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versión impresa ISSN 1984-8250
Braz. J. Pharm. Sci. vol.47 no.4 São Paulo oct./dic. 2011
Marcelia Garcez Dória de MeloI; Adriano Antunes de Souza AraújoI, *; Mairim Russo SerafiniI; Larissa Feitosa CarvalhoI; Marília Santos BezerraI; Cledison Santos RamosI; Leonardo Rigoldi BonjardimI; Ricardo Luiz Cavalcanti Albuquerque-JúniorII; Julianeli Tolentino LimaIII; Rosana Souza SiqueiraIV; Vanessa Silveira FortesIV; Maria José Vieira FonsecaIV; Lucindo José Quintans-JúniorI
IDepartamento de Fisiologia, Universidade Federal de Sergipe
IILaboratório de Morfologia e Biologia Estrutural, Universidade Tiradentes
IIINúcleo de Estudos e Pesquisas de Plantas Medicinais, Universidade Federal do Vale do São Francisco
IVFaculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo
Atranorin (ATR) is the main compound from the lichen Cladina kalbii Ahti, which grows in the arid regions of northeastern Brazil. This study was conducted to evaluate the anti-inflammatory and toxicological properties of ATR. To evaluate anti-inflammatory properties, paw edema was induced by injecting 0.1 mL of carrageenan into the subplantar region of the right hind paw of rats, and leukocyte migration was induced by injection of 500 µL of carrageenan into the peritoneal cavity of mice. In addition, we determined ATR cytotoxicity in L929 cells by MTT assay and acute (5 g/kg-single dose) and subchronic (50 mg/kg-30 days) toxicity tests in Wistar rats. The results showed that ATR (100 mg/kg and 200 mg/kg) exhibited significant anti-inflammatory activity (paw edema and leukocyte migration). In the acute toxicity test, the animals showed hypoactivity and lethargy during the initial period (first 6 hours) and increase in total protein, total and indirect bilirubin, and alkaline phosphatase after 14 days in ATR-treated male rats. The subchronic toxicity test revealed increases in total protein, globulin, gamma-glutamyl transferase, alkaline phosphatase, and total and direct bilirubin in ATR-treated female rats. Histological analysis revealed no changes in the architecture and morphology of the organs. These results suggest that ATR has significant anti-inflammatory activity, with no significant acute and subchronic toxicity or cytotoxicity.
Uniterms: Cladina kalbii/pharmacognosy. Atranorin/anti-inflamatory activity. Atranorin/toxicity. Medicinal plants.
Atranorina (ATR) é o principal composto do líquen Cladina kalbii Ahti, que cresce em terras áridas do nordeste brasileiro. Este estudo foi realizado para avaliar as propriedades antiinflamatórias e toxicológicas da ATR. Para avaliar as propriedades antiinflamatórias, o edema de pata foi induzido, administrando-se 0,1 mL de carragenina na região subplantar da pata traseira direita e a migração leucocitária foi induzida pela injeção de 500 µL de carragenina no peritônio. Além disso, determinou-se a citotoxicidade da ATR, utilizando-se a linhagem celular L929, através do teste de MTT e dos testes de toxicidade aguda (5 g/kg - dose única) e subcrônica (50 mg/kg-30 dias) em ratos Wistar. Os resultados mostraram que nas doses de (100 mg/kg e 200 mg/kg) a ATR exibiu atividade antiinflamatória significativa nos ensaios de edema de pata e migração leucocitária. Nos testes de toxicidade aguda, os animais apresentaram hipoatividade e letargia no período inicial (primeiras 6 horas) e aumento das proteínas totais, bilirrubinas total e indireta e fosfatase alcalina depois de 14 dias nos machos tratados. Para o ensaio subcrônico, houve aumento das proteínas totais, gama-glutamil-transferase, fosfatase alcalina e bilirrubina total e direta nas fêmeas tratadas com ATR. Não foram encontradas alterações na arquitetura e morfologia das lâminas histológicas observadas. Esses resultados sugerem que a ATR apresenta atividade antiinflamatória significativa, sem apresentar significativa toxicidade aguda, subcrônica e citotoxicidade.
Unitermos: Cladina kalbii/farmacognosia. Atranorina/atividade antiinflamatória. Atranorina/toxicidade. Plantas medicinais.
