Okinawa [Japan], March 12 : A chemical compound that may be used to treat a number of autoimmune diseases, such as rheumatoid arthritis and multiple sclerosis, has been discovered by Japanese researchers. As the immune system of the body fails, several diseases might arise.
Autoimmune illnesses affect millions of people worldwide, and their symptoms can be debilitating. The immune system attacks healthy cells and tissues rather of treating pathogens and disorders as it should. While multiple sclerosis may affect the brain and spinal cord, rheumatoid arthritis causes terrible joint pain.
"The key to the development of autoimmune diseases, and thus the way to inhibit this development, lies in our cells, but the underlying mechsm has always been unclear," stated Prof Hiroki Ishikawa, who leads the Immune Signal Unit at the Okinawa Institute of Science and Technology (OIST). "Now, our recent research has shed light on a compound that could suppress the development of these diseases."
Prof. Ishikawa went on to explain that this research, published in Cell Reports, could lead to the development of treatments for autoimmune diseases.
The research focused on T helper 17 cells, or Th17 cells. Th17 cells are a type of T cella group of cells, which form major parts of the immune system. These cells, which exist in high numbers in our guts, evolved to help us fight invasive pathogens but, sometimes, they're overactivated and mistake normal, healthy tissue as pathogens, resulting in autoimmunity. The generation of Th17 cells requires glycolysis, a metabolic process in which glucose is broken down and converted to energy to support the metabolic needs of cells. Glycolysis is essential for the growth of not only Th17 cells but also a variety of cells in our body.
"What's interesting in that excessive glycolysis seems to suppress Th17 cell activity," stated first author, Mr. Tsung-Yen Huang, a PhD candidate in the Immune Signal Unit. "So, we hypothesized that molecules produced during glycolysis may inhibit the cells."
Enter phosphoenolpyruvate, or PEP for short. This chemical compound is a metabolite produced when glucose is converted to energy. Since it is part of such an important process, PEP is generated every day in our bodies. The researchers found that treatment with PEP can inhibit the maturation of TH17 cells, leading to resolution of inflammatory response.
Mr. Huang explained how this was, at first, a confusing result, as it went against all other research on the topic, but he decided to persevere and take a closer look at what could be occurring.
The research led them to a protein called JunB, which is essential for the maturation of Th17 cells. JunB promotes Th17 maturation by binding to a set of specific genes. The researchers found that PEP treatment inhibits the generation of Th17 cells by blocking JunB activity.
Armed with this knowledge, the researchers went on to treat mice that had neuroinflammation caused by autoimmunity with PEP. This disease is very similar to multiple sclerosis and these mice showed positive signs of recovery. The scientists have now filed a patent to continue with this research.
"Our results show the clinical potential of PEP," explained Mr. Huang. "But first we need to increase its efficiency."
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