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Genetics and Molecular Biology

Print version ISSN 1415-4757On-line version ISSN 1678-4685

Genet. Mol. Biol. vol.31 no.3 São Paulo  2008

http://dx.doi.org/10.1590/S1415-47572008000400023 

MUTAGENESIS
RESEARCH ARTICLE

 

Antigenotoxic effects of Mandevilla velutina (Gentianales, Apocynaceae) crude extract on cyclophosphamide-induced micronuclei in Swiss mice and urethane-induced somatic mutation and recombination in Drosophila melanogaster

 

 

Regildo Márcio Gonçalves da SilvaI; Neila Coelho de SousaI; Ulrich GrafII; Mário Antônio SpanóI

ILaboratório de Mutagênese, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil
IIInstitute of Animal Sciences, Swiss Federal Institute of Technology Zurich, Schwerzenbach, Switzerland

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ABSTRACT

A Mandevilla velutina crude extract was investigated using the mouse micronucleus test (MNT) and the Drosophila melanogaster somatic mutation and recombination test (SMART) using standard (ST) and high bioactivation (HB) crosses. The MNT used 10 mg, 20 mg or 40 mg per 100 g of body weight (bw) of extract with and without 0.2 mg per 100 g bw peritoneal cyclophosphamide. There was no genotoxicity in the negative control or extract only groups and, compared to the cyclophosphamide control, there was a significant reduction in micronucleated polychromatic erythrocytes in all the groups given extract plus cyclophosphamide. For SMART larvae were fed 5 or 10 mg mL-1 of extract for seven days with and without 0.89 mg mL-1 of urethane given on day seven. The ST and HB flies showed no significant differences in spots between the negative control and the extract only groups. The number of urethane-induced spots was reduced by the highest concentration of extract for the ST flies and by both concentrations of extract for the HB flies. The results suggest that M. velutina extract is not genotoxic but is antigenotoxic.

Key words: antigenotoxicity, genotoxicity tests, micronucleus assay, SMART, wing spot test.


 

 

Introduction

The herbaceous plant Mandevilla velutina (Mart. Ex Stadelm.) Woodson (Gentianales, Apocynaceae), a member of the dogbane family (Apocynaceae) which also includes the periwinkle genera Catharanthus and Vinca, is found in the southern Atlantic Forrest (Mata Atlântica in Portuguese) and southeastern Brazil. An infusion of the rhizomes of this plant is employed in folk medicine as a popular remedy to treat snakebites, possibly by inhibition of phospholipases A2 (PLA2), and as a general anti-inflammatory agent (Hirschmann and Dearias, 1990; Mors, 1991; Bento et al., 2003; Biondo et al., 2003).

The selective antagonism of M. velutina crude extract against bradykinin and its derivatives has been studied by various authors (Calixto et al., 1985; Calixto and Yunes, 1986; Calixto et al., 1987; Calixto and Yunes, 1990) and some active compounds in the extracts have been chemically characterized. The pregnane glycoside compounds isolated from M. velutina have been shown to be effective in antagonizing bradykinin (BK) responses in a variety of preparations and also exhibit potent and long-lasting analgesic, anti-inflammatory and anti-oedematogenic activities against a variety of inflammatory and fever-inducing phlogistic agents but was more effective in inhibiting processes involving kinins (Calixto and Yunes, 1991; Henriques et al., 1991; Maraschin et al., 2000).

