Parthenolide induces caspase-independent cell death in osteosarcoma, melanoma and breast cancer cells through the induction of oxidative stress.

Risultato della ricerca: Other

Abstract

Parthenolide, a sesquiterpene lactone found in European feverfew, is used in traditional medicine for its anti-inflammatory activity. In addition, parthenolide has been considered as a novel and effective anti-tumor agent because it induces cytotoxic effects in several tumor cell lines.Our studies demonstrated that parthenolide exerted strong cytotoxic effects in osteosarcoma MG63 and melanoma SK-Mel28 cells in culture. Staining with Hoechst 33342 revealed in most cells after brief periods of treatments (3-5h) chromatin condensation and fragmentation, while only few cells were PI-positive. Prolonging the treatment (5-14h) PI-positive cells strongly augmented, denouncing the increase of necrotic effects. All these effects were prevented by NAC, while caspase inhibitors were ineffective, thus suggesting a caspase-independent cell death. The study of the mechanism of action provided evidence that treatment with parthenolide rapidly stimulated (1-2 h) ROS generation, in particular by inducing activation of extracellular signal-regulated kinase1/2 and NADPH oxidase. This event caused depletion of thiol groups and glutathione, NF-κB inhibition, JNK activation and cell detachment from the matrix. ROS generation together with mitochondrial accumulation of Ca2+favoured dissipation of Δψm, which appeared primarily determined by the opening of the permeability transition pore (PTP), since Δψm loss was partially prevented by cyclosporin A, an inhibitor of PTP opening. Recently, we focused our attention on MDA-MB231 cells, a very aggressive and poorly differentiated breast cancer cell line, which is negative for estrogen receptor alpha. Preliminary results suggested that parthenolide induced cell death in these cells with a mechanism similar to that demonstrated in osteosarcoma and melanoma cells. Interestingly, we demonstrated that in MDA-MB231 cells the effect of parthenolide was potentiated by the addition of z-VAD-fmk, a general inhibitor of caspases. Studies are in progress to elucidate the mechanism of this interaction which could suggest new strategies for the treatment of ER-α negative breast cancer.
Lingua originaleEnglish
Pagine188-
Numero di pagine1
Stato di pubblicazionePublished - 2012

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Osteosarcoma
Caspases
Melanoma
Oxidative Stress
Cell Death
Breast Neoplasms
Caspase Inhibitors
Permeability
Tanacetum parthenium
parthenolide
Estrogen Receptor alpha
Sesquiterpenes
NADPH Oxidase
Traditional Medicine
Lactones
Tumor Cell Line
Sulfhydryl Compounds
Cyclosporine
Chromatin
Glutathione

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title = "Parthenolide induces caspase-independent cell death in osteosarcoma, melanoma and breast cancer cells through the induction of oxidative stress.",
abstract = "Parthenolide, a sesquiterpene lactone found in European feverfew, is used in traditional medicine for its anti-inflammatory activity. In addition, parthenolide has been considered as a novel and effective anti-tumor agent because it induces cytotoxic effects in several tumor cell lines.Our studies demonstrated that parthenolide exerted strong cytotoxic effects in osteosarcoma MG63 and melanoma SK-Mel28 cells in culture. Staining with Hoechst 33342 revealed in most cells after brief periods of treatments (3-5h) chromatin condensation and fragmentation, while only few cells were PI-positive. Prolonging the treatment (5-14h) PI-positive cells strongly augmented, denouncing the increase of necrotic effects. All these effects were prevented by NAC, while caspase inhibitors were ineffective, thus suggesting a caspase-independent cell death. The study of the mechanism of action provided evidence that treatment with parthenolide rapidly stimulated (1-2 h) ROS generation, in particular by inducing activation of extracellular signal-regulated kinase1/2 and NADPH oxidase. This event caused depletion of thiol groups and glutathione, NF-κB inhibition, JNK activation and cell detachment from the matrix. ROS generation together with mitochondrial accumulation of Ca2+favoured dissipation of Δψm, which appeared primarily determined by the opening of the permeability transition pore (PTP), since Δψm loss was partially prevented by cyclosporin A, an inhibitor of PTP opening. Recently, we focused our attention on MDA-MB231 cells, a very aggressive and poorly differentiated breast cancer cell line, which is negative for estrogen receptor alpha. Preliminary results suggested that parthenolide induced cell death in these cells with a mechanism similar to that demonstrated in osteosarcoma and melanoma cells. Interestingly, we demonstrated that in MDA-MB231 cells the effect of parthenolide was potentiated by the addition of z-VAD-fmk, a general inhibitor of caspases. Studies are in progress to elucidate the mechanism of this interaction which could suggest new strategies for the treatment of ER-α negative breast cancer.",
author = "Renza Vento and Sonia Emanuele and Antonella D'Anneo and Roberta Martinez and Giovanni Tesoriere and Daniela Carlisi and Marianna Lauricella",
year = "2012",
language = "English",
pages = "188--",

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TY - CONF

T1 - Parthenolide induces caspase-independent cell death in osteosarcoma, melanoma and breast cancer cells through the induction of oxidative stress.

