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Kent State Chemists Create Microscopic Environment to Study Cancer Cell Growth

According to the American Cancer Society, there will be an estimated 1,688,780 new cancer cases diagnosed and 600,920 cancer deaths in the U.S. in 2017.

These numbers are stark and sobering, and worse yet, we still do not know exactly why cancer develops in its victims or how to stop it.

A recent online publication in Nature Nanotechnology by 黑料网 researchers and their colleagues at Kyoto University in Japan, however, may offer new understanding about what turns good cells bad.

Hanbin Mao, Ph.D., professor of chemistry and biochemistry in Kent State鈥檚 College of Arts and Sciences, co-authored a paper with his graduate students, Prakash Shrestha and Sagun Jonchhe, along with four Kyoto University colleagues, titled 鈥淐onfined Space Facilitates G-quadruplex Formation,鈥 which was published in the esteemed journal鈥檚 . The article discusses the genetic factors that influence formation of cancer cells.

鈥淭raditionally, DNA has a two-strand shape 鈥 the double helix 鈥 and its purpose is to code the proteins that form life,鈥 Mao says. 鈥淏ut recently, people have discovered that some DNA has four strands, and we call this the G-quadruplex. This is associated with the inhibition of cancer cells.鈥

However, while most G-quadruplex DNA is beneficial, Mao says some strands go bad, and such mutations actually will enable cancer cell growth. To understand why this happens, scientists first had to learn why DNA sometimes develops into four-strand structures.

All DNA is generated by enzymes and operates like an assembly line. However, Mao says, there comes a point where DNA makes a decision to form a double helix or a quadruplex. He says most DNA takes the two-strand route simply because it is the easiest path. 

Mao says nanometer-sized (one billionth of meter; 25,400,000 nanometers = 1 inch) spaces inside the enzymes are where these formations occur. The inability to mimic these spaces in laboratory settings has prohibited deeper study of the G-quadruplex formation. That is, until now.

With help from chemists and engineers at Kyoto University in Japan, Kent State鈥檚 Mao and graduate students Shrestha and Jonchhe used 鈥淒NA origami鈥 to create a 鈥渘ano cage.鈥 They accomplished this through single-molecule mechanochemical sensing 鈥 a technology Mao鈥檚 lab developed in 2014. Over the past few years, he has published several studies involving the use of 鈥渓aser tweezers,鈥 a tool that provides the ability to hold micrometer- and nanometer-sized biological materials in place.

That technology allowed Mao to create 6-by-6 nanometer-sized cages, then observe how DNA folded into different shapes inside the space.

鈥淚t鈥檚 easier for the DNA to fold inside the cage,鈥 he says. 鈥淚t folds to adapt to the small space, and here DNA naturally folds into the G-quadruplex.鈥

He says the process occurs two to three orders of magnitude faster inside the cage than out, folding 100,000 per second 鈥 a speed that makes forming G-quadruplex as fast and easy as forming a double helix.

鈥淲ith that observation, we may follow the fate of the cell to be cancerous or healthy,鈥 he says. 鈥淪o we can perhaps learn how to introduce molecules or chemicals to interfere with that process.鈥

He says scientists can use ligands 鈥 bonded molecules 鈥 to facilitate this effect with greater potency, thereby reducing the likelihood that cancer cells will form.

鈥淲e can prevent or better treat cancer by stabilizing G-quadruplex structures,鈥 Mao says.

LEARN MORE ABOUT KENT STATE鈥橲 DEPARTMENT OF CHEMISTRY AND BIOCHEMISTRY

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POSTED: Friday, August 25, 2017 02:29 PM
Updated: Thursday, December 8, 2022 10:51 PM
WRITTEN BY:
Dan Pompili

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