Tagged: HIV transmission
Plantibodies Could Pave the Road to Wellness (Newsweek, Dec. 15, 2014)
One day, women everywhere may dissolve a postage-stamp sized piece of translucent film in their vaginas. It might look like a Listerine strip. It might be coated with compounds capable of making sperm wriggle in place, keeping them from inseminating a woman’s egg. It might also halt the HIV and herpes viruses found in semen in their tracks. Oh, and those compounds might be grown in a lab inside tobacco plants.
This isn’t a playful exercise in techno-futurism. This is a description of a product, about to enter clinical research phases, that is part of an emerging group of drugs that are radically changing how we treat infectious disease.
In a dark room in the basement of the biomedical research building at Boston Medical Center, Jai Marathe leans over a laser scanning microscope, adjusting a plate that holds a disk of human tissue the size of a poker chip. The flap of flesh was made from human cervical cells by a company that sells them as vaginal models to researchers. Earlier, Marathe coated it in an antibody capable of attacking the sperm cells by making them stick together, preventing them from swimming. Then she coated the tissue in semen donated by a Boston University student. The dose of antibody had been grown inside a tobacco plant at a bioprocessing lab in Kentucky. The “plantibody,” as this and other antibodies grown in plants have been dubbed by the handful of companies that develop them, is the product of decades of sky-high hopes and experimentation.
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Cell-Associated HIV Mucosal Transmission: The Neglected Pathway
FOR IMMEDIATE RELEASE: December 18, 2014
Contact: Gina DiGravio, 617-638-8480, ginad@bu.edu
(Boston)—Dr. Deborah Anderson from Boston University School of Medicine (BUSM) and her colleagues are challenging dogma about the transmission of the human immunodeficiency virus type 1 (HIV-1). Most research has focused on infection by free viral particles, while this group proposes that HIV is also transmitted by infected cells. While inside cells, HIV is protected from antibodies and other antiviral factors, and cell-to-cell virus transmission occurs very efficiently through intercellular synapses. The Journal of Infectious Diseases (JID) has devoted their December supplement to this important and understudied topic.
The 10 articles, four from researchers at BUSM, present the case for cell-associated HIV transmission as an important element contributing to the HIV epidemic. Anderson chides fellow researchers for not using cell-associated HIV in their transmission models: “The failure of several recent vaccine and microbicide clinical trials to prevent HIV transmission may be due in part to this oversight.”
Approximately 75 million people in the world have been infected with HIV-1 since the epidemic started over 30 years ago, mostly through sexual contact and maternal-to-child transmission. A series of vaccine and microbicide clinical trials to prevent HIV transmission have been unsuccessful, and scientists are returning to the drawing board to devise new approaches. The JID supplement advocates for new strategies that target HIV-infected cells in mucosal secretions.
The publication presents evidence that HIV-infected cells populate genital secretions from HIV-infected men and women as well as breast milk, and genetic evidence suggesting that cell-associated HIV transmission occurs in people. Various models for studying cell-associated HIV transmission and molecular targets for intervention are also presented. Finally, the efficacy of current HIV prevention strategies against cell-associated HIV transmission and opportunities for further development are described.
The collaborative team of BUSM researchers includes Drs. Deborah Anderson, Joseph Politch and Jai Marathe from the Departments of OB/GYN and Medicine, Manish Sagar from the Department of Medicine and Rahm Gummuluru from the Department of Microbiology. Collaborators include Drs. Roger LeGrand and Natalie DeJucq-Rainsford from France, Julie Overbaugh from the University of Washington, Tom Moench and Richard Cone from Johns Hopkins University, Kevin Whaley from Mapp Biopharmaceutical and Kenneth Mayer from Harvard Medical School. It is their hope that these articles will help to inform and invigorate the HIV prevention field and contribute to the development of more effective vaccine, treatment, and microbicide strategies for HIV prevention.
Funding was provided by the US National Institutes of Health (grant U19 AI096398) and the
Fond de Dotation Pierre Berge, Sidation, France.
