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Thymoquinone inhibits proliferation, induces apoptosis and chemosensitizes human multiple myeloma cells through suppression of signal transducer and activator of transcription 3 activation pathway.
- Source :
- British Journal of Pharmacology; Oct2010, Vol. 161 Issue 3, p541-554, 14p
- Publication Year :
- 2010
-
Abstract
- <bold>Background and Purpose: </bold>Constitutive activation of the signal transducer and activator of transcription 3 (STAT3) pathway is frequently encountered in several human cancers including multiple myeloma (MM). Thus, agents that suppress STAT3 phosphorylation have a potential for treatment of MM. In the present report, we investigated whether thymoquinone (TQ), the main component isolated from the medicinal plant Nigella sativa, modulated the STAT3 signalling pathway in MM cells.<bold>Experimental Approach: </bold>The effect of TQ on both constitutive and IL-6-induced STAT3 activation, associated protein kinases, STAT3-regulated gene products involved in proliferation, survival and angiogenesis, cellular proliferation and apoptosis in MM cells, was investigated.<bold>Key Results: </bold>We found that TQ inhibited both constitutive and IL-6-inducible STAT3 phosphorylation which correlated with the inhibition of c-Src and JAK2 activation. Vanadate reversed the TQ-induced down-regulation of STAT3 activation, suggesting the involvement of a protein tyrosine phosphatase. Indeed, we found that TQ can induce the expression of Src homology-2 phosphatase 2 that correlated with suppression of STAT3 activation. TQ also down-regulated the expression of STAT3-regulated gene products, such as cyclin D1, Bcl-2, Bcl-xL, survivin, Mcl-1 and vascular endothelial growth factor. Finally, TQ induced the accumulation of cells in sub-G1 phase, inhibited proliferation and induced apoptosis, as indicated by poly ADP ribose polymerase cleavage. TQ also significantly potentiated the apoptotic effects of thalidomide and bortezomib in MM cells.<bold>Conclusions and Implications: </bold>Our study has identified STAT3 signalling as a target of TQ and has thus raised its potential application in the prevention and treatment of MM and other cancers. [ABSTRACT FROM AUTHOR]
- Subjects :
- QUINONE
CELL proliferation
APOPTOSIS
MULTIPLE myeloma
CELLULAR signal transduction
TRANSCRIPTION factors
PHOSPHORYLATION
BLACK cumin
NEOVASCULARIZATION
PROTEIN metabolism
ANTINEOPLASTIC agents
BIOCHEMISTRY
BORON compounds
CARRIER proteins
CELL lines
CELL physiology
COMPARATIVE studies
HETEROCYCLIC compounds
INTERLEUKINS
PHENOMENOLOGY
RESEARCH methodology
MEDICAL cooperation
PHOSPHATASES
RESEARCH
THALIDOMIDE
VANADATES
EVALUATION research
BENZOQUINONES
CHEMICAL inhibitors
PHARMACODYNAMICS
Subjects
Details
- Language :
- English
- ISSN :
- 00071188
- Volume :
- 161
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- British Journal of Pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 65012947
- Full Text :
- https://doi.org/10.1111/j.1476-5381.2010.00874.x