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Ultrastructural Analysis of the Synaptic Connectivity of TRPV1-Expressing Primary Afferent Terminals in the Rat Trigeminal Caudal Nucleus
- Ultrastructural Analysis of the Synaptic Connectivity of TRPV1-Expressing Primary Afferent Terminals in the Rat Trigeminal Caudal Nucleus
- Yeo, EJ[Yeo, Eun Jin]; Cho, YS[Cho, Yi Sul]; Paik, SK[Paik, Sang Kyoo]; Yoshida, A[Yoshida, Atsushi]; Park, MJ[Park, Mae Ja]; Ahn, DK[Ahn, Dong Kuk]; Moon, C[Moon, Cheil]; Kim, YS[Kim, Yun Sook]; Bae, YC[Bae, Yong Chul]
- DGIST Authors
- Moon, C[Moon, Cheil]
- Issue Date
- Journal of Comparative Neurology, 518(20), 4134-4146
- Article Type
- 4 Aminobutyric Acid; Animal Tissue; Animals; Antibody Labeling; Cell Ultrastructure; Cell Vacuole; Dendrite; Dendritic Spine; Electron Microscopy; Enkephalin; Gamma-Aminobutyric Acid; Glutamate Decarboxylase; Glutamate Decarboxylase 65; Glutamate Decarboxylase 67; Immunohistochemistry; Male; Microscopy, Immunoelectron; Myelinated Nerve; Nerve Fiber; Neurons, Afferent; Nociception; Non-Human; Non-Myelinated Nerve; Presynaptic Nerve; Presynaptic Terminals; Priority Journal; Protein Expression; Rat; Rats; Rats, Sprague-Dawley; Synapse; Synapses; Synaptic Membrane; Trigeminal; Trigeminal Caudal Nucleus; Trigeminal Nerve; Trigeminal Nucleus; TRPV Cation Channels; TRPV1; Vanilloid Receptor1
- Trigeminal primary afferents that express the transient receptor potential vanilloid 1 (TRPV1) are important for the transmission of orofacial nociception. However, little is known about how the TRPV1-mediated nociceptive information is processed at the first relay nucleus in the central nervous system (CNS). To address this issue, we studied the synaptic connectivity of TRPV1-positive (+) terminals in the rat trigeminal caudal nucleus (Vc) by using electron microscopic immunohistochemistry and analysis of serial thin sections. Whereas the large majority of TRPV1+ terminals made synaptic contacts of an asymmetric type with one or two postsynaptic dendrites, a considerable fraction also participated in complex glomerular synaptic arrangements. A few TRPV1+ terminals received axoaxonic contacts from synaptic endings that contained pleomorphic synaptic vesicles and were immunolabeled for glutamic acid decarboxylase, the synthesizing enzyme for the inhibitory neurotransmitter c-aminobutyric acid (GABA). We classified the TRPV1+ terminals into an S-type, containing less than five dense-core vesicles (DCVs), and a DCV-type, containing five or more DCVs. The number of postsynaptic dendrites was similar between the two types of terminals; however, whereas axoaxonic contacts were frequent on the S-type, the DCV-type did not receive axoaxonic contacts. In the sensory root of the trigeminal ganglion, TRPV1+ axons were mostly unmyelinated, and a small fraction was small myelinated. These results suggest that the TRPV1-mediated nociceptive information from the orofacial region is processed in a specific manner by two distinct types of synaptic arrangements in the Vc, and that the central input of a few TRPV1+ afferents is presynaptically modulated via a GABA-mediated mechanism. © 2010 Wiley-Liss, Inc.
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