Document Detail

Evidence of solitary chemosensory cells in a large mammal: the diffuse chemosensory system in Bos taurus airways.
MedLine Citation:
PMID:  16928202     Owner:  NLM     Status:  MEDLINE    
The diffuse chemosensory system (DCS) of the respiratory apparatus is composed of solitary chemosensory cells (SCCs) that resemble taste cells but are not organized in end organs. The discovery of the DCS may open up new approaches to respiratory diseases. However, available data on mammalian SCCs have so far been collected from rodents, the airways of which display some differences from those of large mammals. Here we investigated the presence of the DCS and of SCCs in cows and bulls (Bos taurus), in which the airway cytology is similar to that in humans, focusing our attention on detection in the airways of molecules involved in the transduction cascade of taste [i.e. alpha-gustducin and phospholipase C of the beta2 subtype (PLCbeta2)]. The aim of the research was to extend our understanding of airway chemoreceptors and to compare the organization of the DCS in a large mammal with that in rodents. Using immunocytochemistry for alpha-gustducin, the taste buds of the tongue and arytenoid were visualized. In the trachea and bronchi, alpha-gustducin-immunoreactive SCCs were frequently found. Using immunocytochemistry for PLCbeta2, the staining pattern was generally similar to those seen for alpha-gustducin. Immunoblotting confirmed the expression of alpha-gustducin in the tongue and in all the airway regions tested. The study demonstrated the presence of SCCs in cows and bulls, suggesting that DCSs are present in many mammalian species. The description of areas with a high density of SCCs in bovine bronchi seems to indicate that the view of the DCS as made up of isolated cells totally devoid of ancillary elements is probably an oversimplification.
Marco Tizzano; Flavia Merigo; Andrea Sbarbati
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of anatomy     Volume:  209     ISSN:  0021-8782     ISO Abbreviation:  J. Anat.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-08-24     Completed Date:  2007-01-18     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  0137162     Medline TA:  J Anat     Country:  England    
Other Details:
Languages:  eng     Pagination:  333-7     Citation Subset:  IM    
Department of Morphological-Biomedical Sciences, Section of Anatomy and Histology, University of Verona, Verona, Italy.
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MeSH Terms
Bronchi / anatomy & histology*,  chemistry
Cattle / anatomy & histology*
Chemoreceptor Cells / cytology*
Immunohistochemistry / methods
Isoenzymes / analysis
Phospholipase C beta
Tongue / cytology
Trachea / anatomy & histology*,  chemistry
Transducin / analysis
Type C Phospholipases / analysis
Reg. No./Substance:
0/Isoenzymes; 147979-21-3/Gnat3 protein, rat; EC 3.1.4.-/Type C Phospholipases; EC C beta; EC protein, rat; EC 3.6.1.-/Transducin

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