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  1. Article ; Online: Correction

    Siméon Pierre Chegaing Fodouop / Sedric Donald Tala / Lunga Paul Keilah / Norbert Kodjio / Mefokou Didiane Yemele / Armel Herve Nwabo Kamdje / Bridget Nji-kah / Joseph Tchoumboue / Donatien Gatsing

    BMC Complementary Medicine and Therapies, Vol 23, Iss 1, Pp 1-

    Effects of Vitellaria paradoxa (C.F. Gaertn.) Aqueous leaf extract administration on Salmonella typhimurium-infected rats

    2023  Volume 1

    Keywords Other systems of medicine ; RZ201-999
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Relation between haptoglobin polymorphism and oxidative stress status, lipid profile, and cardiovascular risk in sickle cell anemia patients

    Christian Bernard Kengne Fotsing / Constant Anatole Pieme / Prosper Cabral Biapa Nya / Jean Paul Chedjou / Solange Dabou / Carine Nguemeni / Georges Teto / Wilfred Fon Mbacham / Donatien Gatsing

    Health Science Reports, Vol 5, Iss 1, Pp n/a-n/a (2022)

    2022  

    Abstract: Abstract Objective The haptoglobin (Hp) gene located on chromosome 16q22 exhibits a polymorphism that can impact its capacity to inhibit the deleterious oxidative activity of free hemoglobin. We aimed to determine the influence of Hp polymorphism on ... ...

    Abstract Abstract Objective The haptoglobin (Hp) gene located on chromosome 16q22 exhibits a polymorphism that can impact its capacity to inhibit the deleterious oxidative activity of free hemoglobin. We aimed to determine the influence of Hp polymorphism on oxidative stress, lipid profile, and cardiovascular risk in Cameroonian sickle cell anemia patients (SCA patients). Method The Hp genotypes of 102 SCA patients (SS), 60 healthy individuals (AA), and 55 subjects with sickle cell trait (AS) were determined by allele‐specific PCR, and the blood parameters were assessed using standard methods. Results Hp2‐2 genotype was significantly (P < .05) present in SS (54%) than in AS (42%) and AA (38%). Levels of catalase and cell reactive protein were higher, while levels of total antioxidant capacity, triglycerides, low‐density lipoprotein cholestetol, blood pressure, Framingham score, and body mass index were lower in the SCA patients. These parameters appeared to be unrelated to the haptoglobin genotypes. SCA patients with Hp1‐1 genotype presented a higher oxidative stress index (0.53 ± 0.31) than those with Hp2‐1 (0.33 ± 0.18). Lipid profile and cardiovascular risk were not significantly different between various Hp genotypes in SCA patients. Conclusion Haptoglobin polymorphism did not affect lipid profile, cardiovascular risk, and oxidative stress status of SCA patients. Nevertheless, SCA patients with Hp1‐1 genotype tended to be more prone to oxidative stress than those with Hp2‐1.
    Keywords Cameroon ; haptoglobin ; lipid ; oxidative stress ; polymorphism ; sickle cell anemia ; Medicine ; R
    Subject code 610
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Isolation, characterization and in vitro anti-salmonellal activity of compounds from stem bark extract of Canarium schweinfurthii

    Jean Baptiste SOKOUDJOU / Olubunmi ATOLANI / Guy Sedar Singor NJATENG / Afsar KHAN / Cyrille Ngoufack TAGOUSOP / André Nehemie BITOMBO / Norbert KODJIO / Donatien GATSING

    BMC Complementary Medicine and Therapies, Vol 20, Iss 1, Pp 1-

    2020  Volume 10

    Abstract: Abstract Background Bacteria belonging to the Salmonella genus are major concern for health, as they are widely reported in many cases of food poisoning. The use of antibiotics remains a main stream control strategy for avian salmonellosis as well as ... ...