Yunes et al. (1993) investigated M. velutina and isolated and purified the pregnanic steroid velutinol A, a potent anti-inflammatory agent and bradykinin antagonist which has also detected in M. velutina cell cultures (Maraschin et al., 2001). Velutinol A has also been shown to selectively block edema responses (Mattos et al., 2006a) and produces peripheral antinociceptive action in some models of acute and persistent inflammatory pain by interacting with kinin B-1-receptor mediated effects (Mattos et al., 2006b). A review summarizing recent advances in the identification and the potential therapeutic properties of non-peptide antagonists for kinin B-1 receptors is presented by Campos et al. (2006). Bento et al. (1996) used quantitative-1H-1H nuclear Overhauser enhancement (NOE) data and molecular dynamics/energy minimization calculations to show that velutinol A has the structure (15R,16R,20S) -14,16:15,20:16,21-triepoxy-15,16-seco-14β,17α-pregn-5 -ene-3β,15-dioul. More recently, detailed spectroscopic analysis has shown the structure of the potent bradykinin antagonist velutinoside A to be a pentasaccharide derivative of velutinol A, with the unusual sugars oleandrose and digitalose (Bento et al., 2003).

Bioactive triterpenoids which have been isolated from M. velutina include the bradykinin antagonist MV 8613, the anti-inflammatory agent and bradykinin antagonist MV 8612 and the lipoxygenase inhibitor MV 8608 (Brito and Brito, 1993), with the latter two compounds also having exhibited anti-inflammatory and anti-oedematogenic effects in mice (Calixto et al., 1991; Zanini et al., 1992) and inhibited PLA2-induced paw edema in rats (Neves et al., 1993). Santos et al. (2003) reported that MV8612 caused graded and complete inhibition of bradykinin-induced thermal hyperalgesia (i.e. an increased sensitivity to pain) in mice and inhibited both the neurogenic and inflammatory pain responses to formalin. In addition, Silva and Hamaguchi (1997) demonstrated that different concentrations of M. velutina crude extract are capable of reducing Trypanosoma cruzi infection in mice. These results provide strong experimental support for the beneficial use of this plant extract in folk medicine.

The wide distribution of Mandevilla and its use in folk medicine plus the lack of information on its genotoxicity or antigenotoxicity prompted us to assess the genotoxicity of M. velutina crude extract and investigate possible antigenotoxic effects of the extract on the induction of micronuclei by cyclophosphamide using the in vivo mouse bone marrow cell micronucleus test and somatic mutation and recombination induced by urethane using the Drosophila melanogaster wing spot somatic mutation and recombination test (SMART).

The micronucleus assay serves to detect the genotoxicity of chemicals through their ability to induce the formation of small membrane-bound DNA fragments (Ouanes et al., 2003), while SMART is a short-term in vivo assay for the detection of mutation, recombination, chromosome damage and/or aneugenic effects in somatic cells of D. melanogaster (Graf et al., 1984).

 

Materials and Methods

Crude chemical compounds and media

The subterranean system of Mandevilla velutina (Mart. Ex Stadelm.) Woodson consists of a xylopodium, the basal region of which is joined to a tuberous root (Appezzato-da-Glória and Estelita, 2000). We collected M. velutina tuberous roots at a site (19º09'20" S, 48º23'20" W) in the Brazilian cerrado (savanna) near the town of Uberlândia in the Brazilian state of Minas Gerais. The plants were identified by an expert plant collection. The roots were minced and extracted using an aqueous ethanol (70% w/v) solvent in the proportion of 1:10 (w:v) minced root:solvent and mechanical stirring at room temperature (24 ± 1 ºC) for 24 h, the crude extract thus obtained being filtered and lyophilized.

