Abstract:
OBJECTIVE:• To determine (i) the presence of fatty acid amide hydrolase (FAAH) in the urinary bladder; (ii) whether or not endogenous fatty acid ethanolamides are synthesized by the bladder; (iii) the effects of FAAH inhibition on referred hyperalgesia associated with acute bladder inflammation in rats. MATERIALS AND METHODS:• Immunohistochemistry and immunoblotting were performed to detect FAAH in the bladder. Acrolein (1 mM, 400 µL) was instilled into bladders of female Wistar rats to induce cystitis. Referred mechanical hyperalgesia was assessed by application of Von Frey monofilaments to the hind paws. • Animals were killed 4, 24, 48 and 72 h after acrolein instillation, and the fatty acid ethanolamide content of bladders was measured using isotope-dilution liquid chromatography/mass spectrometry. • Other rats were treated with the FAAH inhibitor URB597 (0.3 mg/kg, i.p.) after the induction of cystitis, and the mechanical sensitivity of the hind paws was determined. RESULTS:• Immunohistochemistry and immunoblotting showed the presence of FAAH in the bladder, with greatest abundance in the urothelium. • Acrolein-induced cystitis increased fatty acid ethanolamide content (including anandamide) in the bladder in a time-dependent manner. Inhibition of FAAH diminished referred hyperalgesia associated with acute bladder inflammation. CONCLUSIONS:• The results obtained in the present study indicate that (i) FAAH is present in the urinary bladder; (ii) fatty acid ethanolamides are increased during bladder inflammation; (iii) inhibition of FAAH could be an effective therapeutic approach for the treatment of bladder pain. • These results raise the possibility that inhibitors of enzymes responsible for metabolism of fatty acid ethanolamides could inhibit pain associated with bladder inflammation.
journal_name
BJU Intjournal_title
BJU internationalauthors
Merriam FV,Wang ZY,Hillard CJ,Stuhr KL,Bjorling DEdoi
10.1111/j.1464-410X.2010.09583.xsubject
Has Abstractpub_date
2011-10-01 00:00:00pages
1145-9issue
7eissn
1464-4096issn
1464-410Xpii
BJU9583journal_volume
108pub_type
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