Corporate Banner
Satellite Banner
Biologics & Bioprocessing
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Inovio Pharmaceuticals CMV Synthetic Vaccine Constructs Generate Strong and Broad T-Cell Responses in Preclinical Study

Published: Wednesday, November 28, 2012
Last Updated: Wednesday, November 28, 2012
Bookmark and Share
No vaccine or cure exists for virus that can be life threatening to infants, immune compromised, and transplant patients.

Inovio Pharmaceuticals, Inc. announced that testing of multiple synthetic vaccine constructs for cytomegalovirus (CMV) induced robust T cells in mice, demonstrating the potential for a SynCon® DNA vaccine to treat this virus that causes infant death and congenital abnormalities, is associated with cerebral palsy and brain tumors, and is the most common viral infection in organ transplant recipients. CMV is also associated with numerous inflammatory diseases and cancers, and is implicated in hypertension, a major risk factor for cardiovascular diseases.

Results from this preclinical study appear in the peer-reviewed journal, Human Vaccines & Immunotherapeutics, in an article entitled, "Vaccination with synthetic constructs expressing cytomegalovirus immunogens is highly T cell immunogenic in mice."

The genetic complexity of CMV has inhibited the advancement of vaccines for this disease. In this study, DNA vaccine constructs targeting multiple novel CMV antigens were created using Inovio's SynCon® vaccine platform. These SynCon constructs were administered via Inovio's proprietary electroporation-based delivery technology. The vaccine constructs were observed to induce strong and broad CD8+ and CD4+ T cells in an animal model. These findings are vital given the important role T cells play in clearing infection by killing cells that harbor the virus. This is especially crucial in protecting against diseases in different populations such as organ transplant patients that are at high risk from CMV infection.

Dr. J. Joseph Kim, Inovio's President and CEO, said, "Our SynCon® platform has again generated synthetic vaccine candidates that show promise for providing a treatment where there is none. With recent human data showing the powerful killing effect of T cells generated by our therapeutic vaccine for HPV and HPV associated cervical dysplasia and cancer, we look forward to providing Inovio's answer to CMV, a medical problem that has yet to see a vaccine or cure despite 50 years of research."

Scientific Discussion of Results

Inovio researchers first investigated a novel panel of ten CMV immunogens comprised of mainly surface-associated proteins based on promising prior clinical and preclinical data that had been previously shown to be important for inducing cellular immune responses in CMV infection. To maximize the potential for broadly-reactive immunity, Inovio researchers created SynCon® vaccines for each of the target proteins based on amino acid consensus sequences from multiple variant CMV clinical strains, and excluded those from potentially divergent, highly passaged lab-adapted strains. The researchers adopted the same strategy as was shown previously to enhance protective immune responses against divergent strains of influenza and HIV. The designed target sequences were further genetically optimized at the nucleic acid level.

Researchers observed that vaccination with each CMV construct was highly T cell immunogenic in preclinical proof-of-concept mice studies, generating robust and broad T cell responses as extensively analyzed by the T cell ELISPOT assay. Each antigen produced responses against at least four and as many as 28 different regions of the antigen and, importantly, responses from both CD8+ and CD4+ T cells were observed. This increased diversity and magnitude of cellular responses may be critical for effectively mitigating CMV infection and disease in the transplantation setting.

These data demonstrate that Inovio's next-generation SynCon® DNA vaccine technology is effective at inducing CD8+ T cell responses specific to CMV, in contrast to prior strategies that induced mainly CD4+-dominant responses. Additionally, a majority of epitopes identified for the gB, gH, and gL antigens also contained HLAs that have previously been reported to contribute to the suppression of viremia and amelioration of disease. In summary, the elicitation, identification, and characterization of extensive T cell responses driven by Inovio's CMV SynCon constructs will provide an important tool for guiding clinical development of a CMV vaccine. Further ongoing work will determine how many of the 10 antigens will be selected and taken further for clinical development as well as assess the induction of antibody responses to prevent CMV infection.


Further Information

Join For Free

Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 3,200+ scientific posters on ePosters
  • More than 4,800+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.

Related Content

Inovio Pharmaceutical's DNA Vaccine for the MERS Virus Induces Robust Immune Response
No vaccine exists for the MERS virus that has killed 42% of those infected.
Monday, December 02, 2013
Inovio Pharmaceuticals' Potent hTERT DNA Cancer Vaccine Shows Potential to Reduce Tumors and Prevent Tumor Recurrence
Mice and monkey study demonstrates robust and broad immune responses.
Thursday, July 25, 2013
Inovio Pharmaceuticals & U.S. Army Receive $3.5 Million Biodefense Grant
Inovio to advance painless device to simultaneously deliver multiple vaccines using electroporation technology.
Thursday, April 11, 2013
PATH Malaria Vaccine Initiative and Inovio Pharmaceuticals Partner
Follow-on agreement will lead to clinical trials.
Wednesday, January 09, 2013
Scientific News
Antibody-Based Drug for Multiple Sclerosis
New antibody-based drug paves the way for new strategies for controlling and treating multiple sclerosis.
Structure of Cold Virus Solved
Researchers have identified the structure of an elusive cold virus linked to child asthma and respiratory infections, providing the foundation for treating the virus.
'Poison Pill' Fed to Deadly Virus
Researchers have created a genetic modification within a virus (with funny name), rendering it unable to replicate, mutate or cause illness.
World First Alzheimer's Vaccine Breakthrough
Researchers have made a breakthrough discovery towards an effective vaccine for Alzheimer's by targeting associated proteins.
Immunotherapy Drug Combo Targets Cancer
Mayo Clinic researchers identify potential immunotherapy drug combination that shows therapeutic effects against advanced and metastatic cancers.
Study Shows Sandoz Biosimilar Equivalent to Originator Drug
New data shows Sandoz biosimilar candidate has equivalent efficacy to originator etanercept following comparison in psoriasis.
Biomunex Confirms Optimal Properties and Activity of BiXAb® Antibodies
Biomunex‘s Plug-and-Play bispecific antibodies demonstrated excellent in vitro properties and in vivo activity positively differentiating their BiXAb platform from competing formats.
Immunotherapy Reduces Rheumatoid-Linked Cardiovascular Risk
Study shows combination of two extra-low dose anticytokines reduces disease activity and cardiovascular events.
Viable HIV Vaccine Confirmed by Study
HIV Study in macaques confirms clinically viable vaccine opening the way for future treatment in humans.
Sanofi Working on Zika Vaccine with U.S. Army
Sanofi is working in conjunction with the U.S. Army to develop possible Zika vaccine at faster rate following research agreement.
Skyscraper Banner

SELECTBIO Market Reports
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
3,200+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
4,800+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!