Soleimani M, Elmi F, Mousavie Anijdan SH, Mitra Elmi M. Evaluating the Radiosensitization Effect of Hydroxyapatite Nanoparticles on Human Breast Adenocarcinoma Cell Line and Fibroblast.
Iran J Med Sci 2020;
45:368-376. [PMID:
33060880 PMCID:
PMC7519409 DOI:
10.30476/ijms.2020.46796]
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Abstract
Background:
Nanohydroxyapatite (nHAP) exhibit anti-proliferative effects on various cancer cells. However, to date, there are only
a few studies on the radiosensitization effect of nHAP. The present study aimed to investigate the possible enhancement of
the radiosensitization effect of nHAP on human breast adenocarcinoma cancer (MCF-7) and fibroblast.
Methods:
nHAP was extracted from fish scales using the thermal alkaline method and characterized at Babol University of Medical Sciences (Babol, Iran)
in 2017. The anti-proliferative and the radiosensitization effects of nHAP were investigated by 3-(4, 5-Dimethylthiazol-2-yl)-2, 5-Diphenyltetrazolium
Bromide (MTT), clonogenic assay, and apoptosis assay. MCF-7 cells and fibroblasts were incubated with different concentrations of nHAP
and at different periods. The MTT solution was added and the absorbance was measured at 570 nm. The MCF-7 cells were exposed to 0, 1.5,
3.5, and 5 Gy X-ray irradiation and incubated for 10-14 days. The data were compared using the one-way analysis of variance (ANOVA) followed by the post hoc tests (Tukey’s method).
Results:
The results showed that nHAP significantly inhibited the growth of MCF-7 cells compared with controls (P<0.001), but the difference was
not statistically significant for fibroblasts (P=0.686 at 400 µg/mL at 72 hours). After 48 hours, the proliferation of MCF-7 cells and fibroblasts
was inhibited by about 81% and 34% at 400 µg/mL concentration, respectively. The radiosensitization enhancement factor for MCF-7 cells and fibroblasts
at a dose of 3.5 Gy and 100 μg/mL concentration were 1.87 and 1.3, respectively.
Conclusion:
nHAP can be considered as a breast cancer radiosensitization agent with limited damage to the surrounding healthy tissue.
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