Protective effect of adenosine triphosphate and benidipine separately or together against cardiotoxicity caused by bevacizumab.

Bevacizumab is a recombinant humanized monoclonal antibody whose adverse effects include cardiotoxicity. We investigated whether using adenosine triphosphate (ATP) or benidipine either separately or together protects against cardiac damage induced by bevacizumab in rats. Forty Wistar albino male rats were allocated to five groups of eight: bevacizumab (Bv), ATP + bevacizumab (ABv), benidipine + bevacizumab (BBv), ATP + benidipine + bevacizumab (ABBv) and untreated controls. Rats in the ABv group were injected intraperitoneally (i.p.) with 2 mg/kg ATP. The BBv group was given 4 mg/kg benidipine by oral gavage. The ABBv group was injected i.p. with 2 mg/kg ATP and simultaneously administered 4 mg/kg benidipine orally. One hour after administration of ATP, benidipine or normal saline, the Bv, ABv, BBv and ABBv groups were injected i.p. with 10 mg/kg bevacizumab. Malondialdehyde (MDA) and total glutathione (tGSH) levels were measured in cardiac tissue, and troponin I (TP I) and creatine kinase MB (CK-MB) levels were measured in blood samples. Tissue samples were examined for histopathology. We found the lowest TP I, CK-MB and MDA levels and the highest tGSH level in the ABBv group; these results were similar to the control group. Nuclei of cardiomyocytes in the BV group were misshapen and shrunken, and myofibers were disrupted; we also observed eosinophilic degeneration and interstitial edema. Blood capillaries were dilated and congested. We observed amelioration of these findings in the ABBv group. We found that ATP and benidipine alone or in combination reduced cardiac damage associated with the use of bevacizumab. ATP + benidipine combined therapy produced the most favorable results.

The protective effect of carvacrol on bevacizumab-related skin injury in rats: a biochemical and histopathological evaluation.

PURPOSE: Bevacizumab is a recombinant humanized monoclonal antibody that specifically binds to vascular endothelial growth factor (VEGF). Cutaneous side effects of bevacizumab are seen with substantial frequency and may require the interruption of the treatment. The aim of the study was to conduct a biochemical and histopathological investigation of the effects of carvacrol against the possible oxidative skin damage caused by bevacizumab in rats. MATERIALS AND METHODS: A total of 18 adult male Wistar albino rats were randomly assigned to three groups as healthy (H group; n = 6), bevacizumab alone (B group; n = 6), and carvacrol + bevacizumab (CB group; n = 6). Carvacrol was injected intraperitoneally (IP) at a dose of 50 mg/kg in the CB group. Sterile salt solution (0.9% NaCl) was used as a solvent for the H and B groups. One hour after the administration of carvacrol and solvent, bevacizumab at a dose of 10 mg/kg IP was administered to the CB and B groups. Bevacizumab was given once daily for a total of two doses, 15 days apart. Carvacrol was administered once daily for one month. After that period, all animals were sacrificed and their skin tissues removed. Malondialdehyde (MDA), glutathione (GSH), glutathione peroxidase (GPO), catalase (CAT), superoxide dismutase (SOD), total oxidant status (TOS), and total antioxidant status (TAS) levels in rats' skin tissues were biochemically evaluated. The parameters were measured with spectrophotometric method by using a microplate reader (BioTek, Winooski, VT, USA). The skin tissues were also examined histopathologically by the pathologist (blind) for the study groups. RESULTS: The MDA and TOS levels of the H and CB groups were significantly lower than the B group (p < 0.05). The mean scores of the other biochemical levels (GSH, GPO, CAT, SOD, TAS) in the H group were significantly higher than in the B and CB groups. Pathological examination of H group was normal. In B group epidermal atrophy, abnormal keratin accumulation, degenerated hair follicles, edoema and inflammatory cells accumulation in the dermis were observed. In the CB group, these findings were significantly improved. CONCLUSION: The positive effect of carvacrol against possible local oxidative skin damage due to bevacizumab in rats was demonstrated. In addition, more detailed studies are required to clarify the mechanism of the protective effect of carvacrol against bevacizumab-induced skin toxicity. The effect should be evaluated through further human studies, as well as studies using different doses of carvacrol.

