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KMID : 0855520130260030105
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Korean Journal of Physical Anthropology
2013 Volume.26 No. 3 p.105 ~ p.114
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Gambogic Acid Induced Apoptosis through Activation of Caspase-dependent Pathway in Aortic Smooth Muscle Cells
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Kim Dae-Kwang
Lee Tae-Jin
Kim Eun-Ae
Kang Ju-Hwan
Kim Kyung-Gon
Kim Joo-Young
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Abstract
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Gambogic acid (GA) has powerful apoptotic actions. The authors investigated whether GA has apoptotic effects on aortic smooth muscle cells, and compared its potency with that of simvastatin.
Smooth muscle cells were isolated from the aortas of Sprague-Dawley rats (4-6 week). Cell purities were confirmed by IF staining using α-smooth muscle actin antibody. The IC50 values for cell death by GA and simvastatin were determined using a MTT assay, and the apoptotic effects of 1 μM GA or 30 μM simvastatin (concentrations correspond to IC50 values) were determined after 24 h of treatment using live cell images and by FITC annexin-V and propidium iodide double-staining. In addition, western blotting was used to evaluate apoptosis by quantifying reductions in the expression levels of the PARP and procaspase-3 as well as cleavages of PARP and procaspase-3 after treatment with 1 μM GA or 30 μM simvastatin. The IC50 of GA (1 μM) was lower than that of simvastatin (30 μM). Cell numbers were markedly reduced by both drugs in live cell images. GA (1 μM) produced a higher level of apoptosis than 30 μM simvastatin (26.4±2.37% vs. 8.3±1.54%, respectively; P?0.05, n=3) by FITC annexin-V & PI double-staining. In addition, 1 μM GA reduced the expressions of PARP, procaspase-3, and Mcl-1 in cells, whereas 30 μM simvastatin did not. Pretreatment with z-VAD-fmk attenuated GA-induced apoptosis and the cleavages of PARP and procaspase-3. The decreased level of Mcl-1 protein induced by GA treatment was recovered by z-VAD-fmk.
These results indicate that GA-induced apoptosis was mediated by a caspase-dependent pathway.
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KEYWORD
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Gambogic acid, Apoptosis, Smooth muscle cells, Simvastatin
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