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Eskandari A, Nezhad NG, Leow TC, Rahman MBA, Oslan SN. Essential factors, advanced strategies, challenges, and approaches involved for efficient expression of recombinant proteins in Escherichia coli. Arch Microbiol 2024; 206:152. [PMID: 38472371 DOI: 10.1007/s00203-024-03871-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 12/31/2023] [Accepted: 01/25/2024] [Indexed: 03/14/2024]
Abstract
Producing recombinant proteins is a major accomplishment of biotechnology in the past century. Heterologous hosts, either eukaryotic or prokaryotic, are used for the production of these proteins. The utilization of microbial host systems continues to dominate as the most efficient and affordable method for biotherapeutics and food industry productions. Hence, it is crucial to analyze the limitations and advantages of microbial hosts to enhance the efficient production of recombinant proteins on a large scale. E. coli is widely used as a host for the production of recombinant proteins. Researchers have identified certain obstacles with this host, and given the growing demand for recombinant protein production, there is an immediate requirement to enhance this host. The following review discusses the elements contributing to the manifestation of recombinant protein. Subsequently, it sheds light on innovative approaches aimed at improving the expression of recombinant protein. Lastly, it delves into the obstacles and optimization methods associated with translation, mentioning both cis-optimization and trans-optimization, producing soluble recombinant protein, and engineering the metal ion transportation. In this context, a comprehensive description of the distinct features will be provided, and this knowledge could potentially enhance the expression of recombinant proteins in E. coli.
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Affiliation(s)
- Azadeh Eskandari
- Enzyme and Microbial Technology Research Centre, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
- Department of Biochemistry, FacultyofBiotechnologyand BiomolecularSciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
| | - Nima Ghahremani Nezhad
- Enzyme and Microbial Technology Research Centre, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
| | - Thean Chor Leow
- Enzyme and Microbial Technology Research Centre, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
- Enzyme Technology and X-Ray Crystallography Laboratory, VacBio 5, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
| | | | - Siti Nurbaya Oslan
- Enzyme and Microbial Technology Research Centre, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
- Department of Biochemistry, FacultyofBiotechnologyand BiomolecularSciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
- Enzyme Technology and X-Ray Crystallography Laboratory, VacBio 5, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
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Pouresmaeil M, Azizi-Dargahlou S. Factors involved in heterologous expression of proteins in E. coli host. Arch Microbiol 2023; 205:212. [PMID: 37120438 PMCID: PMC10148705 DOI: 10.1007/s00203-023-03541-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/26/2023] [Accepted: 04/05/2023] [Indexed: 05/01/2023]
Abstract
The production of recombinant proteins is one of the most significant achievements of biotechnology in the last century. These proteins are produced in the eukaryotic or prokaryotic heterologous hosts. By increasing the omics data especially related to different heterologous hosts as well as the presence of new amenable genetic engineering tools, we can artificially engineer heterologous hosts to produce recombinant proteins in sufficient quantities. Numerous recombinant proteins have been produced and applied in various industries, and the global recombinant proteins market size is expected to be cast to reach USD 2.4 billion by 2027. Therefore, identifying the weakness and strengths of heterologous hosts is critical to optimize the large-scale biosynthesis of recombinant proteins. E. coli is one of the popular hosts to produce recombinant proteins. Scientists reported some bottlenecks in this host, and due to the increasing demand for the production of recombinant proteins, there is an urgent need to improve this host. In this review, we first provide general information about the E. coli host and compare it with other hosts. In the next step, we describe the factors involved in the expression of the recombinant proteins in E. coli. Successful expression of recombinant proteins in E. coli requires a complete elucidation of these factors. Here, the characteristics of each factor will be fully described, and this information can help to improve the heterologous expression of recombinant proteins in E. coli.
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Affiliation(s)
- Mahin Pouresmaeil
- Agricultural Biotechnology, Department of Biotechnology, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Shahnam Azizi-Dargahlou
- Agricultural Biotechnology, Department of Biotechnology, Azarbaijan Shahid Madani University, Tabriz, Iran.
