Navigation Links
New vaccine prevents CMV infection and disease in mice

Researchers at the University of California, San Diego (UCSD) Skaggs School of Pharmacy and Pharmaceutical Sciences have patented a strategy for developing a human vaccine to prevent against Human Cytomegalovirus (hCMV) infection and disease.

CMV, a type of herpes virus, is the leading viral cause of birth defects and a serious problem in patients with compromised immune systems. The body’s natural immunity doesn’t protect against infection by the virus, estimated to be present in 50 to 75 percent of all adults.

“Until now, scientists haven’t been able to develop a vaccine to protect against CMV,” said Deborah H. Spector, Ph.D., UCSD Professor of Cellular and Molecular Medicine and faculty member of the Skaggs School of Pharmacy and Pharmaceutical Sciences. “Using a two-pronged approach, we successfully created and tested a vaccine in a mouse model with CMV that shows enormous promise for re-directing the body’s immune system, enabling it to fight the virus.”

The mouse vaccine generates an immune response that protects against both infection and development of disease when the virus is present by completely disarming the virus’s ability to replicate and establish a persistent infection. The work is currently online in advance of publication in the July issue of Journal of Virology.

“Our approach generates an immune response that is different from the normal response to the virus, and we hope to have found an ‘Achilles’ heel’ in the defenses that the virus uses to evade the immune system,” said Spector. “The virus has evolved to persist in the host by evading the immune responses either by hiding or by misdirecting the host’s immune responses. We found a way to teach the host immune system to not be tricked by the virus.” She added that the next step is to apply this strategy to create a vaccine for use in humans.

CMV is a virus that, while carried by the majority of adults in the United States, can remain d ormant for years, if not the lifetime, of a healthy individual. However, two percent of all children are born with the virus passed on by the mother in utero, and 15 percent of those children will show symptoms such as hearing loss, mental retardation, motor or learning disabilities. Because the host’s natural immune system can protect from the disease but can’t rid the body of the virus, people remain infected and can become re-infected or infect others through saliva.

“Children in day care settings, for example, or adults who are sexually active, can pass along the virus,” explained Spector. “It becomes a serious problem in developing infants during the pregnancy or in those whose immune system is compromised, such as AIDS or transplant patients.”

When a persistent virus such as CMV infects an individual, it disarms the host immune system in two ways – by hiding or masking the proteins that would normally provoke an immune response, or by fooling the immune system into mounting a response that doesn’t work to eradicate the virus.

“We needed a way to make the host defense system sit up and take notice,” said Christopher S. Morello, Ph.D., first author of the study.

To do this, the researchers devised a vaccine with a one-two punch that combines a DNA immunization that targets T-cells to essential genes required for CMV replication, with a killed virus that prompts the body’s B-cells to generate an antibody response.

The vaccine contains the DNA of two essential genes that are essential for replication of the virus. These genes – which are also found in other herpes viruses such as chicken pox or herpes simplex – have the same or very similar sequence, structure and function whether in human or mouse viruses, and present a novel target for the host’s T-cells to muster forces and attack the virus. Secondly, the vaccine also contains a “boost” from an inactivated virus, which generates an antibody response. Neither approach alone would give complete protection.

“In mice, the vaccine not only fought the disease, but prevented the infection from being established in the first place,” Morello said.

Researchers at UCSD hope to begin pre-clinical work on development of a human vaccine. If successful, an FDA-approved, commercially licensed hCMV vaccine could be administered to specific at-risk populations, such as females prior to child-bearing years, day care providers, organ transplant recipients, or as part of regular childhood immunizations.

“This approach may also be valid for a number of diseases associated with persistent or latent infections, including all types of herpes-associated diseases, AIDS, or hepatitis,” said Spector. These viruses persist because immune responses generated by the viral infection are not able to eradicate the virus.
'"/>

Source:University of California - San Diego


Related biology news :

1. Research advances quest for HIV-1 vaccine
2. A much-needed shot in the arm for HIV vaccine development
3. Discovery of key proteins shape could lead to improved bacterial pneumonia vaccine
4. Gene vaccine for Alzheimers disease shows promising results
5. Influenza vaccine uses insect cells to speed development
6. Norovirus, AIDS vaccine and Hepatitis Virus
7. HIV vaccine trial breaks ground for future research
8. Live vaccines more effective against horse herpes virus
9. NIAID begins clinical trial of West Nile virus vaccine
10. Designing vaccines by computer
11. Wake Forest scientists find new combination vaccine effective against plague

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/3/2017)...  Data captured by IsoCode, IsoPlexis Corporation,s ... statistically significant association between the potency of ... objective response of cancer patients post-treatment. The ... cancer patients will respond to CAR-T cell ... to improve both pre-infusion potency testing and cell ...
(Date:3/30/2017)... The research team of The Hong Kong Polytechnic University (PolyU) ... ground breaking 3D fingerprint minutiae recovery and matching technology, pushing contactless ... use in identification, crime investigation, immigration control, security of access and ... ... A research team led by Dr Ajay Kumar ...
(Date:3/29/2017)... March 29, 2017  higi, the health IT company ... North America , today announced a Series ... acquisition of EveryMove. The new investment and acquisition accelerates ... tools to transform population health activities through the collection ... higi collects and secures data today on ...
Breaking Biology News(10 mins):
(Date:8/15/2017)... 15, 2017 After spending the past two years building ... data collection, GeneFo now offers this platform to healthcare stakeholders (hospitals, ... support, adherence, and data collection vis a vis their members, under ... successful launch of this offer. ... GeneFo ...
(Date:8/15/2017)... San Diego, CA (PRWEB) , ... August 15, ... ... science company pioneering graphene biosensors that accelerate pharmaceutical and biotherapeutics development, announces the ... reduces the number of steps needed to gain kinetic binding data for a ...
(Date:8/15/2017)... , ... August 15, 2017 , ... Any expert in ... has compromised these disciplines for more than half a century. Despite their essential ... It is widely known that molecular tags developed for this purpose also tag ...
(Date:8/15/2017)... , ... August 15, 2017 , ... The Conference ... on Immuno-Oncology 360° (IO360°) programming through a series of upcoming panels and events. The ... 7-9, 2018, at The Roosevelt Hotel in New York City. , “With our experience ...
Breaking Biology Technology: