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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9974

Title: Identification of the components of excitatory junction potentials in the guinea pig vas deferens
Authors: MANCHANDA, R
VENKATESWARLU, K
Keywords: rat tail artery
smooth-muscle
individual varicosities
adenosine-triphosphate
ear artery
atp
noradrenaline
transmitter
cells
secretion
Issue Date: 1997
Publisher: MARCEL DEKKER INC
Citation: ELECTRO- AND MAGNETOBIOLOGY, 16(3), 215-233
Abstract: The contributions to the generation of excitatory junction potentials (EJPs) during neurotransmission in a smooth muscle organ have been investigated. The effects of nerve stimulation intensity on ETPs with complex time courses have been explored in the guinea pig vas deferens. It is shown that complex EJPs are resolvable into intermediate rapid and slow components, produced by the activity of separately recruitable innervating axons. The effects of the putative gap junctional uncoupling agent heptanol on EJPs have also been studied. Heptanol abolished the EJP reversibly. However, brief stimulus-locked depolarizations continued to occur intermittently at the same latency as the EJP even while the EJP was completely suppressed. These depolarizations had properties very similar to those of SEJPs, and reflect the fundamental quantal depolarizations underlying the EJP. They are termed quantal EJPs (QEJPs). Our results show that there are two principal contributions to the generation of the EJP, namely (i) QEJPs produced by the activity of individual varicosities; (ii) the intermediate components produced by the recruitment of axons and simultaneous activation of several varicosities. These events sum together to generate the EJP of the vas deferens.
URI: http://dx.doi.org/10.3109/15368379709015654
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9974
http://hdl.handle.net/10054/9974
ISSN: 1061-9526
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