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Background:
Review

The in Vitro Antimicrobial Efficacy of Propolis against Four Oral Pathogens: A Review

by
Nadine Michèle Waldner-Tomic
1,4,
Rosmarie Vanni
2,4,
Georgios N. Belibasakis
3,
Thomas Thurnheer
3,
Thomas Attin
4 and
Patrick R. Schmidlin
4,*
1
Private Practice, Zurich, Switzerland
2
Private Practice, Männedorf, Switzerland
3
Section for Oral Microbiology and Immunology, Institute of Oral Biology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH 8032 Zürich, Switzerland
4
Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH 8032 Zürich, Switzerland
*
Author to whom correspondence should be addressed.
Dent. J. 2014, 2(3), 85-97; https://doi.org/10.3390/dj2030085
Submission received: 15 May 2014 / Accepted: 18 June 2014 / Published: 21 July 2014
Versions Notes

Abstract

:
This study screened the available evidence for the in vitro antimicrobial efficacy of propolis, a natural herbal resin bee product, against a selection of three bacterial species of relevance to oral diseases. For this purpose, papers dealing with laboratory studies assessing minimum inhibitory concentration (MIC), minimum bactericidal concentrations (MBC) or the agar diffusion method to analyze the antimicrobial properties of propolis on three oral pathogens (S. mutans, P. gingivalis, F. nucleatum) and a yeast (C. albicans) are reviewed. Overall, a positive antimicrobial effect could be shown. However, when compared to the commonly used control substances (e.g., specific antibiotics, antiseptics and antifungals), propolis appeared less effective, depending on the bacterial strain, and required higher concentrations than the control substances, in order to show a measurable effect. Nevertheless, propolis as a natural herbal resin bee product can be considered as a natural antiseptic agent within the range of other herbal products, like sanguinarine. Therefore, it may be a valuable compound of non-synthetic, natural origin for patients seeking complementary agents and alternatives for “hard” chemicals.

1. Introduction

Bacteria are recognized to be a main causative factor for the development of periodontitis and caries. It has been shown that professional plaque control will thus prevent disease initiation and stop its progression. Thus, the main treatment target remains the effective reduction of the supra- and sub-gingival pathogenic flora, mostly by mechanical means. However, a variety of chemical means, like antibiotics and antiseptics, have been introduced as an adjunct to mechanical therapy [1,2]. Whereas the use of antibiotics is warranted in certain cases, especially in aggressive cases or patients with AN insufficient response to non-surgical therapy, it is associated with certain risks, notably the development of antibiotic resistance in various bacterial species [3]. The administration of antimicrobial agents as a quick and inexpensive means of supporting mechanical periodontal debridement is therefore still worth consideration [4]. Alongside well-investigated and established chemicals frequently used in gingivitis/periodontitis prophylaxis and treatment protocols, like chlorhexidine or iodine, natural products may represent a suitable alternative, exhibiting less or no side effects [5]. Among them, herbal bee products, like honey and propolis, have a great potential to be used as adjuncts to mechanical periodontal treatment and infection control, as well.
Propolis is a honeybee product, which is used to cover hive walls and fill gaps. Bees collect the resin-like product from cracks in the bark of trees and leaf buds [6,7]. Thereby, propolis does not only act as a structural compound, but is mainly responsible as a chemical agent for the safety of honeycombs, especially against microorganisms [8,9,10]. The chemical composition of propolis is highly variable and depends on the local flora at the site of collection and on the season of collection [11,12,13]. It is a lipophilic, resinous material collected from living plants, which is mixed with the enzyme, beta-glycosidase, present in the bees’ saliva, partially digested and added to beeswax to form the final product [14]. Despite potential intrinsic differences, which may depend on the origin, it has been proven that most propolis variants have a wide range of biological therapeutic effects, such as antimicrobial, antifungal and antiviral activity [10,15,16]. Therefore, sufficient evidence is available in the literature to justify propolis as a good candidate adjunct to prevent or treat infectious diseases. Several laboratory studies exist, which assessed the antimicrobial potential of propolis using different in vitro test systems in order to evaluate the potential to inhibit the bacterial growth (bacteriostasis) or to induce bacterial death (bactericidal effect). To measure this potential, several evaluation methods are available, e.g., simple agar diffusion tests or dissolution assays. The latter determine either the minimum inhibitory (MIC), the minimum bactericidal concentrations (MBC) or agar diffusion tests, which, in principle, visually or optically assess the inhibition of bacterial growth. These tests are therefore commonly used to determine the potential of the agents and to classify them in relation to alternative chemical substances (controls). Antimicrobials are usually regarded as bactericidal, if the MBC is not more than four times the MIC [17]. Based on microbiological data derived from such assays, it has been suggested that propolis may even be of clinical value [18,19]. However, a systematic evaluation on the antimicrobial effects of propolis on bacterial species relevant to oral diseases and dentistry in general is still lacking.
This review therefore aimed to evaluate the evidence for the laboratory efficacy of propolis against a selection of three bacterial species with a high association with periodontitis and caries (S. mutans, P. gingivalis, F. nucleatum) and a yeast (C. albicans). For this purpose, articles published in between 1960 and 2013 were screened.

