Browsing by Author "Omotesho, Quadri"

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    Acute Toxicity Study and Evaluation of the Anxiolytic Activity of the Ethanol Leaf Extract of Bryophyllum Pinnatum (Kurz) in Mice
    (Journal of Pharmaceutical Research, Development and Practice, 2019-04) Amali, Mohammed; Atunwa, Soliu; Aiyelero, Medinat; Usman, Shukurat; Olapade, Akeem; Oyedotun, Eniola; Omotesho, Quadri
    Introduction: Anxiety is a psychiatric disorder and identified as the most common stress-related mood disorders causing disability and premature death. Due to the several adverse effects of conventional anxiolytics that have reduced the compliance tendencies of patients, alternative therapies are being sought. Although, studies have shown relative central nervous system effects of different fractions of Bryophyllum pinnatum, no study has specifically evaluated the anxiolytic activity of the ethanol leaf extract of the plant (EEBP) hence, this study. Materials and Methods: Mice (22–25 g) were randomly distributedinto six groups (n = 5) and administered thus: Group I and II received intraperitoneally 1 mL/kg saline and 1 mg/kg diazepam as negative and positive controls respectively whereas Groups III, IV, V and VI received oral doses of 250 mg/kg, 500 mg/kg, 1000 mg/kg, and 2000 mg/kg of B. pinnatum extract respectively followed by open field (OF) paradigm procedure. Similarly, the pattern of EEBP administration was repeated for the mice and then subjected to Elevated Plus Maze (EPM) test. Data were expressed as Mean ± Standard Error of Mean (SEM) using one-way analysis of variance (ANOVA) followed by the Student-Newman-Keuls test. Results were regarded as significant at values of P < 0.05. Result: LD50 of EEBP is greater than 2000 mg/kg. EEBP exhibited a significant decrease in locomotion and rearing of mice at 500 mg/kg and 2000 mg/kg respectively. Contrarily, a significant increase in the duration of time spent by the mice in the open arm was observed at 1000 mg/kg whereas, none of the treated doses showed a significant reduction in the frequencies of entries in the EPM paradigm. However, EEBP showed a reduction in the index of open arm avoidance compared to the saline group. Conclusion: EEBP exhibited dose-dependent inhibitory central effects and may possess potential anxiolytic effect. However, further studies are required to determine its molecular mechanism of action ___________________________________________________________________________ Keywords: Bryophyllum pinnatum, anxiolytics, elevated plus maze, Open Field test, Open Arm Avoidance Index
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    Assessment of anxiolytic potential and acute toxicity study of Combretum micranthum G. Don. leaves (Combretaceae)
    (Journal of Medicinal Plants for Economic Development, 2020-12-18) Amali, Mohammed; Atunwa, Soliu; Omotesho, Quadri; Oyedotun, Eniola; Olapade, Akeem
    Background: Combretum micranthum G. Don. (Combretaceae) is an ethnomedicinally valuable, undomesticated and indigenous shrub of West Africa. However, its anxiolytic potential have not been reported despite its ethanolic extract being used ethnomedicinally in the management of anxiety disorders. Aim: To determine the acute toxicity effect and assess the behavioural effects and anxiolytic potential of C. micranthum G. Don. leaves in mice. Settings: This study is an experimental design to evaluate the ethnomedicinal claim of Combretum micranthum G. Don using animal models of anxiety. Methods: Fifty-six male and female mice, ranging in weight between 20 g and 30 g were randomly distributed into three main groups. The first group of mice (n = 6) was assigned for toxicity assessment (LD50) study using the guideline of Organization for Economic Cooperation and Development (OECD). The second group of mice for behavioural study (n = 25) was further divided into five sub-groups. Sub-groups I, II and III were orally administered 500 mg/kg, 1000 mg/kg, 2000 mg/kg of ethanolic extract of C. micranthum (CmEE), respectively, whilst IV and V were intraperitoneally administered 1 mg/kg diazepam and normal saline 0.5 mL, respectively. They were thereafter evaluated for novelty-induced behaviours: locomotion, rearing and grooming using Open Field Test (OFT). The third group of mice (n = 25) was treated similar to the pattern used in behavioural study and evaluated for anxiolytic activity of CmEE using elevated plus maze (EPM) model. Data were expressed as mean ± standard error of mean (S.E.M) and analysed using Student’s-t test, and one-way analysis of variance (ANOVA) followed by Student–Newman– Keuls (SNK) test with values of p < 0.05 considered significant. Results: The percentage yield of ethanolic leaf extract of C. micranthum was 14.28% weight/ weight (w/w). Combretum micranthum showed no toxicity when administered orally to mice (LD50 ≥ 2000 mg/kg). Groups administered 500, 1000 and 2000 mg/kg of CmEE exhibited decreased locomotion (p < 0.05) when compared with saline group. There was significant decrease in rearing at 2000 mg/kg but increase in grooming in mice administered 2000 mg/kg of CmEE was recorded. The groups administered 500, 1000 and 2000 mg/kg of CmEE showed increased percentage time spent in the open arm in a dose-dependent pattern (33.3%, 41.6% and 55.4%, respectively) when compared with the saline group. There were significant dosedependent decreases in the indices of open arm avoidance at 1000 (48.9) and 2000 mg/kg (41.4) of CmEE. Conclusion: Combretum micranthum is non-toxic and preliminary data indicated that it possesses anxiolytic potential. However, it is recommended that further assays using other specific models of anxiety to determine its probable mechanism(s) of action should be explored. Keywords: Combretum micranthum; Combretaceae; anxiety disorders; elevated plus maze; open field test; locomotion; rearing; grooming; index of open arm avoidance.