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[Apoptosis of K562 cells induced by nociceptin/orphanin FQ]

Hong Guo1, Li Zhao, Bao-Hong Zhang

  • 1Central Laboratory, The First Affiliated Hospital of Lanzhou University, Lanzhou 730000, China.

Zhongguo Shi Yan Xue Ye Xue Za Zhi
|January 6, 2007
PubMed

Insights

Nociceptin/orphanin FQ (OFQ) was found to inhibit K562 cell proliferation and induce apoptosis in vitro. OFQ demonstrated time-dependent inhibition and induced typical apoptosis characteristics, including DNA fragmentation.

Area of Science:

  • Pharmacology
  • Cell Biology
  • Cancer Research

Background:

  • The role of nociceptin/orphanin FQ (OFQ) in cellular processes, particularly in cancer cells, requires further investigation.
  • Understanding OFQ's effects on leukemia cell lines like K562 is crucial for potential therapeutic applications.

Purpose of the Study:

  • To investigate the effects of OFQ on the proliferation and apoptosis of K562 cells in an in vitro setting.
  • To determine the specific mechanisms by which OFQ influences K562 cell viability and death.

Main Methods:

  • Cell proliferation was assessed using the MTT assay.
  • Apoptosis was evaluated through morphological analysis (Wright staining, transmission electron microscopy), flow cytometry (FCM), and DNA fragmentation analysis (agarose gel electrophoresis).

Main Results:

  • OFQ exhibited time-dependent inhibition of K562 cell proliferation across a range of concentrations (10(-6) - 10(-13) mol/L).
  • OFQ treatment induced typical apoptotic features in K562 cells, including nuclear fragmentation and increased apoptosis rates (up to 26.5% at 10(-9) mol/L OFQ for 72 hours).
  • Cytolytic activity peaked at specific OFQ concentrations, suggesting a dose- and time-dependent cytotoxic effect.

Conclusions:

  • Nociceptin/orphanin FQ (OFQ) effectively inhibits K562 cell proliferation.
  • OFQ induces apoptosis in K562 cells, indicating its potential as an anti-cancer agent.

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