Abstract | OBJECTIVE: MATERIALS AND METHODS: Bladders of normal C57BL/6, and C57BL/6- derived CRH-R1, CRH-R2 or double CRH-R1 + 2 knockout (-/-) female mice (10-12 weeks old) were catheterized under anaesthesia. After emptying the urine, normal saline was instilled with or without intravesical CRH-R antagonists in C57BL/6 mice before they were stressed by placing them in a restrainer for 30 min. Evans blue was injected in the tail vein before stress for the permeability experiments. The bladders from C57BL/6 or CRH-R -/- mice were then removed, minced into 1 mm(2) pieces and cultured overnight. Culture media were collected 24 h later for VEGF assay. C57BL/6 bladder was processed for CRH-R immunohistochemistry. RESULTS: Acute stress increased bladder vascular permeability in control C57BL/6 and CRH-R1 -/- mice, but not CRH-R2 -/- or CRH-R1+2 -/- mice. The CRH-R2 antagonist Astressin 2B, but not the CRH-R1 antagonist Antalarmin, inhibited stress-induced VEGF release from C57BL/6 mouse bladder explants. Stress could not induce a VEGF increase from bladder explants of CRH-R2 -/- or CRH-R1+2 -/- mice, but did so in CRH-R1 -/- mice. Bladder CRH-R2 immunoreactivity was detected in C57BL/6 bladders. CONCLUSIONS: Acute stress induces bladder vascular permeability and VEGF release that is dependent on CRH-R2. These findings suggest that CRH and VEGF might participate in the pathogenesis of IC/PBlS and provide for new therapeutic targets.
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Authors | William Boucher, Duraisamy Kempuraj, Margaret Michaelian, Theoharis C Theoharides |
Journal | BJU international
(BJU Int)
Vol. 106
Issue 9
Pg. 1394-9
(Nov 2010)
ISSN: 1464-410X [Electronic] England |
PMID | 20201838
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Copyright | © 2010 THE AUTHORS. JOURNAL COMPILATION © 2010 BJU INTERNATIONAL. |
Chemical References |
- CRF receptor type 2
- Receptors, Corticotropin-Releasing Hormone
- Vascular Endothelial Growth Factor A
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Topics |
- Acute Disease
- Animals
- Capillary Permeability
(physiology)
- Cystitis, Interstitial
(etiology, physiopathology)
- Female
- Immunohistochemistry
- Mast Cells
(metabolism)
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Receptors, Corticotropin-Releasing Hormone
(metabolism)
- Stress, Psychological
(complications, physiopathology)
- Vascular Endothelial Growth Factor A
(metabolism)
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