alpha-gustducin-immunoreactive solitary chemosensory cells in the developing chemoreceptorial epithelium of the rat vallate papilla

The presence of solitary chemosensory cells was studied in rat vallate papi llae during the first week of post-natal life by alpha-gustducin immunocyto chemistry. In 1- to 3-day-old rats, isolated alpha-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 w rapped in alpha-gustducin-negative epithelial cells in a glia-like fashion. The alpha-gustducin-immunoreactive cells were usually round and some of th em gave rise to short, large processes directed towards the lumen of the or al cavity or the basal lamina. Rarely, some cells showed an evident bipolar shape. Small taste buds containing either alpha-gustducin-immunoreactive o r alpha-gustducin-negative cells appeared in the vallate papillae of 4-day- old rats in which isolated, bipolar-shaped alpha-gustducin-immunoreactive c ells were also found. After the first week of post-natal life, the taste bu ds appeared basically similar to those of adult animals. In conclusion, the present study demonstrates that the presence of epithelial cells with char acteristics of solitary chemosensory cells precedes the development of the taste buds.