Although nicotinic acetylcholine receptors in both the central and peripheral nervous systems play a prominent role in the control of urinary bladder function, little is known regarding expression or function of nicotinic receptors in the bladder epithelium, or urothelium. changes in voiding parameters. Intravesical nicotine (50 nM, 1 M) increased the intercontraction interval. Intravesical choline (1C100 M) also affected bladder reflexes similarly, suggesting that 7 nicotinic receptors mediate this effect. Intravesical administration of hexamethonium (1C100 M) potentiated the nicotine-induced changes in bladder reflexes. Methyllycaconitine citrate, a specific 7-receptor antagonist, prevented nicotine-, choline-, and hexamethonium-induced bladder inhibition. These results are the first indication that stimulation of nonneuronal nicotinic receptors in the bladder can affect micturition. PCR Core Kit, using the optional Q-solution, sequence-specific primers designed for each Ezogabine inhibitor subunit, and annealing temperatures were determined by the sequence of the primers. Primers for PCR were as follows: 2 (forward) 5-CGAGTCGGGGAGTATGGTAA-3 (reverse) 5-AGGAAGTGGCTTCTCAGTCG-3; 3 (forward) 5-GTGAATTCAGCCGTGCAGACTCCA-3 (reverse) 5-ATA-AGCTTGGCAACGTACTTCCAATCATC-3; 4 (forward) 5-GTGAATTCCACAGGTCGTACACGGGTCG-3 (reverse) 5-ATAAGCTTGCGAGCCCGGCATCTTGAGT-3; 5 (forward) 5-AGTGGGCTGGACCTAAATCTCG-3 (reverse) 5-CAA-AAAGCCCTAAAGTCCCAATGA-3; 7 (forward) 5-GT-GAATTCAAGAGGCCCGGAGAGGACAA-3 (reverse) 5-AT-AAGCTTCGCCACATACGACCCCAGAG-3; 2 (forward) 5-GTGAATTCAGGGCGAGGCGGTTTTCTT-3 (reverse) 5-ATAAGCTTGCGTACGCCATCCACTGCT-3; 3 (forward) 5-GTGAATTCTGGGTGAAGAGGCTGTT-3 (reverse) 5-ATAAGCTTATCGCTGGCGGGAGTCTGTT-3; 4 (forward) 5-GTGAATTCCATGGCATCCTGGGTCAAG-3 (reverse) 5-ATAAGCTTCTGGGGAGGCCTGCTGTGT-3. PCR was performed using the GeneAmp Rabbit polyclonal to LEF1 9700 thermocycler from Applied Biosystems. PCR products were run on a 1.2% agarose gel using ethidium bromide to visualize bands. Results were analyzed using the Eagle Vision II digital imaging system (Stratagene). Positive results were sequenced using an ABI PRISM 3100 Automated Genetic Analyzer in the University of Pittsburgh DNA Sequencing Core Facility. Western blots Cultured urothelial cells produced for 3 days were lysed in RIPA buffer, and protein was collected by centrifugation (15 min at 13,000 rpm). Protein was quantified using a BCA Protein Assay Kit (Pierce). Fifty micrograms of total protein were loaded onto an 8C20% polyacrylamide gel (Gradipore) and run for 1 h at 150 V using the Mini-Protean System (Bio-Rad). Proteins were then transferred to PVDF membranes using the Transblot system (Bio-Rad) at 250 mA for 1 h. The membranes were then blocked using 5% nonfat milk in TBS-T buffer and incubated with the primary antibody (1:1,000 dilution) overnight at 4C. After being rinsed in TBS-T buffer Ezogabine inhibitor three times for 15 min each, the membranes were incubated with the appropriate horseradish peroxidase (HRP)-conjugated secondary antibody for 1 h at room heat with shaking. Following additional washes (3 15 min), the membrane was developed using the ECL plus system (Immersion) and exposed to film to visualize banding. All antibodies and blocking peptides were purchased from Santa Cruz Biotechnology (goat polyclonal 3: sc-1771, goat polyclonal 7: sc-1447, bovine anti-goat-HRP sc-2350). Calcium imaging (Fura-2) Urothelial cells were maintained in vitro in Krebs answer and placed in a flow chamber. Cells were loaded with fura 2-AM (1 M dye, 40-min incubation at 25C), alternatively illuminated at 340 and 380 Ezogabine inhibitor nm by using a xenon lamp and imaged with a Dage-MTI cooled CCD camera with 640 480-pixel resolution. A Dage-MTI Gen. II system image intensifier and software package from Compix (Cranberry, PA) was used to collect data over a time span of ~10 min for each experiment, with no cell being exposed to light for longer than 30 min to minimize the effect of photobleaching. Rat in vivo bladder cystometrogram Female SD rats (250C275 g) were anesthetized with urethane (1.2 g/kg sc). A midline incision was made, and a catheter (intramedic tubing, PE 50) was inserted into the bladder lumen through a small incision in the bladder dome Ezogabine inhibitor and secured with a suture. The catheter was connected by way of a three-way stopcock to a syringe pump for fluid infusion and a pressure transducer was connected to a computer to record changes in bladder pressure. The ureters were also tied and cut to prevent filling of the bladder from the kidneys. A wick of sterile gauze was inserted into the midline incision and sewn in place to drain urine from the abdominal cavity. Saline was infused intravesically (0.04 ml/min) for 1 h to allow the bladder to recover from surgery. Saline infusion continued for an additional hour while bladder pressure was recorded to obtain control data. The bladder infusate was then switched to a drug solution and recorded for at least another hour before the switch to another drug answer. In four.