AIDS vaccine delivers
Cellular attack tactic keeps virus at bay.
A new AIDS vaccine could be one of the most promising yet. The drug’s effects in monkeys suggest that killing virus-laden cells may form a key part of future vaccination strategies.
Vaccinated monkeys survived a usually lethal infection with a monkey-human hybrid virus, SHIV. Their primed immune system kept virus levels below detection, Emilio Emini of Merck Research Laboratories in West Point, Pennsylvania, and his team now report1. The results are some of the most encouraging to come out of AIDS vaccine research.
But doubts have already been voiced. Low-lying virus can change to elude the immune response, argue Dan Barouch of Harvard Medical School in Boston and his team. A year after they gave eight animals a similar vaccination, a mutant form of the virus emerged, killing one of the monkeys2.
“This finding should be a reality check rather than a death knell,” Barouch says, adding that the technique can be modified to block the emergence of mutant viruses. Future attempts could hit several different SIV proteins to prevent the virus escaping. Both of the latest vaccines targeted a single protein.
Emini is already pursuing this goal. But like multi-drug-resistant bacteria, HIV could conceivably outwit even a broadly targeted vaccine, although this is less likely. Whether the vaccines tested in the monkeys will be as effective in humans, however, is unknown.
AIDS is notoriously difficult to vaccinate against. Initial attempts took a conventional approach by injecting a single HIV surface protein to trigger the animals’ immune system into producing antibodies that would attack the virus during a subsequent infection. But HIV evades antibodies by hiding the proteins that the antibodies latch onto and by evolving new strains.
“HIV turned out to be much more complicated,” says vaccine researcher Jeffrey Lifson of the National Cancer Institute at Frederick, Maryland. In the past few years, vaccine hunters have switched to a different tack that simulates the way the body naturally attempts to deal with HIV infection – namely, stimulating the immune system to strike virus-infected cells.
Emini’s team achieved this by using a harmless virus to deliver SIV DNA direct to specific immune cells. “It looks encouraging,” says Lifson.
Unfortunately, as with any vaccine that keeps virus levels in check, rather than preventing infection, there is the risk that the pathogen will re-emerge. “It’s an ominous question to ask about the whole strategy,” comments Lifson. Nonetheless, such a vaccine could in theory defer the onset of AIDS and cut the risk of HIV spreading.
The antibody approach may still bear fruit if it can hit essential, unchanging parts of the virus. Meanwhile, the ultimate ideal remains a vaccine that triggers both arms of the immune system – antibodies and cell attack.
- Shiver, J. W. et al. Replication-incompetent adenoviral vaccine vector elicits effective anti-immunodeficiency-virus immunity. Nature, 415, 331 – 335, (2002).
- Barouch, D. H. et al. Eventual AIDS vaccine failure in a rhesus monkey by viral escape from cytotoxic T lymphocytes. Nature, 415, 335 – 339, (2002).
All latest news from the category: Health and Medicine
This subject area encompasses research and studies in the field of human medicine.
Among the wide-ranging list of topics covered here are anesthesiology, anatomy, surgery, human genetics, hygiene and environmental medicine, internal medicine, neurology, pharmacology, physiology, urology and dental medicine.
Researchers show an old law still holds for quirky quantum materials
This surprising result is important for understanding unconventional superconductors and other materials where electrons band together to act collectively. Long before researchers discovered the electron and its role in generating…
Straining memory leads to new computing possibilities
Researchers develop hybrid phase-change memristors that offer fast, low-power, and high-density computing memory.# By strategically straining materials that are as thin as a single layer of atoms, University of Rochester scientists have…
A patch of protection against Zika virus
A simple-to-apply, needle-free vaccine patch is being developed to protect people from the potentially deadly mosquito-borne Zika virus. A prototype using The University of Queensland-developed and Vaxxas-commercialised high-density microarray patch…