title: Further evidence of endogenous hydrogen sulphide as a mediator of relaxation in human and rat bladder.
abstract: We investigated the expression of hydrogen sulphide (H2S) in human and rat lower urinary tract (including bladder, prostate and urethra) tissues, and we sought to determine whether H2S induces relaxation of human and Sprague-Dawley (SD) rat bladder strips. Human normal lower urinary tract tissue was obtained for the evaluation of endogenous H2S productivity using a sulphide-sensitive electrode and for the analysis of the expression levels of all three synthases of endogenous H2S, cystathionine β-synthase (CBS), cystathionine γ lyase (CSE) and 3-mercaptopyruvate sulphur transferase (MPST, as known as 3-MST) by Western blot assay. CBS, CSE and MPST were located in human sample slides by immunohistochemistry. Human and male adult SD rat bladder strips were tested for H2S function with a transducer and recorded. All experiments were repeated six times. The endogenous H2S productivity and the H2S synthases had various distributions in the human and rat lower urinary tract tissues and were located in both epithelial and stromal sections. L-cysteine (L-Cys, a substrate of CBS, CSE and MPST) elicited relaxation in a dose-dependent manner on human bladder strips pre-contracted by acetylcholine chloride. This effect could be diminished by the ATP-sensitive potassium ion (KATP) channel blocker glibenclamide (GLB), the CSE inhibitor DL-propargylglycine (PPG) and the CBS inhibitor hydroxylamine (HA). H2S and its three synthases were present in the human and rat lower urinary tract tissues and relaxed human and rat bladder strips, which implied that endogenous H2S might play a role in physiological function and pathological disorders of the lower urinary tract symptoms (LUTS) or overactive bladder (OAB).
authors.affiliation: Department of Urology, Peking University First Hospital, Beijing, China.
authors.forename: Jun-Wei
authors.initials: JW
authors.lastname: Gai
authors.forename: Wasilijiang
authors.initials: W
authors.lastname: Wahafu
authors.forename: Hui
authors.initials: H
authors.lastname: Guo
authors.forename: Miao
authors.initials: M
authors.lastname: Liu
authors.forename: Xu-Chang
authors.initials: XC
authors.lastname: Wang
authors.forename: Yun-Xiang
authors.initials: YX
authors.lastname: Xiao
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Zhong-Cheng
authors.initials: ZC
authors.lastname: Xin
authors.forename: Jie
authors.initials: J
authors.lastname: Jin
mesh_terms: D000368:Aged; D000480:Alkynes / Q000494:pharmacology; D000818:Animals; D003541:Cystathionine beta-Synthase / Q000096:biosynthesis; D003542:Cystathionine gamma-Lyase / Q000096:biosynthesis; D003545:Cysteine / Q000494:pharmacology; D005905:Glyburide / Q000494:pharmacology; D005998:Glycine / Q000031:analogs & derivatives / Q000494:pharmacology; D006801:Humans; D006862:Hydrogen Sulfide / Q000378:metabolism*; D019811:Hydroxylamine / Q000494:pharmacology; D008297:Male; D008875:Middle Aged; D009126:Muscle Relaxation / Q000187:drug effects*; D011467:Prostate / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013466:Sulfurtransferases / Q000096:biosynthesis / Q000378:metabolism; D014521:Urethra / Q000378:metabolism; D001743:Urinary Bladder / Q000187:drug effects* / Q000502:physiology*
chemical_list: D000480:Alkynes; D019811:Hydroxylamine; C009055:propargylglycine; D013466:Sulfurtransferases; C021550:3-mercaptopyruvate sulphurtransferase; D003541:Cystathionine beta-Synthase; D003542:Cystathionine gamma-Lyase; D003545:Cysteine; D005905:Glyburide; D005998:Glycine; D006862:Hydrogen Sulfide