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Scientists Identify Receptor for Asthma Associated Virus

By Drug Discovery Trends Editor | April 6, 2015

Scientists funded by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, have identified a cellular receptor for rhinovirus C, a cold-causing virus that is strongly associated with severe asthma attacks. A variant in the gene for this receptor previously had been linked to asthma in genetic studies, but the potential role of the receptor, called CDHR3, in asthma was unknown. The new findings help clarify the function of CDHR3 and point to a novel target for the development of prevention and treatment strategies against rhinovirus C-induced colds and asthma attacks.

Researchers led by James Gern, M.D., at the University of Wisconsin-Madison, discovered that CDHR3 recognizes and binds rhinovirus C, enabling the virus to enter human cells. Like all viruses, rhinovirus C uses the molecular machinery of host cells to replicate and become infectious. While the cellular receptors for other rhinovirus types are known, the rhinovirus C receptor had remained elusive. The scientists identified CDHR3 as a potential candidate by analyzing cells that either were or were not susceptible to rhinovirus C infection. When engineered to produce CDHR3, cells that normally were not susceptible to rhinovirus C could bind the virus and support its replication.

Notably, cells bearing a specific CDHR3 gene variant showed greatly enhanced rhinovirus C binding and produced more progeny virus than cells with normal CDHR3. In previous genetic studies, this variant had been linked to a greater risk of wheezing illnesses and asthma hospitalizations during childhood. The new findings suggest that this gene variant could be a risk factor for childhood wheezing illnesses caused by rhinovirus C, which in turn may increase the risk of developing asthma. In the future, development of drugs that block CDHR3 potentially could help prevent and treat illnesses caused by rhinovirus C.

Source: NIAID


Filed Under: Drug Discovery

 

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