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Santos JC, Handa S, Fernandes LGV, Bleicher L, Gandin CA, de Oliveira-Neto M, Ghosh P, Nascimento ALTO. Structural and biochemical characterization of Leptospira interrogans Lsa45 reveals a penicillin-binding protein with esterase activity. Process Biochem 2023; 125:141-153. [PMID: 36643388 PMCID: PMC9836055 DOI: 10.1016/j.procbio.2022.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Leptospirosis is a bacterial disease that affects humans and animals and is caused by Leptospira. The recommended treatment for leptospirosis is antibiotic therapy, which should be given early in the course of the disease. Despite the use of these antibiotics, their role during the course of the disease is still not completely clear because of the lack of effective clinical trials, particularly for severe cases of the disease. Here, we present the characterization of L. interrogans Lsa45 protein by gel filtration, protein crystallography, SAXS, fluorescence and enzymatic assays. The oligomeric studies revealed that Lsa45 is monomeric in solution. The crystal structure of Lsa45 revealed the presence of two subdomains: a large α/β subdomain and a small α-helical subdomain. The large subdomain contains the amino acids Ser122, Lys125, and Tyr217, which correspond to the catalytic triad that is essential for β-lactamase or serine hydrolase activity in similar enzymes. Additionally, we also confirmed the bifunctional promiscuity of Lsa45, in hydrolyzing both the 4-nitrophenyl acetate (p-NPA) and nitrocefin β-lactam antibiotic. Therefore, this study provides novel insights into the structure and function of enzymes from L. interrogans, which furthers our understanding of this bacterium and the development of new therapies for the prevention and treatment of leptospirosis.
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Affiliation(s)
- Jademilson C. Santos
- Laboratório de Desenvolvimento de Vacinas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503-900, São Paulo, SP, Brazil
- Instituto Federal da Bahia – IFBA - Rodovia BR-367, R. José Fontana, 1, 45810-000, Porto Seguro - BA, Brazil
| | - Sumit Handa
- Department of Chemistry & Biochemistry, University of California, San Diego, CA 92093, USA
| | - Luis G. V. Fernandes
- Laboratório de Desenvolvimento de Vacinas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503-900, São Paulo, SP, Brazil
| | - Lucas Bleicher
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - César A. Gandin
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, Dep. de Física e Biofísica, Botucatu, SP, Brazil
| | - Mario de Oliveira-Neto
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, Dep. de Física e Biofísica, Botucatu, SP, Brazil
| | - Partho Ghosh
- Department of Chemistry & Biochemistry, University of California, San Diego, CA 92093, USA
| | - Ana Lucia T. O. Nascimento
- Laboratório de Desenvolvimento de Vacinas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503-900, São Paulo, SP, Brazil
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Zhang W, Song N, Gao Y, Xie X, Liu K, Cao Y, Jin N. Astragalus polysaccharides protects against acute leptospirosis by glycolysis-depended priming effect. Biomed Pharmacother 2022; 151:113198. [PMID: 35676790 DOI: 10.1016/j.biopha.2022.113198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/22/2022] [Accepted: 05/23/2022] [Indexed: 11/02/2022] Open
Abstract
Leptospirosis, caused by pathogenic leptospira, is a neglected infectious disease that causes acute kidney injury, bleeding disorders, and even death. People can become infected with leptospirosis when they travel into epidemic areas. Except for vaccines and antibiotics, there are few reports of other drugs about prevention of leptospirosis. In this study, we show that the natural molecular compound, astragalus polysaccharides (APS), prevents against acute leptospirosis in hamsters. Pretreatment with APS improved the survival rate of hamsters with more minor organ damage and lower leptospira burden. After pretreatment with APS, the expression levels of leptospira-induced TLR2, TLR4, and TNF-α were enhanced. The priming effect of APS was studied in vitro. The data showed that leptospira-induced expressions of TNF-α and IL-1β were higher in APS-primed peritoneal macrophage, with enhanced glucose consumption and lactate production. Transcriptomic analysis revealed that pretreatment with APS down regulated respiratory chain and mitochondrial function, up regulated glycolysis related gene expressions. After pretreatment with glycolysis inhibitor (2-DG), the priming effect of APS in leptospira infection was inhibited. Our results indicated that pretreatment with natural molecular compound, APS, protected against acute leptospirosis in hamsters by priming effect through enhanced glycolysis.
