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A Novel Approach of Antiviral Drugs Targeting Viral Genomes. Microorganisms 2022; 10:microorganisms10081552. [PMID: 36013970 PMCID: PMC9414836 DOI: 10.3390/microorganisms10081552] [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: 06/03/2022] [Revised: 07/25/2022] [Accepted: 07/29/2022] [Indexed: 11/16/2022] Open
Abstract
Outbreaks of viral diseases, which cause morbidity and mortality in animals and humans, are increasing annually worldwide. Vaccines, antiviral drugs, and antibody therapeutics are the most effective tools for combating viral infection. The ongoing coronavirus disease 2019 pandemic, in particular, raises an urgent need for the development of rapid and broad-spectrum therapeutics. Current antiviral drugs and antiviral antibodies, which are mostly specific at protein levels, have encountered difficulties because the rapid evolution of mutant viral strains resulted in drug resistance. Therefore, degrading viral genomes is considered a novel approach for developing antiviral drugs. The current article highlights all potent candidates that exhibit antiviral activity by digesting viral genomes such as RNases, RNA interference, interferon-stimulated genes 20, and CRISPR/Cas systems. Besides that, we introduce a potential single-chain variable fragment (scFv) that presents antiviral activity against various DNA and RNA viruses due to its unique nucleic acid hydrolyzing characteristic, promoting it as a promising candidate for broad-spectrum antiviral therapeutics.
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Sharp JH, Clements K, Diggens M, McDonald JE, Malham SK, Jones DL. E. coli Is a Poor End-Product Criterion for Assessing the General Microbial Risk Posed From Consuming Norovirus Contaminated Shellfish. Front Microbiol 2021; 12:608888. [PMID: 33679634 PMCID: PMC7933002 DOI: 10.3389/fmicb.2021.608888] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 01/18/2021] [Indexed: 11/13/2022] Open
Abstract
The fecal indicator organism (FIO) Escherichia coli is frequently used as a general indicator of sewage contamination and for evaluating the success of shellfish cleaning (depuration) processes. To evaluate the robustness of this approach, the accumulation, retention, and depuration of non-pathogenic E. coli, pathogenic E. coli O157:H7 and norovirus GII (NoV GII) RNA were evaluated using a combination of culture-based (E. coli) and molecular methods (E. coli, NoV GII) after exposure of mussels (Mytilus edulis) to water contaminated with human feces. We simulated water contamination after a point-source release from a combined sewer overflow (CSO) where untreated wastewater is released directly into the coastal zone. All three microbiological indicators accumulated rapidly in the mussels, reaching close to maximum concentration within 3 h of exposure, demonstrating that short CSO discharges pose an immediate threat to shellfish harvesting areas. Depuration (72 h) in clean water proved partially successful at removing both pathogenic and non-pathogenic E. coli from shellfish tissue, but failed to eradicate NoV GII RNA. We conclude that current EU standards for evaluating microbiological risk in shellfish are inadequate for protecting consumers against exposure to human norovirus GII found in polluted marine waters.
