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Fu C, Tong W, Yu L, Miao Y, Wei Q, Yu Z, Chen B, Wei M. When will the immune-stimulating antibody conjugates (ISACs) be transferred from bench to bedside? Pharmacol Res 2024; 203:107160. [PMID: 38547937 DOI: 10.1016/j.phrs.2024.107160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 03/17/2024] [Accepted: 03/25/2024] [Indexed: 04/30/2024]
Abstract
Immunostimulatory antibody conjugates (ISACs) as a promising new generation of targeted therapeutic antibody-drug conjugates (ADCs), that not only activate innate immunity but also stimulate adaptive immunity, providing a dual therapeutic effect to eliminate tumor cells. However, several ISACs are still in the early stages of clinical development or have already failed. Therefore, it is crucial to design ISACs more effectively to overcome their limitations, including high toxicity, strong immunogenicity, long development time, and poor pharmacokinetics. This review aims to summarize the composition and function of ISACs, incorporating current design considerations and ongoing clinical trials. Additionally, the review delves into the current issues with ISACs and potential solutions, such as adjusting the drug-antibody ratio (DAR) to improve the bioavailability of ISACs. By leveraging the affinity and bioavailability-enhancing properties of bispecific antibodies, the utility between antibodies and immunostimulatory agents can be balanced. Commonly used immunostimulatory agents may induce systemic immune reactions, and BTK (Bruton's tyrosine kinase) inhibitors can regulate immunogenicity. Finally, the concept of grafting ADC's therapeutic principles is simple, but the combination of payload, linker, and targeted functional molecules is not a simple permutation and combination problem. The development of conjugate drugs faces more complex pharmacological and toxicological issues. Standing on the shoulders of ADC, the development and application scenarios of ISAC are endowed with broader space.
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Affiliation(s)
- Chen Fu
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China
| | - Weiwei Tong
- Department of Laboratory Medicine, Shengjing Hospital of China Medical University, Shenyang 110122, PR China
| | - Lifeng Yu
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China
| | - Yuxi Miao
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China
| | - Qian Wei
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China
| | - Zhaojin Yu
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China.
| | - Bo Chen
- Department of Breast Surgery, The First Hospital of China Medical University, No. 155, Nanjing North Street, Shenyang 110122, PR China.
| | - Minjie Wei
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang 110122, PR China; Liaoning Key Laboratory of Molecular Targeted Anti-tumor Drug Development and Evaluation, China Medical University, Shenyang 110122, PR China.
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Soler Y, Rodriguez M, Austin D, Gineste C, Gelber C, El-Hage N. SERPIN-Derived Small Peptide (SP16) as a Potential Therapeutic Agent against HIV-Induced Inflammatory Molecules and Viral Replication in Cells of the Central Nervous System. Cells 2023; 12:cells12040632. [PMID: 36831299 PMCID: PMC9954444 DOI: 10.3390/cells12040632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/26/2023] [Accepted: 01/29/2023] [Indexed: 02/18/2023] Open
Abstract
Despite the success of combined antiretroviral therapy (cART) increasing the survival rate in human immunodeficiency virus (HIV) patients, low levels of viremia persist in the brain of patients leading to glia (microglia and astrocytes)-induced neuroinflammation and consequently, the reactivation of HIV and neuronal injury. Here, we tested the therapeutic efficacy of a Low-Density Lipoprotein Receptor-Related Protein 1 (LRP-1) agonistic small peptide drug (SP16) in attenuating HIV replication and the secretion of inflammatory molecules in brain reservoirs. SP16 was developed by Serpin Pharma and is derived from the pentapeptide sequence of the serine protease inhibitor alpha-1-antitrypsin (A1AT). The SP16 peptide sequence was subsequently modified to improve the stability, bioavailability, efficacy, and binding to LRP-1; a scavenger regulatory receptor that internalizes ligands to induce anti-viral, anti-inflammatory, and pro-survival signals. Using glial cells infected with HIV, we showed that: (i) SP16 attenuated viral-induced secretion of pro-inflammatory molecules; and (ii) SP16 attenuated viral replication. Using an artificial 3D blood-brain barrier (BBB) system, we showed that: (i) SP16 was transported across the BBB; and (ii) restored the permeability of the BBB compromised by HIV. Mechanistically, we showed that SP16 interaction with LRP-1 and binding lead to: (i) down-regulation in the expression levels of nuclear factor-kappa beta (NF-κB); and (ii) up-regulation in the expression levels of Akt. Using an in vivo mouse model, we showed that SP16 was transported across the BBB after intranasal delivery, while animals infected with EcoHIV undergo a reduction in (i) viral replication and (ii) viral secreted inflammatory molecules, after exposure to SP16 and antiretrovirals. Overall, these studies confirm a therapeutic response of SP16 against HIV-associated inflammatory effects in the brain.
