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ORIGINAL RESEARCH  
Year : 2019  |  Volume : 30  |  Issue : 3  |  Page : 342-346
East java extract propolis as potential intracanal medicament in experimentally induced chronic apical periodontitis


Department of Conservative Dentistry, Faculty of Dental Medicine Airlangga University, Surabaya, East Java, Indonesia

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Date of Web Publication9-Aug-2019
 

   Abstract 

Introduction: A persistent infection after cleaning and shaping root canal is the main etiology of root canal treatment failure. Enterococcus faecalis has been considered as one of the most resistant species in root canal treatment. E. faecalis can stimulate receptor activator of nuclear factor-kappa B ligand (RANKL) which can increase nuclear factor of activated T-cell (NFATc1) in chronic apical periodontitis. East Java propolis has antibacterial effects and is biocompatible with in vitro effects. Aim: This study is aimed to analyze the East Java propolis extract as potential intracanal medicament in chronic apical periodontitis caused by E. faecalis bacterial infection. Materials and Methods: This study used 30 Wistar rats divided into three groups. In Group I, the first upper right molar tooth as healthy tooth was used for negative control group. In Group II, the first upper right molar tooth was used for a prepared root canal, and 10 ml brain heart infusion broth containing E. faecalis ATCC29212 106 CFU was injected into the canal and restored with glass-ionomer cement (GIC) for the experimentally induced chronic apical periodontitis group. In Group III, after root canal preparation, E. faecalis ATCC 29212 106 CFU was injected, and then, 10 μl propolis applied and tooth restored with GIC. It took 21 days for the periapical lesions to develop after pulp infection. The rats were then sacrificed to conduct immunohistochemical examinations in order to measure the expressions of RANKL and NFATc1. Results: The average of RANKL and NFATc1 expression in Group III was significantly lower than those in the experimentally induced chronic apical periodontitis group (P < 0.05). Conclusion: It can be concluded that East Java propolis extract is a potential intracanal medicament through the study of experimentally induced chronic apical periodontitis caused by E. faecalis infection in Wistar rats.

Keywords: Enterococcus faecalis, East Java propolis, nuclear factor of activated T-cell, Receptor activator of nuclear factor-kappa B ligand

How to cite this article:
Yuanita T, Kunarti S, Zubaidah N. East java extract propolis as potential intracanal medicament in experimentally induced chronic apical periodontitis. Indian J Dent Res 2019;30:342-6

How to cite this URL:
Yuanita T, Kunarti S, Zubaidah N. East java extract propolis as potential intracanal medicament in experimentally induced chronic apical periodontitis. Indian J Dent Res [serial online] 2019 [cited 2019 Oct 18];30:342-6. Available from: http://www.ijdr.in/text.asp?2019/30/3/342/264112

   Introduction Top


Persistent infection after cleaning and shaping root canal is the primary etiology of root canal treatment failure. Enterococcus faecalis is the most common species found in root canal treatment failure. The prevalence of E. faecalis in re-treatment is 89.9%.[1],[2]

Chronic inflammation in the periapical area of the teeth is known as chronic apical periodontitis, an active host defense against invasion of bacteria and their toxins. It is felt that if chronic apical periodontitis can be prevented, the failure of root canal treatment will be overcome.

Propolis is a popular drug in many Asian countries and has broad spectrum of biological activity, including antibiotics, antifungal, anti-inflammatory, and anticancer effects. Caffeic acid phenethyl ester (CAPE) is the active component (over 50%) contained in propolis. CAPE is a potent inhibitor for activation of nuclear factor-kappa B (NF-κB) that can inhibit NF-κB and reduce COX-2 expression, a gene derived from the regulation of NF-κB. Propolis is also considered as anti-inflammatory and an immunomodulator.[3]

Receptor activator of NF-κB ligand (RANKL) is a family of tumor necrosis factor (TNF)-related activation-induced cytokine, osteoprotegerin ligand, and osteoclast differentiation factor. RANKL is a Type II membrane protein, which has RANK receptor, is a key of essential bone remodeling in the development and activation of osteoclasts.[4]

RANKL prevents osteoclastogenesis, which will cause bone resorption. RANKL plays a very dominant role over the setting of bone resorption, so none could replace it in the process of bone resorption when there is no RANKL.[5] The optimal RANKL expression in the 3rd week is periapical lesion formation, which then decreases at week 4 followed by periapical bone destruction.

