Blue light stimulates the immune system. Free Technical Library News

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Blue light stimulates the immune system

27.12.2016

How can sunlight help the immune system? It is believed that vitamin D plays a role here - recently there is evidence that its deficiency is fraught with a weakening of the immune system. Since vitamin D is synthesized in the skin under the influence of ultraviolet radiation, it turns out that ultraviolet rays from the sun help maintain immunity in working condition.

But UV radiation and vitamin D aren't everything. Researchers at Georgetown University have found that normal blue light from the sun's spectrum stimulates T-cell activity. By the nature of their activity, T-lymphocytes must actively move, since it is they who directly destroy other cells that have become infected with a bacterial or viral infection or have degenerated into malignant cells. Even if we are not talking about T-killers (what they do is clear by name), but about T-helpers or T-regulators that control the strength of the immune response, then they must also be constantly on the move in order to be where they need to be in time .

An article in Scientific Reports says that blue light speeds up T-lymphocytes - they literally begin to crawl faster. Exposure to light in T cells increases the level of hydrogen peroxide, which acts as a chemical warfare agent that kills bacteria, and at the same time serves as a signaling molecule that alerts other immune cells to danger. It is under the action of hydrogen peroxide that T-lymphocytes begin to move faster.

There are a lot of T-cells in our skin, about twice as many as in the blood, which is understandable: a huge number of pathogens enter us from the surface of the body, through wounds, cracks, etc. Although T-lymphocytes sit relatively deep, in the layer dermis, blue light waves still reach them - and one can imagine how an army of excited T-cells after a portion of blue light scatters throughout the body.

However, here it is still worth checking whether light activation of T-cells really helps fight real infections; but if this is true, then immunocompromised patients who lack normal sun could be prescribed blue light exposure, among other things.

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