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Tumor Biology

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01.12.2012 | Research Article

Synergistic induction of apoptosis and chemosensitization of human colorectal cancer cells by histone deacetylase inhibitor, scriptaid, and proteasome inhibitors: potential mechanisms of action

verfasst von: M. S. I. Abaza, A. M. Bahman, R. J. Al-Attiyah, A. M. Kollamparambil

Erschienen in: Tumor Biology | Ausgabe 6/2012

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Abstract

Histone deacetylase inhibitors (HDACIs) exhibit modest results as single agents in preclinical and clinical studies against solid tumors; they often fall short and activate nuclear factor kappa-B (NFκB). Co-administration of HDACI with proteasome inhibitors (PIs), which interrupt NFκB pathways, may enhance HDACI-lethality. The goal of this study was to determine whether PIs could potentiate HDACI, scriptaid (SCP)-mediated lethality, to unravel the associated mechanisms and to assess the effects of the combined inhibition of HDAC and proteasome on chemotherapy response in human colorectal cancer cells. Cancer cells were exposed to agents alone or in combination; cell growth inhibition was determined by MTT and colony formation assays. HDAC-, proteasome-, NFκB-activities, and reactive oxygen species (ROS) were quantified. Induction of apoptosis and cell cycle alterations were monitored by flow cytometry. Expression of cell cycle/apoptosis and cytoprotective/stress-related genes was determined by real-time qRT-PCR and EIA, respectively. Potentiation of cancer cell sensitivity to chemotherapies by SCP/PIs was also evaluated. SCP and PIs: MG132, PI-1, or epoxomicin interact synergistically to potently inhibit cancer cell growth, alter cell cycle, induce apoptosis, reduce NFκB activity, and increase ROS generation. These events are associated with multiple perturbations in the expression of cell cycle, apoptosis, cytoprotective, and stress-related genes. Co-administration of SCP and PIs strikingly increases the chemosensitivity of cancer cells (122–2 × 10⁵-fold) in a drug and SCP/PIs-dependent manner. This combination regimen markedly reduced the doses of chemotherapies with potent anticancer effects and less toxicity. A strategy combining HDAC/proteasome inhibition with chemotherapies warrants further investigation in colorectal cancer.

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Titel: Synergistic induction of apoptosis and chemosensitization of human colorectal cancer cells by histone deacetylase inhibitor, scriptaid, and proteasome inhibitors: potential mechanisms of action
verfasst von: M. S. I. Abaza
A. M. Bahman
R. J. Al-Attiyah
A. M. Kollamparambil
Publikationsdatum: 01.12.2012
Verlag: Springer Netherlands
Erschienen in: Tumor Biology / Ausgabe 6/2012
Print ISSN: 1010-4283
Elektronische ISSN: 1423-0380
DOI: https://doi.org/10.1007/s13277-012-0456-6

Springer Medizin

Synergistic induction of apoptosis and chemosensitization of human colorectal cancer cells by histone deacetylase inhibitor, scriptaid, and proteasome inhibitors: potential mechanisms of action

Abstract

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Springer Medizin

Abstract

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