Compound overtakes virus-infected cells
There are no approved medications to fight polyomaviruses, which can infect people with weakened immune systems, but scientists say a compound called Retro-2 reduces the spread of the viruses in lab cell cultures.
According to results published in the journal mBio, 12 days of treatment with Retro-2 kept 90.5 percent of cells free from JC polyomavirus, 89 percent of cells clear of the BK polyomavirus, and 84 percent of cells protected from the SV40 polyomavirus.
Infection rates and virus production were much higher among cells in cultures that were similarly infected but left untreated as controls.
That the compound gained the upper hand on viruses that had a head start is a key advance, says Brown University biologist Walter Atwood, corresponding author of the paper.
Other substances have defeated the viruses only if they were used to pre-treat cells before any infection. “But that’s not reality,” Atwood says. “The reality is that someone is already infected with the virus. Whenever in the past we first infected the cells with the virus and then came in with the drug, we’ve never been successful in being able to stop the spread of the virus. This drug is successful at that.”
An ‘ER’ medicine
Retro-2 appears to work by blocking the ability of polyomaviruses to sneak around host cells by hijacking the intracellular protein transportation hub: the endoplasmic reticulum (ER).
Christian Nelson, a Brown postdoctoral researcher currently visiting at Yale University, first thought to study Retro-2 after reading a 2010 paper in Cell showing that it blocks certain toxins, including ricin, from working through the ER. Ricin and polyomaviruses have been thought to operate similarly. The compound also did not appear to be toxic to the mice in that study.
“There are a lot of viruses that use these trafficking mechanisms,” Atwood says.
So the team bought some Retro-2 from Chembridge, a company that makes vast libraries of small-molecule compounds for scientists to study, and pitted it against the polyomaviruses.
The researchers tested it in several ways, including with both kidney cells and brain cells because those are the tissues in the body where they can cause disease. Retro-2 appeared effective in protecting the various cells, as long as it was present within several hours of infection.
“When this causes disease in people, there’s progressively more and more cells infected,” Nelson says. “If we can identify infection early, a treatment could help to stop that progression.”
Improving the chemistry
Atwood and Nelson acknowledge that they aren’t yet sure exactly how Retro-2 blocks the viruses in the ER, but thanks to a team of collaborating chemists, they do know what chemical structure makes the drug effective.
Brown chemistry professors Jason Sello and Paul Williard and graduate student Daniel Carney studied the compound’s chemical structure. In efforts to prepare Retro-2, Sello and Carney found that the last step in the synthesis yielded not only the reported structure but also a form called a dihydroquinazolinone (DHQ). The DHQ was the apparent result of a “cyclizing” reaction of Retro-2 that gives it a different chemical structure.
Further experiments identified the exact structure of the DHQ form and showed that it was the form that matched what Atwood and Nelson had found to be effective in the lab.
This detailed understanding of the compound is helping Sello and his team improve the drug further.
“A critical part of any drug development program is the unambiguous assignment of the structure of the lead compound,” Sello says. “With knowledge of the Retro-2 structure, we have been rationally preparing analogs that have improved pharmacological properties.”
The National Institutes of Health, the National Science Foundation and Johnson & Johnson supported the research. Brown University has a patent filed on the use of the compound against pathogen infections. The research also involved a team of scientists at Yale University led by Daniel DiMaio.
Source: Brown University