实验研究
ENGLISH ABSTRACT
新型纳米睫状神经营养因子复合物玻璃体腔注射对食蟹猴眼部的安全性——形态学评价
张天璐
刘一帆
沈吟
作者及单位信息
·
DOI: 10.3760/cma.j.cn115989-20220212-00052
Ocular safety of intravitreal injection of a novel nanoparticle ciliary neurotrophic factor complex in cynomolgus macaques——a morphological evaluation
Zhang Tianlu
Liu Yifan
Shen Yin
Authors Info & Affiliations
Zhang Tianlu
Eye Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
Liu Yifan
Eye Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
Shen Yin
Eye Center, Renmin Hospital of Wuhan University, Wuhan 430060, China
Medical Research Institute, Wuhan University, Wuhan 430071, China
·
DOI: 10.3760/cma.j.cn115989-20220212-00052
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摘要

目的评估一种新型纳米神经营养因子复合物(NP-CNTFs)在非人灵长类动物眼内应用的安全性。

方法利用纳米工艺制备包裹睫状神经营养因子(CNTF)的纳米粒。选取3只成年雄性食蟹猴,单眼玻璃体腔注射10 μl NP-CNTFs(1 μg/μl)作为NP-CNTFs组,对侧眼注射等体积磷酸盐缓冲液作为对照组。在注射前、注射后第3天和第7天,对食蟹猴行常规眼前节检查以评估结膜充血、前房闪辉及前房细胞等眼部症状并评分;采用彩色眼底照相观察眼底情况;采用频域光学相干断层扫描(SD-OCT)检测视网膜形态结构及厚度。

结果所制备NP-CNTFs粒径为(317±3)nm,多分散性指数为0.042±0.015,Zeta电位为(-38.9±0.7)mV,具备较好的稳定性、生物利用度和生物相容性。眼前节检查显示,NP-CNTFs组在注射后第3天表现出较对照组稍明显的结膜充血、前房闪辉和前房细胞,但在注射后第7天基本恢复正常。NP-CNTFs组与对照组注射后第3天眼前节症状评分分别为(2.67±0.88)和(1.00±0.58)分,注射后第7天分别为(0.67±0.33)和(0.33±0.33)分,组间比较差异均无统计学意义( t=2.50、1.00,均 P>0.05)。彩色眼底照相结果显示,NP-CNTFs组和对照组在注射后第7天眼底均正常,未见玻璃体混浊、玻璃体出血、视网膜出血或视盘水肿等异常改变。SD-OCT结果显示,NP-CNTFs组和对照组在注射后第7天均未见明显视网膜组织学改变。NP-CNTFs组和对照组视网膜神经纤维层厚度分别为(107.67±0.88)和(111.00±3.22)μm,黄斑中央凹厚度分别为(255.67±2.03)和(254.67±3.84)μm,组间比较差异均无统计学意义( t=1.43、0.50,均 P>0.05)。

结论新型纳米药物NP-CTNFs在食蟹猴眼内应用的安全性较好。

纳米粒;睫状神经营养因子;食蟹猴;安全性评估
ABSTRACT

ObjectiveTo evaluate the safety of a novel nanoparticle neurotrophic factor complex for intraocular application in non-human primates.

MethodsNanoparticles incorporated with ciliary neurotrophic factor (NP-CNTFs) were produced utilizing nanotechnology.Three adult male cynomolgus macaques were included and intravitreally injected with 10 μl NP-CNTFs at a concentration of 1 μg/μl into one of the two eyes, and these three eyes were designated as the NP-CNTFs group.The contralateral eyes received the same volume of phosphate buffered saline and were designated as the control group.Before the injection and on days 3 and 7 after the injection, routine clinical examinations of the anterior segment were performed to evaluate the ocular clinical symptoms such as conjunctival congestion, anterior chamber flare and cells.The fundus condition was observed by fundus photography.The morphological structure and thickness of retinas were detected by spectral domain-optical coherence tomography (SD-OCT).The use and care of animals were in accordance with the Guide for the Care and Use of Laboratory Animals issued by the National Institutes of Health and the standards of Association for Assessment and Accreditation of Laboratory Animal Care.The study protocol complied with the ethics of laboratory animal welfare and was approved by Hubei Topgene Biotechnology Co., Ltd.(No.IACUC-2019-012).

