title: Modification of tenascin-R expression following unilateral labyrinthectomy in rats indicates its possible role in neural plasticity of the vestibular neural circuit.
abstract: We have previously found that unilateral labyrinthectomy is accompanied by modification of hyaluronan and chondroitin sulfate proteoglycan staining in the lateral vestibular nucleus of rats and the time course of subsequent reorganization of extracellular matrix assembly correlates to the restoration of impaired vestibular function. The tenascin-R has repelling effect on pathfinding during axonal growth/regrowth, and thus inhibits neural circuit repair. By using immunohistochemical method, we studied the modification of tenascin-R expression in the superior, medial, lateral, and descending vestibular nuclei of the rat following unilateral labyrinthectomy. On postoperative day 1, tenascin-R reaction in the perineuronal nets disappeared on the side of labyrinthectomy in the superior, lateral, medial, and rostral part of the descending vestibular nuclei. On survival day 3, the staining intensity of tenascin-R reaction in perineuronal nets recovered on the operated side of the medial vestibular nucleus, whereas it was restored by the time of postoperative day 7 in the superior, lateral and rostral part of the descending vestibular nuclei. The staining intensity of tenascin-R reaction remained unchanged in the caudal part of the descending vestibular nucleus bilaterally. Regional differences in the modification of tenascin-R expression presented here may be associated with different roles of individual vestibular nuclei in the compensatory processes. The decreased expression of the tenascin-R may suggest the extracellular facilitation of plastic modifications in the vestibular neural circuit after lesion of the labyrinthine receptors.
authors.affiliation: Department of Anatomy, Histology and Embryology, Faculty of Medicine and Faculty of Dentistry, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Botond
authors.initials: B
authors.lastname: Gaal
authors.affiliation: Department of Anatomy, Histology and Embryology, Faculty of Medicine and Faculty of Dentistry, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Einar Örn
authors.initials: EÖ
authors.lastname: Jóhannesson
authors.affiliation: Department of Anatomy, Histology and Embryology, Faculty of Medicine and Faculty of Dentistry, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Amit
authors.initials: A
authors.lastname: Dattani
authors.affiliation: Department of Pediatric Surgery, Faculty of Medicine, Clinical Center, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Agnes
authors.initials: A
authors.lastname: Magyar
authors.affiliation: Department of Anatomy, Histology and Embryology, Faculty of Medicine and Faculty of Dentistry, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Ildikó
authors.initials: I
authors.lastname: Wéber
authors.affiliation: Department of Anatomy, Histology and Embryology, Faculty of Medicine and Faculty of Dentistry, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary ; MTA-DE Neuroscience Research Group, University of Debrecen, Nagyerdei krt. 98, Debrecen, Hungary.
authors.forename: Clara
authors.identifier: 0000-0002-3091-0756
authors.initials: C
authors.lastname: Matesz
keywords: brainstem; extracellular matrix; nerve regeneration; neural plasticity; neural regeneration; perineuronal net; vestibular compensation; vestibular lesion; vestibular system