Altered Glycosylation in the Aging Heart

Area of Science:

• Biochemistry
• Cardiovascular Science
• Aging Research

Background:

• Cardiovascular disease is a leading cause of death, with aging as a primary risk factor.
• Aged hearts exhibit cardiac hypertrophy, fibrosis, and inflammation, but molecular mechanisms remain unclear.
• Protein glycosylation, a key post-translational modification, influences protein function and biological properties.

Purpose of the Study:

• To investigate age-related changes in the cardiac glycoproteome.
• To identify specific alterations in protein glycosylation patterns in the aging heart.
• To explore the functional implications of these glycomic changes on cardiovascular health.

Main Methods:

• Analysis of cardiac glycoproteome in mice of different ages.
• Western blot and MALDI-TOF based glycome analysis.
• Quantitative mass spectrometry of cardiac glycoproteins.

Main Results:

• A significant increase in high-mannose N-glycans was observed with aging.
• Age-related regulation of GMPPB, an enzyme involved in GDP-mannose supply, was identified.
• Widespread alterations in cardiac glycoproteins were detected, particularly in extracellular matrix and Ca2+-binding proteins.

Conclusions:

• The study provides the first comprehensive analysis of the aging cardiac glycoproteome.
• Age-associated changes in glycosylation, especially high-mannose N-glycans, are evident in the heart.
• Alterations in the cardiac glycoproteome are proposed to contribute to age-related cardiovascular functional decline.