Mouse bone marrow micronucleus test

Antigenotoxic effects of M. velutina extract on cyclophosphamide-induced micronuclei in mice was tested using seven-week to twelve-week old male Swiss albino mice (Mus musculus Rodentia, Muridae) weighing 25-35 g purchased from an animal breeding center (Vallé, Uberlândia, MG, Brazil) and acclimatized in cages at 24 ± 1 ºC under 12 h light period for one week. During acclimatization and throughout the experiments the mice had free access to standard granulated chow and drinking water. Each cage contained five mice, which were randomly assigned to one of the four following groups: the negative control group, given distilled water by oral gavage; the positive control group, given a single intraperitoneal injection of the equivalent of 0.2 mg per 100 g of body weight (bw) of cyclophosphamide (CAS n. 50-18-0; Endoxan, Baxter Oncology Gmb, Germany), obtained from the Hospital Pharmacy of the University of Uberlândia, dissolved in distilled water; the extract group, given the equivalent of 10 mg, 20 mg or 40 mg per 100 g bw of extract each day for 7 days by oral gavage; and the experimental group, given the same treatment as for the extract group except that on the seventh day the mice also received the same treatment as the positive control group. All the mice were sacrificed by cervical dislocation on day eight. This study conforms to the relevant Brazilian guidelines regarding the ethical use of live animals. Genotoxic effects were evaluated in the mouse bone marrow by the micronucleus test (Schmid 1975). Immediately after sacrificing the mice both femurs were removed from each mouse and the bone marrow flushed out into centrifuge tubes containing 2 mL of fetal calf serum and 1000 revs min-1 for 10 min, after which the supernatant was discarded and the pellet resuspended in a drop of serum and a smear made on a clean slide. The smear was air-dried, fixed with absolute methanol for 5 min then air-dried and either stored at room temperature or directly stained for 5 min with a freshly prepared working solution of Giemsa stain diluted 1:1 v/v in 0.06 M sodium phosphate buffer and 0.06 M potassium phosphate buffer (both at pH 6.8). After staining the slides were rinsed in distilled water, dried at room temperature and scored for micronuclei according to the criteria of Krishna and Hayashi (2000) using 100X magnification and a Carl Zeiss optical microscope. We scanned 2000 polychromatic erythrocytes (PCE) per mouse and recorded the number of micronucleated PCE (MNPCE). To compare the frequencies of MNPCE and normal PCE between treated and control groups the results were expressed as mean ± standard deviation and analyzed statistically using the nonparametric Mann-Whitney U-test with the significance level set at α = 0.05. The statistical analyses was carried out using the SPSS 12.0 statistical package for PCs (SPSS, Chicago, IL).

The D. melanogaster SMART procedure

The antigenotoxic effects of M. velutina extract on urethane-induced somatic mutations in D. melanogaster were assessed by SMART for the multiple wing hairs (mwh) and flare-3 (flr3) recessive mutations. The D. melanogaster crosses used were the standard cross (ST cross) in which flr3/In(3LR)TM3, ri pp sep l(3)89Aa bx34e e BdS females were mated with mwh males (Graf et al., 1989) and the high bioactivation cross (HB cross) in which ORR; flr3/In(3LR)TM3, ri pp sep l(3)89Aa bx34e e BdS females were mated with mwh males (Graf and Singer, 1992; Graf and van Schaik, 1992). The HB cross is characterized by a high sensitivity to promutagens and procarcinogens because the ORR; flr3/TM3, BdS strain carries chromosomes 1 and 2 from a DDT-resistant Oregon R(R) line (Dapkus and Merrell, 1977) which is characterized by an increased level of cytochrome P-450 (Hällström and Blanck, 1985; Saner et al., 1996).

Both crosses produce two types of progeny phenotypically distinguished by the BdS marker, i.e., marker-heterozygous (MH) flies (mwh +/+ flr3) with phenotypically wild type wings or (ii) balancer-heterozygous (BH) flies (mwh/TM3, BdS) with phenotypically serrate wings. A Detailed analysis of genetic markers is given by Lindsley and Zimm (1992).

Eggs were collected from both crosses during 8 h in culture bottles with an agar-agar base (4% w/v) and a thick layer of live yeast supplemented with sucrose. Third instar (72 ± 4 h) larvae were washed out of these bottles with tap water and collected in a stainless steel strainer. Batches of equal numbers of larvae were placed in glass vials containing 1.5 g of drosophila instant medium formula 4-24 (Carolina Biological Supply, Burlington, NC, USA) rehydrated with 5 mL of a solution containing a final concentration of 5 mg mL-1 or 10 mg mL-1 of M. velutina extract alone or combined with urethane (CAS Nº 51-79-6; Fluka AG, Switzerland) at a final concentration of 0.89 mg mL-1, this chemical being a well-known promutagen which is metabolically activated by the cytochrome P-450 enzyme system. Negative (distilled water) and positive (0.89 mg mL-1 urethane) controls were included in both experiments. Larvae were allowed to feed on the medium for the remainder of their larval life (~ 48 h). The experiments were carried out at 25 ºC and 65% relative humidity.

