Acetylcholine ; metabolism ; physiology ; Animals ; Cholinergic Agonists ; pharmacology ; Male ; Muscle Contraction ; drug effects ; physiology ; Muscle Relaxation ; drug effects ; physiology ; Muscle, Smooth ; drug effects ; pathology ; physiopathology ; Rabbits ; Random Allocation ; Receptors, Cholinergic ; physiology ; Synaptic Transmission ; drug effects ; Urinary Bladder ; drug effects ; innervation ; physiopathology

Current and primary treatment modality in overactive bladder includes the administration of anticholinergics. The demand for new agents has been rising since anticholinergics have proven to come with many side effects. This study was designed to investigate the effects of ylang-ylang essential oil (YYEO) on the relaxation of urinary bladder muscle in vitro and in vivo. Effects of YYEO were assessed on resting tension, and electrical field stimulation- and various drug-induced contraction in vitro by checking the isometric tension changes of muscle strips and same procedures were repeated in the presence of methylene blue, Nw-Nitro-L-arginine methyl ester hydrochloride (L-NAME), or N-ethylmaleimide, and in vivo. YYEO decreased significantly the contractility of strips. There was no statistically significant difference between the treated group only with YYEO and the pretreated group with YYEO and methylene blue or L-NAME. When N-ethylmaleimide was employed, there was a statistically significant decrease in the rate of contraction. In vivo studies showed the same results compared with in vitro study. The results of this study indicate that YYEO has a relaxing effect on the bladder, and such mechanism is thought to be brought about by a pathway mediated by c-AMP.
Animals ; *Annonaceae ; Bladder/*drug effects/physiology ; Bladder, Neurogenic/drug therapy ; Blood Pressure/drug effects ; In Vitro ; Male ; Muscle Contraction/drug effects ; Muscle, Smooth/drug effects/physiology ; Oils, Volatile/*pharmacology ; Plant Preparations/*pharmacology ; Rabbits ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo observe the relaxant effect of Aike Mixture (AKM) on isolated bladder and prostatic urethral smooth muscle of rabbits.

METHODSThe isolated bladder and prostatic urethral smooth muscle from male rabbits were placed in a Magnus bath and smooth muscle contraction was measured using a biological signal acquisition and analysis system. The effects of AKM in combination with methoxyamine, carbachol and CaCl2 on the contractile tension of muscle strips were determined by cumulative dosing.

RESULTSAKM dose-dependently reduced contractile tension of bladder trigone smooth muscle (r=0.831, P<0.05), reduced contractile wave amplitude (r=0.837, P<0.05) and decreased contractile frequency (r=-0.917, P<0.01). AKM significantly inhibited the increases in smooth muscle contraction induced by methoxyamine, carbachol and CaCl2.

CONCLUSIONAKM dose-dependently inhibited the contraction of rabbit isolated bladder and prostatic urethral smooth muscle by antagonizing α1-adrenergic receptors and M-cholinergic receptors.

Animals ; Calcium Chloride ; pharmacology ; Carbachol ; pharmacology ; Drugs, Chinese Herbal ; pharmacology ; Hydroxylamines ; pharmacology ; In Vitro Techniques ; Male ; Muscle Contraction ; drug effects ; Muscle, Smooth ; drug effects ; physiology ; Neuromuscular Agents ; pharmacology ; Prostate ; drug effects ; physiology ; Rabbits ; Receptors, Adrenergic, alpha-1 ; metabolism ; Receptors, Muscarinic ; metabolism ; Urethra ; drug effects ; physiology ; Urinary Bladder ; drug effects ; physiology

This study was performed to investigate the action of potassium channel openers on the mechanical activity of detrusor muscle isolated from rats. Detrusor muscle strips, 15 mm in length, were myographied isometrically in an isolated organ bath. P 1060, RP 49356 and BRL 38277, potassium channel activators, reduced the basal tone and diminished the phasic activity of detrusor concentration-dependently. P 1060, RP 49356 and BRL 38227 suppressed the maximal responses to bethanechol and shifted the concentration-response curves of bethanechol-induced contraction to the right. RP 49356 and BRL 38227 reduced the contraction by low (20 mM) concentration of potassium. P 1060, however, diminished the high (80 mM) and low (20 mM) concentration of potassium-induced contraction. Glibenclamide, an inhibitor of ATP-dependent potassium channel, antagonized the suppressive action of P 1060, RP 49356 and BRL 38227 on the basal tone. Apamin or procaine did not antagonize it significantly. Based on these results, it is suggested that the relaxation of detrusor muscle strip caused by P 1060, RP 49356 and BRL 38227 may predominantly involve opening of the same potassium channel, i.e., the ATP-dependent potassium channel.
Animals ; Benzopyrans/*pharmacology ; Cromakalim ; Guanidines/*pharmacology ; Muscle Contraction/drug effects ; Muscle, Smooth/*drug effects ; Picolines/*pharmacology ; Potassium Channels/*drug effects ; Pyrans/*pharmacology ; Pyrroles/*pharmacology ; Rats ; Rats, Sprague-Dawley ; Urinary Bladder/*drug effects/physiology

OBJECTIVETo discuss the influence of Suoquan capsule (SQJN) on the detrusor of D-galactose mimetic rats, and to explore the mechanism of reducing urine.

