Bioengineer uses nanoparticles to target drugs

October 8, 2009

Clemson bioengineer Frank Alexis is designing new ways to target drugs and reduce the chances for side effects.

Pharmaceutical commercials can cause the unsettling feeling that if the disease doesn't kill, the cure will, what with a drug's long list of side effects and warnings. Many administered by pill, cream, syringe, IV or liquid can be a hit or miss .

Researchers report that only 1 of 100,000 molecules of an intravenous drug make it to the intended spot in the body.

"The big issues for making medicines more effective are getting drugs to where they are needed and keeping them from breaking down as they circulate through the body," said Alexis. "A way to improve targeting a drug and preventing it from be passed out of the body is putting it in envelopes — putting the drug inside something to protect it until it's at the right spot."

The envelopes Alexis uses are . Think of an M&M, with the nanoparticle being the hard outer candy shell and the chocolate being the medicine. The goal would be the same as for an M&M — to melt in the right place.

Nanotechnology operates on the molecular level. It involves engineering materials on such a small scale that the results can be seen only with electron and atomic force microscopes. Nano-engineers take advantage of natural forces — positive and negative electrical charges, attraction and repulsion, surface texture — to have materials self assemble.

"You would be surprised how we mimic what nature does," said Alexis. It is setting off a storm of innovations in many fields — biology, medicine, material science, computers, manufacturing, physics.

"Nanoparticles can be modified many ways," said Alexis. "They can be coated so that they can be durable and stable. They can be patterned so that they match up like a key and a lock to connect to certain cells, tissues and organs. Some drugs are not taken up because of their physical and chemical properties."

A handful of nanoparticle medicines already have been approved for use treating diseases, particularly cancers. Alexis and other bioengineers are ushering in a new era in medicine.

A challenge for oral medicines, for example, is getting them to do some good before the body destroys them. A patient's metabolism can do its job too well taking a drug out of circulation.

Called "first-pass metabolism," the liver breaks down a drug during its first trip circulating through the body. The result is doctors must use greater amounts of oral medicines to achieve the therapeutic effect. Negative reactions from the higher doses or the inconvenience from prolonged treatment cause many patients to stop taking their medicines.

Nanoparticles can be made to survive the first pass. The particles also can be made to get beyond the body's immune system. Multi-layers on the nanoparticles or nanoshells can resist the body's defenses, enabling the medicine to last longer or reach the intended location.

Dendrimers are nanoparticles that could become the Swiss Army knives of targeted drug delivery. The particles can be made so that a number of different kinds of molecules could be attached to it. One group of could fight the disease, another could enhance images to track the drug, a third could carry a chemical trigger to release the medicine by command from outside the body, another, still, that could send signals about results.

"We are moving ahead in nanoscience in laboratories throughout the world," said Alexis. "Nanoparticle functionalities become more and more complex and the next step is for the research to develop technologies allowing their transfer from the research bench to a pharmaceutical drug. New ways of targeting drugs that will be more effective and safe and more agreeable to patients is just over the horizon."

Source: Clemson University (news : web)

Explore further: Stealth particles to target tumors

Related Stories

Stealth particles to target tumors

August 31, 2005

Stealth nano particles may some day target tumor cells and deliver medication to specific body locations, according to Penn State chemical engineers.

Gold nanoparticles for controlled drug delivery

December 30, 2008

( -- Using tiny gold particles and infrared light, MIT researchers have developed a drug-delivery system that allows multiple drugs to be released in a controlled fashion.

Recommended for you

Physicists develop new technique to fathom 'smart' materials

November 26, 2015

Physicists from the FOM Foundation and Leiden University have found a way to better understand the properties of manmade 'smart' materials. Their method reveals how stacked layers in such a material work together to bring ...

Mathematicians identify limits to heat flow at the nanoscale

November 24, 2015

How much heat can two bodies exchange without touching? For over a century, scientists have been able to answer this question for virtually any pair of objects in the macroscopic world, from the rate at which a campfire can ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.