Featured Research

from universities, journals, and other organizations

Laser-pulse Technique Could Aid Drug Design

Date:
February 17, 2003
Source:
Cornell University
Summary:
Discovery of drugs to treat generalized epilepsy with febrile seizures (GEFS), a genetic disorder that affects 4 million Americans, could now advance more rapidly, predicts a Cornell University biochemist.

DENVER -- Discovery of drugs to treat generalized epilepsy with febrile seizures (GEFS), a genetic disorder that affects 4 million Americans, could now advance more rapidly, predicts a Cornell University biochemist.

George P. Hess, professor of molecular biology and genetics at Cornell, in Ithaca, N.Y., invented a laser-based technique to study signal transmission between cells of the nervous system. The same technique, called laser-pulse photolysis, already has identified a cocainelike analog compound to block the effects of cocaine poisoning on the nervous system, he says.

Hess discusses his laser technique, which could enable drug design and testing for a variety of neurological disorders, in a press briefing scheduled for Saturday, Feb. 15, at 1 p.m. Mountain Time in Room C 110-112 of the Colorado Convention Center, Denver. Later, at the American Association for the Advancement of Science (AAAS) annual meeting, Hess will speak in a Feb. 16 session titled "Shining Light on Signal Transmission Between Cells of the Nervous System."

"Mechanism-based drug design can proceed more rationally, knowing the exact roles and timing of all the chemical players at the junctions between neurons and muscle cells or between neurons and other neurons," Hess says. The recent discovery of cocaine analogs, one application of the laser-pulse photolysis technique, will be reported in the scientific literature, Hess says, adding: "These compounds are not ready for clinical use, but they do provide a lead for pharmaceutical development."

Laser-pulse photolysis allows neuroscientists to look at entire ensembles of molecules -- not just single channels or single molecules -- during split-second chemical reactions that relay electrical signals through the nervous system, Hess explains. "These reactions can be over and done in 0.3 millisecond. To observe them in detail, we need to equilibrate [balance] the receptor with the neurotransmitter in much shorter time frames," he says. One way to beat the clock and test the Effects of a potential therapeutic agent is to present the compound as a "caged neurotransmitter," a specially constructed molecule that has no effect on receptor proteins so it can be mixed with a cell without triggering reactions.

Once the caged neurotransmitter is in place, according to Hess, a single pulse of laser light can cleave the protective cage within microseconds, allowing the neurotransmitter to bind to receptors. Then, as the freshly exposed neurotransmitter opens transmembrane channels through which electrical currents flow, investigators can watch the millisecond shifts -- between open and closed states of channels -- and determine whether a drug, such as a cocaine analog, is having the desired effect.

In the case of GEFS epilepsy, a genetic mutation is believed to be responsible for a single, inappropriate amino acid in the so-called GABA receptor in brain cells. (The disorder is called febrile because, out of the approximately 5 percent of young children who experience seizures during a high fever, a small proportion with a genetic predisposition later develop epilepsy.) Using laser-pulse photolysis, Hess and his students discovered the reason for the receptor malfunction: a shift in the equilibrium from the open-channel form toward the closed-channel form. They also tested several compounds with high molecular weights that can shift the channel-opening equilibrium -- an encouraging indication that small-molecule drugs can be found to overcome mutations in the GABA receptor and halt the raging "electrical storms" that characterize epilepsy.

Also valuable would be a treatment to short-circuit the electro-chemical effects of cocaine, Hess says. "There are more than 5 million cocaine users in the United States alone, at an estimated cost to society of $37 billion annually," he notes, citing a 1999 report by the U.S. Office of National Drug Control Policy. "During the past two decades, many attempts have been made to find compounds that prevent cocaine's inhibition of proteins that are essential in brain function, but compounds that alleviate cocaine inhibition have not been identified -- until now."

The expectation is, Hess says, "that the effects of disease-causing mutations of receptors that control signal transmission between nerve cells will be better understood -- and potentially useful treatments will be identified and tested -- using this new technique."

###

Studies leading to the development of laser-pulse photolysis and tests of its applications were supported, in part, by grants from the National Institutes of Health.


Story Source:

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


Cite This Page:

Cornell University. "Laser-pulse Technique Could Aid Drug Design." ScienceDaily. ScienceDaily, 17 February 2003. <www.sciencedaily.com/releases/2003/02/030217120416.htm>.
Cornell University. (2003, February 17). Laser-pulse Technique Could Aid Drug Design. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2003/02/030217120416.htm
Cornell University. "Laser-pulse Technique Could Aid Drug Design." ScienceDaily. www.sciencedaily.com/releases/2003/02/030217120416.htm (accessed October 23, 2014).

Share This



More Matter & Energy News

Thursday, October 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) — Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) — Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) — As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com
What Is Magic Leap, And Why Is It Worth $500M?

What Is Magic Leap, And Why Is It Worth $500M?

Newsy (Oct. 22, 2014) — Magic Leap isn't publicizing much more than a description of its product, but it’s been enough for Google and others to invest more than $500M. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins