Papers by Yıldıray Kalkan
Journal of Environmental Pathology Toxicology and Oncology
Carbon tetrachloride (CCl4), a solvent frequently used in industry, can cause acute liver failure... more Carbon tetrachloride (CCl4), a solvent frequently used in industry, can cause acute liver failure and liver fibrosis. Infliximab (Ib), a potent tumor necrosis factor alpha blocker, has a protective effect on the liver. Therefore, we investigated the protective effect of Ib against CCl4-induced acute liver injury. In this study, 24 male Sprague Dawley rats were randomly divided into three groups: the control group (n = 8), the CCl4 group (n = 8), and the CCl4 + Ib group (n = 8). A single dose of 2 mL/kg CCL4 was administered to the CCL4 group. The CCl4 + Ib group was injected with a single dose (7 mg/kg) of Ib 24 h before CCl4 was administered. In the CCl4 group, the serum levels of aspartate aminotransferase (AST) and alanine aminotransferase (ALT), and the liver tissue levels of transforming growth factor beta 1 (TGF-β1), interleukin 1 beta (IL-1β), and adenosine deaminase (ADA) were significantly higher than the levels of these same substances in the control and CCl4 + Ib groups. ...
Japanese Journal of Anesthesiology, 2013
BioMed Research International, 2014
The aim of this study was to investigate the possible protective effects of adalimumab (ADA) on c... more The aim of this study was to investigate the possible protective effects of adalimumab (ADA) on cell damage in rat liver tissue during ischemia/reperfusion (I/R) injury of infrarenal abdominal aorta. Thirty male Wistar-albino rats were divided into three groups: control, I/R, and I/R+ADA, each group containing 10 animals. Laparotomy without I/R injury was performed in the control group animals. Laparotomy in the I/R group was followed by two hours of infrarenal abdominal aortic cross ligation and then two hours of reperfusion. ADA (50 mg/kg) was administered intraperitoneally as a single dose, to the I/R+ADA group, five days before I/R. The tumor necrosis factor-alpha (TNF-) (pg/mg protein) and nitric oxide (NO) ( mol/g protein) levels in the I/R group (430.8 ± 70.1, 8.0 ± 1.1, resp.) were significantly higher than those in the I/R+ADA group (338.0 ± 71.6, = 0.006; 6.3 ± 1.2, = 0.008) and the control group (345.5 ± 53.3, = 0.008; 6.5 ± 1.5, = 0.010, resp.). I/R causes severe histopathological injury to the liver tissue, but ADA leads to much less histopathological changes. ADA treatment significantly decreased the severity of liver I/R injury. ADA pretreatment may have protective effects on experimental liver injury.
Journal of Environmental Pathology, Toxicology and Oncology, 2015
Zoledronic acid (ZA), a bisphosphonate, increases the levels of cytokines, such as interleukin-6 ... more Zoledronic acid (ZA), a bisphosphonate, increases the levels of cytokines, such as interleukin-6 (IL-6) and tumor necrosis factor alpha (TNF-α), and reactive oxygen species (ROS) in subjects without cancer. Increased production of ROS, TNF-α, and IL-6 during ischemia and reperfusion (I/R) injury stimulates apoptosis that leads to renal injury. We aimed to investigate whether ZA treatment has a protective effect on renal tissues during I/R. Twenty-four Sprague-Dawley rats were used in this study, and they were subdivided randomly into three groups, each containing eight rats. Infrarenal abdominal aortic cross ligation was performed on the I/R group. After 2 h of ischemia, 2 h of reperfusion was applied. A single dose of 100 µg/kg ZA was administered intraperitoneally to the ZA group. I/R was performed after 48 h. Whereas TNF-α, IL-6, and nitric oxide (NO) levels of the I/R group were higher than those of the control group, TNF-α, IL-6, and NO levels of the ZA group were higher than those of the I/R group [TNF-α (p=0.038), IL-6 (p=0.012), NO (p=0.002), and caspase-3 (p=0.037)] and the control group [TNF-α (p<0.001), IL-6 (p<0.001), NO (p<0.001), and caspase-3 (p<0.001)]. Whereas the carbonic anhydrase II (CA-II) level of the ZA group was lower than that of the control group (p=0.040), the CA-II level of the I/R group was higher than that of the control group (p=0.020). ZA may aggravate renal injury during I/R by increasing cytokine production and apoptosis. It may also increase renal injury and metabolic acidosis during I/R by suppressing CA-II enzyme activities.
