Cholecystokinin (CCK) is an amino acid peptide. It has been isolated from porcine duodenum. CCK is known to regulate like anxiety, schizophrenia and depression by acting on CCKB receptor. CCK-A receptors are localized in the pancreas, gallbladder, pylorus, intestine and the vagus nerve. CCK is administered peripherally and it inhibits food consumption in humans and other many other species. CCK-A receptor antagonists suspend satiety
