What question did this study set out to answer?

To investigate the pharmacological responsiveness and vasoconstrictor characteristics of isolated and perfused canine splenic arteries exposed to vasoactive substances and periarterial electrical nerve stimulation.

January 1, 1994The Japanese Journal of PharmacologyOpen Access

Characteristics of the Responses of Isolated and Perfused Canine Splenic Arteries to Vasoactive Substances and to Periarterially Electrical Stimulation

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To investigate the pharmacological responsiveness and vasoconstrictor characteristics of isolated and perfused canine splenic arteries exposed to vasoactive substances and periarterial electrical nerve stimulation.
Mounted isolated canine splenic artery segments using the cannula insertion method to perfuse the vessels and evaluate changes in vascular tone.
Administered alpha-adrenoceptor agonists (noradrenaline, phenylephrine, clonidine, methoxamine, xylazine), autacoids (5-HT, ATP, histamine), KCl, and selective antagonists (bunazosin and midaglizole).
Delivered periarterial electrical stimulation across varying parameters (6–12 V, 0.1–10 Hz, 0.2–1 msec pulse duration) before and after administering tetrodotoxin or guanethidine.
Alpha-adrenoceptor agonists produced dose-dependent vasoconstrictions with a potency ranking of noradrenaline > phenylephrine > clonidine > methoxamine > tyramine, whereas xylazine elicited no response.
Bunazosin (selective alpha-1 antagonist) shifted the dose-response curves for noradrenaline and clonidine to the right, whereas midaglizole (selective alpha-2 antagonist) produced no effect.
Electrical stimulation produced reliable vasoconstrictions that were completely abolished by tetrodotoxin and strongly attenuated by guanethidine.

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Implication

Experimental study reveals alpha-1 adrenoceptor-mediated vasoconstriction in isolated canine splenic arteries, indicating functional adrenergic responsiveness devoid of postsynaptic alpha-2 receptors.

Cite This Study

Ren et al. (1994) studied this question.

synapsesocial.com/papers/6a8ced8bb2231968f43058e6 https://doi.org/10.1254/jjp.64.19

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Characteristics of the Responses of Isolated and Perfused Canine Splenic Arteries to Vasoactive Substances and to Periarterially Electrical Stimulation

Key Points

Discussion

Implication

Cite This Study

Characteristics of the Responses of Isolated and Perfused Canine Splenic Arteries to Vasoactive Substances and to Periarterially Electrical Stimulation

Key Points

Discussion

Implication

Cite This Study

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