Characterizing Biomechanics of Limbal Niche Using Vibrational Optical Coherence Elastography.
Abstract
The limbal niche is an adult source of epithelial stem cells which regenerate the cornea epithelium. The architecture and biomechanical properties of the limbus have previously been demonstrated to change due to aging and disease. This study aims to non-destructively and simultaneously quantify these limbal niche properties, along with their age-related changes. A lab-built vibrational optical coherence elastography (OCE) device consisting of a phase-sensitive optical coherence tomography (OCT) with a vibrational stimulator has been used to collect structural images and the depth-resolved elasticity of human corneoscleral tissues (aged 4-96 years old). The limbal palisades of Vogt (POV) were delineated well in OCT images which were validated by histology. The POVs have been spatially mapped with simultaneous elasticity measurements in cross-sections, showing tissue stiffness distributions across the undulations. A significant influence of age on the dimensions of the POVs was explored. The elastic modulus within the limbal niches for the ≥65-year-old group was significantly higher than that of the <65-year-old group.
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Research summary
The paper investigates the biomechanical properties of the limbal niche and their age-related changes, which is relevant to understanding the aging process and its effects on stem cell sources in the eye. However, while it contributes to the knowledge of age-related changes in tissue properties, it does not directly address the root causes of aging or propose solutions for lifespan extension. Thus, its impact is limited to solid research without significant implications for the broader field of longevity.
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