Lichens are some of the most important sources of biologically active compounds (Barnes et al., 2000). They have a worldwide distribution and live in a symbiotic relationship with fungi (mycobiont), algae (phycobiont), and/or cyanobacteria (photobiont) (Honegger, 1991). This symbiosis provides physical protection, water, and mineral supply for both partners. They produce common intracellular constituents, including proteins, amino acids, polyols, carotenoids, polysaccharides, and vitamins. The secondary metabolites found in lichens are phenolics that accumulate either in the cortex or in the cell walls of medullary hyphae, and they are mainly acetyl-polymalonyl pathway derivatives (Honda, Vilegas, 1999). Furthermore, lichens are able to synthesize several metabolites, which are composed of aliphatic, cycloaliphatic, aromatic, and terpenic compounds (Huneck, 1999).
Polysaccharides, proteins, and secondary metabolites produced by lichens have attracted the attention of investigators due to their biological activities. For centuries, a number of the 17,000 known lichen species have been used by humans for medicinal purposes. In the northeastern region of Brazil, lichen species vary according to the environment, from the coastal zone (humid) to the inner region, where the climate is semi-arid (caatinga). In these habitats, several species are considered to be bioactive (Maia et al., 2002; Pereira, 1996). Atranorin (ATR) (Figure 1) is the main compound from the lichen Cladina kalbii Ahti, which grows in the arid regions of northeastern Brazil. ATR is an important member of the depside group. The molecular structures of these depsides present aromatic esters with a methyl ester terminal group (Howell et al., 2003).
Studies on the pharmacological properties of C. kalbii and its constituents have revealed antinociceptive effects (Pereira, 1996; Maia et al., 2002), antimicrobial action against Staphylococcus aureus and Bacillus subtilis (Falcão et al., 2004; Ribeiro et al., 2002), and photoprotection capacity (Fernandez et al., 1998) as well as antioxidant activity (Hidalgo et al., 1994). Additionally, a recent report has demonstrated the antinociceptive property of ATR in mice (Melo, 2008; Siqueira et al., 2010). Despite the widespread medicinal use of C. kalbii root extracts in Brazil and elsewhere, there are no published studies on their toxicological and anti-inflammatory properties.
This study aimed to evaluate the anti-inflammatory activity, cytotoxicity, and toxic effects of acute (single dose) and subchronic (30 days) oral administration of ATR extracted from C. kalbii in rodents.
MATERIAL AND METHODS
C. kalbii was collected in March 2007 in Itabaiana, State of Sergipe, Northeastern Brazil (10º44'S, 37º23'W), and identified by M.P. Marcelli (Botanical Institute of São Paulo-SP, Brazil). SP 393235.
Extraction and isolation of ATR
ATR (C19H18O8) was isolated from the crude extract of the lichen C. kalbii. The air-dried parts (100 g) of C. kalbii were extracted with 150 mL of chloroform using a Soxhlet apparatus to isolate ATR. The crude extract was filtered and stored at 4 °C for 24 h for ATR precipitation.
Male and female Wistar rats (150-200 g) and male Swiss mice (28-32 g) were obtained from Universidade Federal de Sergipe, Brazil. Toxicity tests were performed in male and female rats and anti-inflammatory tests were performed only in male rats or mice. The animals were kept under standard laboratory conditions (20±2 ºC) and housed in polypropylene cages, with food and water ad libitum. All experimental protocols were approved by the Institutional Animal Care and Use Committee of Universidade Federal de Sergipe (CEPA/UFS 100/2006). All experiments were performed from 1:00 p.m. to 6:00 p.m.
Carrageenan-induced hind paw edema in rats
Acute hind paw edema was induced in male rats by injecting 0.1 mL of carrageenan (prepared as 1% suspension in sterile normal saline) into the subplantar region of the right hind paw (Winter et al., 1962). ATR (50, 100, and 200 mg/kg, p.o.) was administered to three different groups, while two other groups served as negative and positive controls and received vehicle (0.9% saline with two drops of 0.2% Tween 80, a solvent for ATR) and standard drug (aspirin, 300 mg/kg, p.o.), respectively. ATR and aspirin were administered 1 h prior to the injection of carrageenan. The rat pedal volume up to the ankle joint was measured using a plethysmometer (Model LE 7500 Panlab, Barcelona, Spain) at 3 h after the injection of carrageenan.
