Trioxidized cysteine and aging: a molecular binomial that extends far beyond classical proteinopathic paradigms

Area of Science:

• Biochemistry
• Molecular Biology
• Gerontology

Background:

• Oxidative stress (OS) and antioxidant imbalance are hallmarks of unhealthy aging.
• OS induces oxidative posttranslational modifications (PTMs), including trioxidized cysteine (t-Cys), causing permanent protein damage.
• t-Cys dysregulation in aging proteomes disrupts phosphorylation signaling, mimicking serine phosphorylation alterations.

Purpose of the Study:

• To contextualize the implications and molecular roles of t-Cys in the aging proteome.
• To present novel data validating increased t-Cys sites in the aging human proteome.
• To explore t-Cys as potential mechanistic and biological markers for unhealthy aging.

Main Methods:

• Review and contextualization of existing findings on t-Cys in aging.
• Analysis of novel data on t-Cys site alterations in the aging human proteome.
• Validation of specific t-Cys sites associated with aging in circulating blood proteomes.

Main Results:

• t-Cys residues are increased in specific sites within the aging human blood proteome.
• The findings support the role of t-Cys in protein damage and altered signaling during aging.
• Specific t-Cys sites are identified as potentially age-associated.

Conclusions:

• t-Cys residues play a significant role in the molecular pathology of aging.
• Increased t-Cys in the circulating proteome may serve as a biomarker for unhealthy aging.
• Further research into t-Cys is warranted for understanding age-related diseases.