Characterization of exosomes from hypoxia-activated human amniotic membrane mesenchymal stem cells

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Objectives Hypoxia is a physical stimulus that enhances stem cell activities to produce more cellular derivatives, particularly exosomes. Enhancing the quantity and quality of exosomes can improve their therapeutic properties. The study aimed to evaluate the effects of normoxic (22%O 2 ) and hypoxic (1%O 2 ) conditions on the characteristics of amniotic membrane-derived mesenchymal stem cells (AM-MSCs) and their exosomes. Materials and methods AM-MSCs were isolated, confirmed, and cultured under normoxic and hypoxic conditions. Exosomes were extracted from AM-MSCs and assessed for morphological characteristics (size/distribution/surface topography), structural properties (aggregation/colloidal particle behavior/surface charge/stability), chemical features (functional groups/ionic interactions), biological capacities (total protein concentration), and biocompatibility (microbiological quality/cytotoxicity/irritation/sensitization). Results Hypoxia did not adversely affect the stemness potential of AM-MSCs ( P >0.05). The average sizes of exosomes derived from AM-MSCs (AM-MSCs-Exo) were 185.7±23 nm (PI=0.756) and 145.4±36 nm (PI=0.420) under normoxic and hypoxic conditions, respectively ( P ≤0.05). Zeta potential of AM-MSCs-Exo was -12.57±0.5 mV under normoxia, while it was -2.37±0.73 mV in the hypoxic conditions. Exosomes from hypoxia-treated cells exhibited greater uniformity,

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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