The effect of rutin on experimentally induced acute heart contusion in rats: Biochemical and histopathological evaluation.

BACKGROUND: Acute cardiac contusion induced by trauma is known with its high mortality and morbidity. The role of oxidative stress and inflammation in its pathophysiology has led to the investigation of antioxidant and anti-inflammatory substances in non-sur-gical treatment. In this study, the effects of rutin which has these two features on acute cardiac contusion were investigated. METHODS: Thirty male albino Wistar rats were divided into three equal groups as healthy (HG), contusion (CG), and rutin + con-tusion (rutin + CG). A heart contusion was created dropping 200 g weight from 1-m height onto anterior thorax of CG (n=10) and Rutin + CG (n=10) group animals by anesthetizing with intraperitoneal administration of 60 mg/kg ketamine and xylazine inhalation at appropriate intervals. Thirty minutes after contusion was applied, rutin at the dose of 50 mg/kg was administered orally to the stomach by gavage to the rutin + CG group animals. The rutin was used once a day for 2 days. Rats were killed at the end of 48 h. Heart tissues were removed and examined biochemically and histopathologically. Troponin I (TP I) and creatine kinase-MB (CK-MB) were measured in blood samples taken from the tail veins just before the rats were killed. RESULTS: TP I, CK-MB, malondialdehyde, total oxidant status, and nuclear factor-kappa B levels increased in the CG when compared to the HG, and Rutin application prevented this increase, total glutathione (eGSH) and total antioxidant status levels decreased, and rutin application prevented this decrease. Histopathological findings also supported these findings. CONCLUSION: Rutin had a protective effect on heart tissue.

The effects of taxifolin on neuropathy related with hyperglycemia and neuropathic pain in rats: A biochemical and histopathological evaluation.

BACKGROUND: Hyperglycemia can be considered a determining factor in the development of diabetic neuropathy as well as neuropathic pain. There is a relationship between the excessive production of reactive oxygen species (ROS) and the pathogenesis of diabetic neuropathic pain. Taxifolin, on the other hand, is a flavonoid that has been documented to inhibit ROS production. OBJECTIVES: To investigate the effects of taxifolin, which has antioxidant and neuroprotective effects, on alloxan-induced hyperglycemia-induced neuropathy and neuropathic pain, biochemically and histopathologically. MATERIAL AND METHODS: The albino Wistar male rats were divided into 3 groups: healthy group (HG), only alloxan group (AXG) and alloxan+taxifolin group (ATG). Hyperglycemia in animals was caused through intraperitoneal injection of alloxan at a dose of 120 mg/kg. Paw pain thresholds of animals were measured using Basile algesimeter. Sciatic nerve tissues were examined biochemically and histopathologically in order to evaluate neuropathy. RESULTS: Our experimental results revealed that taxifolin significantly prevented the increase of plasma glucose concentration level with alloxan administration, the decrease of the paw pain threshold related to hyperglycemia, the change of oxidant-antioxidant balance in the sciatic nerve tissue in favor of oxidants, and the deterioration of tissue morphology in animals. CONCLUSIONS: Our experimental results indicate that taxifolin alleviates alloxan-induced hyperglycemia-related neuropathy and neuropathic pain.

Protective effect of taxifolin against prooxidant and proinflammatory kidney damage associated with acrylamide in rats.

