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Ahmadi TS, Behrouz B, Mousavi Gargari SL. Polyclonal anti-whole cell IgY passive immunotherapy shields against P. aeruginosa-induced acute pneumonia and burn wound infections in murine models. Sci Rep 2024; 14:405. [PMID: 38172232 PMCID: PMC10764880 DOI: 10.1038/s41598-023-50859-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 12/27/2023] [Indexed: 01/05/2024] Open
Abstract
Pseudomonas aeruginosa (PA) is a multidrug-resistant (MDR) opportunistic pathogen causing severe hospital-, and community-acquired infections worldwide. Thus, the development of effective immunotherapy-based treatments is essential to combat the MDR-PA infections. In the current study, we evaluated the protective efficacy of polyclonal avian antibodies raised against inactivated whole cells of the PAO1 strain in murine models of acute pneumonia and burn wound. The efficacy of generated antibodies was evaluated against different PA strains through several in vitro, ex vivo and in vivo experiments. The results showed that the anti-PAO1-IgY effectively reduced the motility, biofilm formation and cell internalization ability, and enhanced the opsonophagocytic killing of PA strains through the formation of immobilized bacteria and induction of increased cell surface hydrophobicity. Furthermore, immunotherapy with anti-PAO1-IgY completely protected mice against all PA strains in both acute pneumonia and burn wound murine models. It was found to reduce the bacterial loads in infected burned mice through interfering with virulence factors that play vital roles in the early stages of PA infection, such as colonization and cell internalization. The immunotherapy with anti-PAO1-IgYs could be instrumental in developing effective therapies aimed at reducing the morbidity and mortality associated with PA infections.
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Affiliation(s)
- Tooba Sadat Ahmadi
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Express Way, Tehran, 3319118651, Iran
| | - Bahador Behrouz
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Express Way, Tehran, 3319118651, Iran
| | - Seyed Latif Mousavi Gargari
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Express Way, Tehran, 3319118651, Iran.
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Rezaei Adriani R, Mousavi Gargari SL, Bakherad H, Amani J. Anti-EGFR bioengineered bacterial outer membrane vesicles as targeted immunotherapy candidate in triple-negative breast tumor murine model. Sci Rep 2023; 13:16403. [PMID: 37775519 PMCID: PMC10541432 DOI: 10.1038/s41598-023-43762-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 09/28/2023] [Indexed: 10/01/2023] Open
Abstract
Cancer immunotherapy employing checkpoint inhibitors holds great promise across diverse cancers; nonetheless, a substantial proportion of patients (ranging from 55 to 87%) remain unresponsive to this treatment. To amplify therapeutic efficiency, we propose a synergistic therapeutic strategy that entails the deployment of targeted nano-sized particles carrying Toll-like receptor (TLR) agonists to the tumor site. This innovative approach seeks to activate intratumoral antigen-presenting cells using bioengineered outer membrane vesicles (OMVs) derived from gram-negative bacteria. These OMVs possess inherent attributes of surface-exposed immune stimulators and TLR-activating components, rendering them intriguing candidates for investigation. These OMVs were meticulously designed to selectively target cancer cells exhibiting an overexpression of epidermal growth factor receptor (EGFR). To gauge the precision of this targeting, the conducted affinity-based assays aimed at determining the equilibrium dissociation constant of the single-chain variable fragment employed for this purpose. In vitro experiments confirmed the OMVs' proficiency in adhering to EGFR-overexpressed cancer cells. Moreover, the evaluation extended to an in vivo context, where the therapeutic effect of nanovesicles was appraised within the tumor microenvironment of the triple-negative breast cancer mouse model. Notably, both intraperitoneal and intratumoral administrations of nanovesicles exhibited the ability to activate natural killer cells and skew M2 macrophage towards an M1 phenotype. The combined scrutiny of in vitro and in vivo findings underscores the potential efficiency of OMVs as a promising strategy for future anti-tumor endeavors.
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Affiliation(s)
| | | | - Hamid Bakherad
- Department of Pharmaceutical Biotechnology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Jafar Amani
- Applied Microbiology Research Center, System Biology, and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Zare H, Bakherad H, Nasr Esfahani A, Norouzi M, Aghamollaei H, Mousavi Gargari SL, Mahmoodi F, Aliomrani M, Ebrahimizadeh W. Introduction of a new recombinant vaccine based on GRP78 for breast cancer immunotherapy and evaluation in a mouse model. Bioimpacts 2023; 14:27829. [PMID: 38505675 PMCID: PMC10945302 DOI: 10.34172/bi.2023.27829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 07/04/2023] [Accepted: 07/29/2023] [Indexed: 03/21/2024]
Abstract
Introduction Breast cancer is one of the most prevalent malignancies in women. Several treatment options are available today, including surgery, chemotherapy, and radiotherapy. Immunotherapy, as a highly specific therapy, involves adaptive immune responses and immunological memory. In our present research, we used the recombinant C-terminal domain of the GRP78 (glucose- regulated protein 78) protein to induce an immune response and investigate its therapeutic impact in the 4T1 breast cancer model. Methods BALB/c mice were immunized with the cGRP78 protein. The humoral immune response was assessed by ELISA. Then, BALB/c mice were injected subcutaneously with 1×106 4T1 tumor cells. Subsequently, tumor size and survival rate measurements, MTT, and cytokine assays were performed. Results The animals receiving the cGRP78 vaccine showed significantly more favorable survival and slower tumor growth rates compared with unvaccinated tumor-bearing mice as the negative control mice. Circulating levels of tumoricidal cytokines such as IFNγ were higher, whereas tolerogenic cytokines such as IL-2, 6, and 10 either did not increase or had a decreasing trend in mice receiving cGRP78. Conclusion cGRP78 vaccines generated potent immunotherapeutic effects in a breast cancer mouse model. This novel strategy of targeting the GRP78 protein can promote the development of cancer vaccines and immunotherapies for breast cancer malignancies.
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Affiliation(s)
- Hamed Zare
- Recombinant Proteins Department, Breast Cancer Research Center, Motamed Cancer Institute, ACECR, Tehran, Iran
| | - Hamid Bakherad
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
- Pharmaceutical Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Arman Nasr Esfahani
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohamad Norouzi
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hossein Aghamollaei
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - Fatemeh Mahmoodi
- Department of Biology, College of Sciences, Shiraz University, Shiraz, Iran
| | - Mahdi Aliomrani
- Department of Pharmacology and Toxicology, Isfahan Pharmaceutical Science Research Center, Faculty of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Walead Ebrahimizadeh
- Department of Surgery, Division of Urology, McGill University, and the Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
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Moshref ZS, Jalali T, Rezaei Adriani R, Soltati E, Mousavi Gargari SL. Aptamer-based diagnosis of various SARS-CoV2 strains isolated from clinical specimens. Heliyon 2023; 9:e16458. [PMID: 37251485 PMCID: PMC10204341 DOI: 10.1016/j.heliyon.2023.e16458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 05/09/2023] [Accepted: 05/17/2023] [Indexed: 05/31/2023] Open
Abstract
The emergence of the SARS-CoV-2 virus, an unknown strain of coronavirus, has resulted in severe acute respiratory syndrome with high mortality rates worldwide. Due to the possibility of asymptomatic carriers, late diagnosis of infected individuals can lead to uncontrollable transmission of the disease, making early and accurate detection crucial in controlling the spread of the virus. In this study we identified high-binding-affinity aptamers targeting various strains of the SARS-CoV2 (COVID-19) virus, using the GO-Cell-SELEX (Graphene Oxide- Systematic Evolution of Ligands by Exponential Enrichment) strategy. A total of 96 aptamers were developed through 11 rounds of GO-Cell-SELEX from a random 40 nucleotide single-strand DNA (ssDNA) aptamer library. Using the surface plasmon resonance (SPR) method, the dissociation constant (Kd) values of all aptamers were calculated and two aptamers 52 and 91 with Kd 50 and 61 were selected for enzyme-linked apta-sorbent assay (ELASA). Aptamer 91 could detect various strains of the virus in above 97% of clinical samples obtained from nasopharyngeal swaps (NPS) specimens kept in viral transport media (VTM), confirmed by real-time PCR assay at COVID-19 Reference Diagnostic Laboratory of Iran, Pasture Institute. Aptamer 52 could detect the SARS-CoV2 virus in a competitive lateral flow assay (LFA) to be considered for a future designed kit. These two simple, specific, and sensitive tests can be used in combination for rapid and early diagnosis of various strains of the COVID-19 virus. Our results suggest that these two discovered aptamers present an opportunity for developing a new rapid aptamer-based coronavirus diagnostic kit.
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Affiliation(s)
| | - Tahmineh Jalali
- Department of Arboviruses and Viral Hemorrhagic Fever (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
| | | | - Elahe Soltati
- Faculty of Converging Science and Technologies, Islamic Azad University, Science and Research Branch, Tehran, Iran
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Mohammadkhani F, Mousavi Gargari SL, Nazarian S, Mafi M. Protective effects of anti-CfaB-EtpA-LTB IgY antibody against adherence and toxicity of enterotoxigenic Escherichia coli (ETEC). J Appl Microbiol 2023; 134:6994376. [PMID: 36662123 DOI: 10.1093/jambio/lxad013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 12/13/2022] [Accepted: 01/19/2023] [Indexed: 01/21/2023]
Abstract
AIM Production of IgY antibodies against CfaB-EtpA-LTB (CEL) chimeric protein and evaluation of its protective effects against enterotoxigenic Escherichia coli (ETEC) by in vivo and in vitro investigation. METHODS AND RESULTS Indirect ELISA and immunoblotting methods were applied to assess the immunogenicity and specificity of IgYs and also to evaluate the efficacy of IgYs in binding prevention and neutralizing the heat-labile (LT) toxin of ETEC bacteria. The results indicated that the anti-CEL IgY at a concentration of 2 mg ml-1 could decrease the bacterial adhesion to HT-29 cells by 74% compared to the control group.At a concentration of 750 μg ml-1, the IgY antibody managed to neutralize the disruptive LT toxin effect on the Y1 cell line. At a concentration of 2 mg ml-1, 81% reduction was observed in the fluid accumulation in the ileal loop assay. CONCLUSION According to our findings, passive immunotherapy with anti-CEL IgY can prevent bacterial colonization and toxicity, thus facilitating in controlling the enteric diseases caused by ETEC infection.