METHODInvestigate the enzymes (ATPase, SDH, SOD, MDA, Na+ -K+ -ATPase, Ca2+ - Mg2+ -ATPase) which influence the production and excretion of urine and the reactivity of urinary detrusor strips to different concentrations of ISO and ATP.

RESULTCompared with the model group, the activity of SOD, Na+ -K+ -ATPase, Ca2+ -Mg2+ -ATPase and SDH increased significantly in aging rats after administrating SQJN (P < 0.01); the complaisance and elasticity of bladder also increased (P < 0.05). The frequency of spontaneous contraction and the MDA decreased significantly (P < 0.05-0.01). The decreased relaxation response to ISO and increased contractile response to ATP were also changed after administrating SQJN.

CONCLUSIONSQJN can regulate the metabolism of fluid through recovering the normal physiologic function of the detrusor of bladder.

Animals ; Disease Models, Animal ; Drugs, Chinese Herbal ; administration & dosage ; Female ; Galactose ; adverse effects ; Humans ; Male ; Muscle Contraction ; Muscle, Smooth ; physiology ; Rats ; Urinary Bladder ; drug effects ; metabolism ; physiopathology ; Urinary Incontinence, Urge ; chemically induced ; drug therapy ; metabolism ; physiopathology ; Urination ; drug effects

BACKGROUNDThe neurogenic bladder dysfunction caused by spinal cord injury is difficult to treat clinically. The aim of this research was to establish an artificial bladder reflex arc in rats through abdominal reflex pathway above the level of spinal cord injury, reinnervate the neurogenic bladder and restore bladder micturition.

METHODSThe outcome was achieved by intradural microanastomosis of the right T13 ventral root to S2 ventral root with autogenous nerve grafting, leaving the right T13 dorsal root intact. Long-term function of the reflex arc was assessed from nerve electrophysiological data and intravesical pressure tests during 8 months postoperation. Horseradish peroxidase (HRP) tracing was performed to observe the effectiveness of the artificial reflex.

RESULTSSingle stimulus (3 mA, 0.3 ms pulses, 20 Hz, 5-second duration) on the right T13 dorsal root resulted in evoked action potentials, raised intravesical pressures and bladder smooth muscle, compound action potential recorded from the right vesical plexus before and after the spinal cord transaction injury between L5 and S4 segmental in 12 Sprague-Dawley rats. There were HRP labelled cells in T13 ventral horn on the experimental side and in the intermediolateral nucleus on both sides of the L6-S4 segments after HRP injection. There was no HRP labelled cell in T13 ventral horn on the control side.

CONCLUSIONUsing the surviving somatic reflex above the level of spinal cord injury to reconstruct the bladder autonomous reflex arc by intradural microanastomosis of ventral root with a segment of autologous nerve grafting is practical in rats and may have clinical applications for humans.

Anastomosis, Surgical ; Animals ; Atropine ; pharmacology ; Male ; Models, Theoretical ; Rats ; Rats, Sprague-Dawley ; Reflex, Abdominal ; drug effects ; physiology ; Trimethaphan ; pharmacology ; Urinary Bladder, Neurogenic ; physiopathology

BACKGROUNDBladder cancer is a relatively common tumor in the urinary system, in which mitomycin C (MMC)-based chemotherapy or combination chemotherapy has been mainly used to treat patients with advanced bladder cancer. The prognosis of patients with advanced bladder cancer is still extremely poor in spite of recent therapeutic advances. To improve the prognosis, the sensitivity of tumor cells to mitomycin C by the induction of apoptosis with the abating heat shock protein 70 (HSP70) expression in human bladder cancer cell lines of BIU-87 was investigated.

METHODSHSP70 expression was abated in BIU-87 cells by HSP mRNA antisense oligomers. MTT assay and the clone-forming test were used for evaluating the sensitivity of cells to MMC. Apoptosis was assessed using both fluorescent microscopy after staining the cells with Hoechst 33258 and DNA fragment ladder agarose electrophoresis. Thirty-two male six-week-old BALB/c nude mice, at the beginning of the experiment, were used to evaluate the effect of antisense oligomers (ASO) on the tumor formation in vivo.

RESULTSHSP70 expression in BIU-87 was effectively abated by HSP70 mRNA antisense oligomers. The percentage of apoptotic cells in ASO group was greater than in sense oligomers (SO) [P < 0.05, (18.31 +/- 2.89)% vs (1.89 +/- 0.74)%], nonsense oligomers (NO) [P < 0.05, (18.31 +/- 2.89)% vs (1.78 +/- 0.92)%] and blank groups [P < 0.05, (18.31 +/- 2.89)% vs (1.87 +/- 0.84)%], while the sensitivity of tumor cells to mitomycin C was enhanced. The in vivo tumor inhibition rate of ASO plus MMC (> 50%) was more than that of ASO or MMC group alone (all P < 0.05).

CONCLUSIONSThe abating level of HSP70 expression can strengthen the sensitivity of BIU-87 to MMC. One of this effect might be related to the induction of apoptosis by abating HSP70 expression.

