Interstitial ATP and norepinephrine concentrations in active muscle

Jianhua Li, Nicholas C. King, Lawrence Sinoway

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Background-Sympathetic nervous system activity increases with exercise in normal subjects. Heightened peripheral sympathetic nervous activity and the resultant increased neurovascular levels of norepinephrine (NE) evoke vasoconstriction and serve to maintain blood pressure and perfusion to vital organs. Previous work demonstrated that the interstitial ATP concentrations ([ATP]i) rise in contracting skeletal muscle, and it is known that sympathetic nerves have purinergic P2X receptors. Thus, in this report we tested the hypothesis that elevated ATP would stimulate these receptors and increase interstitial NE concentrations ([NE]I). Methods and Results-Muscle interstitial samples were collected from microdialysis probes inserted in the skeletal muscle of rats, and dialysate concentrations of ATP and NE were determined by the high-performance liquid chromatography method. Stretch (0.5 kg of tension) increased [ATP]i by 68% (P<0.05) and [NE]i by 45% (P<0.05) in active muscle. The rise in NEi was linearly linked to the elevated ATPi (r=0.878, P<.001). [NE]i was also elevated by 76% (P<0.05) after ATP (3 μmol/L) was injected into the arterial blood supply of the hindlimb muscles. The [NE]i response to muscle stretch was blunted after the P2X receptor antagonist pyridoxal phosphate-6-azophenyl-2′,4′-disulfonic acid (PPADS) was given. Finally, this response was potentiated by the nucleotidase inhibitor 6-N,N-diethyl-β-γ-dibromomethylene-D-adenosine-5′-triphosphate (ARL67156). Conclusions-ATPi released by skeletal muscle during stretch stimulates P2X receptors on the sympathetic nerves and increases the concentration of NEi in the muscle interstitium.

Original languageEnglish (US)
Pages (from-to)2748-2751
Number of pages4
JournalCirculation
Volume111
Issue number21
DOIs
StatePublished - May 31 2005

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Norepinephrine
Adenosine Triphosphate
Muscles
Skeletal Muscle
nucleotidase
Purinergic P2X Receptors
Dialysis Solutions
Sympathetic Nervous System
Microdialysis
Hindlimb
Vasoconstriction
Perfusion
High Pressure Liquid Chromatography
Blood Pressure
Acids

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

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title = "Interstitial ATP and norepinephrine concentrations in active muscle",
abstract = "Background-Sympathetic nervous system activity increases with exercise in normal subjects. Heightened peripheral sympathetic nervous activity and the resultant increased neurovascular levels of norepinephrine (NE) evoke vasoconstriction and serve to maintain blood pressure and perfusion to vital organs. Previous work demonstrated that the interstitial ATP concentrations ([ATP]i) rise in contracting skeletal muscle, and it is known that sympathetic nerves have purinergic P2X receptors. Thus, in this report we tested the hypothesis that elevated ATP would stimulate these receptors and increase interstitial NE concentrations ([NE]I). Methods and Results-Muscle interstitial samples were collected from microdialysis probes inserted in the skeletal muscle of rats, and dialysate concentrations of ATP and NE were determined by the high-performance liquid chromatography method. Stretch (0.5 kg of tension) increased [ATP]i by 68{\%} (P<0.05) and [NE]i by 45{\%} (P<0.05) in active muscle. The rise in NEi was linearly linked to the elevated ATPi (r=0.878, P<.001). [NE]i was also elevated by 76{\%} (P<0.05) after ATP (3 μmol/L) was injected into the arterial blood supply of the hindlimb muscles. The [NE]i response to muscle stretch was blunted after the P2X receptor antagonist pyridoxal phosphate-6-azophenyl-2′,4′-disulfonic acid (PPADS) was given. Finally, this response was potentiated by the nucleotidase inhibitor 6-N,N-diethyl-β-γ-dibromomethylene-D-adenosine-5′-triphosphate (ARL67156). Conclusions-ATPi released by skeletal muscle during stretch stimulates P2X receptors on the sympathetic nerves and increases the concentration of NEi in the muscle interstitium.",
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Interstitial ATP and norepinephrine concentrations in active muscle. / Li, Jianhua; King, Nicholas C.; Sinoway, Lawrence.

In: Circulation, Vol. 111, No. 21, 31.05.2005, p. 2748-2751.

Research output: Contribution to journalArticle

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AU - Li, Jianhua

AU - King, Nicholas C.

AU - Sinoway, Lawrence

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AB - Background-Sympathetic nervous system activity increases with exercise in normal subjects. Heightened peripheral sympathetic nervous activity and the resultant increased neurovascular levels of norepinephrine (NE) evoke vasoconstriction and serve to maintain blood pressure and perfusion to vital organs. Previous work demonstrated that the interstitial ATP concentrations ([ATP]i) rise in contracting skeletal muscle, and it is known that sympathetic nerves have purinergic P2X receptors. Thus, in this report we tested the hypothesis that elevated ATP would stimulate these receptors and increase interstitial NE concentrations ([NE]I). Methods and Results-Muscle interstitial samples were collected from microdialysis probes inserted in the skeletal muscle of rats, and dialysate concentrations of ATP and NE were determined by the high-performance liquid chromatography method. Stretch (0.5 kg of tension) increased [ATP]i by 68% (P<0.05) and [NE]i by 45% (P<0.05) in active muscle. The rise in NEi was linearly linked to the elevated ATPi (r=0.878, P<.001). [NE]i was also elevated by 76% (P<0.05) after ATP (3 μmol/L) was injected into the arterial blood supply of the hindlimb muscles. The [NE]i response to muscle stretch was blunted after the P2X receptor antagonist pyridoxal phosphate-6-azophenyl-2′,4′-disulfonic acid (PPADS) was given. Finally, this response was potentiated by the nucleotidase inhibitor 6-N,N-diethyl-β-γ-dibromomethylene-D-adenosine-5′-triphosphate (ARL67156). Conclusions-ATPi released by skeletal muscle during stretch stimulates P2X receptors on the sympathetic nerves and increases the concentration of NEi in the muscle interstitium.

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