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The balancing act between protection and inflammation in MS
Date:2/17/2012

Scientists have discovered a molecular mechanism that could help explain how multiple sclerosis (MS) and other autoimmune diseases can be exacerbated by the onset of an infection.

MS is an autoimmune disease of the central nervous system which affects approximately 100,000 people in the UK.

The research, directed by Dr Bruno Gran at The University of Nottingham, focused on a population of cells of the immune system known as regulatory T cells, which control and regulate the behaviour of other immune cells. The results of this study have been published in the Journal of Immunology.

Dr Bruno Gran, from the School of Clinical Sciences, said: "The connection between infections and MS is complex. We have known for many years that in some cases, infections can promote disease exacerbations (also known as "MS relapses"). Our study sheds light on a new mechanism that could explain how infections can trigger such relapses. This might have relevance to other autoimmune diseases as well"

When the immune system is functioning properly Regulatory T cells also known as Tregs keep in check the tendency of other cells of the immune system to over react and cause inflammation when the body is under attack from infectious agents such as bacteria or viruses.

The battle of the immune cells

In the battle that follows the research group discovered that bacteria and viruses activate certain receptors of the innate immune system known as Toll-like receptors (TLRs), making the Tregs less inhibitory. The positive consequence is that inflammatory immune cells are more able to react against infectious agents and eliminate them. The problem is that such increased activity of inflammatory immune cells could also increase the occurrence of autoimmune reactions against organs such as the central nervous system.

Research led by award winning PhD student

Most of the experimental work was conducted
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Contact: Lindsay Brooke
lindsay.brooke@nottingham.ac.uk
44-011-595-15751
University of Nottingham
Source:Eurekalert

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