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Affiliation(s)
- Wenlong Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China; Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Ning Song
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Yuan Gao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Xufeng Xie
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Kun Liu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Yongguo Cao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China; Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Ningyi Jin
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, People's Republic of China.
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Wang J, Zhang W, Jin Z, Ding Y, Zhang S, Wu D, Cao Y. A lethal model of Leptospira infection in hamster nasal mucosa. PLoS Negl Trop Dis 2022; 16:e0010191. [PMID: 35192629 PMCID: PMC8863242 DOI: 10.1371/journal.pntd.0010191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 01/21/2022] [Indexed: 02/07/2023] Open
Abstract
Leptospirosis is a fatal zoonosis caused by contact between skin or a mucosal surface and contaminated soil or water. Hamsters were infected by intraperitoneal injection fto establish experimental leptospirosis, which is not a natural route of infection. There are no reports of nasal mucosal infection in hamsters. In this study, infection of the nasal mucosa was performed to establish a model of natural infection. Both methods of infection can cause lethal models with similar symptoms in the later stages of infection, such as weight loss, blood concentration, increased neutrophils (GRAN), and decreased lymphocytes (LYM) in the blood, severe organ damage and liver function obstruction. The burden of Leptospira in the organs and blood was lower in the mucosal inoculation groups at 1 day after infection. However, mucosal infection induced a higher Leptospira burden in urine than intraperitoneal infection in the late stages of infection. After nasal mucosal infection, antibody levels were higher and lasted longer. These results indicated that the route of nasal mucosal infection is a good choice for studying leptospirosis in hamsters. The establishment of a leptospirosis experimental model is still key to elucidating the pathogenesis of leptospirosis. Hamsters were infected by intraperitoneal injection to establish experimental leptospirosis, although this is not a natural route of infection. The transmission characteristics of Leptospira and the disease progression in hamsters infected by a natural transmission route (e.g. through mucosal surfaces) had not been explored. In this study, we compared the dynamics of Leptospira infection in hamsters inoculated via the nasal mucosa or by intraperitoneal inoculation, and compared the burden of Leptospira and the level of antibodies produced with disease progression, such as body weight, serology, haematological changes and histopathological changes. Our data suggested that there are significant differences in the dynamics of infection between intraperitoneal and mucosal infection pathways. Although the result was the same in the later stage of infection, the course of mucosal infection was slower, which may better recapitulate the natural history of the disease, assist in studying kidney disease caused by Leptospira, and provide an animal model for the study of leptospirosis mucosal immunity.
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Affiliation(s)
- Jiaqi Wang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
| | - Wenlong Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
| | - Zhao Jin
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
| | - Yue Ding
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
| | - Shilei Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
| | - Dianjun Wu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
- * E-mail: (DW); (YC)
| | - Yongguo Cao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China
- * E-mail: (DW); (YC)
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4
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Xie X, Zhang W, Chen X, Wu D, Cao Y. Norfloxacin suppresses Leptospira-induced inflammation through inhibiting p65 and ERK phosphorylation and NLRP3 inflammasome activation. Microb Pathog 2021; 162:105315. [PMID: 34826552 DOI: 10.1016/j.micpath.2021.105315] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/22/2021] [Accepted: 11/22/2021] [Indexed: 01/15/2023]
Abstract
Leptospirosis is a worldwide re-emerging zoonosis caused by pathogenic Leptospira. Inflammatory storms induced by Leptospira are the reason to induce immunoparalysis and organ failures. Antibiotics are still the current mainstream treatment for leptospirosis. In addition to their antibacterial action, the immunomodulatory function of antibiotics has been paid more and more attention. In this study, the role of norfloxacin on Leptospira-induced inflammation was investigated. Treatment with norfloxacin down-regulated Leptospira-induced IL-1β and TNF-α both in vivo and vitro models. Further study showed that norfloxacin inhibited Leptospira-induced phosphorylation of p65 and ERK. Norfloxacin also inhibited the Leptospira-induced NLRP3 inflammasome activation with the increased level of Na/K-ATPase Pump β1 subunit and decreased level of Kcnk6. These results indicated that norfloxacin suppressed Leptospira-induced inflammation through inhibiting p65 and ERK phosphorylation and NLRP3 inflammasome activation. Norfloxacin may be a potential candidate for suppressing inflammatory storms caused by Leptospira.