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Affiliation(s)
- Jasmine H Sharp
- School of Ocean Sciences, Bangor University, Bangor, United Kingdom
| | - Katie Clements
- School of Ocean Sciences, Bangor University, Bangor, United Kingdom.,School of Natural Sciences, Bangor University, Bangor, United Kingdom
| | - Mallory Diggens
- School of Natural Sciences, Bangor University, Bangor, United Kingdom
| | - James E McDonald
- School of Natural Sciences, Bangor University, Bangor, United Kingdom
| | - Shelagh K Malham
- School of Ocean Sciences, Bangor University, Bangor, United Kingdom
| | - Davey L Jones
- School of Natural Sciences, Bangor University, Bangor, United Kingdom.,UWA School of Agriculture and Environment, University of Western Australia, Perth, WA, Australia
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Sureshkumar S, Jung SK, Kim D, Oh KB, Yang H, Lee HC, Jo YJ, Lee HS, Lee S, Byun SJ. Administration of L. salivarius expressing 3D8 scFv as a feed additive improved the growth performance, immune homeostasis, and gut microbiota of chickens. Anim Sci J 2020; 91:e13399. [PMID: 32512648 DOI: 10.1111/asj.13399] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/02/2020] [Accepted: 04/24/2020] [Indexed: 12/24/2022]
Abstract
Probiotics have been defined as live microorganisms that are administered in an appropriate amount to provide health benefits to the host animal. In this study, we investigated the effect of L. salivarius DJ-sa-01 secreting the 3D8 single-chain variable fragment (3D8 scFv) on the growth performance, cytokine secretion, and intestinal microbial flora of chickens. The experiment was divided into the control group and L. salivarius expressing 3D8 scFv experimental group. Chicken was fed 109 colony-forming units (CFUs) of wild-type (WT) L. salivarius or 3D8 scFv-secreting L. salivarius daily for 35 days. The administration of L. salivarius expressing 3D8 scFv significantly improved the body weight of chickens compared with the administration of WT L. salivarius. A 16S ribosomal RNA metagenomic analysis showed that Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes were the dominant phyla in both experimental groups. At the genus level, Lactobacillus was more abundant (22.82%) in the L. salivarius/3D8 group compared with the WT L. salivarius group. The serum levels of cytokines, such as IL-8, TNF-α, IL-1β, IFN-γ, IL-4, and IGF1, were significantly reduced in the L. salivarius/3D8-treated chickens. In summary, our results suggest that L. salivarius expressing 3D8 scFv could be considered a feed additive for improving the growth performance, immune function, and disease resistance of poultry.
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Affiliation(s)
- Shanmugam Sureshkumar
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea.,Department of Animal Resource and Science, Dankook University, Cheonan, Republic of Korea
| | - Sun Keun Jung
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Dongjun Kim
- Department of Integrative Biotechnology, Sungkyunkwan University, Gyeonggi-do, Republic of Korea
| | - Keon Bong Oh
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Hyeon Yang
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Hwi Cheul Lee
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Yong Jin Jo
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Hae Sun Lee
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
| | - Sukchan Lee
- Department of Integrative Biotechnology, Sungkyunkwan University, Gyeonggi-do, Republic of Korea
| | - Sung June Byun
- Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Wanju-gun, Republic of Korea
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Choi H, Lee SI, Sureshkumar S, Jeon MH, Kim JS, Park MR, Kim KW, Jeon IS, Lee S, Byun SJ. Avian influenza virus transmission is suppressed in chickens fed Lactobacillus paracasei expressing the 3D8 single-chain variable fragment protein. Acta Vet Hung 2019; 67:610-618. [PMID: 31842597 DOI: 10.1556/004.2019.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The 3D8 single-chain variable fragment (scFv) is a mini-antibody sequence with independent nuclease activity that shows antiviral effects against all types of viruses in chickens and mice. In this study, chickens were treated daily with an oral dose of 109 CFU Lactobacillus paracasei (L. paracasei) expressing either a secreted or anchored 3D8 scFv for three weeks. After L. paracasei administration, the chickens were challenged with avian influenza virus (AIV). From each experimental group, three chickens were directly infected with 100 µL of 107.5 EID50/mL H9N2 AIV and seven chickens were indirectly challenged through contact transmission. oropharyngeal and cloacal swab samples were collected at 3, 5, 7, and 9 days post-inoculation (dpi) from AIV-challenged chickens, AIV Shedding titres were measured by quantitative real-time PCR. Contact transmission in the chickens that were fed 3D8 scFv-secreting L. paracasei showed a significant reduction in viral shedding when compared with other groups. These results suggest that L. paracasei secreting 3D8 provides a basis for the development of ingestible antiviral probiotics with activity against AIV.
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Affiliation(s)
- Hoonsung Choi
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Sang In Lee
- 2Department of Animal Biotechnology, Kyungpook National University, Sangju, Gyeongsangbuk-do, Republic of Korea
| | - Shanmugam Sureshkumar
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Mi-Hyang Jeon
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Jeom Sun Kim
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Mi-Ryung Park
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Kyung-Woon Kim
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Ik-Soo Jeon
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Sukchan Lee
- 3Department of Genetic Engineering, Sungkyunkwan University, Seobu-ro, Jangan-gu, Suwon, Republic of Korea
| | - Sung June Byun
- 1Animal Biotechnology Division, National Institute of Animal Science, RDA, 1500 Kongjwipatjwi-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
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