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Affiliation(s)
| | | | - Shahram Nazarian
- Department of Biology, Faculty of Basic Science, Imam Hossein University, Tehran, 1651155017, Iran
| | - Maryam Mafi
- Department of Biology, Shahed University, Tehran, 3319118651, Iran
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Rezaei A, Nazarian S, Samiei Abianeh H, Kordbacheh E, Alizadeh Z, Mousavi Gargari SL. Antibodies Produced Toward Recombinant RBD and Nucleocapsid Neutralize SARS-COV-2. Avicenna J Med Biotechnol 2022. [DOI: 10.18502/ajmb.v14i4.10481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background: The highly contagious SARS-COV-2 virus spread rapidly from China and formed a global pandemic. The virus has infected over 509 million people worldwide and killed about 6.32 million up to date. Up on invasion, the Receptor Binding Domain (RBD) of Spike protein plays a crucial role in the entry of the virus into the host cell. The virus N protein is another protein that has a critical role for genome packaging.
Methods: As bioinformatics approaches, the cassette design, codon adaptation, and protein stability were investigated in this study. Synthetic genes of RBD and N were cloned separately in pET28a + expression vector. They were transferred into Escherichia coli (E. coli) BL21 DE3 host cell, and expression of recombinant proteins was induced with IPTG. The recombinant proteins were purified by column chromatography and approved by Western blotting. Animal immunization was performed with each of the recombinant proteins individually and in combination of the two. The antibody titer of the blood serum from control and immunized mice groups was determined by ELISA technique. Finally, the anti-spike neutralization test was performed.
Results: The expression and purification of RBD protein were monitored on SDS-PAGE, two bands of about 28 and 45 kDa for RBD and N appeared on gel distinctly, which were further validated by Western blotting. According to ELISA results, related antibodies were traced to a dilution of 1/64000 in immunized sera. The neutralization test exhibited produced antibodies' potency to bind the virus proteins. Using SPSS software, statistical analysis was performed by Duncan's test and T-test.
Conclusion: According to the present study, recombinant proteins, either RBD alone or in combination with N adequately stimulated the immune response, and the raised antibodies could neutralize the virus in in vitro test.
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Arshadi N, Mousavi Gargari SL, Amani J, Nazarian S. Immunogenicity of inactivated Escherichia coli O157:H7 with Stx2B microparticle in mice. Iran J Basic Med Sci 2022; 25:1069-1076. [PMID: 36246065 PMCID: PMC9526885 DOI: 10.22038/ijbms.2022.63775.14053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 08/21/2022] [Indexed: 11/05/2022]
Abstract
Objectives Vaccination using inactivated bacteria is one of the most effective ways to protect against EHEC infection. Escherichia coli O157:H7 infections are mainly influenced by Shiga toxins (Stx) and attaching/effacing factors. Among various factors, Stx2B is gaining much attention as a vaccine candidate. Formulating an inactivated bacteria with a suitable adjuvant increases vaccine efficacy and antibody production and can lead to a lasting immune response and protection against O157:H7. Materials and Methods To assess vaccine efficacy, in this study, we have considered heat and formalin-inactivated bacteria along with chitosan-coated Stx2B/ Stx2B in a mouse model. Ionotropic gelation via tripolyphosphate anions was used to coat Stx2B on chitosan. Subcutaneous injection or oral gavage was used to immunize mice, which were then challenged with E. coli O157:H7. Results Immunity and protection against E. coli O157:H7 were achieved by all forms of the vaccine. Inactivated E. coli O157:H7 formulated with chitosan-coated Stx2B effectively evoked humoral and mucosal immune responses. However, minimum shedding appeared with the mice groups orally immunized with formalin-inactivated bacteria sublimated with chitosan-coated Stx2B and heat-inactivated bacteria plus Stx2B in subcutaneous immunization. Conclusion Administration of inactivated whole-cell and toxin was synergistic and increased the protection capacity with both parenteral and oral immunization routes.
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Affiliation(s)
- Nasim Arshadi
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | - Seyed Latif Mousavi Gargari
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran,Corresponding author: Seyed Latif Mousavi Gargari. Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Highway, Tehran, Iran. Tel: +98-21-51212232;
| | - Jafar Amani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Zareitaher T, Sadat Ahmadi T, Latif Mousavi Gargari S. Immunogenic efficacy of DNA and protein-based vaccine from a chimeric gene consisting OmpW, TcpA and CtxB, ofVibrio cholerae. Immunobiology 2022; 227:152190. [DOI: 10.1016/j.imbio.2022.152190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 01/30/2022] [Accepted: 02/12/2022] [Indexed: 11/16/2022]
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9
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Rezaei A, Nazarian S, Samiei Abianeh H, Kordbacheh E, Alizadeh Z, Mousavi Gargari SL. Antibodies Produced Toward Recombinant RBD and Nucleocapsid Neutralize SARS-COV-2. Avicenna J Med Biotechnol 2022; 14:270-277. [PMID: 36504571 PMCID: PMC9706246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 05/30/2022] [Indexed: 12/15/2022] Open
Abstract
Background The highly contagious SARS-COV-2 virus spread rapidly from China and formed a global pandemic. The virus has infected over 509 million people worldwide and killed about 6.32 million up to date. Up on invasion, the Receptor Binding Domain (RBD) of Spike protein plays a crucial role in the entry of the virus into the host cell. The virus N protein is another protein that has a critical role for genome packaging. Methods As bioinformatics approaches, the cassette design, codon adaptation, and protein stability were investigated in this study. Synthetic genes of RBD and N were cloned separately in pET28a + expression vector. They were transferred into Escherichia coli (E. coli) BL21 DE3 host cell, and expression of recombinant proteins was induced with IPTG. The recombinant proteins were purified by column chromatography and approved by Western blotting. Animal immunization was performed with each of the recombinant proteins individually and in combination of the two. The antibody titer of the blood serum from control and immunized mice groups was determined by ELISA technique. Finally, the anti-spike neutralization test was performed. Results The expression and purification of RBD protein were monitored on SDS-PAGE, two bands of about 28 and 45 kDa for RBD and N appeared on gel distinctly, which were further validated by Western blotting. According to ELISA results, related antibodies were traced to a dilution of 1/64000 in immunized sera. The neutralization test exhibited produced antibodies' potency to bind the virus proteins. Using SPSS software, statistical analysis was performed by Duncan's test and T-test. Conclusion According to the present study, recombinant proteins, either RBD alone or in combination with N adequately stimulated the immune response, and the raised antibodies could neutralize the virus in in vitro test.
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Affiliation(s)
- Amir Rezaei
- Department of Biology, Shahed University, Tehran, Iran
| | - Shahram Nazarian
- Molecular Biotechnology Research Center and Department of Biology, Imam Hussein University, Tehran, Iran,Corresponding authors: Shahram Nazarian, Ph.D., Molecular Biotechnology Research Center and Department of Biology, Imam Hussein University, Tehran, Iran; Seyed Latif Mousavi Gargari, Ph.D., Department of Biology, Shahed University, Tehran, Iran, Tel: +98 21 51212232, Fax: +98 21 51212232, E-mail:,
| | | | - Emad Kordbacheh
- Department of Biology, Imam Hussein University, Tehran, Iran
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Shabani S, Moghadam MF, Gargari SLM. Isolation and characterization of a novel GRP78-specific single-chain variable fragment (scFv) using ribosome display method. Med Oncol 2021; 38:115. [PMID: 34390413 DOI: 10.1007/s12032-021-01561-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 07/18/2021] [Indexed: 01/07/2023]
Abstract
Glucose-regulated protein 78 (GRP78) is a well-characterized endoplasmic reticulum (ER) chaperon frequently overexpressed at the surface of tumor cells and associated with tumor survival, metastasis, and chemoresistance. Hence, potential GRP78 binders emerge as promising candidates for cancer therapy and diagnosis. We applied ribosome display to isolate a single-chain variable domain (scFv) specific for the C-terminal domain of a recombinant human GRP78 (CGRP). Six female BALB/c mice were immunized and then splenocyte mRNA was extracted. An scFv-ribosome display library was established by joining the amplified VH/Vκ fragments through a 72-bp linker using overlap extension PCR. Then, selection was performed by applying two rounds of eukaryotic ribosome display panning with stepwise decreased amount of CGRP. Ultimately, the selected scFv was characterized using the indirect-ELISA assay, competitive-ELISA assay, Western blotting, Surface Plasmon Resonance (SPR), and in-silico analyses. The constructed library had a length of ~ 1100 bp and the high-affinity scFvs were isolated using the outputs of the final panning round. Among 60 positive clones, GSF3 was selected and its expression, purification, and binding capacity was confirmed by SDS-PAGE and Western blotting. GSF3 exhibited an affinity of 13 × 107 M-1 to CGRP as assessed by SPR. Moreover, the in-silico analyses indicated that GSF3 binds the C-terminal domain of GRP78 through key residues engaged in antibody-antigen interactions. We found that ribosome display is a swift and reliable technique for specific and high-affinity scFv isolation. Moreover, our results suggest that GSF3 might be applied as a potential cancer immunotherapeutic and diagnostic tool if this approach is carefully followed by successful preclinical and clinical evaluations to validate the findings for further confirmation.
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Affiliation(s)
- Shima Shabani
- Department of Medical Biotechnology, Faculty of Medical Sciences, Tarbiat Modares University, P.O. Box 14115/111, Tehran, Iran
| | - Mehdi Forouzandeh Moghadam
- Department of Medical Biotechnology, Faculty of Medical Sciences, Tarbiat Modares University, P.O. Box 14115/111, Tehran, Iran.
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Emami Mahmoudabadi FS, Vakili A, Nazarian S, Amani J, Mousavi Gargari SL. Immunogenic Potency of a Chimeric Protein Comprising InvH and IpaD against Salmonella and Shigella spp. Iran J Allergy Asthma Immunol 2021; 20:484-493. [PMID: 34418902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 02/07/2021] [Indexed: 06/13/2023]
Abstract
Shigella and Salmonella cause serious problems in many subjects, including young children and the elderly, especially in developing countries. Chimeric proteins carrying immunogens increase immune response. In-silico tools are applied to design vaccine candidates. Invasion plasmid antigens D (ipaD) gene is one of the Shigella virulence factors. The N-terminal region of the IpaD plays a significant role in invading the host cell. Invasion protein H (invH) gene plays important role in bacterial adherence and entry into epithelial cells. A recombinant chimeric construct, containing IpaD and InvH was designed and used as a vaccine candidate against Shigella and Salmonella enteritidis. After bioinformatics assessments, the construct was designed, synthesized, and expressed in E.coli. Chimeric protein, IpaD, and InvH were purified with Ni-NTA chromatography. Purified proteins were confirmed with western blotting and then were injected into separate mice groups. The antibody titer was estimated with an enzyme-linked immunosorbent assay (ELISA). Mice were challenged with 10, 100, and 1000 LD50 of Salmonella, and the sereny test was performed for Shigella. The Codon adaptation index of the chimeric gene was increased to 0.84. Validation results showed that 97.9% of residues lie in the favored or additional allowed region of the Ramachandran plot. A significant antibody rise was observed in all test groups. The immunized mice with chimer and InvH could tolerate 100 LD50 of Salmonella. In the sereny test, the application of bacteria treated with immunized mice sera of both antigens showed no infection in Guinea pigs' eyes. The recombinant protein could protect animal models against Salmonella and Shigella and therefore can be considered as a suitable vaccine candidate against these two pathogens.
