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The histone deacetylase inhibitor PCI-24781 as a putative radiosensitizer in pediatric glioblastoma cell lines.

de Andrade PV, Andrade AF, de Paula Queiroz RG, Scrideli CA, Tone LG, Valera ET - Cancer Cell Int. (2016)

Bottom Line: Cell proliferation rates, clonogenicity and apoptosis were compared in the presence and absence of treatment with PCI-24781.We also compared the clonogenicity rates of the irradiated SF188 and KNS42 cell lines with or without previous treatment with PCI-24781 at the doses of 0.25-16 μM.The inhibitor blocked cell proliferation, induced death by apoptosis and reduced the colony forming capacity of the cell lines, both of them showing a significant decrease of colony formation at all irradiation doses.

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatrics, Ribeirão Preto Medical School, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto-USP, University of São Paulo, 7º andar. Av. Bandeirantes, 3900, Bairro Monte Alegre, Ribeirão Preto, SP CEP 14048-900 Brazil.

ABSTRACT

Background: Glioblastoma (GBM) is considered to be one of the most aggressive tumors of the central nervous system (CNS). Even with the use of modern treatment protocols, the prognosis remains reserved, with children with GBM having a mean survival of 12-15 months.

Methods: In the present study we investigated the potential radiosensitizing effect of PCI-24781, a potent pan-histone deacetylase inhibitor (HDACi), on the SF188 and KNS42 cell lines of pediatric GBM. Cell proliferation rates, clonogenicity and apoptosis were compared in the presence and absence of treatment with PCI-24781. We also compared the clonogenicity rates of the irradiated SF188 and KNS42 cell lines with or without previous treatment with PCI-24781 at the doses of 0.25-16 μM. In addition, we investigated the effects of PCI-24781 on the expression of some of the main proteins responsible for the repair of double-strand DNA breaks caused by irradiation.

Results: The inhibitor blocked cell proliferation, induced death by apoptosis and reduced the colony forming capacity of the cell lines, both of them showing a significant decrease of colony formation at all irradiation doses. The expression of the Rad51 protein, important for the homologous recombination (HR) repair pathway, and of the DNA-PKcs, Ku70 and Ku86 proteins, important for the non-homologous end joining (NHEJ) repair pathway, was more reduced when the irradiated cell line was previously treated with PCI-24781 than when it was treated exclusively with radiotherapy.

Conclusions: These findings demonstrate that HDACi PCI-24781 has a radiosensitizing profile that compromises the repair of double-strand DNA breaks in cells of pediatric GBM treated with radiotherapy.

No MeSH data available.


Related in: MedlinePlus

Percentage of colonies after treatment with PCI-24781 in the SF188 and KNS42 lines. *p < 0.001 for treated cells compared to control
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Fig4: Percentage of colonies after treatment with PCI-24781 in the SF188 and KNS42 lines. *p < 0.001 for treated cells compared to control

Mentions: In order to determine whether the reduction of proliferation affected cell growth in the long term and to test the capacity of tumor renewal, the test of clonogenic capacity was performed at the 48 h time point at the doses of 0.25, 0.5, 1 and 2 µM on the pediatric GBM lines SF188 and KNS42. The analysis revealed that all doses induced a significant fall in colony formation compared to control (p < 0.001). The SF188 line exhibited a reduction of colony formation of almost 99 % and the KNS42 line was unable to form colonies at the maximum dose used (Fig. 4).Fig. 4


The histone deacetylase inhibitor PCI-24781 as a putative radiosensitizer in pediatric glioblastoma cell lines.

de Andrade PV, Andrade AF, de Paula Queiroz RG, Scrideli CA, Tone LG, Valera ET - Cancer Cell Int. (2016)

Percentage of colonies after treatment with PCI-24781 in the SF188 and KNS42 lines. *p < 0.001 for treated cells compared to control
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4835828&req=5

Fig4: Percentage of colonies after treatment with PCI-24781 in the SF188 and KNS42 lines. *p < 0.001 for treated cells compared to control
Mentions: In order to determine whether the reduction of proliferation affected cell growth in the long term and to test the capacity of tumor renewal, the test of clonogenic capacity was performed at the 48 h time point at the doses of 0.25, 0.5, 1 and 2 µM on the pediatric GBM lines SF188 and KNS42. The analysis revealed that all doses induced a significant fall in colony formation compared to control (p < 0.001). The SF188 line exhibited a reduction of colony formation of almost 99 % and the KNS42 line was unable to form colonies at the maximum dose used (Fig. 4).Fig. 4

Bottom Line: Cell proliferation rates, clonogenicity and apoptosis were compared in the presence and absence of treatment with PCI-24781.We also compared the clonogenicity rates of the irradiated SF188 and KNS42 cell lines with or without previous treatment with PCI-24781 at the doses of 0.25-16 μM.The inhibitor blocked cell proliferation, induced death by apoptosis and reduced the colony forming capacity of the cell lines, both of them showing a significant decrease of colony formation at all irradiation doses.

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatrics, Ribeirão Preto Medical School, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto-USP, University of São Paulo, 7º andar. Av. Bandeirantes, 3900, Bairro Monte Alegre, Ribeirão Preto, SP CEP 14048-900 Brazil.

ABSTRACT

Background: Glioblastoma (GBM) is considered to be one of the most aggressive tumors of the central nervous system (CNS). Even with the use of modern treatment protocols, the prognosis remains reserved, with children with GBM having a mean survival of 12-15 months.

Methods: In the present study we investigated the potential radiosensitizing effect of PCI-24781, a potent pan-histone deacetylase inhibitor (HDACi), on the SF188 and KNS42 cell lines of pediatric GBM. Cell proliferation rates, clonogenicity and apoptosis were compared in the presence and absence of treatment with PCI-24781. We also compared the clonogenicity rates of the irradiated SF188 and KNS42 cell lines with or without previous treatment with PCI-24781 at the doses of 0.25-16 μM. In addition, we investigated the effects of PCI-24781 on the expression of some of the main proteins responsible for the repair of double-strand DNA breaks caused by irradiation.

Results: The inhibitor blocked cell proliferation, induced death by apoptosis and reduced the colony forming capacity of the cell lines, both of them showing a significant decrease of colony formation at all irradiation doses. The expression of the Rad51 protein, important for the homologous recombination (HR) repair pathway, and of the DNA-PKcs, Ku70 and Ku86 proteins, important for the non-homologous end joining (NHEJ) repair pathway, was more reduced when the irradiated cell line was previously treated with PCI-24781 than when it was treated exclusively with radiotherapy.

Conclusions: These findings demonstrate that HDACi PCI-24781 has a radiosensitizing profile that compromises the repair of double-strand DNA breaks in cells of pediatric GBM treated with radiotherapy.

No MeSH data available.


Related in: MedlinePlus