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Division of Cardiovascular Medicine, Departments of Internal Medicine and Human Physiology, University of California, Davis, California 95616
Submitted 22 September 2003 ; accepted in final form 29 October 2003
ABSTRACT
The responses of group III and IV triceps surae muscle afferents to intra-arterial injection of
,
-methylene ATP (50 µg/kg) was examined in decerebrate cats. We found that this P2X3 agonist stimulated only three of 18 group III afferents but 7 of 9 group IV afferents (P < 0.004). The three group III afferents stimulated by
,
-methylene ATP conducted impulses below 4 m/s. Pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid, a P2-receptor antagonist, prevented the stimulation of these afferents by
,
-methylene ATP. We conclude that P2X3 agonists stimulate only the slowest conducting group III muscle afferents as well as group IV afferents.
adenosine 5'-triphosphate; purines; group III afferents; group IV afferents; metaboreflex; pressor response
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