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- W804290791 abstract "We use opossums Monodelphis domestica as a model to study the development of mammalian motor systems. The forelimbs of newbom opossums perform rhythmic and altemate movements that are likely of spinal control, and the hindlimbs only start moving in the second week. In view of the scarcity of chemical synapses demonstrated in the spinal enlargements of neonatal opossums, we hypothesize that electrical synapses (gap junctions) could mediate the neuronal communication responsible for the first limb movements. We have investigated by immunohistochemistry the presence of the neuronal gap junction protein Connexin36 (Cx36) in the spinal cord enlargements of postnatal opossums. At birth, Cx36 immunoreactivity is moderate in the presumptive gray matter in both enlargements. Thereafter, Cx36 expression gradually decreases in the ventral hom, but increases dorsally up to a high level between PlO and P20 in both enlargements. In the ventral hom, Cx36 puncta are located near ventral intemeurons or on dendrites of motoneurons rather than on their somas. Immunoreactivity for Cx36 is barely detectable in the dorsal hom by P30. Cx36 immunoreactivity is detected in the presumptive white matter at birth, but decreases thereafter, except for the dorsal part of the lateral funiculi where it is very high between' PlO and P20, before it vanishes by P30. The presence of the neuronal gap junction protein Cx36 in the spinal enlargements of neonatal opossums suggests the existence of electrical synapses, which could control the early limb movements. Its postnatal decrease parallels the increase in chemical synapses in the spinal cord and the maturation of locomotion." @default.
- W804290791 created "2016-06-24" @default.
- W804290791 creator A5024006057 @default.
- W804290791 date "2009-04-16" @default.
- W804290791 modified "2023-09-24" @default.
- W804290791 title "Expression de la connexine 36 dans la moelle épinière au cours du développement postnatal de l'opossum Monodelphis domestica" @default.
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