scholarly journals A mouse model displays host and bacterial strain differences in Aerococcus urinae urinary tract infection

Biology Open ◽  
2021 ◽  
Vol 10 (8) ◽  
Author(s):  
Nicole M. Gilbert ◽  
Brian Choi ◽  
Jingjie Du ◽  
Christina Collins ◽  
Amanda L. Lewis ◽  
...  
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Kidney Tissue ◽  
Strain Differences ◽  
Future Research ◽  
Acute Cystitis ◽  
Aerococcus Urinae ◽  
Infection And Inflammation ◽  
Host Genetic

ABSTRACT In recent years, the clinical significance of Aerococcus urinae has been increasingly recognized. A. urinae has been implicated in cases of urinary tract infection (UTI; acute cystitis and pyelonephritis) in both male and female patients, ranging from children to older adults. Aerococcus urinae can also be invasive, causing urosepsis, endocarditis, and musculoskeletal infections. Mechanisms of pathogenesis in A. urinae infections are poorly understood, largely due to the lack of an animal model system. In response to this gap, we developed a model of A. urinae urinary tract infection in mice. We compared A. urinae UTI in female C3H/HeN and C57BL/6 mice and compared four clinical isolates of A. urinae isolated from patients with UTI, urgency urinary incontinence, and overactive bladder. Our data demonstrate that host genetic background modulates A. urinae UTI. Female C57BL/6 female mice rapidly cleared the infection. Female C3H/HeN mice, which have inherent vesicoureteral reflux that flushes urine from the bladder up into the kidneys, were susceptible to prolonged bacteriuria. This result is consistent with the fact that A. urinae infections most frequently occur in patients with underlying urinary tract abnormalities or disorders that make them susceptible to bacterial infection. Unlike uropathogens such as E. coli, which cause infection and inflammation both of the bladder and kidneys in C3H/HeN mice, A. urinae displayed tropism for the kidney, persisting in kidney tissue even after clearance of bacteria from the bladder. Aerococcus urinae strains from different genetic clades displayed varying propensities to cause persistent kidney infection. Aerococcus urinae infected kidneys displayed histological inflammation, neutrophil recruitment and increased pro-inflammatory cytokines. These results set the stage for future research that interrogates host-pathogen interactions between A. urinae and the urinary tract.

scholarly journals UJI DIAGNOSTIK UJI DIAGNOSTIK PEMERIKSAAN NITRIT DENGAN KULTUR URIN PADA SUSPEK INFEKSI SALURAN KEMIH

2021 ◽  
Vol 9 (2) ◽  
pp. 131-137
Author(s):  
Putra Rahmadea Utami
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Urinary Tract Infections ◽  
Urine Culture ◽  
Kidney Tissue ◽  
High Specificity ◽  
Cross Sectional ◽  
Negative Results ◽  
Tract Infections

 Urinary tract infection (UTI) is the second largest infection after respiratory infection and can cause sepsis. Urinary tract infections occur due to the entry of microorganisms in the urinary tract. The urinary tract that is usually infected is the urethra (urethritis), bladder (cystisis), ureter (ureteristis), kidney tissue (pyelonephritis). This study aims to determine the sensitivity and specificity of the diagnostic test of nitrite examination with urine culture in suspected urinary tract infections. The method of this study is a descriptive-analytical study with a cross-sectional retrospective approach, conducted in the STIKes field laboratory with the population studied in this study were all patients diagnosed with urinary tract infection with a sample size of 50 samples. The results of this study showed positive nitrite results as many as 17 people, 34% percentage, and negative nitrite results as many as 33 people with a percentage of 66% and on urine culture examination obtained positive results as many as 17 people with a percentage of 34%, which results in growth of bacterial colonies on cultures> 100,000 CFU / mL and negative results of 33 people with a percentage of 66%. Sensitivity Results 82%, Specificity 90.9%. The conclusion of this study is the value of sensitivity, high specificity so that the nitrite test with urine culture can be applied to help diagnose UTI.

scholarly journals Urosepsis with Aerococcus urinae in a Patient with Complicated Urinary Tract Infection

2016 ◽  
Vol 91 (2) ◽  
pp. 229-232
Author(s):  
Chang Min Heo ◽  
Kyeong Min Jo ◽  
Ji Hoon Jang ◽  
Yoo Jin Lee ◽  
Bong Soo Park ◽  
...  
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Complicated Urinary Tract Infection ◽  
Aerococcus Urinae

scholarly journals A Putative Role of Apolipoprotein L1 Polymorphism in Renal Parenchymal Scarring Following Febrile Urinary Tract Infection in Nigerian Under-Five Children: Proposal for a Case-Control Association Study (Preprint)

2017 ◽  
Author(s):  
Emmanuel Ademola Anigilaje
Keyword(s):  
Urinary Tract Infection ◽  
Urinary Tract ◽  
Tract Infection ◽  
Kidney Tissue ◽  
Black Children ◽  
Case Control ◽  
White Children ◽  
Febrile Uti ◽  
Control Association ◽  
Apolipoprotein L1

BACKGROUND Although urinary tract infection (UTI) resolves with prompt treatment in a majority of children, some children, especially those aged less than 5 years, also develop renal parenchymal scarring (RPS). RPS causes high blood pressure that may lead to severe chronic kidney disease and end-stage renal disease (ESRD). Although the risk of UTI is higher in white children than in black children, it is unknown whether RPS is more common in white children than in black children as data are scarce in this regard. A common genetic predisposition to kidney disease in African Americans and the sub-Saharan African blacks is the possession of apolipoprotein L1 (APOL1). APOL1 risk variants regulate the production of APOL1. APOL1 circulates in the blood, and it is also found in the kidney tissue. While circulating, APOL1 kills the trypanosome parasites; an increased APOL1 in kidney tissues, under the right environmental conditions, can also result in the death of kidney tissue (vascular endothelium, the podocytes, proximal tubules, and arterial cells), which, ultimately, is replaced by fibrous tissue. APOL1 may influence the development of RPS, as evidence affirms that its expression is increased in kidney tissue following UTI caused by bacteria. Thus, UTI may be a putative environmental risk factor responsible for APOL1-induced kidney injury. OBJECTIVE The aim of this proposal was to outline a study that seeks to determine if the possession of two copies of either G1 or G2 APOL1 variant increases the risk of having RPS, 6 months following a febrile UTI among Nigerian under-five children. METHODS This case-control association study seeks to determine whether the risk of RPS from febrile UTI is conditional on having 2 APOL1 risk alleles (either G1 or G2). Cases will be children with a confirmed RPS following a febrile UTI. Controls will be age-, gender-, and ethnic-matched children with a febrile UTI but without RPS. Children with vesicoureteral reflux and other congenital anomalies of the urinary tract are to be excluded. Association between predictor variables (ethnicity, APOL1 G1 or G2, and others) and RPS will be tested at bivariate logistic regression analyses. Predictors that attained significance at a P value of ˂.05 will be considered for multiple logistic regressions. Likelihood-based tests will be used for hypothesis testing. Estimation will be done for the effect size for each of the APOL1 haplotypes using a generalized linear model. RESULTS The study is expected to last for 3 years. CONCLUSIONS The study is contingent on having a platform for undergoing a research-based PhD program in any willing university in Europe or elsewhere. The findings of this study will be used to improve the care of African children who may develop RPS following febrile UTI. REGISTERED REPORT IDENTIFIER RR1-10.2196/9514

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