Nuclear factor of activated T-cell (NFATc1) is a key regulator in bone because NFAT signaling is an important factor for osteoclast differentiation and bone resorption. Is an osteoclastogenesis controller because it coordinates bone resorption by recruiting osteoclast precursor to multinucleus.[6]

NFAT, a key regulator in bone, is a group of transcription factors that have been identified in T-cells, having four isoforms, c1-c4. Activated NFAT will result in translocation to the nucleus and binding to specific regions on the target gene. Activation of NFATc1 can control osteoclast differentiation.[7] NFATc1 activated by TRAF6 plays an important role in osteoclastogenesis.[8],[9] NFATc1 forms complex transcriptions of specific osteoclasts.[8],[10]

NFATc1 activation induces TRAP + osteoclast formation, resulting in multinucleated osteoclasts (mature osteoclasts) which then triggers formation of active osteoclasts (ruffled border osteoclasts). The higher the production of active osteoclasts, the more bone resorption will occur.[11] For those reasons, this research aimed to analyze the effectiveness of East Java propolis extract as intracanal medicaments against RANKL and NFATc1 for experimentally induced chronic apical periodontitis caused by E. faecalis bacteria.


   Materials and Methods Top


This study used thirty Wistar rats divided into three groups, namely, negative control group, E. faecalis group, and treatment group with East Java propolis. The samples taken were homogeneous in gender, age, and weight. To obtain internal validity, those samples were randomly divided into three groups. Data obtained then was examined by statistical analysis to achieve the objectives of the study.

Next, those Wistar rats aged 12 weeks were anesthetized 80 mg/kg of ketamine and 10 mg/kg of xylazine with intraperitoneal technique in sterile phosphate buffered saline. Those rats then were fixed on retraction board, and later, the pulp of their right maxillary molar was opened using a low-speed electric handpiece with a round bur sized ¼. Group I was as the negative control group that has healthy pulp. Then, in Group II, which was the E. faecalis group, the pulps opened were immediately induced with 10 ul of BHI-b containing 106 CFU of E. faecalis ATCC29212 bacteria and filled with glass-ionomer cement (GIC) to prevent contamination with oral microorganisms. Meanwhile, in Group III, as the treatment group, the pulps opened were immediately induced with 10 ul BHI-b containing 106 CFU of E. faecalis ATCC29212 bacteria, and then, 10 μL of propolis was applied and filled with GIC. It took 21 days to manifest the chronic apical periodontitis after pulp infection.[12] The Wistar rats were sacrificed for immunohistochemical examination to measure the expression of RANKL and NFATc1.


   Results Top


ANOVA test [Table 1] was conducted to know whether there were differences of RANKL expression among the groups after the application of East Java propolis extract.
Table 1: The results of ANOVA test for receptor activator of nuclear factor-kappa B ligand variables

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To know the significance of the differences of RANKL among the groups, Tukey's Honest Significant Difference (HSD) test was conducted as shown in [Table 2].
Table 2: The results of Tukey's honestly significant difference test on receptor activator of nuclear factor-kappa B

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The results [Figure 1] showed that there were significant differences of RANKL between the negative control group and the E. faecalis group within the propolis group.
Figure 1: Expression of receptor activator of nuclear factor-kappa B ligand in periapical region. (a and d) Is a negative control group, (b and e) Is a Enterococcus faecalis group, and (c and f) Is propolis group

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Next, to know whether there were differences of NFATc1 among the groups, ANOVA test was conducted as shown in [Table 3].
Table 3: The results of ANOVA test on nuclear factor of activated Tc1 variables

