AIDS researchers have for the first time demonstrated that human blood stem cells can be engineered into cells that can target and kill HIV-infected cells — a process that potentially could be used against a range of chronic viral diseases. The study, published today in PLoS ONE, demonstrates that human stem cells can be engineered into the equivalent of a genetic vaccine.
By Taking CD8 cytotoxic T lymphocytes — the "killer" T cells that help fight infection — from an HIV-infected individual, the researchers identified the molecule known as the T-cell receptor, which guides the T cell in recognizing and killing HIV-infected cells.
These cells, while able to destroy HIV-infected cells, do not exist in enough quantities to clear the virus from the body. So the researchers cloned the receptor and genetically engineered human blood stem cells, then placed the stem cells into human thymus tissue that had been implanted in mice, allowing them to study the reaction in a living organism.
The engineered stem cells developed into a large population of mature, multifunctional HIV-specific CD8 cells that could specifically target cells containing HIV proteins. The researchers also found that HIV-specific T-cell receptors have to be matched to an individual in much the same way that an organ is matched to a transplant patient.
"We have demonstrated in this proof-of-principle study that this type of approach can be used to engineer the human immune system, particularly the T-cell response, to specifically target HIV-infected cells," said lead investigator Scott G. Kitchen, assistant professor of medicine in the division of hematology and oncology at UCLA.
"These studies lay the foundation for further therapeutic development that involves restoring damaged or defective immune responses toward a variety of viruses that cause chronic disease, or even different types of tumors."
The next step is to test this strategy in a more advanced model to determine if it would work in the human body, said co-author Jerome A. Zack, UCLA professor of medicine in the division of hematology and oncology and associate director of the UCLA AIDS Institute. The researchers also hope to expand the range of viruses against which this approach could be used.
Citation: Kitchen SG, Bennett M, Galić Z, Kim J, Xu Q, et al., 'Engineering Antigen-Specific T Cells from Genetically Modified Human Hematopoietic Stem Cells in Immunodeficient Mice', PLoS ONE 2009, 4(12): e8208. doi:10.1371/journal.pone.0008208
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- We Don't Hear Much About The 10,000 French Deaths At Gallipoli
- Columbia's Lame Oz Defense
- Yellowstone Volcanic System Four Times Bigger Than Thought
- The Evolutionary Psychology Reason Some People Will Be Anti-GMO
- Patenting Big Thinking
- We've Forgotten The Trial Of Socrates: Excellence And Winning Aren’t The Same Thing
- WikiLeaks Emails Show Dr. Oz Puts Business First
- "I'm a concert pianist. Should I be giving flute lessons? ..."
- "I meant to say my wife mentioned some treatment for whatever that Dr Oz mentioned on his show...."
- "I'm no mental giant, but I picked up on the snake oil salesmanship qualities of Dr Oz years ago..."
- "Hi, good question. This post states that the carbon being used by the bacteria are from 20k years..."
- "Hal- One would think that any sensible person could smell thesnake oil even through their..."