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Propolis and Cranberries Prevent Recurrent Urinary Tract Infections

Propolis proves its worth, once  again as an ideal complementary therapy against resistant strains of bacteria. With the restorative effectiveness of Propolis in the mucous linings of the body and coupled with Cranberry PACs, this study also reveals how Propolis enhances the effects of other treatment protocols.

Propolis Can Potentialise the Anti-Adhesion Activity of proanthocyanidins on Uropathogenic Escherichia coli in the Prevention of Recurrent Urinary Tract Infections

BMC Research Notes, 2011, Nov 29

Background:
Escherichia coli, the main bacteria found in recurrent urinary tract infections (UTI), is now frequently resistant to several currently used antibiotic treatments making new solutions essential. In this study, we evaluated the association of propolis and proanthocyanidins type A to reduce bacterial anti-adhesion activity of E. coli on urothelial cells.

Results:
This first double-blind, randomized, cross-over human trial included 5 volunteers that followed 6 different regimens with or without variable doses of cranberry and propolis with a washout period of at least 1 week between each regimen. Urine samples were collected at 0 h, 4-6 h, 12 h and 24 h after cranberry plus propolis or placebo capsule consumption. In vivo urinary bacterial anti-adhesion activity was assessed with a bioassay (a human T24 epithelial cell-line assay) and an in vivo Caenorhabditis elegans model. HPLC-PDA-MS was used to detect propolis and cranberry compounds in urine.

Bioassays indicated significant bacterial anti-adhesion activity in urine collected from volunteers who had consumed cranberry plus propolis powder compared to placebo (p < 0.001). This inhibition was clearly dose-dependent, increasing with the amount of PACs and propolis equivalents consumed in each regimen.

Results suggested that propolis had an additional effect with PACs and prevent a bacterial anti-adhesion effect over 1 day. An in vivo model showed that the E. coli strain presented a reduced ability to kill C. elegans after their growth in urine samples of patients who took cranberry plus propolis capsules. HPLC confirmed that propolis is excreted in urine.

Conclusions:
This study presents an alternative to prevent recurrent UTI. Administration of PACs plus propolis once daily offers some protection against bacterial adhesion, bacterial multiplication and virulence in the urinary tract, representing an interesting new strategy to prevent recurrent UTI.
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