Archivos españoles de urología
Electromagnetic radiation (ER) emitted from cell phones may exert a detrimental influence on huma... more Electromagnetic radiation (ER) emitted from cell phones may exert a detrimental influence on human health and may affect the man reproductive system. We aimed to study the biological and morphological effects on the testes of 60-day-old male rats after ER exposure (900 MHz), which was applied continuously throughout embryogenesis. A total of six pregnant Sprague Dawley rats were included in the study. Three pregnant rats (experimental group) were exposed to radiation from a cell phone set to talking mode for 24 hours a day for 20 days, and the other 3 pregnant rats (control group) were not to exposed to radiation. Newborn male rats were included from the experimental group (n=7) and the control group (n=7). At the end of 60 days, the rats' testes were excised, and testis length, width, depth, and weight were measured. Histopathological examinations were compared and serum testosterone (T) levels were assayed biochemically. While serum T level (3.51±0.21 ng/ml) of ER Exposed grou...
Journal of cancer research and therapeutics
Although methotrexate (mtx) is a widely used agent to treat cancer and inflammatory diseases, its... more Although methotrexate (mtx) is a widely used agent to treat cancer and inflammatory diseases, its hepatotoxic effect limits for clinical utility. We aimed to investigate whether infliximab (inf), an inhibitor of tumor necrosis factor-alpha (TNF-α) has a protective effect against mtx-induced hepatotoxicity. For mtx group, the animals received an intraperitoneal single dose injection of mtx at a dose of 20 mg/kg. For inf group, the animals received an intraperitoneal single dose injection of inf at a dose of 7 mg/kg. For mtx + inf group, the single dose of inf at a dose of 7 mg/kg was given 72 h prior to mtx injection. After 72 h, a single dose of mtx 20 mg/kg was given. All rats were sacrificed 5 days after mtx injection. TNF-α and nitric oxide (NO) levels of mtx group was significantly higher than the control (P < 0.001), inf (P < 0.001) and mtx + inf (P < 0.001) groups. Total score of histological damage was higher in the mtx group when compared with the mtx + inf group. A...
Journal of Molecular Histology, 2012
Reversal of neuromuscular blockage induced by steroidal neuromuscular blocking agents such as roc... more Reversal of neuromuscular blockage induced by steroidal neuromuscular blocking agents such as rocuronium can be achieved using normal dose of sugammadex, which has been shown to be very effective for such reversal. In this study, we determined the effects of sugammadex on calcineurin immunoreactivity by examining the histopathological and histochemical structure of rat testis cells after neuromuscular blockage. Moreover, the regional distribution levels of calcineurin immunopositive testes cells were investigated. Eighteen adult male, Sprague-Dawley rats were divided into one control and two study groups. Study groups 1 and 2 rats received sugammadex at doses of 16 and 96 mg kg(-1) i.v., respectively, after rocuronium treatment (mg kg(-1) i.v.). The control group received intravenous 0.9% NaCl 1 ml. i.v without any drug. Our study demonstrates that sugammadex is safe and effective for reversal of rocuronium effects in rats, as well as in other animals and humans. Furthermore, histopathological examination indicates that high levels of sugammadex-rocuronium complexes accumulate a little in testis tissue. We found that rocuronium-sugammadex complexes were remained in circulation for a long time resulting in a decrease in interstitial space, testis size, germ cell numbers and Leydig cell numbers. Calcineurin immunoreactivity was higher in the experimental groups than the control group due to increase of calcium level. The results suggest that sugammadex-rocuronium complexes are cause histopathological and immunohistochemical changes in testis interstitial tissues, as well as changes in sperm density and germ cell number.
