1
|
Yang Y, Gu B, Xu XY. In silico study of combination thrombolytic therapy with alteplase and mutant pro-urokinase for fibrinolysis in ischemic stroke. Comput Biol Med 2024; 171:108141. [PMID: 38367449 DOI: 10.1016/j.compbiomed.2024.108141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/03/2024] [Accepted: 02/12/2024] [Indexed: 02/19/2024]
Abstract
The synergistic advantage of combining tissue plasminogen activator (tPA) with pro-urokinase (proUK) for thrombolysis has been demonstrated in several in vitro experiments, and a single site proUK mutant (m-proUK) has been developed for better stability in plasma. Based on these studies, combination thrombolytic therapy with intravenous tPA and m-proUK has been suggested as a promising treatment for patients with ischemic stroke. This paper evaluates the efficacy and safety of the dual therapy by computational simulations of pharmacokinetics and pharmacodynamics coupled with a local fibrinolysis model. Seven dose regimens are simulated and compared with the standard intravenous tPA monotherapy. Our simulation results provide more insights into the complementary reaction mechanisms of tPA and m-proUK during clot lysis and demonstrate that the dual therapy can achieve a similar recanalization time (about 50 min) to tPA monotherapy, while keeping the circulating fibrinogen level within a normal range. Specifically, our results show that for all dual therapies with a 5 mg tPA bolus, the plasma concentration of fibrinogen remains stable at around 7.5 μM after a slow depletion over 50 min, whereas a rapid depletion of circulating fibrinogen (to 5 μM) is observed with the standard tPA therapy, indicating the potential advantage of dual therapy in reducing the risk of intracranial hemorrhage. Through simulations of varying dose combinations, it has been found that increasing tPA bolus can significantly affect fibrinogen level but only moderately improves recanalization time. Conversely, m-proUK doses and infusion duration exhibit a mild impact on fibrinogen level but significantly affect recanalization time. Therefore, future optimization of dose regimen should focus on limiting the tPA bolus while adjusting m-proUK dosage and infusion rate. Such adjustments could potentially maximize the therapeutic advantages of this combination therapy for ischemic stroke treatment.
Collapse
Affiliation(s)
- Yilin Yang
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom.
| | - Boram Gu
- School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, Republic of Korea.
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom.
| |
Collapse
|
2
|
Torres-Paris C, Chen Y, Xiao L, Song HJ, Chen P, Komives EA. The autoactivation of human single-chain urokinase-type plasminogen activator (uPA). J Biol Chem 2023; 299:105179. [PMID: 37607618 PMCID: PMC10520878 DOI: 10.1016/j.jbc.2023.105179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/29/2023] [Accepted: 08/15/2023] [Indexed: 08/24/2023] Open
Abstract
Most serine proteases are synthesized as inactive zymogens that are activated by cleavage by another protease in a tightly regulated mechanism. The urokinase-type plasminogen activator (uPA) and plasmin cleave and activate each other, constituting a positive feedback loop. How this mutual activation cycle begins has remained a mystery. We used hydrogen deuterium exchange mass spectrometry to characterize the dynamic differences between the inactive single-chain uPA (scuPA) and its active form two-chain uPA (tcuPA). The results show that the C-terminal β-barrel and the area around the new N terminus have significantly reduced dynamics in tcuPA as compared with scuPA. We also show that the zymogen scuPA is inactive but can, upon storage, become active in the absence of external proteases. In addition to plasmin, the tcuPA can activate scuPA by cleavage at K158, a process called autoactivation. Unexpectedly, tcuPA can cleave at position 158 even when this site is mutated. TcuPA can also cleave scuPA after K135 or K136 in the disordered linker, which generates the soluble protease domain of uPA. Plasmin cleaves scuPA exclusively after K158 and at a faster rate than tcuPA. We propose a mechanism by which the uPA receptor dimerization could promote autoactivation of scuPA on cell surfaces. These results resolve long-standing controversies in the literature surrounding the mechanism of uPA activation.
