The Role Played by Transcription Factor E3 in Modulating Cardiac Hypertrophy

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Cellular Signaling

Background:

• Transcription factor E3 (TFE3) regulates cellular adaptation and is implicated in cardiac hypertrophy.
• TFE3 expression is elevated in cardiac hypertrophy, but its precise role remains unclear.

Purpose of the Study:

• To investigate the role of TFE3 in pressure-overload-induced cardiac hypertrophy.
• To elucidate the molecular mechanisms by which TFE3 influences cardiac function and hypertrophy.

Main Methods:

• Induction of pressure-overload cardiac hypertrophy via transverse aortic constriction (TAC) in wild-type and TFE3 knockout mice.
• Assessment of cardiac function (ejection fraction, fractional shortening) and molecular markers (Myh7, ERK phosphorylation) in mouse models and human heart tissues.
• In vitro studies using H9c2 cell line to explore TFE3-ERK interactions and downstream effects.

Main Results:

• TFE3 knockout mice exhibited preserved cardiac function compared to wild-type mice after TAC.
• TFE3 knockout mice showed reduced Myh7 expression and increased ERK phosphorylation post-TAC.
• TFE3, histone, and MYH7 were upregulated, while pERK was downregulated in hypertensive human hearts and TFE3-manipulated cells.

Conclusions:

• TFE3 expression is increased in cardiac hypertrophy, suggesting a detrimental role.
• TFE3 appears to mediate cardiac hypertrophy through a signaling cascade involving histone, MYH7, and pERK.
• Targeting the TFE3-histone-MYH7-pERK pathway may offer therapeutic potential for cardiac hypertrophy.