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43 result(s) for "Polat, Ipek"
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Antiproliferative effect of Potentilla fulgens on glioblastoma cancer cells through downregulation of Akt/mTOR signaling pathway
ABSTRACT Background: Glioblastoma multiforme (GBM) is the most aggressive brain tumor that is common among adults. This aggression is due to increased invasion, migration, proliferation, angiogenesis, and decreased apoptosis. Plant-based compounds have a high potential to be used as an anticancer agent due to their various mechanisms and less undesirable side effects. Potentilla fulgens is a medicinal plant, and methanolic root extract of P. fulgens (PRE) has anti-inflammatory and anticancer properties. Objective: In this study, we aimed to investigate antiproliferative effect of PRE on U118 and T98G glioblastoma cancer cells and to reveal which molecular signaling pathways regulate this mechanism of action. Materials and Methods: The effect of PRE on cell viability of GBM cells was investigated by MTT assay. Involvement of PRE with cell growth and survival signaling pathways, phosphatidylinositol 3-kinase (PI3K)/Akt/mTOR and c-Src/signal transducer and activator of transcription 3 (STAT3), was examined using Western Blot. Results: PRE reduced cell viability of GBM and human dermal fibroblast (HDF) cells in a dose-and time-independent manner. PI3K expression/phosphorylation level remained unchanged in both GBM and HDF cells after PRE treatment, but Akt/mTOR signaling pathway was downregulated in PRE-treated cells. PRE treatment did not affect c-Src expression/phosphorylation level in GBM cells; however, expression of c-Src was suppressed in HDF cells. Similar results were observed for STAT3 expression and phosphorylation status. Conclusion: PRE has the ability to suppress cell viability in GBM cells, by targeting the Akt/mTOR signaling pathway.
The effects of Mannheimia haemolytica and albendazole on marbofloxacin pharmacokinetics in lambs
The study aimed to define the effects of M. haemolytica and a single oral dose of albendazole on the single-dose pharmacokinetics of marbofloxacin in lambs. The pharmacokinetic–pharmacodynamic integration of marbofloxacin was applied to describe a 3 mg/kg intramuscular dose in lambs. The 6 healthy and 12 naturally infected with M. haemolytica lambs (Akkaraman, males weighing 10–15 kg and aged 2–3 months) were used in this study. In the marbofloxacin group, 6 healthy lambs received marbofloxacin. In the albendazole group after 2 weeks washout period, the same animals received marbofloxacin on 1 h after albendazole. In the diseased marbofloxacin group, 6 lambs naturally infected with M. haemolytica received marbofloxacin. In the diseased albendazole group, 6 lambs naturally infected with M. haemolytica received marbofloxacin on 1 h after albendazole. The marbofloxacin and albendazole were administered each as a single dose of 3 mg/kg intramuscular and 7.5 mg/kg oral, respectively, in the respective groups. Plasma concentration of marbofloxacin was measured with HPLC-UV and pharmacokinetic parameters were analyzed by non-compartmental model. Albendazole did not change the pharmacokinetic profiles of marbofloxacin in healthy and diseased lambs. However, M. haemolytica affected the pharmacokinetics of marbofloxacin in diseased lambs, AUC0–24/MIC90 ratio was not found to be higher than 125, but Cmax/MIC90 ratios was found to be higher than 10 for an MIC value of 0.25 μg/mL in all groups. The marbofloxacin dose described in this study may not be effective for the treatment of infections due to M. haemolytica in lambs, with MIC ≤ 0.25 μg/mL.
Mitochondrial DNA disorders in neuromuscular diseases in diverse populations
Neuromuscular features are common in mitochondrial DNA (mtDNA) disorders. The genetic architecture of mtDNA disorders in diverse populations is poorly understood. We analysed mtDNA variants from whole‐exome sequencing data in neuromuscular patients from South Africa, Brazil, India, Turkey and Zambia. In 998 individuals, there were two definite diagnoses, two possible diagnoses and eight secondary findings. Surprisingly, common pathogenic mtDNA variants found in people of European ancestry were very rare. Whole‐exome or ‐genome sequencing from undiagnosed patients with neuromuscular symptoms should be re‐analysed for mtDNA variants, but the landscape of pathogenic mtDNA variants differs around the world.
