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Use of immunogold electron microscopy and monoclonal antibodies in the identification of nuclear substructures

CV Clevenger and AL Epstein

A cytochemical technique for the ultrastructural localization of unique nuclear antigens is reported. Using a post-embedding indirect immunogold labeling procedure, nuclear antigens in electron-dense regions of the nucleus are localized with a minimum of nonspecific staining. Using this technique and indirect immunofluorescence, a panel of antinuclear monoclonal antibodies is shown to recognize preferentially cell cycle-dependent nuclear substructures. The antigenic domains recognized include specific regions in condensed chromatin, interchromatin granules, euchromatin, and chromosomes. The specificity of antigen recognition is demonstrated with qualitative and quantitative immunogold electron microscopy and immunoblot analysis. These results reveal the existence of previously undefined supramolecular organization within the nucleus and demonstrate the utility of the immunogold procedure when monoclonal antibodies are used.

Volume 32, Issue 7, pp. 757-765, 07/01/1984
Copyright © 1984 by The Histochemical Society


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