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Affiliation(s)
- Yemmy Soler
- Department of Immunology and Nanomedicine, Herbert Wertheim College of Medicine, Miami, FL 33199, USA
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Myosotys Rodriguez
- Department of Immunology and Nanomedicine, Herbert Wertheim College of Medicine, Miami, FL 33199, USA
| | - Dana Austin
- Serpin Pharma, 9501 Discovery Blvd Suite 120, Manassas, VA 20109, USA
| | - Cyrille Gineste
- Serpin Pharma, 9501 Discovery Blvd Suite 120, Manassas, VA 20109, USA
| | - Cohava Gelber
- Serpin Pharma, 9501 Discovery Blvd Suite 120, Manassas, VA 20109, USA
| | - Nazira El-Hage
- Department of Immunology and Nanomedicine, Herbert Wertheim College of Medicine, Miami, FL 33199, USA
- Correspondence: ; Tel.: +1-(305)-348-4346; Fax: +1-(305)-348-1109
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Bai X, Bai A, Tomasicchio M, Hagman JR, Buckle AM, Gupta A, Kadiyala V, Bevers S, Serban KA, Kim K, Feng Z, Spendier K, Hagen G, Fornis L, Griffith DE, Dzieciatkowska M, Sandhaus RA, Gerber AN, Chan ED. α1-Antitrypsin Binds to the Glucocorticoid Receptor with Anti-Inflammatory and Antimycobacterial Significance in Macrophages. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 209:1746-1759. [PMID: 36162872 PMCID: PMC10829398 DOI: 10.4049/jimmunol.2200227] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 08/23/2022] [Indexed: 01/13/2024]
Abstract
α1-Antitrypsin (AAT), a serine protease inhibitor, is the third most abundant protein in plasma. Although the best-known function of AAT is irreversible inhibition of elastase, AAT is an acute-phase reactant and is increasingly recognized to have a panoply of other functions, including as an anti-inflammatory mediator and a host-protective molecule against various pathogens. Although a canonical receptor for AAT has not been identified, AAT can be internalized into the cytoplasm and is known to affect gene regulation. Because AAT has anti-inflammatory properties, we examined whether AAT binds the cytoplasmic glucocorticoid receptor (GR) in human macrophages. We report the finding that AAT binds to GR using several approaches, including coimmunoprecipitation, mass spectrometry, and microscale thermophoresis. We also performed in silico molecular modeling and found that binding between AAT and GR has a plausible stereochemical basis. The significance of this interaction in macrophages is evinced by AAT inhibition of LPS-induced NF-κB activation and IL-8 production as well as AAT induction of angiopoietin-like 4 protein, which are, in part, dependent on GR. Furthermore, this AAT-GR interaction contributes to a host-protective role against mycobacteria in macrophages. In summary, this study identifies a new mechanism for the gene regulation, anti-inflammatory, and host-defense properties of AAT.
