TY - JOUR
T1 - Ultrastructure of the olfactory epithelium in intact, axotomized, and bulbectomized goldfish, Carassius auratus
AU - Hansen, Anne
AU - Zippel, Hans Peter
AU - Sorensen, Peter W.
AU - Caprio, John
PY - 1999/5/15
Y1 - 1999/5/15
N2 - The ultrastructure of the olfactory epithelium in intact, axotomized, and bulbectomized goldfish was studied by scanning and transmission electron microscopy. A total of 58 adult goldfish of various survival times were examined to determine whether the different types of surgery-either olfactory nerve transection or bulbectomy-yielded differences in the extent or time course of cellular degeneration and renewal. Control animals were also examined in detail to elucidate previous controversial findings concerning the types of olfactory receptor neurons present in goldfish. We found that the intact olfactory epithelium of unoperated control goldfish contains the previously observed ciliated and microvillous receptor neurons, and the crypt cell, a cell type not yet seen in the goldfish but recently reported in other species of teleosts. Following either olfactory nerve transection or bulbectomy, the olfactory receptor neurons showed similar signs of degeneration and subsequent cell death, but, surprisingly, the thickness of the olfactory epithelium did not change significantly with either treatment. The time course of receptor cell renewal was different in axotomized and bulbectomized goldfish. In axotomized goldfish, the amount of receptor cells decreased continuously until 8-13 days after surgery, followed by rapid cell renewal. For bulbectomized goldfish, cell replacement began almost immediately after surgery, with degeneration and cell renewal occurring simultaneously. Six weeks after bulbectomy, cell death and cell proliferation reached a 'steady state,' and the epithelia did not further improve.
AB - The ultrastructure of the olfactory epithelium in intact, axotomized, and bulbectomized goldfish was studied by scanning and transmission electron microscopy. A total of 58 adult goldfish of various survival times were examined to determine whether the different types of surgery-either olfactory nerve transection or bulbectomy-yielded differences in the extent or time course of cellular degeneration and renewal. Control animals were also examined in detail to elucidate previous controversial findings concerning the types of olfactory receptor neurons present in goldfish. We found that the intact olfactory epithelium of unoperated control goldfish contains the previously observed ciliated and microvillous receptor neurons, and the crypt cell, a cell type not yet seen in the goldfish but recently reported in other species of teleosts. Following either olfactory nerve transection or bulbectomy, the olfactory receptor neurons showed similar signs of degeneration and subsequent cell death, but, surprisingly, the thickness of the olfactory epithelium did not change significantly with either treatment. The time course of receptor cell renewal was different in axotomized and bulbectomized goldfish. In axotomized goldfish, the amount of receptor cells decreased continuously until 8-13 days after surgery, followed by rapid cell renewal. For bulbectomized goldfish, cell replacement began almost immediately after surgery, with degeneration and cell renewal occurring simultaneously. Six weeks after bulbectomy, cell death and cell proliferation reached a 'steady state,' and the epithelia did not further improve.
KW - Bulbectomy
KW - Electron microscopy
KW - Nerve lesion
KW - Olfactory organ
KW - Regeneration
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U2 - 10.1002/(SICI)1097-0029(19990515/01)45:4/5<325::AID-JEMT16>3.0.CO;2-V
DO - 10.1002/(SICI)1097-0029(19990515/01)45:4/5<325::AID-JEMT16>3.0.CO;2-V
M3 - Article
C2 - 10383125
AN - SCOPUS:0033563293
SN - 1059-910X
VL - 45
SP - 325
EP - 338
JO - Microscopy Research and Technique
JF - Microscopy Research and Technique
IS - 4-5
ER -