Hepatitis C Virus Faces New Weapon from Scientists

In recent human trials for a promising new class of drug designed to target the hepatitis C virus (HCV) without shutting down the immune system, some of the HCV strains being treated exhibited signs of drug resistance.

In response, an interdisciplinary team of Florida State University biologists, chemists and biomedical researchers devised a novel genetic screening method that can identify the drug-resistant HCV strains and the molecular-level mechanisms that make them that way helping drug developers to tailor specific therapies to circumvent them.

The potentially life-saving technology also works when screening other viruses with drug-resistance issues, notably human immunodeficiency virus (HIV) and influenza.

More than 170 million people worldwide are infected with HCV, which leads to both acute and chronic liver diseases.

In collaboration with pharmaceutical firm Gilead Sciences and researchers from the University of Heidelberg (Germany), what our research team discovered was how the latest drug for HCV works and what changes in the virus that makes it resistant to this unique therapy, says Hengli Tang, a Florida State University molecular biologist.

This is knowledge that is essential to drug developers focused on HCV, says Tang, but equally important is that our method, which we call CoFIM (Cofactor-independent mutant) screening, can also be applied to other drug targets and other viruses. And, since we now understand how this latest class of drug works and what causes resistance to it, we can better select other classes of drugs with distinct mechanisms in other words, those that target other parts of the virus in order to craft a combination therapy, which is the future of HCV therapy and the key to overcoming drug resistance.

The groundbreaking research is described in a paper published online in the September 2010 issue of the journal PLoS Pathogens.

Florida State biology doctoral student Feng Yang led the research team. The award-winning scholar earned her PhD in August 2010 and is now a postdoctoral associate at Yale University. Yang designed the CoFIM screening methodology with fellow FSU graduate students, postdoctoral associates and distinguished faculty colleagues including associate professor Tang; chemistry/biochemistry professor Timothy M. Logan, director of FSUs Institute of Molecular Biophysics; and Research Assistant Professor Ewa A. Bienkiewicz, of the FSU College of Medicine, where she directs the Biomedical Proteomics Laboratory.

Driving the teams development of CoFIM screening was the need to identify key cellular cofactors and their mechanisms of action a fundamental aspect of virus-host interaction research.

Cellular cofactors are proteins that normally exist in host cells that have been hijacked by viruses to facilitate viral replication. Tang says. They became accomplices to the invading viruses. Our research team was the first to show that cyclophilin A (CyPA) is an essential cellular cofactor for hepatitis C virus infection and the direct target of a new class of clinical anti-HCV compounds, which include cyclosporine A (CsA)-based drugs that are devoid of immunosuppressive function, Tang adds. In addition, we went a step further than other research teams by employing our newly developed CoFIM screening method, which we used to demonstrate not only HCVs dependence on cellular cofactor cyclophilin A and susceptibility to cyclosporine A drugs but also to uncover the molecular-level regulators that determine those two traits in the virus.

Those molecular-level regulators are known as small interfering RNA libraries collections of molecules so named for their size and ability to suppress gene expression. They act to individually suppress every gene in the cell, resulting in different consequences depending upon which gene is suppressed by a given member in the library.

The CoFIM screening method involves inducing or coaxing the HCV virus to mutate by itself, in vitro, absent the replication assistance it normally receives from a particular cellular cofactor. Then, CoFIM tracks the changes in the viruss response both to CsA-based drugs and any other drug designed to inhibit the cofactor.

Funding for the research conducted at Florida State University came in largest part from a $1.4 million grant awarded by the National Institutes of Health (NIH). And, because chronic liver disease caused by HCV can lead to liver cancer, a grant from the American Cancer Society provided additional support.