• Publikační typ
• abstrakt z konference MeSH

• Publikační typ
• abstrakt z konference MeSH

Both divisions of the autonomic nervous system are involved in regulation of urinary bladder function. Several substances, other than noradrenaline and acetylcholine, seem to play important roles in physiology and pathophysiology of lower urinary tract. In the current study, we aimed to examine if there exist interplays between nitric oxide (NO) and autonomic transmitters and if such interactions vary in different parts of the urinary bladder in healthy and cyclophosphamide (CYP)-induced cystitic rats; when administered to the animals (100 mg/kg; i.p.), the cytotoxic CYP metabolite acrolein induces bladder inflammation. In the current study a series of in vitro functional studies were performed on detrusor muscle strip preparations. Stimulation with electrical field stimulation (EFS), methacholine, adenosine 5´-triphosphate (ATP), and adrenaline evoked contractile responses in isolated bladder preparations that were significantly reduced in cyclophosphamide (CYP)-treated rats. While the nitric oxide synthase inhibitor N(omega)-nitro-L-arginine (L-NNA; 10(-4) M) did not affect contractile responses in normal, healthy strip preparations, it significantly increased the contractile responses to EFS, methacholine and adrenaline, but not to ATP, in the bladders from the CYP-treated rats. In the CYP-treated rats, the ATP-evoked relaxatory part of its dual response (an initial contraction followed by a relaxation) was 6-fold increased in comparison with that of normal preparations, whereas the isoprenaline relaxation was halved in the CYP-treated. While L-NNA (10(-4) M) had no effect on the isoprenaline-evoked relaxations, it reduced the ATP-evoked relaxations in strip preparations from the bladder body of CYP-treated rats. Stimulation of beta(2)- and beta(3)-adrenoceptors evoked relaxations and both responses were reduced in cystitis, the latter to a larger extent. In the trigone, the reduced ATP-evoked contractile response in the inflamed strips was increased by L-NNA, while L-NNA had no effect on the ATP-evoked relaxations, neither on the relaxations in healthy nor on the larger relaxations in the inflamed trigone. The study shows that both contractile and relaxatory functions are altered in the state of inflammation. The parasympathetic nerve-mediated contractions of the body of the bladder, evoked by the release of ATP and acetylcholine, were substantially reduced in cystitis. The relaxations to beta-adrenoceptor and purinoceptor stimulation were also reduced but only the ATP-evoked relaxation involved NO.

• MeSH
• adenosintrifosfát metabolismus   MeSH
• adrenergní receptory metabolismus   MeSH
• cyklofosfamid farmakologie   MeSH
• cystitida metabolismus   patofyziologie   MeSH
• hladké svalstvo účinky léků   metabolismus   patofyziologie   MeSH
• krysa rodu rattus MeSH
• močový měchýř metabolismus   patofyziologie   MeSH
• oxid dusnatý metabolismus   farmakologie   MeSH
• potkani Sprague-Dawley MeSH
• purinergní receptory metabolismus   MeSH
• svalová kontrakce účinky léků   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Regulation of bladder function involves both divisions of the autonomic nervous system. However, in addition to the classical autonomic transmitters, noradrenaline and acetylcholine, other autonomic transmitters and other signalling components play important roles in physiology and pathophysiology of the lower urinary tract. Several substances of neuronal non-adrenergic, non-cholinergic (NANC) systems have already proven to considerably influence functional responses in the inflamed urinary bladder. Interstitial cystitis (IC) or painful bladder syndrome (PBS) is a chronic inflammatory bladder disease, characterized by urinary frequency, urgency and pelvic pain. IC/PBS is difficult to diagnose, especially because the etiology of the condition is largely unknown. Despite the unclear nature of the cause and manifestation of IC/PBS, it has been shown that the disease involves a significant NANC component. Here, we review the possible roles of ATP, adenosine, nitric oxide, vasoactive intestinal polypeptide, substance P, and pituitary adenylate cyclase-activating peptide in the contribution to IC/PBS development and manifestation of IC/PBS symptoms.

• MeSH
• intersticiální cystitida farmakoterapie   metabolismus   patologie   MeSH
• lidé MeSH
• močové ústrojí účinky léků   inervace   metabolismus   MeSH
• močový měchýř účinky léků   inervace   metabolismus   MeSH
• neurony adrenergní účinky léků   MeSH
• neurony cholinergní účinky léků   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH