Les infections bactériennes constituent un problème de santé publique. La virulence et la résistance aux antibiotiques notamment de Pseudomonas aeruginosa demeure une menace pour la santé humaine. Compte tenu du rôle central du Quorum Sensing dans la production des facteurs de virulence et la formation du biofilm, l’inhibition de ce mécanisme de communication bactérienne constitue une opportunité pour atténuer la pathogénicité des bactéries résistantes aux antibiotiques. Notre étude visait à évaluer l’activité anti-Quorum Sensing de Terminalia avicennioides, utilisé en médecine traditionnelle au Burkina Faso dans le traitement des brûlures infectées. Les investigations ont porté sur la capacité de l’extrait méthanolique de l’écorce de tronc à interférer avec les mécanismes de Quorum Sensing des souches Chromobacterium violaceum 12472 et Pseudomonas aeruginosa PAO1. À la concentration non bactéricide (100 μg/mL) l’extrait a impacté négativement le mécanisme de Quorum Sensing de C. violaceum et de P. aeruginosa en réprimant l’expression des gènes des systèmes las et rhl ce qui a entrainé une réduction de la production de la pyocyanine, des rhamnolipides et la formation du biofilm. Les activités antivirulence, antibiofilm et anti-Quorum Sensing de l’écorce de tronc de T. avicennioides pourraient justifier son utilisation traditionnelle dans le traitement des brûlures infectées. ENGLISH ABSTRACT Bacterial infections are a significant public health problem. The virulence and resistance to antibiotic of Pseudomonas aeruginosa in particular remain a threat to human health. Due to the pivotal role of Quorum Sensing in the production of virulence factors and biofilm formation, inhibiting this bacterial communication mechanism could reduce the pathogenicity of antibiotic-resistant bacteria. The aim of our investigation was to evaluate the anti-Quorum Sensing activity of Terminalia avicennioides, used in traditional medicine in Burkina Faso for the management of infected wounds. The investigations focused on the ability of the methanolic extract of the stem bark to interfere with the Quorum Sensing mechanisms of Chromobacterium violaceum 12472 and Pseudomonas aeruginosa PAO1. At a non-bactericidal concentration (100 μg/mL), the methanolic extract of T. avicennioides negatively impacted the Quorum Sensing mechanism of C. violaceum and P. aeruginosa by repressing the expression of the las and rhl system genes, which resulted in a reduction in the production of pyocyanin, rhamnolipids and biofilm formation. The anti-quorum sensing activity, resulting in antivirulence and antibiofilm activities, of T. avicennioides stem bark could justify its traditional use in the treatment of infected wounds. Keywords: Pseudomonas aeruginosa, biofilm, Chromobacterium violaceum, Terminalia avicennioides

Bacterial resistance to antibiotics is a global health challenge, partly due to biofilm formation, which protects bacteria against drugs and the immune system. This study investigated the potential of essential oils from Lippia multiflora flowers to inhibit bacterial biofilms, offering a natural alternative to address bacterial resistance. Antibacterial activity against Staphylococcus aureus and Streptococcus mutans was assessed using the agar diffusion method on Luria Bertani agar. The minimal inhibitory concentration (MIC) was determined using the serial liquid dilution process and the minimal bactericidal concentration (MBC) by the bacterial growth assay on Luria Bertani agar. Biofilm inhibition was tested spectrophotometically at 590 nm using the crystal violet assay, antioxidant activity was performed using the DPPH method, and phytochemical composition was determined by gaz chromatography-mass spectrometry (GC-MS) analysis. The essential oils produced larger inhibition zones against S. aureus (28.38 ± 0.23 mm) and S. mutans (24.5 ± 0.25 mm) compared with standard antibiotics (gentamicin disc, 13.5 ± 0.07 mm for S. aureus; oleandomycin disc, 16.5 ± 0.05 mm for S. mutans). MIC was ranged from 0.10 ± 0.00% for both S. aureus and S. mutans, and MBC was not achieved within the tested range (≤ 0.10%). The essential oils inhibited biofilm formation more effectively than salicylic acid (p < 0.001), with inhibition rates of 59.97 ± 0.68% for S. aureus and 71.63 ± 0.15% for S. mutans. Essential oils showed stronger antioxidant activity (DPPH IC50 value of 0.23 ± 0.02 µg/µL) compared with the ascorbic acid (DPPH IC50 value of 0.33 ± 0.01 µg/µL). GC-MS analysis identified 22 terpenes, including major components β-caryophyllene (43.55%), germacrene D (16.44%), elemol (10.33%) and eucalyptol (6.41%). These results demonstrated that the essential oils of L. multiflora flowers are a potent source of antibacterial compounds.