Collapse
Affiliation(s)
- Constanza Torres-Paris
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
| | - Yueyi Chen
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
| | - Lufan Xiao
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
| | - Harriet J Song
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
| | - Pingyu Chen
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
| | - Elizabeth A Komives
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA.
| |
Collapse
|
3
|
van der Ende NAM, Roozenbeek B, Smagge LEM, Luijten SPR, Aerden LAM, Kraayeveld P, van den Wijngaard IR, Lycklama à Nijeholt GJ, den Hertog HM, Flach HZ, Postma AA, Roosendaal SD, Krietemeijer GM, Yo LSF, de Maat MPM, Nieboer D, Del Zoppo GJ, Meurer WJ, Lingsma HF, van der Lugt A, Dippel DWJ. Safety and Efficacy of Dual Thrombolytic Therapy With Mutant Prourokinase and Small Bolus Alteplase for Ischemic Stroke: A Randomized Clinical Trial. JAMA Neurol 2023; 80:714-722. [PMID: 37213122 PMCID: PMC10203964 DOI: 10.1001/jamaneurol.2023.1262] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 03/17/2023] [Indexed: 05/23/2023]
Abstract
Importance Dual thrombolytic treatment with small bolus alteplase and mutant prourokinase has the potential to be a safer and more efficacious treatment for ischemic stroke than alteplase alone because mutant prourokinase is designed to act only on degraded fibrin without affecting circulating fibrinogen. Objective To assess the safety and efficacy of this dual thrombolytic treatment compared with alteplase. Design, Setting, and Participants This controlled, open-label randomized clinical trial with a blinded end point was conducted from August 10, 2019, to March 26, 2022, with a total follow-up of 30 days. Adult patients with ischemic stroke from 4 stroke centers in the Netherlands were enrolled. Interventions Patients were randomized (1:1) to receive a bolus of 5 mg of intravenous alteplase and 40 mg of an intravenous infusion of mutant prourokinase (intervention) or usual care with 0.9 mg/kg of intravenous alteplase (control). Main Outcomes and Measures The primary outcome was any intracranial hemorrhage (ICH) on neuroimaging at 24 hours. Secondary outcomes included functional outcome at 30 days, symptomatic ICH, and fibrinogen levels within 24 hours. Analyses were by intention to treat. Treatment effects were adjusted for baseline prognostic factors. Results A total of 268 patients were randomized, and 238 (median [IQR] age, 69 [59-77] years; 147 [61.8%] male) provided deferred consent and were included in the intention-to-treat population (121 in the intervention group and 117 in the control group). The median baseline score on the National Institutes of Health Stroke Scale was 3 (IQR, 2-5). Any ICH occurred in 16 of 121 patients (13.2%) in the intervention group and 16 of 117 patients (13.7%) in the control group (adjusted odds ratio, 0.98; 95% CI, 0.46-2.12). Mutant prourokinase led to a nonsignificant shift toward better modified Rankin Scale scores (adjusted common odds ratio, 1.16; 95% CI, 0.74-1.84). Symptomatic ICH occurred in none of the patients in the intervention group and 3 of 117 patients (2.6%) in the control group. Plasma fibrinogen levels at 1 hour remained constant in the intervention group but decreased in the control group (β = 65 mg/dL; 95% CI, 26-105 mg/dL). Conclusions and Relevance In this trial, dual thrombolytic treatment with small bolus alteplase and mutant prourokinase was found to be safe and did not result in fibrinogen depletion. Further evaluation of thrombolytic treatment with mutant prourokinase in larger trials to improve outcomes in patients with larger ischemic strokes is needed. Overall, in patients with minor ischemic stroke who met indications for treatment with intravenous thrombolytics but were not eligible for treatment with endovascular therapy, dual thrombolytic therapy with intravenous mutant prourokinase was not superior to treatment with intravenous alteplase alone. Trial Registration ClinicalTrials.gov Identifier: NCT04256473.
