Antitumor Effect by Hydroxyapatite Nanospheres: Activation of Mitochondria-Dependent Apoptosis and Negative Regulation of Phosphatidylinositol-3-Kinase/Protein Kinase B Pathway.

Abstract

Hydroxyapatite nanoparticles (HA NPs) have been acknowledged for their benign biocompatibility and proliferation inhibition effect on tumor cells, attracting considerable attention for tumor therapeutics without late effects. However, unnoticeable tumor cytotoxicity of HA NPs limited the final clinical therapeutic efficacy. Herein, a two-phase synthetic approach was developed to synthesize sphere-like HA NPs by varying the conventional growth habit of HA precipitate. We present our in vitro and in vivo experimental evidence that spherical HA NPs have surprisingly high inhibitory activities against tumor cells. We demonstrate further, based on our experimental data, that the underlying cause for the death of the tumor cells is related to two concurrent pathways, the mitochondria-dependent apoptosis pathway and negative regulation of the phosphatidylinositol-3-kinase/protein kinase B (PIK3/AKT) pathway. The present study indicated that HA nanospheres can be engineered as nontoxic specific inhibitors for efficient tumor therapeutics with nanobiomaterials.

• Authors: Huan Zhao, Chengheng Wu, Dong Gao, Suping Chen, Yuda Zhu, Jing Sun, Hongrong Luo, Kui Yu, Hongsong Fan, Xingdong Zhang
• Journal: ACS nano (ACS Nano) Vol. 12 Issue 8 Pg. 7838-7854 (08 28 2018) ISSN: 1936-086X [Electronic] United States
• PMID: 30059628 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antineoplastic Agents
• Phosphoinositide-3 Kinase Inhibitors
• Durapatite
• Phosphatidylinositol 3-Kinase
• Proto-Oncogene Proteins c-akt

Topics

• Animals
• Antineoplastic Agents (chemistry, pharmacology)
• Apoptosis (drug effects)
• Cell Line, Tumor
• Cell Proliferation (drug effects)
• Cell Survival (drug effects)
• Drug Screening Assays, Antitumor
• Durapatite (chemistry, pharmacology)
• Female
• Humans
• Mice
• Mice, Inbred BALB C
• Mitochondria (drug effects, metabolism)
• Nanospheres (chemistry)
• Neoplasms, Experimental (drug therapy, metabolism, pathology)
• Phosphatidylinositol 3-Kinase (metabolism)
• Phosphoinositide-3 Kinase Inhibitors
• Proto-Oncogene Proteins c-akt (antagonists & inhibitors, metabolism)
• Signal Transduction (drug effects)