Age-associated proteomic alterations in human aortic media.

Area of Science:

• Vascular Biology
• Aging Research
• Proteomics

Background:

• Human vascular senescence, primarily in the aortic media, is not fully understood.
• Aging is associated with molecular changes in the vasculature.

Purpose of the Study:

• To investigate age-associated proteomic changes in human aortic media.
• To elucidate molecular mechanisms underlying vascular senescence.

Main Methods:

• Proteomic analysis using two-dimensional differential gel electrophoresis and isobaric tags for relative and absolute quantitation.
• Analysis of aortic media from young, middle-aged, and older-aged individuals.
• Immunohistochemical analysis of differentially expressed proteins.

Main Results:

• Elevated lactadherin expression in older aortic media, associated with medin production.
• Increased deposition of lactadherin and apolipoprotein E, with enhanced amyloidosis in older individuals.
• Elevated markers of oxidative damage (8-hydroxy-2'-deoxyguanosine, 4-hydroxy-2-nonenal) and increased antioxidant proteins (thioredoxin, extracellular superoxide dismutase) with aging.
• Decreased alpha-actin and altered extracellular matrix proteins, suggesting smooth muscle cell disruption and matrix remodeling.

Conclusions:

• Elevated lactadherin expression may drive amyloid deposition, oxidative stress, and matrix remodeling in aged aortic media.
• Proteomic insights into vascular senescence provide a foundation for understanding age-related cardiovascular changes.