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In comparative analysis of multi-kinase inhibitors for targeted medulloblastoma therapy pazopanib exhibits promising in vitro and in vivo efficacy.

Craveiro RB, Ehrhardt M, Holst MI, Pietsch T, Dilloo D - Oncotarget (2014)

Bottom Line: Pazopanib reduced the growth rate of intracranial growing medulloblastoma and significantly prolonged the survival.Furthermore, to put these results into a broader perspective we analysed Pazopanib side by side with the MKI Sorafenib.Thus, we identified Pazopanib as a new promising candidate for a rational clinical assessment for targeted paediatric medulloblastoma therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatric Hematology and Oncology, Center for Pediatrics, University of Bonn Medical Center, Bonn, Germany. These authors contributed equally to this work.

ABSTRACT
Regardless of the recent advances in cytotoxic therapies, 30% of children diagnosed with medulloblastoma. succumb to the disease. Therefore, novel therapeutic approaches are warranted. Here we demonstrate that Pazopanib a clinically approved multi-kinase angiogenesis inhibitor (MKI) inhibits proliferation and apoptosis in medulloblastoma cell lines. Moreover, Pazopanib profoundly attenuates medulloblastoma cell migration, a prerequisite for tumor invasion and metastasis. In keeping with the observed anti-neoplastic activity of Pazopanib, we also delineate reduced phosphorylation of the STAT3 protein, a key regulator of medulloblastoma proliferation and cell survival. Finally, we document profound in vivo activity of Pazopanib in an orthotopic mouse model of the most aggressive c-myc amplified human medulloblastoma variant. Pazopanib reduced the growth rate of intracranial growing medulloblastoma and significantly prolonged the survival. Furthermore, to put these results into a broader perspective we analysed Pazopanib side by side with the MKI Sorafenib. Both compounds share a similar target profile but display different pharmacodynamics and pharmacokinetics with distinct cytotoxic activity in different tumor entities. Thus, we identified Pazopanib as a new promising candidate for a rational clinical assessment for targeted paediatric medulloblastoma therapy.

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Pazopanib and Sorafenib inhibit medulloblastoma cell migrationAfter a single scratch was made in a confluent monolayer of Daoy cells, these were exposed to Pazopanib and Sorafenib at concentrations corresponding to patient plasma levels (Pazopanib 15 μM and Sorafenib 10 μM) for 24h. Each scratch was photographed after 12 and 24h and its width determined. Statistically significant differences from control are marked by an asterisk (*p<0,05). The data shown represent four independent experiments.
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Figure 6: Pazopanib and Sorafenib inhibit medulloblastoma cell migrationAfter a single scratch was made in a confluent monolayer of Daoy cells, these were exposed to Pazopanib and Sorafenib at concentrations corresponding to patient plasma levels (Pazopanib 15 μM and Sorafenib 10 μM) for 24h. Each scratch was photographed after 12 and 24h and its width determined. Statistically significant differences from control are marked by an asterisk (*p<0,05). The data shown represent four independent experiments.

Mentions: In migration assays we determined the potential of Pazopanib and Sorafenib to inhibit medulloblastoma cell migration, a prerequisite for invasion and metastasis (Figure 6a and 6b). We chose the medulloblastoma cell line Daoy based on its known migratory properties. At concentrations comparable to those observed in patient plasma, Pazopanib and Sorafenib significantly inhibited cell migration in a scratch wound assay in comparison to the vehicle DMSO employed for control. (Migration at 24h: Pazopanib 271 ± 56 μm; Sorafenib 269 ± 37μm and DMSO 584 ± 36 μm) [21-22].


In comparative analysis of multi-kinase inhibitors for targeted medulloblastoma therapy pazopanib exhibits promising in vitro and in vivo efficacy.

Craveiro RB, Ehrhardt M, Holst MI, Pietsch T, Dilloo D - Oncotarget (2014)

Pazopanib and Sorafenib inhibit medulloblastoma cell migrationAfter a single scratch was made in a confluent monolayer of Daoy cells, these were exposed to Pazopanib and Sorafenib at concentrations corresponding to patient plasma levels (Pazopanib 15 μM and Sorafenib 10 μM) for 24h. Each scratch was photographed after 12 and 24h and its width determined. Statistically significant differences from control are marked by an asterisk (*p<0,05). The data shown represent four independent experiments.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4196191&req=5

Figure 6: Pazopanib and Sorafenib inhibit medulloblastoma cell migrationAfter a single scratch was made in a confluent monolayer of Daoy cells, these were exposed to Pazopanib and Sorafenib at concentrations corresponding to patient plasma levels (Pazopanib 15 μM and Sorafenib 10 μM) for 24h. Each scratch was photographed after 12 and 24h and its width determined. Statistically significant differences from control are marked by an asterisk (*p<0,05). The data shown represent four independent experiments.
Mentions: In migration assays we determined the potential of Pazopanib and Sorafenib to inhibit medulloblastoma cell migration, a prerequisite for invasion and metastasis (Figure 6a and 6b). We chose the medulloblastoma cell line Daoy based on its known migratory properties. At concentrations comparable to those observed in patient plasma, Pazopanib and Sorafenib significantly inhibited cell migration in a scratch wound assay in comparison to the vehicle DMSO employed for control. (Migration at 24h: Pazopanib 271 ± 56 μm; Sorafenib 269 ± 37μm and DMSO 584 ± 36 μm) [21-22].

Bottom Line: Pazopanib reduced the growth rate of intracranial growing medulloblastoma and significantly prolonged the survival.Furthermore, to put these results into a broader perspective we analysed Pazopanib side by side with the MKI Sorafenib.Thus, we identified Pazopanib as a new promising candidate for a rational clinical assessment for targeted paediatric medulloblastoma therapy.

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatric Hematology and Oncology, Center for Pediatrics, University of Bonn Medical Center, Bonn, Germany. These authors contributed equally to this work.

ABSTRACT
Regardless of the recent advances in cytotoxic therapies, 30% of children diagnosed with medulloblastoma. succumb to the disease. Therefore, novel therapeutic approaches are warranted. Here we demonstrate that Pazopanib a clinically approved multi-kinase angiogenesis inhibitor (MKI) inhibits proliferation and apoptosis in medulloblastoma cell lines. Moreover, Pazopanib profoundly attenuates medulloblastoma cell migration, a prerequisite for tumor invasion and metastasis. In keeping with the observed anti-neoplastic activity of Pazopanib, we also delineate reduced phosphorylation of the STAT3 protein, a key regulator of medulloblastoma proliferation and cell survival. Finally, we document profound in vivo activity of Pazopanib in an orthotopic mouse model of the most aggressive c-myc amplified human medulloblastoma variant. Pazopanib reduced the growth rate of intracranial growing medulloblastoma and significantly prolonged the survival. Furthermore, to put these results into a broader perspective we analysed Pazopanib side by side with the MKI Sorafenib. Both compounds share a similar target profile but display different pharmacodynamics and pharmacokinetics with distinct cytotoxic activity in different tumor entities. Thus, we identified Pazopanib as a new promising candidate for a rational clinical assessment for targeted paediatric medulloblastoma therapy.

Show MeSH
Related in: MedlinePlus