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Study opens the door to a new approach to attacking herpesviruses

by Medical Finance
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Study opens the door to a new approach to attacking herpesviruses
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A new study published this week in mBio, an open access journal of the American Society for Microbiology, has opened the door to a new approach to attacking herpesviruses.

The study demonstrated that targeting 2 metal ion-dependent enzymes of human herpesviruses with 2 compounds, AK-157 and AK-166, can inhibit the replication of the virus. The finding provides new opportunities to developing agents against herpesviruses.

A lot of people know the herpes simplex viruses, but there is actually a family of 9 different herpesviruses including cytomegalovirus (CMV) which causes a lot of problems for immunocompromised people, folks getting transplants and chemotherapy patients for example. We need better therapeutic agents that can be used in these very vulnerable populations. Right now, the therapeutic agents that are out there aren’t terribly effective in terms of being able to treat all the viruses, and many of them have a significant dose-limiting toxicities and associated side effects.”


Dennis Wright, PhD, Study Co-Author and Professor of Medicinal Chemistry, School of Pharmacy, University of Connecticut

Ideally, said Wright, there would be 1 drug that would inhibit the reactivation of all 9 of the herpesviruses. Co-study author Sandra K. Weller, Ph.D., a distinguished professor of molecular biology and biophysics in the School of Medicine at the University of Connecticut, identified targets that would allow just that. She identified herpesvirus enzymes that require 2 magnesiums for the herpesvirus to replicate. “The majority of drug discovery efforts against herpesviruses has focused on nucleoside analogs that target viral DNA polymerases. We are pursuing a strategy based on targeting two-metal-ion-dependent viral enzymes,” said Weller.

In test tube studies, the researchers tested the ability of a panel of compounds to inhibit specific 2 metal ion-dependent enzymes as well as herpesvirus replication. The panel of compounds tested included HIV integrase inhibitors, the anti-influenza agent baloxavir, 3 natural products previously shown to exhibit anti-herpes simplex virus (HSV) activity, and two 8-hydroxyquinolones, AK-157 and AK-166.

While HIV integrase inhibitors have been reported to inhibit replication of herpesviruses, the researchers found the integrase inhibitors exhibited weak overall anti-HSV-1 activity. However, the researchers found that 8-hydroxyquinolones displayed strong antiviral activity against both HSV-1 and CMV and could inhibit 1 or more of the 2 metal ion dependent enzymes. This opens up the possibility of potentially developing dual targeting agents against herpesviruses.

Source:

American Society for Microbiology

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