Background: Infectious diseases are one of the leading causes of death worldwide because of antibiotic resistance. Ageratum conyzoides is one of the antimicrobial medicinal plants that is being used to fight various multi-resistant pathogenic bacteria in Burkina Faso. Aim: The aim was to promote safe medicinal use of A. conyzoides by highlighting the anti-biofilm and anti-motility effects of its methanol extract. Setting: The study was conducted at the Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso. Methods: The antibacterial activities of methanol extract were evaluated by evaluating swimming, swarming and twitching motilities performed in an agar medium. The anti-biofilm effect was conducted in microtiter plates using the crystal violet method. The antioxidant and enzyme inhibition activities were evaluated using 2,2-diphényl-1-picrylhydrazyl; 2,2’-azino-bis (3-éthylbenzothiazoline-6-sulfonic acid), Ferric Reducing Antioxidant Power and conducting lipoxygenase test. Results: From the study, 100 µg/mL and 200 µg/mL of extract presented significant inhibition of P. aeruginosa and E. coli swarming motility but did not exhibit a significant effect on P. aeruginosa swimming and E. coli twitching motilities. The extract was effective in reducing biofilm formation in a concentration-dependent manner without affecting bacterial growth. In addition, the extract showed some capabilities to inhibit lipoxygenase activity and exhibit antioxidant potential, which could contribute to the control of oxidative stress-related diseases. Conclusion: From this study the anti-biofilm and anti-motility potential of the A. conyzoides extract provided the experimental background for the further development of antibacterial drugs. Contribution: This study provided additional scientific evidence to support the use of A. conyzoides in traditional medicine against bacterial infections.

Objective:The integrity of the DNA is continously menaced by the harmful genotoxic compounds. The endogenous system responsible for preserving the DNA integrity, often fails following a massive influx of these genotoxic compounds. Reseaches on exogenous bioactive compounds from fruits and vegetables are necessary. This study was designed to evaluate the free radical scavenging activity and the DNA protection/repair potentiality of the extracts of Detarium microcarpum fruit pulp to protect against the arsenic trioxide-induced DNA oxidative degradation. Materials and Methods:The ability of extracts to trap free radicals was assessed by using the 2,2-diphenyl-1-picrylhydrazyl (DPPH), nitric oxide and hydroxyle radicals quenching assay. The comet assay was performed for evaluating the DNA protection/repair property of extracts to inhibit the DNA oxidative damage induced by arsenic trioxide. Results:All extracts at a final concentration of 50 µg/mL have quenched more than 50% of DPPH, nitric oxide and hydroxyle radicals. Moreover, all extracts have showed good DNA protection/repair activity against the arsenic trioxide-induced DNA oxidative damage compared to arsenic treatment alone (p<0.001). However, methanol fractions have exhibited the best DNA protection/repair activities by reducing considerably DNA fragmentations compared to arsenic treatment (p<0.001). The genoprotective activity of the extracts was positively correlated with their free radical scavenging abilities. Conclusion:The methanol fraction of D. microcarpum fruits have exhibited interesting DNA protection /repair properties probably due to its free radicals quenching ability. Further investigations are necessary to identify the phytomolecules responsible for these biological activities.

