Melatonin in in vitro apoptosis of H22 hepatocarcinoma cells / 中华肿瘤杂志
Chinese Journal of Oncology
; (12): 550-554, 2003.
Article
在 Zh
| WPRIM
| ID: wpr-271083
Responsible library:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To study the effect of melatonin (MLT) in in vitro apoptosis of hepatocarcinoma cells and its mechanism.</p><p><b>METHODS</b>The apoptotic cells, bcl-2 and bax were detected through immunocytochemical method (ICC) and Tolt-mediated x-duTP nick end labeling (TUNEL). Computer image analysis system was used to quantify the expression of bcl-2 and bax by detecting the absorbance value of positive products. Apoptosis index (AI) was used to quantify the number of apoptotic cells.</p><p><b>RESULTS</b>In vitro, AI increase was both concentration- and time-dependent through TUNEL. During the same duration, AI of medium dose group was higher than that of low dose and control group (P < 0.05); AI of high dose, medium dose and 5-Fu group were higher than those of low dose and control group (P < 0.01), however, there was no significant difference between the low dose and control group (P > 0.05). At the same dose, in high dose, medium dose and 5-Fu group, the change of AI showed significant difference from 24 to 36 hours (P < 0.05). The expression of bcl-2 was down-regulated as the MLT increased, and there was significant difference between the low dose and control group (P < 0.01). But, the expression of bax was up-regulated as the dose of MLT increased, showing significant difference between the high dose and control groups (P < 0.01). As time went on, the expression of bcl-2 was decreased and in every group, with the change in absorbance value of bcl-2 significantly different from 24 to 36 hours (P < 0.05), whereas that of bax remained almost unchanged. The ratio of bax/bcl-2 was increased with the increase in the concentration of MLT.</p><p><b>CONCLUSION</b>Melatonin may induce apoptosis in the hepatocarcinoma cells which is concentration- and time-dependent, in which bcl-2 and bax are involved.</p>
全文:
1
索引:
WPRIM
主要主题:
Pathology
/
Pharmacology
/
Time Factors
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Proto-Oncogene Proteins
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Apoptosis
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Carcinoma, Hepatocellular
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Proto-Oncogene Proteins c-bcl-2
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Cell Line, Tumor
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Dose-Response Relationship, Drug
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Drug Therapy
限制:
Humans
语言:
Zh
期刊:
Chinese Journal of Oncology
年:
2003
类型:
Article