Antiproliferative effect of Potentilla fulgens on glioblastoma cancer cells through downregulation of Akt/mTOR signaling pathway
Glioblastoma multiforme (GBM) is the most aggressive brain tumor that is common among adults. This aggression is due to increased invasion, migration, proliferation, angiogenesis, and decreased apoptosis. Plant-based compounds have a high potential to be used as an anticancer agent due to their various mechanisms and less undesirable side effects. Potentilla fulgens is a medicinal plant, and methanolic root extract of P. fulgens (PRE) has anti-inflammatory and anticancer properties. In this study, we aimed to investigate antiproliferative effect of PRE on U118 and T98G glioblastoma cancer cells and to reveal which molecular signaling pathways regulate this mechanism of action. The effect of PRE on cell viability of GBM cells was investigated by MTT assay. Involvement of PRE with cell growth and survival signaling pathways, phosphatidylinositol 3-kinase (PI3K)/Akt/mTOR and c-Src/signal transducer and activator of transcription 3 (STAT3), was examined using Western Blot. PRE reduced cell viability of GBM and human dermal fibroblast (HDF) cells in a dose-and time-independent manner. PI3K expression/phosphorylation level remained unchanged in both GBM and HDF cells after PRE treatment, but Akt/mTOR signaling pathway was downregulated in PRE-treated cells. PRE treatment did not affect c-Src expression/phosphorylation level in GBM cells; however, expression of c-Src was suppressed in HDF cells. Similar results were observed for STAT3 expression and phosphorylation status. PRE has the ability to suppress cell viability in GBM cells, by targeting the Akt/mTOR signaling pathway.
Green Synthesis of Silver Nanoparticles Derived from Papaver rhoeas L. Leaf Extract: Cytotoxic and Antimicrobial Properties
In the last few decades, the search for metal nanoparticles as an alternative to cancer treatments and antibiotics has increased. In this article, the spectroscopic (ultraviolet–visible (UV-vis), electron-dispersing X-ray (EDX), and Fourier transform infrared (FT-IR)), microscopic (field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), and atomic force microscope (AFM)), structural (X-ray diffractometer (XRD) and zetasizer), and analytic (thermogravimetric/differential thermal analyzer (TGA-DTA)) characterization of the silver nanoparticles (AgNPs) produced from Papaver rhoeas (PR) L. leaf extract are presented. PR-AgNPs are generally spherical and have a maximum surface plasmon resonance of 464.03 nm. The dimensions of the manufactured nanomaterial are in the range of 1.47–7.31 nm. PR-AgNPs have high thermal stability and a zeta potential of −36.1 mV. The minimum inhibitory concentration (MIC) values (mg L−1) of PR-AgNPs on Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa, and Candida albicans are 1.50, 0.75, 3.00, 6.00, and 0.37, respectively. In the study, the cytotoxic and proliferative effects of PR-AgNPs using the MTT (3-(4,5-dimethylthiazol-2-yl)-diphenyltetrazolium bromide) method on various cancer cell lines (CACO-2 (human colon adenocarcinoma cell), MCF-7 (human breast cancer cell), T98-G (glioblastoma multiforme cell), and healthy HUVEC (human umbilical vein endothelial cell)) cell lines are presented. After 24 and 48 h of the application, the half-maximum inhibitory concentration (IC50) values (μg mL−1) of PR-AgNPs on HUVEC, CACO-2, MCF-7, and T98-G lines are 2.365 and 2.380; 2.526 and 2.521; 3.274 and 3.318; 3.472 and 3.526, respectively. Comprehensive in vivo research of PR-AgNPs is proposed to reveal their potential for usage in sectors such as nanomedicine and nanochemistry.
A Case of Traumatic Myiasis in a Domestic Rabbit (Oryctolagus cuniculus) Caused By Lucilia sericata
Lucilia sericata is one of the factors resulting in facultative traumatic myiasis in animals and humans. L. sericata threatens human health and leads to significant economic losses in animal industry by leading to serious parasitic infestations. A three month old female rabbit was presented to the clinics of the Veterinary Faculty of Dicle University for the treatment of the wound located on the left carpal joint. The examination revealed that the wound was infested with larvae. The microscopic inspection of the larvae collected from the rabbit showed that they were the third instar larvae of L. sericata.
Single sural nerve response: A reliable and practical method for diagnosis of diabetic peripheral neuropathy in children with type 1 diabetes
Objectives Type 1 diabetes mellitus (T1DM) is a significant global health issue, particularly due to its association with microvascular complications such as diabetic peripheral neuropathy (DPN). Sensory nerves in the lower extremities are primarily affected by DPN, with the sural nerve being particularly impacted. The conventional method for diagnosing DPN involves evaluating four motor and four sensory nerves in the upper and lower extremities. Motor tests use dual‐point high‐intensity stimulation to elicit a compound muscle action potential, while sensory tests apply a single, lower‐intensity stimulus to assess depolarized nerve fibers. The aim of this study was to define the efficacy of using a single sural nerve response for the diagnosis of DPN in pediatric T1DM patients compared to the conventional method. Methods This retrospective study analyzed data from 242 patients, including 204 with T1DM and 38 controls. For T1DM patients, we evaluated risk factors for DPN, including age, gender, hemoglobin A1c levels, lipid parameters, and body mass index. Nerve conduction studies were evaluated in both groups. Results The examination of a single sural nerve achieved a sensitivity of 83.3% and a specificity of 97.2% in diagnosing DPN. Multivariate logistic regression analysis identified HbA1c level as the only significant predictor of DPN. Comparison of sural nerve responses between non‐neuropathic T1DM patients and the control group indicated pre‐electrophysiological nerve abnormalities within the T1DM cohort. Conclusions Evaluation of a single sural nerve response in pediatric T1DM patients can replace conventional nerve studies. The study supports the use of point‐of‐care devices for DPN detection, potentially simplifying and enhancing clinical practice. This study highlights that evaluating a single sural nerve response provides a practical and reliable method for diagnosing diabetic peripheral neuropathy in pediatric type 1 diabetes mellitus patients. With high sensitivity and specificity, this approach simplifies diagnosis, reduces the need for extensive nerve studies, and improves early detection in children.
