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Issue 25, 2016
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Monodispersed calcium carbonate nanoparticles modulate local pH and inhibit tumor growth in vivo

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Abstract

The acidic extracellular environment of tumors potentiates their aggressiveness and metastasis, but few methods exist to selectively modulate the extracellular pH (pHe) environment of tumors. Transient flushing of biological systems with alkaline fluids or proton pump inhibitors is impractical and nonselective. Here we report a nanoparticles-based strategy to intentionally modulate the pHe in tumors. Biochemical simulations indicate that the dissolution of calcium carbonate nanoparticles (nano-CaCO3) in vivo increases pH asymptotically to 7.4. We developed two independent facile methods to synthesize monodisperse non-doped vaterite nano-CaCO3 with distinct size range between 20 and 300 nm. Using murine models of cancer, we demonstrate that the selective accumulation of nano-CaCO3 in tumors increases tumor pH over time. The associated induction of tumor growth stasis is putatively interpreted as a pHe increase. This study establishes an approach to prepare nano-CaCO3 over a wide particle size range, a formulation that stabilizes the nanomaterials in aqueous solutions, and a pH-sensitive nano-platform capable of modulating the acidic environment of cancer for potential therapeutic benefits.

Graphical abstract: Monodispersed calcium carbonate nanoparticles modulate local pH and inhibit tumor growth in vivo

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Supplementary files

Article information


Submitted
08 Sep 2015
Accepted
24 Dec 2015
First published
25 Dec 2015

Nanoscale, 2016,8, 12639-12647
Article type
Paper
Author version available

Monodispersed calcium carbonate nanoparticles modulate local pH and inhibit tumor growth in vivo

A. Som, R. Raliya, L. Tian, W. Akers, J. E. Ippolito, S. Singamaneni, P. Biswas and S. Achilefu, Nanoscale, 2016, 8, 12639
DOI: 10.1039/C5NR06162H

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