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Affiliation(s)
| | - Atina Vakili
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran.
| | - Shahram Nazarian
- Department of Biology, Faculty of Science, Imam Hussein University, Tehran, Iran.
| | - Jafar Amani
- Applied Microbiology Research center, System Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Jalali T, Salehi-Vaziri M, Pouriayevali MH, Gargari SLM. Aptamer based diagnosis of crimean-congo hemorrhagic fever from clinical specimens. Sci Rep 2021; 11:12639. [PMID: 34135365 PMCID: PMC8209218 DOI: 10.1038/s41598-021-91826-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 06/01/2021] [Indexed: 11/09/2022] Open
Abstract
Crimean-Congo hemorrhagic fever (CCHF) is an acute viral zoonotic disease. The widespread geographic distribution of the disease and the increase in the incidence of the disease from new regions, placed CCHF in a list of public health emergency contexts. The rapid diagnosis, in rural and remote areas where the majority of cases occur, is essential for patient management. Aptamers are considered as a specific and sensitive tool for being used in rapid diagnostic methods. The Nucleoprotein (NP) of the CCHF virus (CCHFV) was selected as the target for the isolation of aptamers based on its abundance and conservative structure, among other viral proteins. A total of 120 aptamers were obtained through 9 rounds of SELEX (Systematic Evolution of Ligands by Exponential Enrichment) from the ssDNA aptamer library, including the random 40-nucleotide ssDNA region between primer binding sites (GCCTGTTGTGAGCCTCCTAAC(N40)GGGAGACAAGAATAAGCA). The KD of aptamers was calculated using the SPR technique. The Apt33 with the highest affinity to NP was selected to design the aptamer-antibody ELASA test. It successfully detected CCHF NP in the concentration of 90 ng/ml in human serum. Evaluation of aptamer-antibody ELASA with clinical samples showed 100% specificity and sensitivity of the test. This simple, specific, and the sensitive assay can be used as a rapid and early diagnosis tool, as well as the use of this aptamer in point of care test near the patient. Our results suggest that the discovered aptamer can be used in various aptamer-based rapid diagnostic tests for the diagnosis of CCHF virus infection.
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Affiliation(s)
- Tahmineh Jalali
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran.,Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
| | - Mostafa Salehi-Vaziri
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran.,Reaserch Center for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Hassan Pouriayevali
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
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Ahmadi TS, Mousavi Gargari SL, Talei D. Anti-flagellin IgY antibodies protect against Pseudomonas aeruginosa infection in both acute pneumonia and burn wound murine models in a non-type-specific mode. Mol Immunol 2021; 136:118-127. [PMID: 34130152 DOI: 10.1016/j.molimm.2021.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/09/2021] [Accepted: 06/06/2021] [Indexed: 10/21/2022]
Abstract
Pseudomonas aeruginosa (PA) is one of the most dominant causes of nosocomial infections in burn patients. Increasing emergence of antibiotic-resistant strains highlights the need for novel antimicrobial agents. Flagellin, the main component protein of flagellum, is determined as the major antigen interacting with anti-P. aeruginosa IgY antibodies. The current study was aimed to evaluate the antibacterial potency of IgY antibodies raised against recombinant type A, and B flagellins. The immunogenicity and specificity of IgY antibodies were confirmed through indirect ELISA and western blot analysis, respectively. Anti-flagellin IgYs reduced the motility, biofilm formation and invasion potency of both strains. The cell surface hydrophobicity (CSH) of bacteria was increased upon IgY treatment, and in vitro opsonophagocytosis assay confirmed the high protective potency of specific antibodies via polymorphonuclear leukocyte (PMN)-augmented bacterial cell killing. The protective efficacy of IgYs was also studied in both acute pneumonia and burn wound murine models. Anti-flagellin B-IgY induced 100 % and 40 % protection against laboratory, and hospital strains in burn wound model, respectively. Protection in acute pneumonia against all strains was 100 %. Anti-flagellin A-IgY failed to protect mice in burn wound model, but provided 100 % protection against all strains in acute pneumonia challenge. In vitro, ex vivo and in vivo experiments confirmed the dose-dependent and non-type specific essence of anti-flagellin IgY antibodies, providing the benefit of covering all strain types in a dose dependent manner. Our findings provide evidence that anti-flagellin IgY antibodies qualify as novel economical therapeutic option against PA infection.
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Affiliation(s)
- Tooba Sadat Ahmadi
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | | | - Daryush Talei
- Medicinal Plants Research Center, Shahed University, Tehran, Iran
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14
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Taheri F, Nazarian S, Ahmadi TS, Gargari SLM. Protective effects of egg yolk immunoglobulins (IgYs) developed against recombinant immunogens CtxB, OmpW and TcpA on infant mice infected with Vibrio cholerae. Int Immunopharmacol 2020; 89:107054. [DOI: 10.1016/j.intimp.2020.107054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/25/2020] [Accepted: 09/25/2020] [Indexed: 12/11/2022]
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15
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Bakherad H, Setayesh N, Mousavi Gargari SL, Ebrahimizadeh W, Mavandadnejad F, Faghfuri E, Ebrahimi S, Heiat M, Shahpari M, Sepehrizadeh Z. Expression of recombinant G-CSF receptor domains and their inhibitory role on G-CSF function. Res Pharm Sci 2020; 15:381-389. [PMID: 33312216 PMCID: PMC7714017 DOI: 10.4103/1735-5362.293516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 03/28/2020] [Accepted: 08/18/2020] [Indexed: 12/02/2022] Open
Abstract
Background and purpose: Granulocyte colony-stimulating factor (G-CSF) is routinely used in combination with chemotherapy to battle neutropenia. However, studies suggest that this chemokine may increase the risk of metastasis and malignancy in many cancers. To counteract the adverse effects of G-CSF in cancer, antibodies have been used to block its action. However, antibodies are large and complex molecules which makes their production expensive. Thus in this study, we aim to construct different structure variants of the G-CSF receptor containing different domains and select the best variant that prevents the adverse actions of this chemokine. These novel structures are smaller than antibodies and easier to produce. Experimental approach: Different domains of the G-CSF receptor were designed and cloned into the pET28a expression vector. These recombinant receptor subunits were then expressed in Escherichia coli and purified using standard affinity chromatography techniques. Interaction of recombinant receptor subunits with G-CSF was assessed using enzyme-linked immunosorbent assay and NFS60 cells. Findings / Results: Two recombinant receptor subunits containing D1 + D2 + D3 domains and D2 domain showed the strongest inhibitory activity to G-CSF. Conclusion and implications: These novel recombinant receptor variants could be candidates for further studies in the development of novel therapeutics.
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Affiliation(s)
- Hamid Bakherad
- Department of Pharmaceutical Biotechnology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
| | - Neda Setayesh
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. Iran
| | | | - Walead Ebrahimizadeh
- Department of Surgery, Division of Urology, McGill University and the Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
| | - Faranak Mavandadnejad
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. Iran
| | - Elnaz Faghfuri
- Digestive Disease Research Center, Ardabil University of Medical Sciences, Ardabil, I.R. Iran
| | - Soheila Ebrahimi
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. Iran
| | - Mohammad Heiat
- Baqiyatallah Research Center for Gastroenterology and Liver Diseases, Baqiyatallah University of Medical Sciences, Tehran, I.R. Iran
| | - Mona Shahpari
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. Iran
| | - Zargham Sepehrizadeh
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, I.R. Iran
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16
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Esmailnia E, Amani J, Gargari SLM. Identification of novel vaccine candidate against Salmonella enterica serovar Typhi by reverse vaccinology method and evaluation of its immunization. Genomics 2020; 112:3374-3381. [PMID: 32565239 DOI: 10.1016/j.ygeno.2020.06.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 05/14/2020] [Accepted: 06/10/2020] [Indexed: 11/17/2022]
Abstract
Salmonella enterica serovar Typhi (S. Typhi) is an essential enteric fever causing bacterium worldwide. Due to the emergence of multidrug-resistant strains, urgently attention is needed to prevent the global spread of them. Vaccination is an alternative approach to control these kinds of infections. Currently available commercial vaccines have significant limitations such as non-recommendation for children below six years of age and poor long-term efficacy. Thus, the development of a new vaccine overcoming these limitations is immediately required. Reverse Vaccinology (RV) is one of the most robust approaches for direct screening of genome sequence assemblies to identify new protein-based vaccines. The present study aimed to identify potential vaccine candidates against S. Typhi by using the RV approach. Immunogenicity of the best candidate against S. Typhi was further investigated. The proteome of S. Typhi strain Ty2 was analyzed to identify the most immunogenic, conserved, and protective surface proteins. Among the predicted vaccine candidates, steD (fimbrial subunit) was the best for qualifying all the applied criteria. The synthetic steD gene was expressed in E.coli, and the mice were immunized with purified recombinant steD protein and then challenged with a lethal dose of S. Typhi. Immunized animals generated high protein-specific antibody titers and demonstrated 70% survival following lethal dose challenge with S. Typhi. Pretreatment of the S. Typhi cells with immunized mice antisera significantly decreased their adhesion to Caco-2 cells. Altogether, steD as a protective antigen could induce a robust and long term and protective immunity in immunized mice against S. Typhi challenge.
