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Area of Science:

  • Metabolic research
  • Neuroendocrinology
  • Light biology

Background:

  • Mammals utilize light-sensing photoreceptors in multiple organs.
  • Opsin3 is notably abundant in adipose tissue, facilitating inter-organ communication, especially with the brain via the sympathetic nervous system (SNS).

Purpose of the Study:

  • To investigate the novel light-triggered crosstalk between adipose tissue and the hypothalamus.
  • To explore the role of Opsin3 in mediating metabolic responses to light.

Main Methods:

  • Direct blue-light exposure to subcutaneous white fat in a high-fat diet model.
  • Metabolomic analysis to identify key signaling molecules.
  • Investigation of the sympathetic nervous system (SNS) pathway involving histidine and the hypothalamus.
  • Cell-autonomous studies on human white adipocytes.

Main Results:

  • Blue light exposure to white fat ameliorated diet-induced metabolic dysfunction in an Opsin3-dependent manner.
  • Metabolomics revealed increased histidine levels, which activated hypothalamic histaminergic neurons.
  • This activation stimulated brown adipose tissue (BAT) through the SNS.
  • Blocking histidine's central effects or denervating BAT abolished the benefits of blue light.
  • Human white adipocytes demonstrated cell-autonomous responses to blue light.

Conclusions:

  • A novel light-responsive metabolic circuit exists between adipose tissue and the hypothalamus.
  • This pathway, mediated by Opsin3 and histidine, offers a potential therapeutic strategy for obesity-related metabolic disorders.