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Chemical Composition, Antioxidant, Genotoxique and Antigenotoxic Potentials of Phlomis Bovei De Noé Aerial Parts.

In the present work, chemical investigation of the aerial parts of Phlomis bovei de Noé an endemic species from Algeria, led to the isolation and identification of seven known compounds including five flavones glycosides: Chrysoeriol 7-O-(3’’-(E et Z)-p-coumaroyl)-β-glucoside (1), terniflorin (apigenin-7-O-(6’’-E-p-coumaroyl)glucoside) (3), apigenin-7-O-(6’’-(5’’’-methoxy-coumaryl) glucoside (4), apigenin 7-O-(3″-p-coumaryl)glucoside (5), hispidulin-7-O-glucuronide (6) and two cinnamic acid derivatives: p-coumaric acid methyl ester (E et Z) (2), chlorogenic acid (7). Compound 4 is described for the first time in the species bovei de Noé, the genus Phlomis and the Lamiaceae family. Structures elucidation was performed by comprehensive 1D and 2D NMR analyses, mass spectrometry and by comparison with literature data. Some pure compounds and extracts have been evaluated for their antioxidant activities through different methods: DPPH and ABTS assays as well as CUPRAC assay. Genotoxic and antigenotoxic activities of pure compounds were also evaluated in-vitro on Escherichia coli PQ37 cells by the SOS Chromotest.


Introduction
The genus Phlomis (Lamiaceae) includes about 100 species, which are widespread in Africa, Asia, and Europe. This genus is divided into two sections Phlomis and Phlomoides. The genus Phlomis is widely used in traditional medicine in many areas. In Algeria this genus is traditionally used to treat inflammation and rheumatism (1). In Turkey, most species in this genus are used as a tonic or stimulant (2). In China, 43 other species are the most popular herbs in China due to their aromatic and medicinal properties (3).
The biological investigation and the chemical studies of extracts of the genus Phlomis have shown that they possess numerous biological activities. For example, aqueous extract of aerial parts of Phlomis crinita and Phlomis grandiflora are reported for treating gastric ulcers (4,5).
Phlomis bovei De Noé subsp bovei known as Kayat El Adjarah or Tarseouan is one rare and endemic of the four species that are encountered in Algeria. This plant is used as a glue, and as a healing to treat burns lesions and skin infections and allergies (7). The main components of Phlomis bovei, previously reported were flavones and sterol (8). In this paper we described the isolation and identification of five more flavonoids of Phlomis bovei. Their structures were elucidated on the basis of nuclear magnetic resonance (NMR) analyses, including onedimensional (1D) and two-dimensional (2D) NMR experiments, mass spectrometry and by comparison with literature data.
Some pure compounds and extracts have been evaluated for their antioxidant activities through different methods: DPPH and ABTS assays as well as CUPRAC assay. Genotoxic and antigenotoxic activities of pure compounds were also evaluated in-vitro on Escherichia coli PQ37 cells by the SOS Chromotest.

Experimental
General experimental procedures NMR spectra were recorded on a Brucker DRX 500 Spectrometer (500 MHz for 1 H and 125 MHz for 13

Genotoxicity assay
The SOS Chromotest employs the errorprone DNA repair pathway of Escherichia coli PQ37, also known as the SOS response, a complex regulatory network that is induced by DNA-damaging substances (9). The test involves incubation of the bacteria with the sample under investigation and subsequent determination of b-galactosidase activity. The test was performed as recommended by Quillardet and Hofnung (10) by dividing the reaction mixtures into two series: one for β-galactosidase (β-gal) activity measurement (inducible) and the other for alkaline phosphatase (AP) (constitutive) to control the protein synthesis. The enzymatic activities were measured at 420 nm using a blank without bacteria. Positive control consisted of nitrofurantoin (NF). The induction factor (IF) was calculated as the ratio of Rc/R 0 , where Rc is equal to (β-gal activity/AP activity) determined for the test compound at concentration c and R 0 is equal to (β-gal activity/AP activity) in the absence of test compound. The β-galactosidase and alkaline phosphatase activities were calculated according to the method recommended by Quillardet and Hofnung (11). The compounds are classified as non-genotoxic if the IF (Induction Factor) remains <1.5, as marginally genotoxic if the IF ranges between 1.5 and 2 and as genotoxic if the IF exceeds 2 (12). The data were analyzed for statistical significance using the Duncan test.
In a series of experiments preceding the SOS Chromotest assay, it was ascertained, by using the method of disc, that the different amounts of extracts and molecules added to the indicator bacteria does not influence their viability, and does not provoke a significant decrease of alkaline phosphatase activity, which is an indicator of the normal protein synthesis in Escherichia coli PQ37.