    Abstract Abstract Background Bacteria belonging to the Salmonella genus are major concern for health, as they are widely reported in many cases of food poisoning. The use of antibiotics remains a main stream control strategy for avian salmonellosis as well as typhoid and paratyphoid fevers in humans. Due to the growing awareness about drug resistance and toxicities, the use of antibiotics is being discouraged in many countries whilst advocating potent benign alternatives such as phyto-based medicine. The objective of this work was to isolate, characterise the bioactive compounds of Canarium schweinfurthii; and evaluate their anti-salmonellal activity. Methods The hydro-ethanolic extract of Canarium schweinfurthii was fractionated and tested for their anti-salmonellal activity. The most active fractions (i.e. chloroform and ethyl acetate partition fractions) were then explored for their phytochemical constituents. Fractionation on normal phase silica gel column chromatography and size exclusion chromatography on Sephadex LH-20 led to the isolation of four compounds (maniladiol, scopoletin, ethyl gallate and gallic acid) reported for the first time in Canarium schweinfurthii. Results Result indicated that scopoletin and gallic acid had greater activity than the crude extracts and partition fractions. Among the isolated compounds, scopoletin showed the highest inhibitory activity with a MIC of 16 μg/ml against Salmonella Typhimurium and Salmonella Enteritidis. Conclusions The overall results of this study indicates that the hydro-ethanolic extract as well as some of isolated compounds have interesting anti-salmonellal activities that could be further explored for the development of potent therapy for salmonellosis. Furthermore, the study adds credence to the folkloric applications of the plant.
    Keywords Ethnomedicine ; Salmonellosis ; Canarium schweinfurthii ; Natural substances ; Other systems of medicine ; RZ201-999
    Subject code 540
    Language English
    Publishing date 2020-10-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Antibacterial activities and toxicological study of the aqueous extract from leaves of Alchornea cordifolia (Euphorbiaceae)

    Merline Namekong Djimeli / Siméon Pierre Chegaing Fodouop / Guy Sedar Singor Njateng / Charles Fokunang / Donald Sedric Tala / Fabrice Kengni / Donatien Gatsing

    BMC Complementary and Alternative Medicine, Vol 17, Iss 1, Pp 1-

    2017  Volume 10

    Abstract: Abstract Background A. cordifolia is a plant widely used in Africa to solve many health problems. In Cameroon, it is used in the treatment of urogenital infections. As a continuation of our search for pharmacologically active agents from natural sources, ...

    Abstract Abstract Background A. cordifolia is a plant widely used in Africa to solve many health problems. In Cameroon, it is used in the treatment of urogenital infections. As a continuation of our search for pharmacologically active agents from natural sources, the antimicrobial activity of A. cordifolia leaf extracts against E. coli and the toxicity of this extract were investigated. Methods The antibacterial activity of the aqueous extract from leaves of Alchornea cordifolia was carried out in vitro on Escherichia coli, as well as in vivo on E. coli-infected rat model. Phytochemical screening was performed using standard methods. The acute toxicity was investigated in mice, while at the end of treatment of infected rats, some biochemical, hematological and histological markers of toxicity were evaluated. Results The extract exhibited a bacteriostatic activity with MIC value of 1500 μg/ml. Phytochemical screening revealed the presence of phenols, tannins, triterpens, flavonoids, alkaloids, anthraquinones, anthocyanins, saponins and coumarins in the extract. The acute toxicity study showed LD50 values of 8.6 g/kg and 3.8 g/kg in male and female mice respectively. In vivo, the oral administration of the extract showed a dose-dependent decrease of the bacterial load as the extract at 232, 112 and 58 g/kg were able to eradicate the infection after 9, 11 and 13 days of treatment. The infected rats showed a significant (p < 0.05) increase in the level of serum creatinine, ALAT, white blood cells, and a significant (p < 0.05) decrease in the level of food and water intake, the relative weight of lungs, heart and spleen. In the treated rats, a significant (p < 0.05) increase in food and water intake and ALAT was observed at the doses of 116 and 232 mg/kg. A decrease in the red blood cells count and serum protein levels was also observed. These observations corroborate liver damages as revealed by the histopathological examination of the cross sections of this organ. Conclusion The results of this assay thus showed ...
    Keywords Alchornea Cordifolia ; E. coli ; Toxicity ; Mice ; Other systems of medicine ; RZ201-999
    Subject code 630
    Language English
    Publishing date 2017-07-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Antisalmonellal and antioxidant potential of hydroethanolic extract of Canarium schweinfurthii Engl. (Burseraceae) in Salmonella enterica serovar Typhimurium-infected chicks

    Jean Baptiste Sokoudjou / Siméon Pierre Chegaing Fodouop / Flavie Gaelle Djoueudam / Norbert Kodjio / Jean Raphaël Kana / Alain Bertrand Fowa / Gabriel Tchuente Kamsu / Donatien Gatsing

    Asian Pacific Journal of Tropical Biomedicine, Vol 9, Iss 11, Pp 474-

    2019  Volume 483

    Abstract: Objective: To evaluate the anti-infectious and antioxidant activities of hydroethanolic extract of Canarium schweinfurthii on broiler chickens infected by Salmonella enterica serovar Typhimurium, known to be threatening public health. Methods: Animals ... ...