Collapse
Affiliation(s)
- Nadinda A. M. van der Ende
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Bob Roozenbeek
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Lucas E. M. Smagge
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Sven P. R. Luijten
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Leo A. M. Aerden
- Department of Neurology, Reinier de Graaf, Delft, the Netherlands
| | - Petra Kraayeveld
- Department of Radiology and Nuclear Medicine, Reinier de Graaf, Delft, the Netherlands
| | | | | | | | - H. Zwenneke Flach
- Department of Radiology and Nuclear Medicine, Isala, Zwolle, the Netherlands
| | - Alida A. Postma
- Department of Radiology and Nuclear Medicine, School for Mental Health and Sciences, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Stefan D. Roosendaal
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - G. Menno Krietemeijer
- Department of Radiology and Nuclear Medicine, Catharina Hospital, Eindhoven, the Netherlands
| | - Lonneke S. F. Yo
- Department of Radiology and Nuclear Medicine, Catharina Hospital, Eindhoven, the Netherlands
| | - Moniek P. M. de Maat
- Department of Hematology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Daan Nieboer
- Department of Public Health, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Gregory J. Del Zoppo
- Division of Hematology, Department of Medicine, University of Washington School of Medicine, Seattle
- Department of Neurology, University of Washington School of Medicine, Seattle
| | - William J. Meurer
- Departments of Neurology, University of Michigan Medical School, Ann Arbor
- Departments of Emergency Medicine, University of Michigan Medical School, Ann Arbor
- Berry Consultants, Austin, Texas
| | - Hester F. Lingsma
- Department of Public Health, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Aad van der Lugt
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Diederik W. J. Dippel
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| |
Collapse
|
4
|
Toul M, Slonkova V, Mican J, Urminsky A, Tomkova M, Sedlak E, Bednar D, Damborsky J, Hernychova L, Prokop Z. Identification, characterization, and engineering of glycosylation in thrombolyticsa. Biotechnol Adv 2023; 66:108174. [PMID: 37182613 DOI: 10.1016/j.biotechadv.2023.108174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/09/2023] [Accepted: 05/09/2023] [Indexed: 05/16/2023]
Abstract
Cardiovascular diseases, such as myocardial infarction, ischemic stroke, and pulmonary embolism, are the most common causes of disability and death worldwide. Blood clot hydrolysis by thrombolytic enzymes and thrombectomy are key clinical interventions. The most widely used thrombolytic enzyme is alteplase, which has been used in clinical practice since 1986. Another clinically used thrombolytic protein is tenecteplase, which has modified epitopes and engineered glycosylation sites, suggesting that carbohydrate modification in thrombolytic enzymes is a viable strategy for their improvement. This comprehensive review summarizes current knowledge on computational and experimental identification of glycosylation sites and glycan identity, together with methods used for their reengineering. Practical examples from previous studies focus on modification of glycosylations in thrombolytics, e.g., alteplase, tenecteplase, reteplase, urokinase, saruplase, and desmoteplase. Collected clinical data on these glycoproteins demonstrate the great potential of this engineering strategy. Outstanding combinatorics originating from multiple glycosylation sites and the vast variety of covalently attached glycan species can be addressed by directed evolution or rational design. Directed evolution pipelines would benefit from more efficient cell-free expression and high-throughput screening assays, while rational design must employ structure prediction by machine learning and in silico characterization by supercomputing. Perspectives on challenges and opportunities for improvement of thrombolytic enzymes by engineering and evolution of protein glycosylation are provided.
Collapse
Affiliation(s)
- Martin Toul
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Veronika Slonkova
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Jan Mican
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Adam Urminsky
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53 Brno, Czech Republic
| | - Maria Tomkova
- Center for Interdisciplinary Biosciences, P. J. Safarik University in Kosice, Jesenna 5, 04154 Kosice, Slovakia
| | - Erik Sedlak
- Center for Interdisciplinary Biosciences, P. J. Safarik University in Kosice, Jesenna 5, 04154 Kosice, Slovakia
| | - David Bednar
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Jiri Damborsky
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Lenka Hernychova
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53 Brno, Czech Republic.
| | - Zbynek Prokop
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic.
