Published: May 09, 2008 01:18 pm            

New method creates antibodies to flu

EDMOND — In the fight against infection, the human immune system isn’t ready for a war.

Vaccines push the immune system to create defenses against illness, but they take time to work. A new process developed by scientists at the Oklahoma Medical Research Foundation stands to revolutionize the process.

In an advance online publication in the journal Nature, OMRF researchers describe a method that can identify and clone human antibodies specifically tailored to fight infections. The new technology holds the potential to quickly and effectively create new treatments for influenza and a variety of other communicable diseases.

When an infection invades, the immune system goes to work manufacturing antibodies to fight it. Most of the antibodies created will have no effect, but very few will bond to the invader and replicate to neutralize the enemy.

The new process develops a “smart bomb” for the immune system, using fully human monoclonal antibodies specifically designed to fight the infection without doing any harm to the body. The research was led by OMRF’s Patrick Wilson of Edmond in collaboration with Rafi Ahmed, Ph.D., of Emory University.

“With this new technique for making human monoclonal antibodies efficiently and quickly, Wilson and Ahmed and their colleagues have made a significant advance,” said Anthony S. Fauci, M.D., director of the National Institute of Allergies and Infectious Diseases in Washington, D.C.

“Their accomplishment opens the way to producing monoclonal antibodies that potentially could be used diagnostically or therapeutically not only for influenza but for other infectious diseases as well.”

In the past, it took years of work and great expense to create what are known as monoclonal antibodies — lab-produced antibodies derived from a single line of cells.

“It was kind of the ‘needle in a haystack’ approach,” said OMRF’s Wilson, senior author on the paper. “The problem is they couldn’t pick the cells that made the antibodies against the pathogens that you wanted to fight.”

A second method, making hybrid antibodies from mouse B cells — white blood cells that produce infection-fighting antibodies — is faster but more dangerous. If the proteins in the hybrid antibodies weren’t compatible, the body could reject the antibodies or react with them in unforeseen ways.

The new process doesn’t use traditional antibody derivation methods or human-mouse hybrids. Instead, the OMRF and Emory researchers isolated antibody-secreting cells, or plasma cells, from people who had received the influenza vaccine, then cloned the antibody genes from these cells.

“We can recognize which cells are made and then make antibodies from them directly,” Wilson said. “It’s a rapid and efficient way to make fully human antibodies.”

While the research is aimed at combating influenza, it can be used to create treatments for any condition — such as anthrax or smallpox — for which there already is a vaccine. Antibodies might also be produced from the immune responses of people with active or chronic infections. This technology has the potential to serve as therapy for someone who already is infected or provide passive immunity to protect against future infection.

“Vaccines can activate the immune system, but they need time to take effect, and many offer less than 100 percent protection and carry risks of side effects,” said Dr. Stephen Prescott, OMRF president.

“With further research and testing, this new method might allow a nurse going into the center of an outbreak to receive a shot to keep her safe from infection. Soldiers in the field could keep a shot of anti-anthrax in their packs in case of a biological attack.”

With more research, this new technology also could be key to fighting diseases such as multiple sclerosis and cancer, Prescott said.

Wilson and his clinical collaborator, OMRF’s Dr. Judith James of Edmond, currently are working to make more antibodies from other infections — including hepatitis C, pneumococcal pneumonia and anthrax. They’re also seeking a partner to help produce large quantities of the influenza antibodies.

“We now have an outstanding opportunity to create antibodies against a host of diseases,” James said. “This discovery has great clinical potential.”

In addition to Wilson, Ahmed and Wrammert, other co-authors of the paper are Jens Wrammert, Joe Miller, Trey Langley, Kenneth Kokko and Christian Larsen of Emory; Gillian Air of the University of Oklahoma Health Sciences Center; and Kenneth Smith, Nai-Ying Zheng, Israel Mays, Lori Garman, Christina Helms and J. Donald Capra of OMRF.

The research was funded by the National Institute of Allergy and Infectious Diseases and the National Center for Research Resources, parts of the National Institutes of Health.

        

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