In vitro and in vivo efficacy of 6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol (NBDHEX) on human melanoma.
6-(7-Nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol (NBDHEX) is a powerful inhibitor of the glutathione transferase P1-1 (GSTP1-1) and causes the disruption of the complex between GSTP1-1 and c-Jun N-terminal Kinase (JNK). This induces JNK activation and apoptosis in tumour cells. In the present work we assess the in vitro and in vivo effectiveness of NBDHEX on two human melanoma cell lines, Me501 and A375. NBDHEX shows IC(50) values in the low micromolar range (IC(50) of 1.2+/-0.1microM and 2.0+/-0.2 microM for Me501 and A375, respectively) and is over 100 times more cytotoxic to these cell lines than temozolomide. Apoptosis is observed in Me501 cells within 3h of the addition of NBDHEX, while in A375 cells the apoptotic event is rather late, and is preceded by a G2/M phase arrest. In both melanoma cell lines, JNK activity is required for the ability of NBDHEX to trigger apoptosis, confirming that the JNK pathway is an important therapeutic target for this tumour. NBDHEX is also both effective and well tolerated in in vivo tumour models. A tumour inhibition of 70% is observed in vivo against Me501 human melanoma and a similar result is obtained on A375 model, with 63% of tumour inhibition. These findings indicate that the activation of the JNK pathway, through a selective GSTP1-1 targeting, could prove to be a promising new strategy for treating melanoma, which responds poorly to conventional therapies.
Pellizzari Tregno
Francesca
F
Department of Chemical Sciences and Technologies, University of Tor Vergata, Rome, Italy.
Sau
Andrea
A
Pezzola
Silvia
S
Geroni
Cristina
C
Lapenta
Caterina
C
Spada
Massimo
M
Filomeni
Giuseppe
G
Bonanno
Elena
E
Federici
Giorgio
G
Caccuri
Anna Maria
AM
D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D017209:Apoptosis; D045744:Cell Line, Tumor; D004354:Drug Screening Assays, Antitumor / Q000379:methods; D051549:Glutathione S-Transferase pi / Q000037:antagonists & inhibitors*; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D008545:Melanoma / Q000188:drug therapy* / Q000378:metabolism; D051379:Mice; D016513:Mice, SCID; D008856:Microscopy, Fluorescence; D010069:Oxadiazoles / Q000627:therapeutic use*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
C528479:6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol; D000970:Antineoplastic Agents; D010069:Oxadiazoles; D051549:Glutathione S-Transferase pi; D048031:JNK Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases