Reference : AgNOR proteins from morphologically intact isolated nucleoli.
Scientific journals : Article
Life sciences : Anatomy (cytology, histology, embryology...) & physiology
AgNOR proteins from morphologically intact isolated nucleoli.
Vandelaer, M. [> > > >]
Thiry, Marc mailto [Université de Liège - ULiège > Département des sciences de la vie > Biologie cellulaire >]
Goessens, Guy mailto [Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
Life Sciences
Pergamon Press
Yes (verified by ORBi)
United Kingdom
[en] Animals ; Blotting, Western ; Carcinoma, Ehrlich Tumor/metabolism/ultrastructure ; Cell Nucleolus/metabolism/ultrastructure ; Mice ; Microscopy, Immunoelectron ; Molecular Weight ; Neoplasm Proteins/chemistry/isolation & purification/metabolism ; Nuclear Proteins/chemistry/isolation & purification/metabolism ; Silver Staining ; Tumor Cells, Cultured
[en] AgNOR staining has been proposed as a useful tool for the diagnosis and prognosis of cancer. The AgNOR proteins, however, have not yet been clearly identified and characterized, possibly due to the partial character of the results obtained when studying the proteins extracted from altered nucleoli isolated by "standard" methods. In the present study, we analysed, on western blots, the AgNOR staining profiles obtained with protein extracts from Ehrlich tumor cell nucleoli isolated by a recent procedure that preserves the nucleolar ultrastructure. In addition to the well-known C23 and B23 protein bands, we readily detected an extra band at approximately 125 Kda. By immunoblotting, we showed that this polypeptide may be related to the nucleolar phosphoprotein pp135 evidenced in rat-cell nucleoli. By immunoelectron microscopy, we detected this protein in the dense fibrillar component and fibrillar center of the nucleoli as well as the coiled bodies. The distribution coincides with the cytochemical AgNOR staining pattern obtained at the ultrastructural level.

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