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HIV infection theory challenged HIV infection theory challenged
(2 days later)
A longstanding theory of how HIV slowly depletes the body's capacity to fight infection is wrong, scientists say.A longstanding theory of how HIV slowly depletes the body's capacity to fight infection is wrong, scientists say.
HIV attacks human immune cells, called T helper cells. Loss of these cells is gradual, often taking many years.HIV attacks human immune cells, called T helper cells. Loss of these cells is gradual, often taking many years.
It was thought infected cells produced more HIV particles and that this caused the body to activate more T cells which in turn were infected and died. It was thought infected cells produced more HIV particles and that this caused the body to activate more T cells which in turn were infected and killed.
Imperial College London modelling suggests that, if that was true, cells would die out in months not years. Modelling by UK and US researchers suggests that, if that was true, cells would die out in months not years.
The Imperial findings have been published in journal PLoS Medicine. The study, led by Emory University in Atlanta and at the Institute of Child health in London, was published in the journal PLoS Medicine.
If the specific process by which HIV depletes this kind of white blood cell can be identified, it could pave the way for potential new approaches to treatment Professor Jaroslav StarkIf the specific process by which HIV depletes this kind of white blood cell can be identified, it could pave the way for potential new approaches to treatment Professor Jaroslav Stark
The imperial team used a mathematical model of the processes by which T cells are produced and eliminated.The imperial team used a mathematical model of the processes by which T cells are produced and eliminated.
Using this they showed that the current theory of an uncontrolled cycle of T cell activation, infection, HIV production and cell destruction - dubbed the "runaway" hypothesis - was flawed.Using this they showed that the current theory of an uncontrolled cycle of T cell activation, infection, HIV production and cell destruction - dubbed the "runaway" hypothesis - was flawed.
They concluded that it could not explain the very slow pace of depletion that occurs in HIV infection.They concluded that it could not explain the very slow pace of depletion that occurs in HIV infection.
They showed that if the theory was correct, then T helper cell numbers would fall to very low levels over a number of months, not years. If the theory were correct, then T helper cell numbers would fall to very low levels over a number of months, not years
Lack of certaintyLack of certainty
Researcher Professor Jaroslav Stark said: "Scientists have never had a full understanding of the processes by which T helper cells are depleted in HIV, and therefore they've been unable to fully explain why HIV destroys the body's supply of these cells at such a slow rate. Researcher Professor Jaroslav Stark, from Imperial College London, said: "Scientists have never had a full understanding of the processes by which T helper cells are depleted in HIV, and therefore they've been unable to fully explain why HIV destroys the body's supply of these cells at such a slow rate.
"Our new interdisciplinary research has thrown serious doubt on one popular theory of how HIV affects these cells, and means that further studies are required to understand the mechanism behind HIV's distinctive slow process of cellular destruction.""Our new interdisciplinary research has thrown serious doubt on one popular theory of how HIV affects these cells, and means that further studies are required to understand the mechanism behind HIV's distinctive slow process of cellular destruction."
The Imperial team thinks one possible explanation could be that the virus slowly adapts itself over the course of the infection.The Imperial team thinks one possible explanation could be that the virus slowly adapts itself over the course of the infection.
But they stress that further analysis is needed to verify this alternative theory.But they stress that further analysis is needed to verify this alternative theory.
Professor Stark said: "If the specific process by which HIV depletes this kind of white blood cell can be identified, it could pave the way for potential new approaches to treatment."Professor Stark said: "If the specific process by which HIV depletes this kind of white blood cell can be identified, it could pave the way for potential new approaches to treatment."
Roger Pebody, a treatment advisor at HIV charity Terrence Higgins Trust, said: "HIV is an incredibly complex virus and research is ongoing to try and establish exactly how it works.Roger Pebody, a treatment advisor at HIV charity Terrence Higgins Trust, said: "HIV is an incredibly complex virus and research is ongoing to try and establish exactly how it works.
"We need more studies in this area before we can draw any clear conclusions.""We need more studies in this area before we can draw any clear conclusions."