蟾毒灵对裸鼠人肝癌移植瘤的抑制作用及对Bcl-2和Bax蛋白表达的影响

doi:10.3736/jcim20070211

Abstract

Objective: To investigate the anti-tumor effect of bufalin and its regulation on Bcl-2 and Bax proteins in orthotopically transplanted tumor of human hepatocellular carcinoma in nude mice.

Methods: Orthotopically transplanted tumor of human hepatocellular carcinoma was established in nude mice. The mice were randomly divided into five groups: high-dose bufalin-treated group (1.5 mg/kg), medium-dose bufalin-treated group (1 mg/kg), low-dose bufalin-treated group (0.5 mg/kg), adriamycin-treated group (8.0 mg/kg), and normal saline-treated group. After 25 days, mice were sacrificed. The tumor volume was measured, and the pathological changes of tumor tissues were detected by HE staining to observe the tumor necrosis degree. Cell morphological changes were also observed by an electron microscopy. Label index of tumor cell apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL), and the expressions of Bcl-2 and Bax proteins were determined by immunohistochemical method.

Results: The tumor volume in the bufalin-treated groups was shrunk significantly compared with that in the normal saline-treated group (P＜0.01). The survival time of the bufalin-treated groups was prolonged compared with that of the adriamycin-treated group and the normal saline-treated group (P＜0.05). Apoptotic characteristics could be seen in tumor tissues of the bufalin-treated groups. The label index of tumor cell apoptosis in the bufalin-treated groups (5.87±2.13, 8.86±2.96 and 10.60±3.42 in low-, medium- and high-dose groups respectively) was higher than that in the adriamycin-treated group (3.28 ±0.98) (P＜0.05, P＜0.01). The expression of Bax was up-regulated, while no changes were detected as to Bcl-2 protein in tumors of the bufalin-treated groups.

Conclusion: Bufalin has significant anti-tumor effect on the orthotopically transplanted tumor of human hepatocellular carcinoma in nude mice. Its effect might be related to up-regulation of Bax protein and inducement of the tumor cell apoptosis.

Key words: bufalin, liver neoplasms, apoptosis, Bcl-2, Bax, nude mice

CLC Number:

R735.7

Wei Gu, Ke-qi Han, Yong-hua Su, Xue-qiang Huang, Chang-quan Ling. Inhibition action of bufalin on human transplanted hepatocellular tumor and its effects on expressions of Bcl-2 and Bax proteins in nude mice. Journal of Chinese Integrative Medicine, 2007, 5(2): 155-159.

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URL: http://www.jcimjournal.com/EN/10.3736/jcim20070211

http://www.jcimjournal.com/EN/Y2007/V5/I2/155

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References 14

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Group	n	Body weight (g)		Tumor volume (mm³)		Tumor inhibition rate
Group	n	Pre-treatment	Post-treatment	Pre-treatment	Post-treatment	Tumor inhibition rate
High-dose bufalin-treated	10	20.94±1.00	21.39±1.62*	43.50±5.09	35.21±12.51^△△	79.3％*
Medium-dose bufalin-treated	10	20.03±1.16	21.48±1.10*	42.92±4.10	49.83±11.46^△△	70.70%
Low-dose bufalin-treated	10	21.06±0.94	21.57±1.14*	43.00±2.97	83.99±24.63^△△	50.70%
ADM-treated	10	21.00±1.00	18.90±0.77	42.93±4.23	55.17±16.13^△△	67.60%
NS-treated	10	20.95±1.07	20.40±1.23	43.37±4.82	170.39±25.29	1

Group	n	Label index (%)
Group	n	Apoptosis	Bcl-2	Bax
High-dose bufalin-treated	10	10.60±3.42**	8.76±5.18	90.70±16.82**
Medium-dose bufalin-treated	10	8.86±2.96**	8.52±3.57	80.21±21.23**
Low-dose bufalin-treated	10	5.87±2.13*	11.34±6.24	79.54±10.75**
ADM-treated	10	4.26±2.12	10.59±6.92	47.56±15.31*
NS-treated	10	3.28±0.98	9.05±4.97	31.25±12.50

Inhibition action of bufalin on human transplanted hepatocellular tumor and its effects on expressions of Bcl-2 and Bax proteins in nude mice

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