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Stressful memories.

Annalisa M VanHook1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|October 26, 2021
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Summary
This summary is machine-generated.

Signal transducer and activator of transcription 3 (STAT3), FOS, and JUN proteins work together to create lasting inflammatory memory in skin stem cells. This memory can be reawakened, influencing future skin responses.

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Area of Science:

  • Cellular biology
  • Immunology
  • Dermatology

Background:

  • Inflammatory memory is crucial for adaptive immunity but its mechanisms in tissue-resident stem cells are poorly understood.
  • Epidermal stem cells play a key role in skin homeostasis and repair.
  • Dysregulation of inflammation contributes to various skin diseases.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying inflammatory memory in epidermal stem cells.
  • To identify key transcription factors involved in establishing and maintaining this memory.
  • To explore how inflammatory memory can be reactivated in epidermal stem cells.

Main Methods:

  • Utilized single-cell RNA sequencing to analyze gene expression changes in epidermal stem cells following inflammatory stimuli.
  • Employed chromatin immunoprecipitation sequencing (ChIP-seq) to identify binding sites of STAT3, FOS, and JUN.
  • Performed functional assays to assess the role of these transcription factors in regulating inflammatory memory.

Main Results:

  • STAT3, FOS, and JUN were identified as key cooperating factors in epidermal stem cells.
  • These factors establish a persistent epigenetic state associated with inflammatory memory.
  • Reactivation of STAT3, FOS, and JUN signaling pathways was shown to reawaken inflammatory memory.

Conclusions:

  • STAT3, FOS, and JUN form a regulatory network essential for inflammatory memory in epidermal stem cells.
  • This network enables epidermal stem cells to 'remember' past inflammatory events.
  • Understanding this mechanism could offer new therapeutic targets for inflammatory skin conditions.