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Affiliation(s)
- Xiyuan Bai
- Department of Medicine, Rocky Mountain Regional Veterans Affairs Medical Center, Denver, CO;
- Department of Academic Affairs, National Jewish Health, Denver, CO
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, CO
| | - An Bai
- Department of Academic Affairs, National Jewish Health, Denver, CO
| | - Michele Tomasicchio
- Centre for Lung Infection and Immunity, Division of Pulmonology, Department of Medicine, UCT Lung Institute and the MRC Centre for the Study of Antimicrobial Resistance, University of Cape Town, Cape Town, South Africa
| | - James R Hagman
- Department of Immunology and Genomic Medicine, National Jewish Health, Denver, CO
| | - Ashley M Buckle
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
- PTNG Bio, Melbourne, Victoria, Australia
| | - Arnav Gupta
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, CO
- Department of Medicine, National Jewish Health, Denver, CO
| | | | - Shaun Bevers
- Biophysics Core Facility, University of Colorado School of Medicine, Aurora, CO
| | | | - Kevin Kim
- Department of Academic Affairs, National Jewish Health, Denver, CO
| | - Zhihong Feng
- Department of Respiratory Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Kathrin Spendier
- Department of Physics & Energy Science, University of Colorado, Colorado Springs, CO
- BioFrontiers Center, University of Colorado, Colorado Springs, CO; and
| | - Guy Hagen
- Department of Physics & Energy Science, University of Colorado, Colorado Springs, CO
- BioFrontiers Center, University of Colorado, Colorado Springs, CO; and
| | | | | | - Monika Dzieciatkowska
- Proteomic Mass Spectrometry Facility, University of Colorado School of Medicine, Aurora, CO
| | | | - Anthony N Gerber
- Department of Immunology and Genomic Medicine, National Jewish Health, Denver, CO
- Department of Medicine, National Jewish Health, Denver, CO
| | - Edward D Chan
- Department of Medicine, Rocky Mountain Regional Veterans Affairs Medical Center, Denver, CO;
- Department of Academic Affairs, National Jewish Health, Denver, CO
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine, Aurora, CO
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Liu Z, Andraska E, Akinbode D, Mars W, Alvidrez RIM. LRP1 in the Vascular Wall. CURRENT PATHOBIOLOGY REPORTS 2022. [DOI: 10.1007/s40139-022-00231-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Segal L, Lewis EC. The Lipid Ties of α1-antitrypsin: Structural and Functional Aspects. Cell Immunol 2022; 375:104528. [DOI: 10.1016/j.cellimm.2022.104528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 04/12/2022] [Accepted: 04/12/2022] [Indexed: 01/01/2023]
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Differential signaling patterns of stimulated bone marrow-derived dendritic cells under α1-antitrypsin-enriched conditions. Cell Immunol 2021; 361:104281. [PMID: 33453508 DOI: 10.1016/j.cellimm.2020.104281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 07/17/2020] [Accepted: 11/21/2020] [Indexed: 11/22/2022]
Abstract
Dendritic cells (DCs) mature upon an inflammatory trigger. However, an inflammatory trigger can lead to a semi-mature phenotype, allowing DCs to evoke tolerance and expedite the resolution of inflammation. This duality likely involves context-dependent modulation of inflammatory signaling. Human α1-antitrypsin (hAAT) promotes semimature DCs. We examined changes in a wide spectrum of signaling cascades in stimulated murine bone marrow-derived cells with hAAT. Upon stimulation by IL-1β+IFNγ, hAAT-treated cells depicted an attenuated calcium flux. Disrupting PKA or NF-κB pathways revoked only some hAAT-mediated outcomes. hAAT-treated cells exhibited a distict pattern of kinase phosphorylation. hAAT-mediated increase in Treg cells in-vitro required intact inflammatory signaling pathways. Taken together, hAAT appears to require a stimulated microenvironment to promote inflammatory resolution, setting it aside from classical anti-inflammatory agents. Further studies are required to identify the specific molecules targeted by hAAT that mediate these and other outcomes.