Neural Regeneration Research, 2015
Daidzein, a plant extract, has antioxidant activity. It is hypothesized, in this study, that daid... more Daidzein, a plant extract, has antioxidant activity. It is hypothesized, in this study, that daidzein exhibits neuroprotective effects on cerebral ischemia. Rat models of middle cerebral artery occlusion were intraperitoneally administered daidzein. Biochemical and immunohistochemical tests showed that superoxide dismutase and nuclear respiratory factor 1 expression levels in the brain tissue decreased after ischemia and they increased obviously after daidzein administration; malondialdehyde level and apoptosis-related cysteine peptidase caspase-3 and caspase-9 immunoreactivity in the brain tissue increased after ischemia and they decreased obviously after daidzein administration. Hematoxylin-eosin staining and luxol fast blue staining results showed that intraperitoneal administration of daidzein markedly alleviated neuronal damage in the ischemic brain tissue. These findings suggest that daidzein exhibits neuroprotective effects on ischemic brain tissue by decreasing oxygen free radical production, which validates the aforementioned hypothesis.
Acta oto-laryngologica, Jan 2, 2015
The results support that chronic electromagnetic field exposure may cause damage by leading to ne... more The results support that chronic electromagnetic field exposure may cause damage by leading to neuronal degeneration of the auditory system. Numerous researches have been done about the risks of exposure to the electromagnetic fields that occur during the use of these devices, especially the effects on hearing. The aim of this study is to evaluate the effects of the electromagnetic waves emitted by the mobile phones through the electrophysiological and histological methods. Twelve adult Wistar albino rats were included in the study. The rats were divided into two groups of six rats. The study group was exposed to the electromagnetic waves over a period of 30 days. The control group was not given any exposure to the electromagnetic fields. After the completion of the electromagnetic wave application, the auditory brainstem responses of both groups were recorded under anesthesia. The degeneration of cochlear nuclei was graded by two different histologists, both of whom were blinded to...
Clinical Oral Investigations, 2015
Objectives The aim of this study was to compare the neurotoxicity of various root canal sealers o... more Objectives The aim of this study was to compare the neurotoxicity of various root canal sealers on rat sciatic nerve by electrophysiologic and histopathologic analyses. Materials and methods A total of 40 male rats were randomly divided into five groups: Control, AH Plus, GuttaFlow, Sealapex and Smartpastebio. Sciatic nerves of the rats were uncovered using the surgical procedures, and the prepared sealers were then applied on nerves with a polyethylene tube vehicle for 15 days. Nerve potentials were recorded at initial exposure, 5, 30 and 120 min (early phase), and 15 days (late phase) by an electrophysiologic analysis system for all groups. The obtained measurements were then used to calculate the nerve conduction velocities (NCV). Subsequently, all rats were sacrificed, and their sciatic nerves were removed for histopathologic analysis. Statistical analysis was performed using the Kruskal-Wallis and Mann-Whitney U tests for intergroup variables and the Friedman and Wilcoxon test for intragroup variables. Statistical significance was set at P<0.05.
Folia Histochemica et Cytobiologica, 2014
The Pringle maneuver is used in hepatic surgery to prevent blood loss but is associated with isch... more The Pringle maneuver is used in hepatic surgery to prevent blood loss but is associated with ischemia- reperfusion injury. To investigate the effect of infliximab on inflammation and apoptosis in rat intestinal mucosa during ischemia-reperfusion (IR) injury. A total of 30 male Wistar albino rats were equally divided into three groups to be subjected to (i) sham operation (sham), (ii) IR injury via Pringle maneuver (pringle) or (iii) infliximab (IFX) group (IFX was given at a dose 3 mg/kg for 3 days before IR injury). Following reperfusion period of 60 min., intestinal tissue and blood samples were taken and processed by standard histological methods. The Pringle maneuver and following reperfusion caused significant histopathological changes, increased serum transaminases&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; activity and the levels of oxidative stress markers and decreased glutathione peroxidase activity. IFX pretreatment partially prevented these changes. Infliximab pretreatment may protect intestinal mucosa against ischemia-reperfusion injury. Further studies are needed to investigate mechanism and evaluate safety and optimal dosing of IFX in humans exposed to the possible tissue damage by ischemia-reperfusion.
