Death mode of Hep-3B and A549 tumor cells induced by bluetongue virus strain HbC3
Chen, J.; Hu, J.; Dong, C-yuan.; Liang, K.; Dai, Y.; Gao, J.
Zhonghua Zhong Liu Za Zhi 29(7): 505-509
2007
ISSN/ISBN: 0253-3766 PMID: 18069629 Document Number: 605746
Objective To study the death mode of human hepatocellular carcinoma Hep-3B cells and human lung adenocarcinoma A549 cells induced by bluetongue virus strain HbC(3) (BTV-HbC(3)) and the mechanism of its action. Methods BTV-HbC(3) was used to infect the tumor cells, and the cytopathic effects (CPE) was observed. TUNEL staining was used to detect the apoptosis of tumor cells induced by BTV-HbC(3). The changes of endoplasmic reticulum and nuclei treated with BTV-HbC(3) were further examined by laser scanning confocal microscopy. The activities of caspase-3/7, caspase-8 and caspase-9 were determined by fluorescence analysis. Results Hep-3B cells were sensitive to BTV-HbC(3). Lots of early apoptotic cells were found by TUNEL staining. The laser scanning confocal microscopic examination showed characteristics of apoptosis, such as pyknotic nuclei, margination of nuclear chromatin and vacuolization of endoplasmic reticulumin in Hep-3B cells exposed to BTV-HbC(3). The activity of caspase-3/7 was increased, but the activity changes of caspase-8 and caspase-9 were not found. A549 cells were sensitive to BTV-HbC(3) too. But no apoptotic cells were observed by TUNEL staining. The results of laser scanning confocal microscopy showed marked vacuolization of endoplasmic reticulum, but chromatin margination was not found after A549 cells was exposed to BTV-HbC(3). The activity of caspase-3/7 and caspase-9 was increased, but the activity of caspase-8 was not changed. Conclusion BTV-HbC(3) induces apoptosis of Hep-3B tumor cells mainly through endoplasmic reticulum signal transduction pathway, and the features of cell death in A549 cells could be described as paraptosis.