Abstract
Myracrodruon urundeuva Allemão, Anacardiaceae, is popularly known as “aroeira-do-sertão”. It is a common species in the state of Ceará and widely used for its anti-inflammatory, anti-ulcer, astringent, anti-allergic, and antidiarrheal activities and also in the treatment of skin wounds. The aim of this study was to evaluate the healing effect of the cream prepared with the decoction from the stem bark of a 7-year-old cultivated M. urundeuva in rats submitted to excisional wounds. Male Wistar rats were divided into three groups: sham group, which did not received a treatment; 10% “aroeira” cream group, which received application of the plant cream; and control group, which received application of the base cream. The animals had their skin fragments (8 mm in diameter) removed, and each group was observed at 2, 7, and 12 days after surgery. The macroscopic analysis was performed with a digital paquimeter. The fragments of newly formed tissue were removed from the skin for slides processing and hematoxylin-eosin (HE) and picrosirius red staining techniques, in order to verify the effect of the 10% “aroeira” cream in different stages of the healing process. Macroscopic analyses demonstrated a decrease in the area of the 10% “aroeira” cream treated wounds, compared with controls. In addition, the histological study evidenced an improvement in the inflammatory aspects (infiltrate, edema, hemorrhage), in this treated group, as well as the presence of a new epithelium and a greater intensity in collagen deposition. Thus, a favorable effect was observed regarding the use of 10% “aroeira” cream in the cicatricial process of cutaneous wounds in rats, modulating the inflammatory response of healing and accelerating tissue repair of experimental excisional skin wounds.
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Introduction
Wounds can be defined as acute or chronic ruptures of any soft parts of the body, with or without damage to its functions, and caused by external and/or internal factors. They can be classified, according to their etiology, complexity, and time of existence (Smaniotto et al. 2010). The healing of a wound is a dynamic process to restore the structure of the injured tissue. The healing process, divided into three phases, is essential for the local debridement (inflammatory phase), the formation of granulation tissue (angiogenesis), followed by proliferation of fibroblasts, extracellular and collagen matrix formation, reepithelialization, and finally, by the tissue remodeling (Andrade et al. 2011).
There are several diseases that interfere negatively in the tissue repair process, such as diabetes mellitus, systemic sclerosis, anemia, and malnutrition, among others. Additionally, many conditions make this process difficult for resolution, preventing or slowing down the complete restoration of the tissues. By somehow hindering the tissue repair, these diseases contribute to the potential for increased morbidity and mortality (Mendonça and Coutinho-Netto 2009).
The use of medicinal plants for the treatment of pathologies exists since the most remote times, although their acceptance in modern medicine still find resistance (Baharvand-Ahmadi et al. 2016). A recent systematic review focusing on the use of medicinal plants for the treatment of skin lesion in humans (clinical trials published from 1997 to 2017), selected ten studies involving 503 patients. Among the medicinal species studied, two of them (Aloe vera and Mimosa tenuiflora) are native from Brazil (Lordani et al. 2018). In addition, evidences (see Shedoeva et al. 2019, for a review) indicate the use of medicinal plants and plant-based products for cutaneous wound. Among the species studied, several stand out including Centella asiatica, Curcuma longa, and Paeonia suffruticosa.
Other studies (Schmidt et al. 2009) on Brazilian plants used in wound healing showed that among twelve plants the extracts from Galinsoga parviflora, Petiveria alliacea, Schinus molle, Waltheria doradinha, and Xanthium cavanillesii were the most active ones. Furthermore, Stryphnodendron adstringens and the oleoresin from Copaifera spp., both species belonging to the Fabaceae family, were also efficacious in wound healing (Ricardo et al. 2018). Interesting data (Veríssimo et al. 2015) from a University Hospital in the city of Maceió, Brazil, interviewing thirty patients bearers of wounds concluded that 70% of them used medicinal plants to treat varicose ulcers and diabetic foot. The most cited species were Stryphnodendron adstringens, Hyptis pectinata, and Schinus terebinthifolius.
