Histopathological and immunohistochemical features in the medulla oblongata at the obex
of the Japanese atypical scrapie sheep. A, Focal microabscesses composed of neutrophils
with some macrophages (large arrows) and perivascular mononuclear cell cuffing (small
arrow) at the nucleus of the spinal tract of the trigeminal nerve. B, A single
intraneuronal vacuole (arrow) in the dorsal motor nucleus of the vagus nerve (DMNV). C,
Fine granular PrPSc immunolabeling with mAb T1 (arrows) in the neuropil of
the DMNV. D, Fine granular to globular PrPSc immunolabeling with mAb T1 in
the spinal tract of the trigeminal nerve. E, Granular PrPSc at the ad-axonal
location (yellow) in the white matter of the olivocerebellar tract. PrPSc
(green; Alexa Fluor 488) and myelin sheath (red; Alexa Fluor 546) were labeled with mAb
F99/97.6.1 and myelin basic protein (clone 12; Millipore, Billerica, MA, U.S.A.) and
imaged by confocal microscopy (LSM 510; Carl Zeiss, Oberkochen, Germany). F,
Colocalization of PrPSc (green; Alexa Fluor 488) and Listeria
monocytogenes (red; Alexa Fluor 546) in the necrotic lesion of the
spinocerebellar tract by dual immunofluorescence with mAb F99/97.6.1 and an antibody to
Listeria followed with TO-PRO-3 counterstaining (blue). Asterisk (*)
indicates axonal swelling.