Navigation Links
Potential vaccine developed for deadly leishmaniasis disease

Development of a fundamentally new "candidate," or potential, vaccine for visceral leishmaniasis, a parasitic disease that kills about 60,000 people annually, is reported in the current issue of ACS Chemical Biology. Spread by the bite of infected female sand flies, visceral leishmaniasis infects about 500,000 people annually, with the majority of cases occurring in India, Bangladesh, Nepal, Sudan and Brazil.

Despite a major research thrust by the World Health Organization (WHO), no effective vaccine exists for the visceral, or internal, form of leishmaniasis. A milder form of leishmaniasis, which infects the skin, was reported among American military personnel during Operation Desert Storm and other conflicts in the region.

Peter H. Seeberger, Ph.D., of the Laboratory for Organic Chemistry at the Swiss Federal Institute of Technology (ETH) in Zurich headed the research group. It also included researchers from the Swiss Tropical Institute in Basel and Pevion Inc., a biotech company focusing on virosomal delivery systems. The group reported their findings in ACS Chemical Biology, one of 34 peer-reviewed journals published by the American Chemical Society, the world’s largest scientific society.

Several leishmaniasis candidate vaccines are in various stages of development. Seeberger’s group, however, reported development of a unique two-part preparation. It is among a new genre of carbohydrate-based vaccines stirring excitement in medical circles. Carbohydrates are chemical compounds that include sugar and are made from units linked together like beads on a chain.

"This is the first and only carbohydrate vaccine candidate against this disease," Seeberger stated. "This candidate vaccine brings something new to the table and may be of use not only in humans but also for pet vaccines. Dogs get leishmaniasis, particularly in Southern Europe and a vaccine is urgently needed there, as well."

Carbohydrate vaccines alre ady are used in everyday medicine, including vaccines to immunize against meningitis and other bacterial infections, mainly in small children in the United States. Those vaccines use carbohydrates isolated from the actual bacteria responsible for the diseases. The carbohydrates act as antigens, which stimulate the immune system to deploy a protective shield against disease.

"Right now there is a major push to utilize synthetic carbohydrates as antigens in order to control the purity and composition and avoid possible contamination," Seeberger explained. His own group, together with a biotech company ?Ancora Pharmaceuticals in Medford, Mass. ?is working on one such malaria vaccine that is in late-stage preclinical trials. Other candidate vaccines against anthrax and tuberculosis are at an earlier stage of development.

One major drawback with carbohydrate vaccines is the difficulty in getting them to produce a strong immune response. Vaccine manufacturers achieve this by adding a booster substance ?an adjuvant. The standard existing adjuvant, alum, has limitations. Potential alternative adjuvants are toxic, expensive or have other problems.

Seeberger’s candidate vaccine combines the delivery vehicle, immune-stimulating antigen and adjuvant into one package.

The delivery vehicle is an influenza virosome ?the empty envelope of the influenza virus. These flu virus shells contain none of the infectious genetic material in full-fledges flu viruses. The virosome also acts as an "adjuvant," boosting the immune response of the candidate vaccine. The antigen is a synthetic carbohydrate similar to substances on the surface of the leishmaniasis bacteria.

With laboratory studies showing that the candidate vaccine produces a strong protective action against leishmaniasis, Seeberger’s group is moving on to the next step toward a leishmaniasis vaccine ?tests in animals.

"To date, carbohydrates have not been used on this delivery platfo rm," Seeberger said. "Therefore, this is a proof-of-principle study that will be applicable to many carbohydrate antigens of importance in other diseases as well," he said. Seeberger cited both infectious and parasitic diseases and vaccines against cancer.

WHO assigned a high priority to development of a leishmaniasis vaccine because of the huge human toll and the lack of any effective treatment. The most common drugs used to treat leishmaniasis have serious side effects and are expensive.

Symptoms of visceral leishmaniasis include fever, weight loss, and abnormalities of the liver and spleen.


'"/>

Source:American Chemical Society


Related biology news :

1. Novel Enzyme Shows Potential As An Anti-HIV Target
2. Potential Cure for Lymphoma in HIV patients
3. Potential treatments for neurofibromatosis
4. Stem Cell Research Shows Potential for Replacing Tissue Damaged in Heart Attacks
5. Potential Drug Target For Treating Cocaine Abuse Found
6. Potential heart benefit found in stem cells
7. Research advances quest for HIV-1 vaccine
8. A much-needed shot in the arm for HIV vaccine development
9. Discovery of key proteins shape could lead to improved bacterial pneumonia vaccine
10. Gene vaccine for Alzheimers disease shows promising results
11. Influenza vaccine uses insect cells to speed development
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:1/18/2017)... 2017 MedNet Solutions , an ... entire spectrum of clinical research, is proud to ... for the organization in terms of corporate growth, ... products and services. The company,s exceptional achievements can ... iMedNet ™ – ...
(Date:1/11/2017)... Intoxalock, a leading ignition interlock provider, has ... patent-pending calibration device. With this new technology, Intoxalock is ... data logs and process repairs at service center locations, ... drunk driving through the application of cutting-edge technologies is ... also for the customer who can get back on ...
(Date:1/4/2017)... of attendees at this year,s International Consumer Electronics Show (CES), A&D ... and services, will be featuring its new line of ULTRA CONNECT ... CES Exhibit Suite , the new upper arm and wrist smart blood ... product platform.  Continue Reading ... ...
Breaking Biology News(10 mins):
(Date:1/19/2017)... , ... January 19, 2017 , ... ... product vigilance software to leading biopharmaceutical and medical device manufacturers and regulators, is ... fully 21 CFR Part 11-compliant email client designed to provide product vigilance departments ...
(Date:1/19/2017)... Jan. 19, 2017  ArmaGen, Inc., today announced ... Ph.D., as chief executive officer, as well as ... brings to ArmaGen more than 17 years of ... development of biotherapeutics and pharmaceuticals. ... diverse experience and skillset necessary to lead ArmaGen ...
(Date:1/19/2017)... ... January 18, 2017 , ... The American Medical Informatics Association ... Data Sharing Policy. Specifically, the nation’s leading informatics experts, said data sharing plans ... policy. AMIA recommended that NIH earmark funding for researchers to produce and execute ...
(Date:1/19/2017)... ... , ... FireflySci Inc. is a go-getter type of company that continues to ... two main factors. The first is the amazing customer service that the FireflySci ... all around the world. , 2016 was a tremendous sales year for FFS and ...
Breaking Biology Technology: