ISSN:
1432-0533
Keywords:
Proliferating cell nuclear antigen (PCNA)
;
Ki-67
;
Medulloblastoma
;
Apoptosis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The distribution of proliferating cell nuclear antigen (PCNA)-(clone PC 10)- and Ki-67- (clone MIB-1)-positive nuclei was investigated in 60 medulloblastomas of childhood. Although the labeling index of the two markers did not coincide, both showed a wide range of parallel variations. The percentage of positive nuclei was similar in both classic and desmoplastic tumors. A variable proliferation capacity was found in the different tumor structures. Areas with neuronal and glial differentiation showed very few positive nuclei; these were very abundant in the infiltration areas, and along penetrating vessels from subarachnoidal growths. Pale islands were negative or positive only in their peripheral part. Large-cell areas were richer in positive nuclei than classic ones, accounting for their more malignant character. Hyperchromatic round nuclei, not belonging to necrotic foci and called lymphocyte-like nuclei, differently interpreted in the past, were vairiably found in every case. They are known, from previous experience, to stain orange with Acridine Orange fluorochroming, like single-stranded DNA. They were not easily distinguishable from mitoses and were stained by in situ end-labeling of DNA strand breaks, as demonstrated by incorporation of labeled nucleotides. They were regarded as possible apoptotic nuclei, representing either a peculiar type of cell death or the preservation of the cell deletion capacity, typical of the embryonal tissue of origin.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00313605
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