2007 Fiscal Year Final Research Report Summary
Development of new therapy for bladder dysfunction:Combined approaches of phamiacology and tissue engineering
| Project/Area Number |
18591745
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Urology
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| Research Institution | Shinshu University |
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Principal Investigator |
IGAWA Yasuhiko Shinshu University, Dept. of Urology, Associate Professor (40159588)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIZUKA Osamu Sch. of Med, Dept. of Urology, Associate Professor (20184541)
SEKI Satoshi Sch. of Med, Dept, of Urological Research, Associate Professor (60293502)
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| Project Period (FY) |
2006 – 2007
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| Keywords | afferent nerves / bladder augmentation / bone marrow-derived cells / detrusor overactivity / human amniotic membrane / interstitial cystitis / pharmacology / tissue engineering |
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| Research Abstract |
1) The threshold measurement for intravesical urothelial electric stimulation with three different frequencies revealed that Patients with interstitial cystitis (IC) had significantly lower threshold for C-fiber afferents stimulation than those with benign prostatic hyperplasia.
2) The clinical and urodynamic effects of intravesical instillation of resiniferatoxin (RTX) were investigated in 5 patients with detrusor overactivity (DO) and 6 patients with interstitial cystitis (IC) resistant against standard conservative therapy. Four of 5 DO patients responded to the treatment within 1 week after the instillation, and the effect lasted for 3-9 months. Five of 6 IC patients showed improvement of their storage symptoms within 1 week after the treatment, and bladder pain score and mean voided volume were significantly improved. However, these effects disappeared within 1-2 months. No adverse events were reported.
3) In rats, intravesical ATP, an agonist for P2X3 receptors, decreased bladder c
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apacity and threshold pressure for voiding, which was associated with an increase in the afferent activity of RTX-resistant C-fibers of the primary bladder afferents. Theses results suggest that activation of P2X3 receptors facilitates RTX-resistant C-fibers in the rat bladder.
4) Bladder augmentation in rats using human amniotic membrane (hAM) revealed regeneration of urothelium, detrusor smooth muscle, and nerve fibers in the graft within 3 months postoperatively. The hAM-augmented bladders displayed adequate capacity and compliance, indicating that human amniotic membrane can be used as a scaffold for bladder augmentation. We have also found that in nude mice, bone marrow-derived cells, when implanted into freeze-injured urinary bladders, can differentiate into smooth muscle cells and reconstruct smooth muscle layers.
5) All together, the results of the present studies indicate that bladder dysfunction can be treated with various pharmacological agents targeting urothelial-afferent neurotransduction system of the bladder as well as tissue engineering techniques using human amniotic membrane and bone marrow-derived cells. Less
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[Journal Article] The nature of high-pressure voiding in small boys and its relation with the influence of a transurethral catheter2008
Author(s)
Ichino, M., Igawa, Y., Seki, S., Iijima, K., Ishizuka, O., Nishizawa, O
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Journal Title
Neurourol Urodyn 27
Pages: 319-323
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Implantation of mouse bone marrow cells reconstructs layered smooth muscle structures in injured urinary bladder2008
Author(s)
Imamura, T., Kinebuchi, Y., Ishizuka, O., Seki, S., Igawa, Y., Nishizawa, O
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Journal Title
Cell transplantation (in press)
Description
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[Journal Article] Transplantation of preserved human amniotic membrane for bladder augmentation in rats2007
Author(s)
Iijima, K., Igawa, Y., Imamura, T., Moriizumi, T., Nikaido, T., Konishi, I., Nishizawa, O
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Journal Title
Tissue Eng 13
Pages: 513-24
Description
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[Presentation] Intravesical high-dose resiniferatoxin for the treatment of interstitial cystitis2007
Author(s)
Igawa, Y., Seki, S., Ichino, M., Ishizuka, O., Takahashi, S., Tsukamoto, T., Nishizawa, O
Organizer
37th Annual meeting of International Continence Society
Place of Presentation
Rotterdam City
Year and Date
2007-08-20
Description
「研究成果報告書概要(欧文)」より
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