title: Immunohistochemical expression of P400 protein in Purkinje cells of sphingomyelinosis mouse.
abstract: Immunohistochemical expression of P400 protein, a glycoprotein localized to the Purkinje cell membrane, has been studied in the cerebellum of spm mouse using anti-P400 monoclonal antibody. The initial change observed in the Purkinje cells was a swelling of the cell body with distortion of the neurites; this occurred as early as 5 weeks of age. A significant, patchy loss of Purkinje cells started at 6 weeks before cerebellar signs became manifest. With progression of the disease the dendritic processes in the molecular layer showed a marked swelling, followed by irregular arborization and finally by disintegration. A few, heterotopic Purkinje cells were found in the subcortical white matter; this was interpreted as an indication that a disturbance in neuronal migration could be superimposed on the sphingolipid metabolic disorder. Additionally, P400-immunoreactive nerve cells were occasionally encountered in areas of the deep cerebellar nuclei and in the lateral vestibular nuclei of the pontine tegmentum. The number of P400-immunoreactive Purkinje cells correlated well with the percentages of the remaining Purkinje cells during the ages of 4 to 7 wks. At the late stage of 10 to 12 weeks almost all Purkinje cells had lost their P400-immunoreactivity. It is suggested that Purkinje cells that fail to express P400 protein may undergo an immunohistochemical degeneration of the plasma membrane.
authors.affiliation: Division of Neuropathology, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Tanaka
authors.forename: S
authors.initials: S
authors.lastname: Miyawaki
authors.forename: N
authors.initials: N
authors.lastname: Maeda
authors.forename: K
authors.initials: K
authors.lastname: Mikoshiba
mesh_terms: D000375:Aging / Q000473:pathology; D000818:Animals; D015220:Calcium Channels; D002452:Cell Count; D002531:Cerebellum / Q000473:pathology; D004195:Disease Models, Animal; D007150:Immunohistochemistry; D053496:Inositol 1,4,5-Trisphosphate Receptors; D008562:Membrane Glycoproteins / Q000032:analysis*; D051379:Mice; D008818:Mice, Neurologic Mutants; D009419:Nerve Tissue Proteins / Q000032:analysis*; D009542:Niemann-Pick Diseases / Q000378:metabolism* / Q000473:pathology; D011149:Pons / Q000473:pathology; D011689:Purkinje Cells / Q000737:chemistry* / Q000473:pathology; D018160:Receptors, Cytoplasmic and Nuclear
chemical_list: D015220:Calcium Channels; D053496:Inositol 1,4,5-Trisphosphate Receptors; C025389:Itpr1 protein, mouse; D008562:Membrane Glycoproteins; D009419:Nerve Tissue Proteins; D018160:Receptors, Cytoplasmic and Nuclear