Prosopis africana is traditionally used in folk medicine in Burkina Faso for oral diseases. Leaves and stems are used in rural areas to treat dental caries, and the bark is used to treat green diarrhea in infants. In the context of a better understanding of Prosopis africana’s bioactivity and toxicity, the present study deals with the chemical profiling of the different botanical parts of P. Africana used in phytomedicine. The impact of herbal medicine on various factors contributing to oral infections and caries, specifically with its anti-biofilm and anti-quorum sensing properties have been little investigated. The anti-biofilm effect of methanolic extracts of leaves and stems of P. africana was evaluated on Streptococcus mutans, Staphylococcus aureus, and Pseudomonas aeruginosa by using the crystal violet assay. The anti-quorum sensing effect on Chromobacterium CV026 and Pseudomonas aeruginosa was assessed spectrophotometrically by using the violacein, rhamnolipids and pyocyanin quantification assay. The cytotoxicity of the leaves and stems extracts was also evaluated by using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide method. The chemical composition of the extracts was characterized by UPLC-UV/DAD-MS2/ESI-QTOF analysis. The extracts (100 µg/ml), without affecting cells viability, significantly reduced the biofilm formation of S. mutans with the best inhibition rates of 56.7

The integrity of the DNA is continously menaced by the harmful genotoxic compounds. The endogenous system responsible for preserving the DNA integrity, often fails following a massive influx of these genotoxic compounds. Reseaches on exogenous bioactive compounds from fruits and vegetables are necessary. This study was designed to evaluate the free radical scavenging activity and the DNA protection/repair potentiality of the extracts of Detarium microcarpum fruit pulp to protect against the arsenic trioxide-induced DNA oxidative degradation. The ability of extracts to trap free radicals was assessed by using the 2,2-diphenyl-1-picrylhydrazyl (DPPH), nitric oxide and hydroxyle radicals quenching assay. The comet assay was performed for evaluating the DNA protection/repair property of extracts to inhibit the DNA oxidative damage induced by arsenic trioxide. All extracts at a final concentration of 50 µg/mL have quenched more than 50% of DPPH, nitric oxide and hydroxyle radicals. Moreover, all extracts have showed good DNA protection/repair activity against the arsenic trioxide-induced DNA oxidative damage compared to arsenic treatment alone (p<0.001). However, methanol fractions have exhibited the best DNA protection/repair activities by reducing considerably DNA fragmentations compared to arsenic treatment (p<0.001). The genoprotective activity of the extracts was positively correlated with their free radical scavenging abilities. The methanol fraction of D. microcarpum fruits have exhibited interesting DNA protection /repair properties probably due to its free radicals quenching ability. Further investigations are necessary to identify the phytomolecules responsible for these biological activities.

Background: Bacterial resistance to conventional antibiotic therapy has become a global health crisis. Bacterial biofilm formation allows bacteria to develop resistance to antibiotics and the host immune system. This study aims to contribute for fighting against bacterial resistance through the inhibition of bacterial biofilm formation by Lippia multiflora flowers essential oils. Methodology: The sensitivity of Staphylococcus aureus and Streptococcus mutans to the essential oils was measured on the Luria Bertani-Agar mediumby using the antibiotic susceptibility test. The anti-biofilm potential of the essential oil was evaluated by t he crystal violet method. The antioxidant potential of the essential oils was assessed by the DPPH method. The phytochemical profile was determined by gas chromatography-mass spectrometry (GC/MS) analysis. Results: The essential oils showed higher growth inhibition diameters of S. aureus (28.38±0.23 mm) and S. mutans (24.5±0.25 mm) than reference antibiotics such as gentamicin 30 mg (13.5 ± 0.07 mm on S. aureus ) and Oleandomycin 10μg (16.5 ± 0.05 mm on S. mutans ).The essential oil was also more active in inhibiting biofilm formation than salicylic acid with inhibition percentages ranged from 60 ± 0.00% on S. aureus and 71.60 ± 0.70% on S. mutans . Moreover, the essential oils exhibited good antioxidant activity with anti-DPPH inhibitory concentration ranged from 0.23 ± 0.02 µg/ùL. GC-MS analysis of the essential oils led to the identification of 22 terpens compounds with 7 major compounds such as β-caryophyllene (43.55%), germacrene D (16.44%), elemol (10.33%), eucalyptol (6.41%), humulene (3.28%), α-phellandrene (2.68%) and β-ocimene (2.62%). Conclusion: These results showed that the essential oils of L. multiflora flowers are a promising candidate in the fight against bacterial resistance.

