Combination of a rapamycin analog (CCI-779) and interferon-gamma is more effective than single agents in treating a mouse model of tuberous sclerosis complex.

Abstract

Tuberous sclerosis complex (TSC) is a familial tumor syndrome characterized by the development of hamartomas in the brain, heart, kidney, and skin. Disease-causing mutations in the TSC1 or TSC2 gene result in constitutive activation of the highly conserved mTOR signal transduction pathway, which regulates cell growth, proliferation, and metabolism. The mTOR inhibitor, rapamycin (sirolimus), reduces disease severity in rodent models of TSC, and is currently in phase II clinical trials. The cytokine interferon-gamma (IFN-gamma) is another potential therapeutic agent for TSC. A high-expressing IFN-gamma allele is associated with a lower frequency of kidney tumors in TSC patients, and treatment with exogenous IFN-gamma reduces the severity of TSC-related disease in mouse models. Here, we examine the effects of treating tumor-bearing nude mice with a combination of a rapamycin analog (CCI-779) and IFN-gamma. We observed that combination therapy was more effective than single agent therapy in reducing tumor growth and improving survival in this mouse model of TSC. Immunoblot and immunohistochemical analyses showed that tumors treated with CCI-779 plus IFN-gamma had decreased cell proliferation and increased cell death in comparison with untreated tumors or tumors treated with either agent alone. We also observed that CCI-779 resistance could develop with prolonged treatment. Taken together, our results show that targeting multiple cellular pathways is an effective strategy for treating TSC-related tumors, and underscore the importance of investigating combination therapy in future clinical trials for patients with TSC.

• Authors: Laifong Lee, Paul Sudentas, Sandra L Dabora
• Journal: Genes, chromosomes & cancer (Genes Chromosomes Cancer) Vol. 45 Issue 10 Pg. 933-44 (Oct 2006) ISSN: 1045-2257 [Print] United States
• PMID: 16845661 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: (c) 2006 Wiley-Liss, Inc.

Chemical References

• Tsc2 protein, mouse
• Tuberous Sclerosis Complex 2 Protein
• Tumor Suppressor Proteins
• temsirolimus
• Interferon-gamma
• Sirolimus

Topics

• Animals
• Antineoplastic Combined Chemotherapy Protocols (therapeutic use)
• Disease Models, Animal
• Drug Therapy, Combination
• Interferon-gamma (administration & dosage)
• Mice
• Mice, Knockout
• Mice, Nude
• Signal Transduction
• Sirolimus (administration & dosage, analogs & derivatives)
• Survival Rate
• Tuberous Sclerosis (drug therapy, metabolism, pathology)
• Tuberous Sclerosis Complex 2 Protein
• Tumor Suppressor Proteins (genetics, physiology)