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Published on: September 13, 2018
Regulation of Myocardial Cell Growth and Death by the Hippo Pathway
Shohei Ikeda1, Junichi Sadoshima
1Department of Cell Biology and Molecular Medicine, Rutgers - New Jersey Medical School.
Insights
The Hippo pathway, particularly Yes-associated protein (Yap), is crucial for cardiomyocyte survival and regeneration. Understanding its role offers new avenues for treating heart failure and promoting cardiac repair after injury.
Area of Science:
- Cardiovascular Biology
- Molecular Signaling
- Regenerative Medicine
Background:
- Heart failure results from cardiomyocyte loss, impacting clinical mortality.
- Cardiomyocyte survival and regeneration are key therapeutic targets for heart failure.
- The Hippo pathway regulates organ size by controlling apoptosis and proliferation.
Purpose of the Study:
- To review the current understanding of the Hippo pathway's function in the heart.
- To emphasize the specific role of Yes-associated protein (Yap) in cardiomyocyte growth and death.
- To explore Yap's potential in promoting cardiac regeneration after myocardial infarction.
Main Methods:
- Literature review of studies on the Hippo pathway and its components in cardiac research.
- Analysis of evidence linking Yes-associated protein (Yap) to cardiomyocyte survival, proliferation, and hypertrophy.
- Synthesis of findings on Yap's role in cardiac repair mechanisms.
Main Results:
- The Hippo pathway, including Mst1/2, Lats1/2, and Yap, is present and active in the mammalian heart.
- Yes-associated protein (Yap) is a critical downstream effector of the Hippo pathway in cardiomyocytes.
- Evidence indicates Yap promotes cardiomyocyte survival and proliferation/hypertrophy, and facilitates cardiac regeneration.
Conclusions:
- The Hippo pathway, especially Yap, plays a significant role in regulating cardiomyocyte homeostasis.
- Targeting Yap may offer a therapeutic strategy to enhance cardiac repair and combat heart failure.
- Further research into the Hippo pathway's cardiac functions is warranted for developing novel treatments.
Abstract:
Stress in the heart causes loss of cardiomyocytes (CMs), the accumulation of which leads to heart failure, a major cause of clinical mortality. The improvement of CM survival and facilitation of CM regeneration are major goals in treatment for heart failure. The Hippo pathway is an evolutionarily conserved signaling mechanism that regulates organ size by controlling both apoptosis and cell proliferation. The main components of the Hippo pathway, including Mst1/2, Lats1/2 and Yes-associated protein (Yap), are present in the mammalian heart and play an important role in regulating the growth and death of CMs. Recent research in the cardiac field has demonstrated that Yap, a key downstream transcriptional cofactor in the Hippo signaling pathway, plays a crucial role in regulating survival and proliferation/hypertrophy of CMs. Increasing lines of evidence suggest that Yap promotes regeneration of the heart after myocardial infarction. In this review, we summarize the current knowledge regarding the roles and functions of the Hippo pathway in the heart, with a particular emphasis on the role of Yap in regulating growth and death of CMs. (Circ J 2016; 80: 1511-1519).
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