Leukocyte migration to the peritoneal cavity
Leukocyte migration was induced by injection of 500 µL of carrageenan (500 µg/cavity, i.p.) into the peritoneal cavity of male mice 1 h after administration of ATR (50, 100, and 200 mg/kg, p.o.), vehicle (0.9% saline with two drops of 0.2% Tween 80), or dexamethasone (2 mg/kg, s.c., n = 6) by a modification of the technique previously described by Bastos et al. (2007). Mice were euthanized by cervical dislocation 4 h after carrageenan injection. Shortly after, phosphate-buffered saline (PBS) containing EDTA (1 mM, i.p., 10 mL) was injected. Immediately after, the abdomen was briefly massaged for further fluid collection, which was centrifuged (2000 rpm, 5 min) at room temperature. The supernatant was disposed and 1 mL of PBS was added to the precipitate. A 10-µL aliquot of this suspension was diluted in 200 µL of Turk solution, and total cells were counted in a Neubauer chamber under optical microscopy. The results were expressed as the number of leukocytes/mL. The percentage of leukocyte inhibition (%LI) was calculated as follows: %LI = (1 - T/C) x 100, where T represents the test groups' leukocyte counts, and C represents the control groups' leukocyte counts.
Subchronic toxicity study
Toxicological assays were performed with 20 male and 20 female rats, divided into 4 groups of 10 animals each (experimental and control groups of male and female rats) (BRASIL, 2004). For the subchronic study, daily doses of ATR (50 mg/kg) dissolved in saline with 0.2% Tween 80 (vehicle) were administered to the experimental groups over a 30-day period, whereas the controls received only saline.
At the end of the experimental period, and after a 12 h fast, the animals were anesthetized with thiopental (50 mg/kg) and blood (3-5 mL) was collected from the abdominal aorta. Subsequently, the animals were sacrificed (hemorrhagic shock) and a detailed study of the gross and microscopic features of internal organs as well as hematological and biochemical analyses of blood were carried out. The position, shape, size, texture, consistency, and color of internal organs (lungs, heart, liver, viscera, and kidneys) were macroscopically examined for any signs of gross changes. These organs were then collected, weighed to determine relative organ weights, and fixed in 10% phosphate-buffered formalin solution for subsequent histological procedures.
Acute toxicity study
Toxicological assays were performed with 12 male and 12 female rats, divided into 4 groups of 6 animals each (experimental and control groups of male and female rats) (BRASIL, 2004). The animals received 5 g/kg of ATR by oral administration (gavage). ATR, dissolved in saline with 0.2% Tween 80 (vehicle), was administered to the experimental groups, whereas the controls received only saline.
Specific behaviors (sedation, reduced ambulation, response to touch, analgesia, and defecation) were observed and graded according to Almeida et al. (1999) at 1, 2, 3, and 4 h after gavage. Finally, the animals were monitored daily for 14 days to verify lethality. At the end of the experimental period, and after a 12 h fast, the animals were anesthetized with thiopental and blood was collected from the abdominal aorta. Subsequently, the animals were sacrificed (hemorrhagic shock) and a detailed study of the gross and microscopic features of internal organs as well as hematological and biochemical analyses of blood were carried out. The position, shape, size, texture, consistency, and color of internal organs (lungs, heart, liver, viscera, brain, and kidneys) were macroscopically examined for any signs of gross changes. These organs were then collected, weighed to determine relative organ weights, and fixed in 10% phosphate-buffered formalin solution for subsequent histological procedures.
Blood samples were collected into EDTA tubes. Measurements of erythrocytes, hemoglobin, hematocrit, leukocyte, neutrophil, lymphocyte, eosinophil, monocyte, basophil, atypical lymphocyte, and platelets were determined using Pentra-120 (ABX-HORIBA) automated equipment according to the method described by Morris and Davey (1999).
Serum was separated from non-heparinized blood and assayed for serum urea, creatinine, total protein, globulin, albumin, aspartate aminotransferase (AST), alanine aminotransferase (ALT), gamma-glutamyl transferase (GGT), total bilirubin (TBIL), direct bilirubin (DBIL), alkaline phosphatase (ALP), lactate dehydrogenase (LDH), calcium, sodium, potassium, and uric acid. Biochemical parameters were determined using Dade Behring Dimension RxL automated equipment.