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Affiliation(s)
- Xufeng Xie
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, 130062, People's Republic of China.
| | - Wenlong Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, 130062, People's Republic of China.
| | - Xi Chen
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, 130062, People's Republic of China.
| | - Dianjun Wu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, 130062, People's Republic of China.
| | - Yongguo Cao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, 130062, People's Republic of China.
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Hetrick K, Harkin KR, Peddireddi L, Henningson J. Evaluation by polymerase chain reaction assay of persistent shedding of pathogenic leptospires in the urine of dogs with leptospirosis. J Vet Intern Med 2021; 36:133-140. [PMID: 34799884 PMCID: PMC8783323 DOI: 10.1111/jvim.16309] [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: 03/31/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Persistent leptospiruria in naturally infected dogs occurs despite appropriate antibiotic treatment. HYPOTHESIS/OBJECTIVES To determine the frequency of persistent leptospiruria in naturally infected dogs and the association of persistent leptospiruria with different antibiotic treatments. ANIMALS Thirty-two dogs of varying age and breed diagnosed with leptospirosis via urine polymerase chain reaction assay (PCR). METHODS A prospective observational study of dogs diagnosed with leptospirosis was undertaken to determine the frequency of persistent leptospiruria as determined by PCR. Clinical presentation of leptospirosis, antibiotic treatment, serum creatinine concentration, and outcome were recorded. RESULTS Fifteen of 32 dogs had a negative urine PCR on the first submission in the study, 5 of 15 received only an aminopenicillin. The remaining 17 dogs had a negative urine PCR on the second (n = 6 dogs), third (n = 5), fourth (n = 5), and eighth (n = 1) submissions. Acute kidney injury was reported in 32/32 dogs. Two of 32 dogs developed chronic kidney disease. CONCLUSIONS AND CLINICAL IMPORTANCE Persistent leptospiruria is common despite treatment with antibiotics frequently recommended for treatment. Follow-up urine PCR to confirm clearance of the organism is recommended in all dogs. In dogs with persistent leptospiruria, chronic kidney disease can develop after acute kidney injury.
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Affiliation(s)
- Katie Hetrick
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
| | - Kenneth R Harkin
- Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
| | - Lalitha Peddireddi
- Kansas State Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
| | - Jamie Henningson
- Kansas State Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
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6
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Emergency vaccine immunization protects hamsters against acute leptospirosis. Microb Pathog 2021; 161:105274. [PMID: 34774700 DOI: 10.1016/j.micpath.2021.105274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/20/2021] [Accepted: 10/27/2021] [Indexed: 10/19/2022]
Abstract
Leptospirosis, caused by pathogenic Leptospira, is a global critical zoonotic disease in terms of mortality and morbidity. Vaccines are often used to prevent leptospirosis. However, few studies have reported the therapeutic effect of a vaccine against Leptospira infection. This study demonstrates the efficacy of the emergency vaccine immunization against acute leptospirosis in hamsters. Treatment with a whole-cell vaccine (Leptospira interrogans serovar Lai) at 24 h post-infection improved the survival rate of hamsters with lower leptospiral burden and minor pathological damage to organs. The vaccine also protected against multiple Leptospira serotypes acute infection. However, the protective effect of the vaccines was lost when beginning treatment at 36 h or 48 h post-infection. These results indicated that vaccines could treat acute leptospirosis in hamsters, but only if immunization is within 24 h after infection.