| |
Collapse
|
5
|
van der Ende NAM, Roozenbeek B, Smagge LEM, Luijten SPR, Aerden LAM, Kraayeveld P, van den Wijngaard IR, Lycklama À Nijeholt GJ, den Hertog HM, Flach HZ, Wallace AC, Gurewich V, Del Zoppo GJ, Meurer WJ, Lingsma HF, van der Lugt A, Dippel DWJ. Dual thrombolytic therapy with mutant pro-urokinase and small bolus alteplase for ischemic stroke (DUMAS): study protocol for a multicenter randomized controlled phase II trial. Trials 2022; 23:641. [PMID: 35945566 PMCID: PMC9361639 DOI: 10.1186/s13063-022-06596-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 07/25/2022] [Indexed: 11/10/2022] Open
Abstract
Background The effectiveness of alteplase for ischemic stroke treatment is limited, partly due to the occurrence of intracranial and extracranial hemorrhage. Mutant pro-urokinase (m-proUK) does not deplete fibrinogen and lyses fibrin only after induction with alteplase. Therefore, this treatment has the potential to be safer and more efficacious than treatment with alteplase alone. The aim of this study is to assess the safety and efficacy of thrombolytic treatment consisting of a small bolus alteplase followed by m-proUK compared with standard thrombolytic treatment with alteplase in patients presenting with ischemic stroke. Methods DUMAS is a multicenter, phase II trial with a prospective randomized open-label blinded end-point (PROBE) design, and an adaptive design for dose optimization. Patients with ischemic stroke, who meet the criteria for treatment with intravenous (IV) alteplase can be included. Patients eligible for endovascular thrombectomy are excluded. Patients are randomly assigned (1:1) to receive a bolus of IV alteplase (5mg) followed by a continuous IV infusion of m-proUK (40 mg/h during 60 min) or usual care with alteplase (0.9 mg/kg). Depending on the results of interim analyses, the dose of m-proUK may be revised to a lower dose (30 mg/h during 60 min) or a higher dose (50 mg/h during 60 min). We aim to include 200 patients with a final diagnosis of ischemic stroke. The primary outcome is any post-intervention intracranial hemorrhage (ICH) on neuroimaging at 24 h according to the Heidelberg Bleeding Classification, analyzed with binary logistic regression. Efficacy outcomes include stroke severity measured with the National Institutes of Health Stroke Scale (NIHSS) at 24 h and 5–7 days, score on the modified Rankin scale (mRS) assessed at 30 days, change (pre-treatment vs. post-treatment) in abnormal perfusion volume, and blood biomarkers of thrombolysis at 24 h. Secondary safety endpoints include symptomatic intracranial hemorrhage, death, and major extracranial hemorrhage. This trial will use a deferred consent procedure. Discussion When dual thrombolytic therapy with a small bolus alteplase and m-proUK shows the anticipated effect on the outcome, this will lead to a 13% absolute reduction in the occurrence of ICH in patients with ischemic stroke. Trial registration NL7409 (November 26, 2018)/NCT04256473 (February 5, 2020) Supplementary Information The online version contains supplementary material available at 10.1186/s13063-022-06596-z.
Collapse
Affiliation(s)
- Nadinda A M van der Ende
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands. .,Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands.
| | - Bob Roozenbeek
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Lucas E M Smagge
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Sven P R Luijten
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Leo A M Aerden
- Department of Neurology, Reinier de Graaf, Delft, the Netherlands
| | - Petra Kraayeveld
- Department of Radiology and Nuclear Medicine, Reinier de Graaf, Delft, the Netherlands
| | | | | | | | - H Zwenneke Flach
- Department of Radiology and Nuclear Medicine, Isala klinieken, Zwolle, the Netherlands
| | | | - Victor Gurewich
- Thrombolytic Science, Cambridge, MA, USA.,Department of Medicine, Mount Auburn Hospital, Harvard Medical School, Boston, MA, USA
| | - Gregory J Del Zoppo
- Department of Medicine, Division of Hematology, University of Washington School of Medicine, Seattle, WA, USA.,Department of Neurology, Division of Hematology, University of Washington School of Medicine, Seattle, WA, USA
| | - William J Meurer
- Departments of Neurology, University of Michigan Medical School, Ann Arbor, MI, USA.,Departments of Emergency Medicine, University of Michigan Medical School, Ann Arbor, MI, USA.,Berry Consultants, Austin, TX, USA
| | - Hester F Lingsma
- Department of Public Health, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Aad van der Lugt
- Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Diederik W J Dippel
- Department of Neurology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | | |
Collapse
|
6
|
Mechanisms of Thrombosis and Thrombolysis. Stroke 2022. [DOI: 10.1016/b978-0-323-69424-7.00002-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
7
|