Formalin-fixed samples of internal organs were dehydrated, cleared, and embedded in paraffin according to standard histological procedures. Then, 5 µ-thick sections of paraffin-embedded tissues were obtained and stained with hematoxylin-eosin. Morphological analysis of the histological sections was performed by light microscopy in a blinded fashion, following a numerical protocol so that the pathologist was blinded to treatment groups until the end of the experiment. Morphometric analysis was used to compare mean kidney glomerular perimeter between female rats (control and test groups). The images were digitized using 5 histological fields for each case (200x magnification), employing an Olympus image capture system. The digital images were then processed using specific morphometry software (Image Tool 3.0).
Determination of cytotoxicity
L929 cells (fibroblast cells) from the Rio de Janeiro Cell Bank, University of Rio de Janeiro, Rio de Janeiro, Brazil, were routinely grown in 150 cm2 tissue culture flasks in DMEM supplemented with 1% (v/v) of an antibiotic solution containing 5 mg of penicillin, 5 mg of streptomycin and 10 mg of neomycin per mL, and 7.5% or 10.0% (v/v) heat-inactivated fetal bovine serum at 37ºC under 5% CO2.
Cell sensitivity to ATR was determined by standard spectrophotometric 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Cells were seeded at a density of 105 cells/well into 96-well plates and incubated for 24 h at 37ºC in a 95% air, 5% CO2 atmosphere. Then, 20 µL of ATR at different concentrations in PBS was added to the culture plates for 24 h. After treatment, cells were rinsed once with PBS. Serum-free culture medium, without phenol red, was added back to all wells. Cells were then incubated for 4 h with MTT solution (5 mg/mL). The yellow tetrazolium salt was metabolized by viable cells to form purple formazan crystals. The crystals were solubilized overnight (12 h) in a mixture consisting of 20% sodium dodecyl sulfate (SDS) in HCl (0.01 M). The product was quantified spectrophotometrically by measuring absorbance at 570 nm using a microplate reader (µQuantTM, BioTek Instruments Inc., USA). Cell viability was expressed as the percentage of viable cells in relation to the control cells.
The Student t test was employed in the statistical analysis of the results (Origin 6.2 or GraphPad Prism 4.01). Data obtained from the anti-inflammatory study were evaluated by one-way analysis of variance (ANOVA), followed by Dunnett's or Fisher's tests. All values were expressed as back-transformed mean ± standard deviation (SD). Differences between groups were considered statistically significant at p < 0.05.
RESULTS AND DISCUSSION
The mean increase in paw edema volume was about 0.82±0.17 mL in vehicle-treated rats. ATR (100 and 200 mg/kg, p.o.) significantly reduced (p < 0.05) mean paw edema volume (29.3 and 32.9%, respectively), as compared with the control group, at 3 h after carrageenan injection. Similarly, aspirin (300 mg/kg, p.o.) showed highly significant (p < 0.001) anti-inflammatory activity, with a 76.4% inhibition rate (Table I).
Several mediators are released by carrageenan in the rat paw. The initial phase of the response to carrageenan may be due to the release of histamine and serotonin, whereas kinins may play a role in the middle phase (Di Rosa, Sorrentino, 1968), and prostaglandins may be the most important mediators in the final 3-5 h of the post-carrageenan response (Vinegar et al., 1969). Bugni et al. (2009) showed that part of the antinociceptive effect obtained with ATR may be due to inhibition of cyclooxygenase (COX) enzymes. Additionally, Siqueira et al. (2010) suggested that ATR modulates neurogenic and inflammatory pain in capsaicin- and formalin-induced orofacial pain test models through a naloxone-sensitive mechanism.
Figure 2 shows the inhibitory effect of ATR on carrageenan-induced leukocyte migration into the peritoneal cavity 4 h after stimulus at all doses (31.9, 35.9, and 42.5% at doses of 50, 100, and 200 mg/kg, respectively; p < 0.05). The results obtained with the control group support the effect of ATR, since the vehicle showed no activity and the control drug (dexamethasone, 2 mg/kg, s.c.) inhibited leukocyte migration (92.2%, p < 0.001), as compared with the control group.
