Xiao-Feng Zhang1, Bai-Xiang Li, Chun-Yan Dong, Rui Ren. 1. Department of Toxicology, Public Health College, Harbin Medical University, 157 Baojian Road, Nangang District, Harbin 150081, Heilongjiang Province, China.
Abstract
AIM: To investigate the effect of exogenous ceramide-induced apoptosis on human colon carcinoma HT-29 cells. METHODS: Light microscope, transmission electron microscope and fluorescence microscope were used to observe the morphology change of apoptosis in HT-29 cells. Agarose gel electrophoresis was performed to detect the DNA fragment. Mitochondrial function was detected by MTT assay. mRNA expression of Bcl-2 family gene members was determined by reverse transcription polymerase chain reaction (RT-PCR) assay. RESULTS: After C2-ceramide treatment, typical characteristics of apoptosis, such as nuclear chromatin breakage, apoptotic body and DNA ladder, could be observed. After exposure to 50 micromol/L C2-ceramide for 12 and 24 h, cell apoptosis was 64.1% and 81.3% respectively, which had a time-and dose-effect relationship. Mitochondrial function started to decrease from 6 h after exposure to ceramide. Meanwhile, ceramide up-regulated or down-regulated the mRNA expression of Bcl-2 family gene members. CONCLUSION: Ceramide induces apoptosis of human colon carcinoma HT-29 cells by affecting the expression of Bcl-2 family gene members and impacting the mitochondrial function.
AIM: To investigate the effect of exogenous ceramide-induced apoptosis on humancolon carcinoma HT-29 cells. METHODS: Light microscope, transmission electron microscope and fluorescence microscope were used to observe the morphology change of apoptosis in HT-29 cells. Agarose gel electrophoresis was performed to detect the DNA fragment. Mitochondrial function was detected by MTT assay. mRNA expression of Bcl-2 family gene members was determined by reverse transcription polymerase chain reaction (RT-PCR) assay. RESULTS: After C2-ceramide treatment, typical characteristics of apoptosis, such as nuclear chromatin breakage, apoptotic body and DNA ladder, could be observed. After exposure to 50 micromol/L C2-ceramide for 12 and 24 h, cell apoptosis was 64.1% and 81.3% respectively, which had a time-and dose-effect relationship. Mitochondrial function started to decrease from 6 h after exposure to ceramide. Meanwhile, ceramide up-regulated or down-regulated the mRNA expression of Bcl-2 family gene members. CONCLUSION:Ceramide induces apoptosis of humancolon carcinoma HT-29 cells by affecting the expression of Bcl-2 family gene members and impacting the mitochondrial function.
Authors: Svitlana M Kurinna; Chun Chui Tsao; Alina Felicia Nica; Tilahun Jiffar; Peter P Ruvolo Journal: Cancer Res Date: 2004-11-01 Impact factor: 12.701
Authors: Maria van Gurp; Nele Festjens; Geert van Loo; Xavier Saelens; Peter Vandenabeele Journal: Biochem Biophys Res Commun Date: 2003-05-09 Impact factor: 3.575
Authors: Claire M Payne; Cheray Crowley-Skillicorn; Hana Holubec; Katerina Dvorak; Carol Bernstein; Mary Pat Moyer; Harinder Garewal; Harris Bernstein Journal: J Toxicol Date: 2009-05-10