Apoptosis ; drug effects ; Cell Line, Tumor ; Gene Expression Regulation, Neoplastic ; drug effects ; HSP70 Heat-Shock Proteins ; antagonists & inhibitors ; genetics ; physiology ; Humans ; Mitomycin ; pharmacology ; Oligodeoxyribonucleotides, Antisense ; pharmacology ; RNA, Messenger ; analysis ; Urinary Bladder Neoplasms ; drug therapy ; metabolism ; pathology

Glucocorticoid receptor (GR) is identified as a member of nuclear receptor family. To exert its biological action, the ligand bound GR is translocated from the cytoplasm into the nucleus by regulating transcriptional signals of related genes. In clinical practice, the effects of glucocorticoid are often mediated by GR signaling pathways. An increasing number of studies have indicated that GR signaling pathways play an essential role in the proliferation, invasion and prognosis of bladder cancer. Meanwhile, the new-generation selective GR activator improves its anti-tumor effects, and at the same time reduces the adverse reactions of hormones, which probably raises the prospect for the treatment of bladder cancer.
Animals ; Antineoplastic Agents ; pharmacology ; Cell Nucleus ; genetics ; Humans ; Prognosis ; Protein Transport ; genetics ; Receptors, Glucocorticoid ; agonists ; physiology ; Signal Transduction ; genetics ; Transcriptional Activation ; drug effects ; physiology ; Urinary Bladder Neoplasms ; genetics ; physiopathology

OBJECTIVETo explore the role of autophagy in quercetin (Que)-induced apoptosis in human bladder carcinoma BIU-87 cells in vitro.

METHODSTo determine the proliferative inhibition by MTT colorimetric assay after treating BIU-87 cells with quercetin at various concentrations. To identify autophagy and apoptosis in the BIU-87 cells after Que treatment by monodansylcadaverin (MDC) and Hoechst 33258 fluorescent staining, respectively. To examine the cytotoxic effect of Que and influence of autophagy on apoptosis by studying LDH leakage rate and flow cytometry, after blocking the autophagy with 3-methlyadenine (3-MA), a specific autophagy inhibitor.

RESULTSThere was an obvious inhibitory effect of Que on the proliferation of BIU-87 cells in a time- and dose-dependent manner. The inhibition rate of BIU-87 cells after 200 µmol/L Que treatment for 72 hours was 89.2%. Autophagy and apoptosis were induced and detected in Que-treated BIU-87 cells and autophagy occurred earlier than apoptosis. The apoptosis peak became much higher after the autophagy was blocked. Whenever the autophagy was blocked before or after Que treatment, the Que-induced cytotoxicity in BIU-87 cells was enhanced.

CONCLUSIONSQuercetin significantly inhibits the proliferation of BIU-87 cells, and the autophagy is induced earlier than apoptosis. In the process of Que-induced apoptosis of BIU-87 cells, autophagy may play a protective role at the initiation phase, delay apoptosis and reduce the Que-induced death of BIU-87 cells.

Adenine ; analogs & derivatives ; pharmacology ; Antioxidants ; administration & dosage ; pharmacology ; Apoptosis ; drug effects ; Autophagy ; drug effects ; physiology ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Dose-Response Relationship, Drug ; Humans ; L-Lactate Dehydrogenase ; drug effects ; metabolism ; Quercetin ; administration & dosage ; pharmacology ; Urinary Bladder Neoplasms ; pathology

OBJECTIVETo evaluate the effect of combined use of oncolytic virus and the chemotherapeutic agents mitomycin (MMC) in growth inhibition of human bladder cancer cell line T-24 in vitro.

METHODSHuman bladder cancer cell line T-24 was infected with oncolytic virus (ONYX-015) of different multiplicity of infection, or treated with MMC in addition to ONYX-015. The changes in the cell growth, morphology, and apoptosis of cultured T-24 cells were observed by means of cell counting and fluorescence microscopy after the treatments. The effects of the treatment protocols were also tested in nude mouse model of implanted subcutaneous tumor.

RESULTSCombined use of ONYX-015 and MMC produced substantially stronger cytotoxic effect against T-24 cells than exclusive use of ONYX-015. In in vivo experiments, combination of oncolytic virus and MMC resulted in much more significant tumor growth inhibition than either of the agents used alone. Obvious T-24 cell apoptosis could be observed in response to combined ONYX-105 and MMC treatment and exclusive ONYX-105 treatment.

CONCLUSIONSONYX-015 combined with MMC can produce significant cytotoxicity against T-24 cells and enhance therapeutic efficacy against bladder carcinoma.

Animals ; Antibiotics, Antineoplastic ; pharmacology ; therapeutic use ; Apoptosis ; drug effects ; physiology ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Cell Survival ; drug effects ; Combined Modality Therapy ; Female ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Mitomycin ; pharmacology ; therapeutic use ; Oncolytic Virotherapy ; methods ; Oncolytic Viruses ; physiology ; Urinary Bladder Neoplasms ; pathology ; therapy ; virology ; Xenograft Model Antitumor Assays