The current study investigates the biochemical and histopathological effects of taxifolin on acrylamide-induced kidney damage. A 50 mg/kg dose of taxifolin was administered via oral gavage to the taxifolin + acrylamide (TACR) group (n-6) consisting of male albino Wistar rats. The same volume of distilled water used as solvent was orally administered to the acrylamide (ACR) (n-6) and healthy (HG) (n-6) groups. One hour after the administration of taxifolin and distilled water, a 20 mg/kg dose of acrylamide was orally administered to the TACR and ACR groups. This procedure was repeated once a day for 30 days. In the acrylamide group, malondialdehyde (MDA), tumour necrosis factor-alpha (TNF-α), and interleukin-1 beta (IL-1ß) levels were found to be high, total glutathione (tGSH) levels were found to be low, and there was severe interstitial haemorrhage; additionally, tubular necrosis, tubular atrophy, leucocyte infiltration, and glomerular structures with expanded Bowman's space were observed. In the taxifolin group, where the increase of MDA, IL-1ß, and TNF-α and the decrease of tGSH associated with acrylamide have been prevented, any histopathological finding other than mild necrosis and atrophic tubules was not found. This suggests that Taxifolin would prevent kidney tissue from acrylamide-induced damage would be effective in treating acrylamide-induced nephrotoxicity, inhibiting the increase of MDA, IL-1ß and TNF-α, and decreasing tGSH associated with acrylamide.

Protective effects of taxifolin on pazopanib-induced liver toxicity: an experimental rat model.

Pazopanib is a tyrosine kinase inhibitor that is generally used for the treatment of metastatic renal cell cancer and advanced soft tissue sarcoma. It can cause various degrees of hepatotoxicity. Our study aimed to investigate the effect of taxifolin on pazopanib-induced liver toxicity. A total of 18 rats were divided into three groups: the pazopanib (PP), pazopanib plus taxifolin (TPP), and control (C) group. Taxifolin was administered to the TPP (n=6) group with a dose of 50 mg/kg. Distilled water was orally admnistered to the C (n=6) and PP (n=6) groups as a solvent. Subsequently, pazopanib 200 mg/kg was administered to the TPP and PP groups via the stomach. This procedure was repeated once a day for four weeks. Then, all rats were sacrificed, and their livers were removed. Malondialdehyde (MDA), total glutathione (tGSH), total oxidant status (TOS), and total antioxidant status (TAS) levels were evaluated. MDA and TOS levels were higher in the PP group compared with the levels of the other parameters (P<0.001). tGSH and TAS levels were lower in the PP group than in the TPP and C groups (P<0.001), and the aspartate aminotransferase (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH) levels were higher. Furthermore, liver tissue damage, including hemorrhage, hydropic degeneration, and necrosis was observed in the PP group. Administration of taxifolin before pazopanib significantly improved degenerative changes. Our study demonstrated that the administration of taxifolin is significantly effective in preventing pazopanib-induced hepatotoxicity in rats.

Effects of adenosine triphosphate on vandetanib induced skin damage in rats.

PURPOSE: Vandetanib is a wide spectrum tyrosine kinase inhibitor used for the treatment of metastatic medullary thyroid cancer (MTC) and various other cancer types. Although it is usually well-tolerated it has been linked to a variety of severe dermatologic reactions. Our study aimed was to investigate adenosine 5'-triphosphate (ATP) on vandetanib-induced skin damage. MATERIALS AND METHODS: A total number of 18 rats were divided into three equal groups as vandetanib group (VDB), vandetanib plus ATP group (VAT), and healthy group (HG); 25 mg/kg ATP was injected intraperitoneally (ip) to the VAT group. Normal saline was given to the HG and VDB groups as solvent via intraperitoneally. One hour later, 25 mg/kg vandetanib was applied orally via an orogastric catheter in the VAT and VDB groups. This procedure was repeated once daily for 4 weeks. After that period, all animals were sacrificed and their skin tissues removed. Malondialdehyde (MDA), total glutathione (tGSH), total oxidant status (TOS), total antioxidant status (TAS) levels in rats' skin tissues were evaluated with histopathological analyses. RESULTS: MDA and TOS levels measured higher in the VDB group compared to the VAT and HG groups (p < 0.001). tGSH and TAS levels of the VDB group measured lower than the VAT and HG groups (p < 0.001). The structure and morphology of skin tissue were normal in the control group. In the VDB group, skin tissue damage with thinner epitelium, ruptured and degenerated hair follicles, abnormal accumulation of abnormal keratin on the epithelium and oedematous areas in the dermis was observed. In the VAT group, these findings were significantly improved. CONCLUSION: We demonstrated that adenosine triphosphate can prevent vandetanib-induced skin toxicity in rats for the first time. The promising results denote that further studies testing this agent in other animal models and in humans are warranted.