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To know the significance of the differences of NFATc1 among the groups, Tukey HSD Test was conducted as shown in [Table 4].
Table 4: The results of Tukey's honestly significant difference test on nuclear factor of activated Tc1

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The results [Figure 2] showed that there were significant differences of NFATc1 between the negative control group and the E. faecalis group within the propolis group.
Figure 2: The expression of nuclear factor of activated T-cell in periapical Wistar rats. (a) Negative control, (b) Propolis, (c) Enterococcus faecalis

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   Discussion Top


Pulp necrosis lead to the emergence of chronic apical periodontitis. Chronic apical periodontitis usually is a continuation of acute apical periodontitis. Chronic apical periodontitis can also be considered as a long inflammatory process and enlarged lesions are seen without subjective signs or symptoms. Apical periodontitis consequently can be an indicator of root canal treatment failure often without clinical symptoms. It is only through radiographic imaging that chronic apical periodontitis can be detected.

Chronic apical periodontitis moreover is closely related to local factors such as bacteria. The complex anatomical shape of the root canal makes complete removal of infectious sources impossible. Cleaning and shaping phases of root canal can can cause bacteria to enter into the apical region thus resulting in reinfection.[13] Chronic apical periodontitis can thus be known as an asymptomatic condition originating in the pulp caused by bacteria, associated with inflammation and periapical tissue destruction.[14]

E. faecalis bacteria have been identified as a species that can survive the root canal treatment and also persist as pathogens in dentin tubules since they have the nature of genetic polymorphisms and can bind to dentin because of their serine protease, gelatinase, and gelatin-binding protein.[15] In vitro research has shown that E. faecalis can survive for even 12 months post obturation.[16] Since E. faecalis bacteria can survive in the apical region of root canal treated teeth thus leading to failure of the root canal treatment itself, it is important to look for natural and potential medicament materials. These medicament materials must have antibacterial and antibiofilm properties against E. faecalis as well as reduce the formation of RANKL and NFATc1 as a transcription factor controlling osteoclasts causing periapical bone resorption.

Propolis as a potential natural medicament is a yellow-brown to dark brown resin, the substance that the honeybee, Apis mellifera, collects from tree buds, sap, shrubs, and other vegetable sources. In other words, propolis is a generic name given to a resin material collected by honeybees from various plants. The bees mix the resin material with an enzyme secreted from their mandibular glands. Nonetheless, components found in propolis are unchanged.

In addition, propolis is composed of resin (50%), wax (30%), essential oils (10%), pollen (5%), and organic components (5%).[17] The resin contains flavonoids, phenols, and various forms of acid.[18] One of the phenols found in propolis is CAPE. CAPE is a phenolic compound, structurally related to flavonoids, and considered as one of the main components of propolis. CAPE, based on in vitro and in vivo researches, is also considered to have both anti-inflammatory properties that are potent inhibitors of NF-κB and anti-inflammatory effects. NF-κB activation then is induced by mitogen and cytokines. Next, CAPE inhibits the synthesis of DNA, which binds to NF-κB suppressing the induction of gene expression in pro-inflammatory cytokines. CAPE also directly inhibits both COX-1 and COX-2 enzymes and COX-2 gene expression activation (prostaglandin) as well as acts as an immunostimulant.[19]

In recent years, in vitro research on East Java propolis extract in the field of dental conservation has shown that propolis has antibacterial and antibiofilm properties against E. faecalis at a concentration of 12%. In addition, propolis is safely used at a concentration of 25%.[20] However, in vivo researchers still cannot clearly explain how periapical lesions can be prevented. Thus, this research aimed to utilize East Java propolis extract as biocompatible and potential intracanal medicaments for chronic apical periodontitis caused by E. faecalis bacterial resistance.

