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    Effect of aqueous extract and anthocyanins of calyces of Hibiscus sabdariffa (Malvaceae) in rats with adenine-induced chronic kidney disease
    (Wiley, 2017) Ali, Badreldin H.; Cahlikova, Lucie; Opletal, Lubomir; Karaca, Turan; Manoj, Priyadarsini; Ramkumar, Aishwarya; Al Suleimani, Yousuf M.
    ObjectivesThe aim of this work was to assess the possible beneficial effects of aqueous extracts of Hibiscus sabdariffa L. calyces and anthocyanins isolated therefrom in an adenine-induced chronic kidney disease (CKD) model. MethodsRats were orally given, for 28 consecutive days, either adenine alone or together with either aqueous extract of H. sabdariffa calyces (5 and 10%) or anthocyanins (50, 100 and 200 mg/kg of anthocyanin concentrate). For comparative purposes, two groups of rats were given lisinopril (10 mg/kg). Key findingsWhen either H. sabdariffa aqueous extract or the anthocyanins isolated from it was administered along with adenine, the adverse effects of adenine-induced CKD were significantly lessened, mostly in a dose-dependent manner. The positive effects were similar to those obtained by administration of lisinopril. ConclusionsThe results obtained show that both H. sabdariffa and its anthocyanins could be considered as possible promising safe dietary agents that could be used to attenuate the progression of human CKD. This could have added significance as H. sabdariffa tea is widely consumed in many parts of Africa and Asia and is thus readily available.
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    The effect of the dipeptidyl peptidase-4 inhibitor sitagliptin on gentamicin nephrotoxicity in mice
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2018) Al Suleimani, Yousuf M.; Abdelrahman, Aly M.; Karaca, Turan; Manoj, Priyadarsini; Ashique, Mohammed; Nemmar, Abderrahim; Ali, Badreldin H.
    This study aimed at investigating the possible ameliorative effects of sitagliptin in mice with gentamicin (GEN) nephrotoxicity. Sitagliptin was given to the animals at an oral dose of 10 mg kg(-1) per day for 10 days, and in some of these mice, GEN was injected intraperitoneally at a dose of 100 mg kg(-1) per day during the last seven days of the treatment. Nephrotoxicity was evaluated histopathologically by light microscopy and biochemically by measuring several indices in plasma, urine and renal cortex homogenates. GEN treatment induced nephrotoxicity as evidenced by significantly (P < 0.0001) increasing the plasma concentrations of urea, creatinine, circulatory cytokines, cystatin C, sclerostin, and TNF alpha. Treatment with GEN also significantly elevated urinary N-acetyl-beta-D glucosaminidase (NAG) concentration (P < 0.0001). Moreover, GEN caused significant increase in oxidative stress in the kidneys (P < 0.0001). Histopathological examination revealed massive tubular injury, necrosis, infiltration of inflammatory cells and intraluminal hyaline casts in mice treated with GEN. Sitagliptin alone did not significantly affect any of the indices measured. However, concomitant treatment with sitagliptin and GEN significantly mitigated most of the nephrotoxic actions of GEN. Pending further studies, sitagliptin may potentially be useful as a nephroprotectant agent.