The effect of desflurane and propofol protocols on preconditioning.

BACKGROUND: Preconditioning is one of the most powerful mechanisms preventing the myocardial ischemic damage that occurs during coronary artery bypass grafting. OBJECTIVES: We aimed to investigate the effects of different propofol and/or desflurane administration protocols in terms of the prevention of ischaemia-reperfusion damage. MATERIAL AND METHODS: Ninety patients, aged > 18 years, American Society of Anesthesiologists (ASA) category III, scheduled to undergo primary elective coronary artery bypass grafting (CABG), were included in the study. During maintenance, the patients in group 1 (n = 30) received a propofol infusion (5-6 mg/kg/h) combined with a fentanyl infusion (3-5 mcg/kg/h); the patients in group 2 (n = 30) also received a propofol infusion (5-6 mg/kg/h) combined with a fentanyl infusion (3-5 mcg/kg/h), but they were also given 6% desflurane inhalation for 15 min both before cross-clamping of the aorta and after removal of the clamp; the patients in group 3 (n = 30) received a propofol infusion (2-3 mg/kg/h) combined with a fentanyl infusion (3-5 mcg/kg/h) and received the continuous 6% desflurane inhalation. Blood samples were drawn in the preoperative period (S1), during cardiopulmonary bypass, before cross-clamping the aorta (S2), after removal of the cross-clamp (S3) and 24 h after the operation (S4). RESULTS: All groups were similar in terms of age and BMI (p > 0.05). TNF-α levels were higher at S3 compared to S1, S2 and S4 (p > 0.001). The TNF-α levels at S4 were lower in group 3 than those in group 1 and group 2 (p < 0.05). In all groups, h-FABP levels showed an increase in S3 but were significantly lower at S4 (p < 0.05). In group 3, h-FABP levels at S2 and S3 were significantly lower than those in group 1 (p < 0.05). There was a moderate correlation between h-FABP and TNF-α levels (Spearman's rho = 0.472, p < 0.001). CONCLUSIONS: On the basis of the measurement of h-FABP and TNF-α, low-dose propofol and continuous desflurane inhalation provide more effective preconditioning than propofol alone or a short course of desflurane in patients undergoing CABG.

Effect of thiamine pyrophosphate on retinopathy induced by hyperglycemia in rats: A biochemical and pathological evaluation.

PURPOSE: Information is lacking on the protective effects of thiamine pyrophosphate (TPP) against hyperglycemia-induced retinopathy in rats. This study investigated the biochemical and histopathological aspects of the effect of TPP on hyperglycemia-induced retinopathy induced by alloxan in rats. MATERIALS AND METHODS: The rats were separated into a diabetic TPP-administered group (DTPG), a diabetes control group (DCG) and a healthy group (HG). While the DTPG was given TPP, the DCG and HG were administered distilled water as a solvent at the same concentrations. This procedure was repeated daily for 3 months. At the end of this period, all of the rats were euthanized under thiopental sodium anesthesia, and biochemical and histopathological analyses of the ocular retinal tissues were performed. The results of the DTPG were compared with those of the DCG and HG. RESULTS: TPP prevented hyperglycemia by increasing the amount of malondialdehyde and decreasing endogen antioxidants, including total glutathione, glutathione reductase, glutathione S-transferase and superoxide dismutase. In addition, the amounts of the DNA oxidation product 8-hydroxyguanine were significantly lower in the retinas of the DTPG compared to the DCG. In the retinas of the DCG, there was a marked increase in vascular structures and congestion, in addition to edema. In contrast, little vascularization and edema were observed in the DTPG, and there was no congestion. The results suggest that TPP significantly reduced the degree of hyperglycemia-induced retinopathy. CONCLUSIONS: The results of this study indicate that TPP may be useful for prophylaxis against diabetic retinopathy.