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7
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Lior Y, Jasevitch M, Ochayon DE, Zaretsky M, Lewis EC, Aharoni A. Application of directed evolution and back-to-consensus algorithms to human alpha1-antitrypsin leads to diminished anti-protease activity and augmented anti-inflammatory activities. Cell Immunol 2020; 355:104135. [PMID: 32703529 DOI: 10.1016/j.cellimm.2020.104135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 05/14/2020] [Accepted: 05/18/2020] [Indexed: 12/21/2022]
Abstract
Primarily known as an elastase inhibitor, human alpha1-antitrypsin also exerts anti-inflammatory and immunomodulatory effects, both in vitro and in vivo. While the anti-protease mechanism of alpha1-antitrypsin is attributed to a particular protein domain coined the reactive center loop, anti-inflammatory and immunomodulatory loci within the molecule remain to be identified. In the present study, directed evolution and back-to-consensus algorithms were applied to human alpha1-antitrypsin. Six unique functional candidate sites were identified on the surface of the molecule; in manipulating these sites by point mutations, a recombinant mutant form of alpha1-antitrypsin was produced, depicting a requirement for sites outside the reactive center loop as essential for protease inhibition, and displaying enhanced anti-inflammatory activities. Taken together, outcomes of the present study establish a potential use for directed evolution in advancing our understanding of site-specific protein functions, offering a platform for development of context- and disease-specific alpha1-antitrypsin-based therapeutics.
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Affiliation(s)
- Yotam Lior
- Department of Clinical Biochemistry & Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be'er Sheva, Israel.
| | - Maria Jasevitch
- Department of Clinical Biochemistry & Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be'er Sheva, Israel
| | - David E Ochayon
- Department of Clinical Biochemistry & Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be'er Sheva, Israel
| | - Mariana Zaretsky
- Department of Life Sciences, Ben-Gurion University of the Negev and National Institute for Biotechnology, Be'er Sheva, Israel
| | - Eli C Lewis
- Department of Clinical Biochemistry & Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Be'er Sheva, Israel
| | - Amir Aharoni
- Department of Life Sciences, Ben-Gurion University of the Negev and National Institute for Biotechnology, Be'er Sheva, Israel
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Ercetin E, Richtmann S, Delgado BM, Gomez-Mariano G, Wrenger S, Korenbaum E, Liu B, DeLuca D, Kühnel MP, Jonigk D, Yuskaeva K, Warth A, Muley T, Winter H, Meister M, Welte T, Janciauskiene S, Schneider MA. Clinical Significance of SERPINA1 Gene and Its Encoded Alpha1-antitrypsin Protein in NSCLC. Cancers (Basel) 2019; 11:cancers11091306. [PMID: 31487965 PMCID: PMC6770941 DOI: 10.3390/cancers11091306] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 08/29/2019] [Accepted: 09/02/2019] [Indexed: 12/20/2022] Open
Abstract
High expression of SERPINA1 gene encoding acute phase protein, alpha1-antitrypsin (AAT), is associated with various tumors. We sought to examine the significance of SERPINA1 and AAT protein in non-small-cell lung cancer (NSCLC) patients and NSCLC cell lines. Tumor and adjacent non-tumor lung tissues and serum samples from 351 NSCLC patients were analyzed for SERPINA1 expression and AAT protein levels. We also studied the impact of SERPINA1 expression and AAT protein on H1975 and H661 cell behavior, in vitro. Lower SERPINA1 expression in tumor but higher in adjacent non-tumor lung tissues (n = 351, p = 0.016) as well as higher serum levels of AAT protein (n = 170, p = 0.033) were associated with worse survival rates. Specifically, in NSCLC stage III patients, higher blood AAT levels (>2.66 mg/mL) correlated with a poor survival (p = 0.002). Intriguingly, levels of serum AAT do not correlate with levels of C-reactive protein, neutrophils-to-leukocyte ratio, and do not correlate with SERPINA1 expression or AAT staining in the tumor tissue. Additional experiments in vitro revealed that external AAT and/or overexpressed SERPINA1 gene significantly improve cancer cell migration, colony formation and resistance to apoptosis. SERPINA1 gene and AAT protein play an active role in the pathogenesis of lung cancer and not just reflect inflammatory reaction related to cancer development.