2. Materials and Methods

2.1. Search Strategy

In order to conduct a review of the data published on the specific subject of interest, a literature search of the U.S. National Library of Medicine (PubMed) was performed. Articles from the inception of these databases up to and including June, 2013, were considered. The following strategy was qpplied: ("anti-bacterial agents"[MeSH Terms] OR ("anti-bacterial"[All Fields] AND "agents"[All Fields]) OR "anti-bacterial agents"[All Fields] OR "antibacterial"[All Fields] OR "anti-bacterial agents"[Pharmacological Action]) OR ("anti-infective agents"[MeSH Terms] OR ("anti-infective"[All Fields] AND "agents"[All Fields]) OR "anti-infective agents"[All Fields] OR "antimicrobial"[All Fields] OR "anti-infective agents"[Pharmacological Action]) OR ("anti-infective agents"[MeSH Terms] OR ("anti-infective"[All Fields] AND "agents"[All Fields]) OR "anti-infective agents"[All Fields] OR "antiinfective"[All Fields] OR "anti-infective agents"[Pharmacological Action]) OR ("disinfection"[MeSH Terms] OR "disinfection"[All Fields]) OR bactericidal[All Fields] OR bacteriostatic[All Fields] AND ("propolis"[MeSH Terms] OR "propolis"[All Fields]).

2.2. Study Selection

In the first step, two reviewers (the first and second author) independently screened all titles and then the abstracts of the electronic search and assessed them for possible inclusion in the review. All potentially eligible studies were ordered, and their full texts were assessed. Only studies written in English, German, French and Italian were included. Studies reporting on animal, gynecological, laryngological and dermatological experiments were excluded. Any disagreement concerning inclusion was resolved by discussion.

2.3. Eligibility Criteria for Studies

After reading the full text of the selected studies, the assessed bacterial taxa assessed and the methodologies used were recorded and the data were resumed in tables. Only studies were included that used the MIC, MBC or the agar diffusion assays and that investigated the effect of propolis on S. mutans, P. gingivalis, F. nucleatum or C. albicans.

3. Results

3.1. Search Results

From the 1,373 titles initially obtained from the literature search, 171 full texts were assessed. Eighty-six articles were excluded because they were considering animal or dermatological studies. In the next step, 57 articles were excluded mainly for the following reasons:
-
The requested laboratory method was not assessed (i.e., no MIC/MBC or agar diffusion evaluation);
-
None of the requested bacteria were assessed.
Finally, 28 original articles were analyzed that matched the inclusion criteria with regards to the three microbiological evaluation methods (Table 1, Table 2, Table 3 and Table 4). From each study, the respective results were identified and recorded, accordingly. The mean values and ranges (minimum and maximum values) were provided, where applicable.

