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Florova G, De Vera CJ, Emerine RL, Girard RA, Azghani AO, Sarva K, Jacob J, Morris DE, Chamiso M, Idell S, Komissarov AA. Targeting the PAI-1 Mechanism with a Small Peptide Increases the Efficacy of Alteplase in a Rabbit Model of Chronic Empyema. Pharmaceutics 2023; 15:1498. [PMID: 37242740 PMCID: PMC10220965 DOI: 10.3390/pharmaceutics15051498] [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: 04/01/2023] [Revised: 05/07/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
The incidence of empyema is increasing and associated with a mortality rate of 20% in patients older than 65 years. Since 30% of patients with advanced empyema have contraindications to surgical treatment, novel, low-dose, pharmacological treatments are needed. A Streptococcus pneumoniae-induced rabbit model of chronic empyema recapitulates the progression, loculation, fibrotic repair, and pleural thickening of human disease. Treatment with single chain (sc) urokinase (scuPA) or tissue type (sctPA) plasminogen activators in doses 1.0-4.0 mg/kg were only partially effective in this model. Docking Site Peptide (DSP; 8.0 mg/kg), which decreased the dose of sctPA for successful fibrinolytic therapy in acute empyema model did not improve efficacy in combination with 2.0 mg/kg scuPA or sctPA. However, a two-fold increase in either sctPA or DSP (4.0 and 8.0 mg/kg or 2.0 and 16.0 mg/kg sctPA and DSP, respectively) resulted in 100% effective outcome. Thus, DSP-based Plasminogen Activator Inhibitor 1-Targeted Fibrinolytic Therapy (PAI-1-TFT) of chronic infectious pleural injury in rabbits increases the efficacy of alteplase rendering ineffective doses of sctPA effective. PAI-1-TFT represents a novel, well-tolerated treatment of empyema that is amenable to clinical introduction. The chronic empyema model recapitulates increased resistance of advanced human empyema to fibrinolytic therapy, thus allowing for studies of muti-injection treatments.
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Affiliation(s)
- Galina Florova
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Christian J. De Vera
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Rebekah L. Emerine
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - René A. Girard
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Ali O. Azghani
- The Department of Biology, University of Texas at Tyler, Tyler, TX 75799, USA;
| | - Krishna Sarva
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Jincy Jacob
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Danna E. Morris
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Mignote Chamiso
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Steven Idell
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
| | - Andrey A. Komissarov
- The Department of Cellular and Molecular Biology, University of Texas Health Science Center at Tyler (UTHSCT), Tyler, TX 75708, USA; (G.F.); (C.J.D.V.); (R.L.E.); (R.A.G.); (K.S.); (J.J.); (D.E.M.); (M.C.); (S.I.)
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Bohannon KP, Bittner MA, Lawrence DA, Axelrod D, Holz RW. Slow fusion pore expansion creates a unique reaction chamber for co-packaged cargo. J Gen Physiol 2017; 149:921-934. [PMID: 28882880 PMCID: PMC5694939 DOI: 10.1085/jgp.201711842] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/21/2017] [Indexed: 12/29/2022] Open
Abstract
A lumenal secretory granule protein can slow fusion pore dilation and thus its own discharge. Bohannon et al. demonstrate another outcome: the creation of a nanoscale chemical reaction chamber for granule contents in which the pH is suddenly neutralized upon fusion. A lumenal secretory granule protein, tissue plasminogen activator (tPA), greatly slows fusion pore dilation and thereby slows its own discharge. We investigated another outcome of the long-lived narrow fusion pore: the creation of a nanoscale chemical reaction chamber for granule contents in which the pH is suddenly neutralized upon fusion. Bovine adrenal chromaffin cells endogenously express both tPA and its primary protein inhibitor, plasminogen activator inhibitor 1 (PAI). We found by immunocytochemistry that tPA and PAI are co-packaged in the same secretory granule. It is known that PAI irreversibly and covalently inactivates tPA at neutral pH. We demonstrate with zymography that the acidic granule lumen protects tPA from inactivation by PAI. Immunocytochemistry, total internal reflection fluorescence (TIRF) microscopy, and polarized TIRF microscopy demonstrated that co-packaged PAI and tPA remain together in granules for many seconds in the nanoscale reaction chamber, more than enough time to inhibit tPA and create a new secreted protein species.
