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- W2073632393 abstract "Novel chemical and electrical connections form between neurons not normally connected in the buccal ganglia of the snail Helisoma. We examined the cellular and environmental conditions required for the formation of each type of connection. Previous work in situ showed that novel electrical connections could form in response to axotomy. We have now found that axotomy can evoke the formation of novel unidirectional chemical connections between neurons B5 and B4 in addition to a novel electrical connection. The novel chemical connections display all of the normal properties of chemical synapses in Helisoma ganglia. These connections, however, are transient in nature and break 4 days following axotomy. Previous work has shown that conjoint outgrowth is required for the formation of electrical connections. In cell culture we have investigated whether conjoint outgrowth is also required for chemical synaptogenesis. Using neurons B5 and B19 we have found that when neuron pairs make contact in cell culture, under conditions of synchronous neurite extension, both electrical and chemical synapses form. However, if one neuron has ceased extension prior to contact by a growing neuron, electrical synapses never form (Hadley et al., 1983, 1985) but chemical synapses do form. Furthermore, the addition of serotonin (10(-6) M) to culture medium to inhibit neurite extension of B19, but not that of B5, selectively prevents the formation of electrical connections while permitting the formation of chemical synapses. Thus, the timing of contact in relation to the state of neurite extension can specify the type of connection a given neuron can form." @default.
- W2073632393 created "2016-06-24" @default.
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- W2073632393 date "1988-10-01" @default.
- W2073632393 modified "2023-10-17" @default.
- W2073632393 title "The differential regulation of formation of chemical and electrical connections inHelisoma" @default.
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- W2073632393 doi "https://doi.org/10.1002/neu.480190706" @default.
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