Based on the results of this research, it is known that East Java propolis extract could reduce apical periodontitis (P < 0.05) induced by E. faecalis bacteria since propolis can inhibit NF-κB and pro-inflammatory cytokines, such as IL-1 and TNF-α. Propolis extract significantly suppresses inflammation by blocking the activation of NF-κB as a transcription factor, so that it does not penetrate into the cell nucleus.[21] Osteoclast formation and bone resorption are induced by RANKL and TNF. Those cytokine inductions require NF-κB p50 and p52 as well as c-Fos and NFATc1 expressed on osteoclast precursors. Similarly, a research conducted by Yamashita et al.[22] shows that RANKL and TNF directly induce osteoclast formation derived from NF-κB p50/p52 when c-Fos or NFATc1 is expressed. RANKL and TNF induced c-Fos expressions, which require RANKL to induce the activation of NFATc1, so the number and capacity of osteoclasts will increase.

Moreover, based on the results of this research, it is also known that East Java propolis could significantly lower NFATc1 (P < 0.05). NFATc1 is a key regulator in bone because NFAT signaling is an important factor for osteoclast differentiation and bone resorption. It is an osteoclastogenesis controller because it coordinates bone resorption by recruiting osteoclast precursors to become multinuclear.[6]

CAPE in East Java propolis extract, furthermore, is known to be able to inhibit NF-κB, NFAT, and activator protein-1 transcription. CAPE can also inhibit dependent transcriptional activity of NF-κB without causing degradation of cytoplasmic NF-κB inhibitor protein, iBκB (CAPE can inhibit NF-κB dependent transcriptional activity without caused degradation of NF-κB cytoplasmic protein inhibitor, iBκB). It means that NF-B can bind to DNA and Gal4-p65 transcriptional activity of the hybrid protein if there is CAPE. In addition, CAPE can also inhibit DNA binding and transcriptional activity of NFAT dephosphorylation. Next, NFATc1 activation induces TRAP + osteoclast formation, resulting in multinucleated osteoclast (mature osteoclasts) then triggering formation of active osteoclasts (ruffled border osteoclasts). Therefore, the higher the production of active osteoclasts is, the more bone resorption will occur.[11]

Propolis as a natural product is known also as an antimicrobial agent.[20] On the other hand, root canal treatment failure caused by E. faecalis bacterial resistance is a challenge. Therefore, East Java propolis extract can reduce the number of osteoclasts. This is in line with a research conducted by Pileggi et al. proving that propolis can prevent osteoclast maturation.[23] Propolis can also inhibit the final stage of osteoclast maturation, including fusion of osteoclast precursors to form giant cells and actin rings. These support the hypothesis that propolis can be used as a medicament to reduce resorption and as an antibacterial against oral pathogens, including E. faecalis.

In addition, Pileggi et al. studied the direct inhibitory effect of propolis in the final stages of osteoclast maturation. Meanwhile, Ang et al. reported that propolis inhibits osteoclast differentiation through increased OPG binding to RANKL preventing bone resorption.[24] Besides that, CAPE is also known as an active component of propolis that can reduce osteoclastogenesis and bone resorption by pressing RANKL.[25] In conclusion, East Java propolis extract can be considered as an effective intracanal medicament for experimental chronic apical periodontitis caused by E. faecalis bacterial resistance by decreasing RANKL and NFATc1 expressions in periapical tissues of Wistar rats.


   Conculsion Top


The east java extract propolis is potential intracanal medicament in experimentally chronic apical periodontitis cause by E. faecalis, bacterial resistance by decreasing RANKL and NFATcl expression in periapical tissue of wistar rats.

Acknowledgment

Thank's to Tony Hapsoro for statistical analyses of the experimental data.

Financial support and sponsorship

This work was financially supported by the Government of Indonesia through Institution of Research and Technology Airlangga University.

Conflicts of interest

There are no conflicts of interest.

 
   References Top

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24.
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Correspondence Address:
Dr. Sri Kunarti
Department of Conservative Dentistry, Faculty of Dental Medicine Airlangga University, Surabaya, East Java
Indonesia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijdr.IJDR_236_17

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