Cancer Chemotherapy and Pharmacology

, Volume 56, Issue 1, pp 97–104 | Cite as

Opioid growth factor enhances tumor growth inhibition and increases the survival of paclitaxel-treated mice with squamous cell carcinoma of the head and neck

  • Jeffrey R. Jaglowski
  • Ian S. Zagon
  • Brendan C. StackJr.
  • Michael F. Verderame
  • Alphonse E. Leure-duPree
  • Jeffrey D. Manning
  • Patricia J. McLaughlin
Original Article

Abstract

Paclitaxel is used as a single agent, and in combination with other drugs, as a standard of care in the treatment of squamous cell carcinoma of the head and neck (SCCHN). However, the use of paclitaxel for therapy of SCCHN may be accompanied by serious side effects. Paclitaxel is a known cytotoxic inhibitor of cell proliferation that acts by stabilizing microtubules and inducing apoptosis. Opioid growth factor (OGF), [Met5]-enkephalin, is an endogenous peptide that has tonically active inhibitory effects on the growth of SCCHN in vitro and in vivo. OGF action is rapid, reversible, mediated by the nuclear-associated OGF receptor (OGFr), and is not cytotoxic (nor apoptotic related). The present study was designed to examine whether a combination of chemotherapy with paclitaxel and biotherapy with OGF is more effective than either agent alone in inhibiting tumor growth. Moreover, focus was placed on whether there are changes in the side effects known to occur with paclitaxel alone, following this combined therapy. Human SCC-1 cells, derived from a well differentiated SCCHN, were transplanted into athymic mice. The mice were randomized to receive intraperitoneal (i.p.) injections of sterile saline (controls), OGF (10 mg/kg, daily), paclitaxel (8 mg/kg, every other day), or both paclitaxel (8 mg/kg, every other day) and OGF (10 mg/kg, daily) beginning on the day of tumor inoculation. OGF, but not paclitaxel, delayed measurable and visible tumor appearance of mice with SCCHN. Treatment with paclitaxel, but not with other agents, had a marked effect on the body weights. Survival only was reduced in the paclitaxel group, with an average life span of 34.3±3.1 days recorded, in comparison to the 50-day survival (date of termination) for all other groups. Beginning after week 4 of tumor inoculation and drug treatment, the tumor weight of the paclitaxel/OGF group was significantly reduced from the control, OGF, and paclitaxel-exposed mice. The OGFr number of the SCCHN tumors was 2.1-fold greater in the animals exposed to OGF or paclitaxel, and elevated 38% in the paclitaxel/OGF group; significant differences from the control group were found for the OGF and paclitaxel groups. These data suggest that combined chemotherapy (i.e., paclitaxel) and biotherapy (OGF) provides a valuable alternative to the standard of care for SCCHN patients.

Keywords

Opioid growth factor Opioid growth factor receptor Paclitaxel Chemoprotection Nude mice 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Jeffrey R. Jaglowski
    • 1
  • Ian S. Zagon
    • 1
  • Brendan C. StackJr.
    • 2
  • Michael F. Verderame
    • 3
  • Alphonse E. Leure-duPree
    • 1
  • Jeffrey D. Manning
    • 1
  • Patricia J. McLaughlin
    • 1
  1. 1.Department of Neural and Behavioral Sciences H109, The Milton S. Hershey Medical CenterPennsylvania State UniversityHersheyUSA
  2. 2.Department of Surgery, Division of Otolaryngology, The Milton S. Hershey Medical CenterPennsylvania State UniversityHersheyUSA
  3. 3.Department of Medicine, The Milton S. Hershey Medical CenterPennsylvania State UniversityHersheyUSA

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