Antigenotoxicity assay
The antigenotoxicity of extracts and compounds against nitroxazide (10 mg/assay) damage was studied. The compounds were dissolved in dimethylsulfoxide (DMSO), three concentrations of each compound (2, 10 and 50 mg/assay) and of each extract (10, 50, and 250 mg/assay) were prepared and tested in triplicate. Percentages of antigenotoxicity (%AG) were determined according to the Equation Where IF 1 is the IF in the presence of the test compound and the genotoxin, IF 2 is the IF in the absence of the test compound and in the presence of the genotoxin and IF 0 is the IF of the untreated cells. The data were collected with a mean ± standard deviation of three independent experiments, and analyzed for statistical significance using the Dunett test.

DPPH free radical-scavenging activity
Free radical scavenging capacity of the purified compounds was determined with the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay (13). The molecule DPPH is characterized as stable-free radical by virtue of the delocalization of the spare electron over the molecule; this delocalization gives rise to a deep violet color, characterized by an absorption band in methanol solution centered at as stable-free radical by virtue of the delocalization of the spare the molecule; this delocalization gives rise to a deep violet color, The EC 50 value (mol/L antiox)/(mol/L DPPH), defined as the effective concentration of antioxidant necessary to decrease the initial DPPH concentration by 50% (14), was calculated from the results by linear regression analysis. The antiradical power (ARP) was calculated as 1/EC 50 : the highest ARP is associated with the greatest DPPH scavenging effect. Evaluation of free radical-scavenging activity was performed with Trolox equivalent antioxidant capacity (TEAC). TEAC value is based on the ability of the antioxidant to scavenge the radical DPPH and is defined as

Measurement of the ABTS-scavenging activity
For the ABTS assay, the procedure followed the method of Arts et al. (15,16) with some modifications. This test was carried out on 96 wells microplates and compounds were dissolved in MeOH. The absorbance was measured at characterized as stable-free radical by virtue of the delocalization of the spare electron over the molecule; this delocalization gives rise to a deep violet color, characterized by an absorption band in methanol solution centered at  515 nm with a spectrophotometer. This assay was conducted according to the method ABTS .+ % = ((DO control -DO sample )/DO control ) × 100 The evaluation of the radical-scavenging activity in this method is identical to DPPH method (EC 50 , TEAC, ARP).

Antioxidant capacity by CUPRAC
The test CUPRAC (Cupric ion reducing Antioxidant Capacity) was first described by Apak et al., (17). It is based on the capacity to use the copper (II)-neocuproine reagent as the chromogenic oxidizing agent. This test was carried out on 96 wells microplates. The antioxidant capacity of the compounds and extracts were evaluated as Trolox equivalents (TEAC values). If the results are exposed as DO = f (concentration of compound in g/L), TEAC could be calculated as E‰ (compound) /E‰ (Trolox) where E‰ represents the slope for each curve obtained.

