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• W2024951863 abstract "The preceding study (Dietrich and Tyml, 1992. Microvasc. Res. 43) demonstrated that a local application of norepinephrine (NE) on a capillary in a skeletal muscle produces a temporary reduction in blood flow within this capillary. The reduction is mediated via constriction of the supplying arteriole. The objective of the present study was to address the mechanism by which the local NE stimulus is propagated from the capillary to the arteriole. Using intravital video microscopy we measured red blood cell velocity in capillaries, and diameter of supplying arterioles, in the sartorius muscle in anesthetized frogs. Velocity responses were measured following iontophoretic application of NE (3 mM in the pipette) on the capillary, with or without pretreatment with 0.9 mM tetrodotoxin (nerve-specific sodium channel blocker), 30 mM lidocaine (nonspecific sodium channel blocker), and 30 mM yohimbine (alpha 2-receptor blocker). Diameter responses were measured before and after capillary damage introduced by microcautery. Tetrodotoxin did not block the NE-induced velocity reduction (i.e., from 0.2 to 0.07 mm/sec), while lidocaine attenuated it. Yohimbine blocked it only when applied on the same site as NE. Capillary damage abolished the NE-induced arteriolar constriction (i.e., from 27.8 to 21.5 microns). We conclude that the observed responses were not due to (1) direct diffusion of NE from the capillary to the arteriole, (2) conduction along adrenergic nerves, or (3) venous-arteriolar diffusional cross-talk. We interpret our data to indicate that the capillary itself could function as a communicating medium." @default.
• W2024951863 created "2016-06-24" @default.
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• W2024951863 date "1992-01-01" @default.
• W2024951863 modified "2023-09-25" @default.
• W2024951863 title "Capillary as a communicating medium in the microvasculature" @default.
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• W2024951863 doi "https://doi.org/10.1016/0026-2862(92)90008-d" @default.
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