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Effects of serum deprivation on Ki-67-reactive antigen. Expression in HeLa cells
K Sasaki1, K Matsumura, T Murakami
1Department of Pathology, Yamaguchi University School of Medicine, Ube, Japan.
Insights
Cellular Ki-67 antigen levels decrease with serum deprivation, indicating reduced cell proliferation. Reintroducing serum restores Ki-67 expression, confirming its role as a marker for cellular growth conditions.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- The Ki-67 antigen is a well-established marker for cellular proliferation.
- Understanding the relationship between Ki-67 expression and cell cycle regulation is crucial for cancer research.
Purpose of the Study:
- To investigate the correlation between Ki-67-reactive antigen levels and cell proliferation activity.
- To examine the impact of serum deprivation on Ki-67 expression and proliferation in HeLa cells.
Main Methods:
- HeLa cells were cultured under serum-deprived conditions.
- Flow cytometry was utilized to assess Ki-67 antigen expression.
- Bromodeoxyuridine (BrdUrd) incorporation was measured to evaluate cell proliferation.
Main Results:
- Serum deprivation led to a decrease in Ki-67-reactive antigen levels and reduced BrdUrd incorporation.
- The reduction in Ki-67 expression was independent of the cell cycle phase.
- Upon refeeding with serum, Ki-67 levels and proliferation markers recovered within 24 hours.
Conclusions:
- Ki-67-reactive antigen levels serve as a reliable indicator of cellular growth status.
- Serum availability directly influences Ki-67 expression and cell proliferation in HeLa cells.
Abstract:
In order to elucidate the relationship between the level of cellular Ki-67-reactive antigen and cell proliferation activity, the effects of serum deprivation on the antigen expression and cell proliferation of HeLa cells were investigated using flow cytometry. The antigen was constitutively expressed in almost all cells cultured in normal medium containing 10% calf serum. In the serum- deprived cells, the antigen-negative fraction increased with culture time, and the level of Ki-67-reactive antigen fell rapidly during the first 24 h. The reduction in the antigen caused by serum deprivation was independent of the cell cycle phase. Both BrdUrd incorporation and the S phase fraction were diminished during the experiment with evidence of cell growth retardation. However, after refeeding with fresh normal medium, the antigen level that had been reduced by serum deprivation recovered to the level of the control cells within 24 h. These results suggest that the level of Ki-67-reactive antigen in cells reflects their growth condition.
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