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Metal ion chelation enhances tissue plasminogen activator (tPA)-induced thrombolysis: an in vitro and in vivo study

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Abstract

Stroke is the third leading cause of death in the United States and the leading cause of adult disability. Despite enormous research efforts including many clinical trials, tissue plasminogen activator (tPA) remains the only FDA-approved treatment for acute ischemic stroke. Unfortunately, only 1–3% of stroke patients in the US receive this therapy because of the narrow time window and severe side effects for using tPA. The most deadly and damaging side effect is the risk of intracranial bleeding or hemorrhage. For that reason, the dose of tPA and its overall administration are under tight control, which may compromise the effect of thrombolysis. Studies have been focused on improving the effectiveness of tPA for higher rate of reperfusion, and the safety for less adverse bleeding episode. We studied how metal ions (zinc & iron) affect tPA-induced thrombolysis in vitro and in vivo, and proposed a method to improve the rate of thrombolysis. The amount of hemoglobin in the blood clot lysis was measured by a spectrophotometer. The tPA-induced thrombolysis was measured in vivo in femoral artery. Our results showed that Zn2+, Fe3+ and Fe2+ inhibited tPA-induced thrombolysis, with Zn2+ and Fe2+ being the most effective. Metal ion chelating agent EDTA when it was co-applied with tPA significantly enhanced the tPA-induced thrombolysis. The chelation alone did not have noticeable thrombolytic effect. In in vivo study of tPA-induced thrombosis following femoral artery thrombosis, the co-application of tPA and EDTA achieved significant higher rate of reperfusion than that by tPA treatment alone, suggesting that ion chelation facilitates tPA-induced thrombolysis and potentially improves the safety of tPA application by reducing the necessary dose of tPA application. Our results suggest that the co-application of a chelator and tPA improves the efficacy and, potentially, safety of tPA application, by reducing the necessary dose of tPA for thrombolysis.

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  1. Departments of Biological Science, College of Arts and Sciences, Ohio University, Athens, OH, USA

    Xinge Yu & Zihui Wang

  2. Department of Biomedical Sciences, Ohio Heritage College of Osteopathic Medicine, Ohio University, 346 Irvine Hall, Athens, OH, 45701, USA

    Xinge Yu, Zihui Wang & Yang V. Li

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XY and ZW researched data, contributed to the study design and discussion. XY performed statistical analyses and drafted the manuscript. YL conceived and coordinated the study. YL contributed to the study concept and design and writing of the manuscript. All authors approved the final version of the manuscript.

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Correspondence to Yang V. Li.

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Yu, X., Wang, Z. & Li, Y.V. Metal ion chelation enhances tissue plasminogen activator (tPA)-induced thrombolysis: an in vitro and in vivo study. J Thromb Thrombolysis 53, 291–301 (2022). https://doi.org/10.1007/s11239-021-02600-6

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