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7
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Dias CS, Paz LN, Solcà MS, Portela RWD, Bittencourt MV, Pinna MH. Kidney Injury Molecule-1 in the detection of early kidney injury in dogs with leptospirosis. Comp Immunol Microbiol Infect Dis 2021; 76:101637. [PMID: 33706047 DOI: 10.1016/j.cimid.2021.101637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 11/26/2022]
Abstract
Renal damage, a common feature in canine leptospirosis, ranges from a subclinical affection to kidney dysfunction and death. Chances of recovery can be improved by early intervention. However, traditional biomarkers (serum urea and creatinine) have limited relevance for precocity. Kidney Injury Molecule-1 (KIM-1) is a transmembrane protein upregulated in early stages of tubular injury. This study evaluated the use of urinary KIM-1 to detect early renal injury in naturally occurring canine leptospirosis. This exploratory research included 30 dogs divided into two groups: (1) dogs with leptospirosis (n = 25) and (2) healthy dogs (n = 5). Leptospira sp. infection was diagnosed through urine PCR and/or direct bacteriologic culture and/or serology (single MAT titters ≥800). Additionally, stage of infection was further characterized in acute and subacute phases based on the onset of clinical symptoms from 3 to 7 days. Urinary KIM-1 (uKIM-1) concentrations were measured in both groups with a commercial canine ELISA kit. uKIM-1 levels were statistically different (P < 0.01) between the studied groups, especially in non-azotemic dogs (P = 0.0042). The biomarker showed 88 % sensibility to diagnosis of kidney injury at> 1.49 ng/mL cut-off. Urine KIM-1 was negatively correlated with urine specific gravity (USG) but accompanied histopathological evidence of renal degeneration, necrosis and regeneration processes, extending information on kidney health. Measurement of KIM-1 in the urine of canine patients was able to detect naturally occurring acute and subacute leptospirosis accompanied by tubular injury in early non-azotemic infections.
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Affiliation(s)
- C S Dias
- Bacterial Disease Laboratory, Federal University of Bahia, 500 Adhemar de Barros Av., Salvador, BA 40170-110, Brazil
| | - L N Paz
- Bacterial Disease Laboratory, Federal University of Bahia, 500 Adhemar de Barros Av., Salvador, BA 40170-110, Brazil
| | - M S Solcà
- Department of Preventive Veterinary Medicine and Animal Production of the School of Veterinary Medicine and Zootechny, Federal University of Bahia, 500 Adhemar de Barros Av., Salvador, BA 40170-110, Brazil
| | - R W D Portela
- Laboratory of Immunology and Molecular Biology, Health Science Institute, Federal University of Bahia, Reitor Miguel Calmon Av., Salvador, BA 40140-100, Brazil
| | - M V Bittencourt
- Bacterial Disease Laboratory, Federal University of Bahia, 500 Adhemar de Barros Av., Salvador, BA 40170-110, Brazil
| | - M H Pinna
- Bacterial Disease Laboratory, Federal University of Bahia, 500 Adhemar de Barros Av., Salvador, BA 40170-110, Brazil.