Myracrodruon urundeuva Allemão, Anacardiaceae, popularly known as “aroeira-do-sertão”, is a common medicinal species in the state of Ceará, Northeast Brazil and has a wide pharmacological application. In the form of infusion and decoction, it has anti-inflammatory, anti-ulcerous, astringent, anti-allergic, and antidiarrheal activities and is also widely used in the treatment of cutaneous wounds (Viana et al. 1995, 2003).
The need and urgency for new molecules with a healing anti-inflammatory action can provide the market option of a cheaper treatment, increasing the adherence of patients to it by improving their live quality is eminent. For this reason, the present study objective is to evaluate the healing effect of the cream prepared from the decoction of the stem bark of cultivated M. urundeuva (DCCMU), in animals subjected to excisional wounds.
Method
This study was carried out at the Biophysiology Laboratory of the Faculty of Medicine Estácio of Juazeiro do Norte (Estácio/FMJ), in Juazeiro do Norte, Ceará. The project was approved by the Ethics Committee on Animal Use (CEUA) of the Estácio/FMJ, under the no. 2017.1-005. The experiments were performed according to the Guide for the Care and Use of Laboratory Animals, 8th. Edition (NIH, USA).
Preparation and Chemical Characterization of the Extract
The seeds from wild specimens of Myracrodruon urundeuva Allemão, Anacardiaceae, were cultivated in the horticulture sector of the Federal University of Ceará (UFC, Fortaleza, Brazil), in February 2012, and the exsiccatae are deposited at the UFC Prisco Bezerra Herbarium, under the number 48,904. The stem bark of a cultivated specimen of the (E)-β-ocimene chemotype was obtained from a 7-year-old plant.
Dried and powdered stem bark was submitted to decoction for obtaining the extract called MUCCCD. The decoction was characterized by ultra-efficiency liquid chromatography coupled to mass spectrometry (UPLC-ESI-TOF-EM), according to the methodology described by Aquino (2017). The decoction of the stem bark of the cultivated “aroeira” (MUCCCD) was subjected to a study of dereplication by HPLC-ESI-QTOF-EM. The identification of the compounds was performed by comparing the data obtained in both negative and positive modes, with data from the literature (Table 1). The compounds were identified and classified into seven groups: non-protein amino acids, carboxylic acids, catechins, chlorogenic and cinnamic acids derivatives, hydrolysable tannins, condensed tannins, and dimeric chalcones (Aquino 2017).
Preparation of the Cream
The cream of “aroeira” was developed at the Center for Studies of Pharmaceuticals and Cosmetics, Federal University of Ceará. It was carried out with cold neutralization and under agitation in an aqueous solution containing 1% of carboxyvinyl polymer, 5% glycerin, and 1% polypropyleneglycol. Methylparaben (0.15%) and propylparaben (0.05%) were added as preservatives and aminometilpropanol (q.s. 100 g) at pH 6.5 as a neutralizing agent. This cream was used as a control (base cream) and in the preparation of the 10% “aroeira” cream.
Animals
Male Wistar rats (200–250 g), from the Animal House of the Faculty of Medicine of Juazeiro do Norte (Estácio/FMJ), were shelted in cages (one animal per cage) in an air-conditioned environment, at the temperature of 24 ± 2 °C, under light/dark cycle conditions (12 h/12 h), with free access to a standard ration (Purina Chow) and drinking water. The animals were treated in accordance with current legislation and the ethical principles established by the Brazilian National Council for the Control of Animal Experimentation (CONCEA).
In order to perform all surgical procedures described as follow, the animals were anesthetized intraperitoneally (i.p.) with 10% ketamine hydrochloride, associated with 2% xylazine hydrochloride at doses of 100 mg/kg and 10 mg/kg, respectively (Hall et al. 1991).
