title: Myelin Sheath Development in the Maxillary Nerve of the Newborn Pig.
abstract: Myelination, the ensheathing of neuronal axons by myelin, is important for the proper function of both central and peripheral nervous systems. Various studies have investigated the quantitative parameters of myelination in certain species. Pigs are among the species of which their use as laboratory animals in neuroscience research increased the past few decades. However, there is limited data regarding the myelination process in the pig. Moreover, the maxillary nerve is crucial for Pseudorabies Virus (PrV) neuropathogenesis. In this context, a quantitative analysis of various myelination parameters of the maxillary nerve was performed, during the first 5 weeks of porcine post-natal development, the time period, which exhibits the highest interest for PrV neuropathogenesis. The evaluation was conducted in four groups of uninfected pigs, at the time of birth (group 0w), at the age of 1 week (group 1w), 3 weeks (group 3w) and 5 weeks (group 5w), using toluidine blue staining, immunofluorescence and electron microscopy. Axon and fibre diameter, perimeter and surface, myelin sheath thickness and g-ratio were measured on histological sections transverse to the longitudinal axis of the maxillary nerve. The thickness of myelin sheath was 0.76 μm for group 0w, 0.94 μm for group 1w, 0.98 μm for group 3w and 1.03 μm for group 5w. The g-ratio was 0.529, 0.540, 0.542 and 0.531 for the respective animal groups. The results of this study contribute to the understanding of the myelination process in the pig will be used for the study of PrV effects on the myelination development of newborn piglets' maxillary nerve and may shed new light to their vulnerability to the virus.
authors.affiliation: Department of Microbiology and Infectious Diseases, School of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: K V
authors.initials: KV
authors.lastname: Papageorgiou
authors.affiliation: Laboratory of Anatomy Histology, and Embryology, School of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: I
authors.initials: I
authors.lastname: Grivas
authors.affiliation: Laboratory of Anatomy Histology, and Embryology, School of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: M
authors.initials: M
authors.lastname: Chiotelli
authors.affiliation: Department of Botany, School of Biology, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: E
authors.initials: E
authors.lastname: Panteris
authors.affiliation: Department of Pathology, Faculty of Veterinary Medicine, School of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: N
authors.initials: N
authors.lastname: Papaioannou
authors.affiliation: Laboratory of Virology, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium.
authors.forename: H
authors.initials: H
authors.lastname: Nauwynck
authors.affiliation: Department of Microbiology and Infectious Diseases, School of Health Sciences, Aristotle University of Thessaloniki, 54124, Greece.
authors.forename: S K
authors.initials: SK
authors.lastname: Kritas
mesh_terms: D000818:Animals; D001369:Axons / Q000502:physiology*; D005455:Fluorescent Antibody Technique / Q000662:veterinary; D011558:Herpesvirus 1, Suid / Q000472:pathogenicity; D008442:Maxillary Nerve / Q000033:anatomy & histology* / Q000502:physiology; D008854:Microscopy, Electron / Q000662:veterinary*; D009186:Myelin Sheath / Q000502:physiology*; D013552:Swine / Q000033:anatomy & histology* / Q000254:growth & development; D013553:Swine Diseases / Q000821:virology