3.2. Agar Diffusion Method

Table 1 provides a summarized data set regarding the agar diffusion method. In general, the use of propolis resulted in smaller inhibition zones than the respective control media. No available data were found for F. nucleatum. In the case of S. mutans, the mean values of the inhibition zones were about 60% smaller than those of the control groups. The substances commonly used as controls in these studies were chlorhexidine and sanguinarine. The inhibition zone for propolis ranged from 0.2 to 22 mm, whereas for the control groups, these zones ranged from 25 to 28 mm. For C. albicans, the mean value for the zone of inhibition accounted for about 50% of the control groups. The control substances commonly used were chlorhexidine, itraconazole and ketoconazole. The inhibition zone for propolis ranged from 0.8 to 14 mm, whereas the inhibition for the control groups ranged from 16 to 20 mm.

3.3. MBC and MIC

The results of the MBC evaluation indicated that propolis generally did not act as effectively as the compared control substances (Table 2). For S. mutans, the required mean MBC was almost 100-times higher than that of the control group. The control substance in this case was chlorhexidine, vestitol and neovestitol. The range of the MBC of propolis was very wide, spanning from 6.25 μg/mL to more than 1,600 μg/mL. One study showed that propolis exhibited an antimicrobial effect on C. albicans, which was even greater than the control substance, chlorhexidine [21].
In Table 3, the result of studies assessing the MIC is provided. Once again, it could be shown that the effect of propolis was lower than the control substances, especially when S. mutans and P. gingivalis were tested. The MIC for S. mutans was comparable to the ones obtained by the corresponding control groups. The mean values of the MIC of propolis ranged from 0.5 to 12,500 μg/mL, whereas those of the control groups ranged from 0.015 to 37,500 μg/mL, respectively. For F. nucleatum and C. albicans, the mean values of the MIC were only approximately twice as high as the MICs of the control groups. For P. gingivalis, however, the MIC of propolis was about 360=times higher than the MIC of the control groups.
Table
Table 1. Results of the agar diffusion tests (inhibition zones in mm) to evaluate propolis and control compounds (indicated with different superscript letters).
Table 1. Results of the agar diffusion tests (inhibition zones in mm) to evaluate propolis and control compounds (indicated with different superscript letters).
Ref.S. mutansP. gingivalisF. nucleatumC. albicans
PropolisControlPropolisControlPropolisControlPropolisControl
MinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMax
[34]101213 91113
[35] 20 a 28 14 b 20
[36]5.55.96.3
[25] 2 3.4 0.8
[37] 22 c 27.6 10.4 c 19
[38] 13 c 25 10 c 16
[39] 15 a 28 13 b 20
[40] 14 d 16
[41]0.20.30.4
[42] 1821.525
Mean11.327.112.4510.518.2
(a) Sanguinarine; (b) itraconazole; (c) chlorhexidine; (d) ketoconazole; (e) CaOH2; (f) camphorated paramonochlorophenol; (g) formocresol; (h) fluconazol; (i) meropenem; (j) penicillin G; (k) penicillin; (l) miconazole; (m) tetracycline; (n) metronidazole; (o) erythromycin; (p) clindamycin.
Table
Table 2. MBC (minimal bactericidal concentration; µg/mL) of propolis and control compounds (indicated with different superscript letters).
Table 2. MBC (minimal bactericidal concentration; µg/mL) of propolis and control compounds (indicated with different superscript letters).
Ref.S. mutansP. gingivalisF. nucleatumC. albicans
PropolisControlPropolisControlPropolisControlPropolisControl
MinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMax
[9]6.25 12.5
[21] 75 c 512
[43] 384 358.4
[36] >1,600
[44] 500 8
[26] 400
[45] 1562.5 e 1,562.5
f 680.0
g 1,480.0
[46]200300400
[47]53 106
[48]100150200
[49] >1,600
Mean7588384960.41,240.875512
(a) Sanguinarine; (b) itraconazole; (c) chlorhexidine; (d) ketoconazole; (e) caoh2; (f) camphorated paramonochlorophenol; (g) formocresol; (h) fluconazol; (i) meropenem; (j) penicillin g; (k) penicillin; (l) miconazole; (m) tetracycline; (n) metronidazole; (o) erythromycin; (p) clindamycin.
Table
Table 3. MIC (minimal inhibitory concentration; µg/mL) of propolis and control compounds (indicated with different superscript letters).
Table 3. MIC (minimal inhibitory concentration; µg/mL) of propolis and control compounds (indicated with different superscript letters).
Ref.S. mutansP. gingivalisF. nucleatumC. albicans
PropolisControlPropolisControlPropolisControlPropolisControl
MinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMaxMinMeanMax MinMeanMax
[21] 150 c 512
[50] 35
[51]82032 0.52.0254
[35] 170 a 15 940 h 10
[43] 294.4 256
[36] 100
[44] 125 c11.52
[20] 256 i 1 1024 i 0.06
j 0.03 j 4
[26] 50
[45] 390.6 e 781.2
f 170.0
g 371.0
[46]5075100
[38] 200 k 0.0922 90 l 5.9
[52]83664
[39] 0.5 a 0.015 41832
[19] m 4 0.8 h 0.01
j 0.03
n 4
o 0.5
i 1
p 0.5
[47]3.34.956.6
[48]100150200
[53]3,1307,81512,500
[54] 0.5
[55] 27,470 n 37500
[49]2537.550
[42] 0.010.0560.1
Mean2,419.312,500.5183.50.51556.87265.3199.8132
(a) Sanguinarine; (b) itraconazole; (c) chlorhexidine; (d) ketoconazole; (e) caoh2; (f) camphorated paramonochlorophenol; (g) formocresol; (h) fluconazol; (i) meropenem; (j) penicillin g; (k) penicillin; (l) miconazole; (m) tetracycline; (n) metronidazole; (o) erythromycin; (p) clindamycin.
In summary, propolis showed a positive antimicrobial effect. However, when compared to a diversity of standard control substances, like established antibiotics, antiseptics and antifungals, propolis was less effective and required higher concentrations than the control compounds.