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Affiliation(s)
- Evrim Ercetin
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - Sarah Richtmann
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
- Translational Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), 69120 Heidelberg, Germany.
| | - Beatriz Martinez Delgado
- Department of Molecular Genetics. Institute of Health Carlos III. Center for Biomedical Research in the Network of Rare Diseases (CIBERER), 28220 Majadahonda (Madrid), Spain.
| | - Gema Gomez-Mariano
- Department of Molecular Genetics. Institute of Health Carlos III. Center for Biomedical Research in the Network of Rare Diseases (CIBERER), 28220 Majadahonda (Madrid), Spain.
| | - Sabine Wrenger
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - Elena Korenbaum
- Institute of Biophysical Chemistry and Anatomy, Hannover Medical School, 30625 Hannover, Germany.
| | - Bin Liu
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - David DeLuca
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - Mark P Kühnel
- Institute of Pathology, Hannover Medical School, 30625 Hannover, Germany.
| | - Danny Jonigk
- Institute of Pathology, Hannover Medical School, 30625 Hannover, Germany.
| | - Kadriya Yuskaeva
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
| | - Arne Warth
- Institute of Pathology, Heidelberg University Hospital, D-69120 Heidelberg, Germany.
| | - Thomas Muley
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
- Translational Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), 69120 Heidelberg, Germany.
| | - Hauke Winter
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
- Department of Surgery, Thoraxklinik at Heidelberg University Hospital, D-69126 Heidelberg, Germany.
| | - Michael Meister
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
- Translational Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), 69120 Heidelberg, Germany.
| | - Tobias Welte
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - Sabina Janciauskiene
- Department of Respiratory Medicine, Hannover Medical School, 30625 Hannover, Germany.
- Biomedical Research in Endstage and Obstructive Lung Disease Hannover (BREATH), Member of the German Center for Lung Research (DZL), 30625 Hannover, Germany.
| | - Marc A Schneider
- Translational Research Unit, Thoraxklinik at Heidelberg University Hospital, 69126 Heidelberg, Germany.
- Translational Research Center Heidelberg (TLRC), Member of the German Center for Lung Research (DZL), 69120 Heidelberg, Germany.
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Wang J, Gou W, Kim DS, Strange C, Wang H. Clathrin-mediated Endocytosis of Alpha-1 Antitrypsin is Essential for its Protective Function in Islet Cell Survival. Am J Cancer Res 2019; 9:3940-3951. [PMID: 31281523 PMCID: PMC6587339 DOI: 10.7150/thno.31647] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 04/01/2019] [Indexed: 12/28/2022] Open
Abstract
Cytokine-induced pancreatic β cell death plays a pivotal role in both type 1 and type 2 diabetes. Our previous study showed that alpha-1 antitrypsin (AAT) inhibits β cell death through the suppression of cytokine-induced c-Jun N-terminal kinase (JNK) activation in an islet transplantation model. The aim of this study was to further understand how AAT impacts β cells by studying AAT endocytosis in human islets and a βTC3 murine insulinoma cell line. Methods: In vitro, human islets and βTC3 cells were stimulated with cytokines in the presence or absence of chlorpromazine (CPZ), a drug that disrupts clathrin-mediated endocytosis. Western blot, real-time PCR and cell death ELISA were performed to investigate β cell death. The oxygen consumption rate (OCR) was measured on human islets. In vivo, islets were harvested from C57BL/6 donor mice treated with saline or human AAT and transplanted into the livers of syngeneic mice that had been rendered diabetic by streptozotocin (STZ). Islet graft survival and function were analyzed. Results: AAT was internalized by β cells in a time- and dose-dependent manner. AAT internalization was mediated by clathrin as treatment with CPZ, profoundly decreased AAT internalization, cytokine-induced JNK activation and the downstream upregulation of c-Jun mRNA expression. Similarly, addition of CPZ attenuated cytokine-induced caspase 9 cleavage (c-casp 9) and DNA fragmentation, which was suppressed by AAT. Treatment of donor mice with AAT produced AAT internalization in islets, and resulted in a higher percentage of recipients reaching normoglycemia after syngeneic intraportal islet transplantation. Conclusion: Our results suggest that AAT is internalized by β cells through clathrin-mediated endocytosis that leads to the suppression of caspase 9 activation. This process is required for the protective function of AAT in islets when challenged with proinflammatory cytokines or after islet transplantation.
