Evaluation of Wound Healing Activity of Hydromethanolic Crude Extract and Solvent Fractions of the Root of Verbascum Sinaiticum Benth. (Scrophulariaceae) in Swiss Albino Mice.

Background: The roots of Verbascum sinaiticum have been used traditionally for the management of wound in different regions of Ethiopia. Despite the presence of several claims and in vitro studies regarding its role in wound healing, no scientific studies have been conducted so far. Therefore, this study aims to scientifically evaluate the wound healing activities of the crude extract and solvent fractions of the roots of Verbascum sinaiticum in Swiss albino mice. Methods: The dried root powder of Verbascum sinaiticum was extracted using 80% methanol by maceration technique. This was then fractionated with chloroform, ethyl acetate, and water. These extracts were formulated as ointment at 5% and 10% concentration by using simple base. Acute dermal toxicity was performed on mice. The wound healing potential was evaluated using excision, incision, and burn wound models. Results: In excision wound, 10% and 5% of crude extract ointment provided a significant (P<0.001) percentage of contraction starting from day 4 and day 6 onwards respectively. Moreover, the rate of epithelialization was significantly (P<0.001) improved in 10% crude extract. In burn wound, 10% and 5% crude extract showed significant (P<0.001) wound contraction starting from day 4 and 8 onwards respectively. In both excision and burn wounds, a moderate concentration of fibroblast proliferation and collagen deposition was observed on the 10% crude extract. The 5% and 10% aqueous and ethyl acetate fractions produced a significant (P<0.001) percentage of wound contraction and shortening of epithelialization at different time points compared to simple ointment. Conclusion: The results of this study demonstrated that the 80% methanolic crude extract, aqueous and ethyl acetate fractions of Verbascum sinaiticum root have wound healing potential which assimilates its traditional use.

Antimalarial Activity of Solvent Fractions of the Stem Bark of Periploca linearifolia Quart.-Dill. & A.Rich. (Asclepiadaceae) Against Plasmodium berghei in Mice.

BACKGROUND: Currently, malaria elimination is intimidated by the emergence of antimalarial drug and insecticide resistance. This scenario urges scientists to develop new antimalarial drugs, where plant-based compounds are the major candidates. OBJECTIVE: The objective of this experiment was to examine the antimalarial activities of the solvent fractions of the stem bark of P. linearifolia in mice. METHODS: The dried hydromethanolic extract was treated with n-hexane, chloroform, and ethyl acetate solvents based on increasing order of polarity. For the suppressive test, after three hours post-inoculation of P. berghei, the first group was administered the vehicle 2 mL/100 g. The second group was given chloroquine 25 mg/kg, whereas the remaining nine groups were administered 100, 200, and 400 mg/kg of each of the chloroform, ethyl acetate and aqueous fractions. Furthermore, the aqueous fraction was evaluated using Rane's model for the curative test. The result was statistically analyzed using a one-way analysis of variance (ANOVA). The results were considered significant at P < 0.05. RESULTS: In the suppressive test, the solvent fractions suppressed parasitemia level significantly (P < 0.01 for 100 mg/kg, P < 0.001 for 200 and 400 mg/kg of the aqueous and P < 0.01 for 200 mg/kg, P < 0.001 for 400 mg/kg of chloroform fractions) as compared to vehicle-treated mice, whereas in the curative model 400 mg/kg of the aqueous fraction (P < 0.01) showed a significant parasitemia level reduction. CONCLUSION: The results of this study indicated that the solvent fractions have promising antiplasmodial activity against Plasmodium berghei, which is consistent with the earlier in vivo study of the hydromethanolic extract.

Laxative Activities of 80% Methanolic Extract of the Leaves of Grewia ferruginea Hochst Ex A Rich in Mice.

