Virus-suppressing Bacteria Could Control Transmission by Mosquitoes
Mosquitos infected with the bacteria Wolbachia are significantly worse vectors for dengue virus, but how to establish and spread Wolbachia in an urban mosquito population is unclear. A study published May 30 in the open access journal PLOS Biology shows that over time, strategic releases of mosquitoes infected with the dengue-suppressing bacteria may be enough to allow the virus-resistant insects to spread across large cities.
Leading the work are Professor Michael Turelli, UC Davis Department of Evolution and Ecology, and colleagues from Scott O’Neill’s “Eliminate Dengue Program” based at Monash University, Melbourne.
By Pat Bailey
Hannah Laurence, a third-year student in the UC Davis School of Veterinary Medicine and a Howard Hughes Medical Institute fellow, had the privilege of doing biomedical research during the past year in the laboratory of Professor Jeff Kieft at the University of Colorado School of Medicine.
UC Davis veterinary student Hannah Laurence studied Zika virus through a HHMI fellowship.
Recently, the Kieft lab announced in the journal Science discovery of the molecular process used by the Zika virus to “hijack” the cells that it infects and potentially how the virus makes molecules that are directly linked to disease.
By Pat Bailey
The curtain cloaking how AIDS and HIV (human immunodeficiency virus) impact the human digestive and immune systems has been drawn back a bit further, thanks to a team of researchers from UC Davis’ departments of Food Science and Technology and Medical Microbiology and Immunology.
The small intestine is extremely difficult to study because of its location in the body but plays a critical role in human health. Its inner lining offers both a portal for absorbing nutrients and a barrier against toxins or invasive microbes.
Aedes aegypti, a daytime-biting mosquito that predominantly feeds on humans, has spread to at least seven counties since June 2013, according to UC Davis medical entomologist Anthony Cornel of the UC Kearney Agricultural Research and Extension Center, Parlier, and the UC Davis Department of Entomology and Nematology.
Aedes aegypti carries yellow fever, Zika and other viruses. (CDC photo)
“It’s an issue of great concern, especially as current control methods do not appear to be working well,” said Cornel, who does research on the mosquito in Clovis, Fresno County, where it was discovered in June 2013. Simultaneously, the insect was found in the cities of Madera and San Mateo.
UC Davis researchers have developed a way to use the empty shell of a Hepatitis E virus to carry vaccines or drugs into the body. The technique has been tested in rodents as a way to target breast cancer, and is available for commercial licensing through UC Davis Office of Research.
Hepatitis E virus is feco-orally transmitted, so it can survive passing through the digestive system, said Marie Stark, a graduate student working with Professor Holland Cheng in the UC Davis Department of Molecular and Cell Biology.
A new virus-killing peptide springs from an unexpected source: another virus, Hepatitis C.
Now biomedical engineers at UC Davis and Nanyang Technological University, Singapore show how the HCV alpha-helical (AH) peptide can make holes in the types of membranes that surround viruses. The work is published Jan. 5 in Biophysical Journal.
HCV-AH is known to be active against a wide range of viruses including West Nile, dengue, measles and HIV.
The HCV-AH peptide appears to target an Achilles’ heel common to many viruses, most likely a property of the lipid coating or envelope, said study author Atul Parikh, professor of biomedical engineering at UC Davis. That means that it’s less likely that viruses can readily evolve to become resistant to the peptide.
Chloroplasts, better known for taking care of photosynthesis in plant cells, play an unexpected role in responding to infections in plants, researchers at UC Davis and the University of Delaware have found.
Infection causes tubes called stromules (blue) to grow from chloroplasts (purple) to the nucleus of a plant cell (yellow) carrying signals that boost immune defenses.
When plant cells are infected with pathogens, networks of tiny tubes called stromules extend from the chloroplasts and make contact with the cell’s nucleus, the team discovered. The tubes likely deliver signals from the chloroplast to the nucleus that induce programmed cell death of infected cells and prepare other cells to resist infection. The work is published online June 25 in the journal Developmental Cell.
Encouraging people to stay home instead of going out, along with other “non-pharmaceutical interventions” such as handwashing and wearing facemasks, can limit the spread of influenza virus during an outbreak according to a new study published in the open access journal BMC Infectious Diseases.
The article by researchers at UC Davis, Arizona State University, Georgia State University and Yale University provides evidence that the novel A/H1N1 influenza outbreak that hit Mexico City in April 2009 could have been worse, but spread of the virus was reduced by people’s behavioral response of distancing themselves from each other.
UC Davis researchers are getting a new look at the workings of HIV and other viruses thanks to new techniques in electron microscopy developed on campus.
The envelope (or Env) protein of HIV is a key target for vaccine makers: it is a key component in RV144, an experimental vaccine that is so far the only candidate to show promise in clinical trials. Also called gp120, the Env protein associates with another protein called gp41 and three gp120/gp41 units associate to form the final trimeric structure. The gp120 trimer is the machine that allows HIV to enter and attack host cells.
From a zebra carcass on the plains of Namibia in Southern Africa, an international team of researchers has discovered a new, unusually large virus (or bacteriophage) that infects the bacterium that causes anthrax. The novel bacteriophage could eventually open up new ways to detect, treat or decontaminate the anthrax bacillus and its relatives that cause food poisoning. The work is published Jan. 27 in the journal PLOS One.