Browsing by Author "Gavamukulya, Yahaya"

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    Annona muricata silver nanoparticles exhibit strong anticancer activities against cervical and prostate adenocarcinomas through regulation of CASP9 and the CXCL1/CXCR2 genes axis
    (IOS Press, 2021) Gavamukulya, Yahaya; Mainab, Esther N.; El-Shemy, Hany A.; Merokac, Amos M.; Kangogo, Geoffrey K.; Magomab, Gabriel; Wamunyokoli, Fred
    BACKGROUND: Green synthesized nanoparticles have been earmarked for use in nanomedicine including for the development of better anticancer drugs. OBJECTIVE: The aim of this study was to undertake biochemical evaluation of anticancer activities of green synthesized silver nanoparticles (AgNPs) from ethanolic extracts of fruits (AgNPs-F) and leaves (AgNPs-L) of Annona muricata. METHODS: Previously synthesized silver nanoparticles were used for the study. The effects of the AgNPs and 5-Fluorouracil were studied on PC3, HeLa and PNT1A cells. The resazurin, migration and colonogenic assays as well as qRT-PCR were employed. RESULTS: The AgNPs-F displayed significant antiproliferative effects against HeLa cells with an IC50 of 38.58 g/ml and PC3 cells with an IC50 of 48.17 g/ml but selectively spared normal PNT1A cells (selectivity index of 7.8), in comparison with first line drug 5FU and AgNPs-L whose selectivity index were 3.56 and 2.26 respectively. The migration assay revealed potential inhibition of the metastatic activity of the cells by the AgNPs-F while the colonogenic assay indicated the permanent effect of the AgNPs-F on the cancer cells yet being reversible on the normal cells in contrast with 5FU and AgNPs-L. CASP9 was significantly over expressed in all HeLa cells treated with the AgNPs-F (1.53-fold), AgNPs-L (1.52-fold) and 5FU (4.30-fold). CXCL1 was under expressed in HeLa cells treated with AgNPs-F (0.69-fold) and AgNPs-L (0.58-fold) and over expressed in cells treated with 5FU (4.95-fold), but the difference was not statistically significant. CXCR2 was significantly over expressed in HeLa cells treated with 5FU (8.66-fold) and AgNPs-F (1.12-fold) but under expressed in cells treated with AgNPs-L (0.76-fold). CONCLUSIONS: Here we show that biosynthesized AgNPs especially AgNPs-F can be used in the development of novel and better anticancer drugs. The mechanism of action of the AgNPs involves activation of the intrinsic apoptosis pathway through upregulation of CASP9 and concerted down regulation of the CXCL1/ CXCR2 gene axis. Keywords: Silver nanoparticles, HeLa, PC3, PNT1A, CASP9, CXCL1/CXCR2
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    Sero-prevalence and factors associated with helicobacter pylori infection in a rural population in eastern Uganda:
    (Primary Health Care: Open Access, 2021) Nekaka, Rebecca; Oboth, Paul; Nteziyaremye, Julius; Gavamukulya, Yahaya; Ssenyonga, Lydia VN; Iramiot, Jacob Stanley
    Background: Globally, 50% or more of the world’s population is infected with Helicobacter pylori making it the most widely spread bacteria across the world. The low developed countries are more overburdened by Helicobacter pylori infection than the developed countries. H. pylori infection is associated with duodenal ulcer, chronic atrophic gastritis (CAG), lymphomas, and adenocarcinoma. This study reports the prevalence of H. pylori and itsassociated factors in Eastern Uganda. Materials and methods: A cross-sectional study involving 275 participants was carried out in eastern Uganda. H. pylori serology was done and face to face interviewer-administered questionnaire were used for data collection. Data were entered in Microsoft Excel and imported to Stata version 14 for analysis and a P value of <0.05 was considered statistically significant. Results: The seroprevalence of H. pylori was 27.3% (75/275) with 28.4% (50/176) of the females being positive compared to 25.3% (25/99) of the males. Consumption of animal products (meat, milk, and eggs) was the only statistically significant factor associated with H. pylori seropositivity (P <0.001, 95% CI =1.934-4.209, AOR=2.85). Conclusion: The H. pylori seroprevalence is high in eastern Uganda. Consumption of animal products was a positive predictor of infectivity. Keywords: Helicobacter pylori • Animal products • Seroprevalence • Kibuku • Eastern Uganda
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    Sub-Acute toxicity effects of methanolic stem bark extract of entada abyssinica on biochemical, haematological and histopathological parameters in wistar albino rats
    (Frontiers in pharmacology, 2021) Obakiro, Samuel Baker; Kiprop, Ambrose; Kigondu, Elizabeth; K’owino, Isaac; Kiyimba, Kenedy; Kato, Charles Drago; Gavamukulya, Yahaya
    Background: Whereas the efficacy of Entada abyssinica (fabaceae) extracts against various ailments has been scientifically validated, its safety has not been established. This study was undertaken to evaluate the toxicity effects of methanolic stem bark extract of E. abyssinica on biochemical, haematological and histological parameters of Wistar albino rats following repeated oral administration. Methods: Wistar albino rats of both sexes were randomized into groups and orally administered daily with determined doses (150, 300 and 600 mg/kg) of E. abyssinica methanolic extract using 1% tween 80 in distilled water as a control for 28 days. On the 29th day, all the animals were sacrificed and dissected to collect blood and selected organs. The serum and whole blood were assayed for biochemical and haematological parameters respectively while selected organs were examined for histopathological lesions. Numerical data was analyzed using graph pad prism and expressed as mean ± standard error of mean. The differences between the treatment and control groups were tested for statistical significance using one-way analysis of variance and/or Student’s t-test. Results: In repeated daily oral doses (150, 300 and 600 mg/kg), the methanolic stem bark extract of E. abyssinica did not cause significant alteration in majority of the biochemical and hematological indices. However, the extract significantly elevated the level of uric acid (all doses), aspartate aminotransferase (300 and 600 mg/kg), low density lipoproteins (150 mg/kg) and mean corpuscular heamoglobin concentration (all doses). On the other hand, the extracts reduced high density lipoproteins (150 and 300 mg/kg), mean corpuscular volume (all doses), haematocrit (150 and 600 mg/kg), mean platelet volume (150 and 600 mg/kg) and procalcitonin (150 mg/kg). In the vital organs, therewere no significant lesions observed except at the highest dose (600 mg/kg) where there was mild evidence of lymphocyte infiltration in the liver and focal interstitial nephritis. Conclusion: The methanolic stem bark extract of E. abyssinica is relatively safe in Wistar albino rats when repetitively administered orally in small doses for a prolonged period of time. We recommend more chronic toxicity studies and clinical trials on herbal remedies containing this plant to ensure that its use is free of potential toxicity to humans. Keywords: toxicity, fabaceae, traditional medicine, Entada abyssinica, biochemical, haematological, histopathalogical, wistar albina rats