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Rauniyar K, Akhondzadeh S, Gąciarz A, Künnapuu J, Jeltsch M. Bioactive VEGF-C from E. coli. Sci Rep 2022; 12:18157. [PMID: 36307539 PMCID: PMC9616921 DOI: 10.1038/s41598-022-22960-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 10/21/2022] [Indexed: 12/31/2022] Open
Abstract
Vascular endothelial growth factor-C (VEGF-C) stimulates lymphatic vessel growth in transgenic models, via viral gene delivery, and as a recombinant protein. Expressing eukaryotic proteins like VEGF-C in bacterial cells has limitations, as these cells lack specific posttranslational modifications and provisions for disulfide bond formation. However, given the cost and time savings associated with bacterial expression systems, there is considerable value in expressing VEGF-C using bacterial cells. We identified two approaches that result in biologically active Escherichia coli-derived VEGF-C. Expectedly, VEGF-C expressed from a truncated cDNA became bioactive after in vitro folding from inclusion bodies. Given that VEGF-C is one of the cysteine-richest growth factors in humans, it was unclear whether known methods to facilitate correct cysteine bond formation allow for the direct expression of bioactive VEGF-C in the cytoplasm. By fusing VEGF-C to maltose-binding protein and expressing these fusions in the redox-modified cytoplasm of the Origami (DE3) strain, we could recover biological activity for deletion mutants lacking the propeptides of VEGF-C. This is the first report of a bioactive VEGF growth factor obtained from E. coli cells circumventing in-vitro folding.
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Affiliation(s)
- Khushbu Rauniyar
- grid.7737.40000 0004 0410 2071Drug Research Program, Faculty of Pharmacy, Biocenter 2, University of Helsinki, P.O.B. 56 (Viikinkaari 5E), 00014 Helsinki, Finland
| | - Soheila Akhondzadeh
- grid.7737.40000 0004 0410 2071Drug Research Program, Faculty of Pharmacy, Biocenter 2, University of Helsinki, P.O.B. 56 (Viikinkaari 5E), 00014 Helsinki, Finland
| | - Anna Gąciarz
- grid.7737.40000 0004 0410 2071Individualized Drug Therapy Research Program, University of Helsinki, Helsinki, Finland
| | - Jaana Künnapuu
- grid.7737.40000 0004 0410 2071Drug Research Program, Faculty of Pharmacy, Biocenter 2, University of Helsinki, P.O.B. 56 (Viikinkaari 5E), 00014 Helsinki, Finland
| | - Michael Jeltsch
- grid.7737.40000 0004 0410 2071Drug Research Program, Faculty of Pharmacy, Biocenter 2, University of Helsinki, P.O.B. 56 (Viikinkaari 5E), 00014 Helsinki, Finland ,grid.7737.40000 0004 0410 2071Individualized Drug Therapy Research Program, University of Helsinki, Helsinki, Finland ,grid.452042.50000 0004 0442 6391Wihuri Research Institute, Helsinki, Finland
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Ferreira AS, Lopacinski A, Batista M, Hiraiwa PM, Guimarães BG, Zanchin NIT. A toolkit for recombinant production of seven human EGF family growth factors in active conformation. Sci Rep 2022; 12:5034. [PMID: 35322149 PMCID: PMC8943033 DOI: 10.1038/s41598-022-09060-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 03/14/2022] [Indexed: 12/17/2022] Open
Abstract
Epidermal growth factors (EGF) play a wide range of roles in embryogenesis, skin development, immune response homeostasis. They are involved in several pathologies as well, including several cancer types, psoriasis, chronic pain and chronic kidney disease. All members share the structural EGF domain, which is responsible for receptor interaction, thereby initiating transduction of signals. EGF growth factors have intense use in fundamental research and high potential for biotechnological applications. However, due to their structural organization with three disulfide bonds, recombinant production of these factors in prokaryotic systems is not straightforward. A significant fraction usually forms inclusion bodies. For the fraction remaining soluble, misfolding and incomplete disulfide bond formation may affect the amount of active factor in solution, which can compromise experimental conclusions and biotechnological applications. In this work, we describe a reliable procedure to produce seven human growth factors of the EGF family in Escherichia coli. Biophysical and stability analyses using limited proteolysis, light scattering, circular dichroism and nanoDSF show that the recombinant factors present folded and stable conformation. Cell proliferation and scratch healing assays confirmed that the recombinant factors are highly active at concentrations as low as 5 ng/ml.