Turkiye Klinikleri Journal of Medical Sciences, 2013
TURKISH JOURNAL OF MEDICAL SCIENCES, 2015
Brain ischemia and treatment are important topics in neurological science. Free oxygen radicals a... more Brain ischemia and treatment are important topics in neurological science. Free oxygen radicals and inflammation formed after ischemia are accepted as the most significant causes of damage. Currently there are studies on many chemopreventive agents to prevent cerebral ischemia damage. Our aim is to research the preventive effect of the active ingredient in syringic acid, previously unstudied, on oxidative damage in cerebral ischemia. The rats were randomly divided into 4 groups: control group (no medication or surgical procedure), sham group (artery occlusion), artery occlusion + syringic acid group sacrificed at 6 h, and artery occlusion + syringic acid group sacrificed at 24 h. Obtained brain tissue from the right hemisphere was investigated histopathologically and for tissue biochemistry. Superoxide dismutase and nuclear respiratory factor 1 values decreased after ischemia and they increased after syringic acid treatment, while increased malondialdehyde levels after ischemia were reduced after treatment. Caspase-3 and caspase-9 values increased after ischemia and decreased after treatment; this reduction was more pronounced at 24 h. Our study revealed that syringic acid treatment in cerebral ischemia reduced oxidative stress and neuronal degeneration. In the light of the biochemical and histopathologic results of the present study, we think that syringic acid treatment may be an alternative treatment method.
Neural Regeneration Research, 2015
Daidzein, a plant extract, has antioxidant activity. It is hypothesized, in this study, that daid... more Daidzein, a plant extract, has antioxidant activity. It is hypothesized, in this study, that daidzein exhibits neuroprotective effects on cerebral ischemia. Rat models of middle cerebral artery occlusion were intraperitoneally administered daidzein. Biochemical and immunohistochemical tests showed that superoxide dismutase and nuclear respiratory factor 1 expression levels in the brain tissue decreased after ischemia and they increased obviously after daidzein administration; malondialdehyde level and apoptosis-related cysteine peptidase caspase-3 and caspase-9 immunoreactivity in the brain tissue increased after ischemia and they decreased obviously after daidzein administration. Hematoxylin-eosin staining and luxol fast blue staining results showed that intraperitoneal administration of daidzein markedly alleviated neuronal damage in the ischemic brain tissue. These findings suggest that daidzein exhibits neuroprotective effects on ischemic brain tissue by decreasing oxygen free radical production, which validates the aforementioned hypothesis.
Toxicology and Industrial Health, 2013
Mast cells play a vital role in hypersensitivity reactions. Rocuronium is known to cause mast cel... more Mast cells play a vital role in hypersensitivity reactions. Rocuronium is known to cause mast cell mobilization, hypersensitivity, and pancreatitis. The aim of this study was to investigate the effects of sugammadex on pancreatic changes due to rocuronium. A total of 42 Sprague-Dawley male rats were divided into six equal groups to receive either rocuronium 1 mg/kg intravenously (i.v., R group), rocuronium 1 mg/kg + sugammadex 16 mg/kg i.v. (RS16 group), rocuronium 1 mg/kg + sugammadex 96 mg/kg i.v. (RS96 group), sugammadex 16 mg/kg (S16), sugammadex 96 mg/kg i.v. (S96 group), or 0.9% sodium chloride (control group). Sugammadex was administered 5s later following rocuronium. In R group, mast count was higher, and the distribution rate of granules and nuclear changes were different compared with other groups. Distribution rate of granules in groups S16 and S96 were similar to the control group and lower compared with other groups. The amount of mast cells and granule density in groups RS16 and RS96 was lower compared with R group. The amount of mast cells in groups RS16 and RS96 was significantly lower compared with other treatment groups. These results suggest that sugammadex may have an inhibitory effect on mobilization and morphological changes in pancreatic mast cells induced by administration of rocuronium and sugammadex in rats.
