Impact of the controlled release of a connexin 43 peptide on corneal wound closure in an STZ model of type I diabetes.

Impact of the controlled release of a connexin 43 peptide on corneal wound closure in an STZ model of type I diabetes.
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DOI:
10.1371/journal.pone.0086570
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Potts JD
Potts JD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Moore K;Ghatnekar G;Gourdie RG;Potts JD

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α-羧基末端1(α CT 1)肽是一种合成产生的模拟物,由连接蛋白43(Cx43)的DDLEI C-末端序列修饰而成。以前使用各种伤口愈合模型的研究发现,在应用该药物时,有希望的治疗效果,导致伤口愈合率增加和疤痕减少。先前的数据表明体外代谢速率较快,因此对长期释放产生了兴趣。使用具有手术诱导的角膜损伤的链脲佐菌素(STZ)I型糖尿病大鼠模型,我们在普朗尼克凝胶溶液中直接递送α CT 1,并使用聚合藻酸盐-聚-L-鸟氨酸(A-PLO)微胶囊(MC)在持续系统中递送α CT 1。5天内伤口面积的荧光染色表明,α CT 1和α CT 1 MC给药组的伤口闭合率显著增加,其中α CT 1 MC组的伤口闭合速度最快。使用共聚焦定量和ELISA测定,对给药组的炎症反应分析表明干扰素诱导T细胞α趋化因子(ITAC)和肿瘤坏死因子α(TNFα)标志物的水平显著降低。使用RT-PCR和蛋白质印迹法对从EMT途径中选择的基因进行的其他分析表明,在14天的时间内,转化生长因子β 2(TGFβ2)、角蛋白8(Krt 8)、雌激素受体1(Esr 1)和葡萄糖转运蛋白4(Glut 4)的α CT 1修饰。总之,该数据表明α CT 1可能抑制炎症反应,导致伤口愈合率增加。
The alpha-carboxy terminus 1 (αCT1) peptide is a synthetically produced mimetic modified from the DDLEI C-terminus sequence of connexin 43 (Cx43). Previous research using various wound healing models have found promising therapeutic effects when applying the drug, resulting in increased wound healing rates and reduced scarring. Previous data suggested a rapid metabolism rate in vitro, creating an interest in long term release. Using a streptozotocin (STZ) type I diabetic rat model with a surgically induced corneal injury, we delivered αCT1 both directly, in a pluronic gel solution, and in a sustained system, using polymeric alginate-poly-l-ornithine (A-PLO) microcapsules (MC). Fluorescent staining of wound area over a 5 day period indicated a significant increase in wound closure rates for both αCT1 and αCT1 MC treated groups, withαCT1 MC groups showing the most rapid wound closure overall. Analysis of inflammatory reaction to the treatment groups indicated significantly lower levels of both Interferon Inducible T-Cell Alpha Chemoattractant (ITAC) and Tumor Necrosis Factor Alpha (TNFα) markers using confocal quantification and ELISA assays. Additional analysis examining genes selected from the EMT pathway using RT-PCR and Western blotting suggested αCT1 modification of Transforming Growth Factor Beta 2 (TGFβ2), Keratin 8 (Krt8), Estrogen Receptor 1 (Esr1), and Glucose Transporter 4 (Glut4) over a 14 day period. Combined, this data indicated a possible suppression of the inflammatory response by αCT1, leading to increased wound healing rates.
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