Oral infections pose a significant global health issue. This study assessed the antibacterial properties of methanol and dichloromethane extracts from Lippia multiflora flowers against Staphylococcus aureus ATCC 43300 and Streptococcus mutans ATCC 2517, two bacteria known to cause oral infections. The study measured the ability of these flower extracts to inhibit the growth and biofilm formation of S. aureus and S. mutans using micro-dilution and crystal violet methods, respectively. Additionally, we analyzed the presence of secondary metabolites in the extracts both qualitatively and quantitatively. The antioxidant properties of the extracts were evaluated using DPPH, ABTS, and FRAP methods. The results indicated that the dichloromethane extract demonstrated a more substantial bactericidal effect than the methanolic extract against S. mutans and S. aureus, with minimal bactericidal concentrations of 0.25 ± 0.02 mg/mL and 3.13 ± 0.30 mg/mL, respectively. Furthermore, the dichloromethane extract at a 100 µg/mL concentration exhibited the highest anti-biofilm activity against both S. aureus and S. mutans. Phytochemical screening revealed the presence of alkaloids, flavonoids, quinones, and tannins in both extracts. The total phenolic content was higher in the methanolic extract (49.57 ± 2.74 mg EAG/100 mg) compared to the dichloromethane extract (25.71 ± 0.39 mg EAG/100 mg). Similarly, the total flavonoid content was more significant in the methanolic extract (2.87 ± 0.049 mg EQ/100 mg) than in the dichloromethane extract (2.24 ± 0.02 mg EQ/100 mg). The methanolic extract also exhibited superior anti-DPPH and anti-ABTS activities, as well as a higher Fe (III) reduction potential than the dichloromethane extract (P < 0.05). These findings suggest that L. multiflora flowers could serve as a potential source of antimicrobial agents for combating oral infections.

Background: The emergence of the multidrug-resistant bacteria strain has become a global world crisis. This study was designed to evaluate the antibiofilm and synergistic effects of Lippia multiflora leaf extracts on the activity of cefotaxime against the methicillin-resistant Staphylococcus aureus (S. aureus). Methods: The synergistic effect of methanol and dichloromethane extracts on the bactericidal activity of cefotaxime was determined by using the antibiotic susceptibility test on agar medium. The antibiofilm activity of the extracts was measured by using the crystal violet method. The antioxidant potential of the extracts was assessed by using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and Ferric Reduction Activity Potential (FRAP) methods. The main secondary metabolites groups were analyzed by using different standard analytical tests. The total phenolics and total flavonoids were quantified spectrophotometrically. Results: The methanol extract (final concentration of 100 µg/ml) inhibited the formation of bacterial biofilm more than salicylic acid (p<0.05). All extracts combined with cefotaxime (20 µg and 200 µg) showed good synergistic bactericidal effect on S. aureus with inhibitory diameters of up to 40 mm. The methanol extract showed higher total phenolics (462.20±10.90 mg EAG/g) and total flavonoids (26.20±0.20 mg EQ/g) contents than the dichloromethane extract (96.70±1.70 mg EAG/g and 8.00±1.20 mg EQ/g). Moreover, the methanol extract showed a higher FRAP reducing power (353.6± 4.17 mmol EQ/g) than the dichloromethane extract (385.3±7.01 mmol EQ/g). Qualitative phytochemical analysis showed the presence of tannins, flavonoids, terpenes and sterols in both extracts. Conclusion: These data showed that L. multiflora leaves contain effective antibacterial phytomolecules for combating bacterial resistance.