European Journal of Obstetrics & Gynecology and Reproductive Biology, 2015
Resveratrol, a phytoalexin polyphenol, has anti-angiogenic, antioxidant, anti-inflammatory proper... more Resveratrol, a phytoalexin polyphenol, has anti-angiogenic, antioxidant, anti-inflammatory properties. We aimed to compare the anti-inflammatory and anti-angiogenic effects of resveratrol and leuprolide acetate (LA) in an experimental endometriosis model. A prospective experimental study was conducted in a University Surgical Research Center. Thirty-three non-pregnant female Sprague-Dawley rats, in which experimental model of endometriosis were surgically induced were randomly divided into four groups. Group 1 was administered 30 mg/kg resveratrol i.m. for 14 days, group 2 was given 1mg/kg s.c. single dose LA, group 3 was administered both resveratrol and LA, and group 4 had no medication. After two weeks medication rats were sacrificed and size, histopathology and immunreactivity to matrix metalloproteinase (mmp)2, mmp9, vascular endothelial growth factor (VEGF) of the endometriotic implants were evaluated. Plasma and peritoneal fluid levels of interleukin (IL)-6, IL-8, and tumor necrosis factor-α (TNF-α) were analyzed. The endometriotic implant volumes, histopathological grade and immunreactivity to mmp2, mmp9 and VEGF were significantly reduced (p&amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001), and plasma and peritoneal fluid levels of IL-6, IL-8 and TNF-α were significantly decreased in group 1 and group 2 in comparison to group 3 and group 4 (p &amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.001). Resveratrol alone is a potential agent for the treatment of endometriosis and may be an alternative to LA. In contrast, the combination of LA and resveratrol decreased the anti-inflammatory and anti-angiogenic effects of each agent. Since resveratrol is widely used as an alternative therapy for a variety of conditions, it can undermine the effectiveness of LA. Therefore, caution should be exercised when used in combination with other agents.
Photomedicine and Laser Surgery, 2010
Objective: Neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers have been used for a wide rang... more Objective: Neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers have been used for a wide range of dental applications. However, the safety of their clinical applications is still in question.
Journal of Molecular Histology, 2012
Reversal of neuromuscular blockage induced by steroidal neuromuscular blocking agents such as roc... more Reversal of neuromuscular blockage induced by steroidal neuromuscular blocking agents such as rocuronium can be achieved using normal dose of sugammadex, which has been shown to be very effective for such reversal. In this study, we determined the effects of sugammadex on calcineurin immunoreactivity by examining the histopathological and histochemical structure of rat testis cells after neuromuscular blockage. Moreover, the regional distribution levels of calcineurin immunopositive testes cells were investigated. Eighteen adult male, Sprague-Dawley rats were divided into one control and two study groups. Study groups 1 and 2 rats received sugammadex at doses of 16 and 96 mg kg -1 i.v., respectively, after rocuronium treatment (mg kg -1 i.v.). The control group received intravenous 0.9% NaCl 1 ml. i.v without any drug. Our study demonstrates that sugammadex is safe and effective for reversal of rocuronium effects in rats, as well as in other animals and humans. Furthermore, histopathological examination indicates that high levels of sugammadex-rocuronium complexes accumulate a little in testis tissue. We found that rocuronium-sugammadex complexes were remained in circulation for a long time resulting in a decrease in interstitial space, testis size, germ cell numbers and Leydig cell numbers. Calcineurin immunoreactivity was higher in the experimental groups than the control group due to increase of calcium level. The results suggest that sugammadex-rocuronium complexes are cause histopathological and immunohistochemical changes in testis interstitial tissues, as well as changes in sperm density and germ cell number.
Domestic Animal Endocrinology, 2012
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Papers by Yıldıray Kalkan