Word: ho
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...initial reaction was, Are you crazy?" recalls Sandy Vasan, a researcher at ADARC who, along with Ho and Huang, is now heading the ibalizumab studies. A clinician who sees patients, Vasan says, "It's really scary to want to put an antibody on CD4. You need CD4." (See "The Year in Health 2009: From...
...Ho didn't even wait to leave the meeting before phoning his lab with instructions to investigate the literature on ibalizumab. "He was so excited about it," says Yaoxing Huang, who received the call and is now one of the two researchers Ho has diverted to investigating the compound. Barely three years later, that initial enthusiasm has only grown, spreading throughout the labs that occupy two floors at ADARC's Lower East Side facility...
That's the beautifully elegant scenario that attracted Ho to the antibody, but the problem is that tying up CD4 this way may not be such a good idea. Taking so many of the body's essential defense cells out of commission means the patient may be left vulnerable to any number of other infectious agents - exactly the immunocompromised position that AIDS patients are trying to avoid. That was the fear that Ho's lab members expressed when he broached the idea...
...Ho believes ibalizumab is more agile than that. CD4, it turns out, is like a marina with several docks; HIV berths in one, and ibalizumab in another, leaving the cell free to fight other pathogens. "If CD4's binding site to HIV is with its nose, then this antibody is binding to the back of CD4's neck," Ho says. That means the cell's ability to function as a pathogen troller is not impaired by being coupled to ibalizumab. "There is a solid scientific rationale for what they are attempting to do," says Harvard's Walker...
...with monkeys to test whether ibalizumab can head off infection not just with the notoriously weaker lab strains of HIV but also but with naturally circulating strains as well. The idea is to hit the antibody with the most potent HIV around, so if the strategy doesn't work, Ho can shut down the project, before it gets too far along...