BACKGROUND: There are numerous medicinal plants including the leaves of Grewia ferruginea used as traditional medicine for the treatment of constipation. This study was conducted to evaluate the laxative activity of the leaves of G ferruginea. METHODS: The laxative activity of the leaves of G ferruginea was tested using 3 models: laxative activity, gastrointestinal motility, and gastrointestinal secretion tests. The effect of the plant extract on mean number of feces, fecal water content, ratio of intestinal distance traveled by the charcoal meal and intestinal fluid accumulation were evaluated and analyzed. RESULTS: Significant increase was observed in the mean weight of wet fecal matter at 200 (1.00 ± 0.03 g, P < .05) and 400 mg/kg (1.01 ± 0.02 g, P < .01), relative to loperamide constipated negative control group. Similarly, percent fecal water content was significantly improved in extract treated groups at 100 mg/kg (52.10% ± 2.04%, P < .05), 200 mg/kg (54.02% ± 2.15%, P < .01), and 400 mg/kg (54.25% ± 2.50%, P < .01) compared with the negative control group. The gastroinestinal transit ratio was also significantly increased with 200 mg/kg (P < .01) and 400 mg/kg (P < .001) of the extract relative to the constipated negative control. The crude extract showed significant increase in intestinal fluid accumulation at 200 mg/kg (0.48 ± 0.07 g, P < .05) and 400 mg/kg (0.51 ± 0.08 g, P < .01) compared with the negative control. CONCLUSION: The results of the present study indicated that 80% methanol extract of the leaves of G ferruginea possessed significant laxative activity. As such, this study corroborates the traditional claim of using G ferruginea in the treatment of constipation.

Knowledge, attitude and practices of medical and health science students on the antiretroviral based HIV post-exposure prophylaxis in an Ethiopian hospital: an institutional based cross-sectional study.

BACKGROUND: HIV/AIDS in resource-limited settings poses a high risk of occupational exposure to healthcare workers due to higher number of HIV infected patients. Hence, antiretroviral based post-exposure prophylaxis (PEP) for HIV is very crucial. The aim of the study was to determine the knowledge, attitudes, and practices of medical and Health science students on antiretroviral based HIV PEP in University of Gondar comprehensive specialized hospital (UOGCSH), Northwestern Ethiopia. METHODS: An institutional-based cross-sectional study was conducted among 220 medical and health science graduating students in UOGCSH from May to July 2015. Data were collected using a self-administered pretested questionnaire. The collected data were analyzed using SPSS software version 22. Results were summarized in frequencies, percentages, and means with standard deviations and presented using tables or figures. RESULTS: Among the respondents, only sixty-six (30%) of the 220 study participants has had adequate knowledge about HIV PEP. Furthermore, over 90 % of the students had positive attitude towards HIV PEP f. Out of the total respondents, 37/220 (16.8%) were in need of HIV PEP and of these students only 18/37 (48.6%) took PEP. On the other hand, merely 50% of the study subjects completed the full course of HIV PEP, while the rest 50% failed to finish. As to the respondents self-report, the sole reason for starting but failing to complete the full course of HIV PEP was intolerance to the side effects of antiretroviral. CONCLUSIONS: Although majority of the respondents had poor knowledge and practice, they owned a good attitude towards HIV PEP. Therefore, a pre-service intensive training for all students regarding HIV PEP prior to their clinical attachments is mandatory. In addition, potential side effects of ARTs and its managements should be priory informed to the students so as to prevent the associated non-adherence to ultimately reduce the incidence of drug resistance. Moreover, the habit of needle stick injury reporting was found to be poor that needs due improvement and there has been also a pressing need to supply sufficient protective barriers to the students while planning and rendering services.

Antimalarial Activity of Stem Bark of Periploca linearifolia during Early and Established Plasmodium Infection in Mice.