Results and Discussion
The methanolic extract of the aerial parts of Phlomis bovei was fractionated and purified by combination of chromatographic methods to obtain five known flavones glucosides, and two cinnamic acid derivatives. Chrysoériol  The different extracts from P. bovei were tested for the ability to scavenge DPPH and ABTS + free radicals and also for the capacity to reduce the cupric ion. The results are presented in Table 1. The methanolic and hydromethanolic extracts showed the most significant antiradical activities towards the 1,1-diphenyl 2-picrylhydrazyl (DPPH) whereas the methanolic extract had a good antioxidant activity measured with the CUPRAC test with a TEAC = 0.23.
The other extracts exhibited a low antiradical activity since TEACs are less than 0.2 with DPPH, ABTS, or CUPRAC.
The activities of the phenolic compounds 1-5 isolated from the MeOH extract were measured via the DPPH, ABTS, and CUPRAC tests at different concentrations taking trolox as the positive drug ( Table 2).
The five compounds isolated showed no measurable radical scavenging activity toward DPPH.
The comparison between the antioxidant activity of compounds 3 and 5 shows that the TEAC measured with the CUPRAC test reveals large disparities. Compound 3 is almost 4 times more active than trolox (TEAC CUPRAC = 3.68 vs. TEAC CUPRAC = 1.00 for Trolox), while compound 5 has an insignificant activity (TEAC = 0.04). These results are consistent in a sense with those described by Apak et al. (17 2004), which attribute a strong effect to the presence of a strong conjugated structure as in the cinnamic acid derivatives (Ar-CH = CH-COO), which cannot then be attacked by the cupric ion. However, our results show that this can be nuanced depending on the position of the coumaryl group on sugar. The presence of Z/E isomers is favorable to reduce the antioxidant capacity measured with CUPRAC as shown with TEAC values of compound 1 or 2 (TEAC = 0.14 and TEAC = 0.03 respectively). It is the same for the substitution by a methoxy group in meta position of the para-coumaryl nucleus (compound 4).
The TEAC value of compounds 1 (TEAC = 0.13) and 4 (TEAC = 0.19) were more active than the reference (rutin) (TEAC = 0.11) concerning radical scavenging properties toward ABTS + .      Concerning the genotoxicity studies, compound 3 was evaluated as non-genotoxic at all tested concentrations (Table 3). Whereas compounds 1 (at 10 µg/assay), and 4 (at 50 µg/ assay) are shown to be marginally genotoxic at the indicated concentrations. Therefore, DNA is not considered as a target for these compounds.
On the other hand, we studied the protective effect of flavones 1, 3, and 4 on NF induced damage. Dose of 10 mg/assay of NF was chosen for the antigenotoxicity studies, since this dose was not toxic and induced a significant SOS response. It is the dose that gives the maximum of genotoxicity for NF. As shown in Table 4, compounds 1 and 3 reduce the genotoxicity induced by NF moderately by 86.6% and 64.6%, respectively, at the highest dose of 50 μg/assay. Lastly, compound 4 was the one showing the strongest activity, since it remains close to 90% of genotoxicity inhibition at low dose (2 μg/assay).
Flavonoids 3 and 4 are shown to possess a considerable antimutagenic potency in our experiments. This result can be explained by the presence of a g pyrone group (nucleus C), two hydroxyl groups on C-4/C-5 in the flavonoid structure, as reported previously by Krizkova et al. (25) and Edenharder et al. (26). On the contrary, compound 1 showed the lowest diminution of antimutagenic effect compared to compounds 3 and 4, this effect could probably be ascribed to the methylation of the 3'-hydroxyl function as hypothesized by Edenharder et al. (26).

Conclusion
Five known flavonoids and two cinnamic acid derivatives, were isolated from the aerial parts of Phlomis bovei de Noé used for its medicinal properties. Compound 4 has been described for the first time inthe genus Phlomis and in the Lamiaceae family.
The antiradical activity of the polar extracts depends on the type of radical to be trapped. But these extracts have a chelating effect, hence an antioxidant activity.
On the other hand, non polar extracts have no antioxidant effect (antiradical/chelation of metals).
For compounds isolated from Phlomis bovei, it has been noted that most flavonoid compounds do not exhibit significant antioxidant activity except compound 3 which showed a high activity concerning radical scavenging properties toward ABTS+ compared to trolox. As a correlation between antigenotoxic and antiradical activities has been established by Park et al. (27), this led us to test the isolated products. The results obtained show the interest of compound 3 to inhibit the genotoxicity of nitrofurantoin but the compound 4 exhibits antigenotoxicity at different concentrations.