Mercurio D, Piotti A, Valente A, Oggioni M, Ponstein Y, Van Amersfoort E, Gobbi M, Fumagalli S, De Simoni MG. Plasma-derived and recombinant C1 esterase inhibitor: Binding profiles and neuroprotective properties in brain ischemia/reperfusion injury. Brain Behav Immun 2021; 93:299-311. [PMID: 33444732 DOI: 10.1016/j.bbi.2021.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 12/23/2020] [Accepted: 01/06/2021] [Indexed: 10/22/2022] Open
Abstract
C1 esterase inhibitor (C1INH) is known to exert its inhibitory effect by binding to several target proteases of the contact and complement systems. One of C1INH's targets comprise mannose-binding lectin (MBL), a critical player in post-stroke pathophysiology. We therefore explored the effects of recombinant human (rh) and plasma derived (pd) C1INH in C57BL/6J mice subjected to transient occlusion of the middle cerebral artery (tMCAo), receiving 15U/mouse of pd or rhC1INH intravenously, at reperfusion. We analyzed the compounds' (i)neuroprotective effects, (ii) plasma presence, (iii)effects on circulating and brain MBL, (iv)time course of endothelial deposition, and (v) effects on the formation of active complement products. rhC1INH-treated mice had neuroprotective effects, including reduced behavioral deficits and neuronal loss, associated with decreased MBL brain deposition and decreased formation of complement C4b active fragments. In contrast, pdC1INH did not show these neuroprotective effects despite its longer plasma residence time. We also analyzed the response to tMCAo in C1INH-deficient mice, observing a poorer ischemic outcome compared to the wild type mice, which could be partially prevented by rhC1INH administration. In conclusion, we show that rhC1INH exhibits stronger neuroprotective effects than the corresponding plasma-derived protein after experimental ischemia/reperfusion injury in the brain, placing it as a promising drug for stroke. Differential effects are likely related to more effective MBL inhibition which further confirms it as a useful pharmacological target for stroke.
Collapse
Affiliation(s)
- Domenico Mercurio
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Neuroscience, Milan, Italy
| | - Arianna Piotti
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Biochemistry and Molecular Pharmacology, Milan, Italy
| | - Alessia Valente
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Neuroscience, Milan, Italy
| | - Marco Oggioni
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Neuroscience, Milan, Italy
| | | | | | - Marco Gobbi
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Biochemistry and Molecular Pharmacology, Milan, Italy
| | - Stefano Fumagalli
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Neuroscience, Milan, Italy.
| | - Maria-Grazia De Simoni
- Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Department of Neuroscience, Milan, Italy
| |
Collapse
|
8
|
Fibrinolysis: a Misunderstood Natural Defense Whose Therapeutic Potential Is Unknown. Cardiovasc Drugs Ther 2020; 33:749-753. [PMID: 31897763 DOI: 10.1007/s10557-019-06923-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Ever since tissue plasminogen activator (tPA) was approved for therapeutic fibrinolysis in 1987, it has been the fibrinolytic of choice. At the same time, it is also recognized that tPA never lived up to its clinical expectations and has more recently been replaced by percutaneous coronary intervention (PCI) as the treatment of choice for acute myocardial infarction (AMI). For other occlusive vascular diseases and for patients in remote areas, tPA remains an essential option. In view of the continued importance of fibrinolysis, it is disappointing that fibrinolysis never evolved beyond what it was when tPA replaced streptokinase (SK) 32 years ago. The endovascular procedure replacement for AMI treatment suffers from being technically demanding, time-consuming, and costly. An untested alternative fibrinolytic paradigm is that of the endogenous, physiological system, which is initiated by tPA but then is followed by the other natural plasminogen activator, urokinase plasminogen activator (uPA). In this combination, it is uPA rather than tPA that has the dominant function. This is also evident from gene knockout studies where deletion of uPA that it has the dominant effect. The fibrinolytic properties of tPA and uPA are complementary so that their combined effect is synergistic, especially when they are administered sequentially starting with tPA. Endogenous fibrinolysis functions without bleeding side effects and is ongoing. This is evidenced by the invariable presence in blood of the fibrin degradation product, D-dimer (normal concentration 110-250 ng/ml). This activator combination, consisting of a mini bolus of tPA followed by a 90-min proUK infusion, was once used to treat 101 AMI patients. Compared with the best of the tPA mega trials, this regimen resulted in an almost a doubling of the infarct artery patency rate and reduced mortality sixfold. To date, a second trial has not yet been done.
