Blockade of acid sensing ion channels attenuates the augmented exercise pressor reflex in rats with chronic femoral artery occlusion

Hirotsugu Tsuchimochi, Katsuya Yamauchi, Jennifer L. Mccord, Marc P Kaufman

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We found previously that static contraction of the hindlimb muscles of rats whose femoral artery was ligated evoked a larger reflex pressor response (i.e. exercise pressor reflex) than did static contraction of the contralateral hindlimb muscles which were freely perfused. Ligating a femoral artery in rats results in blood flow patterns to the muscles that are remarkably similar to those displayed by humans with peripheral artery disease. Using decerebrated rats, we tested the hypothesis that the augmented exercise pressor reflex in rats with a ligated femoral artery is attenuated by blockade of the acid sensing ion channel (ASIC) 3. We found that femoral arterial injection of either amiloride (5 and 50 μg kg -1) or APETx2 (100 μg kg -1) markedly attenuated the reflex in rats with a ligated femoral artery. In contrast, these ASIC antagonists had only modest effects on the reflex in rats with freely perfused hindlimbs. Tests of specificity of the two antagonists revealed that the low dose of amiloride and APETx2 greatly attenuated the pressor response to lactic acid, an ASIC agonist, but did not attenuate the pressor response to capsaicin, a TRPV1 agonist. In contrast, the high dose of amiloride attenuated the pressor responses to lactic acid, but also attenuated the pressor response to capsaicin. We conclude that ASIC3 on thin fibre muscle afferents plays an important role in evoking the exercise pressor reflex in rats with a compromised arterial blood supply to the working muscles.

Original languageEnglish (US)
Pages (from-to)6173-6189
Number of pages17
JournalJournal of Physiology
Volume589
Issue number24
DOIs
StatePublished - Dec 2011
Externally publishedYes

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Acid Sensing Ion Channels
Femoral Artery
Reflex
Amiloride
Hindlimb
Muscles
Capsaicin
Lactic Acid
Peripheral Arterial Disease
Muscle Contraction
Thigh
Injections

ASJC Scopus subject areas

  • Physiology

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Blockade of acid sensing ion channels attenuates the augmented exercise pressor reflex in rats with chronic femoral artery occlusion. / Tsuchimochi, Hirotsugu; Yamauchi, Katsuya; Mccord, Jennifer L.; Kaufman, Marc P.

In: Journal of Physiology, Vol. 589, No. 24, 12.2011, p. 6173-6189.

Research output: Contribution to journalArticle

Tsuchimochi, Hirotsugu ; Yamauchi, Katsuya ; Mccord, Jennifer L. ; Kaufman, Marc P. / Blockade of acid sensing ion channels attenuates the augmented exercise pressor reflex in rats with chronic femoral artery occlusion. In: Journal of Physiology. 2011 ; Vol. 589, No. 24. pp. 6173-6189.
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