Abstract
Low delivery of many anticancer drugs across the blood–brain barrier (BBB) is a limitation to the success of chemotherapy in glioblastoma. This is because of the high levels of ATP-binding cassette transporters like P-glycoprotein (Pgp/ABCB1), which effluxes drugs back to the bloodstream. Temozolomide is one of the few agents able to cross the BBB; its effects on BBB cells permeability and Pgp activity are not known. We found that temozolomide, at therapeutic concentration, increased the transport of Pgp substrates across human brain microvascular endothelial cells and decreased the expression of Pgp. By methylating the promoter of Wnt3 gene, temozolomide lowers the endogenous synthesis of Wnt3 in BBB cells, disrupts the Wnt3/glycogen synthase kinase 3/β-catenin signaling, and reduces the binding of β-catenin on the promoter of mdr1 gene, which encodes for Pgp. In co-culture models of BBB cells and human glioblastoma cells, pre-treatment with temozolomide increases the delivery, cytotoxicity, and antiproliferative effects of doxorubicin, vinblastine, and topotecan, three substrates of Pgp that are usually poorly delivered across BBB. Our work suggests that temozolomide increases the BBB permeability of drugs that are normally effluxed by Pgp back to the bloodstream. These findings may pave the way to new combinatorial chemotherapy schemes in glioblastoma.
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Abbreviations
- GBM:
-
Glioblastoma multiforme
- CNS:
-
Central nervous system
- BBB:
-
Blood–brain barrier
- TMZ:
-
Temozolomide
- ABC:
-
ATP-binding cassette
- BAT:
-
Brain-adjacent to tumor
- Pgp:
-
P-glycoprotein
- MRP:
-
Multidrug resistance-related protein
- BCRP:
-
Breast cancer resistance protein
- LRP:
-
Low-density lipoprotein receptor-related protein
- GSK3:
-
Glycogen synthase kinase 3
- TCF/lEF:
-
T cell factor/lymphoid enhancer factor
- Dkk-1:
-
Dickkopf-1
- HBMECs:
-
Human brain microvascular endothelial cells
- FCS:
-
Fetal calf serum
- BSA:
-
Bovine serum albumin
- FITC:
-
Fluorescein isothiocyanate
- ZO-1:
-
Zonula occludens-1
- TBP:
-
TATA-box binding protein
- qRT-PCR:
-
Quantitative real-time PCR
- ChIP:
-
Chromatin immunoprecipitation
- MSP:
-
Methylation-specific PCR
- DAPI:
-
4′,6-Diamidino-2-phenylindole dihydrochloride
- LDH:
-
Lactate dehydrogenase
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Acknowledgments
We are indebted to Prof. Michele Lanotte (Department of Neuroscience, Neurosurgical Unit, University of Turin) and to Dr. Rossella Galli (San Raffaele Scientific Institute, Milan) for providing the primary glioblastoma samples. We are grateful to Costanzo Costamagna (Department of Oncology, University of Turin) for the technical assistance and to Dr. Oriana Monzeglio (Neuro-bio-oncology Center, Policlinico di Monza Foundation) for the technical suggestions with methylation promoter assay. This work has been supported by grants from Compagnia di San Paolo, Italy (Neuroscience Program; grant 2008.1136) and Italian Association for Cancer Research (AIRC; MFAG 11475) to Chiara Riganti. Martha Leonor Pinzón-Daza is recipient of a ERACOL Erasmus Mundus fellowship. Joanna Kopecka is recipient of a “Mario and Valeria Rindi” fellowship provided by Italian Foundation for Cancer Research (FIRC).
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Riganti, C., Salaroglio, I.C., Pinzòn-Daza, M.L. et al. Temozolomide down-regulates P-glycoprotein in human blood–brain barrier cells by disrupting Wnt3 signaling. Cell. Mol. Life Sci. 71, 499–516 (2014). https://doi.org/10.1007/s00018-013-1397-y
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DOI: https://doi.org/10.1007/s00018-013-1397-y