Featured Research

from universities, journals, and other organizations

New medical device extremely effective at preventing immunodeficiency virus

Date:
September 27, 2013
Source:
Northwestern University
Summary:
It's often said that the HIV/AIDS epidemic has a woman's face. The proportion of women infected with HIV has been on the rise for a decade; in sub-Saharan Africa, women constitute 60 percent of people living with disease. While preventative drugs exist, they have often proven ineffective, especially in light of financial and cultural barriers in developing nations. A new intravaginal ring filled with an anti-retroviral drug could help. The ring is easy to use, long lasting, and recently has demonstrated a 100 percent success rate protecting primates from the simian immunodeficiency virus (SHIV). The device will soon undergo its first test in humans.

Previous studies have demonstrated that antiviral drugs can prevent HIV infection, but existing methods for delivering the drug fall short. Pills must be taken daily and require high doses; vaginal gels that must be applied prior to each sex act are inconvenient, yielding poor usage rates. The new ring is easily inserted and stays in place for 30 days.
Credit: Northwestern University

It's often said that the HIV/AIDS epidemic has a woman's face. The proportion of women infected with HIV has been on the rise for a decade; in sub-Saharan Africa, women constitute 60 percent of people living with disease. While preventative drugs exist, they have often proven ineffective, especially in light of financial and cultural barriers in developing nations.

A new intravaginal ring filled with an anti-retroviral drug could help. Developed with support from the National Institute of Allergy and Infectious Diseases by Northwestern University visiting associate professor Patrick Kiser, the ring is easy to use, long lasting, and recently has demonstrated a 100 percent success rate protecting primates from the simian immunodeficiency virus (SHIV). The device will soon undergo its first test in humans.

"After 10 years of work, we have created an intravaginal ring that can prevent against multiple HIV exposures over an extended period of time, with consistent prevention levels throughout the menstrual cycle," said Kiser, an expert in intravaginal drug delivery who joined Northwestern from the University of Utah, where the research was conducted.

Kiser is a new faculty member in Northwestern's McCormick School of Engineering's Department of Biomedical Engineering and visiting associate professor of obstetrics and gynecology in the Feinberg School of Medicine.

The research was published September 16 in the Proceedings of the National Academy of Sciences (PNAS).

Previous studies have demonstrated that antiviral drugs can prevent HIV infection, but existing methods for delivering the drug fall short. Pills must be taken daily and require high doses; vaginal gels that must be applied prior to each sex act are inconvenient, yielding poor usage rates.

The new ring is easily inserted and stays in place for 30 days. And because it is delivered at the site of transmission, the ring -- known as a TDF-IVR (tenofovir disoproxil fumarate intravaginal ring) -- utilizes a smaller dose than pills.

The device contains powdered tenofovir, an anti-retroviral drug that is taken orally by 3.5 million HIV-infected people worldwide, but that has not previously been studied topically. But the ring's strength stems from its unique polymer construction: its elastomer swells in the presence of fluid, delivering up to 1,000 times more of the drug than current intravaginal ring technology, such as NuvaRing, which are made of silicon and have release rates that decline over time.

The upcoming clinical trial, to be conducted in November at Albert Einstein College of Medicine in New York, will evaluate the ring in 60 women over 14 days. The trial will assess the ring's safety and measure how much of the drug is released and the properties of the ring after use.

Other drugs could potentially be integrated into the ring, such as contraceptives or antiviral drugs to prevent other sexually transmitted infections -- a feature that could increase user rates, Kiser said.

"The flexibility to engineer this system to deliver multiple drugs and change release rates is extraordinary and could have a significant impact on women's health," he said.


Story Source:

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


Journal Reference:

  1. J. M. Smith, R. Rastogi, R. S. Teller, P. Srinivasan, P. M. M. Mesquita, U. Nagaraja, J. M. McNicholl, R. M. Hendry, C. T. Dinh, A. Martin, B. C. Herold, P. F. Kiser. Intravaginal ring eluting tenofovir disoproxil fumarate completely protects macaques from multiple vaginal simian-HIV challenges. Proceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1311355110

Cite This Page:

Northwestern University. "New medical device extremely effective at preventing immunodeficiency virus." ScienceDaily. ScienceDaily, 27 September 2013. <www.sciencedaily.com/releases/2013/09/130927123509.htm>.
Northwestern University. (2013, September 27). New medical device extremely effective at preventing immunodeficiency virus. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2013/09/130927123509.htm
Northwestern University. "New medical device extremely effective at preventing immunodeficiency virus." ScienceDaily. www.sciencedaily.com/releases/2013/09/130927123509.htm (accessed September 16, 2014).

Share This



More Health & Medicine News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

President To Send 3,000 Military Personnel To Fight Ebola

President To Send 3,000 Military Personnel To Fight Ebola

Newsy (Sep. 16, 2014) President Obama is expected to send 3,000 troops to West Africa as part of the effort to contain Ebola's spread. Video provided by Newsy
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com
EU Ministers and Experts Meet to Discuss Ebola Reponse

EU Ministers and Experts Meet to Discuss Ebola Reponse

AFP (Sep. 15, 2014) The European Commission met on Monday to coordinate aid that the EU can offer to African countries affected by the Ebola outbreak. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com
Despite The Risks, Antibiotics Still Overprescribed For Kids

Despite The Risks, Antibiotics Still Overprescribed For Kids

Newsy (Sep. 15, 2014) A new study finds children are prescribed antibiotics twice as often as is necessary. 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:
from the past week

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