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8
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Study of self-assembly system of norfloxacin molecularly imprinted polymers based on simulated design. Theor Chem Acc 2021. [DOI: 10.1007/s00214-020-02712-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Song N, Zhang W, Ding Y, Wu D, Dai Z, Xu L, Cao Y. Preliminary Characterization of Dog Derived Pathogenic Strains of Leptospira interrogans Serovar Australis in Nanchang of Jiangxi Province, China. Front Vet Sci 2021; 7:607115. [PMID: 33521082 PMCID: PMC7841341 DOI: 10.3389/fvets.2020.607115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 12/07/2020] [Indexed: 12/17/2022] Open
Abstract
Leptospirosis is a global zoonotic disease caused by pathogenic Leptospira, and those infected animals will show a variety of clinical symptoms and even death. The discovery of endemic strains is crucial to produce effective vaccines. In this study, we report that a strain of Leptospira, isolated from a dog, is pathogenic. Using MLST analysis, the serovar of isolated Leptospira was identified and found it belongs to Leptospira interrogation Serovar Australis. Then, the virulence of this strain was researched by using hamsters. After infection, all the hamsters died within 4-5 days. Typical pathological changes were found in the liver, kidney, and lung of hamsters. These results all indicated that the isolated Leptospira was pathogenic. Thus, this study facilitates to identifying local Leptospira strains and develop a more targeted canine Leptospira vaccine.
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Affiliation(s)
- Ning Song
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Wenlong Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yue Ding
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Dianjun Wu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Zonghao Dai
- Nanchang Police Dog Base of the Ministry of Public Security, Nanchang, China
| | - Li Xu
- Nanchang Police Dog Base of the Ministry of Public Security, Nanchang, China
| | - Yongguo Cao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
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10
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Kim SW, Kim YY, Kim H, Ku SY. Animal models closer to intrauterine adhesive pathology. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:1125. [PMID: 33240974 PMCID: PMC7576092 DOI: 10.21037/atm-20-3598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Sung Woo Kim
- Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, South Korea
| | - Yoon Young Kim
- Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, South Korea
| | - Hoon Kim
- Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, South Korea
| | - Seung-Yup Ku
- Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, South Korea
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Zhang W, Xie X, Wang J, Song N, Lv T, Wu D, Zhang N, Cao Y. Increased inflammation with crude E. coli LPS protects against acute leptospirosis in hamsters. Emerg Microbes Infect 2020; 9:140-147. [PMID: 31914888 PMCID: PMC6968624 DOI: 10.1080/22221751.2019.1710435] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Leptospirosis is a worldwide zoonotic disease that causes acute kidney injury, liver disease, bleeding disorders, and even death. Treatment of the disease is largely dependent on the use of antibiotics, but recent studies on pathogenesis of leptospirosis have shown that immunomodulation may also be an effective treatment for this disease. Since the delay in inflammation correlates with higher pathogenicity of leptospira, we studied the effect of inducing inflammation on leptospirosis by using TLR4 activator LPS. In accordance with our hypothesis, treatment with LPS protected against leptospirosis by enhancing the inflammatory response in hamsters. The gene expression levels of TLR2, TLR4, NLRP3 and inflammatory factors were higher in LPS-treated group during leptospira infection in hamsters. Although the levels of NO and iNOS were higher in LPS-treated group than in Leptospira-infected group, the protective effect induced by LPS is iNOS-independent. Treatment with LPS induced higher anti-leptospira IgG level than infection with leptospira alone. Then, expressions of costimulatory molecules and maturation markers were analysed. The data showed that treatment with LPS enhanced the expression of CD40, CD80 and CD86. Our results indicate that increased inflammation induced by LPS derived from Escherichia coli (E. coli) protects against leptospirosis in hamsters.