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Kaner Z, Engelman R, Schuster R, Rider P, Greenberg D, Av-Gay Y, Benhar M, Lewis EC. S-Nitrosylation of α1-Antitrypsin Triggers Macrophages Toward Inflammatory Phenotype and Enhances Intra-Cellular Bacteria Elimination. Front Immunol 2019; 10:590. [PMID: 31001247 PMCID: PMC6454134 DOI: 10.3389/fimmu.2019.00590] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/05/2019] [Indexed: 01/01/2023] Open
Abstract
Background: Human α1-antitrypsin (hAAT) is a circulating anti-inflammatory serine-protease inhibitor that rises during acute phase responses. in vivo, hAAT reduces bacterial load, without directly inhibiting bacterial growth. In conditions of excess nitric-oxide (NO), hAAT undergoes S-nitrosylation (S-NO-hAAT) and gains antibacterial capacity. The impact of S-NO-hAAT on immune cells has yet to be explored. Aim: Study the effects of S-NO-hAAT on immune cells during bacterial infection. Methods: Clinical-grade hAAT was S-nitrosylated and then compared to unmodified hAAT, functionally, and structurally. Intracellular bacterial clearance by THP-1 macrophages was assessed using live Salmonella typhi. Murine peritoneal macrophages were examined, and signaling pathways were evaluated. S-NO-hAAT was also investigated after blocking free mambranal cysteine residues on cells. Results: S-NO-hAAT (27.5 uM) enhances intracellular bacteria elimination by immunocytes (up to 1-log reduction). S-NO-hAAT causes resting macrophages to exhibit a pro-inflammatory and antibacterial phenotype, including release of inflammatory cytokines and induction of inducible nitric oxide synthase (iNOS) and TLR2. These pro-inflammatory effects are dependent upon cell surface thiols and activation of MAPK pathways. Conclusions: hAAT duality appears to be context-specific, involving S-nitrosylation in a nitric oxide rich environment. Our results suggest that S-nitrosylation facilitates the antibacterial activity of hAAT by promoting its ability to activate innate immune cells. This pro-inflammatory effect may involve transferring of nitric oxide from S-NO-hAAT to a free cysteine residue on cellular targets.
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Affiliation(s)
- Ziv Kaner
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Rotem Engelman
- Department of Biochemistry, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Ronen Schuster
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Peleg Rider
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - David Greenberg
- The Pediatric Infectious Disease Unit, Soroka University Medical Center, Beer-Sheva, Israel
| | - Yossef Av-Gay
- Division of Infectious Diseases, Departments of Medicine and Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, BC, Canada
| | - Moran Benhar
- Department of Biochemistry, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Eli C Lewis
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Stephenson SE, Wilson CL, Crothers K, Attia EF, Wongtrakool C, Petrache I, Schnapp LM. Impact of HIV infection on α 1-antitrypsin in the lung. Am J Physiol Lung Cell Mol Physiol 2017; 314:L583-L592. [PMID: 29351445 DOI: 10.1152/ajplung.00214.2017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Emphysema is one of the most common lung diseases in HIV+ individuals. The pathogenesis of HIV-associated emphysema remains unclear; however, radiographic distribution and earlier age of presentation of emphysema in the lungs of HIV+ patients are similar to deficiency of α1-antitrypsin (A1AT), a key elastase inhibitor in the lung. Reduced levels of circulating A1AT in HIV+ patients suggest a potential mechanism for emphysema development. In the present study we asked if A1AT levels and activity in the bronchoalveolar lavage fluid (BALF) differ in HIV+ and HIV- patients with and without emphysema. A1AT levels were measured by ELISA in plasma and BALF from a cohort of 21 HIV+ and 29 HIV- patients with or without emphysematous changes on chest CT scan. To analyze A1AT function, we measured elastase activity in the BALF and assessed oxidation and polymerization of A1AT by Western blotting. Total A1AT was increased in the BALF, but not in the plasma, of HIV+ compared with HIV- patients, regardless of the presence or absence of emphysema. However, antielastase activity was decreased in BALF from HIV+ patients, suggesting impaired A1AT function. Higher levels of the oxidized form of A1AT were detected in BALF from HIV+ than HIV- patients, which may account for the decreased antielastase activity. These findings suggest that, in the lungs of HIV+ patients, posttranslational modifications of A1AT produce a "functional deficiency" of this critical elastase inhibitor, which may contribute to emphysema development.
