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Antibacterial activity of propolis against MRSA and synergism with topical mupirocin
Yusuf Onlen1, Nizami Duran, Esin Atik
1Department of Infectious Diseases and Clinical Microbiology, Mustafa Kemal University Faculty of Medicine, Hatay, Turkey.
Objectives:
The aim of the present study was to investigate the activity of the propolis and its combinations with mupirocin against methicillin-resistant Staphylococcus aureus (MRSA) in nasal carriage.
Methods:
This study was carried out between June and August 2005. To infect nares of the rabbits, MRSA (ATCC 33591) strain was used. Minimum inhibitory concentration was determined according to National Committee for Clinical Laboratory Standards. Each inoculum was prepared in the same medium at a density adjusted to a 0.5 McFarland turbidity standard (10(5) colony-forming units [cfu]/mL) and diluted 1:100 for the broth microdilution procedure. Ten microliters (10 microL) (10(5) cfu/mL) of the bacterial suspension containing approximately 1000 cfu of MRSA was administered with sterile microsyringe through both nostrils of each rabbit. Ninety-six (96) hours after inoculation, the presence of infection was confirmed by using bacterial cultures. Twenty-six young New Zealand rabbits were randomly divided into 4 groups. Each treatment group (1, 2, and 3) included 7 rabbits and control group (group 4) included 5 rabbits. Group 1 was treated with topical mupirocin + ethanolic extract of propolis drops, group 2 received topical mupirocin, group 3 was administered ethanolic extract of propolis drops, and the control group (group 4) was only treated with phosphate-buffered solution drops for 7 days. At the end of study, nasal cultures and smears were obtained for bacterial count and cytologic examination.
Results:
The colony numbers of bacteria in group 1 were determined to be significantly lower than in group 2 (p = 0.0001), group 3 (p = 0.0001), and group 4 (p = 0.0001). The mean bacterial cell counts of groups 1-4 were 360.2 +/- 52.4 cfu/mL, 4120.6 +/- 860.4 cfu/mL, 5980.8 +/- 1240.6 cfu/mL, and 11500.0 +/- 2568.4 cfu/mL, respectively. Mupirocin + propolis administration (group 1) resulted in a significant reduction in the polymorphonuclear leukocyte (PMNL) count in the mucous membranes of rabbits compared with the other treatment groups (p < 0.05).
Conclusions:
Propolis addition to mupirocin regimen was found to result in more profound reduction in bacterial cell count and inflammatory response compared with the rest of the treatment modalities.
Insights
Propolis combined with mupirocin significantly reduced methicillin-resistant Staphylococcus aureus (MRSA) nasal carriage in rabbits. This combination therapy also lowered inflammatory responses more effectively than either treatment alone.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in healthcare settings.
- Nasal carriage of MRSA is a major risk factor for invasive infections.
- Effective strategies to eradicate MRSA nasal carriage are crucial.
Purpose of the Study:
- To evaluate the efficacy of propolis and its combination with mupirocin against MRSA nasal carriage.
- To assess the impact of these treatments on inflammatory responses in rabbit nares.
Main Methods:
- A rabbit model was used to study MRSA nasal carriage.
- Animals were treated with topical mupirocin, ethanolic extract of propolis, or a combination.
- Bacterial counts and cytologic examination of nasal smears were performed.
Main Results:
- The mupirocin + propolis group showed a significantly greater reduction in bacterial counts compared to mupirocin or propolis alone (p < 0.0001).
- Combined therapy led to a significant decrease in polymorphonuclear leukocyte (PMNL) count, indicating reduced inflammation.
- Mean bacterial counts were substantially lower in the combination group (360.2 cfu/mL) versus mupirocin (4120.6 cfu/mL) or propolis (5980.8 cfu/mL) alone.
Conclusions:
- Propolis enhances the efficacy of mupirocin in reducing MRSA nasal carriage.
- The combination therapy offers a more profound reduction in bacterial load and inflammatory response.
- Propolis represents a promising adjuvant agent for MRSA decolonization strategies.
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