Loranthaceae are parasitic plants used in traditional medicine. Their use generally depends on the host plant. This shows that the biological properties of these species depend on their host. As phytochemistry is responsible for biological properties, it depends on the parasite's host. The aim of this study was to evaluate the variation in phytochemistry and antioxidant activity of Tapinanthus dodoneifolius leaves and bark harvested from different hosts using IR, UV and TLC methods. The results showed that the total polyphenol content of T. dodoneifolius twig bark harvested from Acacia seyal, Albizia lebbeck and Piliostigma reticulatum was identical. The same observation is made with the leaves, the content of which remains lower than that twigs barks. Leaves contain more total flavonoids than twig bark. Infrared, UV and TLC analyzes showed the presence of sesquiterpene lactones in leaves extracts of T. dodoneifolius harvested from A. lebbeck and P. reticulatum. The best antioxidant activity was obtained with the bark of T. dodoneifolius harvested from A. lebbeck and P. reticulatum.

Bacteria use different types of motilities in order to colonize and adapt to new environments. These motilities also play an important role in the formation of biofilm, allowing bacteria to develop resistance to antibiotics and host’s immune systems. The objective of this study was to evaluate the ability of essential oils of Lippia multiflora flowers to inhibit biofilm formation and motility in Pseudomonas aeruginosa PAO1. The capacity of essential oil of Lippia multiflora flowers to inhibit biofilm formation in Pseudomonas aeruginosa was evaluated spectrophotometrically by using the crystal violet method. The property of the essential oil to inhibit different types of motilities such as swimming, swarming and twitching was further evaluated by measuring the diameters of bacterial migration on liquid or semi-liquid Luria Bertani agar medium. The essential oil exhibited good anti-biofilm activity in Pseudomonas aeruginosa. At a concentration of 1%, essential oil presented a degree of biofilm inhibition similar to that of salicylic acid used as a reference (P > 0.05). In addition, the essential oil significantly inhibited swarming, twitching and swimming in Pseudomonas aeruginosa compared to the control (P < 0.001). The inhibition of biofilm formation as well as that of bacterial motility increases with the concentration of the essential oil. The essential oil of Lippia multiflora flowers possesses an anti-bacterial potential to fight against multi-resistant bacteria.

Background: Pseudomonas aeruginosa causes infections in human particularly immunocompromised patients with cystic fibrosis, severe burns and HIV, resulting in high morbidity and mortality. The pathogenic bacteria P aeruginosa produces virulence factors regulated by the mechanism called quorum sensing system. Objective: The aim of this study was to assess the anti-quorum sensing activity of Ageratum conyzoides extracts Method: Chromobacterium violaceum reporter strain CV026 was used to highlight any interference with bacterium QS and strains derived from P. aeruginosa PAO1 were used to reveal any interference with the expression of quorum sensing genes, and to assess any impact of extract on the kinetics of the production of pyocyanin, elastases and biofilm formation. Results: Hydro-methanolic extract at the sub-inhibitory concentration of 100 μg/mL reduced quorum sensing virulence factors production such as, pyocyanin, elastases, rhamnolipids and biofilm formation in P. aeruginosa PAO1 after 18 hours monitoring. Extract showed significant inhibition in HSL-mediated violacein production on C. violaceum CV026 after 48 hours monitoring. Biofilm formation was inhibited up to 32%. It affected QS gene expression in PAO1. The regulatory genes lasR / rhlR and the lasI synthases were most affected. At 8hours, hydro-methanolic extract reduced both QS gene to more than 30% (lasI/lasR and rhlI/R respectively 33.8% /30.2% and 36% /33.2%). RhlA and lasB genes have been relatively affected (13.4% and 28.9%). After 18 h, this extract reduced significantly the expression of regulatory 30 genes lasR (31%) and rhlR (39.6%) although synthases genes seemed to be less affected (lasI/21.2% and rhlI/11.6%). A limited impact was observed on the downstream genes (lasB /20.0% and rhlA /15.3%). No negative impact was observed on CV026 and PAO1 growth and cell viability. Our study also showed that A. conyzoides having ample amount of phenolics, flavonoids and triterpenoids. This phytochemical content could be one of the factors for showing anti quorum potential. Conclusion: Results indicate that hydro methanol 80 % extract from A. conyzoides could be a source of potential QS inhibition compounds.

