Synergistic interaction of hyperthermia and gemcitabine in lung cancer

Roger A. Vertrees, Gokul C. Das, Vsevolod Popov, Angela M. Coscio, Thomas J. Goodwin, Roberto Logrono, Joseph B. Zwischenberger, Paul J. Boor

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Hyperthermia increases cytotoxicity of various antineoplastic agents. We investigated the cytotoxic effects of Gemcitabine and/or hyperthermia on BZR-T33 (human non-small-cell lung cancer cells) in vitro and in immune-suppressed athymic nude mice. Isobologram analysis of monolayer cell cultures for cytotoxicity demonstrates a synergistic interaction between hyperthermia and Gemcitabine. Clonogenic results show significant reductions in surviving fractions and colony size for both therapies; greatest reduction was for the combined therapy group. Using cell cycle analysis, hyperthermia enhanced Gemcitabine-induced G2-M arrest resulting in destruction of 3.5 log cells. Apoptotic studies (Annexin-V FITC staining) showed that hyperthermia augmented Gemcitabine-induced apoptosis. Transmission electron microscopy demonstrated pathology observed in cultures exposed to either therapy present in cultures exposed to both therapies. Studies in nude mice show that the combination therapy group had both an initial decrease in tumor size, and a significantly delayed rate of growth. Additionally, using tumor material harvested from nude mice two days after end to treatment reveals a significantly greater apoptotic index and significantly smaller mitotic index for the combined therapy group. Western blots of the same tumor material, showed that heat shock protein 70 was not significantly increased, however, caspase-3 activity of was significantly increased because of the combined therapy. In conclusion, the combined therapy is synergistic in effect because of hyperthermia enhancing Gemcitabine-induced apoptosis.

Original languageEnglish (US)
Pages (from-to)1144-1153
Number of pages10
JournalCancer Biology and Therapy
Volume4
Issue number10
StatePublished - Oct 2005

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gemcitabine
Lung Neoplasms
Fever
Nude Mice
Group Psychotherapy
Apoptosis
Therapeutics
Neoplasms
Mitotic Index
HSP70 Heat-Shock Proteins
Fluorescein-5-isothiocyanate
Annexin A5
Transmission Electron Microscopy
Non-Small Cell Lung Carcinoma
Caspase 3
Antineoplastic Agents
Cell Cycle
Cell Culture Techniques
Western Blotting
Pathology

Keywords

  • Apoptosis
  • Caspase-3
  • Gemcitabine
  • Hyperthermia
  • Lung cancer
  • Synergistic

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Vertrees, R. A., Das, G. C., Popov, V., Coscio, A. M., Goodwin, T. J., Logrono, R., ... Boor, P. J. (2005). Synergistic interaction of hyperthermia and gemcitabine in lung cancer. Cancer Biology and Therapy, 4(10), 1144-1153.

Synergistic interaction of hyperthermia and gemcitabine in lung cancer. / Vertrees, Roger A.; Das, Gokul C.; Popov, Vsevolod; Coscio, Angela M.; Goodwin, Thomas J.; Logrono, Roberto; Zwischenberger, Joseph B.; Boor, Paul J.

In: Cancer Biology and Therapy, Vol. 4, No. 10, 10.2005, p. 1144-1153.

Research output: Contribution to journalArticle

Vertrees, RA, Das, GC, Popov, V, Coscio, AM, Goodwin, TJ, Logrono, R, Zwischenberger, JB & Boor, PJ 2005, 'Synergistic interaction of hyperthermia and gemcitabine in lung cancer', Cancer Biology and Therapy, vol. 4, no. 10, pp. 1144-1153.
Vertrees RA, Das GC, Popov V, Coscio AM, Goodwin TJ, Logrono R et al. Synergistic interaction of hyperthermia and gemcitabine in lung cancer. Cancer Biology and Therapy. 2005 Oct;4(10):1144-1153.
Vertrees, Roger A. ; Das, Gokul C. ; Popov, Vsevolod ; Coscio, Angela M. ; Goodwin, Thomas J. ; Logrono, Roberto ; Zwischenberger, Joseph B. ; Boor, Paul J. / Synergistic interaction of hyperthermia and gemcitabine in lung cancer. In: Cancer Biology and Therapy. 2005 ; Vol. 4, No. 10. pp. 1144-1153.
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