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Affiliation(s)
- Arthur Schveitzer Ferreira
- Laboratory of Structural Biology and Protein Engineering, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil
- Cellular and Molecular Biology Graduate Program, Federal University of Paraná, Curitiba, PR, Brazil
| | - Amanda Lopacinski
- Laboratory of Structural Biology and Protein Engineering, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil
- Cellular and Molecular Biology Graduate Program, Federal University of Paraná, Curitiba, PR, Brazil
| | - Michel Batista
- Mass Spectrometry Facility RPT02H, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil
| | - Priscila Mazzocchi Hiraiwa
- Laboratory of Structural Biology and Protein Engineering, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil
| | - Beatriz Gomes Guimarães
- Laboratory of Structural Biology and Protein Engineering, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil
| | - Nilson Ivo Tonin Zanchin
- Laboratory of Structural Biology and Protein Engineering, Carlos Chagas Institute, FIOCRUZ Paraná, Curitiba, PR, Brazil.
- Cellular and Molecular Biology Graduate Program, Federal University of Paraná, Curitiba, PR, Brazil.
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Sedlář A, Trávníčková M, Matějka R, Pražák Š, Mészáros Z, Bojarová P, Bačáková L, Křen V, Slámová K. Growth Factors VEGF-A 165 and FGF-2 as Multifunctional Biomolecules Governing Cell Adhesion and Proliferation. Int J Mol Sci 2021; 22:1843. [PMID: 33673317 PMCID: PMC7917819 DOI: 10.3390/ijms22041843] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 12/11/2022] Open
Abstract
Vascular endothelial growth factor-A165 (VEGF-A165) and fibroblast growth factor-2 (FGF-2) are currently used for the functionalization of biomaterials designed for tissue engineering. We have developed a new simple method for heterologous expression and purification of VEGF-A165 and FGF-2 in the yeast expression system of Pichia pastoris. The biological activity of the growth factors was assessed in cultures of human and porcine adipose tissue-derived stem cells (ADSCs) and human umbilical vein endothelial cells (HUVECs). When added into the culture medium, VEGF-A165 stimulated proliferation only in HUVECs, while FGF-2 stimulated the proliferation of both cell types. A similar effect was achieved when the growth factors were pre-adsorbed to polystyrene wells. The effect of our recombinant growth factors was slightly lower than that of commercially available factors, which was attributed to the presence of some impurities. The stimulatory effect of the VEGF-A165 on cell adhesion was rather weak, especially in ADSCs. FGF-2 was a potent stimulator of the adhesion of ADSCs but had no to negative effect on the adhesion of HUVECs. In sum, FGF-2 and VEGF-A165 have diverse effects on the behavior of different cell types, which maybe utilized in tissue engineering.
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Affiliation(s)
- Antonín Sedlář
- Laboratory of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (A.S.); (M.T.); or or (Š.P.)
- Department of Physiology, Faculty of Science, Charles University, Viničná 7, CZ 12844 Praha 2, Czech Republic
| | - Martina Trávníčková
- Laboratory of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (A.S.); (M.T.); or or (Š.P.)
| | - Roman Matějka
- Laboratory of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (A.S.); (M.T.); or or (Š.P.)
