Studies of apoptosis of malignant lymphoma cells induced by arsenic trioxide
1Institute of Hematology, Medical College of Jinan University, Guangzhou, 510632, P. R. China. tzyuan@jnu.edu.cn
Abstract:
The present study investigated the effect of As(2)O(3)on malignant lymphoma cells. Cell apoptosis was detected by cell staining and TdT-mediated dUTP Nick-end Labelling (TUNEL). Cellular DNA and protein expression content were determined by immunohistochemistry and flow cytometry. It was found that 0.5-2.0 microm /l As(2)O(3)could inhibit cell growth, including Raji cells and lymphoma cells from patients, and induce apoptosis, such as condensed chromatin and nuclear fragmentation with intact cell membrane, i.e. apoptotic body. It was also found that the cells of the sub-G(1)phase increased significantly and bcl-2 gene expression was greatly downregulated. However, this effect was not observed for Jurkat cells under the same conditions. We concluded that As(2)O(3)at a range of 0.5-2.0 microm /l can inhibit the growth and induce apoptosis in malignant lymphoma cells, which may have therapeutic potential.
Insights
Arsenic trioxide (As(2)O(3)) effectively inhibits malignant lymphoma cell growth and induces apoptosis. This compound shows potential for lymphoma cancer therapy by downregulating bcl-2 gene expression.
Area of Science:
- Oncology
- Cell Biology
- Pharmacology
Background:
- Malignant lymphoma is a significant health concern.
- Understanding novel therapeutic agents for lymphoma is crucial.
- Arsenic compounds have shown anti-cancer properties.
Purpose of the Study:
- To investigate the effects of arsenic trioxide (As(2)O(3)) on malignant lymphoma cells.
- To determine the mechanism of As(2)O(3)-induced cell death.
- To evaluate the therapeutic potential of As(2)O(3) in lymphoma.
Main Methods:
- Cell apoptosis detection using cell staining and TdT-mediated dUTP Nick-end Labelling (TUNEL).
- Quantification of cellular DNA and protein expression via immunohistochemistry and flow cytometry.
- Assessment of cell cycle phase distribution and bcl-2 gene expression.
Main Results:
- As(2)O(3) (0.5-2.0 microm/L) inhibited growth in Raji cells and patient-derived lymphoma cells.
- As(2)O(3) induced apoptosis, characterized by condensed chromatin and apoptotic bodies.
- Significant increase in sub-G(1) phase cells and downregulation of bcl-2 gene expression were observed.
- Jurkat cells did not exhibit the same sensitivity to As(2)O(3).
Conclusions:
- As(2)O(3) demonstrates significant anti-proliferative and pro-apoptotic effects on malignant lymphoma cells.
- The downregulation of bcl-2 gene expression may contribute to As(2)O(3)-induced apoptosis.
- As(2)O(3) presents a potential therapeutic agent for malignant lymphoma.