BACKGROUND: In Ethiopia, stem bark of Periploca linearifolia is used for the treatment of malaria by the local community and demonstrated antimalarial activity in vitro. Despite its in vitro antimalarial activity, no scientific study has been carried out to verify its activity in vivo. Therefore, the aim of the study was to evaluate the antimalarial activity of Periploca linearifolia stem bark extract in mice. METHODS: The dried stem bark of Periploca linearifolia was extracted with 80% methanol and evaluated for its antimalarial activity on both early and established Plasmodium berghei infected mice. The extract was prepared at graded doses of 200, 400, and 600 mg/kg. Chloroquine and distilled water were administered to the positive and negative control groups, respectively. RESULTS: The crude extract, at all tested doses, suppressed parasitemia significantly (p < 0.05) for 200 and 400 mg/kg and (p < 0.001) for 600 mg/kg. The suppression values at these doses were 56.98, 43.33, and 38.17 percent, respectively. Periploca linearifolia extract also demonstrated schizonticidal activity in the established malaria infection. CONCLUSION: The plant Periploca linearifolia has a promising antimalarial activity in mice, supporting its in vitro finding. Thus, it could be considered as a potential source to develop new antimalarial agent.

Antidiarrheal Activity of 80% Methanolic Leaf Extract of Justicia schimperiana.

BACKGROUND: Diarrhea is one of the leading causes of preventable death in developing countries and mainly affects children and infants. It has been reported that the leaf of Justicia schimperiana is used as an antidiarrheal agent in Libo Kemekem district, northwest Ethiopia. METHOD: The 80% methanolic leaf extract of J. schimperiana was evaluated for its activity against castor oil-induced diarrhea, enteropooling, and gastrointestinal motility in mice. RESULTS: Significant reduction (p < 0.001) in the total defecation and diarrheal drops was produced by all the test doses of the extract. Percentage inhibition of wet feces was 42.58, 65.07, and 74.96% at 100, 200, and 400 mg/kg doses of the extract, respectively. The extract also significantly inhibited castor oil-induced enteropooling at all test doses. The percent reduction in mean weight of intestinal contents was 66.96, 67.83, and 76.52% at 100, 200, and 400 mg/kg doses of the extract, respectively. The extract significantly reduced gastrointestinal movement of charcoal meal as well at 200 (p < 0.01) and 400 mg/kg (p < 0.001) doses. CONCLUSION: In conclusion, the methanolic leaf extract of J. schimperiana has an antidiarrheal activity and this supports the use of this plant in the treatment of diarrhea in the traditional settings.

Antimalarial activity of Syzygium guineense during early and established Plasmodium infection in rodent models.

BACKGROUND: In Ethiopia, the leaves of Syzygium guineense have been found useful for the prevention and cure of malaria, and demonstrated antiplasmodial activity in vitro. Nevertheless, no scientific study has been conducted to confirm its antimalarial activity in vivo. Therefore, the objective of the study was to evaluate the antimalarial effect of Syzygium guineense leaf extract in mice. METHODS: Inoculation of the study mice was carried out by using the malaria parasite, Plasmodium berghei. The plant extract was prepared at 200, 400 and 600 mg/kg. Chloroquine and distilled water was administered to the positive and negative control groups respectively. Parameters like parasitaemia, survival time and body weight were determined following standard tests (4-day suppressive, Rane's and repository tests). RESULTS: Syzygium guineense crude leaf extract displayed considerable (p < 0.05) parasite suppression at doses of 600 and 400 mg/kg in a 4-day suppressive test with chemosuppressive value of 59.39 and 49.09% respectively. S. guineense crude leaf extract also showed dose-dependent schizontocidal activity in both the repository and curative tests. The extract also prevented body weight loss and prolonged survival date of mice significantly (P < 0.05) at the highest dose employed in the study. Qualitative chemical assay for S. guineense methanolic leaf extract revealed that the plant is endowed with different plant secondary metabolites exemplified by terpenoids, alkaloids, triterpenes, flavonoids, anthraquinones, tannins, glycosides, saponins and phenols. CONCLUSION: Syzygium guineense leaf extract possess antimalarial activity in mice. The test substance was found to be safe with no observable signs of toxicity in the study mice. The results of the present work confirmed the in vitro antiplasmodial finding and traditional claims in vivo in mice. Therefore, Syzygium guineense could be regarded as a potential source to develop safe, effective and affordable antimalarial agent.