Chem. Senses 24: 469-472,
1999
© Oxford University Press 1999
-Gustducin-immunoreactive Solitary Chemosensory Cells in the Developing Chemoreceptorial Epithelium of the Rat Vallate Papilla
Institute of Human Anatomy and Histology, University of Verona, Verona, Italy
Correspondence to be sent to: Andrea Sbarbati, Institute of Anatomy and Histology, University of Verona, Medical Faculty, Strada Le Grazie 8, I-37134, Verona, Italy. e-mail:sbarbati{at}borgoroma.univ.it
The presence of solitary chemosensory cells was studied in rat vallate papillae during
the first week of post-natal life by 
-gustducin immunocytochemistry. In 1- to 3-day-old
rats, isolated -gustducin-immunoreactive cells were found within the epithelium of the
vallate papilla. These cells, mainly located in the basal layer, were scattered among keratocytes
and wrapped in -gustducin-negative epithelial cells in a glia-like fashion. The
-gustducin-immunoreactive cells were usually round and some of them gave rise to short,
large processes directed towards the lumen of the oral cavity or the basal lamina. Rarely, some
cells showed an evident bipolar shape. Small taste buds containing either
-gustducin-immunoreactive or -gustducinnegative cells appeared in the vallate
papillae of 4-day-old rats in which isolated, bipolar-shaped -gustducin-immunoreactive
cells were also found. After the first week of post-natal life, the taste buds appeared basically
similar to those of adult animals. In conclusion, the present study demonstrates that the presence
of epithelial cells with characteristics of solitary chemosensory cells precedes the development of
the taste buds.
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