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Am J Physiol Gastrointest Liver Physiol 278: G551-G556, 2000;
0193-1857/00 $5.00
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Vol. 278, Issue 4, G551-G556, April 2000

Physiological roles of endogenous nitric oxide in lymphatic pump activity of rat mesentery in vivo

Yuichi Shirasawa, Fumitaka Ikomi, and Toshio Ohhashi

First Department of Physiology, Shinshu University School of Medicine, Matsumoto 390-8621, Japan

Physiological roles of endogenous nitric oxide (NO) in the lymphatic pump activity of rat mesenteries in vivo were evaluated using an intravital video microscope system. Changes in the pumping frequency (F), the end diastolic diameter (EDD), and the end systolic diameter (ESD) of the mesenteric lymph microvessels were measured with the microscope system and then the pump flow index (PFI) was calculated. A 15-min superfusion of 30 µM Nomega -nitro-L-arginine methyl ester (L-NAME) in the mesenteries caused significant increases of F and PFI and a significant decrease of the EDD and ESD. Simultaneous superfusion of 1 mM L-arginine with 30 µM L-NAME produced a significant reversal of the L-NAME-mediated increase of F and decrease of ESD. A 15-min superfusion of 100 µM aminoguanidine caused no significant effects on F, EDD, and ESD of the mesenteric lymph vessels in vivo. These findings suggest that endogenous NO has physiologically modulated the lymphatic pump activity in rat mesentery in vivo and that the production and release of NO may be mediated by constitutive NO synthase but not by inducible NO synthase.

lymph pump activity; vital microscope


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