Surface HEI-OC1-Engineered Magnetic Nanoparticles with Antioxidant Coatings Mitigate Ototoxic Stress in HEI-OC1 Auditory 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)

Hearing loss represents a major global health challenge. Particularly, ototoxicity induced by cisplatin and aminoglycosides remains a significant clinical problem. In this study, we synthesized and characterized magnetite nanoparticles (Fe 3 O 4 ) functionalized with protocatechuic acid (Fe 3 O 4 @3,4-DHAB) and with protocatechuic acid plus sodium citrate (Fe 3 O 4 @3,4-DHAB@NaCitrate) and evaluated their effects on auditory House Ear Institute-Organ of Corti 1-(HEI-OC1) cells exposed to cisplatin and gentamicin. The nanoparticles exhibited good biocompatibility, maintaining a cell viability above 85% even at high concentrations. Functionalized formulations, particularly Fe 3 O 4 @3,4-DHAB, mitigated drug-induced loss of viability, preserved mitochondrial membrane potential, and reduced senescence-associated activity. These protective effects are consistent with the intrinsic antioxidant and anti-inflammatory properties of protocatechuic acid. Although limited to an in vitro model, our findings provide preliminary evidence that rational surface engineering of magnetic nanoparticles represents a viable strategy for mitigating ototoxic stress. This study builds upon our previous work demonstrating the role of PCA-functionalized Fe 3 O 4 nanoparticles in modulating immune responses and promoting interactions with adipose-derived stem cell phenotypes. Together, these results unders

Evidence level

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

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