https://www.selleckchem.com/pharmacological_epigenetics.html What is the central question of this study? Arachidonic acid (AA) stimulates NO production in antral mucous cells without any increase in [Ca ] . Given that the intracellular AA concentration is too low to measure, the relationship between AA accumulation and NO production remains uncertain. Is AA accumulation a key step for NO production? What is the main finding and its importance? We demonstrated that AA accumulation is a key step for NO production. The amount of AA released could be measured using fluorescence-HPLC. The intracellular AA concentration was maintained at <1μM. Nitric oxide is produced by AA accumulation in antral mucous cells, not as a direct effect of [Ca ] . In the present study, we demonstrate that NO production is stimulated by an accumulation of arachidonic acid (AA) mediated via peroxisome proliferation-activated receptorα (PPARα) and that the NO produced enhances Ca -regulated exocytosis in ACh-stimulated antral mucous cells. The amount of AA released from the antral omethacin enhanced Ca2+ -regulated exocytosis by increasing NO via PPARα, and the enhancement was abolished by GW6471 and cPLA2-inhα. Thus, AA produced via PLA2 activation is the key step for NO synthesis in ACh-stimulated antral mucous cells and plays important roles in maintaining antral mucous secretion, especially in Ca2+ -regulated exocytosis. What is the central question of this study? This is the first study to assess the day-to-day reliability of passive leg movement-induced hyperaemia (PLM-H), an index of lower-limb microvascular function, in young, healthy women. What is the main finding and its importance? Passive leg movement-induced hyperaemia demonstrated good day-to-day reliability, comparable to other common indices of endothelial function, supporting the use of PLM-H to assess lower-limb microvascular function in women. Passive leg movement-elicited hyperaemia (PLM-H) provides an index of lower-limb mi