This week saw an announcement from the University of Chicago's Pritzker School of Molecular Engineering. A new type of vaccine "has shown in the lab setting that it can completely reverse autoimmune diseases like multiple sclerosis and type 1 diabetes all without shutting down the rest of the immune system." A typical vaccine teaches the human immune system to recognize a virus or bacteria as an enemy that should be attacked. The new "inverse vaccine" does just the opposite: it removes the immune system's memory of one molecule. While such immune memory erasure would be unwanted for infectious diseases, it can stop autoimmune reactions like those seen in multiple sclerosis, type I diabetes, or rheumatoid arthritis, in which the immune system attacks a person's healthy tissues. The inverse vaccine, described in Nature Biomedical Engineering, takes advantage of how the liver naturally marks molecules from broken-down cells with "do not attack" flags to prevent autoimmune reactions to cells that die by natural processes. Pritzker School of Molecular Engineering researchers coupled an antigen a molecule being attacked by the immune system with a molecule resembling a fragment of an aged cell that the liver would recognize as friend, rather than foe. The team showed how the vaccine could successfully stop the autoimmune reaction associated with a multiple-sclerosis-like disease...
Jeffrey Hubbell [lead author of the new paper] and his colleagues knew that the body has a mechanism for ensuring that immune reactions don't occur in response to every damaged cell in the body a phenomenon known as peripheral immune tolerance, which is carried out in the liver. They discovered in recent years that tagging molecules with a sugar known as N-acetylgalactosamine (pGal) could mimic this process, sending the molecules to the liver where tolerance to them develops. "The idea is that we can attach any molecule we want to pGal and it will teach the immune system to tolerate it," explained Hubbell. "Rather than rev up immunity as with a vaccine, we can tamp it down in a very specific way with an inverse vaccine."
In the new study, the researchers focused on a multiple-sclerosis-like disease in which the immune system attacks myelin, leading to weakness and numbness, loss of vision and, eventually mobility problems and paralysis. The team linked myelin proteins to pGal and tested the effect of the new inverse vaccine. The immune system, they found, stopped attacking myelin, allowing nerves to function correctly again and reversing symptoms of disease in animals. In a series of other experiments, the scientists showed that the same approach worked to minimize other ongoing immune reactions...
Initial phase I safety trials of a glycosylation-modified antigen therapy based on this preclinical work have already been carried out in people with celiac disease, an autoimmune disease that is associated with eating wheat, barley and rye, and phase I safety trials are under way in multiple sclerosis. Those trials are conducted by the pharmaceutical company Anokion SA, which helped fund the new work and which Hubbell cofounded and is a consultant, board member, and equity holder. The Alper Family Foundation also helped fund the research.
"There are no clinically approved inverse vaccines yet, but we're incredibly excited about moving this technology forward," says Hubbell. Thanks to Slashdot reader laughingskeptic for sharing the news.
See the rest here:
New 'Inverse Vaccine' Shows Potential to Treat MS and Other ... - Slashdot
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