Effects of High Protein Diet and Growth Hormone on Cancer Growth and Body Weight Change of Prostatic Cancer Induced Nude Mouse.
- Author:
Seok Heun JANG
1
;
Young Nam WOO
;
Sung Won KWON
Author Information
1. Department of Urology, Daejin Medical Center, Pundang Jesaeng General Hospital, Sungnam, Korea.
- Publication Type:Original Article
- Keywords:
Growth hormone;
Protein diet;
Prostatic cancer
- MeSH:
Animals;
Body Weight Changes*;
Body Weight*;
Carbon Dioxide;
Diet*;
Growth Hormone*;
Humans;
Inhalation;
Injections, Subcutaneous;
Mice;
Mice, Nude*;
Prostatic Neoplasms*;
Tumor Burden
- From:Korean Journal of Urology
1999;40(11):1493-1499
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The role of growth hormone in the tumor-bearing host is controversial because of its potential to stimulate tumor growth. So, this study was done to determine the effects of growth hormone on primary tumor growth and body weight change in tumor-bearing animals receiving either high protein or protein-depleted diet. MATERIALS AND METHODS: Tumors were induced in nude mice by subcutaneous injection of 1x106/ml PC-3 cells. Nude mice were fed with high protein diet at the time of tumor cell injection. Six weeks later, after measurable tumors were formed, the animals were randomized to receive either high protein diet(20.0% protein) or protein-depleted diet(0.04% protein). Animals in each dietary group were randomized to receive daily subcutaneous injections of either growth hormone(1,000 mU/kg) or placebo(normal saline) for 2 weeks. After then, animals were sacrificed by carbon dioxide inhalation, and, subsequently body weight and tumor volume were measured. RESULTS: At the end of the experiment, the body weights of group I(protein depleted diet+ormal saline) and II(protein depleted diet+growth hormone) were checked at 22.6+/-1.9 g and 24.9+/-1.6 g, respectively. But the body weights of group III(high protein diet+normal saline) and IV(high protein diet+growth hormone) increased to 32.5+/-1.2 g and 36.9+/-1.5 g, respectively. So in high protein diet group, body weight increases were observed and, in group which also had subcutaneous injections of growth hormone, the increases were more prominent. At the end of experiment, the tumor volumes of group I, II, III, and IV were checked at 0.88+/-0.02 cm3, 0.89+/-0.03 cm3, 1.31+/-0.02 cm3, and 1.30+/-0.02 cm3, respectively. So high protein diet group demonstrated large tumor volume increases, but there were no significant differences compared with group that also had subcutaneous injections of growth hormone, which implies growth hormone itself didn`t have large effect on tumor volume change. And, the ratios of tumor volume to body weight assessed at the end of experiment proved to be 3.94+/-0.33 %, 3.60+/-0.26 %, 3.89+/-0.08 %, and 3.54+/-0.18 % for group I, II, III, and IV, respectively which is showing no significant differences among them. CONCLUSIONS: These results suggest that the growth hormone dose not accelerate the growth of tumor volume in nude mice bearing prostatic cancer. Thus simultaneous treatment of growth hormone and high protein diet may improve the performance status without accelerating the growth of tumor volume in patients with advanced prostatic cancer.