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Affiliation(s)
- Ehsan Esmailnia
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | - Jafar Amani
- Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
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17
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Fakoor MH, Mousavi Gargari SL, Owlia P, Sabokbar A. Protective Efficacy of the OprF/OprI/PcrV Recombinant Chimeric Protein Against Pseudomonas aeruginosa in the Burned BALB/c Mouse Model. Infect Drug Resist 2020; 13:1651-1661. [PMID: 32606816 PMCID: PMC7294051 DOI: 10.2147/idr.s244081] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 05/11/2020] [Indexed: 12/16/2022] Open
Abstract
Background Pseudomonas aeruginosa infection is the major cause of death in burn patients. Thus, in this study, a chimeric vaccine harboring the OprF185–350–OprI22–83–PcrV was designed and expressed in Escherichia coli. The immunogenicity of the recombinant chimer, OprI, OprF, and PcrV was studied in a burned mouse model. Methodology Recombinant proteins including the proposed chimer, OprF, OprI, and PcrV were expressed in the E.coli. Mice were immunized with the purified recombinant proteins, and the antibody titre was estimated in the sera obtained from immunized mice. Immunized and control mice were challenged with 2, 5, and 10xLD50 of the P. aeruginosa strains (PAO1, PAK, and R5), and microbial counts were measured in the skin, liver, spleen, and kidney of the studied mice. Results Results showed that the antibody titre (total IgG) was significantly increased by injection of 10 μg of chimeric protein in the experimental groups compared to the control groups. The antibody survival titre was high until 235 days after administration of the second booster. The survival rate of the mice infected with 10xLD50 was significantly increased and the number of bacteria was reduced, especially in the internal organs (kidney, spleen, and liver) compared to the mice immunized with any of the OprF, OprI, and PcrV proteins alone. Conclusion The findings of our study revealed that the chimeric protein is a promising vaccine candidate for control of the P. aeruginosa infection.
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Affiliation(s)
| | | | - Parviz Owlia
- Molecular Microbiology Research Center, Shahed University, Tehran, Iran
| | - Azar Sabokbar
- Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran
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18
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Aghamollaei H, Ghanei M, Rasaee MJ, Latifi AM, Bakherad H, Fasihi-Ramandi M, Taheri RA, Gargari SLM. Isolation and characterization of a novel nanobody for detection of GRP78 expressing cancer cells. Biotechnol Appl Biochem 2020; 68:239-246. [PMID: 32270531 DOI: 10.1002/bab.1916] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 03/25/2020] [Indexed: 11/07/2022]
Abstract
Glucose-regulated protein 78 (GRP78) is an endoplasmic reticulum (ER) chaperone that has been shown that is overexpressed in cancer cells. Overexpression of GRP78 on cancer cells makes this molecule a suitable candidate for cancer detection and targeted therapy. VHH is the binding fragment of camelid heavy-chain antibodies also known as "nanobody." The aim of this study is to isolate and produce a new recombinant nanobody using phage display technique to detect cancer cells. Using the c-terminal domain of GRP78 (CGRP) as an antigen, four rounds of biopanning were performed, and high-affinity binders were selected by ELISA. Their affinity and functionality were characterized by surface plasmon resonance (SPR) cell ELISA and immunocytochemistry. A unique nanobody named V80 was purified. ELISA and SPR showed that this antibody had high specificity and affinity to the GRP78. Immunofluorescence analysis showed that V80 could specifically bind to the HepG2 and A549 cancer cell lines. This novel recombinant nanobody could bind to the cell surface of different cancer cells. After further evaluation, this nanobody can be used as a new tool for cancer detection and tumor therapy.
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Affiliation(s)
- Hossein Aghamollaei
- Chemical Injuries Research Center, Systems biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mostafa Ghanei
- Chemical Injuries Research Center, Systems biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mohammad Javad Rasaee
- Department of Medical Biotechnology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Ali Mohammad Latifi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hamid Bakherad
- Department of Pharmaceutical Biotechnology and Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Islamic Republic of Iran
| | - Mahdi Fasihi-Ramandi
- Molecular Biology Research Center, Baqiyatallah University of Medical Science, Tehran, Iran
| | - Ramezan Ali Taheri
- Nanobiotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
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19
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Jalali T, Salehi-Vaziri M, Pouriayevali MH, Mousavi Gargari SL. Evaluation of Crimean-Congo Hemorrhagic Fever Orthonairovirus AviTagged Nucleoprotein for Potential Application in Diagnosis. Iran Biomed J 2019; 23:379-87. [PMID: 31104398 PMCID: PMC6800536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 11/24/2018] [Accepted: 12/05/2018] [Indexed: 10/15/2023]
Abstract
Background Crimean-Congo hemorrhagic fever (CCHF) is an acute viral zoonotic disease, with a mortality rate of 30-50%. There is no approved vaccine or any specific antiviral treatment for CCHF; therefore, the rapid diagnosis seems to be crucial for both efficient supportive therapy and control of infection spread. In this study, the potency of recombinant nucleoprotein of virus expressed in prokaryotic system was investigated for diagnosis of the infection. Methods The DNA sequence of complete nucleoprotein ORF was codon optimized based on E. coli codon usage and synthesized commercially. The gene was subcloned in pCA4 vector and expressed in E. coli BL21 (DE3). Refolding and simultaneous purification of nucleoprotein were performed using protein folding liquid chromatography method. The recombinant nucleoprotein was analyzed by Western blotting, ELISA, immunofluorescence assay, and circular dichroism. Forty eight human samples, in three IgM positive and three negative control groups, were evaluated using recombinant nucleoprotein in a capture ELISA setting. Serum from healthy individuals, those suspected to viral hemorrhagic fevers, and positive samples of Chikungunya and Dengue were considered as negative controls. Results The existence and structure of recombinant nucleoprotein were verified and confirmed. Capture IgM ELISA detected all positive samples (sensitivity of 100%), but none of the 25 negative samples was detected as positive (specificity of 100%). The test also detected all the included genotypes of virus. Discussion Our recombinant nucleoprotein can be used in IgM capture ELISA for easy and efficient detection of CCHF in any lab in endemic regions.
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Affiliation(s)
- Tahmineh Jalali
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
| | - Mostafa Salehi-Vaziri
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
- Reaserch Center for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Hassan Pouriayevali
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
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20
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Jalali T, Salehi-Vaziri M, Pouriayevali MH, Mousavi Gargari SL. Evaluation of Crimean-Congo Hemorrhagic Fever Orthonairovirus AviTagged Nucleoprotein for Potential Application in Diagnosis. ibj 2019. [PMID: 31104398 PMCID: PMC6800536 DOI: 10.29252/ibj.23.6.379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Background: Crimean-Congo hemorrhagic fever (CCHF) is an acute viral zoonotic disease, with a mortality rate of 30-50%. There is no approved vaccine or any specific antiviral treatment for CCHF; therefore, the rapid diagnosis seems to be crucial for both efficient supportive therapy and control of infection spread. In this study, the potency of recombinant nucleoprotein of virus expressed in prokaryotic system was investigated for diagnosis of the infection. Methods: The DNA sequence of complete nucleoprotein ORF was codon optimized based on E. coli codon usage and synthesized commercially. The gene was subcloned in pCA4 vector and expressed in E. coli BL21 (DE3). Refolding and simultaneous purification of nucleoprotein were performed using protein folding liquid chromatography method. The recombinant nucleoprotein was analyzed by Western blotting, ELISA, immunofluorescence assay, and circular dichroism. Forty eight human samples, in three IgM positive and three negative control groups, were evaluated using recombinant nucleoprotein in a capture ELISA setting. Serum from healthy individuals, those suspected to viral hemorrhagic fevers, and positive samples of Chikungunya and Dengue were considered as negative controls. Results: The existence and structure of recombinant nucleoprotein were verified and confirmed. Capture IgM ELISA detected all positive samples (sensitivity of 100%), but none of the 25 negative samples was detected as positive (specificity of 100%). The test also detected all the included genotypes of virus. Conclusion: Our recombinant nucleoprotein can be used in IgM capture ELISA for easy and efficient detection of CCHF in any lab in endemic regions.
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Affiliation(s)
- Tahmineh Jalali
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
| | - Mostafa Salehi-Vaziri
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
- Reaserch Center for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Hassan Pouriayevali
- Department of Arboviruses and Viral Hemorrhagic Fevers (National Reference Laboratory), Pasteur Institute of Iran, Tehran, Iran
| | - Seyed Latif Mousavi Gargari
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
- Corresponding Author: Seyed Latif Mousavi Gargari , Department of Biology, Shahed University, Khalije Fars Highway, Tehran 3319118651, Iran; Tel.: (+98-21) 51212232; E-mail:
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21
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Aghajani Z, Rasooli I, Mousavi Gargari SL. Exploitation of two siderophore receptors, BauA and BfnH, for protection against Acinetobacter baumannii infection. APMIS 2019; 127:753-763. [PMID: 31512768 DOI: 10.1111/apm.12992] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Accepted: 08/19/2019] [Indexed: 01/30/2023]
Abstract
Iron uptake system is expressed in early stages of Acinetobacter baumannii infections under iron-restricted conditions. This study is aimed at the evaluation of immuno-protectivity of BfnH in comparison with BauA in both mature and selected fragmental proteins. The study was designed in single and combined forms of antigens. BfnH is presented in 3472 strains of A. baumannii with more than 97% identity. The preliminary immune-informatics analysis of this protein indicated a region from the β-barrel domain including exposed loops 2-5, with antigenic score comparable to that of BfnH. There was a significant rise in the specific IgG response in all test groups. The bacterial challenge with a lethal dose of A. baumannii demonstrated partial protection of whole proteins which coincides with a significant reduction in the bacterial population colonized in the main organs and an increase in the survival level. Passive immunization of the mice brought about 50% survival in the mice groups immunized with BfnH and with a combination of BfnH and BauA. The protectivity of siderophore receptors suggests their potential immunogenic role that could be considered as a component of multivalent subunit vaccine candidates against A. baumannii.
