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Chemical Senses Advance Access originally published online on September 22, 2005
Chemical Senses 2005 30(8):707-717; doi:10.1093/chemse/bji063
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Timing of Neuronal Intermediate Filament Proteins Expression in the Mouse Vomeronasal Organ During Pre- and Postnatal Development. An Immunohistochemical Study

Flavia Merigo1, Carla Mucignat-Caretta2 and Carlo Zancanaro1

1 Anatomy and Histology Section, Department of Morphological and Biomedical Sciences, University of Verona, Strada Le Grazie 8, I-37134 Verona, Italy and 2 Department of Anatomy and Physiology, University of Padua, Via Marzolo, 35100 Italy

Correspondence to be sent to: Carlo Zancanaro, Section of Anatomy and Histology, Department of Morphological and Biomedical Sciences, University of Verona, Strada Le Grazie 8, I-37134 Verona, Italy. e-mail: carlo.zancanaro{at}univr.it

Several types of intermediate filament proteins are expressed in developing and mature neurons; they cooperate with other cytoskeletal components to sustain neuronal function from early neurogenesis onward. In this work the timing of expression of nestin, peripherin, internexin, and the neuronal intermediate filament triplet [polypeptide subunits of low (NF-L), medium (NF-M), and high (NF-H) molecular weight] was investigated in the developing fetal and postnatal mouse vomeronasal organ (VNO) by means of immunohistochemistry. The results show that the sequence of expression of intermediate filament proteins is internexin, nestin, and NF-M in the developing vomeronasal sensory epithelium; internexin, peripherin, and NF-M in the developing vomeronasal nerve; and nestin, internexin and peripherin, NF-L, and NF-M in the nerve supply to accessory structures of the VNO. At sexual maturity (2 months) NF-M is only expressed in vomeronasal neurons and NF-M, NF-L and peripherin are expressed in extrinsic nerves supplying VNO structures. The differential distribution of intermediate filament proteins in the vomeronasal sensory epithelium and nerve is discussed in terms of the cell types present therein. It is concluded that several intermediate filament proteins are sequentially expressed during intrauterine development of the VNO neural structures in a different pattern according to the different components of the VNO.

Key words: nestin, peripherin, internexin, NF-L, NF-M, NF-H


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