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Lungs may suffer when certain elements go nano

Date:
January 27, 2014
Source:
Missouri University of Science and Technology
Summary:
Nanoparticles are used in all kinds of applications — electronics, medicine, cosmetics, even environmental clean-ups. More than 2,800 commercially available applications are now based on nanoparticles, and by 2017, the field is expected to bring in nearly $50 billion worldwide. But this influx of nanotechnology is not without risks, say researchers. But this influx of nanotechnology is not without risks, say researchers at Missouri University of Science and Technology.

Nanoparticles are used in all kinds of applications -- electronics, medicine, cosmetics, even environmental clean-ups. More than 2,800 commercially available applications are now based on nanoparticles, and by 2017, the field is expected to bring in nearly $50 billion worldwide.

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But this influx of nanotechnology is not without risks, say researchers at Missouri University of Science and Technology.

"There is an urgent need to investigate the potential impact of nanoparticles on health and the environment," says Yue-Wern Huang, professor of biological sciences at Missouri S&T.

Huang and his colleagues have been systematically studying the effects of transition metal oxide nanoparticles on human lung cells. These nanoparticles are used extensively in optical and recording devices, water purification systems, cosmetics and skin care products, and targeted drug delivery, among other applications.

"In their typical coarse powder form, the toxicity of these substances is not dramatic," says Huang. "But as nanoparticles with diameters of only 16-80 nanometers, the situation changes significantly."

The researchers exposed both healthy and cancerous human lung cells to nanoparticles composed of titanium, chromium, manganese, iron, nickel, copper and zinc compounds -- transition metal oxides that are on the fourth row of the periodic table. The researchers discovered that the nanoparticles' toxicity to the cells, or cytotoxicity, increased as they moved right on the periodic table.

"About 80 percent of the cells died in the presence of nanoparticles of copper oxide and zinc oxide," says Huang. "These nanoparticles penetrated the cells and destroyed their membranes. The toxic effects are related to the nanoparticles' surface electrical charge and available docking sites."

Huang says that certain nanoparticles released metal ions -- called ion dissolution -- which also played a significant role in cell death.

Huang is now working on new research that may help reduce nanoparticles' toxicity and shed light on how nanoparticles interact with cells.

"We are coating toxic zinc oxide nanoparticles with non-toxic nanoparticles to see if zinc oxide's toxicity can be reduced," Huang says. "We hope this can mitigate toxicity without compromising zinc oxide's intended applications. We're also investigating whether nanoparticles inhibit cell division and influence cell cycle."

The researchers' findings, "Cytotoxicity in the age of nano: The role of fourth period transition metal oxide nanoparticle physicochemical properties," were published in the Nov. 25, 2013, issue of the journal Chemico-Biological Interactions.


Story Source:

The above story is based on materials provided by Missouri University of Science and Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Yue-Wern Huang et al. Cytotoxicity in the age of nano: The role of fourth period transition metal oxide nanoparticle physicochemical properties. Chemico-Biological Interactions, January 2014

Cite This Page:

Missouri University of Science and Technology. "Lungs may suffer when certain elements go nano." ScienceDaily. ScienceDaily, 27 January 2014. <www.sciencedaily.com/releases/2014/01/140127122150.htm>.
Missouri University of Science and Technology. (2014, January 27). Lungs may suffer when certain elements go nano. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2014/01/140127122150.htm
Missouri University of Science and Technology. "Lungs may suffer when certain elements go nano." ScienceDaily. www.sciencedaily.com/releases/2014/01/140127122150.htm (accessed December 21, 2014).

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