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Affiliation(s)
| | - Iraj Rasooli
- Department of Biology, Shahed University, Tehran, Iran.,Molecular Microbiology Research Center, Shahed University, Tehran, Iran
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22
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Ranjbar M, Behrouz B, Norouzi F, Mousavi Gargari SL. Anti-PcrV IgY antibodies protect against Pseudomonas aeruginosa infection in both acute pneumonia and burn wound models. Mol Immunol 2019; 116:98-105. [PMID: 31634816 DOI: 10.1016/j.molimm.2019.10.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 10/04/2019] [Accepted: 10/07/2019] [Indexed: 12/11/2022]
Abstract
Pseudomonas aeruginosa is a common nosocomial pathogen in burn patients, and rapidly acquires antibiotic resistance; thus, developing an effective therapeutic approach is the most promising strategy for combating infection. Type III secretion system (T3SS) translocates bacterial toxins into the cytosol of the targeted eukaryotic cells, which plays important roles in the virulence of P. aeruginosa infections in both acute pneumonia and burn wound models. The PcrV protein, a T3SS translocating protein, is required for T3SS function and is a well-validated target in animal models of immunoprophylactic strategies targeting P. aeruginosa. In the present study, we evaluated the protective efficacy of chicken egg yolk antibodies (IgY) raised against recombinant PcrV (r-PcrV) in both acute pneumonia and burn wound models. R-PcrV protein was generated by expressing the pcrV gene (cloned in pET-28a vector) in E. coli BL-21. Anti-PcrV IgY was obtained by immunization of hen. Anti-PcrV IgY induced greater protection in P. aeruginosamurine acute pneumonia and burn wound models than control IgY (C-IgY) and PBS groups. Anti-PcrV IgY improved opsonophagocytic killing and inhibition of bacterial invasion of host cells. Taken together, our data provide evidence that anti-PcrV IgY can be a promising therapeutic candidate for combating P. aeruginosa infections.
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Affiliation(s)
- Mahya Ranjbar
- Department of Microbiology, Shahed University, Faculty of Medical Sciences, Tehran, Iran; Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
| | - Bahador Behrouz
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
| | - Fatemeh Norouzi
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
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23
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Kavousipour S, Mokarram P, Gargari SLM, Mostafavi-Pour Z, Barazesh M, Ramezani A, Ashktorab H, Mohammadi S, Ghavami S. A Comparison Between Cell, Protein and Peptide-Based Approaches for Selection of Nanobodies Against CD44 from a Synthetic Library. Protein Pept Lett 2019; 25:580-588. [PMID: 29848261 DOI: 10.2174/0929866525666180530122159] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 05/10/2018] [Accepted: 05/11/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND The hyaluronic acid receptor CD44, is a cancer stem cell biomarker, playing important roles in cell adhesion, tumor progression and drug-resistance. Therefore, CD44 is a potential target for cancer treatment and its blockade could result in multi-factorial therapeutic effects. METHODS Nanobodies against CD44 were isolated from a synthetic library with a diversity of 5×1011 CFU/ml using the phage display technique. Three approaches were used for isolation of nanobodies fragments including peptide-, protein- and cell-based panning. RESULTS Nanobodies from cell-based panning displayed more specificity compared to protein or peptide-based panning. Our results show that cell-based panning is the most efficient method for isolation of a specific single domain antibody fragment to CD44 from a synthetic phage displayed library. CONCLUSION The isolated nanobodies could successfully recognize and bind cells that express the CD44 surface antigen.
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Affiliation(s)
- Soudabeh Kavousipour
- Department of Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Pooneh Mokarram
- Department of Biochemistry, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.,Colorectal Cancer Research Center, Nemazi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
| | | | - Zohreh Mostafavi-Pour
- Department of Biochemistry, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mehdi Barazesh
- Department of Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Amin Ramezani
- Department of Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.,Shiraz Institute for Cancer Research, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hassan Ashktorab
- Department of Medicine and Cancer Center, Howard University College of Medicine, Washington, DC, United States
| | - Shiva Mohammadi
- Department of Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB, Canada
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Nazari M, Gargari SLM, Sahebghadam Lotfi A, Rassaee MJ, Taheri RA. Aptamer-Based Sandwich Assay for Measurement of Thymidine Kinase 1 in Serum of Cancerous Patients. Biochemistry 2019; 58:2373-2383. [PMID: 30900869 DOI: 10.1021/acs.biochem.8b01284] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Thymidine kinase 1 (TK1) is traditionally a serum biomarker that is elevated in the early stages of malignancies. The diagnostic and prognostic role of TK1 for screening and monitoring human malignancies has recently been investigated. Anti-human TK1 aptamers were selected through 12 iterative rounds of systematic evolution of ligands by exponential enrichment from a DNA library. The aptamer pool of round 12 was amplified, and the polymerase chain reaction product was cloned on the TA vector. Of the 85 colonies obtained, 52 were identified as positive clones. These aptamers were screened for TK1 with surface plasmon resonance, where apta37 and apta69 showed the highest affinity for TK1. The TK1_apta37 and TK1_apta69 aptamers were used in a sandwich assay platform and successfully detected TK1 in the concentration range of 54-3500 pg mL-1. Clinical samples from 60 cancerous patients were also tested with this assay system and compared using the conventional antibody-based enzyme-linked immunosorbent assay kit. The aptamer sandwich assay demonstrated a dynamic range for TK1 at clinically relevant serum levels, covering subpicogram per milliliter concentrations. The new approach offers a simple and robust method for detecting serum biomarkers that have low and moderate abundance. The results of this study demonstrate the screening capability of the aptamer sandwich assay platform and its potential applicability to the point-of-care testing system.
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Affiliation(s)
- Mahmood Nazari
- Department of Clinical Biochemistry, Faculty of Medicine , Tarbiat Modares University , Tehran , Iran
| | | | - Abbas Sahebghadam Lotfi
- Department of Clinical Biochemistry, Faculty of Medicine , Tarbiat Modares University , Tehran , Iran
| | - Mohammad Javad Rassaee
- Department of Clinical Biochemistry, Faculty of Medicine , Tarbiat Modares University , Tehran , Iran
| | - Ramezan Ali Taheri
- Nanobiotechnology Research Center , Baqiyatallah University of Medical Sciences , Tehran , Iran
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25
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Vakili A, Mousavi Gargari SL, Nazarian S, Amani J. Designing and Expression of Recombinant Chimeric Protein Containing CtxB and OmpW from Vibrio Cholerae and Evaluation of Its Immunogenicity. Iran J Immunol 2018; 15:207-220. [PMID: 30246696 DOI: 10.22034/iji.2018.39390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
BACKGROUND Cholera disease caused by Vibrio cholerae remains a major cause of morbidity and mortality throughout the world. Various strategies with different proteins as immunogens have been tried for vaccine development, none of which have been sufficiently effective to preclude cholera. Chimeric proteins, with their ability to present multiple antigens at the same time, can play important roles in immunization. OBJECTIVE To evaluate the immunogenicity of a chimeric construct, comprised of OmpW and CtxB as immunogenic proteins of Vibrio cholera, in BALB/c mice. METHODS The construct was designed after bioinformatics assessments and then expressed in E.coli. Chimeric protein, OmpW, and CtxB were purified with Ni-NTA chromatography and confirmed by Western blotting. Mice were immunized with purified recombinant proteins. The antibody titers and specificity of the immune sera were then analyzed by ELISA and challenged on the pups of immunized mice with 1, 5 and 10 LD50. Mice ileal loop assay was also performed. RESULTS Significant differences were observed in antibody titers in immunized mice compared to the control groups. Infant mouse challenge was performed so as to compare the protective efficacies of the selected immunogen regimens. Of the Pups from dams immunized with chimeric protein which received 1 LD50, 75% survived. Pups belonging to PBS-immunized dams, experienced 100% mortality. The serum raised toward immunogenic construct, inhibited cholera toxin activity in ileal loop test up to 68%. CONCLUSION Chimeric construct is able to induce the immune system and provide up to 75% inhibition of toxin activity against 1 LD50 of Vibrio cholerae.
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Affiliation(s)
- Atina Vakili
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
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Abdollahi S, Rasooli I, Mousavi Gargari SL. The role of TonB-dependent copper receptor in virulence of Acinetobacter baumannii. Infect Genet Evol 2018; 60:181-190. [PMID: 29505819 DOI: 10.1016/j.meegid.2018.03.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 02/11/2018] [Accepted: 03/01/2018] [Indexed: 12/15/2022]
Abstract
Acinetobacter baumannii is an opportunistic gram negative pathogen that can adhere to different surfaces and cause different nosocomial infections. To investigate the role of TonB-dependent copper receptor, an outer membrane protein, in virulence of A. baumannii, we deleted this receptor from A. baumannii chromosome. There was a significant decrease in biofilm formation by copper receptor deficient mutant strain. Similarly, the adherence to human epithelial cell and the hydrophobicity were declined. The survival rate of the mutant strain in human sera was reduced while no change was observed in motility of strains. In murine pneumonia model, the bacterial lethal dose 0 (LD0), LD50 and LD100 were increased for mutant strain. Moreover, in vivo and in vitro experiments revealed changes in growth rate and dissemination of mutant strain; so that the bacterial load of the mutant was significantly reduced in the spleen and lung. The findings suggest a critical role for TonB-dependent copper receptor in virulence of A. baumannii.
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Affiliation(s)
| | - Iraj Rasooli
- Department of Biology, Shahed University, Tehran, Iran; Molecular Microbiology Research Center, Shahed University, Tehran, Iran.
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Adriani R, Mousavi Gargari SL, Nazarian S, Sarvary S, Noroozi N. Immunogenicity of Vibrio cholerae outer membrane vesicles secreted at various environmental conditions. Vaccine 2018; 36:322-330. [DOI: 10.1016/j.vaccine.2017.09.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 08/28/2017] [Accepted: 09/03/2017] [Indexed: 11/26/2022]
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Mirzakhani K, Gargari SLM, Rasooli I, Rasoulinejad S. Development of a DNA Aptamer for Screening Neisseria meningitidis Serogroup B by Cell SELEX. Iran Biomed J 2017; 22:193-201. [PMID: 28941453 PMCID: PMC5889504 DOI: 10.22034/ibj.22.3.193] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 07/26/2017] [Accepted: 07/30/2017] [Indexed: 02/07/2023]
Abstract
Background Artificial oligonucleotides like DNA or RNA aptamers can be used as biodiagnostic alternatives for antibodies to detect pathogens. Comparing to antibodies, artificial oligonucleotides are produced easily at lower costs and are more stable. Neisseria meningitidis, the causative agent of meningitis, is responsible for about 1% of infections in an epidemic period. Specific DNA aptamers that bind to N. meningitidis serogroup B were identified by whole-cell Systemic Evolution of Ligands by EXponential Enrichment (SELEX). Methods The SELEX begins with a library of labeled ssDNA molecules. After six rounds of selection and two rounds of counter-selection, 60 clones were obtained, of which the binding efficiency of 21 aptamers to the aforementioned bacterium was tested by flow cytometry. Results The aptamers K3 and K4 showed the highest affinity to N. meningitidis serogroup B and no affinity to N. meningitidis serogroups Y, A, and C, or to other meningitis causing bacteria. The dissociation constant (Kd value) for K3 and K4 were calculated as 28.3±8.9 pM and 39.1±8.6 pM, respectively. K3 aptamer with the lowest Kd was chosen as the main aptamer. K3 could detect N. meningitidis in patients’ cerebrospinal fluid (CSF) samples and in CSF from healthy volunteers inoculated with N. meningitidis serogroup B (ATCC 13090) at 200 and 100 CFU ml-1, respectively. Conclusion The findings suggest the application of the developed aptamer in specific detection of N. meningitidis serogroup B amongst a group of meningitis causing bacteria.
