Rapamycin Suppresses Tumor Growth and Alters the Metabolic Phenotype in T-Cell Lymphoma

Wasakorn Kittipongdaja, Xuesong Wu, Justine Garner, Xiping Liu, Steven M. Komas, Samuel T Hwang, Stefan M. Schieke

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The mTOR pathway is a master regulator of cellular growth and metabolism. The biosynthetic and energetic demand of rapidly proliferating cells such as cancer cells is met by metabolic adaptations such as an increased glycolytic rate known as the Warburg effect. Herein, we characterize the anti-tumor effect of rapamycin in a mouse model of T-cell lymphoma and examine the metabolic effects in vitro. The murine T-cell lymphoma line, MBL2, and human cutaneous T-cell lymphoma (CTCL) lines, HH and Hut78, were used in syngeneic or standard NSG mouse models to demonstrate a marked suppression of tumor growth by rapamycin accompanied by inhibition of mTORC1/2. Analysis of the metabolic phenotype showed a substantial reduction in the glycolytic rate and glucose utilization in rapamycin-treated lymphoma cells. This was associated with reduced expression of glucose transporters and glycolytic enzymes in cultured cells and xenograft tumors. As a result of the decrease in glycolytic state, rapamycin-treated cells displayed reduced sensitivity to low-glucose conditions but continued to rely on mitochondrial oxidative phosphorylation (OXPHOS) with sensitivity to inhibition of OXPHOS. Taken together, we demonstrate that rapamycin suppresses growth of T-cell lymphoma tumors and leads to a reduction in aerobic glycolysis counteracting the Warburg effect of cancer cells.

Original languageEnglish (US)
Pages (from-to)2301-2308
Number of pages8
JournalJournal of Investigative Dermatology
Volume135
Issue number9
DOIs
StatePublished - Sep 18 2015
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology

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