One potential weapon is a small-molecule "broad spectrum" antiviral that will fight a host of viruses by attacking them through some feature common to an entire class of viruses. For example, there are two categories of viruses: lipid-enveloped and non-enveloped. Enveloped viruses are surrounded by a membrane that in effect serves as a mechanism through which a virus inserts its genome into a host cell, infecting it. Is there something out there that might disrupt that action in as many viruses as possible — and not produce unwanted side effects?
A group of researchers led by a team from UCLA and including others from the University of Texas at Galveston, Harvard University, Cornell University and the United States Army Medical Research Institute of Infectious Diseases may have found just such a compound.
In a proof-of-principle study published online in Proceedings of the National Academy of Sciences, the researchers have identified an antiviral small molecule that is effective against numerous viruses, including HIV-1, influenza A, filoviruses, poxviruses, arenaviruses, bunyaviruses, paramyxoviruses and flaviviruses. These viruses cause some of the world's deadliest diseases, such as AIDS, Nipah virus encephalitis, Ebola, hemorrhagic fever and Rift Valley fever.
Even better, the compound — a rhodanine derivative that the researchers have dubbed LJ001 — could be effective against new, yet-to-be discovered enveloped viruses.
"Since the government has changed its priorities to support development of broad spectrum therapeutics, more and more groups have been screening compound libraries for antivirals that are active against multiple viruses in a specific class," said Dr. Benhur Lee, associate professor of microbiology, immunology and molecular genetics at the David Geffen School of Medicine at UCLA and the primary investigator of the four-year study.
U.S. Food and Drug Administration–approved broad spectrum antivirals do exist but are rare, for various reasons. Ribavirin, for instance, affects both the virus proteins and the host cell and is effective on only a limited number of viruses, such as respiratory syncytial virus and Lassa fever virus. And á–interferon, which is used against the hepatitis C virus, produces unwanted side effects and is too expensive for widespread use.
But the putative mechanism for LJ001 is surprising, according to Lee, who is also a member of the UCLA AIDS Institute.
"We provide evidence that the small molecule binds to both cellular and viral membranes, but its preferential ability to inactivate viral membranes comes from its ability to exploit the biogenic reparative ability of metabolically active cells versus static viral membranes," he said. "That is, at antiviral concentrations, any damage it does to the cell's membrane can be repaired, while damage done to static viral membranes, which have no inherent regenerative capacity, is permanent and irreversible."
Lee and his collaborators developed their concept of LJ001 as interfering only with enveloped viruses after testing 23 pathogens in cell culture. Studies of nine of those agents — including Ebola virus, Nipah virus and Rift Valley fever virus — required high- or maximum-containment facilities and were carried out in the biosafety level 3 and 4 laboratories of the University of Texas Medical Branch at Galveston (UTMB) and USAMRIID.
"Once we started testing more and more, we figured out that it was only targeting the enveloped viruses," said Alexander N. Freiberg, director of UTMB's Robert E. Shope, M.D., Laboratory.
The Shope BSL4 lab was also used for mouse experiments with Ebola and Rift Valley fever virus that further confirmed the protective value of LJ001.
While the exact mechanism of viral membrane inactivation is unknown, the researchers are pursuing some promising leads that could answer that question.
Additionally, the drug does not appear to be toxic in vitro or in animals when used at effective antiviral concentrations.UCLA has filed for a patent on the use of the compound.
Other authors are Mike C. Wolf, Tinghu Zhang, Zeynep Akyol-Ataman, Andrew Grock, Patrick W. Hong, Natalya F. Watson, Angela Q. Fang, Hector C. Aguilar, John P. Miller, Steven Chantasirivisal, Vanessa Fontanes, Oscar Negrete, Robert Damoiseaux, Paul Krogstad, Asim Dasgupta, Kym F. Faull and Michael E. Jung, all of UCLA; Alexander N. Freiberg, Sara E. Woodson and Michael R. Holbrook, of the University of Texas at Galveston; Jianrong Li and Sean P. Whelan, of Harvard University; Matteo Porotto and Anne Moscona, of Cornell University; and Anna N. Honko and Lisa E. Hensley, of the United States Army Medical Research Institute of Infectious Diseases.
The National Institutes of Health, UCLA CFAR, the Burroughs Wellcome Fund, the March of Dimes, the California NanoSystems Institute, a UCLA Microbial Pathogenesis Training Grant, the Warsaw Fellowship Endowment, and a Rheumatology Training Grant funded this research.
The UCLA AIDS Institute, established in 1992, is a multidisciplinary think tank drawing on the skills of top-flight researchers in the worldwide fight against HIV and AIDS, the first cases of which were reported in 1981 by UCLA physicians. Institute members include researchers in virology and immunology, genetics, cancer, neurology, ophthalmology, epidemiology, social science, public health, nursing, and disease prevention. Their findings have led to advances in treating HIV, as well as other diseases, such as hepatitis B and C, influenza and cancer.
For more news, visit the UCLA Newsroom and follow us on Twitter.
Enrique Rivero | Newswise Science News
First time-lapse footage of cell activity during limb regeneration
25.10.2016 | eLife
Phenotype at the push of a button
25.10.2016 | Institut für Pflanzenbiochemie
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Life Sciences
25.10.2016 | Earth Sciences