The hatched adult flies were killed by placing in 70% (v/v) aqueous ethanol, in which they remained until needed for analysis. For analysis, wings of the MH flies were removed, mounted on glass slides with Faure's solution (30 g gum Arabic, 20 mL glycerol, 50 g chloral hydrate and 50 mL water) and examined for spots using a compound microscope at 400X magnification. The data were evaluated according to the procedure described by Frei and Würgler (1988, 1995) for the occurrence of single spots (mwh or flr) and twin spots (mwh clone adjacent to flr clone). The different types of spots are due to different genotoxic mechanisms, i.e., mutational events (deletions, point mutation, specific types of chromosome aberrations, etc.), mitotic recombination or, sometimes, monosomy (Graf et al., 1984; Guzmán-Rincón and Graf, 1995).

The frequencies of spots per fly were compared to the concurrent control series according to Frei and Würgler (1988, 1995). Statistical comparisons were made using the Kastenbaum and Bowman (1970) test for proportions and followed a multiple-decision procedure according to Frei and Würgler (1988). For the final statistical analysis of all positive outcomes, the non-parametric Mann-Whitney U-test with significance levels α = β = 0.05 was used in order to exclude false positives (Frei and Würgler, 1995).

 

Results

Micronucleus test

The frequency of MNPCE ± the standard deviation (SD), for male Swiss albino mice in the distilled water negative control group was 4 ± 0.71, while for three groups of mice treated with the equivalent of 10 mg, 20 mg or 40 mg per 100 g bw of extract the frequency of MNPCE was 5.4 ± 2.68 for the 10 mg group, 0.7 ± 1.14 for the 20 mg group and 2.3 ± 2.51 for the 40 mg group. The negative control group and the extract groups were not significantly different by the Mann-Whitney U-test at p > 0.4 (Table 1).

 

 

For the cyclophosphamide positive control group the frequency of MNPCE was 25 ± 6.96, which was significantly higher (U-test, p < 0.05) when compared with the negative control group or the extract groups (Table 1). For the experimental groups pre-treated with the equivalent of 10 mg, 20 mg or 40 mg per 100 g bw of extract and then given cyclophosphamide we found that all the groups showed significantly lower frequencies of MNPCE as compared to the cyclophosphamide positive control group, the frequencies of MNPCE were 6.7 ± 5.32 for the 10 mg group, 2.6 ± 2.77 for the 20 mg group and 5.1 ± 1.64 for the 40 mg group (Table 1).

Somatic Mutation And Recombination Test (SMART)

In the wing spot test, no statistically significant differences were found between the results of the two repeated experiments. The pooled data recorded in the marker-heterozygous (MH) flies are shown in Table 2 and demonstrate that no statistically significant differences in spot frequencies were observed for either the standard (ST) or the high bioactivation (HB) cross after chronic treatment of larvae with 5 mg mL-1 or 10 mg mL-1 of extract, indicating that under these experimental conditions the extract showed no genotoxic or antigenotoxic effects on spontaneous DNA lesions.

