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Synaptic organization of damaged infraorbital nerve axons in perinatal rats: demonstration by galanin immunocytochemistry

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Abstract

Neonatal transection of the infraorbital nerve (ION; the trigeminal, V, branch that supplies the mystacial vibrissae follicles) results in an upregulation of galanin in the central arbors of primary afferent axons. The present study was undertaken to evaluate the synaptic organization of these galanin-positive primary afferents and compare it with that of normal neurobiotin/biocytin-labeled primary afferent axons from animals of the same age. Examination of 1200 neurobiotin/biocytin-labeled profiles in V nucleus principalis (PrV) of rats killed on postnatal day (P-) 7 indicated that 23.3% (n=279) of these profiles made synaptic contacts: 87.4% were axodendritic, 8.9% were axoaxonic, 2.8% were axosomatic, and 0.7% were axospinous. Evaluation of 1200 galanin-positive profiles in PrV from rats that sustained transection of the ION on P-0 and were killed on P-7 indicated that only 64 (5.3%) of these profiles made synaptic contacts (P<0.05 compared with the intact animals). Of the galanin-positive profiles that did make synapses in PrV, 81.2% (n=52) were axodendritic and 18.8% (n=12) were axoaxonic. These results indicate that galanin released by damaged ION primary afferents in PrV is likely to affect the activity of second-order V neurons by a paracrine action rather than by acting at specific synapses.

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Authors and Affiliations

  1. Department of Anatomy and Neurobiology, Medical College of Ohio, P.O. Box 10008, 43699, Toledo, OH, USA

    Robert S. Crissman, Li Zheng, Nicolas L. Chiaia & Robert W. Rhoades

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  1. Robert S. Crissman
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  2. Li Zheng
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  3. Nicolas L. Chiaia
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  4. Robert W. Rhoades
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Crissman, R.S., Zheng, L., Chiaia, N.L. et al. Synaptic organization of damaged infraorbital nerve axons in perinatal rats: demonstration by galanin immunocytochemistry. Exp Brain Res 110, 47–54 (1996). https://doi.org/10.1007/BF00241373

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  • DOI: https://doi.org/10.1007/BF00241373

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