Tumor Biology

, Volume 33, Issue 5, pp 1505–1510 | Cite as

RETRACTED ARTICLE: A translocator protein ligand PK11195 shows antigrowth activity in human choriocarcinoma cells

  • Noriyuki TakaiEmail author
  • Naoko Kira
  • Terukazu Ishii
  • Toshie Yoshida
  • Masakazu Nishida
  • Yoshihiro Nishida
  • Kaei Nasu
  • Masayuki Takano
  • Haruna Midori
  • Satoko Koga
  • Hisashi Narahara
Research Article


The potential anticancer agent 1-(2-chlorophenyl-N-methylpropyl)-3-isoquinolinecarboxamide (PK11195), a translocator protein ligand (initially described as a ligand for the peripheral benzodiazepine receptor), induces apoptosis in some lines of human tumor cells. We investigated the effect of PK11195 in the choriocarcinoma cell line, BeWo. BeWo cells were treated with various concentrations of PK11195, and changes in cell growth, the cell cycle, apoptosis, and related parameters were examined. A WST-1 assay showed that BeWo cells were sensitive to the growth inhibitory effect of PK11195. In contrast, the nonsite selective ligand diazepam has a little effect on these cells. Cell cycle analysis indicated that exposure to PK11195 decreased the proportion of cells in the S phase and increased the proportion in the G0/G1 phases of the cell cycle. Induction of apoptosis was confirmed by Annexin V staining of externalized phosphatidylserine, by the loss of mitochondrial transmembrane potential, and by antibodies directed against histones from fragmented DNA. This induction occurred in conjunction with the altered expression of genes related to cell growth, malignant phenotype, and apoptosis. These results suggest that PK11195 may serve as a therapeutic agent for the treatment of choriocarcinoma.


Translocator protein ligand PK11195 Cell cycle Apoptosis Choriocarcinoma 



This study was supported by a Grant-in-Aid (No. 21592139 to NT) for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology, Japan and by a Research Fund at the Discretion of the President, Oita University (HN).

Conflicts of interest



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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2012

Authors and Affiliations

  • Noriyuki Takai
    • 1
    Email author
  • Naoko Kira
    • 1
  • Terukazu Ishii
    • 1
  • Toshie Yoshida
    • 1
  • Masakazu Nishida
    • 1
  • Yoshihiro Nishida
    • 1
  • Kaei Nasu
    • 1
  • Masayuki Takano
    • 1
  • Haruna Midori
    • 1
  • Satoko Koga
    • 1
  • Hisashi Narahara
    • 1
  1. 1.Department of Obstetrics and Gynecology, Faculty of MedicineOita UniversityYufu-shiJapan

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