Effect of growth hormone on tumor and host in an animal model |
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Authors: | Ronald F Wolf MD Bruce Ng BS Benny Weksler MD Michael Burt MD PhD Dr Murray F Brennan MD |
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Institution: | (1) From the Surgical Metabolism Laboratory, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York, USA |
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Abstract: | Background: The relative effects of growth hormone on tumor versus host growth and protein metabolism are not known. This study examines
the influence of recombinant rat growth hormone (r-rGH) on host and tumor growth, host body composition, and protein synthesis
of tumor and host in tumor-bearing rats.
Methods: After left flank implantation of methylcholanthrene-induced sarcoma, 28 Fischer rats with palpable tumor were treated with
s.c. saline or 1 mg/kg/day r-rGH for 11 days. At death, fractional protein synthetic rates (FSRs) of tumor, liver, and gastrocnemius
muscle were determined. In a separate experiment, 27 tumor-bearing rats received saline or 1 mg/kg/day r-rGH for 2 weeks.
Tumor and host growth and host body composition were analyzed.
Results: Animals treated with r-rGH had significantly higher liver FSR than did controls (233 ± 27%/day vs. 110 ± 4%/day, respectively).
No significant differences were associated with growth hormone administration with respect to tumor growth, host composition,
or FSR of tumor or muscle.
Conclusions: Growth hormone stimulates liver protein synthesis, without changing tumor growth, protein synthesis, or host composition
in this rat sarcoma model. Further investigation of growth hormone as an anticachectic agent is warranted.
The results of this study were presented at the 46th Annual Cancer Symposium of The Society of Surgical Oncology, Los Angeles,
California, March 18–21, 1993. |
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Keywords: | Somatotropin Tumor Cachexia Metabolism Protein |
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