title: Sex hormone binding globulin in the rat olfactory system.
abstract: Ovarian steroids are known to act on the olfactory system. Their mode of action, however, is mostly unclear to date since nuclear receptors are lacking in sensory neurons. Here we used immunocytochemistry and RT-PCR to study expression and distribution of sex hormone binding globulin (SHBG) in the rat olfactory system. Single sensory cells in the olfactory mucosa and their projections in the olfactory bulb showed specific SHBG immunostaining as determined by double immunofluorescence with olfactory marker protein OMP. Larger groups of SHBG stained sensory cells occurred in the vomeronasal organ (VNO). A portion of the olfactory glomeruli in the accessory olfactory bulb showed large networks of SHBG positive nerve fibres. Some of the mitral cells showed SHBG immune fluorescence. RT-PCR revealed SHBG encoding mRNA in the olfactory mucosa, in the VNO and in the olfactory bulbs indicating intrinsic expression of the binding globulin. The VNO and its related projections within the limbic system are known to be sensitive to gonadal steroid hormones. We conclude that SHBG may be of functional importance for rapid effects of olfactory steroids on limbic functions including the control of reproductive behaviours through pheromones.
authors.affiliation: Department of Anatomy II, University Hospital Jena, Friedrich Schiller University Jena, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Ploss
authors.affiliation: Department of Anatomy II, University Hospital Jena, Friedrich Schiller University Jena, Germany.
authors.forename: V M
authors.initials: VM
authors.lastname: Gebhart
authors.affiliation: Department of Anatomy II, University Hospital Jena, Friedrich Schiller University Jena, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Dölz
authors.affiliation: Department of Anatomy II, University Hospital Jena, Friedrich Schiller University Jena, Germany. Electronic address: Gustav.Jirikowski@med.uni-jena.de.
authors.forename: G F
authors.initials: GF
authors.lastname: Jirikowski
mesh_terms: D000818:Animals; D005455:Fluorescent Antibody Technique; D007031:Hypothalamus / Q000378:metabolism; D008297:Male; D009830:Olfactory Bulb / Q000166:cytology / Q000378:metabolism*; D051842:Olfactory Marker Protein / Q000378:metabolism; D009831:Olfactory Mucosa / Q000166:cytology / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D011984:Sensory Receptor Cells / Q000378:metabolism; D012738:Sex Hormone-Binding Globulin / Q000235:genetics / Q000378:metabolism*; D019147:Vomeronasal Organ / Q000166:cytology / Q000378:metabolism
chemical_list: D051842:Olfactory Marker Protein; D012333:RNA, Messenger; D012738:Sex Hormone-Binding Globulin
keywords: Olfactory bulb; Olfactory mucosa; RT-PCR; Vomeronasal organ