The Deficiency of USP20 Alleviates Pressure Overload-Induced Cardiac Hypertrophy via the NF-κB Signaling Pathway

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Biochemistry

Background:

• Ubiquitin-specific protease 20 (USP20) is a deubiquitinating enzyme implicated in cellular signaling and disease.
• USP20 is upregulated in models of cardiac hypertrophy, suggesting a role in this condition.

Purpose of the Study:

• To investigate the role of USP20 in pressure overload-induced cardiac hypertrophy.
• To elucidate the molecular mechanisms by which USP20 influences cardiac hypertrophy.

Main Methods:

• Cardiac hypertrophy was induced in mice using transverse aortic constriction (TAC).
• USP20 was inhibited using shUSP20 adenovirus.
• In vitro studies utilized angiotensin II (AngII) to stimulate neonatal rat cardiomyocytes (NRCMs).
• NF-κB pathway activation and inflammatory markers were assessed.

Main Results:

• USP20 exacerbated TAC-induced cardiac hypertrophy, apoptosis, and inflammation.
• USP20 aggravated AngII-induced cardiomyocyte hypertrophy in vitro.
• USP20 increased pro-apoptotic (Bax) and inflammatory markers (TNF-α, IL-6, IL-1β) while decreasing anti-apoptotic Bcl2.
• USP20 elevated P65 phosphorylation, a key component of the NF-κB pathway.

Conclusions:

• USP20 plays a detrimental role in cardiac hypertrophy by promoting cardiomyocyte apoptosis and inflammation.
• USP20 exacerbates cardiac hypertrophy via the NF-κB signaling pathway.
• Targeting USP20 may represent a novel therapeutic approach for treating cardiac hypertrophy.