Subcellular localization of the inositol 1,4,5-trisphosphate receptor, P400, in the vestibular complex and dorsal cochlear nucleus of the rat.
The subcellular localization of the inositol 1,4,5-trisphosphate receptor protein, P400, was studied in the vestibular complex, an area to which Purkinje cells project, as well as in neurons of the dorsal cochlear nucleus and in ectopic Purkinje cells of adult rat brain. The receptor was demonstrated by electron microscopical immunocytochemistry using the avidin-biotin peroxidase complex procedure, with the monoclonal antibody 4C11 raised against mouse cerebellar inositol 1,4,5-trisphosphate receptor protein. Immunoreactivity was found in preterminal fibres and terminal boutons in the nuclei of the vestibular complex, generally associated with the subsurface systems and stacks or fragments of smooth endoplasmic reticulum. Ectopic Purkinje cells and cartwheel cells of the dorsal cochlear nucleus also displayed immunoreactivity, but this was much less intense in the latter. The results of the present study suggest that this receptor protein, involved in the release of Ca2+, is located in sites that enable it to influence the synthesis, transport and release of neurotransmitters.
Rodrigo
J
J
Unidad de Neuroanatomía Funcional, Instituto Cajal, C.S.I.C., Madrid, Spain.
Uttenthal
O
O
Bentura
M L
ML
Maeda
N
N
Mikoshiba
K
K
Martinez-Murillo
R
R
Polak
J M
JM
D000818:Animals; D001306:Auditory Pathways / Q000378:metabolism* / Q000648:ultrastructure; D001921:Brain / Q000378:metabolism* / Q000648:ultrastructure; D015220:Calcium Channels / Q000378:metabolism*; D017626:Cochlear Nucleus / Q000378:metabolism*; D004721:Endoplasmic Reticulum / Q000378:metabolism; D007150:Immunohistochemistry; D053496:Inositol 1,4,5-Trisphosphate Receptors; D008297:Male; D008854:Microscopy, Electron; D011689:Purkinje Cells / Q000378:metabolism / Q000648:ultrastructure; D051381:Rats; D017208:Rats, Wistar; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D013347:Subcellular Fractions; D014726:Vestibular Nuclei / Q000378:metabolism*
D015220:Calcium Channels; D053496:Inositol 1,4,5-Trisphosphate Receptors; D018160:Receptors, Cytoplasmic and Nuclear