Cell recruitment during inflammation depends on the orchestrated release of local mediators responsible for local vascular and tissue changes as well as for the recruitment of host defense cells (Luster et al., 2005). Inflammation induced by carrageenan involves cell migration, plasma exudation, and production of chemical mediators, such as nitric oxide, prostaglandin E2, interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α (Salvemini et al., 1996; Loram et al., 2007). Those mediators are able to recruit leukocytes, such as neutrophils, as demonstrated in several experimental models.
Kumar and Muller (1999) demonstrated that ATR effectively inhibits the biosynthesis of leukotriene B4 in bovine polymorphonuclear leukocytes, which could also lead to an anti-inflammatory effect. Because ATR inhibited carrageenan-induced paw edema volume and leukocyte migration, it may be suggested that these activities are related to inhibition of the synthesis of many inflammatory mediators, whose involvement in cell migration is well established.
Subchronic toxicity study
Administration of ATR (50 mg/kg, p.o.) for 30 days did not modify the profile of weight gain when test and control groups were compared (Figure 3). In addition, food and water consumption for control and treated animals was kept within the established limits for this animal species.
There were no changes in the weight of lungs, heart, liver, and stomach (Table II) 30 days after subchronic treatment with 50-mg/kg ATR. The internal organs of both control and treated animals showed no unusual signs. Moreover, both macro and microscopic analyses revealed normal findings. The organs of both control and treated groups were unremarkable and comparable to each sex. There was no further evidence of histopathological changes. The architecture and cell appearance of the examined internal organs were comparatively unremarkable in both groups and sexes. Only the female rats showed significant differences in the relative weight of the kidneys, as shown in Table II.
Thus, a morphometric analysis was performed in the kidney glomerular cells, which showed no significant differences when compared to test and control groups. Scientific literature on the renal histology and morphometry of animals treated with lichens is still rare. The differences in kidney weights could suggest a renal reduction in the area of glomerular corpuscle and capsular space (Daniels,
Hostetter, 1990). However, gross and microscopic pathologic examination of the kidneys detected no abnormalities. Also, the values observed for kidney weight are consistent with the limits considered normal for this animal species, according to Hossne et al. (1986).
Results of the hematological study are presented in Table III. The data show that hemoglobin, hematocrit, leukocyte, neutrophil, lymphocyte, eosinophil, monocyte, basophil, atypical lymphocyte, and platelet levels for the control rats were not significantly different from those of ATR-treated rats during the study period (Table III). Only erythrocyte counts were significantly lower in treated males 30 days after treatment, as compared to the control group (p < 0.05). However, these values could be considered normal because, according to Schalm (1986), the number of erythrocytes may range from 5.25 to 8.5 million in male rats. Furthermore, these values are also in agreement with the reference values for rats in the university vivarium (these reference values were determined in a recent survey, but such data are not yet published).
The increase in erythrocytes may be due to overproduction of hematopoietic regulatory elements, such as colony-stimulating factors, erythropoietin, and thrombopoietin, by stromal cells and macrophages in the bone marrow (Chang-Gue et al., 2003), thus providing a local environment for hematopoiesis (Udut et al., 2005). In addition, the fact that such a significant difference was not verified between the female groups supports the idea that this finding is merely contingent.
Plasma biochemical data are described in Table IV. No significant changes were observed in urea, creatinine, albumin, AST, ALT, LDH, calcium, sodium, potassium, and uric acid. Nevertheless, the study showed an increase in total protein and globulin, demonstrating that liver function was preserved (Motta, 2003). Furthermore, the increase in GGT, DBIL, and ALP revealed biliary cholestasis (Henry, 2008), probably due to an incipient inflammatory process.
The histopathological examination of selected organs (lungs, heart, liver, viscera, and kidneys) from treated and control animals showed normal architecture, suggesting that daily oral administration of ATR for 30 days caused no detrimental changes or morphological disturbances.
Acute toxicity study
In the acute toxicity test, doses of 5 g/kg of ATR caused no deaths in rats during a 14-day observation period. The rats showed no signs of toxicity or changes in general behavior or any other physiological activities. Except for reduced locomotor activity ('hypoactivity') and lethargy, observed within the first 24 hours of ATR administration (at a single dose of 5 g/kg), no other signs of toxicity were noted in rats treated with oral ATR. Figure 4 shows a graphical representation of changes in body weight following the treatment of rats with ATR and saline. There was a significant increase (p < 0.05) in body weight over the experimental period for all treatment groups.,
As shown in Table V, organ weights (lung, heart, liver, viscera, and brain) of ATR-treated rats did not differ from those of the control group.