AU - Vento, Renza

AU - Emanuele, Sonia

AU - D'Anneo, Antonella

AU - Martinez, Roberta

AU - Tesoriere, Giovanni

AU - Carlisi, Daniela

AU - Lauricella, Marianna

PY - 2012

Y1 - 2012

N2 - Parthenolide, a sesquiterpene lactone found in European feverfew, is used in traditional medicine for its anti-inflammatory activity. In addition, parthenolide has been considered as a novel and effective anti-tumor agent because it induces cytotoxic effects in several tumor cell lines.Our studies demonstrated that parthenolide exerted strong cytotoxic effects in osteosarcoma MG63 and melanoma SK-Mel28 cells in culture. Staining with Hoechst 33342 revealed in most cells after brief periods of treatments (3-5h) chromatin condensation and fragmentation, while only few cells were PI-positive. Prolonging the treatment (5-14h) PI-positive cells strongly augmented, denouncing the increase of necrotic effects. All these effects were prevented by NAC, while caspase inhibitors were ineffective, thus suggesting a caspase-independent cell death. The study of the mechanism of action provided evidence that treatment with parthenolide rapidly stimulated (1-2 h) ROS generation, in particular by inducing activation of extracellular signal-regulated kinase1/2 and NADPH oxidase. This event caused depletion of thiol groups and glutathione, NF-κB inhibition, JNK activation and cell detachment from the matrix. ROS generation together with mitochondrial accumulation of Ca2+favoured dissipation of Δψm, which appeared primarily determined by the opening of the permeability transition pore (PTP), since Δψm loss was partially prevented by cyclosporin A, an inhibitor of PTP opening. Recently, we focused our attention on MDA-MB231 cells, a very aggressive and poorly differentiated breast cancer cell line, which is negative for estrogen receptor alpha. Preliminary results suggested that parthenolide induced cell death in these cells with a mechanism similar to that demonstrated in osteosarcoma and melanoma cells. Interestingly, we demonstrated that in MDA-MB231 cells the effect of parthenolide was potentiated by the addition of z-VAD-fmk, a general inhibitor of caspases. Studies are in progress to elucidate the mechanism of this interaction which could suggest new strategies for the treatment of ER-α negative breast cancer.

AB - Parthenolide, a sesquiterpene lactone found in European feverfew, is used in traditional medicine for its anti-inflammatory activity. In addition, parthenolide has been considered as a novel and effective anti-tumor agent because it induces cytotoxic effects in several tumor cell lines.Our studies demonstrated that parthenolide exerted strong cytotoxic effects in osteosarcoma MG63 and melanoma SK-Mel28 cells in culture. Staining with Hoechst 33342 revealed in most cells after brief periods of treatments (3-5h) chromatin condensation and fragmentation, while only few cells were PI-positive. Prolonging the treatment (5-14h) PI-positive cells strongly augmented, denouncing the increase of necrotic effects. All these effects were prevented by NAC, while caspase inhibitors were ineffective, thus suggesting a caspase-independent cell death. The study of the mechanism of action provided evidence that treatment with parthenolide rapidly stimulated (1-2 h) ROS generation, in particular by inducing activation of extracellular signal-regulated kinase1/2 and NADPH oxidase. This event caused depletion of thiol groups and glutathione, NF-κB inhibition, JNK activation and cell detachment from the matrix. ROS generation together with mitochondrial accumulation of Ca2+favoured dissipation of Δψm, which appeared primarily determined by the opening of the permeability transition pore (PTP), since Δψm loss was partially prevented by cyclosporin A, an inhibitor of PTP opening. Recently, we focused our attention on MDA-MB231 cells, a very aggressive and poorly differentiated breast cancer cell line, which is negative for estrogen receptor alpha. Preliminary results suggested that parthenolide induced cell death in these cells with a mechanism similar to that demonstrated in osteosarcoma and melanoma cells. Interestingly, we demonstrated that in MDA-MB231 cells the effect of parthenolide was potentiated by the addition of z-VAD-fmk, a general inhibitor of caspases. Studies are in progress to elucidate the mechanism of this interaction which could suggest new strategies for the treatment of ER-α negative breast cancer.

UR - http://hdl.handle.net/10447/73252

M3 - Other

SP - 188-

ER -