    Abstract Objective: To evaluate the anti-infectious and antioxidant activities of hydroethanolic extract of Canarium schweinfurthii on broiler chickens infected by Salmonella enterica serovar Typhimurium, known to be threatening public health. Methods: Animals were divided into six groups of eight animals per group: the normal control group, negative control group, positive control group and three test groups receiving the plant extract at 5, 19 and 75 mg/kg bw, respecively. The evolution of the disease as well as the effectiveness of the treatment were monitored by stool culture from the second day post infection until the end of the treatment. In addition, the effects of treatment on growth performances and feed conversion efficiency of broilers were evaluated. For the assessment of antioxidant status, enzymatic and non-enzymatic biomarkers such as catalase, glutathione peroxidase, malondialdehyde and nitric oxide were evaluated in the serum and tissues of animals. Results: The infected chickens treated with oxytetracycline recovered on day 7 after treatment, while animals treated with 19 and 75 mg/kg of Canarium schweinfurthii extract recovered on day 9 and those with 5 mg/kg of the extract on day 10. Salmonella infection caused a decrease on catalase and glutathione peroxidase activities; the administration of various doses of Canarium schweinfurthii extract increased these enzymatic activities. Animals receiving the extract at 5 mg/kg showed a significant increase in catalase activity in serum, heart and lungs while all concentrations of the extract significantly increased glutathione peroxidase activity in the serum, liver and spleen. Concerning non-enzymatic biomarkers, Salmonella infection caused a significant increase of nitric oxide and malondialdehyde concentration in the liver and lungs. Treatment with 75 mg/kg of the extract significantly reduced nitric oxide concentration in the heart and lungs while each dose of the extract reduced and normalized the malondialdehyde level in the serum. Additionally, ...
    Keywords avian salmonellosis ; antisalmonellal efficacy ; canarium schweinfurthii ; salmonella typhimurium ; antioxidant activity ; Arctic medicine. Tropical medicine ; RC955-962 ; Biology (General) ; QH301-705.5
    Subject code 630
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Antityphoid properties and toxicity evaluation of Harungana madagascariensis Lam (Hypericaceae) aqueous leaf extract

    Kengni, Fabrice / Charles Fokunang / Donald S. Tala / Donatien Gatsing / Merline N. Djimeli / Siméon P.C. Fodouop

    Journal of ethnopharmacology. 2016 Feb. 17, v. 179

    2016  

    Abstract: Harungana madagascariensis Lam is commonly used in Cameroonian folk medicine for the treatment of malaria and typhoid fever.To investigate the therapeutic potentials of H. madagascariensis aqueous leaf extract for the treatment of salmonellosis (e.g. ... ...

    Abstract Harungana madagascariensis Lam is commonly used in Cameroonian folk medicine for the treatment of malaria and typhoid fever.To investigate the therapeutic potentials of H. madagascariensis aqueous leaf extract for the treatment of salmonellosis (e.g. typhoid fever, gastroenteritis).A Salmonella Typhimurium-infected rat model was used. The faeces of these rats were analysed for viable Salmonella Typhimurium before and after infection, and during the treatment period. The physiological, biochemical and histopathological markers of possible side effects of the extract were also studied using standard methods and kits.The in vivo antisalmonellal study revealed that this extract significantly (P<0.05) reduced the number of viable Salmonella Typhimurium recovered from faeces, and could stop salmonellosis after 10 days of treatment for male and female rats, with non-toxic doses. However, the biochemical and histological analyses revealed that at relatively high-doses (≥100mg/kg for females and 200mg/kg for males) the extract could induce liver damage, as illustrated by a rise of serum transaminases (ALT and AST), significant inflammation of the parenchyma and portal vein, as well as cell necrosis. There were also increases in cholesterol levels in both sexes. No significant unwanted side effect of the extract was observed on the kidney, as shown by both serum and urinary creatinine, and urinary protein levels.The results obtained showed that H. madagascariensis has a promising antisalmonellal effect and, therefore, the potential to provide an effective treatment against salmonellosis, including typhoid fever.
    Keywords adverse effects ; alanine transaminase ; animal models ; aspartate transaminase ; blood serum ; cholesterol ; creatinine ; feces ; females ; gastroenteritis ; Harungana madagascariensis ; histology ; histopathology ; inflammation ; kidneys ; leaf extracts ; liver ; malaria ; males ; necrosis ; portal vein ; rats ; Salmonella Typhimurium ; toxicity ; traditional medicine ; typhoid fever ; Cameroon
    Language English
    Dates of publication 2016-0217
    Size p. 137-145.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 134511-4
    ISSN 1872-7573 ; 0378-8741
    ISSN (online) 1872-7573
    ISSN 0378-8741
    DOI 10.1016/j.jep.2015.12.037
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Antidiabetic potential of methanol extracts from leaves of Piper umbellatum L. and Persea americana Mill.