Context: Maize silk (Zea mays) is used in traditional medicine to treat high blood pressure, diabetes and obesity. It is also used as an immunostimulant but few scientific studies are available to validate these properties. Aims: The aim of this study was to scientifically validate the traditional use of maize silk in the regularization of lipid profile and blood glucose level. Material and Methods: Hydroalcoholic extract of maize silk (HAEMS) was prepared by decoction (30:70 Water-Ethanol) from the dry powder of corn silk (250 g/L). Hyperglycemia was induced by repeated single daily subcutaneous injection (s.c) of dexamethasone (5 mg/kg); dexamethasone negative control group (DNC) received dexamethasone exclusively throughout 14 days while negative normal control group (NNC) received only vehicle during the same period. Positive control group (glibenclamide) and plant extract groups (50 and 100 mg/kg) received dexamethasone from the eighth day and each group consisted of six animals. All the parameters (fasting blood glucose level, TC, HDL, LDL, VLDL, atherogenic index (AI) and TG) were measured on the first, seventh and fourteenth day of the experiment. Lipid profile was performed using a BIOLABO® Kit and fasting blood glucose level was measured using a glucometer VivaCheck™ Ino. Results: Compared to the DNC group, HAEMS significantly reduced (P<0.001) on days seven and fourteen, fasting blood glucose level, TC, LDL, VLDL, artherogenic AI and TG (on day seven). In addition, only the dose of 50 mg/kg significantly increased serum HDL on the seventh (P<0.01) and fourteenth day (P<0.001). Conclusion: The results obtained in this study suggest that HAEMS have hypoglycemic and antihyperlipidemic properties.

Introduction the leaves of Vernonia amygdalina (V. amygdalina) are consumed as food in sub-Saharan Africa (SSA). In traditional medicine, this plant is widely used in the treatment of cancer and diabetes mellitus. In the present study, we evaluated the antihyperglycemic and the antiproliferative activities of the hydroalcoholic extract of V. amygdalina leaves (HAEVa). Methods we conducted an experimental descriptive and analytical study with a prospective data collection from May 2019 to July 2020. For the in vivo study, the experiments were carried out on albino male rats of Wistar strain (Rattus norvegicus). Antihyperglycemic activity was performed in vivo in dexamethasone-induced insulin-resistant rats using the oral glucose tolerance test (OGTT). The biocompatibility and the antiproliferative activity of extract were performed in vitro respectively on rabbit primary dermal fibroblasts (RPDF) and human osteosarcoma MG-63 cells using the 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The data were analyzed with the GraphPad Prism software version 5.0.3. The statistical analyses were obtained by the analysis of variance (ANOVA), followed by Bonferroni´s post-test. P<0.05 was considered as the minimal level of statistical significance. Results regarding to the antiproliferative investigation, extract at 125, 250 μg/mL exhibited a significant cytotoxic effect on human osteosarcoma MG-63 compared to the vehicle (p<0.001) in a dose-response manner after 24h, 48h of exposure to HAEVa. Interestingly, HAEVa in concentrations of 125 and 250μg/ml showed no cytotoxicity (p>0.05) on RPDF after the different times of exposure. However, HAEVa in a high concentration of 500 μg/mL wasn´t biocompatible with RPDF. HAEVa also prevented postprandial blood glucose level in dexamethasone-induced insulin-resistant rats at both doses tested (p>0.05 and p<0.01 at doses of 50 and 100 mg/kg respectively). Conclusion the results of this study suggest that HAEVa has antiproliferative properties on MG-63 osteosarcoma in vitro and also inhibits in vivo the postprandial blood glucose level in dexamethasone-induced insulin-resistant rats.