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Affiliation(s)
- Kimia Mirzakhani
- Faculty of Medicine, Institute of Human Genetics, Friedrich-Schiller University, Jena, Germany
| | | | - Iraj Rasooli
- Department of Biology, Shahed University, Tehran, Iran
- Molecular Microbiology Research Center, Shahed University, Tehran, Iran
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Bakherad H, Gargari SLM, Sepehrizadeh Z, Aghamollaei H, Taheri RA, Torshabi M, Yazdi MT, Ebrahimizadeh W, Setayesh N. Identification and in vitro characterization of novel nanobodies against human granulocyte colony-stimulating factor receptor to provide inhibition of G-CSF function. Biomed Pharmacother 2017. [PMID: 28646705 DOI: 10.1016/j.biopha.2017.06.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Hamid Bakherad
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Zargham Sepehrizadeh
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Hossein Aghamollaei
- Young Researchers and Elites Club, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Ramezan Ali Taheri
- Department of Nano Biotechnology, Research Center for New Technologies in Life Science Engineering, University of Tehran, Tehran, Iran
| | - Maryam Torshabi
- Department of Dental Biomaterials, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mojtaba Tabatabaei Yazdi
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Walead Ebrahimizadeh
- Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Neda Setayesh
- Department of Pharmaceutical Biotechnology and Pharmaceutical Biotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
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Rashidi SK, Mousavi Gargari SL, Ebrahimizadeh W. Targeting Colorectal Cancer Cell Lines Using Nanobodies; AgSK1as a Potential Target. Iran J Biotechnol 2017; 15:78-86. [PMID: 29845054 DOI: 10.15171/ijb.1472] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 09/04/2016] [Accepted: 06/19/2017] [Indexed: 01/08/2023]
Abstract
Background: Colorectal cancer is the third most common type of aggressive cancers. Chemotherapy, surgery, and radiotherapy are the common therapeutic options for treating this cancer. Due to the adverse side-effects of these methods, immunotherapy is considered as an appropriate alternative therapeutic option. Treatment through the application of monoclonal antibodies is considered as a novel alternative therapeutic method for cancers. The variable fragments of the antibodies' heavy chain or VHHs have a wide application in molecular biology and biotechnology. VHHs are compatible with the phage display technology which allows rapid and high throughput screening for antibodies isolation. Objectives: We aimed to use naive VHH phage library to isolate a specific nanobody against colorectal tumor associated antigen; the AgSK1. Materials and Methods: In this research, naive VHH phage library was panned against two colorectal cell lines; Ls174T and HT29 expressing different levels of AgSK1 tumor associated marker. The high affinity binders were selected and subcloned for higher expression levels of the VHH. The affinity and specificity of the isolated VHH were tested using ELISA. The reactivity of the VHH toward cancer cells was analyzed by competitive ELISA applying sera isolated from colorectal cancer patients. Results: Results show that the isolated VHH recognizes and binds to the colorectal cancer cells with a high affinity. Moreover, the isolated nanobody is able to compete with the antibodies in the patient sera for the binding to the cancer cells. Conclusions: Results suggest that this nanobody has a specific reaction toward colorectal cells and can be used for further investigation on the tumor associated antigens or production of mimotopes useful for immunotherapy.
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Affiliation(s)
- Seyed Khalil Rashidi
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
| | | | - Walead Ebrahimizadeh
- Department of Biology, Faculty of Basic Science, Shahed University, Tehran, Iran
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Ghazi FMP, Gargari SLM. Synthetic peptides mimicking lipopolysaccharide as a potential vaccine candidates against Vibrio cholerae serogroup O1. Iran J Microbiol 2017; 9:244-250. [PMID: 29238460 PMCID: PMC5723977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVES Cholera is a life-threatening diarrhea caused mainly by Gram-negative marine habitant Vibrio cholerae serogroup O1. Cholera vaccination is limited mainly to developed countries, due to the cumbersome and expensive task of vaccine production. In the present work, the aim was to study the immunogenicity of the synthetic mimotopes through two different routes of injection and oral administration. Lipopolysaccharide (LPS) is one of the immunogenic components in Gram-negative bacteria, which cannot be used as a vaccine candidate, due to its high toxic effect. MATERIALS AND METHODS Three phage-displayed selected peptides, with high affinity to anti-LPS VHH tested in our previous study, were chemically synthesized and used as a potential vaccine candidate. In order to enhance the antigenic properties and safe delivery, these peptides were conjugated to BSA as a carrier and encapsulated with PLGA. Peptides were injected intra-peritoneally or administered orally, alone or in combined form. Mice sera and feces were collected for assessment of humoral and mucosal antibody titers, respectively. ELISA plates were coated with mimotope conjugates and V. cholerae, Shigella sonnei and ETEC were used as target antigens. Antibody titer was measured by adding IgG and IgA as primary antibodies. RESULTS Mice receiving three selected synthetic peptide conjugates (individually or in combination) showed higher antibody titer compared to control groups. The mice immunized with synthetic peptides were protected against more than 15 LD50 of V. cholerae. CONCLUSION These peptides are mimicking LPS and can potentially act as vaccine candidates against V. cholerae.
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Affiliation(s)
| | - Seyed Latif Mousavi Gargari
- Corresponding author: Seyed Latif Mousavi Gargari, Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran., Tel: +98 -21-51212200, Fax: +98-21-51212201,
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Pourasadi S, Mousavi Gargari SL, Rajabibazl M, Nazarian S. Efficient production of nanobodies against urease activity ofHelicobacter pylori in Pichia pastoris. Turk J Med Sci 2017; 47:695-701. [PMID: 28425268 DOI: 10.3906/sag-1509-121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 08/31/2016] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND/AIM Helicobacter pylori is a major health problem. One of the therapeutic approaches is administration of antibody against H. pylori. The methylotrophic Pichia pastoris is a suitable host for expression of recombinant antibody fragments. The aims of this study were the expression and the evaluation of camelid nanobody in the yeast Pichia pastoris. MATERIALS AND METHODS The camelid-derived heavy-chain antibody (nanobody) against the UreC subunit of urease from H. pylori was subcloned in the pPink-HC shuttle vector and transferred into Escherichia coli TOP10. After digestion and purification, the shuttle vector was transformed in the PichiaPink expression system. The expression was evaluated in an in vitro system. RESULTS The yield of the nanobody expressed in P. pastoris was estimated to be 5 mg/L as compared to 2 mg/L expressed by E. coli. The nanobody was purified and binding affinity to the UreC antigen was evaluated using ELISA. Neutralization abilities of the two nanobodies expressed in yeast and E. coli were compared. The yeast-expressed nanobody specifically detected recombinant UreC and inhibited urease activity with high efficiency. CONCLUSION The results suggest attribution of the enhanced quality and quantity of the nanobody produced in P. pastoris to better posttranslational modification and folding in the yeast cell.
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Affiliation(s)
- Shahrbanoo Pourasadi
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | | | - Masoumeh Rajabibazl
- Department of Clinical Biochemistry, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shahram Nazarian
- Department of Biological Sciences, Faculty of Science, Imam Hossein University, Tehran, Iran
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Darwish Alipour Astaneh S, Rasooli I, Mousavi Gargari SL. Filamentous hemagglutinin adhesin FhaB limits A.baumannii biofilm formation. Front Biosci (Elite Ed) 2017; 9:266-275. [PMID: 28199190 DOI: 10.2741/e801] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Increased resistance and survival, as well as immune evasion, play a significant role in the pathogenicity of Acinetobacter baumannii. Here, we report on the adhesion of the bacterium to epithelial cells and formation of biofilm on abiotic surfaces. We identificed autotransporter (AT) genes that encode homologues (Fha-like) of the two-partner secretion system (TPS) in A.baumannii (ATCC19606) which we designate as FhaB (exoprotein) and FhaC (transporter) and demonstrate that these novel genes, are under the control of distinct regulatable promoters within either the same (FhaBC) or two distinct (FhaB and FhaC) cells. The expression of this gene in outer membrane protein (OM) showed them to be deficient in the adherence to A546 cells. FhaB is involved in hydrophobicity of A. baumannii ATCC19606 while FhaBC is associated with biofilm formation. The vaccinogenic potential of FHA-like proteins offers use of these targets as novel therapeutic strategies to limit A.baumannii associated morbidity and mortality.
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Affiliation(s)
| | - Iraj Rasooli
- Department of Biology, Shahed University, Opposite Imam Khomeini's Shrine, Tehran-Qom Express Way, Tehran, Iran,
| | - Seyed Latif Mousavi Gargari
- Department of Biology, Shahed University, Opposite Imam Khomeini's Shrine, Tehran-Qom Express Way, Tehran, Iran, 3Molecular Microbiology Research Center, Shahed University, Tehran, Iran
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Mohammad Pour Ghazi F, Gargari SLM. Development of lipopolysaccharide-mimicking peptides and their immunoprotectivity againstVibrio choleraeserogroup O1. J Pept Sci 2016; 22:682-688. [DOI: 10.1002/psc.2930] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/14/2016] [Accepted: 09/15/2016] [Indexed: 11/06/2022]
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Alfavian H, Mousavi Gargari SL, Rasoulinejad S, Medhat A. Development of a DNA aptamer that binds specifically to group A Streptococcus serotype M3. Can J Microbiol 2016; 63:160-168. [PMID: 28121169 DOI: 10.1139/cjm-2016-0495] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Group A streptococcus (GAS) is an important Gram-positive pathogen that causes various human diseases ranging from peripheral lesions to invasive infections. The M protein is one of the main virulence factors present on the cell surface and is associated with invasive GAS infections. Compared with other M types, serotype M3 has a predominant role in lethal infections and demonstrates epidemic behaviors, including streptococcal toxic shock syndrome, bacteremia, and necrotizing fasciitis. Traditional methods for M typing are time-consuming, tedious, contradictory, and generally restricted to reference laboratories. Therefore, development of a new M-typing technique is needed. Aptamers with the ability to detect their target with a high degree of accuracy and specificity can be ideal candidates for specific M-typing of Streptococcus pyogenes. In this study DNA aptamers with a high binding affinity towards S. pyogenes serotype M3 were selected through 12 iterative rounds of the Systematic Evolution of Ligands by EXponential (SELEX) enrichment procedure using live cells as a target. We monitored the progress of the SELEX procedure by flow cytometry analysis. Of several aptamer sequences analyzed, 12L18A showed the highest binding efficiency towards S. pyogenes type M3, with an apparent dissociation constant (Kd) of 7.47 ± 1.72 pmol/L being the lowest. Therefore the isolated aptamer can be used in any tool, such as a biosensor, for the detection of S. pyogenes and can be used in the development of a novel M-typing system.