After surgery, the animals received an intraperitoneal single dose of dipirone (Medley S/A, Campinas, SP, Brazil), 50 mg/kg body weight, diluted in saline for postoperative analgesia. At the end of the surgical procedure, the animals received subcutaneously (s.c.) 1 ml saline for fluid replacement and were maintained in a heated environment until complete recovery of anesthesia. After evaluation performed for 12 days past the surgical induction of the cutaneous lesion, the animals were anesthetized and euthanized by cervical displacement.
Healing Model by Second Intention (Excisional Wounds)
Two 8 mm diameter circular excisional wounds were induced to the dorsal surface of the animals, using a surgical punch for skin biopsy (Canesso 2014). At the end of the surgical procedures, the animals received subcutaneously (s.c.) 1 ml sterile saline solution for fluid replacement and were kept in a heated environment until the complete recovery from anesthesia.
Standardization of Experimental Groups
To all approaches described in this work, ten animals/group were used. They were divided into the following groups: sham group (animals undergoing surgical procedures of skin lesion induction, without any treatment); control group (animals submitted to surgical procedures of cutaneous lesion induction, followed by treatment with base cream); 10% “aroeira” cream group, 10% M. urundeuva (animals undergoing surgical procedures for the induction of cutaneous lesion, followed by treatment with 10% “aroeira” cream).
Macroscopic Analysis of Excisional Wounds
The area of excisional wounds was estimated on days 1, 3, 5, 7, 9, and 11, after surgery (n = 1/group/day), by measuring the cranial-caudal and latero-lateral diameters, with the aid of a digital paquimeter, and the calculation of the area by the equation: a = π.R.r, where “a” represents the area, “R” the greater radius, and “r” the minor radius of the wound (Prata et al. 1998).
Collection of Tissue Samples for Histological Analysis
Approximately 2 mm cylindrical tissue fragments were withdrawn from the neoformed tissue over the surgery region (n = 5/group/day) after skin removal, on days 2, 7, and 12, for the macroscopic study, as described previously. This procedure was performed with the use of an 8 mm diameter punch. After tissue collection, the animals were submitted to euthanasia by cervical displacement.
Histological Analysis
After removal, the tissues were fixed in a buffered solution of formaldehyde 10% (V/V) (pH 7.4) for 24 h and subsequently processed in the usual histological pattern. With the aid of a microtome, 5 μm thick sections were arranged in microscopy slides and submitted to hematoxylin-eosin (HE) staining techniques and picrosirius red. From the histological slides, photomicrographs were obtained by an optical microscope, coupled to a high resolution digital camera. The captured images were saved in JPEG format and analyzed by the ImageJ 1.43 software (U.S. National Institutes of Health) (Noursadeghi et al. 2008).
Statistical Analysis of Data
The analyses were performed with the Graph Pad Prism software, version 5.0. The results were expressed as mean ± SEM or median, according to the parameter evaluated. The data were analyzed by ANOVA followed by Tukey’s as the post hoc test, for multiple comparisons. p values < 0.05 represented significant statistical differences between the data, under a confidence interval of 95%.
Results and Discussion
When analyzing from the macroscopic point of view, the epidermis of all groups, the presence of crust was observed on the 7th postoperative day and the absence of reepithelialization. While, on the 9th day, the evidence of partial reepithelialization associated with the persistence of crusts was possible to detect. On the 11th day, the occurrence of total reepithelialization was noted (Fig. 1).
The mean area of the lesions was determined with the aim of investigating the effect of topical treatments on excisional wound contraction. The measurements were performed on days 1, 3, 5, 7, 9, and 11, after the induction of the wound (Fig. 3). There was a greater contraction of the wounds treated with 10% “aroeira” cream (p < 0.05), when compared with the untreated groups (Sham) and treated with base cream (vehicle, V).
The histological analysis reveals an improvement in the inflammatory aspects (infiltration, edema, hemorrhage) for the group treated with 10% “aroeira” cream, as well as the presence of a new epithelium, only on the 7th and 12th days of treatment.
