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International Journal of Molecular Medicine
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Print ISSN: 1107-3756 Online ISSN: 1791-244X
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July-2015 Volume 36 Issue 1

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International Journal of Molecular Medicine

International Journal of Molecular Medicine

International Journal of Molecular Medicine is an international journal devoted to molecular mechanisms of human disease.

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International Journal of Oncology is an international journal devoted to oncology research and cancer treatment.

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Experimental and Therapeutic Medicine is an international journal devoted to laboratory and clinical medicine.

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Oncology Letters is an international journal devoted to Experimental and Clinical Oncology.

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Article

Mutations in the opioid growth factor receptor in human cancers alter receptor function

  • Authors:
    • Nancy P. Kren
    • Ian S. Zagon
    • Patricia J. McLaughlin
  • View Affiliations / Copyright

    Affiliations: Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
  • Pages: 289-293
    |
    Published online on: May 25, 2015
       https://doi.org/10.3892/ijmm.2015.2221
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Abstract

The opioid growth factor (OGF)-OGF receptor (OGFr) axis is present and tonically active in animal and human cancer cell lines and tumors. The OGF‑OGFr pathway tonically mediates cell replication in cancer, with OGF serving as an autocrine‑produced inhibitory pentapeptide. The inhibitory effect of OGF on cancer cell replication requires the binding of OGF to OGFr and its trafficking into the nucleus, where it upregulates inhibitory kinase expression, thus suppressing the cell cycle. OGF has been reported to markedly inhibit the growth of human cancer cells transplanted into nude mice, and to enhance the therapeutic effects of agents, such as paclitaxel and gemcitabine. At the time that this study commenced, there were 13 missense mutations identified in OGFr that had been curated in the Catalogue of Somatic Mutations in Cancer (COSMIC) database. Little is known about any mutations identified in OGFr or how mutated OGFr may alter the inhibitory activity of OGF. In this study, two mutations identified in cancer samples, S378I and R444H, were characterized with respect to how they modified OGFr trafficking into the nucleus and changed the functional attributes of DNA synthesis. R444H demonstrated a significant decrease in the nuclear/cytoplasmic ratio, while S378I showed no change. Both mutations demonstrated a loss of response to OGF and the long‑acting opioid antagonist, naltrexone (NTX), while only R444H showed a loss of inhibition in the 5‑bromo‑2'‑deoxyuridine (BrdU) assay. These data demonstrate that an intact OGFr is required for a full response to biotherapy with OGF, and that it is important to characterize potential mutations in neoplasia which could affect therapeutic responsiveness.
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Copy and paste a formatted citation
Spandidos Publications style
Kren NP, Zagon IS and McLaughlin PJ: Mutations in the opioid growth factor receptor in human cancers alter receptor function. Int J Mol Med 36: 289-293, 2015.
APA
Kren, N.P., Zagon, I.S., & McLaughlin, P.J. (2015). Mutations in the opioid growth factor receptor in human cancers alter receptor function. International Journal of Molecular Medicine, 36, 289-293. https://doi.org/10.3892/ijmm.2015.2221
MLA
Kren, N. P., Zagon, I. S., McLaughlin, P. J."Mutations in the opioid growth factor receptor in human cancers alter receptor function". International Journal of Molecular Medicine 36.1 (2015): 289-293.
Chicago
Kren, N. P., Zagon, I. S., McLaughlin, P. J."Mutations in the opioid growth factor receptor in human cancers alter receptor function". International Journal of Molecular Medicine 36, no. 1 (2015): 289-293. https://doi.org/10.3892/ijmm.2015.2221
Copy and paste a formatted citation
x
Spandidos Publications style
Kren NP, Zagon IS and McLaughlin PJ: Mutations in the opioid growth factor receptor in human cancers alter receptor function. Int J Mol Med 36: 289-293, 2015.
APA
Kren, N.P., Zagon, I.S., & McLaughlin, P.J. (2015). Mutations in the opioid growth factor receptor in human cancers alter receptor function. International Journal of Molecular Medicine, 36, 289-293. https://doi.org/10.3892/ijmm.2015.2221
MLA
Kren, N. P., Zagon, I. S., McLaughlin, P. J."Mutations in the opioid growth factor receptor in human cancers alter receptor function". International Journal of Molecular Medicine 36.1 (2015): 289-293.
Chicago
Kren, N. P., Zagon, I. S., McLaughlin, P. J."Mutations in the opioid growth factor receptor in human cancers alter receptor function". International Journal of Molecular Medicine 36, no. 1 (2015): 289-293. https://doi.org/10.3892/ijmm.2015.2221
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