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Device Very Effective at Preventing Immunodeficiency Virus

Intravaginal ring guards against HIV-like virus for one month

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October 1, 2013

kiser

Patrick Kiser

EVANSTON, Ill. --- 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 the 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 demonstrated a 100 percent success rate protecting primates from the simian human 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 the McCormick School of Engineering and Applied Science’s department of biomedical engineering and a visiting associate professor of obstetrics and gynecology in the Feinberg School of Medicine.

The research was published Sept. 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 the drug 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, which has 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 Kiser’s ring in 30 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.

The paper is titled “Intravaginal Ring Eluting Tenofovir Disoproxil Fumarate Completely Protects Macaques from Multiple Vaginal Simian-HIV Challenges.”

Other authors include first authors James M. Smith of the Centers for Disease Control (CDC) and Prevention and Rachna Rastogi of the University of Utah; Janet M. McNicholl, R. Michael Hendry, Chuong T. Dinh and Amy Martin of the CDC; Ryan S. Teller and Umadevi Nagaraja of the University of Utah; and Pedro M. M. Mesquita and Betsy C. Herold of Albert Einstein College of Medicine.

-Sarah Ostman, editor/writer at the McCormick School of Engineering and Applied Science, is the author of this story.