ResultsThe NP-CNTFs prepared in this study had a particle size of (317±3)nm, a polydispersity index of 0.042±0.015, and a zeta potential of (-38.9±0.7)mV, and exhibited relatively good stability, bioavailability, and biocompatibility.Clinical examinations revealed that the clinical manifestations of conjunctival congestion, anterior chamber flare and cells were slightly more obvious in the NP-CNTFs group at 3 days after injection compared to the control group, but basically returned to normal at 7 days after injection.The scores of anterior-segment clinical symptoms of the NP-CNTFs and control group were (2.67±0.88) and (1.00±0.58) at 3 days after injection, and (0.67±0.33) and (0.33±0.33) at 7 days after injection, respectively, with no statistical differences between them ( t=2.50, 1.00; both at P>0.05).Fundus photography showed normal fundus in both groups at 7 days after injection with no abnormal changes including vitreous opacity, vitreous hemorrhage, retinal hemorrhage or papilloedema.SD-OCT showed no significant histological changes in the retinas at 7 days after injection in both groups.The retinal nerve fiber layer thickness of the NP-CNTFs and control group were (107.67±0.88) and (111.00±3.22)μm, respectively, and the macular foveal thickness of the two groups were (255.67±2.03) and (254.67±3.84)μm, respectively, with no statistical differences between them ( t=1.43, 0.50; both at P>0.05).

ConclusionsThe complex NP-CNTFs shows good safety for intraocular application in cynomolgus macaques.

Nanoparticles;Ciliary neurotrophic factor;Cynomolgus macaques;Safety evaluation
Shen Yin, Email: nc.defudabe.uhwnehsniy
引用本文

张天璐,刘一帆,沈吟. 新型纳米睫状神经营养因子复合物玻璃体腔注射对食蟹猴眼部的安全性——形态学评价[J]. 中华实验眼科杂志,2024,42(07):613-620.

DOI:10.3760/cma.j.cn115989-20220212-00052

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视网膜退行性疾病是全世界致盲的主要原因之一,目前临床上尚无有效的预防和治疗方法 [ 1 , 2 , 3 ]。睫状神经营养因子(ciliary neurotrophic factor,CNTF)、脑源性神经营养因子、胶质细胞源性神经营养因子等在以视网膜神经节细胞损伤为主要表现的神经退行性疾病及遗传性视网膜退行性疾病中均表现出一定的神经保护作用,其中对于CNTF的研究尤为广泛 [ 4 , 5 , 6 , 7 ]。研究表明,CNTF可在视网膜变性过程中延缓光感受器细胞死亡,并促进视锥细胞外节再生;此外,其还通过影响视网膜色素上皮细胞的生理特性以及其他细胞因子/神经营养因子的分泌调节远端视网膜/视网膜色素上皮/Bruch膜复合体微环境,对视网膜组织表现出一定的保护作用 [ 7 , 8 , 9 ]。据报道,CNTF可降低视网膜退行性疾病动物模型中光感受器细胞死亡导致的视力丧失的发生率 [ 10 , 11 ]。然而,CNTF半衰期较短,治疗过程中需进行多次玻璃体腔注射以维持长期疗效,而多次注射引起眼内炎、视网膜脱离、视网膜血管阻塞等一系列严重并发症的发生风险增加 [ 12 , 13 ]。因此,寻求安全、长效的CNTF治疗方法至关重要。纳米粒作为一种新型药物递送载体,可实现缓释、控释和靶向给药,从多方面提高了药物治疗的安全性、有效性和可靠性。在众多纳米粒载体中,硫酸葡聚糖-壳聚糖纳米载体(dextran sulfate-chitosan nanoparticles,DSCS NPs)尤其适用于蛋白质类药物的递送 [ 14 ]。DSCS NPs可有效包裹并稳定治疗性多肽/蛋白质,提高药物生物利用度,增强治疗效果 [ 15 , 16 , 17 , 18 ]。将CNTF蛋白包裹于DSCS NPs中所制备的一种新型纳米睫状神经营养因子复合物(nanoparticles incorporated with ciliary neurotrophic factor,NP-CNTFs)可通过控制聚合物的性质和降解时间来调控药物的扩散,有望实现单次玻璃体腔注射即达到长效治疗效果。目前,NP-CNTFs玻璃体腔注射的眼部安全性尚不明确。本研究拟制备NP-CNTFs并观察其玻璃体腔注射后对食蟹猴眼部组织的短期影响,探索其应用于非人灵长类动物的眼部安全性,为开发基于纳米粒治疗视网膜退行性疾病的潜在药物提供实验基础。
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备注信息
A
沈吟,Email: nc.defudabe.uhwnehsniy
B

张天璐:实验设计、研究实施、数据采集、数据统计分析及文章撰写;刘一帆:研究实施及数据采集;沈吟:实验设计、文章审阅及定稿

C
所有作者均声明不存在利益冲突
D
感谢美国生物科技公司Hebecell在纳米药物制备方面提供的支持
E
政府间国际科技创新合作重点专项 (2017YFE0103400)
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