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Affiliation(s)
- Kevin P Bohannon
- Department of Pharmacology, University of Michigan, Ann Arbor, MI
| | - Mary A Bittner
- Department of Pharmacology, University of Michigan, Ann Arbor, MI
| | - Daniel A Lawrence
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI.,Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI
| | - Daniel Axelrod
- Department of Pharmacology, University of Michigan, Ann Arbor, MI.,Department of Physics, University of Michigan, Ann Arbor, MI.,LSA Biophysics, University of Michigan, Ann Arbor, MI
| | - Ronald W Holz
- Department of Pharmacology, University of Michigan, Ann Arbor, MI
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Mechanistic characterization and crystal structure of a small molecule inactivator bound to plasminogen activator inhibitor-1. Proc Natl Acad Sci U S A 2013; 110:E4941-9. [PMID: 24297881 DOI: 10.1073/pnas.1216499110] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Plasminogen activator inhibitor type-1 (PAI-1) is a member of the serine protease inhibitor (serpin) family. Excessive PAI-1 activity is associated with human disease, making it an attractive pharmaceutical target. However, like other serpins, PAI-1 has a labile structure, making it a difficult target for the development of small molecule inhibitors, and to date, there are no US Food and Drug Administration-approved small molecule inactivators of any serpins. Here we describe the mechanistic and structural characterization of a high affinity inactivator of PAI-1. This molecule binds to PAI-1 reversibly and acts through an allosteric mechanism that inhibits PAI-1 binding to proteases and to its cofactor vitronectin. The binding site is identified by X-ray crystallography and mutagenesis as a pocket at the interface of β-sheets B and C and α-helix H. A similar pocket is present on other serpins, suggesting that this site could be a common target in this structurally conserved protein family.
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Florova G, Karandashova S, Declerck PJ, Idell S, Komissarov AA. Remarkable stabilization of plasminogen activator inhibitor 1 in a "molecular sandwich" complex. Biochemistry 2013; 52:4697-709. [PMID: 23734661 DOI: 10.1021/bi400470s] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Plasminogen activator inhibitor 1 (PAI-1) levels are elevated in a number of life-threatening conditions and often correlate with unfavorable outcomes. Spontaneous inactivation due to active to latent transition limits PAI-1 activity in vivo. While endogenous vitronectin (Vn) stabilizes PAI-1 by 1.5-2.0-fold, further stabilization occurs in a "molecular sandwich" complex (MSC) in which a ligand that restricts the exposed reactive center loop is bound to PAI-1/Vn. The effects of S195A two-chain urokinase (tcuPA) and Vn on inactivation of wild-type (wt) glycosylated (Gl-PAI-1), nonglycosylated (rPAI-1), and nonglycosylated Q123K PAI-1 (lacks Vn binding) forms were studied. S195A tcuPA decreased the rate constant (kL) for spontaneous inactivation at 37 °C for rPAI-1, Q123K, and Gl-PAI-1 by 6.7-, 3.4-, and 7.8-fold, respectively, and both S195A tcuPA and Vn by 66.7-, 5.5-, and 103.3-fold, respectively. Analysis of the temperature dependences of kL revealed a synergistic increase in the Gibbs free activation energy for spontaneous inactivation of wt Gl-PAI-1 and rPAI-1 in MSC from 99.8 and 96.1 to 111.3 and 107.0 kJ/mol, respectively, due to an increase in the activation enthalpy and a decrease in the activation entropy. Anti-PAI-1 monoclonal antibodies (mAbs) competing with proteinase also stabilize PAI-1/Vn. The rate of inhibition of target proteinases by MSCs, with a stoichiometry close to unity, was limited by the dissociation (k = 10(-4) to 10(-3) s(-1)) of S195A tcuPA or mAb. The stabilization of PAI-1 in MSCs in vivo may potentiate uncontrolled thrombosis or extravascular fibrin deposition, suggesting a new paradigm for using PAI-1 inhibitors and novel potential targets for therapy.
