Expression of glial cell line-derived neurotrophic factor (GDNF) and GDNF family receptor alpha1 in mouse taste bud cells after denervation.
Glial cell line-derived neurotrophic' factor (GDNF) has been isolated as a neurotrophic factor that affects the survival and maintenance of central and peripheral neurons. Using immunocytochemical methods, we examined whether the taste bud cells in mouse circumvallate papillae after transection of the glossopharyngeal nerves expressed GDNF and its receptor, GDNF family receptor alpha1 (GFRalpha1). By 5 and 10 days after denervation, the number of taste buds had decreased markedly; however, the remaining taste bud cells still expressed GDNF and GFRalpha1. By 14 days after denervation, most of the taste buds had disappeared and GDNF- and GFRalpha1-immunoreactive cells were not seen. By 4 weeks after denervation, numerous TrkB-immunoreactive nerve fibers had invaded the papilla and a few taste buds expressing GDNF and GFRalpha1 had regenerated. Thus, GDNF- and GFRalpha1-immunoreactive taste bud cells after denervation vanished following the disappearance of the taste buds and reappeared at the same time as the taste buds reappeared.
Takeda
Masako
M
Department of Oral Anatomy, School of Dentistry, Health Sciences University of Hokkaido, Tobetsu, Ishikari, Hokkaido, Japan. matakeda@hoku-iryo-u.ac.jp
Suzuki
Yuko
Y
Obara
Nobuko
N
Uchida
Nobuhiko
N
Kawakoshi
Kentaro
K
D000818:Animals; D002452:Cell Count; D003714:Denervation; D015536:Down-Regulation; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D005930:Glossopharyngeal Nerve / Q000601:surgery; D061287:Glossopharyngeal Nerve Injuries; D051379:Mice; D009414:Nerve Growth Factors / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism*; D020813:Receptor, trkB / Q000378:metabolism; D013649:Taste / Q000502:physiology; D013650:Taste Buds / Q000166:cytology / Q000378:metabolism*; D013997:Time Factors; D014059:Tongue / Q000166:cytology* / Q000294:innervation / Q000502:physiology*
C495040:Gdnf protein, mouse; C494988:Gfra1 protein, mouse; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D009414:Nerve Growth Factors; D011518:Proto-Oncogene Proteins; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases; D020813:Receptor, trkB