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Affiliation(s)
- Hanif Alfavian
- a Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | | | - Samaneh Rasoulinejad
- a Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran
| | - Arvin Medhat
- b GENEXIR Biopharma, a knowledge-based company at Pasteur Institute of Iran Health Technology Park, Tehran, Iran
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Rasoulinejad S, Gargari SLM. Aptamer-nanobody based ELASA for specific detection of Acinetobacter baumannii isolates. J Biotechnol 2016; 231:46-54. [PMID: 27234880 DOI: 10.1016/j.jbiotec.2016.05.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/12/2016] [Accepted: 05/19/2016] [Indexed: 11/26/2022]
Abstract
Acinetobacter baumannii has turned into an important threat in nosocomial outbreak infections and multidrug resistance leading to high mortality rates in the 21st century. In recent years its mortality has increased by 15% which in part could be due to lack of a rapid and sensitive diagnostic test. In this work we introduced a new detection test for A. baumannii with two highly specific aptamer and nanobody molecules. High binding affinity DNA oligonucleotide aptamers toward A. baumannii were selected through 12 rounds of whole cell System Evolution of Ligands by EXponential enrichment process (SELEX). The SELEX procedures was monitored by flow cytometry. The dissociation constant and binding efficiency of the selected aptamer Aci49 was 7.547±1:353pM and 47.50%, respectively. A sandwich enzyme linked aptamer sorbent assay (ELASA) was designed with the biotinylated Aci49 aptamer and our previously developed nanobody against biofilm associated protein (Bap). The assay system was optimized with A. baumannii (ATCC 19606) and 47 clinical isolates of A. baumannii were tested. The threshold of detection in sandwich ELASA process was10(3) CFU/ml. The sensitivity of test toward the clinical isolates was 95.47%. Our results reveal that the sandwich ELASA is sensitive and specific enough for the rapid detection of A. baumannii from clinical isolates.
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Baghban R, Gargari SLM, Rajabibazl M, Nazarian S, Bakherad H. Camelid-derived heavy-chain nanobody againstClostridium botulinumneurotoxin E inPichia pastoris. Biotechnol Appl Biochem 2016; 63:200-5. [PMID: 24673401 DOI: 10.1002/bab.1226] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 03/20/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Roghayyeh Baghban
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Express Way, Tehran, Iran
| | | | - Masoumeh Rajabibazl
- Department of Clinical Biochemistry, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shahram Nazarian
- Department of Biological Sciences, Faculty of Sciences, Imam Hosein University, Tehran, Iran
| | - Hamid Bakherad
- Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran-Qom Express Way, Tehran, Iran
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Aghamollaei H, Mousavi Gargari SL, Ghanei M, Rasaee MJ, Amani J, Bakherad H, Farnoosh G. Structure prediction, expression, and antigenicity of c-terminal of GRP78. Biotechnol Appl Biochem 2016; 64:117-125. [PMID: 26549515 DOI: 10.1002/bab.1455] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 10/30/2015] [Indexed: 12/17/2022]
Affiliation(s)
- Hossein Aghamollaei
- Applied Biotechnology Research Center; Baqiyatallah University of Medical Sciences; Tehran Iran
| | | | - Mostafa Ghanei
- Chemical Injuries Research Center; Baqiyatallah University of Medical Sciences; Tehran Iran
| | - Mohamad Javad Rasaee
- Medical Biotechnology Department, Faculty of Medical sciences; Tarbiat Modares University; Tehran Iran
| | - Jafar Amani
- Applied Microbiology Research Center; Baqiyatallah University of Medical Sciences; Tehran Iran
| | - Hamid Bakherad
- Department of Pharmaceutical Biotechnology, Faculty of pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Gholamreza Farnoosh
- Applied Biotechnology Research Center; Baqiyatallah University of Medical Sciences; Tehran Iran
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Almasi F, Mousavi Gargari SL, Bitaraf F, Rasoulinejad S. Development of a Single Stranded DNA Aptamer as a Molecular Probe for LNCap Cells Using Cell-SELEX. Avicenna J Med Biotechnol 2016; 8:104-11. [PMID: 27563422 PMCID: PMC4967543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
BACKGROUND Nowadays, highly specific aptamers generated by cell SELEX technology (systematic evolution of ligands by exponential enrichment) are being applied for early detection of cancer cells. Prostate Specific Membrane Antigen (PSMA), over expressed in prostate cancer, is a highly specific marker and therefore can be used for diagnosis of the prostate cancer cells. The aim of the present study was to select single-stranded DNA aptamers against LNCap cells highly expressing PSMA, using cell-SELEX method which can be used as a diagnostic tool for the detection of prostate cancer cells. METHODS After 10 rounds of cell-SELEX, DNA aptamers were isolated against PSMA using LNCaP cells as a target and PC-3 cell lines for counter SELEX. Five DNA aptamers with more than 70% affinity were selected up on flow cytometry analysis of positive clones. RESULTS Dissociation constants of two selected sequences (A12-B1) were estimated in the range of 33.78±3.77 and 57.49±2.214 pmol, respectively. Conserved secondary structures of A12 and B1 sequences suggest the necessity of these structures for binding with high affinity to native PSMA. Comparison of the secondary structures of our isolated aptamers and aptamer A10 obtained by protein SELEX showed similar stem-loop structures which could be responsible for the recognition of PSMA on LNCap cell surface. CONCLUSION Our results indicated that selected aptamers may turn out to be ideal candidates for the development of a detection tool and also can be used in targeted drug delivery for future smart drugs.
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Affiliation(s)
- Faezeh Almasi
- Department of Biotechnology, College of Science, Tehran University, Tehran, Iran
| | - Seyed Latif Mousavi Gargari
- Department of Biology, Shahed University, Tehran, Iran,Corresponding author: Seyed Latif Mousavi Gargari, Ph.D., Biology Department, Shahed University, Tehran-Qom Expressway, Tehran, Iran, Tel: +98 21 51212200, Fax: +98 21 51212201, E-mail:
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Farsani HH, Rasooli I, Gargari SLM, Nazarian S, Astaneh SDA. Recombinant outer membrane protein F-B subunit of LT protein as a prophylactic measure against Pseudomonas aeruginosa burn infection in mice. World J Methodol 2015; 5:230-237. [PMID: 26713284 PMCID: PMC4686421 DOI: 10.5662/wjm.v5.i4.230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Revised: 08/05/2015] [Accepted: 12/02/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To study immunogenicity of outer membrane protein F (OprF) fused with B subunit of LT (LTB), against Pseudomonas aeruginosa (P. aeruginosa).
METHODS: The OprF, a major surface exposed outer membrane protein that is antigenically conserved in various strains of P. aeruginosa, is a promising immunogen against P. aeruginosa. In the present study recombinant OprF and OprF-LTB fusion gene was cloned, expressed and purified. BALB/c mice and rabbits were immunized using recombinant OprF and OprF-LTB and challenged at the burn site with P. aeruginosa lethal dose of 104 CFU. The protective efficacy of rabbit anti OprF IgG against P. aeruginosa burn infection was investigated by passive immunization.
RESULTS: It has been well established that the LTB is a powerful immunomodulator with strong adjuvant activity. LTB as a bacterial adjuvant enhanced immunogenicity of OprF and anti OprF IgG titer in serum was increased. Experimental findings showed significantly higher average survival rate in burned mice immunized with OprF-LTB than immunized with OprF or the control group. Rabbits anti OprF IgG brought about 75% survival of mice following challenge with P. aeruginosa. Post challenge hepatic and splenic tissues of mice group immunized with OprF-LTB had significantly lower bacterial load than those immunized with OprF or the control groups.
CONCLUSION: These results demonstrate that LTB-fused OprF might be a potential candidate protein for a prophylactic measure against P. aeruginosa in burn infection.
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Alerasol M, Mousavi Gargari SL, Nazarian S, Bagheri S. Immunogenicity of a fusion protein comprising coli surface antigen 3 and labile B subunit of enterotoxigenic Escherichia coli. Iran Biomed J 2014; 18:212-218. [PMID: 25326019 PMCID: PMC4225060 DOI: 10.6091/ibj.1344.2014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Background: Enterotoxigenic Escherichia coli (ETEC) strains are the major causes of diarrheal disease in humans and animals. Colonization factors and enterotoxins are the major virulence factors in ETEC pathogenesis. For the broad-spectrum protection against ETEC, one could focus on colonization factors and non-toxic heat labile as a vaccine candidate. Methods: A fusion protein is composed of a major fimbrial subunit of coli surface antigen 3, and the heat-labile B subunit (LTB) was constructed as a chimeric immunogen. For optimum level expression of protein, the gene was synthesized with codon bias of E. coli. Also, recombinant protein was expressed in E. coli BL21DE3. ELISA and Western tests were carried out for determination of antigen and specificity of antibody raised against recombinant protein in animals. The anti-toxicity and anti-adherence properties of the immune sera against ETEC were also evaluated. Results: Immunological analyses showed the production of high titer of specific antibody in immunized mice. The built-in LTB retains native toxin properties which were approved by GM1 binding assay. Pre-treatment of the ETEC cells with anti-sera significantly decreased their adhesion to Caco-2 cells. Conclusion: The results indicated the efficacy of the recombinant chimeric protein as an effective immunogen inducing strong humoral response. The designated chimer would be an interesting prototype for a vaccine and worthy of further investigation.
