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Immune cells, 'macrophages' become activated by body temperature

Date:
April 9, 2012
Source:
National Institute for Physiological Sciences
Summary:
Scientists have identified the mechanism through which TRPM2 is activated by body temperature with hydrogen peroxide produced by immune reactions.
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Macrophages playing an important role in the immune system eat and fight against pathogens and foreign substances in the very beginning of infection. In this condition, macrophages produce reactive oxygen species for sterilization. However, the relation with the temperature sensor was not previously known.

Professor Makoto Tominaga from National Institute for Physiological Sciences (Okazaki Institute for Integrative Bioscience), National Institutes of Natural Sciences, and his research team member Ms. Makiko Kashio have identified the mechanism through which TRPM2 is activated by body temperature with hydrogen peroxide (a kind of reactive oxygen species) produced by immune reactions.

This research result was reported (online in the week of 9th April, 2012) by Proceedings of the National Academy of Sciences.

The research group focused on the relation between hydrogen peroxide and TRPM2.  Although TRPM2 is usually activated by high temperature near 48oC in the absence of endogenous ligands, it becomes activated at our normal body temperature with hydrogen peroxide production. It means that hydrogen peroxide works as "a switch" which controls TRPM2 function. In addition, they found that phagocytic activity of macrophages was enhanced in the febrile temperature (38.5℃).

Professor Tominaga says, “It was also revealed that oxidation of TRPM2 by hydrogen peroxide is involved in the switch-on mechanism and we identified a single amino acid which is oxidized. This newly identified mechanism of TRPM2 regulation may lead to the development of new treatment strategies or drugs for infection.  When we are infected with bacteria, we often run a fever, and it is known that body temperature might be important for our immune system.  TRPM2 might explain the mechanism through which fever boosts up our immune system. ”

This result was supported by Grant-in-Aid for Scientific Research from the MEXT, Japan.
 


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The above post is reprinted from materials provided by National Institute for Physiological Sciences. Note: Materials may be edited for content and length.


Journal Reference:

  1. Makiko Kashio, Takaaki Sokabe, Kenji Shintaku, Takayuki Uematsu, Naomi Fukuta, Noritada Kobayashi, Yasuo Mori, and Makoto Tominaga. Redox signal-mediated sensitization of transient receptor potential melastatin 2 (TRPM2) to temperature affects macrophage functions. Proceedings of the National Academy of Sciences., April 9, 2012 DOI: 10.1073/pnas.1114193109

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National Institute for Physiological Sciences. "Immune cells, 'macrophages' become activated by body temperature." ScienceDaily. ScienceDaily, 9 April 2012. <www.sciencedaily.com/releases/2012/04/120409164515.htm>.
National Institute for Physiological Sciences. (2012, April 9). Immune cells, 'macrophages' become activated by body temperature. ScienceDaily. Retrieved August 31, 2015 from www.sciencedaily.com/releases/2012/04/120409164515.htm
National Institute for Physiological Sciences. "Immune cells, 'macrophages' become activated by body temperature." ScienceDaily. www.sciencedaily.com/releases/2012/04/120409164515.htm (accessed August 31, 2015).

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