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Affiliation(s)
- Wenlong Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China.,Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Xufeng Xie
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China.,Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Jiaqi Wang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Ning Song
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Tianbao Lv
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Dianjun Wu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Naisheng Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
| | - Yongguo Cao
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China.,Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China
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12
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Mauro T, Harkin K. Persistent Leptospiruria in Five Dogs Despite Antimicrobial Treatment (2000-2017). J Am Anim Hosp Assoc 2018; 55:42-47. [PMID: 30427719 DOI: 10.5326/jaaha-ms-6882] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In dogs with leptospirosis, doxycycline therapy is recommended as the preferred therapy for its ability to eliminate the organism from all tissues, including the renal tubules. Elimination of organisms from the renal tubules terminates leptospiruria and prevents transmission of the organism. This report describes the discovery of persistent leptospiruria in the face of therapy with doxycycline in four dogs and enrofloxacin in one dog. Leptospiruria was confirmed by polymerase chain reaction testing for pathogenic leptospires in all five dogs. In two dogs, leptospiruria resolved after a change in therapy to enrofloxacin. In three dogs, doxycycline and/or enrofloxacin were ineffective at eliminating leptospiruria, which then resolved after therapy with clarithromycin. Pet owners could be at risk as persistent leptospiruria poses a potential zoonotic risk. The potential reasons for persistent leptospiruria as demonstrated by polymerase chain reaction testing are discussed.
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Affiliation(s)
- Tara Mauro
- From the Department of Small Animal Internal Medicine, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Kenneth Harkin
- From the Department of Small Animal Internal Medicine, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
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13
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Efficient Production of Murine Uterine Damage Model. Tissue Eng Regen Med 2018; 16:119-129. [PMID: 30989039 DOI: 10.1007/s13770-018-0149-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 07/13/2018] [Accepted: 07/23/2018] [Indexed: 01/30/2023] Open
Abstract
Background Thin or damaged endometrium causes uterine factor-derived infertility resulting in a failure of embryonic implantation. Regeneration of endometrium is a major issue in gynecology and reproductive medicine. Various types of cells and scaffolds were studied to establish an effective therapeutic strategy. For this type of investigations, production of optimal animal models is indispensable. In this study, we tried to establish various murine uterine damage models and compared their features. Methods Three to ten-week-old C57BL/6 female mice were anesthetized using isoflurane. Chemical and mechanical methods using ethanol (EtOH) at 70 or 100% and copper scraper were compared to determine the most efficient condition. Damage of uterine tissue was induced either by vaginal or dorsal surgical approach. After 7-10 days, gross and microscopic morphology, safety and efficiency were compared among the groups. Results Both chemical and mechanical methods resulted in thinner endometrium and reduced number of glands. Gross morphology assessment revealed that the damaged regions of uteri showed various shapes including shrinkage or cystic dilatation of uterine horns. The duration of anesthesia significantly affected recovery after procedure. Uterine damage was most effectively induced by dorsal approach using 100% EtOH treatment compared to mechanical methods. Conclusion Taken together, murine uterine damage models were most successfully established by chemical treatment. This production protocols could be applied further to larger animals such as non-human primate.
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Cao Y, Xie X, Zhang W, Wu D, Tu C. Low-dose Norfloxacin-treated leptospires induce less IL-1β release in J774A.1 cells following discrepant leptospiral gene expression. Microb Pathog 2018; 119:125-130. [DOI: 10.1016/j.micpath.2018.03.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 03/16/2018] [Accepted: 03/19/2018] [Indexed: 02/07/2023]
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15
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Zhang W, Xie X, Wu D, Jin X, Liu R, Hu X, Fu Y, Ding Z, Zhang N, Cao Y. Doxycycline Attenuates Leptospira-Induced IL-1β by Suppressing NLRP3 Inflammasome Priming. Front Immunol 2017; 8:857. [PMID: 28791016 PMCID: PMC5522854 DOI: 10.3389/fimmu.2017.00857] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 07/07/2017] [Indexed: 12/30/2022] Open
Abstract
Doxycycline (Dox), a semisynthetic antibiotic, has been reported to exert multiple immunomodulatory effects. Treatment with Dox has a satisfactory curative effect against leptospirosis. In addition to its antibacterial action, we supposed that Dox also modulated immune response in controlling leptospira infection. Using J774A.1 mouse macrophages, the effects of Dox on protein and mRNA levels of IL-1β and TNF-α were investigated after infection with live or sonicated Leptospira interrogans serovar Lai strain Lai (56601). Specifically, the level of IL-1β but not TNF-α was sharply decreased when treated with Dox in leptospira-infected macrophages. Western blot analysis showed that Dox suppressed the activation of leptospira-induced MAPK and NF-κB signaling pathways. Using NLRP3-deficient and NLRC4-deficient mice, the data showed that the expression of leptospira-induced IL-1β was mainly dependent on the presence of NLRP3 inflammasome in macrophages. Meanwhile, Dox suppressed leptospira-induced NLRP3 inflammasome priming with the upregulation of the Na/K-ATPase Pump β1 subunit. The inhibition effect of Dox on IL-1β was also conspicuous in cells with lipopolysaccharide and ATP stimulation. These results were confirmed in vivo, as peritoneal fluids of mice and organs of hamsters expressed less IL-1β after treatment of leptospiral infection with Dox. Our results indicated that Dox also modulated immune response to attenuate leptospira-induced IL-1β by suppressing p38, JNK, p65, and NLRP3 inflammasome priming.