Safety and Efficacy of Nusinersen Focusing on Renal and Hematological Parameters in Spinal Muscular Atrophy
Background Spinal muscular atrophy (SMA) is a motor neuron disease caused by mutations in the SMN1 gene. Nusinersen, an antisense oligonucleotide, has been shown to improve motor function in SMA patients. However, concerns regarding its renal safety remain as previous studies have linked similar treatments to renal toxicity. Objective The aim of this study was to evaluate the effects of the nusinersen treatment on platelet counts and renal functions, specifically urine protein excretion, in SMA patients and to estimate safe urinary protein levels before administration of each intrathecal injection. Methods This retrospective study examined data from 33 patients with SMA to assess the effects of nusinersen on motor functions and laboratory parameters including platelet count, serum creatinine, urine protein, and urine creatinine. Measurements were taken at baseline andprior to each maintenance dose, after the completion of four initial loading doses. The baseline values were compared between SMA Type 1 and Type 2 patients, while the changes in these values over time were analyzed within each group. Results No significant adverse effects on platelet counts or renal functions were observed. Urine creatinine and protein levels were significantly higher in SMA Type 2 patients compared to SMA Type 1 at baseline; these parameters remained stable in SMA Type 2 but increased significantly after the loading doses in SMA Type 1. Motor function improvements were observed in both groups, with the most significant gains in SMA Type 1 after the loading doses. Thus, improvement in motor functions was associated with increase in urine creatinine. Conclusion Nusinersen treatment did not cause significant renal toxicity or affect platelet counts. Urine creatinine levels may serve as a potential biomarker for assessing treatment response in SMA Type 1. The safety and efficacy of nusinersen treatment in 33 patients with spinal muscular atrophy (SMA) Type 1, Type 2, and Type 3 are presented. Hematological and renal parameters, including urine protein, urine creatinine, and the urine protein‐to‐creatinine ratio, were assessed before each nusinersen injection. The CHOP INTEND scores and urine creatinine levels increased in parallel after nusinersen loading, indicating a positive response to treatment in SMA Type 1. Renal parameters remained stable in Type 2 SMA patients. The urine protein‐to‐creatinine ratio was highlighted as a more reliable tool for monitoring renal toxicity, while urine creatinine was proposed as a potential biomarker for evaluating treatment response.
An 11-Year-Old Boy with Headache, Fever, and Neck Pain
An 11-year-old-boy was admitted to the pediatric emergency department with 5 days of headache that was bilateral, throbbing, and progressively worsening. Neurologic examination revealed left abducens nerve palsy.
Antioxidant properties of allium turcicum Özhatay & cowley plant extract, its effects on the proliferation and migration of cancer cells
Cancer is a type of non-communicable disease that is responsible for numerous deaths worldwide. Cancer incidence and mortality rates are on the rise due to a combination of factors, such as a growing population, aging, and poor dietary habits. The Allium turcicum Özhatay & Cowley plant is an endemic plant in the area where it grows and is consumed by the public due to its various benefits. This endemic plant, which generally grows in high-altitude regions, is sold in bunches because it is costly, mixed with rock salt, crushed into powder, and consumed as a spice. The cytotoxic and growth-inhibitory effects of A. turcicum Özhatay & Cowley herb extract on human glioblastoma U373 cells, human colorectal carcinoma cell HCT-116, and healthy HUVEC cell lines were determined by the MTT method. After 24 and 48 h of application, logIC 50 values in HUVEC, HCT-116, and U373 cells were defined as 3.737, 3.765; 3.513, 3.696, 4.476, and 4.104 μg/mL, respectively. We conducted a cell migration experiment to study the A. turcicum Özhatay & Cowley Extract (ATÖCE) impact on cancer cells’ metastatic behavior. Our findings indicate that ATÖCE has an inhibitory effect on the migration potential of the cells used in the study. We conducted experiments using DPPH, ABTS, CUPRAC, and total phenolic content to assess the antioxidant properties of ATÖCE. The findings from the antioxidant activity experiments revealed an activity level of 0.20 ± 0.046 at IC 50 . Additionally, the total phenolic content was measured to be 0.26 ± 0.044 mg GAE/g.