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Regional differences in sympathetic purinergic transmission along the length of the mouse vas deferens
Author(s) -
Knight D.,
D'Arbe M.,
Liang S.,
Phillips W.D.,
Lavidis N.A.
Publication year - 2002
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/syn.10119
Subject(s) - vas deferens , purinergic receptor , neurotransmission , contraction (grammar) , medicine , endocrinology , excitatory postsynaptic potential , muscle contraction , chemistry , biology , anatomy , receptor , adenosine
Abstract Contraction of the smooth muscle in the mouse vas deferens is elicited by sympathetic nerves releasing at least two neurotransmitters, adenosine triphosphate (ATP) and noradrenaline (NA). Several studies have indicated the presence of regional variation in the purinergic and noradrenergic contributions to sympathetic nerve‐evoked contractions in rodent vasa deferentia. We examined the relative contribution of ATP and NA to neurotransmission and contraction at the prostatic and epididymal ends of the mouse vas deferens. The success rate of recording excitatory junction currents (EJCs, extracellular indication of ATP release) from varicosities at the prostatic end of the vas deferens was eight times greater than for varicosities located at the epididymal end. Both regions of the vas deferens responded similarly to focal application of NA and ATP. Furthermore, the relative density and distribution of P2X 1 ‐receptor mRNA and anti‐P2X 1 immunostaining did not differ between the two regions. Our results suggest that most varicosities located at the epididymal end of the vas deferens are releasing an insufficient amount of ATP to evoke detectable EJCs. Synapse 47:225–235, 2003. © 2002 Wiley‐Liss, Inc.