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Imiquimod upregulates the opioid growth factor receptor to inhibit cell proliferation independent of immune function.

Abstract
The imidazoquinoline compounds imiquimod and resiquimod are low-molecular-weight immune response modifiers that have potent anti-viral and anti-tumor properties. The mechanism by which they exert their effects remains unclear. Using pancreatic and colorectal cancer cells, as well as squamous carcinoma cells of the head and neck in tissue culture, which eliminated the immune system and toll-like receptors, we show that the imidazoquinolines upregulate the Opioid Growth Factor receptor (OGFr), which in turn stimulates the interaction of the OGF-OGFr axis. This native, tonically active inhibitory pathway regulates cell proliferation by modulating cyclin dependent kinase inhibitors, resulting in a retardation of cells at the G(1)-S interface of the cell cycle. Neutralization of OGF or knockdown of OGFr by siRNA technology eliminates the inhibitory effects of imidazoquinolines on cell replication. This exciting new knowledge of the mechanism of imidazoquinolines has important physiological relevance, and allows strategies to be developed for the use of these agents that will enhance effectiveness as well as attenuate side-effects.
AuthorsIan S Zagon, Renee N Donahue, Moshe Rogosnitzky, Patricia J McLaughlin
JournalExperimental biology and medicine (Maywood, N.J.) (Exp Biol Med (Maywood)) Vol. 233 Issue 8 Pg. 968-79 (Aug 2008) ISSN: 1535-3702 [Print] United States
PMID18480416 (Publication Type: Journal Article)
Chemical References
  • Aminoquinolines
  • Antineoplastic Agents
  • Narcotic Antagonists
  • RNA, Small Interfering
  • Receptors, Opioid
  • methionine-enkephalin receptor
  • imiquimod
Topics
  • Adenocarcinoma (drug therapy, genetics, metabolism, pathology)
  • Aminoquinolines (pharmacology)
  • Antineoplastic Agents (pharmacology)
  • Carcinoma, Squamous Cell (drug therapy, genetics, metabolism, pathology)
  • Cell Line, Tumor
  • Cell Proliferation (drug effects)
  • Colorectal Neoplasms (drug therapy, genetics, metabolism, pathology)
  • Head and Neck Neoplasms (drug therapy, genetics, metabolism, pathology)
  • Humans
  • Immunity (drug effects)
  • Narcotic Antagonists
  • Pancreatic Neoplasms (drug therapy, genetics, metabolism, pathology)
  • RNA, Small Interfering (genetics)
  • Receptors, Opioid (genetics, metabolism)
  • Up-Regulation (drug effects)

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