 

 

The mean total spot frequencies per fly was 0.60 in the HB cross negative control group and 0.67 in the ST cross negative control group, both values being within the normally observed range. However, the frequencies of spontaneous spots normally observed in HB crosses are usually slightly higher than those observed in the ST cross (Graf and van Schaik, 1992; Lehmann et al., 2000; Cunha et al., 2001). Compared to the negative control group, urethane induced a statistically significant number of small single spots and large single spots in the ST cross and in all three categories of spots with the HB cross and demonstrated a high bioactivation effect, with 2.4 spots per fly in the ST cross vs. 10.2 spots per fly in the HB cross. After chronic treatment of the ST cross larvae with different concentrations of extract only there were no statistically significant differences in any of the three categories of spot frequencies in the adult flies (Table 2). However, for ST cross larvae grown on media supplemented with 10 mg mL-1 of extract plus 0.89 mg mL-1 of urethane there was a statistically significant reduction in the total spots recorded on adult flies as compared to the number of spots seen on adult flies the larvae of which had been exposed to urethane only. For the HB cross, for both concentrations of M velutina extract there was a significant reduction in all three categories of urethane-induced spots and in the total urethane-induced spots seen on adult flies.

The spot size distributions for the negative control group, the extract only group, the urethane only group and the extract plus urethane group are presented in Figures 1A and 1B, which clearly show that the extract was not genotoxic under our experimental conditions. In contrast, after chronic treatment with urethane alone or urethane plus extract there was a predominance of small single spots, with the frequency of larger spots decreasing with increasing spot size. These data are in line with those reported with bleomycin, diethylnitrosamine and procarbazine (Graf et al., 1984), cyclophosphamide (Spanó et al., 2001) and a phytotherapeutic extract from Stryphnodendron adstringes (Mart.) Coville (Sousa et al., 2003).

 


 

Discussion

Evaluation of micronucleus induction is the primary in vivo test in a battery of genotoxicity tests and is recommended by regulatory agencies around the globe as part of product safety assessment. The assay, when performed correctly, detects both clastogenic and aneugenic effects (Krishna and Hayashi, 2000). Micronuclei in young erythrocytes arise primarily from acentric fragments or chromosomes that are unable to migrate and follow the mitotic spindle during cell division in erythropoietic blast cells (Salamone and Heddle, 1983; Ouanes et al., 2003), an increase in the MNPCE frequency being an indication of induced chromosome damage (Krishna and Hayashi, 2000). In our experiments, we found that the MNPCE frequency in the groups treated with the three different extract concentrations was not significantly different from the frequency seen in the negative control group. Cyclophosphamide has been widely used as a positive control in rodent micronucleus assay (Krishna and Hayashi, 2000) and, in our experiments, showed a statistically significant induction of MNPCE. However, we also found that all concentrations of the extract prevented significant induction of MNPCE by cyclophosphamide. Taken together, these results indicate that the extract was not genotoxic under the conditions of this assay but does contain components that exert an antigenotoxic effect on cyclophosphamide-induced DNA lesions.

In the SMART the genotoxicity and antigenotoxicity of the extract was investigated in somatic cells of the D. melanogaster imaginal disk by feeding larvae derived from both ST and HB crosses on media containing different concentrations of the extract. The HB cross results in constitutively increased cytochrome P-450-dependent enzyme activities and therefore make the wing spot test more sensitive for the detection of promutagens and procarcinogens (Graf and Singer, 1992; Graf and van Schaik, 1992). Urethane, a promutagen which can occur naturally in some fermented food (Ough, 1976), was used as positive control because it has a clear genotoxic potential in Drosophila, with a clear dose response and dependence on metabolic activation. The metabolic pathway most probably involves cytochrome P-450-dependent enzyme activities (Frölich and Würgler, 1990).

The SMART data showed that at the concentrations tested the extract did not induce somatic mutation and recombination in the D. melanogaster ST or HB crosses. As expected, when compared to the negative control group, urethane not only showed a statistically significant induction of small single spots and large single spots in the ST cross and in all three categories of spots for the HB cross but also showed a high bioactivation effect. When compared to the positive control, chronic co-treatment of ST larvae with different concentrations of extract plus urethane produced no statistically significant differences for any of the three spot frequency categories but, however, there was a statistically significant reduction in total spots for ST flies originating from larvae in the group fed on media supplemented with 10 mg mL-1 of extract plus urethane. Furthermore, with the HB cross there was a statistically significant reduction in all three categories of spots and in total spots for flies emerging from larvae treated with both concentrations of extract plus urethane. These results indicate that the extract acts as an antigenotoxic on urethane-induced DNA lesions and suggests that components of the extract interact with cytochrome P-450 leading to a reduction in the formation of the active urethane metabolite that provides genomic instability.

