Inhibition of P2X7R Activation Ameliorates Damage to the Corneas and Corneal Nerves of Rats with Streptozotocin (STZ)-Induced Type 1 Diabetes.

IF 2 4区 医学 Q3 OPHTHALMOLOGY
Yuanyuan Qi, Qian Guo, Qi Li, Wanting Li, Wanjun Zhang, Shaozhen Zhao
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引用次数: 0

Abstract

Purpose: To investigate the effect of the P2X7 receptor (P2X7R) to the corneas and corneal nerves of rats with streptozotocin (STZ)-induced type 1 diabetes as well as the underlying mechanism.

Methods: In this study, male Wistar rats were first randomly divided into normal group (NL) and diabetes group (DM). After intraperitoneal injection of STZ, corneal perception, corneal fluorescein staining and the expression of P2X7R mRNA and protein in corneal tissues of NL and DM groups were detected before, 4, 6, 8, 12 and 16 weeks respectively. Then male Wistar rats were randomly divided into NL group, DM group and P2X7R inhibitor group (BBG). Start at 2 weeks after diabetes modeling, the BBG group was intraperitoneally injected with BBG every day. Corneal perception, corneal fluorescein staining, in vivo confocal microscopy, laser scanning confocal microscopy, corneal P2X7RmRNA levels, the mRNA levels of Brain-derived neurotrophic factor (BDNF), Glial cell-derived neurotrophic factor (GDNF), Nerve growth factor (NGF), Neuropeptide Y (NPY) and Growth associated protein-43(GAP-43) of corneal and trigeminal nerve were detected in the three groups at the 6th and 8th week.

Results: The mRNA and protein expression of P2X7R was significantly increased as early as 6 weeks after STZ injection and then showing a downward trend, but the corneal perception and corneal fluorescent staining continued to worse. Inhibition of P2X7R activation increased corneal sensitivity, ameliorated corneal epithelial damage, improved corneal subbasal nerve plexus density and length, increased the expression of BDNF in the trigeminal nerve and increased the expression of NPY in the corneal and trigeminal nerves.

Conclusions: The increase of P2X7R expression of diabetic rats was not synchronized with the gradually aggravated corneal injure. Inhibition of P2X7R activation can alleviate diabetes-associated corneal injury, regulate the expression of related neurotrophic factors and neuropeptides, and improve the corneal subbasal nerve plexus.

抑制P2X7R激活可改善链脲佐菌素(STZ)诱导的1型糖尿病大鼠角膜和角膜神经损伤
目的:探讨P2X7受体(P2X7R)对链脲佐菌素(STZ)诱导的1型糖尿病大鼠角膜和角膜神经的影响及其机制。方法:将雄性Wistar大鼠随机分为正常组(NL)和糖尿病组(DM)。腹腔注射STZ后,分别于4、6、8、12、16周检测NL组和DM组角膜组织的角膜感觉、角膜荧光素染色及P2X7R mRNA和蛋白的表达。将雄性Wistar大鼠随机分为NL组、DM组和P2X7R抑制剂组(BBG)。糖尿病造模后2周开始,BBG组每天腹腔注射BBG。检测角膜感知、角膜荧光素染色、活体共聚焦显微镜、激光扫描共聚焦显微镜、角膜P2X7RmRNA水平、角膜和三叉神经脑源性神经营养因子(BDNF)、胶质细胞源性神经营养因子(GDNF)、神经生长因子(NGF)、神经肽Y (NPY)和生长相关蛋白-43(GAP-43) mRNA水平。结果:早在STZ注射后6周,P2X7R mRNA和蛋白表达量就明显升高,随后呈下降趋势,但角膜知觉和角膜荧光染色持续变差。抑制P2X7R激活增加角膜敏感性,改善角膜上皮损伤,改善角膜基底下神经丛密度和长度,增加三叉神经中BDNF的表达,增加角膜和三叉神经中NPY的表达。结论:糖尿病大鼠P2X7R表达的增加与角膜损伤的逐渐加重不同步。抑制P2X7R激活可减轻糖尿病相关性角膜损伤,调节相关神经营养因子和神经肽的表达,改善角膜基底下神经丛。
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来源期刊
Current Eye Research
Current Eye Research 医学-眼科学
CiteScore
4.60
自引率
0.00%
发文量
163
审稿时长
12 months
期刊介绍: The principal aim of Current Eye Research is to provide rapid publication of full papers, short communications and mini-reviews, all high quality. Current Eye Research publishes articles encompassing all the areas of eye research. Subject areas include the following: clinical research, anatomy, physiology, biophysics, biochemistry, pharmacology, developmental biology, microbiology and immunology.
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