- Faculty of Biomedical Engineering, Czech Technical University in Prague, CZ 27201 Kladno, Czech Republic;
| | - Šimon Pražák
- Laboratory of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (A.S.); (M.T.); or or (Š.P.)
- Faculty of Biomedical Engineering, Czech Technical University in Prague, CZ 27201 Kladno, Czech Republic;
| | - Zuzana Mészáros
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (Z.M.); (V.K.)
- Department of Biochemistry, University of Chemistry and Technology Prague, Technická 6, CZ 16628 Praha 6, Czech Republic
| | - Pavla Bojarová
- Faculty of Biomedical Engineering, Czech Technical University in Prague, CZ 27201 Kladno, Czech Republic;
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (Z.M.); (V.K.)
| | - Lucie Bačáková
- Laboratory of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (A.S.); (M.T.); or or (Š.P.)
| | - Vladimír Křen
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (Z.M.); (V.K.)
| | - Kristýna Slámová
- Laboratory of Biotransformation, Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, CZ 14220 Praha 4, Czech Republic; (Z.M.); (V.K.)
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Kim YS, Lee HJ, Han MH, Yoon NK, Kim YC, Ahn J. Effective production of human growth factors in Escherichia coli by fusing with small protein 6HFh8. Microb Cell Fact 2021; 20:9. [PMID: 33413407 PMCID: PMC7791764 DOI: 10.1186/s12934-020-01502-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 12/23/2020] [Indexed: 12/12/2022] Open
Abstract
Background Growth factors (GFs) are signaling proteins that affect cellular processes such as growth, proliferation, and differentiation. GFs are used as cosmeceuticals, exerting anti-wrinkle, anti-aging, and whitening effects, and also as pharmaceuticals to treat wounds, growth failure, and oral mucositis. However, in mammalian and bacterial cells, low productivity and expression in inclusion bodies, respectively, of GFs does not satisfy the consumer demand. Here, we aimed to develop a bacterial expression system that produces high yields of soluble GFs that can be purified in their native forms. Results We present Fh8, an 8-kDa peptide from Fasciola hepatica with an N-terminal hexa-histidine (6HFh8), as a fusion partner for enhanced human GF production in recombinant Escherichia coli. The fusion partner harboring a tobacco etch virus (TEV) protease cleavage site was fused to the N-terminus of 10 human GFs: acidic and basic fibroblast growth factors (aFGF and bFGF, respectively), epidermal growth factor (EGF), human growth hormone (hGH), insulin-like growth factor 1 (IGF-1), vascular endothelial growth factor 165 (VEGF165), keratinocyte growth factor 1 (KGF-1), placental growth factor (PGF), stem cell factor (SCF), and tissue inhibitor of metalloproteinase 1 (TIMP-1). The fusion proteins were expressed in E. coli under the control of T7 promoter at three temperatures (25 °C, 30 °C, and 37 °C). All individual fusion proteins, except for SCF and TIMP-1, were successfully overexpressed in cytoplasmic soluble form at more than one temperature. Further, the original aFGF, IGF-1, EGF, and VEGF165 proteins were cleaved from the fusion partner by TEV protease. Five-liter fed-batch fermentation approaches for the 6HFh8-aFGF (lacking disulfide bonds) and 6HFh8-VEGF165 (a cysteine-rich protein) were devised to obtain the target protein at concentrations of 9.7 g/l and 3.4 g/l, respectively. The two GFs were successfully highly purified (> 99% purity). Furthermore, they exerted similar cell proliferative effects as those of their commercial equivalents. Conclusions We demonstrated that 6HFh8-GF fusion proteins could be overexpressed on a g/l scale in the cytoplasm of E. coli, with the GFs subsequently highly purified and maintaining their biological activity. Hence, the small protein 6HFh8 can be used for efficient mass-production of various GFs.
