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The Hippo signal transduction network for exercise physiologists.

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The Hippo pathway, regulated by Yap (Yap1) and Taz (Wwtr1) proteins, is influenced by exercise. This signaling impacts organ adaptations, muscle growth, and even body height, a factor in sports.

Keywords:
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Area of Science:

  • Molecular Biology
  • Exercise Physiology
  • Cell Signaling

Background:

  • The transcriptional coactivators Yap (Yap1) and Taz (Wwtr1) are central to the Hippo signaling network.
  • Yap and Taz regulate gene expression primarily by coactivating Tead transcription factors.
  • Hippo signaling is modulated by various exercise-associated signals, including mechanotransduction, metabolic pathways, and hormonal cues.

Purpose of the Study:

  • To explore how exercise influences Hippo signaling.
  • To understand the role of Hippo pathway members in exercise-induced organ adaptations.
  • To investigate the link between Hippo pathway genes and human traits relevant to sports.

Main Methods:

  • Review of existing literature on Hippo signaling and exercise.
  • Analysis of studies investigating Tead1 overexpression in muscle fibers.
  • Examination of genome-wide association studies linking Hippo pathway genes to human traits.

Main Results:

  • Exercise significantly impacts Hippo signaling across multiple organs.
  • Tead1 overexpression in muscle fibers induces a fast-to-slow fiber type switch.
  • Yap in muscle and cardiomyocytes promotes skeletal muscle hypertrophy and cardiac adaptations.
  • Human genetic studies associate Hippo pathway genes (LATS2, TEAD1, YAP1, VGLLs) with body height.

Conclusions:

  • Exercise-induced alterations in Hippo signaling contribute to organ-specific adaptations.
  • The Yap/Taz-Tead axis plays a crucial role in mediating exercise benefits in muscle and the heart.
  • Genetic variations in the Hippo pathway may influence athletic potential through traits like body height.