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-Methylene ATP elicits a reflex pressor response
arising from muscle in decerebrate cats
Division of Cardiovascular Medicine, Departments of Internal Medicine and Human Physiology, University of California, Davis, California 95616
In part, the exercise pressor
reflex is believed to be evoked by chemical stimuli signaling that
blood supply to exercising muscles is not adequate to meet its
metabolic demands. There is evidence that either ATP or
adenosine may function as one of these chemical stimuli. For example,
muscle interstitial concentrations of both substances have been found
to increase during exercise. This finding led us to test the hypothesis
that popliteal arterial injection of
,
-methylene ATP (5, 20, and
50 µg/kg), which stimulates P2X receptors, and 2-chloroadenosine (25 µg/kg), which stimulates P1 receptors, evokes reflex pressor
responses in decerebrate, unanesthetized cats. We found that popliteal
arterial injection of the two highest doses of
,
-methylene ATP
evoked pressor responses, whereas popliteal arterial injection of
2-chloroadenosine did not. In addition, the pressor responses evoked by
,
-methylene ATP were blocked either by section of the sciatic
nerve or by prior popliteal arterial injection of pyridoxal
phosphate-6-azophenyl-2',4'-disulfonic acid (10 mg/kg), a selective
P2-receptor antagonist. We conclude that the stimulation of P2
receptors, which are accessible through the vascular supply of skeletal
muscle, evokes reflex pressor responses. In addition, our findings are
consistent with the hypothesis that the stimulation of P2 receptors
comprises part of the metabolic error signal evoking the exercise
pressor reflex.
purines; exercise; autonomic nervous system; thin fiber muscle afferents; metabolic error signal
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