{"id":6635,"date":"2012-01-31T15:29:09","date_gmt":"2012-01-31T20:29:09","guid":{"rendered":"http:\/\/www.bumc.bu.edu\/busm-news\/?p=2031"},"modified":"2012-01-31T15:29:09","modified_gmt":"2012-01-31T20:29:09","slug":"developing-a-new-weapon-against-hiv-plant-grown-antibodies-could-hold-key","status":"publish","type":"post","link":"https:\/\/www.bumc.bu.edu\/camed\/2012\/01\/31\/developing-a-new-weapon-against-hiv-plant-grown-antibodies-could-hold-key\/","title":{"rendered":"Developing a New Weapon Against HIV: Plant-grown Antibodies Could Hold Key"},"content":{"rendered":"
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BUSM\u2019s Deborah Anderson is working to create a cheap and powerful new weapon against AIDS, with a $13 million grant from the National Institute of Allergy and Infectious Diseases. Photo by Kalman Zabarsky<\/figcaption><\/figure>\n

The latest news on AIDS is sobering. In 2009, 2.6 million people became infected with HIV, according to data released in November by UNAIDS. That\u2019s down from 3.1 million in 1999, but still amounts to 7,000 new infections and nearly 5,000 deaths every day.<\/p>\n

Deborah Anderson is working to reverse this trend. Armed with a five-year, $13.3 million grant from the National Institute of Allergy and Infectious Diseases<\/a> (NIAID), the School of Medicine professor of obstetrics and gynecology and microbiology is developing an innovative approach to AIDS prevention, supplementing the body\u2019s own immune system with novel antibodies grown in tobacco plants. If it works, her system will offer not only a cheap and powerful new weapon against AIDS, but also insights into stopping the spread of viruses from the common cold to the deadly Ebola virus.<\/p>\n

The key to Anderson\u2019s strategy is mucus, that lowly, slippery fluid that coats the nose, protects the eyes, and guards women\u2019s reproductive systems from infection. An expert on mucosal immunology and HIV, Anderson has been studying these subjects for decades. For her PhD research at the University of Texas<\/a>, she investigated the immunology of pregnancy, examining why a mother\u2019s immune system doesn\u2019t reject a fetus and why some women develop an immune response to their partner\u2019s sperm. She garnered a deep understanding of immunology and gynecology, two subjects that became critically important when the AIDS epidemic burst onto the scene.<\/p>\n

In the 1980s, a friend at the National Institutes of Health<\/a> suggested that Anderson study the sexual transmission of HIV\/AIDS, which at the time was just beginning to be understood. \u201cI got involved when the epidemic was getting started,\u201d she says. Since then she has specialized in genital tract immunology, examining how the body\u2019s own immune system responds to HIV, herpes simplex virus (HSV), and other sexually transmitted diseases (STDs).<\/p>\n

Which bring us back to mucus, a secretion that protects cells and wards off infection. Human mucus is made of long molecules called mucins; there\u2019s some evidence that antibodies may tether themselves to mucins and also enter and remain inside skin cells lining the mucus membranes. Anderson is creating a microbicide that a woman can insert in her genital tract via an easy-to-use ring, gel, or film. The microbicide will contain two antibodies that attack different parts of the HIV virus and a third antibody that neutralizes HSV. If the technology works, in the future it could include antibodies that protect against other STDs as well.<\/p>\n

\u201cWe could keep adding antibodies because the body makes a whole host of them,\u201d says Anderson, pointing out that human secretions are already brimming with antibodies. \u201cThe beauty of this system is that we\u2019re just helping Mother Nature.\u201d<\/p>\n

\"Tobacco<\/a>
Tobacco plants offer great promise for fast, low-cost antibody production. Photo by David Hoffman<\/figcaption><\/figure>\n

Despite the worldwide epidemic, HIV is actually a fragile virus. \u201cIt doesn\u2019t infect very easily,\u201d Anderson says. \u201cIf a woman has unprotected sex with an infected man, there\u2019s only about a one in 1,000 chance of getting infected with HIV.\u201d However, other factors can raise the risk, she adds. Genital herpes, for instance, causes inflammation and sores that allow HIV to more easily breach the body\u2019s natural defenses, so Anderson\u2019s microbicide is designed to guard against both HSV and HIV. She hopes this approach will tackle one of the recurring problems with microbicides and spermicides: they work, but people don\u2019t use them. \u201cTake condoms,\u201d she says. \u201cThey\u2019re very effective, but people don\u2019t use them correctly.\u201d She expects that the new microbicide will be easy to use and hopes it will provide protection from HIV\/HSV for up to a month.<\/p>\n

To develop the particular antibodies to be used in the microbicide, Anderson is working with biophysicist Kevin Whaley, a longtime collaborator and founder of Mapp Biopharmaceuticals<\/a>, in San Diego. Mapp is a leader in the production of \u201cplantibodies,\u201d antibodies (in this case, HIV-specific antibodies) grown in plants. Plantibodies can be manufactured in huge amounts quickly and cheaply compared to growing similar antibodies in animals or cell cultures. \u201cThe technology has been around for over 10 years, but now it has gelled,\u201d says Anderson. \u201cThey have been able to ramp up production and lower costs.\u201d Tobacco in particular is easy to grow and harvest and offers great promise for fast, low-cost antibody production. The current cost of antibodies grown in mammals is about $50 a dose, while the cost of tobacco-grown antibodies will likely be much less\u2014somewhere between 20 cents and $1 a dose.<\/p>\n

Anderson\u2019s grant comes from the NIH\u2019s Integrated Preclinical\/Clinical Program for HIV Topical Microbicides<\/a>, created to foster collaboration between industry and academia. Anderson will oversee 6 projects at 10 institutions that will test new antibody formulations, grow the plants, harvest the antibodies, and build and test the application devices. The grant is the largest she\u2019s ever received, and overseeing groups in both academia and industry is new for her. \u201cThis one is challenging because all the paperwork is different in working with industry,\u201d she says.<\/p>\n

Anderson\u2019s first goal over the grant\u2019s five years is to determine which configuration of antibodies works best when mixed with mucus or applied to mucosal skin cells, a process that will take about a year. Then her team will grow large batches of the chosen antibodies in tobacco plants and will test the antibodies in monkeys to see if they prevent the transmission of HIV. The grant will also include preclinical human trials to make sure the antibodies don\u2019t cause irritation or inflammation and to see how long they remain active in the body.<\/p>\n

\u201cOur dream is to put plantibodies on the map for preventing transmission of STDs,\u201d says Anderson. If the technology works, it could have far broader implications. Many other infections enter the body through mucus membranes in the nose, eyes, and lungs. If Anderson\u2019s plantibodies work, they may offer a new weapon for preventing the spread of tuberculosis, influenza, and even that universal annoyance, the common cold.<\/p>\n

This BU Today<\/em> story was written by Barbara Moran (COM\u201996), a science writer in Brookline, Mass. She can be reached through her website WrittenByBarbaraMoran.com<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

The latest news on AIDS is sobering. In 2009, 2.6 million people became infected with HIV, according to data released in November by UNAIDS. That\u2019s down from 3.1 million in 1999, but still amounts to 7,000 new infections and nearly 5,000 deaths every day. Deborah Anderson is working to reverse this trend. Armed with a […]<\/p>\n","protected":false},"author":903,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/posts\/6635"}],"collection":[{"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/users\/903"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/comments?post=6635"}],"version-history":[{"count":0,"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/posts\/6635\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/media?parent=6635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/categories?post=6635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bumc.bu.edu\/camed\/wp-json\/wp\/v2\/tags?post=6635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}