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Intranuclear localization of the Ki-67 reactive antigen in HeLa cells. Flow cytometric analysis
K Sasaki1, K Matsumura, T Murakami
1Department of Pathology, Yamaguchi University School of Medicine, Ube-Shi, Japan.
Insights
The Ki-67 antigen, crucial for cell proliferation, is closely linked to DNA within the cell nucleus. DNase I treatment, which degrades DNA, significantly reduced Ki-67
Area of Science:
- Cell Biology
- Molecular Biology
- Immunocytochemistry
Background:
- The Ki-67 protein is a well-established marker for cell proliferation.
- Its precise intranuclear localization and molecular associations are not fully understood.
Purpose of the Study:
- To investigate the intranuclear localization of the Ki-67 antigen.
- To determine the molecular associations of the Ki-67 antigen within the nucleus.
Main Methods:
- Immunocytochemistry using the Ki-67 monoclonal antibody.
- Flow cytometry analysis of HeLa S3 cells.
- In situ enzymatic treatments with HCl, NaCl, RNase, S1 nuclease, and DNase I.
Main Results:
- Ki-67 immunofluorescence intensity was markedly diminished by DNase I treatment.
- Nuclear fluorescence of Ki-67 was abolished in cells treated with high concentrations of DNase I.
- HCl, NaCl, RNase, and S1 nuclease treatments did not significantly affect Ki-67 immunofluorescence.
Conclusions:
- The Ki-67 antigen is closely associated with DNA within the cell nucleus.
- The Ki-67 antigen is not directly associated with the nuclear matrix or histones.
- These findings provide insights into the molecular environment of the Ki-67 antigen during cell proliferation.
Abstract:
The intranuclear localization of the Ki-67 reactive antigen was immunocytochemically investigated using flow cytometry. HeLa S3 cells were immunocytochemically stained with the monoclonal antibody, Ki-67, after in situ treatments with various kinds of compounds, namely: HCl; NaCl; RNase; S1 nuclease and DNase I. The only treatment that markedly diminished the immunofluorescence intensity of the cells was exposure to DNase I. Nuclear fluorescence was no longer observed in the cells digested with relatively high concentrations of DNase I. These results suggest that the antigen recognized by Ki-67 is closely associated with DNA, but is not directly associated with either the nuclear matrix or histones.
