Abstract
Intracellular pH (pHi) plays an important role in the maintenance of normal cell function, and is maintained within a narrow range by the activity of transporters located at the plasma membrane. Modulation of tumor pHi may influence proliferation, apoptosis, chemotherapy resistance, and thermosensitivity. Chemical exchange saturation transfer (CEST) is a novel MRI contrast mechanism that is dependent on cellular pH. Amine and amide concentration-independent detection (AACID) is a recently developed CEST contrast method that is intracellular pH (pHi) weighted. Dichloroacetate (DCA) can alter tumor pHi by inhibiting the enzyme pyruvate dehydrogenase kinase causing reduced lactate (increasing pHi), or by decreasing the expression of monocarboxylate transporters and vacuolar ATPase leading to reduced pHi. Since the net in vivo effect of DCA on pHi is difficult to predict, the purpose of this study was to quantify the magnitude of acute pHi change in glioblastoma after a single DCA injection using AACID CEST MRI. Using a 9.4T MRI scanner, CEST spectra were acquired in six mice approximately 14 days after implanting 105 U87 human glioblastoma multiforme (GBM) cells in the brain, before and after intravenous injection of DCA (dose: 200 mg/kg). Three additional mice received only phosphate buffered saline (PBS) injection and were studied as controls. Repeated measures t test was used to compare AACID changes in tumor and contralateral tissue regions of interest. One hour after DCA injection there was a significant increase in tumor AACID level by 0.04 ± 0.01 corresponding to a 0.16 decrease in pHi, and no change in AACID in contralateral tissue. Inspection of AACID maps following PBS injection showed no differences. The use of DCA to induce a tumor specific pH change detectable by AACID CEST MRI is consistent with previous studies that have shown similar effects for lonidamine and topiramate. This study demonstrates that a single dose of DCA can be used as a pharmacological challenge to induced rapid tumor intracellular acidification.
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Abbreviations
- GBM:
-
Glioblastoma multiforme
- pHi :
-
Intracellular pH
- pHe :
-
Extracellular pH
- PDH:
-
Pyruvate dehydrogenase
- PDK:
-
Pyruvate dehydrogenase kinase
- V-ATPase:
-
Vacuolar-type H+-ATPase
- PBS:
-
Phosphate buffered saline
- CEST:
-
Chemical exchange saturation transfer
- DCA:
-
Dichloroacetate
- RF:
-
Radiofrequency
- MTRasym :
-
Asymmetric magnetization transfer ratio
- MT:
-
Magnetization transfer
- AACID:
-
Amine and amide concentration-independent detection
- FSE:
-
Fast spin-echo
- WASSR:
-
Water saturation shift referencing
- ROI:
-
Region of interest
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Acknowledgements
Funding for this study was provided by the Ontario Institute of Cancer Research (OICR) Smarter Imaging Program (Grant Number 00807) with support from Brain Canada. The authors wish to thank Miranda Bellyou for assistance with animal preparation and handling. Thanks to Misan University-Ministry of Higher Education and Scientific Research, Iraq.
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All applicable national and institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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Albatany, M., Li, A., Meakin, S. et al. Dichloroacetate induced intracellular acidification in glioblastoma: in vivo detection using AACID-CEST MRI at 9.4 Tesla. J Neurooncol 136, 255–262 (2018). https://doi.org/10.1007/s11060-017-2664-9
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DOI: https://doi.org/10.1007/s11060-017-2664-9