Scimex: A new generation of potent antibodies are showing promise in the fight
against HIV. US and German researchers have found that 'broadly
neutralising antibodies' can substantially reduce the amount of virus
present in a patient's blood and keep it down for 28 days, bringing
fresh optimism to the field of HIV immunotherapy.
A potent human immunodeficiency virus (HIV)-1-specific antibody can
suppress HIV for 28 days, a small clinical trial in Nature this week
indicates.
HIV-1 immunotherapy — whereby patients are infused with
virus-fighting antibodies — initially proved ineffective in preclinical
and clinical settings. However, a new generation of more potent broadly
neutralizing antibodies to HIV-1 have been shown to prevent infection
and suppress the virus in studies in humanized mice and non-human
primates, although their potential for human HIV-1 immunotherapy has not
been evaluated.
Michel Nussenzweig and colleagues show that the broadly neutralizing
anti-CD4 binding site antibody 3BNC117 is generally safe and well
tolerated in a dose-escalation phase I clinical trial of 12 uninfected
and 17 HIV-1-infected individuals. They report that the antibody reduced
the amount of HIV-1 in the blood (viral load) of infected individuals
for 28 days.
The study suggests that 3BNC117 is safe and can suppress HIV-1 in
humans, although the authors caution that treatment with the antibody
alone is insufficient to control infection and that antibody–drug or
antibody–antibody combinations will be required for complete viraemic
control. They conclude that antibody-mediated immunotherapy, which,
unlike currently available drugs, engages host immunity directly, should
be further explored as an approach to HIV-1 prevention, therapy and
cure.