Background In traditional medicine, the maceration of seeds of Garcinia kola (GK) is used to treat various diseases including diabetes. In traditional pharmacopoeia, GK seeds are used to strengthen the immune system and as a stimulant and aphrodisiac. Aims This study aimed to evaluate the antidiabetic free radical scavenging effects of the hydroalcoholic extract of GK seeds (HAEGS) in a dexamethasone-induced hyperglycemic (DexIH) rat model. Settings and Design This study was an interventional study. Subjects and Methods Here using in vivo model, we assessed some pharmacological properties of HAEGS in DexIH rat. Hypoglycemia, antihyperglycemia, spasmolytic and laxative activities were also evaluated in DexIH. In vitro study assessed antiradical activity. The HAEGS was obtained by decoction introducing 250 g with water–ethanol mixture (30:70). The plant extract was administered to the animals at doses of 50 (GK50) and 100 (GK100) mg/kg body weight. All animal experiments were in accordance with ARRIVE guidelines and were performed in accordance with the scientific procedures of UK Animals. Antiradical activity of GK was assessed in vitro by inhibition of the activity of 2,2-diphenyl-1-picrylhydrazyl. Statistical Analysis Used Statistical analysis was performed using GraphPad Prism 5.03 software, and P values less than 0.05 were considered statistically significant. Results At doses 50 and 100 mg/kg, GK significantly (P < 0.001) regulated DexIH after two weeks of treatment compared to the normoglycemic control and hyperglycemic rats. The extract at both doses significantly (P < 0.001) inhibited the spasmolytic activity in both normoglycemic and hyperglycemic rats compared to Imodium®. In rats DexIH rats, only dose 100 mg/kg significantly (P < 0.05) increased laxative effects when compared to the negative control. In vitro antiradical activity of GK revealed vitamin C-like antiradical activity. Conclusions This study justifies the traditional use of GK seeds as an antidiabetic.

Plants are widely used in developing countries for traditional medicine. Knowledge of biological activities and phytochemistry is necessary for the safe use of these plants in traditional medicine. Securidaca longepedunculata is a medicinal plant whose roots are widely used in the treatment of several diseases. In this study the content of total triterpenes in leaf and root bark was assessed. The antioxidant activity by the ABTS method was evaluated as well as the effect of the extracts on lipid peroxidation of mice liver cell membranes. Acute toxicity was evaluated at the dose of 2000 mg / mL administered to the mouse. The results showed that the maximum values of the triterpenes contents of the leaves and of the root bark are 58 and 21 mg UAE / 100 mg respectively. Methanolic and chloroform extracts from leaves and root bark inhibited more than 50% of lipid peroxidation. The same extracts showed strong ABTS cation reduction activity. The leaf extract did not induce signs of acute toxicity in mice at a dose of 2000 mg / mL. The leaves of S. longepedunculata could be used in the management of pathologies associated with oxidative stress or which require biological properties relating to triterpene compounds. Keywords: Securidaca longepedunculata, triterpenes, peroxidation, toxicity