Hematological analysis in the acute study (Table VI) showed no significant differences in the parameters examined in control or treated animals of both sexes. At a dose of 5 g/kg (single dose), only the male group showed a significant decrease in lymphocyte (%), as compared with the corresponding control group. In contrast, there was no significant change in any of the differential lymphocyte counts in female rats. Moreover, the difference noted in lymphocyte count between groups is within the reference values given by Mitruka and Rawnsley (1981), 65-84.5%, suggesting the absence of clinically relevant alterations.
The biochemical profile of treated and control rats is presented in Table VII. Acute oral administration of ATR (5 g/kg-single dose) only altered bilirubin levels, with no significant changes in serum urea, creatinine, globulin, AST, ALT, GGT, DHL, calcium, potassium, and uric acid. Because of a significant increase in TBIL and DBIL alone, it may be suggested that a reduction in conjugation rate occurs within the hepatocyte (Henry, 2008). Altered ALP and sodium levels in the male group were considered normal, since they are in agreement with the reference values for rats in the university vivarium. In addition, no abnormalities or further evidence of histopathological changes were found in any of control or treated rats of both sexes.
Gross pathologic examination of the tissues detected no abnormality in weight or appearance between control and experimental groups. Moreover, the organs of both groups were unremarkable and comparable to each sex. Microscopic analysis revealed that the architecture and cell appearance of the internal organs were comparatively unremarkable in both groups and sexes. These findings indicate that oral administration of purified ATR extracted from C. kalbii promotes no morphological changes in the vital organs of animals and suggest that this substance provides no toxicological effects.
Determination of cytotoxicity
MTT is a water-soluble tetrazolium salt, which is converted to an insoluble purple formazan product by cleavage of the tetrazolium ring by succinate dehydrogenase activity within the mitochondria. The formazan product is impermeable to cell membranes and therefore accumulates in healthy cells (Fotakis, Timbrell, 2006).
ATR was evaluated in a mouse fibroblast cell line (L929) in order to examine its cytotoxic effects on normal cells. ATR cytotoxicity on the growth of L929 cells is shown in Figure 5. Cell proliferation was analyzed 24 h after L929 cells had been cultured with ATR at 0.01, 0.02, 0.04, 0.08, and 0.16 mg/mL using MTT assay. ATR at concentrations of 0.01-0.16 mg/mL did not show cytotoxic effects on the L929 cell line. These results suggest that ATR has no cytotoxic effects at these concentrations. Melo et al. (2011) reported an effect of ATR on SH-SY5Y cultures, a neuroblastoma-derived catecholaminergic cell line.
Different concentrations of ATR alone had no effect on cell viability, as assessed by MTT assay. When cells are treated with H2O2, there is a significant decrease in cell viability to 40% of control levels. Co-incubation with ATR protects SH-SY5Y cells against the cytotoxic effects of H2O2. Nonetheless, all ATR concentrations reversed the effect of H2O2 (Melo et al., 2011).
In summary, data from the present study indicated that ATR has anti-inflammatory properties, but further studies are necessary to establish its correct mechanism of action. It is possible to speculate about the inhibition of the synthesis of many inflammatory mediators involved in cell migration. Additionally, there were no relevant signs or significant changes in hematological, biochemical, and histopathological parameters resulting from the long-term administration of ATR. It is therefore concluded that ATR, at the doses used in this study, produced no remarkable toxic effects on rats and might be an important tool in the management and/or treatment of inflammatory disorders.
We would like to thank the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq/Brazil) and the Foundation for Research Support of the State of Sergipe (Fundação de Amparo à Pesquisa do Estado de Sergipe/FAPITEC-SE) for the financial support.
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Received for publication on 11th November 2011
Accepted for publication on 06th June 2011
* Correspondence: A. A. S. Araújo. Departamento de Fisiologia, Universidade Federal de Sergipe - UFS. Av. Marechal Rondom, s/n, 49000-100 - São Cristóvão - Sergipe-Brazil. Tel.: +55-79-32126640; fax: +55-79-32126640. E-mail: email@example.com