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Affiliation(s)
- Wenlong Zhang
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.,Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xufeng Xie
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.,Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Dianjun Wu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xuemin Jin
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.,Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Runxia Liu
- South Dakota State University, Brookings, SD, United States
| | - Xiaoyu Hu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yunhe Fu
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Zhuang Ding
- Department of Infectious Disease, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Naisheng Zhang
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yongguo Cao
- Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.,Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Jilin University, Changchun, China
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Jin X, Zhang W, Ding Z, Wang H, Wu D, Xie X, Lin T, Fu Y, Zhang N, Cao Y. Efficacy of the Rabbit Polyclonal Anti-leptospira Antibody against Homotype or Heterotype Leptospira Infection in Hamster. PLoS Negl Trop Dis 2016; 10:e0005191. [PMID: 28027297 PMCID: PMC5189943 DOI: 10.1371/journal.pntd.0005191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 11/17/2016] [Indexed: 01/09/2023] Open
Abstract
Leptospirosis, caused by Leptospira, is one of the most important of neglected emerging zoonotic diseases that has important impacts on public health worldwide. Polyclonal antibody (pcAb) therapy is a potential method to process a series of pathogens for which there are limited determination of treatment, such as leptospirosis. First, we evaluated the efficacy of pcAb, derived from the sera of rabbits inoculated with Leptospira, against homotype (Leptospira interrogans serovar Lai) or heterotype (Leptospira interrogans serovar Autumnalis) Leptospira infection in a lethal hamster model. The pcAb treatment improved survival compared to the controls. The histopathology's of the infected kidney, liver and lung were also examined by hematoxylin and eosin staining. Using real-time quantitative PCR, we determined that most of the leptospires in the primary organs were almost completely removed by pcAb. In the second experiment, treatments, including antibiotic, pcAb, and combination, were started immediately after occurrence of the first serious sickness mouse in any group. No significant difference in survival rate between pcAb group and antibiotic group was found, but the combination therapy group significantly improved survival rate compared to the others (P<0.05). We conclude that the rabbit pcAb treatment may cure both the homotype and the heterotype lethal Leptospira infections in hamster, and combination therapy improved survival compared to antibiotic group in the late treatment of homotype leptospirosis.