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Affiliation(s)
- Sarah E Stephenson
- Pulmonary, Critical Care, Allergy, and Sleep Medicine, Medical University of South Carolina , Charleston, South Carolina
| | - Carole L Wilson
- Pulmonary, Critical Care, Allergy, and Sleep Medicine, Medical University of South Carolina , Charleston, South Carolina
| | - Kristina Crothers
- Pulmonary and Critical Care Medicine, University of Washington , Seattle, Washington
| | - Engi F Attia
- Pulmonary and Critical Care Medicine, University of Washington , Seattle, Washington
| | - Cherry Wongtrakool
- Pulmonary Section, Department of Veterans Affairs, Atlanta Veterans Affairs Medical Center, Decatur, Georgia.,Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, Department of Medicine, Emory University , Atlanta, Georgia
| | - Irina Petrache
- Pulmonary, Critical Care, and Sleep Medicine, National Jewish Health, University of Colorado , Denver, Colorado
| | - Lynn M Schnapp
- Pulmonary, Critical Care, Allergy, and Sleep Medicine, Medical University of South Carolina , Charleston, South Carolina
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Wahlmüller FC, Yang H, Furtmüller M, Geiger M. Regulation of the Extracellular SERPINA5 (Protein C Inhibitor) Penetration Through Cellular Membranes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017. [PMID: 28639251 DOI: 10.1007/5584_2017_60] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It is generally accepted that the phospholipid bilayer of the cell membrane is impermeable for proteins and peptides and that these molecules require special mechanisms for their transport from the extra- to the intracellular space. Recently there is increasing evidence that certain proteins/peptides can also directly cross the phospholipid membrane. SERPINA5 (protein C inhibitor) is a secreted protease inhibitor with broad protease reactivity and wide tissue distribution. It binds glycosaminoglycans and certain phospoholipids, which can modulate its inhibitory activity. SERPINA5 has been shown to be internalized by platelets, granulocytes, HL-60 promyelocytic leukemia cells, and by Jurkat lymphoma cells. Once inside the cell it can translocate to the nucleus. There are several indications that SERPINA5 can directly cross the phospholipid bilayer of the cell membrane. In this review we will describe what is known so far about the conditions, as well as the cellular and molecular requirements for SERPINA5 translocation through the cell membrane and for its penetration of pure phospholipid vesicles.
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Affiliation(s)
- Felix C Wahlmüller
- Department of Vascular Biology and Thrombosis Research, Center of Physiology and Pharmacology, Medical University Vienna, Schwarzspanierstrasse 17, 1090, Vienna, Austria
| | - Hanjiang Yang
- Department of Vascular Biology and Thrombosis Research, Center of Physiology and Pharmacology, Medical University Vienna, Schwarzspanierstrasse 17, 1090, Vienna, Austria
| | - Margareta Furtmüller
- Department of Vascular Biology and Thrombosis Research, Center of Physiology and Pharmacology, Medical University Vienna, Schwarzspanierstrasse 17, 1090, Vienna, Austria
| | - Margarethe Geiger
- Department of Vascular Biology and Thrombosis Research, Center of Physiology and Pharmacology, Medical University Vienna, Schwarzspanierstrasse 17, 1090, Vienna, Austria.
