Small Extracellular Vesicles Have GST Activity and Ameliorate Senescence-Related Tissue Damage

Area of Science:

• Gerontology
• Cellular Biology
• Biochemistry

Background:

• Aging is characterized by cellular and tissue dysfunction, including cellular senescence.
• Certain aging and senescence features can be reversed or ameliorated.
• Small extracellular vesicles (sEVs) are investigated for their potential therapeutic roles.

Purpose of the Study:

• To investigate the potential of young human fibroblast-derived small extracellular vesicles (sEVs) in ameliorating senescence biomarkers.
• To elucidate the mechanism by which sEVs exert their anti-aging effects.
• To evaluate the therapeutic efficacy of sEVs in vivo.

Main Methods:

• Isolation of sEVs from primary fibroblasts of young human donors.
• Treatment of senescent cells from old and Hutchinson-Gilford progeria syndrome donors with young sEVs.
• Administration of young sEVs to old mice to assess tissue-level effects.
• Analysis of sEVs' enzymatic activity, specifically glutathione-S-transferase (GST).
• Measurement of oxidative stress markers, reduced glutathione levels, and lipid peroxidation.

Main Results:

• sEVs from young donors ameliorated senescence biomarkers in aged and progeria cells.
• Young sEVs improved senescence markers across various tissues in old mice.
• sEVs demonstrated intrinsic glutathione-S-transferase activity, linked to high GSTM2 expression.
• Recombinant GSTM2 transfer into old sEVs restored their antioxidant capacity.
• sEVs increased reduced glutathione and decreased oxidative stress and lipid peroxidation in vitro and in vivo.

Conclusions:

• Young fibroblast-derived sEVs possess the capacity to ameliorate aging and senescence hallmarks.
• The antioxidant activity of sEVs, mediated by GSTM2, is a key mechanism in their regenerative potential.
• sEVs show promise as a novel regenerative therapy for aging and age-related conditions.