The relationship between lower urinary tract symptoms and urinary dysbacteria in a rat model of water-avoidance stress / 中华泌尿外科杂志

ABSTRACT

Objective To explore the relationships among the central nervous system,the lower urinary tract and urinary microbiome by a rat model of stress-induced voiding dysfunction.Methods Rats were randomly assigned to stress group (exposure to water-avoidance stress for 10 days),stress-withdrawal group (exposure to the stress and then withdrawal for 2 weeks) or control group.On day 11 for stress and control groups or 2 weeks after day 11 for stress-withdrawal group,the Light-dark box transition test,lower abdominal pain threshold,micturition frequency and cystometry measurements were determined.Urine specimens were collected and processed for 16S rDNA gene sequencing.Results Compared to control group,the water-avoidance stress dramatically decreased in the time spent in the light area (P ＜0.01) and decreased mechanical pain threshold in stress group,which were reversed in stress-withdrawal group.While there was no significant difference in the micturition frequency between the control and stress-withdrawal groups,the stress group (20.33 ± 3.77) showed significantly more micturition frequencies than control (8.14 ± 2.23) and stress-withdrawal group (9.67 ± 1.89) (P ＜ 0.01).The stress dramatically increased voiding contractions in both the stress (7.33 ± 1.79) and stress-withdrawal (4.83 ± 1.06) groups compared to control rats (2.71 ± 1.38) (P ＜ 0.05).However,the stress-withdrawal group showed less voiding contractions than the stress group (P =0.03).The bacteria diversity in stress group were dramatically higher than those of the other two groups (P ＜ 0.01).Almost all specimens of the control rats were dominated by Enterococcacae,whereas samples from the stress group contained more diverse bacteria.The diversity of microbiota in the stress-withdrawal group was between those of the other two groups.LEfSe identified genera differed significantly among groupsLactococcus and Proteus were significantly increased in in the stress-withdrawal group;Halomonas,Aggregatibacter,Haemophilus,Pseudomonas and Streptococcus were significantly higher in the stress group.Conclusions Water-avoidance stress experiments demonstrated the impact of stress on bladder function and urinary microbiome,which tended to be ameliorated after a two-week withdrawal from stress.Further research is needed to understand the connections between central nervous system,bladder and urinary microbiome.