PNAS:服用超长链多不饱和脂肪酸可显著改善视觉和视网膜功能!

2021-02-25 生物探索 生物探索

补充VLC-PUFA可改善其视觉功能。

油酸等单不饱和脂肪酸(MUFA)和亚油酸、亚麻酸等多不饱和脂肪酸(PUFA)是对人体健康极为重要的必需脂肪酸,其可以保持细胞膜的相对流动性、降低血液中的胆固醇和甘油三酯,同时也是大脑和神经的重要营养成分。

有研究发现,在脊椎动物中还存在一种长于26个碳原子的超长链多不饱和脂肪酸(VLC-PUFA),其同时具有MUFA和PUFA的特征。由于该VLC-PUFA仅在视网膜和某些组织中合成,科学家们猜测,其可能在视网膜变性和发育以及维持视力中起着重要作用。

近日,来自美国犹他州大学的研究人员在《PNAS》上发表了题为Retinal bioavailability and functional effects of a synthetic very-long-chain polyunsaturated fatty acid in mice的研究成果,其首次开发了一种大量合成VLC-PUFA的方法,明确发现了补充VLC-PUFA可以增加正常小鼠和ELOVL4酶缺陷小鼠的视网膜脂质水平,并改善其视觉功能。

前期研究发现,VLC-PUFA是通过一种称为ELOVL4的酶在视网膜中催化二十碳五烯酸(EPA)和花生四烯酸等特定前体延伸而合成的。而ELOVL4的遗传缺陷常会导致双眼渐进性的中心视力下降、视网膜上皮色素和眼底黄斑萎缩、偶伴有眼底黄色斑点等表型的早发性黄斑营养不良性疾病(STGD3)的发生。

研究人员猜测,如果STGD3或年龄相关的黄斑变性患者摄入足够量的VLC-PUFA,那么这些VLC-PUFA或许可以运输到视网膜中使用,避免ELOVL4酶介导的脂质延长缺陷,并延迟或防止视网膜变性。

由于VLC-PUFA仅在人体中少量合成,与前人止步于无法获取纯且大量的VLC-PUFA不同,研究人员开发了一种以DHA(22:6 n-3)为底物可高达15%产率的无毒合成方法,其可以按投入比例放大产量,且能轻松对其进行修饰以生成多种n-3和n-6生理相关的VLC-PUFAs。研究人员使用了核磁共振,红外和质谱(MS)对该方法合成的VLC-PUFA(32:6 n-3)进行了确认,并通过气相色谱-MS(GC-MS)分析检测了其纯度大于98%。

VLC-PUFA(32:6 n-3)的合成

为了明确其在视网膜发展中的作用,研究人员首先使用6 mg/d和1或2mg/d 的VLC-PUFA(32:6 n-3)对小鼠进行单剂量和重复剂量饲喂以了解其吸收动力学。结果发现,无论是单剂量还是重复剂量饲喂,小鼠的视网膜及其色素上皮层(RPE)中该物质的含量均表现出明显增加,且随服用剂量和时间的增加更显着,血清、红细胞(RBC)大脑中并未检测到该物质。此外,服用VLC-PUFA(32:6 n-3)的小鼠并无任何毒副作用。

之后,研究人员使用视网膜电图(ERG)和视动力反应(OKR)对对照组和2 mg / d的长期喂养组小鼠的视觉进行了检测,发现VLC-PUFA(32:6 n-3)的补充显着改善了小鼠的视网膜功能和视觉,处理组小鼠的暗视和明视视敏度要远优于对照组。

WT小鼠长期饲喂VLC-PUFA(32:6 n-3)后的ERG反应

WT小鼠长期饲喂VLC-PUFA(32:6 n-3)后的OKR研究

为了进一步确认其在视网膜中的功能,研究人员还使用VLC-PUFA(32:6 n-3)处理了E4cKO小鼠,即完全消除了ELOVL4表达的敲除小鼠。各项检测结果表明,对E4cKO小鼠处理后,其视网膜和RPE中的VLC-PUFA(32:6 n-3)分别增加了5倍和27倍,总视网膜VLC-PUFAs达到了野生型小鼠水平,而E4cKO小鼠仅可检测到一半的暗视a波和b波,以及无明视信号的表型,经补充VLC-PUFA(32:6 n-3)后也均得到了显着改善。

E4cKO小鼠补充VLC-PUFA(32:6 n-3)后的ERG

该研究的通讯作者Paul S. Bernstein表示:“合成VLC-PUFAs开辟了一个全新的研究领域,我们确定了补充VLC-PUFA可以增加小鼠的视网膜脂质水平,并改善其视觉功能,这是令人兴奋的第一步。关于口服VLC-PUFA如何改善视力,它们如何在血流中携带以及选择性地靶向视网膜,VLC-PUFA的配方,剂量和服用时间的优化等多个有趣的问题,还需要我们进一步开展研究。”

原始出处:

Aruna Gorusupudi, Rameshu Rallabandi, Binxing Li,et al. Retinal bioavailability and functional effects of a synthetic very-long-chain polyunsaturated fatty acid in mice. Proc Natl Acad Sci USA February 9, 2021 118 (6) e2017739118; https://doiorg/10.1073/pnas.2017739118.

 

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    2021-12-27 drwjr
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    2021-03-05 1e11296fm18(暂无匿称)

    👏👏

    0

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    2021-02-27 zutt
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    2021-02-27 zywlvao
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    2021-02-26 ms7000001204488220

    学习

    0

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阿尔茨海默病是一种常见的神经退行性疾病,也是导致痴呆的主要原因。阿尔茨海默病患者认知能力会下降,然而其分子病理则开始于出现临床症状前数十年,因此迫切需要发现在阿尔茨海默病早期具有高敏感度的生物标志物。

Neuron:视网膜发育中基因组三维结构变化

尽管DNA双螺旋结构被大家熟知,但是人类基因组的物理结构远比双螺旋复杂:总长近2米的DNA长链,在组蛋白,以及cohesin和CTCF等蛋白的帮助下被一步步压缩,包装成染色体结构,进而能被细胞核容纳。在这个过程中,DNA一维结构中相距较远的区域可能通过染色质环状结构(chromatin looping)在三维结构中反而比较接近,从而达到增强子远程调控的作用。但是这个包装过程的关键细节在很大程度上还

Curr Eye Res:重建视网膜-穆勒胶质细胞介导的自我修复的前景

伦敦大学学院眼科研究所的朗格R 和皮尔逊RA等人近日在Curr Eye Res杂志上发表了一篇综述文章,系统性的介绍了目前穆勒胶质细胞在视网膜再生过程中的最新研究进展。

NEJM:钝性眼外伤引起的视网膜出血-病例报道

该患者进行了带内填塞的平面玻璃体切除术。在为期8周的随访中,患者右眼的视力提高到20/30,眼底检查显示视网膜出血有所缓解,中央凹反射正常。

Nature BME:通过测量视网膜血管口径评估心血管疾病风险的深度学习系统

一个多世纪以来,医生们对高血压患者进行眼底检查,以确定视网膜血管损伤的存在和严重程度,以此来评估心血管疾病(CVD)的风险。这项检查的前提是,视网膜血管系统中观察到的变化,如视网膜小动脉狭窄程度,反映