Navigation Links
New technique can help nanoparticles deliver drug treatments
Date:5/7/2013

DETROIT A Wayne State University researcher has successfully tested a technique that can lead to more effective use of nanoparticles as a drug delivery system.

Joshua Reineke, Ph.D., assistant professor of pharmaceutical sciences in the Eugene Applebaum College of Pharmacy and Health Sciences, examined how a biodegradable polymer particle called polylactic-co-glycolic acid (PLGA) breaks down in live tissue.

He believes the potential impact of his work is broad, as nanoparticles increasingly have been developed as carriers of drug treatments for numerous diseases and as imaging agents; they also are used in numerous consumer products. The kinetics of nanoparticle biodegradation is an important factor that can control how and where a drug is released, impacting treatment efficacy as well as potential toxicity to nontarget tissues from nanoparticle exposure.

"If nanoparticles given to a patient release a drug before particles can ever get to target tissue, then we get high toxicity and low effect," Reineke said. "Conversely, if particles are drawn to a tissue but don't release the drug until long afterward, then we also don't get the therapeutic effect."

Much previous research has studied nanoparticle biodegradation in vitro, but Reineke and the study's lead author, Abdul Khader Mohammad, Ph.D., a recent WSU graduate, believe they are the first to quantify biodegradation rates after systemic administration.

Their study, "Quantitative Detection of PLGA Nanoparticle Degradation in Tissues following Intravenous Administration," was published recently in the journal Molecular Pharmaceutics. It was supported by funds from the Department of Pharmaceutical Sciences and the Office for the Vice President of Research at Wayne State.

Keeping concentration levels the same, Reineke and Mohammad administered PLGA as particles in sizes of 200 and 500 nanometers (nm) intravenously in mice, an important administration route of nanomedicines for cancer applications, for example, and measured the quantity of the nanoparticles in all tissues and the rates at which it degraded. They then compared those rates to those predicted by in vitro measurements.

Reineke said the 200 nm particles degraded much faster in the body than in vitro, while the 500 nm particles degraded similarly to in vitro analyses. The liver and spleen had the highest concentration of polymers and therefore were easiest to analyze.

Researchers found that 500 nm particles degraded faster in the liver than the spleen, but for the 200 nm size the degradation rate in the liver and the spleen were similar.

"It's known that larger particles degrade differently, and we verified that," Reineke said, "but they didn't quite degrade in vivo the way we would expect. We found that among tissue types there are differences in how they degrade."

"That tells us that in vitro degradation doesn't predict in vivo degradation very well, because we see so many differences."

Reineke said that by in vivo testing of other types of nanoparticles, a mathematical model can be developed to help determine which are most effective and have the lowest toxicity for a given application.

"Optimizing a therapeutic system that utilizes nanoparticles is really about getting that timing correct. In order to do that, we have to know how and when the particles are going to release the drug."


'/>"/>

Contact: Julie O'Connor
julie.oconnor@wayne.edu
313-577-8845
Wayne State University - Office of the Vice President for Research
Source:Eurekalert

Related medicine news :

1. New MRI technique may predict progress of dementias
2. Detecting malaria early to save lives: New optical technique promises rapid and accurate diagnosis
3. New technique may help severely damaged nerves regrow and restore function
4. New Techniques May Improve Infant Heart Surgery
5. New surgical technique for removing inoperable tumors of the abdomen
6. New technique predictably generates complex, wavy shapes
7. Screening for breast cancer without X-rays: Lasers and sound merge in promising diagnostic technique
8. A marker in the lining of the lungs could be useful diagnostic technique for lung cancer screening
9. New technique could reduce number of animals needed to test chemical safety
10. Technique spots disease using immune cell DNA
11. Noninvasive imaging technique may help kids with heart transplants
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/13/2016)... ... 2016 , ... Hidden Cypress in Sun City is the place to be on March 3rd ... Frederick Weniger will be hosting this educational seminar from 5:30 p.m. – 7:00 p.m. ... special pricing on offers. In addition, prizes will be given away and light refreshments will ...
(Date:2/13/2016)... ... ... individuals looking to lead a healthy lifestyle have decreased carbohydrate consumption and increased their ... delved into this niche allowing those giving up their beloved pasta a chance to ... of protein and only 7 grams of carbohydrates per 50 gram serving--a ratio that ...
(Date:2/13/2016)... Tennessee (PRWEB) , ... February 13, 2016 , ... ... the Infusion Nurses Society (INS) states that vein visualization technology should be used ... by healthcare facilities around the world, the INS Standards mandate the use of ...
(Date:2/13/2016)... ... , ... In the early or “honeymoon” stage of a relationship, couples strive ... their way to be romantic, and may exaggerate a strength or two in an ... profile. , A recent study from Queendom.com , however, suggests that new ...
(Date:2/12/2016)... Antonio, TX (PRWEB) , ... February 12, 2016 , ... ... love, as expressed in Blue SKies Buddha, the biography of Rama - Dr. Frederick ... fact a love story, the love of a Buddhist teacher for teaching and helping ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... IRVINE, Calif., Feb. 11, 2016 PRO-DEX, INC. (NasdaqCM: ... quarter ended December 31, 2015. The Company also filed its ... fiscal year 2016 with the Securities and Exchange Commission today. ... December 31, 2015 --> --> ... 2015 increased $2.6 million, or 95%, to $5.4 million from ...
(Date:2/11/2016)... , Feb. 11, 2016   Health 2.0 , ... new health technologies, announced today " 10 Year Global ... health tech over the past ten years.   ... a decade, Health 2.0 has served as the preeminent ... connected with thousands of technologies, companies, innovators, and patient-activists ...
(Date:2/11/2016)... , Feb. 11, 2016  AfterPill.com is reporting that ... alcohol abstinence for all women who are at risk ... U.S. each year and raises the risks of unprotected ... --> According to the Guttmacher Institute, there ... women of child-bearing age, who have sex without the ...
Breaking Medicine Technology: