The Hippo Pathway: Biology and Pathophysiology

Area of Science:

• Cell Biology
• Developmental Biology
• Biochemistry

Background:

• The Hippo pathway is an evolutionarily conserved signaling cascade.
• It regulates fundamental biological processes like cell growth, organ size, and regeneration.
• Key components include MST1/2, LATS1/2 kinases, and YAP/TAZ transcriptional coactivators.

Purpose of the Study:

• To review the molecular mechanisms by which signals regulate the Hippo pathway.
• To emphasize the role of mechanotransduction in Hippo pathway regulation.
• To discuss the Hippo pathway's impact on basic biology and human diseases.

Main Methods:

• Literature review of the Hippo pathway.
• Focus on signaling mechanisms, including mechanotransduction.
• Analysis of Hippo pathway's role in biological processes and diseases.

Main Results:

• The Hippo pathway's core components (MST1/2, LATS1/2, YAP, TAZ) control cell proliferation, survival, stemness, and differentiation.
• Numerous intrinsic and extrinsic signals (mechanical force, cell-cell contact, energy status, hormones) regulate the pathway.
• G protein-coupled receptors are involved in mediating hormonal signals.

Conclusions:

• The Hippo pathway is a critical regulator of organ size and tissue homeostasis.
• Dysregulation of the Hippo pathway is implicated in various human diseases.
• Understanding Hippo pathway signaling, particularly mechanotransduction, is crucial for therapeutic development.