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Tue Feb 12, 2019, 08:31 PM

German researchers discover how sleep can fight infection


February 12, 2019

Researchers in Germany have discovered why sleep can sometimes be the best medicine. Sleep improves the potential ability of some of the body's immune cells to attach to their targets, according to a new study that will be published February 12 in the Journal of Experimental Medicine. The study, led by Stoyan Dimitrov and Luciana Besedovsky at the University of Tübingen, helps explain how sleep can fight off an infection, whereas other conditions, such as chronic stress, can make the body more susceptible to illness.

T cells are a type of white blood cell that are critical to the body's immune response. When T cells recognize a specific target, such as a cell infected with a virus, they activate sticky proteins known as integrins that allow them to attach to their target and, in the case of a virally infected cell, kill it. While much is known about the signals that activate integrins, signals that might dampen the ability of T cells to attach to their targets are less well understood.

Stoyan Dimitrov and colleagues at the University of Tübingen decided to investigate the effects of a diverse group of signaling molecules known as Gαs-coupled receptor agonists. Many of these molecules can suppress the immune system, but whether they inhibit the ability of T cells to activate their integrins and attach to target cells was unknown.

Dimitrov and colleagues found that certain Gαs-coupled receptor agonists, including the hormones adrenaline and noradrenaline, the proinflammatory molecules prostaglandin E2 and D2, and the neuromodulator adenosine, prevented T cells from activating their integrins after recognizing their target. "The levels of these molecules needed to inhibit integrin activation are observed in many pathological conditions, such as tumor growth, malaria infection, hypoxia, and stress," says Dimitrov. "This pathway may therefore contribute to the immune suppression associated with these pathologies."

More:
https://www.brightsurf.com/news/article/021219476045/german-researchers-discover-how-sleep-can-fight-infection.html

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Reply German researchers discover how sleep can fight infection (Original post)
Judi Lynn Feb 12 OP
PoindexterOglethorpe Feb 12 #1

Response to Judi Lynn (Original post)

Tue Feb 12, 2019, 10:29 PM

1. This is simply one more study that nails this down.

I was reading recently that in a study done giving people flu shots (the real thing, no placebo here) where one group get 8 hours of sleep the night before, another group 6 hours, and I think there was a third that got only 4 hours. Surprise, surprise, when tested afterwards (I think by some kind of blood test), the third group had a greatly diminished immunity or resistance to flu. Unlike the 8 hours of sleep group which showed the maximum expected effectiveness of the vaccine.

There's almost as much ignorance attached to our very real need for a good night's sleep as there is to, oh, I dunno, maybe the effectiveness of vaccines?

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