    Guy Sedar Singor Njateng / Sumera Zaib / Larissa Yetenge Chimi / Cesaire Feudjio / Raymond Simplice Mouokeu / Donatien Gatsing / Jules-Roger Kuiate / Ezekiel Adewole / Jamshed Iqbal

    Asian Pacific Journal of Tropical Biomedicine, Vol 8, Iss 3, Pp 160-

    2018  Volume 165

    Abstract: Objective: To determine inhibitory activity of methanolic leaf extract of Piper umbellatum and Persea americana (P. americana) (traditionally used in Cameroon against diabetes) on α -glucosidase, β -glucosidase, maltase-glucoamylase, aldose reductase and ...

    Abstract Objective: To determine inhibitory activity of methanolic leaf extract of Piper umbellatum and Persea americana (P. americana) (traditionally used in Cameroon against diabetes) on α -glucosidase, β -glucosidase, maltase-glucoamylase, aldose reductase and aldehyde reductase activities, enzymes involved in starch digestion or diabetic complications. Methods: The methanol extracts from Piper umbellatum and P. americana were prepared by maceration. To assess relative efficacy of these extracts, the determination of concentrations that were needed to inhibit 50% of enzyme activity was done, whereas, gas chromatography-mass spectrum was used to identify components from extracts that may be responsible for the activities. Results: The tested extracts strongly inhibited α -glucosidase, maltase-glucoamylase, aldose reductase and aldehyde reductase activities with IC50 ranging from (1.07 ± 0.03) to (31.77 ± 1.17) μg/mL. Among the tested extracts, P. americana was the most active against sensitive enzymes (IC50 of 1.07 ± 0.03 to 15.63 ± 1.23). But, none of the extracts showed interesting inhibitory effect against β -glucosidase as their percentage inhibitions were less than 16%. From gas chromatography-mass spectrum analysis, 10 and 8 compounds were identified in Piper umbellatum and P. americana extracts respectively, using NIST library 2014. Conclusions: Results of this study provide the scientific credential for a prospective usage of these plants to treat diabetes.
    Keywords piper umbellatum ; persea americana ; glucosidase ; maltase-glucoamylase ; aldose reductase ; aldehyde reductase ; Arctic medicine. Tropical medicine ; RC955-962 ; Biology (General) ; QH301-705.5
    Subject code 540
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: In vivo anti-salmonella activity of aqueous extract of Euphorbia prostrata Aiton (Euphorbiaceae) and its toxicological evaluation

    Donald Sédric Tala / Donatien Gatsing / Siméon Pierre Chegaing Fodouop / Charles Fokunang / Fabrice Kengni / Merline Namekong Djimeli

    Asian Pacific Journal of Tropical Biomedicine, Vol 5, Iss 4, Pp 310-

    2015  Volume 318

    Abstract: Objective: To investigate the in vivo anti-salmonella activity and the safety of aqueous extract of Euphorbia prostratra (E. prostratra), a plant commonly used in Cameroon by traditional healers. Methods: A Salmonella typhimurium-infected rat model was ... ...

    Abstract Objective: To investigate the in vivo anti-salmonella activity and the safety of aqueous extract of Euphorbia prostratra (E. prostratra), a plant commonly used in Cameroon by traditional healers. Methods: A Salmonella typhimurium-infected rat model was used for the study. The physiological, biochemical and histopathological markers of possible side effects of this extract were studied using standard methods. Results: The extract had a significant effect on the number of viable Salmonella typhimurium recovered from faeces, and could stop salmonellosis after 8 and 10 days of treatment for male and female rats, respectively, with non-toxic doses. However, the biochemical and histopathological analyses revealed that at relatively high doses (≥ 73.48 mg/kg for female and ≥ 122.71 mg/kg for male) the extract could induce liver damage, as illustrated by a rise of serum transaminases’ levels and significant inflammation of the parenchyma and portal vein. Side effects were also observed on the kidneys, as shown by both serum and urinary creatinine, and urinary proteins. Conclusions: The overall results indicate that the aqueous extract of E. prostrata has the potential to provide an effective treatment for salmonellosis, including typhoid fever. However, it is necessary to extrapolate these results in large animals, in further studies.
    Keywords Euphorbia prostrata Ait ; Typhoid fever ; Salmonella ; Safety ; Arctic medicine. Tropical medicine ; RC955-962 ; Biology (General) ; QH301-705.5
    Subject code 630
    Language English
    Publishing date 2015-04-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Chemical constituent, antibacterial and antioxidant activity of crude extract and oil fraction of L. abyssinica