Collapse
|
9
|
Huang Y, Yu L, Ren J, Gu B, Longstaff C, Hughes AD, Thom SA, Xu XY, Chen R. An activated-platelet-sensitive nanocarrier enables targeted delivery of tissue plasminogen activator for effective thrombolytic therapy. J Control Release 2019; 300:1-12. [PMID: 30807804 DOI: 10.1016/j.jconrel.2019.02.033] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 02/17/2019] [Accepted: 02/21/2019] [Indexed: 11/28/2022]
Abstract
It remains a major challenge to develop a selective and effective fibrinolytic system for thrombolysis with minimal undesirable side effects. Herein, we report a multifunctional liposomal system (164.6 ± 5.3 nm in diameter) which can address this challenge through targeted delivery and controlled release of tissue plasminogen activator (tPA) at the thrombus site. The tPA-loaded liposomes were PEGylated to improve their stability, and surface coated with a conformationally-constrained, cyclic arginine-glycine-aspartic acid (cRGD) to enable highly selective binding to activated platelets. The in vitro drug release profiles at 37 °C showed that over 90% of tPA was released through liposomal membrane destabilization involving membrane fusion upon incubation with activated platelets within 1 h, whereas passive release of the encapsulated tPA in pH 7.4 PBS buffer was 10% after 6 h. The release of tPA could be readily manipulated by changing the concentration of activated platelets. The presence of activated platelets enabled the tPA-loaded, cRGD-coated, PEGylated liposomes to induce efficient fibrin clot lysis in a fibrin-agar plate model and the encapsulated tPA retained 97.4 ± 1.7% of fibrinolytic activity as compared with that of native tPA. Furthermore, almost complete blood clot lysis was achieved in 75 min, showing considerably higher and quicker thrombolytic activity compared to the tPA-loaded liposomes without cRGD labelling. These results suggest that the nano-sized, activated-platelet-sensitive, multifunctional liposomes could facilitate selective delivery and effective release of tPA at the site of thrombus, thus achieving efficient clot dissolution whilst minimising undesirable side effects.
Collapse
Affiliation(s)
- Yu Huang
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
| | - Li Yu
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
| | - Jie Ren
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
| | - Boram Gu
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
| | - Colin Longstaff
- Biotherapeutics Section, National Institute for Biological Standards and Control, South Mimms, Herts, United Kingdom
| | - Alun D Hughes
- Institute of Cardiovascular Science, University College London, London, United Kingdom; MRC Unit for Lifelong Health and Ageing at University College London, London, United Kingdom
| | - Simon A Thom
- National Heart & Lung Institute, Imperial College London, Hammersmith Campus, London, United Kingdom
| | - Xiao Yun Xu
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
| | - Rongjun Chen
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom.
| |
Collapse
|
10
|
Pannell R, Li S, Gurewich V. Fibrin-specific and effective clot lysis requires both plasminogen activators and for them to be in a sequential rather than simultaneous combination. J Thromb Thrombolysis 2018; 44:210-215. [PMID: 28600623 DOI: 10.1007/s11239-017-1514-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Thrombolysis with tissue plasminogen activator (tPA) has been a disappointment and has now been replaced by an endovascular procedure whenever possible. Nevertheless, thrombolysis remains the only means by which circulation in a thrombosed artery can be restored rapidly. In contrast to tPA monotherapy, endogenous fibrinolysis uses both tPA and urokinase plasminogen activator (uPA), whose native form is a proenzyme, prouPA. This combination is remarkably effective as evidenced by the fibrin degradation product, D-dimer, which is invariably present in plasma. The two activators have complementary mechanisms of plasminogen activation and are synergistic in combination. Since tPA initiates fibrinolysis when released from the vessel wall and prouPA is in the blood, they induce fibrinolysis sequentially. It was postulated that this may be more effective and fibrin-specific. The hypothesis was tested in a model of clot lysis in plasma in which a clot was first exposed to tPA for 5 min, washed and incubated with prouPA. Lysis was compared with that of clots incubated with both activators simultaneously. The sequential combination was almost twice as effective and caused less fibrinogenolysis than the simultaneous combination (p < 0.0001) despite having significantly less tPA, as a result of the wash. A mechanism is described by which this phenomenon can be explained. The findings are believed to have significant therapeutic implications.