4. Discussion

Most oral diseases are primarily caused, or at least modified, by bacteria that inhabit the oral cavity. Among them, caries and periodontitis represent the most common pathological conditions, which are caused by the biofilm-forming bacteria and yeasts of dental plaque. Accordingly, most of the prophylactic and therapeutic interventions aim to reduce the bacterial load in such a way that oral health can be maintained or obtained. Antimicrobials are useful to support these efforts by effectively inhibiting the formation or removing established biofilms.
Propolis has been used since ancient times as a remedy for the treatment of many diseases in folk medicine. It is considered to be safe in low doses besides its antimicrobial activity [22]. Numerous in vitro studies are available on the antimicrobial capacity of propolis, and therefore, the aim of this review was to gain an overview of these findings, in order to determine if propolis can be considered for further clinical investigations of these. For maintaining a focused question, three microbiological methods were considered, in investigating four oral species, which included the cariogenic S. mutans, the periodontitis-associated P. gingivalis and F. nucleatum (which can be found in several inflammatory conditions) and the yeast, C. albicans, which is involved in oral candidiasis. In this context, it should also be clarified that neither definitive conclusions about a wider range of pathogens, nor the efficacy of propolis on clinically applicable models can be made from this review. In particular, a starting point for the latter would be the study of the effect of propolis on more complex biofilm models. A. naeslundii would also have been potentially interesting. However only two studies included this bacteria, and therefore, these studies could not be considered in this review. In this context, other potential relevant databases, such as The Biological Abstracts, Chemical Abstracts, Medline, Web of Science, Highwire and Lilacs, could have been helpful. However, since we were focusing more on dental and medical applications and related bacteriology, our search was limited to PubMed. Its use resulted already in a large number of potential literature.
By the single bacterial approach and the narrowed microbiological assays targeted by the present review, the collected data allowed for a ground comparison of the effectiveness of propolis, in comparison to some standard antimicrobial agents, which are designated in this paper as “controls”. However, the heterogeneity of the controls ranging from frequently-used antiseptics, like chlorhexidine, to antibiotics still made a direct comparison difficult. Nevertheless, as a principal finding, it could be elaborated that propolis showed a clear antibacterial effect, which was, however, less effective than the investigated control agents and required, in fact, higher concentrations than those (10- to 100-times higher MIC and MBC). The inhibition zones in the agar diffusion test were correspondingly smaller in comparison to the control substances. However, these overall differences could hypothetically be narrower in real-life application, given the fact that the total concentrations of various medicaments must anyway be even greater under clinical conditions than in the planktonic state, in order to obtain a successful microbiological outcome [23].
Another matter to consider when comparing these studies is, on the one hand, the large number of control substances used and, on the other hand, the different origin and formulation of propolis. Most of these studies that have assessed propolis come from Brazil (Table 4). Propolis from this origin showed superior effectiveness, compared to others [24,25,26]. Clearly, the composition of propolis depends upon the vegetation of the area from which it is collected [27]. This natural or intrinsic potential is also influenced by the galenic formulation and preparation, e.g., the use of solvents, like alcohol. Therefore, it is difficult to assess and rate the sole activity of propolis itself in this context.
