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Cell Growth & Differentiation, Vol 3, Issue 3 149-156, Copyright © 1992 by American Association of Cancer Research


ARTICLES

Cell type and differentiation dependent heterogeneity in retinoblastoma protein expression in SCID mouse fetuses

L Szekely, WQ Jiang, F Bulic-Jakus, A Rosen, N Ringertz, G Klein and KG Wiman
Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden.

The expression pattern of retinoblastoma (Rb) protein has been studied at the single cell level in frozen sections of 16- to 18-day-old SCID mouse fetuses by immunofluorescence staining with mouse monoclonal and rabbit polyclonal antibodies, using conventional epifluorescence and confocal laser scanning microscopy. The nuclei of megakaryocytes, hemopoietic islands of the fetal liver, osteo-, amelo-, and odontoblasts, and skeletal muscle were strongly stained. There was no detectable Rb staining in the basal cell layers of stratified squamous epithelia, but the differentiating, more superficial layers were positive. Intestinal crypts were negative, whereas the villi were positive. In the retina, Rb protein was detectable in the inner ganglion layer but not in the outer neuroblastic layer. In the central nervous system, Rb protein was present in neurons and glia cells as well. The nuclei in the collecting tubules of the kidney, the pancreas, and the adrenal cortex were Rb positive. Analysis of the differentiation dependent expression of Rb protein in relation to the prospective life cycle of the cells in which it appears may pave the way toward an understanding of the tissue specific oncogenic effect of Rb loss in families with hereditary retinoblastoma.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1992 by the American Association of Cancer Research.