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Proceedings Paper

Calcium-dependent trichosanthin-induced generation of reactive oxygen species involved in apoptosis of human choriocarcinoma cells
Author(s): Chunyang Zhang; Hui Ma; Die Yan Chen
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Paper Abstract

The type-I ribosome-inactivating protein trichosanthin (TCS) has a broad spectrum of biological and pharmacological activities, including abortifacient, anti-tumor and anti-HIV. We found for the first time that TCS induced production of reactive oxygen species (ROS) in JAR cells by using fluorescent probe 2',7'-dichlorofluorescin diacetate with confocal laser scanning microscopy. TCS-induced ROS showed dependence on the increase in intracellular calcium and on the presence of extracellular calcium. The production of ROS increased rapidly after the application of TCS, which paralleled TCS-indued increase in intracellular calcium monitored using fluo 3-AM, suggesting that TCS-induced ROS might mediate by the increase in intracellular Ca2PLU concentration. Simultaneous observation of the nuclear morphological changes and production of ROS in JAR cells with two-photon laser scanning microscopy and confocal laser scanning microscopy revealed that ROS involved in the apoptosis of JAR cells, which was confirmed by that antioxidant (alpha) -tocopherol prevented TCS-induced ROS formation and cell death. The finding that calcium-dependent TCS-induced ROS involved in the apoptosis of JAR cells might provide new insight into the anti-tumor and anti-HIV mechanism of TCS.

Paper Details

Date Published: 24 April 2001
PDF: 7 pages
Proc. SPIE 4262, Multiphoton Microscopy in the Biomedical Sciences, (24 April 2001); doi: 10.1117/12.424569
Show Author Affiliations
Chunyang Zhang, Tsinghua Univ. (China)
Hui Ma, Tsinghua Univ. (China)
Die Yan Chen, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4262:
Multiphoton Microscopy in the Biomedical Sciences
Ammasi Periasamy; Peter T. C. So, Editor(s)

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