Folorunso Olufemi S, Sinha Nishant R, Singh Aastha, Xi Lei, Pulimamidi Vinay K, Cho WonKyung J, Mittal Sharad K, Chauhan Sunil K
Schepens Eye Research Institute of Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.
Schepens Eye Research Institute of Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.
Am J Pathol. 2025 Apr;195(4):754-769. doi: 10.1016/j.ajpath.2024.11.007. Epub 2024 Dec 26.
Tissue inhibitors of metalloproteinases (TIMPs) modulate extracellular matrix remodeling for maintaining homeostasis and promoting cell migration and proliferation. Pathologic conditions can alter TIMP homeostasis and aggravate disease progression. The roles of TIMPs have been studied in tissue-related disorders; however, their contributions to tissue repair during corneal injury are undefined. Here, the TIMP expression in human corneal epithelial cells under homeostatic and inflammatory milieus was profiled to examine their contribution to the healing of injured corneal epithelia. Transcriptionally, TIMP2 was highly expressed in human corneal epithelial cells when stimulated with 100 ng/mL IL1B or scratch wounded. Unlike TIMP1, recombinant TIMP2 (rTIMP2) significantly promoted epithelial cell wound closure compared with untreated and TIMP2-neutralizing conditions. At 12 hours, the Ki-67 cells significantly increased threefold in number compared with untreated cells, suggesting that rTIMP2 is associated with cell proliferation. Furthermore, rTIMP2 treatment significantly suppressed inflammatory cytokine expression (IL1B, IL6, IL8, and TNFA) and injury-induced matrix metalloproteinases (MMP1, MMP2, MMP3, MMP9, MMP10, and MMP13). Topical treatment of injured mouse cornea with 0.1 mg/mL rTIMP2 significantly promoted corneal re-epithelialization and improved tissue integrity. The treatment suppressed the expression of inflammatory cytokines and MMPs, as well as the infiltration of neutrophils at the injury site. These findings indicate that TIMP2 promotes faster wound healing by suppressing injury-induced inflammation and MMP expression, suggesting a potential therapeutic target for corneal wound management.
金属蛋白酶组织抑制剂(TIMPs)调节细胞外基质重塑以维持体内平衡,并促进细胞迁移和增殖。病理状况可改变TIMPs的体内平衡并加剧疾病进展。TIMPs在组织相关疾病中的作用已得到研究;然而,它们在角膜损伤期间对组织修复的贡献尚不清楚。在此,对人角膜上皮细胞在稳态和炎症环境下的TIMP表达进行了分析,以研究它们对受损角膜上皮愈合的贡献。在转录水平上,当用100 ng/mL白细胞介素1β(IL1B)刺激或划痕损伤时,TIMP2在人角膜上皮细胞中高表达。与TIMP1不同,与未处理和TIMP2中和条件相比,重组TIMP2(rTIMP2)显著促进上皮细胞伤口闭合。在12小时时,与未处理细胞相比,Ki-67细胞数量显著增加了两倍,表明rTIMP2与细胞增殖有关。此外,rTIMP2处理显著抑制炎症细胞因子表达(IL1B、IL6、IL8和肿瘤坏死因子α(TNFA))以及损伤诱导的基质金属蛋白酶(MMP1、MMP2、MMP3、MMP9、MMP10和MMP13)。用0.1 mg/mL rTIMP2局部治疗受伤的小鼠角膜可显著促进角膜再上皮化并改善组织完整性。该治疗抑制了炎症细胞因子和基质金属蛋白酶的表达,以及损伤部位中性粒细胞的浸润。这些发现表明,TIMP2通过抑制损伤诱导的炎症和基质金属蛋白酶表达促进更快的伤口愈合,提示其可能是角膜伤口处理的潜在治疗靶点。
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