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Payandeh Z, Rasooli I, Mousavi Gargari SL, Rajabi Bazl M, Ebrahimizadeh W. Immunoreaction of a recombinant nanobody from camelid single domain antibody fragment with Acinetobacter baumannii. Trans R Soc Trop Med Hyg 2014; 108:92-8. [PMID: 24463583 DOI: 10.1093/trstmh/trt114] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Acinetobacter baumannii, an important nosocominal pathogen, causes various human infections like meningitis, bacteremia and pneumonia. The aim of this study was to produce nanobodies derived from camel heavy chain antibodies (HcAb) against a conserved region of the biofilm associated protein (Bap) of A. baumannii, by phage display technique. METHODS A camel was immunized with the purified recombinant protein expressed from the conserved region of Bap and polyclonal antibody production was confirmed by ELISA. After RNA extraction from peripheral lymphocytes, cDNA was prepared and a phagemid library was constructed. RESULTS Phage particles encoding nanobodies were produced by infecting transformed cells with a M13K07 helper phage. A total of six panning rounds were performed to select high affinity clones. Screening of high affinity monoclonal nanobodies was performed using phage-ELISA. A clone with the highest absorption in monoclonal phage-ELISA was selected for soluble expression of the desired nanobody. CONCLUSIONS This is the first report on the expression and production of nanobodies against Bap. Increasing trends of drug resistance have shifted the focus to the role of antibodies in diagnosis and treatment of human diseases. Similarities of the produced VHH to human VH, makes the role of this nanobody promising in immunotherapy.
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Darvish Alipour Astaneh S, Rasooli I, Mousavi Gargari SL. The role of filamentous hemagglutinin adhesin in adherence and biofilm formation in Acinetobacter baumannii ATCC19606(T). Microb Pathog 2014; 74:42-9. [PMID: 25086432 DOI: 10.1016/j.micpath.2014.07.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 06/14/2014] [Accepted: 07/21/2014] [Indexed: 11/17/2022]
Abstract
Filamentous hemagglutinin adhesins (FHA) are key factors for bacterial attachment and subsequent cell accumulation on substrates. Here an FHA-like Outer membrane (OM) adhesin of Acinetobacter baumannii ATCC19606(T) was displayed on Escherichia coli. The candidate autotransporter (AT) genes were identified in A. baumannii ATCC19606(T) genome. The exoprotein (FhaB1) and transporter (FhaC1) were produced independently within the same cell (FhaB1C1). The fhaC1 was mutated. In vitro adherence to epithelial cells of the recombinant FhaB1C1 and the mutant strains were compared with A. baumanni ATCC19606(T). A bivalent chimeric protein (K) composed of immunologically important portions of fhaB1 (B) and fhaC1 (C) was constructed. The mice vaccinated with chimeric protein were challenged with A. baumannii ATCC19606(T) and FhaB1C1 producing recombinant E. coli. Mutations in the fhaC1 resulted in the absence of FhaB1 in the OM. Expression of FhaB1C1 enhanced the adherence of recombinant bacteria to A546 bronchial cell line. The results revealed association of FhaB1 with bacterial adhesion and biofilm formation. Immunization with a combination of recombinant B and K proteins proved protective against A. baumanni ATCC19606(T). The findings may be applied in active and passive immunization strategies against A. baumannii.
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Affiliation(s)
| | - Iraj Rasooli
- Department of Biology, Shahed University, Opposite Imam Khomeini's Shrine, Tehran-Qom Express Way, Tehran, Iran; Molecular Microbiology Research Center, Shahed University, Tehran, Iran.
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Bagheri S, Mousavi Gargari SL, Rasooli I, Nazarian S, Alerasol M. A CssA, CssB and LTB chimeric protein induces protection against Enterotoxigenic Escherichia coli. Braz J Infect Dis 2014; 18:308-14. [PMID: 24389278 PMCID: PMC9427529 DOI: 10.1016/j.bjid.2013.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Revised: 06/29/2013] [Accepted: 07/16/2013] [Indexed: 12/26/2022] Open
Abstract
Objectives Enterotoxigenic Escherichia coli (ETEC), a major cause of diarrhea in children under 5, is an important agent for traveler's diarrhea. Heat-labile enterotoxin (LT) and colonization factors (CFs) are two main virulence mechanisms in ETEC. CS6 is one of the most prevalent CFs consisting of two structural subunits viz., CssA, CssB, necessary for attachment to the intestinal cells. Methods In the present research, a chimeric trivalent protein composed of CssB, CssA and LTB was constructed. The chimeric gene was synthesized with codon bias of E. coli for enhanced expression of the protein. Recombinant proteins were expressed and purified. Mice were immunized with the recombinant protein. The antibody titer and specificity of the immune sera were analyzed by ELISA and Western blotting. Efficiency of the immune sera against ETEC was evaluated. Results Antibody induction was followed by immunization of mice with the chimeric protein. Pretreatment of the ETEC cells with immunized animal antisera remarkably decreased their adhesion to Caco-2 cells. Discussion The results indicate efficacy of the recombinant chimeric protein as an effective immunogen, which induces strong humoral response as well as protection against ETEC adherence and toxicity.
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Nazarian S, Gargari SLM, Rasooli I, Alerasol M, Bagheri S, Alipoor SD. Prevalent Phenotypic and Genotypic Profile of Enterotoxigenic Escherichia coli among Iranian Children. Jpn J Infect Dis 2014; 67:78-85. [DOI: 10.7883/yoken.67.78] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ardekani LS, Gargari SLM, Rasooli I, Bazl MR, Mohammadi M, Ebrahimizadeh W, Bakherad H, Zare H. A novel nanobody against urease activity of Helicobacter pylori. Int J Infect Dis 2013; 17:e723-8. [PMID: 23561799 DOI: 10.1016/j.ijid.2013.02.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 12/03/2012] [Accepted: 02/16/2013] [Indexed: 01/01/2023] Open
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Nazarian S, Gargari SLM, Rasooli I, Hasannia S, Pirooznia N. A PLGA-encapsulated chimeric protein protects against adherence and toxicity of enterotoxigenic Escherichia coli. Microbiol Res 2013; 169:205-12. [PMID: 23906742 DOI: 10.1016/j.micres.2013.06.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/20/2013] [Accepted: 06/14/2013] [Indexed: 01/14/2023]
Abstract
Enterotoxigenic Escherichia coli (ETEC) are the most common cause of diarrhea among children. Colonization factors and enterotoxins are the major ETEC candidate vaccines. Since protection against ETEC mostly occurs by induction of IgA antibodies, much effort is focused on the development of oral vaccines. In this study oral immunogenicity of a poly(lactic-co-glycolic acid) (PLGA) encapsulated chimeric protein containing CfaB, CstH, CotA and LTB (Heat-labile B subunit) was investigated. The protein was encapsulated in PLGA by double emulsion method and nanoparticles were characterized physicochemically. Immunogenicity was assessed by evaluating IgG1, IgG2 and IgA titers after BALB/c mice vaccination. Non aggregated nanoparticles had a spherical shape with an average particle size of 252.7±23 nm and 91.96±4.4% of encapsulation efficiency. Western blotting showed maintenance of the molecular weight and antigenicity of the released protein. Oral immunization of mice induced serum IgG and fecal IgA antibody responses. Immunization induced protection against ETEC binding to Caco-2 cells. The effect of LT toxin on fluid accumulation in ileal loops was neutralized by inhibition of enterotoxin binding to GM1-ganglosides. Delivery of the chimeric protein in PLGA elicited both systemic and mucosal immune responses. The findings could be exploited to development of oral multi-component ETEC prophylactic measures.
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Affiliation(s)
| | | | - Iraj Rasooli
- Department of Biology, Shahed University, Tehran, Iran
| | - Sadegh Hasannia
- Tarbiat Modares University, Faculty of Biological Sciences, Tehran, Iran
| | - Nazanin Pirooznia
- Faculty of Science, Department of Biology, University of Guilan, Rasht, Iran
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Bakherad H, Mousavi Gargari SL, Rasooli I, Rajabibazl M, Mohammadi M, Ebrahimizadeh W, Safaee Ardakani L, Zare H. In Vivo Neutralization of Botulinum Neurotoxins Serotype E with Heavy-chain Camelid Antibodies (VHH). Mol Biotechnol 2013; 55:159-67. [PMID: 23666874 DOI: 10.1007/s12033-013-9669-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Hamid Bakherad
- Department of Biology, Shahed University, Tehran-Qom Express Way, Opposite Imam Khomeini's Shrine, 3319118651, Tehran, Iran
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Dehghani B, Rasooli I, Gargari SLM, Nadooshan MRJ, Owlia P, Nazarian S. Immunogenicity of Salmonella enterica serovar Enteritidis virulence protein, InvH, and cross-reactivity of its antisera with Salmonella strains. Microbiol Res 2013; 168:84-90. [PMID: 23141708 DOI: 10.1016/j.micres.2012.09.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 09/03/2012] [Accepted: 09/09/2012] [Indexed: 11/19/2022]
Affiliation(s)
- Behzad Dehghani
- Department of Biology, Shahed University, Tehran-Qom Express Way, Opposite Imam Khomeini's Shrine, Tehran 3319118651, Iran
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Ameri Shah Reza M, Mousavi Gargari SL, Rasooli I, Jalali Nadoushan M, Ebrahimizadeh W. Inhibition of H. pylori colonization and prevention of gastritis in murine model. World J Microbiol Biotechnol 2012; 28:2513-9. [PMID: 22806157 DOI: 10.1007/s11274-012-1059-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 04/14/2012] [Indexed: 01/15/2023]
Abstract
Helicobacter pylori is a Gram-negative spiral bacterium that colonizes human gastric mucosa causing infection. In this study aiming at inhibition of H. pylori infection we made an attempt to evaluate immunogenicity of the total (UreC) and C-terminal (UreCc) fragments of H. pylori urease. Total UreC and its C-terminal fragment were expressed in E. coli. Recombinant proteins were analyzed by SDS-PAGE and western blot and then purified by Ni-NTA affinity chromatography. Female C57BL6/j mice were immunized with the purified proteins (UreC and UreCc). Antibody titers from isolated sera were measured by ELISA. Immunized mice were then challenged by oral gavage with live H. pylori Sydney strain SS1. Total of 109 CFU were inoculated into stomach of immunized and unimmunized healthy mice three times each at one day interval. Eight weeks after the last inoculation, the blood sample was collected and the serum antibody titer was estimated by ELISA. Stomach tissues from control and experimental animal groups were studied histopathologically. UreC and UreCc yielded recombinant proteins of 61 and 31 kDa respectively. ELIZA confirmed establishment of immunity and the antibodies produced thereby efficiently recognized H. pylori and inhibited its colonization in vivo. Pathological analysis did not reveal established infection in immunized mice challenged with H. pylori. The results support the idea that UreC and UreCc specific antibodies contribute to protection against H. pylori infections.
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