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Baranovski BM, Ozeri E, Shahaf G, Ochayon DE, Schuster R, Bahar N, Kalay N, Cal P, Mizrahi MI, Nisim O, Strauss P, Schenker E, Lewis EC. Exploration of α1-antitrypsin treatment protocol for islet transplantation: dosing plan and route of administration. J Pharmacol Exp Ther 2016; 359:482-490. [PMID: 27821710 PMCID: PMC5118642 DOI: 10.1124/jpet.116.236067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 09/14/2016] [Accepted: 09/15/2016] [Indexed: 12/13/2022] Open
Abstract
Lifelong weekly infusions of human α1-antitrypsin (hAAT) are currently administered as augmentation therapy for patients with genetic AAT deficiency (AATD). Several recent clinical trials attempt to extend hAAT therapy to conditions outside AATD, including type 1 diabetes. Because the endpoint for AATD is primarily the reduction of risk for pulmonary emphysema, the present study explores hAAT dose protocols and routes of administration in attempt to optimize hAAT therapy for islet-related injury. Islet-grafted mice were treated with hAAT (Glassia; intraperitoneally or subcutaneously) under an array of clinically relevant dosing plans. Serum hAAT and immunocyte cell membrane association were examined, as well as parameters of islet survival. Results indicate that dividing the commonly prescribed 60 mg/kg i.p. dose to three 20 mg/kg injections is superior in affording islet graft survival; in addition, a short dynamic descending dose protocol (240→120→60→60 mg/kg i.p.) is comparable in outcomes to indefinite 60 mg/kg injections. Although pharmacokinetics after intraperitoneal administration in mice resembles exogenous hAAT treatment in humans, subcutaneous administration better imitated the physiologic progressive rise of hAAT during acute phase responses; nonetheless, only the 60 mg/kg dose depicted an advantage using the subcutaneous route. Taken together, this study provides a platform for extrapolating an islet-relevant clinical protocol from animal models that use hAAT to protect islets. In addition, the study places emphasis on outcome-oriented analyses of drug efficacy, particularly important when considering that hAAT is presently at an era of drug-repurposing toward an extended list of clinical indications outside genetic AATD.
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Zhou X, Liu Z, Zhang J, Adelsberger JW, Yang J, Burton GF. Alpha-1-antitrypsin interacts with gp41 to block HIV-1 entry into CD4+ T lymphocytes. BMC Microbiol 2016; 16:172. [PMID: 27473095 PMCID: PMC4966588 DOI: 10.1186/s12866-016-0751-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 06/15/2016] [Indexed: 02/06/2023] Open
Abstract
Background Study of a clinic case reveals that alpha-1-antitrypsin (AAT) deficiency is related to CD4+ T cell count decline and AIDS progression, suggesting that AAT might be an endogenous inhibitor of HIV/AIDS. Previous study shows that AAT inhibits HIV-1 replication in infected host cells and the C-terminus fragment of AAT, VIRIP, interferes with HIV-1 infection. However, it is still unclear whether and how intact AAT inhibits HIV-1 infection. It is also unknown what the mechanism of AAT is and which critical step(s) are involved. Results In the present study, the C-terminus of AAT (C) was synthesized. C terminus-truncated AAT (ΔAAT) was also prepared by digesting AAT with metalloproteinase. Primary CD4+ T cells were then co-cultured with HIV-1 with the presence or absence of AAT/C/ΔAAT to detect cis-infection of HIV-1. The interaction between AAT/C/ΔAAT and gp120/gp41 was also measured. Meanwhile, HIV-1 reverse transcriptase activity and viral DNA integration were also detected in these lymphocytes. The results demonstrated that AAT and C, not ΔAAT, inhibited HIV-1 entry by directly interacting with gp41. Meanwhile, AAT, C and ΔAAT could not directly interfere with the steps of viral RNA reverse transcription and viral DNA integration. Conclusion AAT inhibits HIV-1 entry by directly interacting with gp41 through its C-terminus and thereby inhibits HIV-1 infection. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0751-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xueyuan Zhou
- Clinic Services Program, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA.
| | - Zhu Liu
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Agriculture, Hainan University, Haikou, Hainan, 570228, China.
| | - Jun Zhang
- Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Joseph W Adelsberger
- Clinic Services Program, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Jun Yang
- Clinic Services Program, Leidos Biomedical Research Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Gregory F Burton
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
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