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Florova G, Girard RA, Azghani AO, Sarva K, Buchanan A, Karandashova S, DeVera CJ, Morris D, Chamiso M, Koenig K, Cines DB, Idell S, Komissarov AA. Precision targeting of the plasminogen activator inhibitor-1 mechanism increases efficacy of fibrinolytic therapy in empyema. Physiol Rep 2021; 9:e14861. [PMID: 33991465 PMCID: PMC8123555 DOI: 10.14814/phy2.14861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 04/11/2021] [Indexed: 01/10/2023] Open
Abstract
Plasminogen activator inhibitor‐1 (PAI‐1) is an endogenous irreversible inhibitor of tissue‐type (tPA) and urokinase (uPA) plasminogen activators. PAI‐1‐targeted fibrinolytic therapy (PAI‐1‐TFT) is designed to decrease the therapeutic dose of tPA and uPA, attenuating the risk of bleeding and other complications. Docking site peptide (DSP) mimics the part of the PAI‐1 reactive center loop that interacts with plasminogen activators, thereby affecting the PAI‐1 mechanism. We used DSP for PAI‐1‐TFT in two rabbit models: chemically induced pleural injury and Streptococcus pneumoniae induced empyema. These models feature different levels of inflammation and PAI‐1 expression. PAI‐1‐TFT with DSP (2.0 mg/kg) converted ineffective doses of single chain (sc) tPA (72.5 µg/kg) and scuPA (62.5 µg/kg) into effective ones in chemically induced pleural injury. DSP (2.0 mg/kg) was ineffective in S. pneumoniae empyema, where the level of PAI‐1 is an order of magnitude higher. DSP dose escalation to 8.0 mg/kg resulted in effective PAI‐1‐TFT with 0.25 mg/kg sctPA (1/8th of the effective dose of sctPA alone) in empyema. There was no increase in the efficacy of scuPA. PAI‐1‐TFT with DSP increases the efficacy of fibrinolytic therapy up to 8‐fold in chemically induced (sctPA and scuPA) and infectious (sctPA) pleural injury in rabbits. PAI‐1 is a valid molecular target in our model of S. pneumoniae empyema in rabbits, which closely recapitulates key characteristics of empyema in humans. Low‐dose PAI‐1‐TFT is a novel interventional strategy that offers the potential to improve fibrinolytic therapy for empyema in clinical practice.
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Affiliation(s)
- Galina Florova
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - René A Girard
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | | | - Krishna Sarva
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | | | - Sophia Karandashova
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Christian J DeVera
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Danna Morris
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Mignote Chamiso
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Kathleen Koenig
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Douglas B Cines
- Department of Pathology and Laboratory Medicine, Perelman-University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Steven Idell
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
| | - Andrey A Komissarov
- The Department of Cellular and Molecular Biology of the University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX, USA
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