HIV: Search for safe contraception receives a boost

The Grand Challenges Exploration (GCE) project funds individuals worldwide who are taking innovative approaches to some of the world’€™s toughest and persistent global health and development challenges.   GCE invests in the early stages of bold ideas that have real potential to solve the problems people in the developing world face every day.  

Hapgood’€™s project is one of more than 80 GCE Round 9 grants announced on this month by the Bill & Melinda Gates Foundation.  

HIV prevalence in young women of childbearing age is very high in sub-Saharan Africa.   Pregnancy poses a significant health risk to mothers and babies due to mother-to-child HIV transmission, high infant and maternal mortality, as well as enormous socio-economic challenges. The choice of contraceptive for young women is a particularly important decision. This choice is complicated by controversial clinical findings that some contraceptives significantly increase susceptibility to HIV infection. Thus a crucial health policy issue is to find the best possible method of contraception that most effectively balances risks with health benefits in these regions.  

Contraceptives can be administered in many different forms, including as injectable compounds, orally, as patches on the skin and in the form of long-acting intra-uterine devices.  

The actual hormones used, which include synthetic derivatives of the natural hormone progesterone, also vary widely in different types of contraceptives.

The research project proposed by Hapgood aims to provide insight as to which is the safest progesterone derivative for contraceptive use by women in high risk areas for HIV infection.   Contraceptive hormones act by binding to special ‘€œreceivers’€ or receptors inside the cell. These receptors then determine the subsequent actions of the hormone.

The proposal is based on findings from Hapgood’€™s group that different contraceptive hormones used in sub-Saharan Africa bind to different subsets of receptors inside the cell to result in differences in the way the cells can mount a defense against the HIV virus.  

She proposes that this may result in some, but not other, contraceptives actually lowering the ability of the body to defend itself against the virus.  

The project involves using human cervical cells from voluntary donors and manipulating them in the laboratory, by adding virus and contraceptives and then measuring markers of the cells’€™ defense mechanisms, as well as markers of viral infectivity.  

The results will be clinically relevant and suggest which contraceptives will pose the least possible risk of increasing HIV infection.

GCE is a US$100 million initiative launched in 2008 by the Bill & Melinda Gates Foundation.  

More than 700 people in 45 countries have received GCE grants.   The grant programme is open to anyone from any discipline and any organisation.   The initiative uses an agile, accelerated grant-making process with short two-page online applications and no preliminary data required.  

Initial grants of US$100,000 are awarded two times a year. Successful projects have the opportunity to receive a follow-on grant of up to US$1 million.


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