title: Observations of crypt neuron-like cells in the olfactory epithelium of a cartilaginous fish.
abstract: A new receptor neuron (RN) type was recently described in bony fish olfactory epithelium (OE): the crypt receptor neuron. This name is due to its main feature: the presence, at the apical part, of a deep invagination into which cilia protrude. The presence of this receptor neuron type is well documented in different species of bony fishes but it has never been described in cartilaginous fishes. In this study we demonstrate that crypt neuron-like cells are present in the olfactory epithelium of the elasmobranch Scyliorhinus canicula (Linnaeus, 1758). Histological observations allowed us to detect the presence of a few egg-shaped cells, characterized by a crypt like zone; alpha-tubulin immunoreactivity suggested the presence of cilia in the same area; fluorocrome conjugated lectin bindings suggested a distinctive mucus composition inside the presumptive crypt. The possible presence of crypt neuron-like cells in chondrichthyes would represent an interesting common feature between bony and cartilaginous fishes.
authors.affiliation: LIBiOM, Dipartimento di Biologia, Università di Genova, Viale Benedetto XV 5, I-16132 Genova, Italy. sara.ferrando@unige.it
authors.forename: Sara
authors.initials: S
authors.lastname: Ferrando
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Bottaro
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Gallus
authors.forename: Laura
authors.initials: L
authors.lastname: Girosi
authors.forename: Marino
authors.initials: M
authors.lastname: Vacchi
authors.forename: Grazia
authors.initials: G
authors.lastname: Tagliafierro
mesh_terms: D000818:Animals; D004284:Dogfish / Q000033:anatomy & histology*; D005260:Female; D006651:Histocytochemistry; D008297:Male; D009474:Neurons / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D009831:Olfactory Mucosa / Q000166:cytology / Q000294:innervation* / Q000378:metabolism