The consumption of tropical fruits rich in chemopreventive compounds are required to prevent cells carcinogenesis and proliferation. This study was designed to assess de biocompatibility of Detarium microcarpum fruit extract on normal fibroblasts and its antiproliferative potentiality on human osteosarcoma MG-63 cells. Primary dermal fibroblasts and human osteosarcoma MG-63 cells were treated with different concentrations of hexane, chloroform, ethyl acetate and methanol extracts of D. microcarpum fruit pulp for 24h, 48h and 72h. The biocompatibility property of extracts on the normal fibroblasts and its antiproliferative activity on the human osteosarcoma cells were evaluated by using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenytetrazolium bromide (MTT) assay. The biocompatibility study of D. microcarpum fruit pulp showed that the chloroform extract has exhibited the highest cytotoxic effect on normal fibroblasts followed by the ethyl acetate extract. Hexane extract wasn’t cytotoxic at concentrations of 125 and 250 µg/mL but caused more than 80 % of cell death at a concentration of 500 µg/mL. Methanol extract didn’t show a significant cytotoxic effect. Furthermore, chloroform and ethyl acetate extracts showed the best antiproliferative activity on osteosarcoma cells. A complete cell death was observed when osteosarcoma cells were treated with ethyl acetate extract at all concentrations while chloroform extract at concentrations of 250 and 500 µg/mL caused a complete cells death. Methanol extract exhibited any antiprolifarative activity. Chloroform and ethyl acetate extract of fruits pulp of D. microcapum are potent source of anticancer phytomolecules and have potential to be a promising anti-osteosarcoma extract.

The emergence of bacterial resistance to antibiotics is a serious challenge to the global health system. The QS inhibition is one of the approaches to fight against antibiotic resistance in bacteria. Securidaca longepedunculata is a medicinal plant that roots are the only organ used against microbial diseases. This species is threatened with extinction due to the massive use of its roots in phytotherapy. In this study, the anti-QS and anti-biofilm activities of S. longepedunculata leaves methanolic extract at 100 to 400 µg/mL was assessed against the bacterial strains Chromobacterium violaceum CV026 and Pseudomonas aeruginosa PAO1. The results showed anti-QS and anti-biofilm activity of S. longepedunculata leaves which reduced violacein production in C. violaceum CV026 by 12 to 59%. The virulence factor pyocyanin in P. aeruginosa PAO1 was inhibited from 13 to 46%. Biofilm formation was significantly inhibited (41%) at 400 µg/mL. Key words: Securidaca longepedunculata, anti-quorum, anti-biofilm.

Objective: Chrysin and rutin are two dietary flavonoids lying in fruits or honey bee’s products. Their pharmacological properties include antioxidant, anti-inflammatory, anticancer, neuroprotection and immunomodulatory. In the current study, the potentiality of chrysin and rutin to protect human gingival fibroblasts against oxidative cell damage has been investigated in vitro. Method: Human gingival fibroblasts, passage 3, were concomitantly put in contact with the cytotoxic compounds and chrysin or rutin for 24 h at 37 °C, 5% CO2 atmosphere, and 96% humidity. The amount of viable cell after the incubated time was recorded by using the thiazolyl blue tetrazolium bromide (MTT) assay. Results: Chrysin in all tested concentration didn’t exhibit any cytoprotective effect against the tert-butyl hydroperoxide-induced oxidative cell damage. Moreover, chrysin in a low concentration (5 and 10 µg/mL) didn’t protect the fibroblasts against oxidative cell damage induced by the hydrogen peroxide. However, chrysin in a concentration of 20 µg/mL showed a significant cytoprotective activity in the hydrogen peroxide-induced cell damage (p < 0.05). Rutin in all tested concentrations protected fibroblasts against hydrogen peroxide and tert-butyl hydroperoxide-induced oxidative cell damage. The cytoprotective effect of rutin didn’t increase with the increase of the concentration when hydrogen peroxide is used to induce oxidative cell damage. However, rutin has protected cells against the tert-butyl hydroperoxide cytotoxicity in a concentration dependent manner. Conclusion: Given to the interesting cytoprotective activities exhibited by chrysin and rutin, further investigations to highlight their cytoprotective involved mechanisms are justified. Keywords: Chrysin, Cytoprotective, Fibroblasts, Rutin.