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Affiliation(s)
- Xuemin Jin
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Wenlong Zhang
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Zhuang Ding
- Department of Infectious Disease, College of Veterinary Medicine, Jilin University, Changchun, People’s Republic of China, China
| | - Hai Wang
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, People's Republic of China, China
| | - Dianjun Wu
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Xufeng Xie
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Tao Lin
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD, United States
| | - Yunhe Fu
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Naisheng Zhang
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
| | - Yongguo Cao
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
- Key Laboratory for Zoonosis Research, College of Veterinary Medicine, Jilin University, Changchun, People's Republic of China, China
- * E-mail:
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17
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Wu D, Zhang W, Wang T, Lin T, Jin X, Xie X, Guo J, Cao Y, Wu R. Low-dose norfloxacin and ciprofloxacin therapy worsen leptospirosis in hamster. Microb Pathog 2016; 102:36-41. [PMID: 27894961 DOI: 10.1016/j.micpath.2016.11.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 11/19/2016] [Accepted: 11/21/2016] [Indexed: 12/11/2022]
Abstract
Antibiotics play an important role in the treatment of leptospirosis. Many antibiotics at appropriate concentrations improved the survival rate and alleviated tissue injury, while, when dosing strategies fall below subtherapeutic levels, worse therapeutic effects are seen. In the present study, we investigated the efficacy of low-dose norfloxacin (10, 20 and 30 mg/kg) and ciprofloxacin (1, 2 and 5 mg/kg) against leptospirosis in a hamster model using Leptospira interrogans serovar Icterohaemorrhagiae. The histopathology and bacterial loads of target organs (liver, kidney and lung) were also studied by treatment with norfloxacin at the dose of 10 mg/kg in this model. Using RT-PCR, the expression of inflammatory factor IL-1β and TNF-α was analyzed by comparing the norfloxacin and untreated group. All untreated animals, serving as a negative control, displayed 50% survival rate, while hamsters treated with norfloxacin at the dose of 10 and 20 mg/kg and ciprofloxacin at the dose of 1 and 2 mg/kg showed a lower survival rate than the untreated group. Furthermore, norfloxacin at the dose of 10 mg/kg increased bacterial loads and aggravated tissue injury of target organs. The delayed induction of IL-1β and TNF-α was found in tissues of norfloxacin group. Our study indicates an increased risk associated with low-dose norfloxacin and ciprofloxacin in leptospirosis.
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Affiliation(s)
- Dianjun Wu
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, People's Republic of China; Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Wenlong Zhang
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Tingting Wang
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Tao Lin
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD 57007, United States
| | - Xuemin Jin
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Xufeng Xie
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Jian Guo
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China
| | - Yongguo Cao
- Department of Clinical Science, College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130062, People's Republic of China.
| | - Rui Wu
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, People's Republic of China.
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Toll-Like Receptor 2 Agonist Pam3CSK4 Alleviates the Pathology of Leptospirosis in Hamster. Infect Immun 2016; 84:3350-3357. [PMID: 27620721 DOI: 10.1128/iai.00708-16] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 09/02/2016] [Indexed: 02/07/2023] Open
Abstract
Leptospirosis, caused by pathogenic spirochetes, is a zoonotic disease of global importance. The detailed pathogenesis of leptospirosis is still unclear, which limits the ideal treatment of leptospirosis. In this study, we analyzed the expression of Toll-like receptor 2 (TLR2) and TLR4 in target organs of both resistant mice and susceptible hamsters after Leptospira interrogans serovar Autumnalis infection. TLR2 but not TLR4 transcripts in mouse organs contrasted with delayed induction and overexpression in hamster organs. Coinjection of leptospires and the TLR2 agonist Pam3CSK4 into hamsters improved their survival rate, alleviated tissue injury, and decreased the abundance of leptospires in target organs. The production of interleukin-10 (IL-10) from tissues was enhanced in hamsters of the group coinjected with leptospires and Pam3CSK4 compared with the leptospira-injected group. Similarly, IL-10 levels in TLR2-deficient mice were lower than those in wild-type mice. A high ratio of IL-10/tumor necrosis factor alpha (TNF-α) levels was found in both infected wild-type mice and hamsters coinjected with leptospires and Pam3CSK4. Moreover, TLR2-dependent IL-10 expression was detected in peritoneal macrophages after leptospira infection. Our data demonstrate that coinjection of leptospires and Pam3CSK4 alleviates the pathology of leptospirosis in hamsters; this effect may result from the enhanced expression of TLR2-dependent IL-10.
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