Collagen was quantitatively evaluated on the 7th and 12th days after treatment of excisional wounds. Photomicrographs of histological slides stained by picrosirius red were captured to represent the process of collagen in all experimental groups (Fig. 4). On the seventh day, the wounds of the sham group had lower collagen deposition, compared with other experimental groups, but no difference was found in relation to the vehicle. The group treated with 10% “aroeira” cream showed the highest intensity in collagen deposition, demonstrating a significant difference. In the polarized images, the highest presence of collagen type I can be observed (red color) in the group treated with the 10% “aroeira” cream (Fig. 5).
The treatment of wounds has challenged health professionals especially in chronic disease patients. Brazil with is enormous biodiversity offers several options for the pharmaceutical industry by focusing on medicinal plants and their bioactive components. Several medicinal species point out as promising as Stryphnodendron adstringens, Carapa guianensis, Capaifera langsdorffii, and Schinus terebenthyfolius, which also belongs to the same family as M. urundeuva, among others (Veríssimo et al. 2015; Souza et al. 2017; Gushiken et al. 2017; Ricardo et al. 2018).
There are currently numerous options for topical treatment of wounds but despite this diversity, there are scarce evidences relative to the efficacy in promoting healing. Thus, the present study investigated the cicatrizing effect of Myracrodruon urundeuva and the use in Northeast Brazil for its anti-inflammatory, analgesic, and also cicatricial actions (Viana et al. 2003). M. urundeuva is listed by the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA) as an endangered species and thus the stem bark used in the present study came from a cultivated specimen. Although “aroeira” is widely disseminated as a cicatricial agent, few scientifically methodological studies have been produced to confirm its specific efficacy in the treatment of wounds, with results empirically known (Viana et al. 1995).
From macroscopic examination, on the third postoperative day, the wounds of animals belonging to the group treated with “aroeira” cream were hyperemic and with edematous edges. At the seventh postoperative day, the wounds were covered by a thin crust, a process which was also observed in the works of Santos et al. (2006), Martins et al. (2006), and Branco-Neto et al. (2006). These authors described that skin removal induces the development of continuity solution, filled by fibrin, clot, exudate inflammation, forming the crust that covers the wound.
As demonstrated, there was a decrease in the wound area treated with “aroeira” cream, in relation to the controls and contrasting with the data found by Branco-Neto et al. (2006), where the hydroalcoholic extract of another species of “aroeira” (Schinus terebinthifolius) delayed the reepithelialization of the skin wounds of rats, presenting an average area larger than that in the control group.
Tissue repair is a dynamic state that comprises different processes, including inflammation, cell proliferation, and synthesis of elements that constitute the extracellular matrix, such as collagen, elastin, and reticular fibers. Viana et al. (2003) showed an anti-inflammatory effect of “aroeira”, in the model of carrageenan-induced paw edema. In this study, the histological analysis demonstrated a decrease in the inflammatory process and formation of a new epithelium, in addition to increased deposition of collagen in the skin, favoring the tissue repair, in rats. The same was observed by Estevão et al. (2017), with the cream of Schinus terebinthifolius, also belonging to the Anacardiaceae family.
According to Isaac et al. (2010), there is in the wound a higher proportion of type III collagen in relation to type I, thus myofibroblasts bind collagen fibers of type III, promoting wound contraction. So, the higher the number of type III collagen fibers present, the greater the contraction of the wound. These type III collagen fibers are present, from days 3 to 5 after the injury, being progressively replaced by type I collagen fibers. At the end of 2 weeks, type I collagen fibers are prevalent.
Our study therefore showed that the group treated with the cream of “aroeira” presented a higher percentage of type I collagen fibers, from the 7th day of treatment, as shown in Fig. 2, thus promoting a process of greater tissue repair.
