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Area postrema neurons mediate interleukin-6 function in cancer cachexia.

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Interleukin-6 (IL-6) in the brainstem area postrema (AP) drives cancer cachexia. Targeting IL-6 signaling in AP neurons alleviates symptoms and extends lifespan in mice.

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Area of Science:

  • Neuroscience
  • Oncology
  • Physiology

Background:

  • Interleukin-6 (IL-6) is implicated in cancer cachexia, a wasting syndrome.
  • The precise mechanism by which peripheral IL-6 affects the brain to cause cachexia is unclear.

Purpose of the Study:

  • To investigate the role of the area postrema (AP) in mediating IL-6 effects in cancer cachexia.
  • To identify therapeutic targets for cancer cachexia.

Main Methods:

  • Used male mice with peripheral tumors.
  • Administered anti-IL-6 antibodies and employed CRISPR/dCas9 interference and Gfral neuron silencing in the AP.
  • Measured IL-6 levels, synaptic transmission, network activity, cachectic phenotypes, and lifespan.

Main Results:

  • Circulating IL-6 rapidly enters the AP and activates its neurons.
  • Tumor-induced IL-6 increases IL-6 in the AP, potentiating synaptic transmission and causing network hyperactivity.
  • Neutralizing IL-6 in the brain, suppressing IL-6 receptor (Il6ra) in AP neurons, or silencing Gfral-expressing AP neurons attenuated cachexia, reduced AP network hyperactivity, and prolonged lifespan.

Conclusions:

  • Neurons in the AP are critical mediators of IL-6-induced cancer cachexia.
  • Targeting IL-6 signaling within the AP offers a potential therapeutic strategy for cancer cachexia.