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Affiliation(s)
- Galina Florova
- Texas Lung Injury Institute, University of Texas Health Science Center at Tyler , 11937 U.S. Highway 271, Tyler, Texas 75708-3154, United States
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Redirection of the reaction between activated protein C and a serpin to the substrate pathway. Thromb Res 2008; 122:397-404. [DOI: 10.1016/j.thromres.2007.10.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Revised: 09/13/2007] [Accepted: 10/23/2007] [Indexed: 11/19/2022]
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Komissarov AA, Zhou A, Declerck PJ. Modulation of serpin reaction through stabilization of transient intermediate by ligands bound to alpha-helix F. J Biol Chem 2007; 282:26306-15. [PMID: 17613529 DOI: 10.1074/jbc.m702089200] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mechanism-based inhibition of proteinases by serpins involves enzyme acylation and fast insertion of the reactive center loop (RCL) into the central beta-sheet of the serpin, resulting in mechanical inactivation of the proteinase. We examined the effects of ligands specific to alpha-helix F (alphaHF) of plasminogen activator inhibitor-1 (PAI-1) on the stoichiometry of inhibition (SI) and limiting rate constant (k(lim)) of RCL insertion for reactions with beta-trypsin, tissue-type plasminogen activator (tPA), and urokinase. The somatomedin B domain of vitronectin (SMBD) did not affect SI for any proteinase or k(lim) for tPA but decreased the k(lim) for beta-trypsin. In contrast to SMBD, monoclonal antibodies MA-55F4C12 and MA-33H1F7, the epitopes of which are located at the opposite side of alphaHF, decreased k(lim) and increased SI for every enzyme. These effects were enhanced in the presence of SMBD. RCL insertion for beta-trypsin and tPA is limited by different subsequent steps of PAI-1 mechanism as follows: enzyme acylation and formation of a loop-displaced acyl complex (LDA), respectively. Stabilization of LDA through the disruption of the exosite interactions between PAI-1 and tPA induced an increase in the k(lim) but did not affect the SI. Thus it is unlikely that LDA contributes significantly to the outcome of the serpin reaction. These results demonstrate that the rate of RCL insertion is not necessarily correlated with SI and indicate that an intermediate, different from LDA, which forms during the late steps of PAI-1 mechanism, and could be stabilized by ligands specific to alphaHF, controls bifurcation between the inhibitory and the substrate pathways.
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Affiliation(s)
- Andrey A Komissarov
- Department of Chemistry, Portland State University, Portland, Oregon 97207-0751, USA.
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Komissarov AA, Andreasen PA, Bødker JS, Declerck PJ, Anagli JY, Shore JD. Additivity in effects of vitronectin and monoclonal antibodies against alpha-helix F of plasminogen activator inhibitor-1 on its reactions with target proteinases. J Biol Chem 2004; 280:1482-9. [PMID: 15516335 DOI: 10.1074/jbc.m408608200] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The serpin plasminogen activator inhibitor-1 (PAI-1) is a potential therapeutic target in cardiovascular and cancerous diseases. PAI-1 circulates in blood as a complex with vitronectin. A PAI-1 variant (N-((2-(iodoacetoxy)ethyl)-N-methyl)amino-7-nitrobenz-2-oxa-3-diazole (NBD) P9 PAI-1) with a fluorescent tag at the reactive center loop (RCL) was used to study the effects of vitronectin and monoclonal antibodies (mAbs) directed against alpha-helix F (Mab-2 and MA-55F4C12) on the reactions of PAI-1 with tissue-type and urokinase-type plasminogen activators. Both mAbs delay the RCL insertion and induce an increase in the stoichiometry of inhibition (SI) to 1.4-9.5. Binding of vitronectin to NBD P9 PAI-1 does not affect SI but results in a 2.0-6.5-fold decrease in the limiting rate constant (klim) of RCL insertion for urokinase-type plasminogen activator at pH 6.2-8.0 and for tissue-type plasminogen activator at pH 6.2. Binding of vitronectin to the complexes of NBD P9 PAI-1 with mAbs results in a decrease in klim and in a 1.5-22-fold increase in SI. Thus, vitronectin and mAbs demonstrated additivity in the effects on the reaction with target proteinases. The same step in the reaction mechanism remains limiting for the rate of RCL insertion in the absence and presence of Vn and mAbs. We hypothesize that vitronectin, bound to alpha-helix F on the side opposite to the epitopes of the mAbs, potentiates the mAb-induced delay in RCL insertion and the associated substrate behavior by selectively decreasing the rate constant for the inhibitory branch of PAI-1 reaction (ki). These results demonstrate that mAbs represent a valid approach for inactivation of vitronectin-bound PAI-1 in vivo.
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Affiliation(s)
- Andrey A Komissarov
- Division of Biochemical Research, Department of Pathology, Henry Ford Health System, Detroit, Michigan 48202, USA.
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