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However, little is known regarding the pathways involved in renal lymphatic vessel function, and there are no studies on the effects of drugs targeting impaired interstitial clearance, such as diuretics. Using pressure myography, we showed that renal lymphatic collecting vessels are sensitive to changes in transmural pressure and have an optimal range of effective pumping. In addition, they are responsive to vasoactive factors known to regulate tone in other lymphatic vessels including prostaglandin E<jats:sub>2<\/jats:sub>and nitric oxide, and their spontaneous contractility requires Ca<jats:sup>2+<\/jats:sup>and Cl<jats:sup>\u2212<\/jats:sup>. We also demonstrated that Na<jats:sup>+<\/jats:sup>-K<jats:sup>+<\/jats:sup>-2Cl<jats:sup>\u2212<\/jats:sup>cotransporter Nkcc1, but not Nkcc2, is expressed in extrarenal lymphatic vessels. Furosemide, a loop diuretic that inhibits Na<jats:sup>+<\/jats:sup>-K<jats:sup>+<\/jats:sup>-2Cl<jats:sup>\u2212<\/jats:sup>cotransporters, induced a dose-dependent dilation in lymphatic vessels and decreased the magnitude and frequency of spontaneous contractions, thereby reducing the ability of these vessels to propel lymph. Ethacrynic acid, another loop diuretic, had no effect on vessel tone. 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