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Affiliation(s)
- Young Su Kim
- Department of Chemical and Biomolecular Engineering, KAIST, Daejeon, 34141, Republic of Korea.,Biotechnology Process Engineering Center, KRIBB, Cheongju, 28116, Republic of Korea
| | - Hye-Jeong Lee
- Biotechnology Process Engineering Center, KRIBB, Cheongju, 28116, Republic of Korea
| | - Man-Ho Han
- Biotechnology Process Engineering Center, KRIBB, Cheongju, 28116, Republic of Korea.,Department of Bioprocess Engineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Nam-Kyung Yoon
- Biotechnology Process Engineering Center, KRIBB, Cheongju, 28116, Republic of Korea
| | - Yeu-Chun Kim
- Department of Chemical and Biomolecular Engineering, KAIST, Daejeon, 34141, Republic of Korea.
| | - Jungoh Ahn
- Biotechnology Process Engineering Center, KRIBB, Cheongju, 28116, Republic of Korea. .,Department of Bioprocess Engineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
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Memanishvili T, Monni E, Tatarishivili J, Lindvall O, Tsiskaridze A, Kokaia Z, Tornero D. Poly(ester amide) microspheres are efficient vehicles for long-term intracerebral growth factor delivery and improve functional recovery after stroke. Biomed Mater 2020; 15:065020. [DOI: 10.1088/1748-605x/aba4f6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Solis LH, Ayala Y, Portillo S, Varela-Ramirez A, Aguilera R, Boland T. Thermal inkjet bioprinting triggers the activation of the VEGF pathway in human microvascular endothelial cells in vitro. Biofabrication 2019; 11:045005. [PMID: 31151129 DOI: 10.1088/1758-5090/ab25f9] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
One biofabrication process that has gained tremendous momentum in the field of tissue engineering and regenerative medicine is cell-printing or most commonly bioprinting. We have shown that thermal inkjet bioprinted human microvascular endothelial cells were recruited or otherwise involved in the formation of microvasculature to form graft-host anastomoses upon implantation. The present study aims to quantify and characterize the expression and activation of specific cytokines and kinases in vitro. Morphological characteristics demonstrate elongated protrusions of TIB-HMVECs at 5-6 times the size of manually pipetted cells. Moreover, annexin V-FITC and propidium iodide apoptosis assay via flow cytometry demonstrated a 75% apoptosis among printed cells as compared to among control cells. Cell viability at a 3 d incubation period was significantly higher for printed cells as compared to control. Milliplex magnetic bead panels confirmed significant overexpression of HSP70, IL-1α, VEGF-A, IL-8, and FGF-1 of printed cells compared to control. In addition, a Human phospho-kinase array displayed a significant over activation of the heat-shock proteins HSP27 and HSP60 of printed cells compared to the manually seeded cells. Collectively, it is suggested that the massive appearance of capillary blood vessels upon implantation that has been reported elsewhere may be due to the activation of the HSP-NF-κB pathway to produce VEGF. This cell activation may be used as a new strategy for vascularization of tissue engineered constructs which are in high demand in regenerative medicine applications.
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Affiliation(s)
- Luis H Solis
- Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, United States of America. Border Biomedical Research Center, Department of Biological Sciences, The University of Texas at El Paso, El Paso, TX 79968, United States of America
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Zhou Y, Lu Z, Wang X, Selvaraj JN, Zhang G. Genetic engineering modification and fermentation optimization for extracellular production of recombinant proteins using Escherichia coli. Appl Microbiol Biotechnol 2017; 102:1545-1556. [DOI: 10.1007/s00253-017-8700-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 12/05/2017] [Accepted: 12/06/2017] [Indexed: 02/06/2023]
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Kaplan O, Zárubová J, Mikulová B, Filová E, Bártová J, Bačáková L, Brynda E. Correction: Enhanced Mitogenic Activity of Recombinant Human Vascular Endothelial Growth Factor VEGF121 Expressed in E. coli Origami B (DE3) with Molecular Chaperones. PLoS One 2017; 12:e0169590. [PMID: 28046041 PMCID: PMC5207444 DOI: 10.1371/journal.pone.0169590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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