Nanoparticles To Study Lectins in <i>Caenorhabditis elegans</i>: Multivalent Galactose β1-4 Fucose-Functionalized Dendrimers Provide Protection from Oxidative Stress
作者:Harrison W. VanKoten、Rebecca S. Moore、Mary J. Cloninger
DOI:10.1021/acs.biomac.1c01001
日期:2021.11.8
Galectins are galactoside-binding lectins that are functional dimers or higher-order oligomers. Multivalent binding has been shown to augment the relatively low affinity of the galectins for their galactoside-binding partners, enabling the galectins to play an important role in the global remodeling of cells that occurs during the stress conditions of disease states, including heart disease and cancer. The presence of galectins in the nematode Caenorhabditis elegans and their galactoside-binding properties have been demonstrated, but the role of multivalent interactions for C. elegans galectins is unknown. Here, we describe the synthesis of Galβ1-4Fuc-functionalized poly(amidoamine) dendrimers and their utility in studies using C. elegans during oxidative stress. C. elegans were fed Galβ1-4Fuc-functionalized dendrimers and RNA interference to knock down lectins lec-1 and lec-10 while undergoing oxidative stress. C. elegans that were pretreated with the glycodendrimers were less susceptible to oxidative stress than untreated controls. Worms that were fed fluorescently tagged glycodendrimers and imaged indicated that the dendrimers are primarily present in the digestive tract of the worms, and uptake into the vulva and proximal gonads could also be observed in some instances. This study suggests that multivalently presented Galβ1-4Fuc can protect C. elegans from oxidative stress.
半乳糖苷凝集素是半乳糖苷结合凝集素,是功能性二聚体或高阶寡聚体。研究表明,多价结合可增强半乳糖苷凝集素对其半乳糖苷结合伙伴相对较低的亲和力,从而使半乳糖苷凝集素在心脏病和癌症等疾病的应激状态下发生的细胞整体重塑中发挥重要作用。线虫秀丽隐杆线虫体内存在半乳糖苷,而且它们具有半乳糖苷结合特性,但多价相互作用对秀丽隐杆线虫半乳糖苷的作用尚不清楚。在此,我们介绍了 Galβ1-4Fuc 功能化聚(氨基胺)树枝状聚合物的合成及其在利用 elegans 进行氧化应激研究中的应用。给 elegans 喂食 Galβ1-4Fuc 功能化树枝状聚合物和 RNA 干扰,以敲除凝集素 lec-1 和 lec-10,同时让它们承受氧化应激。与未经处理的对照组相比,经糖化树枝状聚合物预处理的 elegans 对氧化应激的敏感性更低。用荧光标记的缩水甘油三聚体喂养蠕虫并对其成像表明,缩水甘油三聚体主要存在于蠕虫的消化道中,在某些情况下也能观察到外阴部和性腺近端摄取缩水甘油三聚体。这项研究表明,多价呈现的 Galβ1-4Fuc 可保护秀丽隐杆线虫免受氧化应激。