Collapse
Affiliation(s)
- R Pannell
- Vascular Research Laboratory, Mount Auburn Hospital, Harvard Medical School, Cambridge, MA, USA
| | - S Li
- Vascular Research Laboratory, Mount Auburn Hospital, Harvard Medical School, Cambridge, MA, USA
| | - V Gurewich
- Vascular Research Laboratory, Mount Auburn Hospital, Harvard Medical School, Cambridge, MA, USA.
| |
Collapse
|
11
|
Abstract
Anticoagulation has been shown to improve mortality in acute pulmonary embolism (PE). Initiation of anticoagulation should be considered when PE is strongly suspected and the bleeding risk is perceived to be low, even if acute PE has not yet been proven. Low-risk patients with acute PE are simply continued on anticoagulation. Severely ill patients with high-risk (massive) PE require aggressive therapy, and if the bleeding risk is acceptable, systemic thrombolysis should be considered. However, despite clear evidence that parenteral thrombolytic therapy leads to more rapid clot resolution than anticoagulation alone, the risk of major bleeding including intracranial bleeding is significantly higher when systemic thrombolytic therapy is administered. It has been demonstrated that right ventricular dysfunction, as well as abnormal biomarkers (troponin and brain natriuretic peptide) are associated with increased mortality in acute PE. In spite of this, intermediate-risk (submassive) PE comprises a fairly broad clinical spectrum. For several decades, clinicians and clinical trialists have worked toward a more aggressive, yet safe solution for patients with intermediate-risk PE. Standard-dose thrombolysis, low-dose systemic thrombolysis, and catheter-based therapy which includes a number of devices and techniques, with or without low-dose thrombolytic therapy, have offered potential solutions and this area has continued to evolve. On the basis of heterogeneity within the category of intermediate-risk as well as within the high-risk group of patients, we will focus on the use of systemic thrombolysis in carefully selected high- and intermediate-risk patients. In certain circumstances when the need for aggressive therapy is urgent and the bleeding risk is acceptable, this is an appropriate approach, and often the best one.
Collapse
Affiliation(s)
- Victor F Tapson
- Division of Pulmonary and Critical Care, Venous Thromboembolism and Pulmonary Vascular Disease Research, Pulmonary and Critical Care Medicine, Cedars-Sinai Medical Center, Los Angeles, CA.
| | - Oren Friedman
- Division of Pulmonary and Critical Care, Pulmonary and Critical Care Medicine, Cardiac Surgery Intensive Care Unit, Cedars-Sinai Medical Center, Los Angeles, CA
| |
Collapse
|
12
|
Gurewich V. Why so little progress in therapeutic thrombolysis? The current state of the art and prospects for improvement. J Thromb Thrombolysis 2016; 40:480-7. [PMID: 25894475 PMCID: PMC4584119 DOI: 10.1007/s11239-015-1217-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Victor Gurewich
- Vascular Research Laboratory, Mt Auburn Hospital, Harvard Medical School, Cambridge, MA, USA.
| |
Collapse
|
13
|
Gurewich V. Thrombolysis: A Critical First-Line Therapy with an Unfulfilled Potential. Am J Med 2016; 129:573-5. [PMID: 26714208 DOI: 10.1016/j.amjmed.2015.11.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 11/19/2015] [Accepted: 11/19/2015] [Indexed: 11/17/2022]
Abstract
A blood clot or thrombus triggers the onset of most vascular diseases, like stroke or heart attack. Thrombolysis is the only treatment that can restore blood flow rapidly and easily. Unfortunately, the standard thrombolytic, tissue plasminogen activator (tPA), has proven inadequate and is being replaced by invasive endovascular procedures, which are time consuming and limited in their availability in relation to the scope of the problem. Historically, when tPA clinical trials began, it was not recognized sufficiently that without the other natural plasminogen activator, prourokinase (proUK), thrombolysis by tPA was seriously compromised. The reason is that the 2 activators have complementary mechanisms of action in fibrinolysis, making their combination a requirement for optimal efficacy and synergy. Biological fibrinolysis also uses both activators, explaining why such low endogenous concentrations are sufficient. A low-dose sequential combination of tPA and proUK was tested in acute myocardial infarction, where it was exceptionally effective and safe. Because native proUK at pharmacological doses was vulnerable to spontaneous conversion to urokinase, jeopardizing safety, a site-directed mutant was developed that improved proUK's plasma stability fivefold without interfering with its mode of action. Mini-bolus tPA followed by low-dose proUK infusion is a simple, safe, effective, and promising first-line treatment of acute thrombotic disorders.
Collapse
Affiliation(s)
- Victor Gurewich
- Vascular Research Laboratory, Mt Auburn Hospital, Cambridge, Mass; Department of Medicine, Harvard Medical School, Cambridge, Mass.
| |
Collapse
|