Phytotherapeutics oridonin and ponicidin show additive effects combined with irradiation in pancreatic cancer in vitro
Background: Chemoradiation of locally advanced non-metastatic pancreatic cancer can lead to secondary operability by tumor mass reduction. Here, we analyzed radiomodulating effects of oridonin and ponicidin in pancreatic cancer in vitro. Both agents are ent-kaurane diterpenoids, extracted from Isodo...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2017 Nov 29
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| In: |
Radiology and oncology
Year: 2017, Jahrgang: 51, Heft: 4, Pages: 407-414 |
| ISSN: | 1581-3207 |
| DOI: | 10.1515/raon-2017-0048 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1515/raon-2017-0048 Verlag, kostenfrei, Volltext: https://www.degruyterbrill.com/view/j/raon.2017.51.issue-4/raon-2017-0048/raon-2017-0048.xml 
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| Verfasserangaben: | Jakob Liermann, Patrick Naumann, Franco Fortunato, Thomas E. Schmid, Klaus-Josef Weber, Jürgen Debus, Stephanie E. Combs |
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| 520 | |a Background: Chemoradiation of locally advanced non-metastatic pancreatic cancer can lead to secondary operability by tumor mass reduction. Here, we analyzed radiomodulating effects of oridonin and ponicidin in pancreatic cancer in vitro. Both agents are ent-kaurane diterpenoids, extracted from Isodon rubescens, a plant that is well known in Traditional Chinese Medicine. Cytotoxic effects have recently been shown in different tumor entities for both agents. Materials and methods: Pancreatic cancer cell lines AsPC-1, BxPC-3, Panc-1 and MIA PaCa-2 were pretreated with oridonin or ponicidin and irradiated with 2 Gy to 6 Gy. Long-term survival was determined by clonogenic assay. Cell cycle effects and intensity of γH2AX as indicator for DNA double-strand breaks were investigated by flow cytometry. Western blotting was used to study the DNA double-strand break repair proteins Ku70, Ku80 and XRCC4. Results: Oridonin and ponicidin lead to a dose-dependent reduction of clonogenic survival and an increase in γH2AX. Combined with irradiation we observed additive effects and a prolonged G2/M-arrest. No relevant changes in the levels of the DNA double-strand break repair proteins were detected. Conclusions: Pretreatment with oridonin or ponicidin followed by irradiation lead to an additional reduction in survival of pancreatic cancer cells in vitro, presumably explained by an induced prolonged G2/M-arrest. Both agents seem to induce DNA double-strand breaks but do not interact with the non-homologous end joining (NHEJ) pathway. | ||
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