Mechanisms of vitamin A deprivation and replacement therapy

项目摘要/摘要 维生素A对人类健康和视力至关重要。维生素A摄取不足严重损害人体健康 光感受器，导致视觉色素的丧失，是可预防的主要原因 根据世界卫生组织的说法，儿童失明。然而，关于维生素A是如何 剥夺在分子水平上影响光感受器以及维生素A替代疗法如何 调节结构和功能的光感受器恢复。我们的长期目标是利用 以黑腹果蝇视网膜为模型来填补我们这一知识空白，并分析 潜在的机制。 这一建议协同结合了果蝇遗传学、免疫组织化学、行为学 分析和定量蛋白质组学。这种多学科的方法将使我们能够评估 中心假设不同类型的光感受器在功能上等同于人类视杆 和锥体-对维生素A缺乏的反应不同，维生素A缺乏会触发 稳定受损光感受器的保护机制。我们将推进三大举措 明确的目标。首先，我们将分析不同类型的光感受器对维生素A的反应 剥夺。其次，我们试图确定受影响的蛋白质和细胞通路 维生素A缺乏和维生素A替代疗法。第三，我们将确定 我们发现一种新的跨膜蛋白，在缺乏维生素A的情况下高度上调 视网膜来稳定受损的光感受器。 这项拟议的研究意义重大，因为它将提供对分子的基本见解。 不同类型光感受器对维生素A缺乏的反应。它还将揭开维他命是如何 替代疗法可改善光感受器的结构和功能。总而言之， 这一建议有可能确定稳定受损的光感受器和 为治疗人类眼病开辟新的途径。

Project Summary/Abstract Vitamin A is critical for human health and vision. Insufficient uptake of vitamin A severely damages photoreceptors, causes a loss of visual pigments, and is the leading cause of preventable childhood blindness according to the WHO. However, little is known about how vitamin A deprivation affects photoreceptors on the molecular level and how vitamin A replacement therapy mediates structural and functional photoreceptor recovery. Our long-term goal is to use the Drosophila melanogaster retina as a model to fill this gap in our knowledge and to analyze the underlying mechanisms. This proposal synergistically combines Drosophila genetics, immunohistochemistry, behavioral analysis, and quantitative proteomics. This multidisciplinary approach will allow us to evaluate the central hypotheses that different photoreceptor types – functionally equivalent to human rods and cones - respond differently to vitamin A deprivation and that vitamin A deficiency triggers protective mechanisms that stabilize damaged photoreceptors. We will pursue three major specific aims. First, we will analyze how different photoreceptor types respond to vitamin A deprivation. Second, we seek to identify the proteins and cellular pathways that are affected by vitamin A deprivation and vitamin A replacement therapy. Third, we will determine the function of a novel transmembrane protein that we found to be highly upregulated in vitamin A-deprived retinas to stabilize the damaged photoreceptors. The proposed research is significant, as it will provide fundamental insights into the molecular response of different photoreceptor types to vitamin A deprivation. It will also unravel how vitamin A replacement therapy leads to improvement of photoreceptor structure and function. Collectively, this proposal has the potential to identify mechanisms that stabilize damaged photoreceptors and to open new avenues for treating human eye diseases.