptor; induced in response to stimuli EP4 E1 = E2 Widespread distribution throughout body TP TxA2 > D2 ↑ Ca2+ ‘Excitatory’: e.g. smooth muscle contraction Abundant in cardiovascular system, platelets and immune cells Two subtypes known, opposing actions FP F2α > D2 Very high expression in female reproductive organs EP1 E2 > E1 > F2α Mainly kidney, lung and stomach EP3 E1 = E2 > iloprost ↓ cAMP ‘Inhibitory’: inhibits smooth muscle relaxation Widespread distribution throughout body
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