Long-term ketamine abuse induces cystitis in rats by impairing the bladder epithelial barrier View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2014-11

AUTHORS

Di Gu, Jun Huang, Youle Yin, Zhengfei Shan, Shaobin Zheng, Peng Wu

ABSTRACT

Long-term ketamine abuse is known to affect the lower urinary tract and produce symptoms of cystitis. However, the pathophysiology and causative mechanism of the changes in bladder function remain unclear. The present study aimed to investigate the existence of ketamine-induced cystitis in a rat model and characterize the underlining mechanisms. Rats were assigned to blank control, normal saline (NS), low-dose ketamine (LK, 5 mg/kg), and high-dose ketamine (HK, 50 mg/kg) groups. The two experimental groups received ketamine hydrochloride daily for 16 weeks. All rats were housed individually for assessment of urinary frequency and urine volume. Urinary biomarkers were measured at different time points. Rat bladders were excised for histopathology, immunohistochemistry, and western blot analysis. Ketamine-treated rats had increased urinary frequency compared to NS-treated rats at Week 16. Urinary nitric oxide and antiproliferative factor levels were increased in ketamine-treated rats within the first 30 h after administration. After long-term ketamine administration, urinary glycoprotein GP51 and potassium levels were decreased in the HK and LK groups compared to the NS group. Ketamine-treated rats showed thickened bladder epithelial layer, increased expression of inducible nitric oxide synthase and occludin, and decreased expression of zonula occludens-1 in the bladder wall. Ketamine, or its urinary metabolites, disrupted the proliferation of bladder epithelial cells, resulting in defected bladder epithelial barrier. Subsequent leakage of urinary potassium causes a stress response in the bladder and provokes cystitis. More... »

PAGES

7313-7322

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11033-014-3616-5

DOI

http://dx.doi.org/10.1007/s11033-014-3616-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1014120753

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25091940


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52 schema:description Long-term ketamine abuse is known to affect the lower urinary tract and produce symptoms of cystitis. However, the pathophysiology and causative mechanism of the changes in bladder function remain unclear. The present study aimed to investigate the existence of ketamine-induced cystitis in a rat model and characterize the underlining mechanisms. Rats were assigned to blank control, normal saline (NS), low-dose ketamine (LK, 5 mg/kg), and high-dose ketamine (HK, 50 mg/kg) groups. The two experimental groups received ketamine hydrochloride daily for 16 weeks. All rats were housed individually for assessment of urinary frequency and urine volume. Urinary biomarkers were measured at different time points. Rat bladders were excised for histopathology, immunohistochemistry, and western blot analysis. Ketamine-treated rats had increased urinary frequency compared to NS-treated rats at Week 16. Urinary nitric oxide and antiproliferative factor levels were increased in ketamine-treated rats within the first 30 h after administration. After long-term ketamine administration, urinary glycoprotein GP51 and potassium levels were decreased in the HK and LK groups compared to the NS group. Ketamine-treated rats showed thickened bladder epithelial layer, increased expression of inducible nitric oxide synthase and occludin, and decreased expression of zonula occludens-1 in the bladder wall. Ketamine, or its urinary metabolites, disrupted the proliferation of bladder epithelial cells, resulting in defected bladder epithelial barrier. Subsequent leakage of urinary potassium causes a stress response in the bladder and provokes cystitis.
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