Our results are in line with those of Idaomar et al. (2002), who reported the results of a D. melanogaster wing spot test which showed that essential oils extracted from the medicinal plants Helichrysum italicum, Ledum groenlandicum and Ravensara aromatica produced an antimutagenic effect against urethane and that this could be explained by the interaction of constituents of these plants with the cytochrome P-450 activation system leading to a reduction of the formation of the active urethane metabolite. The effect could also be attributed to certain molecules that are involved in these oils. El Hamss et al. (2003) described the modulating action of bell pepper (Capsicum annuum) and black pepper (Piper nigrum) on the effects of the alkylating agent methyl methanesulfonate and the promutagen urethane when investigated using a D. melanogaster wing spot test. These authors concluding that suppression of metabolic activation or interaction with the active groups of mutagens could be mechanisms by which these spices exert their antimutagenic activity. Kuroda et al. (1992) has suggested that in co-treatments an antimutagen can act as a desmutagen which can chemically or enzymatically inactivate a mutagen or inhibit the metabolic activation of promutagen.

It has been reported that M. velutina contains bioactive triterpenoids (Calixto and Yunes, 1991; Maraschin et al., 2000) which include velutinol A (Yunes et al., 1993) and the active terpenes MV 8608, MV 8612 and MV 8613 (Brito and Brito, 1993), while Bento et al. (2003) has also reported a pentasaccharide derivative of velutinol A called velutinoside A. Nevertheless, there is still a lack of information on the genotoxic and antigenotoxic properties of compounds extracted from M. velutina.

The in vivo rodent micronucleus assay has been widely used to detect genotoxicity (Krishna and Hayashi, 2000; Villani et al., 2007; Doppalapudi et al., 2007) and the somatic mutation and recombination tests in D. melanogaster are versatile and sensitive in vivo eukaryotic systems for the determination of genotoxic and antigenotoxic activity of chemical compounds and complex mixtures (Graf et al., 1998; Idaomar et al., 2002; Silva et al., 2006; Fragiorge et al., 2007; Pantaleão et al., 2007; Téllez et al., 2007).

Our study shows that in the mouse micronucleus test M. velutina crude extract was non-clastogenic because it did not induce chromosome breakage and was non-aneugenic since it did not affect spindle fiber function, while the D. melanogaster SMART data showed that the extract did not induce somatic mutation or recombination. Furthermore, the results show that the extract has antigenotoxic effects on cyclophosphamide-induced lesions in mice and urethane-induced DNA lesions in D. melanogaster. In addition, the SMART results indicate that the action of the extract may involve the interaction of constituents of the extract with cytochrome P-450, but, however, the exact mechanisms are not well understood due to the limited data reported in the literature with respect to the inhibitory effects of these constituents. The results of our study show that the in vivo rodent micronucleus test and the D. melanogaster SMART are versatile and sensitive in vivo eukaryotic systems for the determination of non-genotoxic and antigenotoxic activity of M. velutina extract. However, further studies are needed to elucidate the precise mechanisms involved in the antigenotoxic activity of M. velutina extract, with such studies including not only the investigation of different concentrations of M. velutina crude extract but also the main constituents of the extract.

 

Acknowledgments

This work was partially supported by the Brazilian agencies CNPq, CAPES, FAPEMIG and UFU.

 

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Send correspondence to:
Mário Antônio Spanó
Laboratório de Mutagênese, Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia
Campus Umuarama, Bloco D, Sala 2D-52
38400-902 Uberlândia, MG, Brazil
E-mail: maspano@ufu.br

Received: September 20, 2007; Accepted: November 8, 2007.

 

 

Associate Editor: Carlos F.M. Menck

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