    Fodouop Chegaing Pierre / Donatien Gatsing / Gerald Ngo Teke / Xavier Cheseto / Benjamin Talom Tangue / Jules-Roger Kuiate / Baldwin Torto

    International Journal of Phytomedicine, Vol 6, Iss 2, Pp 170-

    2014  Volume 176

    Abstract: The antibacterial and antioxidant activities of CH3Cl/MeOH crude extract and a nonpolar fraction from the CHCl 3 phase of Ludwigia abyssinica were investigated using broth dilution method and 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical scavenging assay ...

    Abstract The antibacterial and antioxidant activities of CH3Cl/MeOH crude extract and a nonpolar fraction from the CHCl 3 phase of Ludwigia abyssinica were investigated using broth dilution method and 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical scavenging assay respectively. Chemical composition was determined by gas chromatography coupled with mass spectrometry using Agilent Technologies 7890A GC system-Agilent Technologies 5975C inert XL EI/CI MSD. Bioassays show that L. abyssinica is active on the different test organisms with the MIC ranging from 0.5 to 1.5 mg/ml for the crude extract and 0.2 to 0.5 mg/ml for the non polar oil fraction. The oil extract of L. abyssinica exhibited a good antioxidant activity with radical scavenging activity (IC 50 ) = 89.18 µg/ml which is about 1.5 times the antioxidant activity of ascorbic acid used as control, while that of crude extract was 413.74 µg/ml. From the gas chromatography coupled with mass spectrometry analyses, 12 hydrocarbons were identified with octadecane (5.67%), pentadecane (6.87%) and squalene (57.18%) the major components. These results offer a plat form of using L. abyssinica for alternative and complementary medicine.
    Keywords Ludwigia abyssinica ; GC-MS ; Column chromatography ; antioxidant ; antibacterial ; Medicine (General) ; R5-920 ; Medicine ; R
    Subject code 540
    Language English
    Publishing date 2014-05-01T00:00:00Z
    Publisher Advanced Research Journals
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: In vitro allelopathic effects of extracts and fractions of five plants on tomato seed germination and vigor index

    Pélagie Michelin, Komguem Tagne / Jean, Aghofack-Nguemezi / Donatien, Gatsing / Paul Keilah, Lunga / Stephen, Lacmata Tamekou / Jules-Roger, Kuiate / Sabatini, Sabrina

    Cogent biology. 2016 Dec. 31, v. 2, no. 1

    2016  

    Abstract: In nature, allelopathic substances are likely to influence the germination of seeds. Callistemon viminalis, Tephrosia vogelii, Senna spectabilis, Cupressus lusitanica, and Polyscias fulva are found around some tomato culture fields in Cameroon. These ... ...

    Abstract In nature, allelopathic substances are likely to influence the germination of seeds. Callistemon viminalis, Tephrosia vogelii, Senna spectabilis, Cupressus lusitanica, and Polyscias fulva are found around some tomato culture fields in Cameroon. These plants may produce allelochemicals that can influence tomato seed germination and seedling characteristics. Methanol extracts and their fractions were prepared from leaves of these plants and tested on seed germination rate, shoot diameter, root and stem lengths, and vigor index of seedlings. The tested substances did not significantly (p > 0.05) affect the seed germination rate. Aqueous extracts of T. vogelii, C. lusitanica, and C. viminalis exerted the highest inhibition on seed germination while methanol extract, hexane, and ethyl acetate fractions of all the plants induced significant increases in diameters of seedlings. Aqueous extracts were effective on the stem length. All treatments generally reduced the root length. Methanol extracts induced significantly higher vigor indices (p < 0.05).
    Keywords Callistemon viminalis ; Cupressus lusitanica ; Polyscias ; Tephrosia vogelii ; allelochemicals ; ethyl acetate ; hexane ; methanol ; seed germination ; seedlings ; tomatoes ; vigor ; Cameroon
    Language English
    Dates of publication 2016-1231
    Publishing place Cogent
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2837326-1
    ISSN 2331-2025
    ISSN 2331-2025
    DOI 10.1080/23312025.2016.1220661
    Database NAL-Catalogue (AGRICOLA)

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