The chromatography analysis showed the presence of secondary metabolites, among them, catechins, derivatives of the cinnamic acid, hydrolysable and condensed tannins, in addition to dimeric chalcones. Chalcones belong to the flavonoid class, which in addition to an antioxidant activity has an anti-inflammatory effect (Zuanazzi 2010). Sousa et al. (2007) reported the anti-inflammatory and anti-ulcerogenic activities of a fraction enriched with tannin, from the trunk bark of “aroeira”. The tannins helped in the healing processes of wounds, burns and inflammations, forming a protective layer (tannin-protein complex) on epithelial tissue lesions and leading to the curative process occurring naturally (Monteiro et al. 2005).
In addition to these compounds, it is important emphasize the presence of the non-proteic amino acid, the trans-4-hydroxy-N-methylproline, in the cultivated and non-cultivated specimens of M. urundeuva. The quimic acid can be found in several species, such as Uncaria tomentosa, Aster scaber, and Saussurea triangulata. Another evidence (Akesson et al. 2005) showed that the quinic acid inhibits the activity of the NF-kB nuclear transcription factor, intimately involved with Inflammatory processes (Tak and Firestein 2001; Lawrence 2009). Recently (Aquino 2017), the anti-inflammatory effects of 4-hydroxy-N-methylproline were found, for the first time, in the species Syderoxylon obtusifolium, associated with the inhibitory actions of pro-inflammatory cytokines, TNF-alpha, and inflammatory enzymes. Therefore, these two compounds, quinic acid and trans-4-hydroxy-N-methylproline, also present in M. urundeuva, can certainly contribute to the healing actions demonstrated in the present work.
The presence of bacterial infection is able to prolong in particular the inflammatory phase, due to the production increase of pro-inflammatory principles (Guo and DiPietro 2010). Excisional wounds have greater risk of infection by providing an entrance door, especially to bacteria. If the tissue infects, the wound takes more time to heal and a strong exudate is formed as consequence of the infection (Schmidt et al. 2009).
Jandú et al. (2013), Gomes et al. (2013), and Sá et al. (2009) demonstrated the antibacterial activity of “aroeira” against gram-positive and gram-negative bacteria, mainly by the composition of their secondary metabolites that mainly involve tannins, flavonoids, and alkaloids. Others (Albuquerque et al. 2011) demonstrated that chalcones from M. urundeuva stem barks presented anti-inflammatory and antioxidant effects and drastically inhibited myeloperoxidase (inflammation marker) activity pointing them as potential candidates for the treatment of inflammatory conditions. In addition, an important neuroprotective property of a standardized extract (rich in tannins and chalcones) from M. urundeuva that was shown to be effective on a Parkinson’s disease model in rats (Calou et al. 2014). All these findings strengthen our work on the use of M. urundeuva for several purpose were inflammatory processes are present.
Conclusion
After analyzing the results obtained, the topical use of the cream of Myracrodruon urundeuva proved to be efficient in the process of wound repair in male Wistar rats. Since the treatment of chronic cutaneous wounds results in high costs and risks of complications that may delay the resolution of the healing process, this study may be used as a parameter for future translational research related to this species.
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MCT, wrote the first draft of the manuscript; MJPL, DLSJ, AESR, BSP, contributed to the execution of the experimental tests and animal’s care; PEAA, helped with the first draft of the manuscript and its submission to BJP; NCA and ERS, responsible for the preparation and chemical characterization of the extract from Myracrodruion urundeuva stem bark; LKAML, responsible for the preparation of the M. urundeuva aroeira cream; GSBV, coordinated the Project and was responsible for its final written version. All authors read and approved the final manuscript submission.
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Teixeira, M.C., Lopes, M.J.P., de Sousa-Júnior, D.L. et al. Evaluation of the Healing Potential of Myracrodruon urundeuva in Wounds Induced in Male Rats. Rev. Bras. Farmacogn. 30, 214–223 (2020). https://doi.org/10.1007/s43450-020-00025-5
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DOI: https://doi.org/10.1007/s43450-020-00025-5