Table
Table 4. Geographic origin of propolis.
Table 4. Geographic origin of propolis.
Number of PublicationsOrigin of Propolis
14Brazil
2Greece
2Turkey
2Laboratory-manufactured
1Korea
1Tunisia
1Argentina and Uruguay
1Uruguay
1Czech Republic
1European-Siberian
1Irano-Turanian
1Lithuania
1Poland
1China
In the obtained literature, sanguinarine is described as another natural product showing an antibacterial effect, exhibiting an effective plaque-inhibiting potential. It is isolated from Sanguinaria canadensis and has been widely used in industrial toothpaste and mouthwash products [28]. The MIC and MBC for sanguinarine against S. mutans, as an example, were reported to be 15.6 and 31.3 µg/mL, respectively, which was also much higher than the respective values obtained for chlorhexidine, which accounted for 1 and 2 µg/mL. Unfortunately, no data regarding the MIC of chlorhexidine was available as a control agent with regard to periodontal bacteria [29]. Stanley and co-workers systematically determined the susceptibility to chlorhexidine of a range of bacteria isolated from subgingival plaque. The modal value of the MIC was found to be 62 µg/mL, and 64% of the strains tested were inhibited at this concentration. A concentration of 250 µg/mL of chlorhexidine inhibited the growth of all bacteria in the 25 subgingival plaque samples investigated [30].
Propolis therefore also displayed an antibacterial potential, although weaker than other conventional pharmaceutical substances testes. However, despite the fact that the antibacterial efficacy of propolis may be somewhat limited, the ongoing search and evaluation of natural products is still warranted [31]. Interestingly, besides its antimicrobial potential, propolis has also been shown to inhibit the adherence of S. mutans onto glass, which offers a “preventive” advantage, for instance in terms of biofilm formation and establishment [32]. In one instance, propolis showed antimicrobial activity similar to chlorhexidine and even greater than clove or sage extracts in a study using bacteria from the saliva of periodontally healthy subjects and those with chronic periodontitis [33].

5. Conclusions

Therefore, propolis has the potential, especially in the case of S. mutans, to develop into an antiseptic agent, but higher concentrations may be required. The product offers an alternative for patients seeking complementary agents and alternatives from synthetic chemicals. Especially for long-term usage, it may also be a valuable option, but the possibility of allergic or other adverse reactions should not be neglected and should be investigated further.

Conflicts of Interest

The authors declare no conflict of interest.

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MDPI and ACS Style

Waldner-Tomic, N.M.; Vanni, R.; Belibasakis, G.N.; Thurnheer, T.; Attin, T.; Schmidlin, P.R. The in Vitro Antimicrobial Efficacy of Propolis against Four Oral Pathogens: A Review. Dent. J. 2014, 2, 85-97. https://doi.org/10.3390/dj2030085

AMA Style

Waldner-Tomic NM, Vanni R, Belibasakis GN, Thurnheer T, Attin T, Schmidlin PR. The in Vitro Antimicrobial Efficacy of Propolis against Four Oral Pathogens: A Review. Dentistry Journal. 2014; 2(3):85-97. https://doi.org/10.3390/dj2030085

Chicago/Turabian Style

Waldner-Tomic, Nadine Michèle, Rosmarie Vanni, Georgios N. Belibasakis, Thomas Thurnheer, Thomas Attin, and Patrick R. Schmidlin. 2014. "The in Vitro Antimicrobial Efficacy of Propolis against Four Oral Pathogens: A Review" Dentistry Journal 2, no. 3: 85-97. https://doi.org/10.3390/dj2030085

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