Comparison of TIVA and Desflurane Added to a Subanaesthetic Dose of Propofol in Patients Undergoing Coronary Artery Bypass Surgery: Evaluation of Haemodynamic and Stress Hormone Changes.

Introduction. Increased levels of stress hormones are associated with mortality in patients undergoing coronary artery bypass grafting (CABG). Aim. To compare total intravenous anaesthesia (TIVA) and desflurane added to a subanaesthetic dose of propofol. Material and Methods. Fifty patients were enrolled in this study. Fentanyl (3-5 mcg/kg/h) was started in both groups. Patients were divided into two groups. The PD group (n = 25) received 1 minimum alveolar concentration (MAC) desflurane anaesthesia in addition to propofol infusion (2-3 mg/kg/h), while P group (n = 25) received propofol infusion (5-6 mg/kg/h) only. Biochemical data, cortisol, and insulin levels were measured preoperatively (T0), after initiation of CPB but before cross-clamping the aorta (T1), after removal of the cross-clamp (T2), and at the 24th postoperative hour (T3). Results. Systolic, diastolic, and mean arterial pressure levels were significantly higher in PD group than those in P group in T1 and T2 measurements (p ≤ 0.05). CK-MB showed a significant decrease in group P (p ≤ 0.05). When we compared both groups, cortisol levels were significantly higher in PD group than P group (p ≤ 0.05). Conclusion. Stress and haemodynamic responses were better controlled using TIVA than desflurane inhalation added to a subanaesthetic dose of propofol in patients undergoing CABG.

Effect of Kineret® on ovarian ischemia reperfusion injury in a rat model.

AIM: To investigate the effect of Kineret® on ischemia reperfusion (IR) injury in rat ovaries. METHODS: Rats were divided into four groups: ovarian IR (IRG); 50 mg/kg Kineret® + ovarian IR (KIR-50); 100 mg/kg Kineret® + ovarian IR (KIR-100); and sham operation (SOC). KIR-50 (n = 10) and KIR-100 (n = 10) groups received an intraperitoneal injection of Kineret® at doses of 50 and 100 mg/kg, respectively. IRG and SOC (n = 10) rat groups were given distilled water as solvent using the same method. The results were compared between the groups. RESULTS: In rats in which IR occurred, oxidant parameters, such as malondialdehyde (MDA) and myeloperoxidase (MPO), were increased, the level of proinflammatory interleukin 1 beta (IL-1ß) was elevated and total glutathione (tGSH) as an antioxidant was decreased in the ovarian tissues. Administration of Kineret® at a dose of 100 mg/kg inhibited the increase of MDA, MOP and IL-1ß and a decrease in tGSH caused by IR more significantly than administration of Kineret® at a dose of 50 mg/kg. In addition, 100 mg/kg Kineret® significantly decreased severe hemorrhage, degeneration and inflammatory signs in the follicular cells, caused by IR. Kineret® at 100 mg/kg markedly ameliorated increased apoptosis in ovarian tissue with IR more significantly than 50 mg/kg kineret. CONCLUSION: Our findings indicate that Kineret® might be useful in clinical practice for the treatment of damage that may occur as a result of ovarian torsion.

Impact of Rho-Kinase Inhibitor Hydroxyfasudil in Protamine Sulphate Induced Cystitis Rat Bladder.

OBJECTIVES: The objective of the present study was to evaluate anti-inflammatory effects of hydroxyfasudil in a protamine sulfate (PS) induced cystitis rat model. Additionally, we investigated prevention of bladder overactivity (BO), and tissue damage in these experiments. METHODS: Animals were divided into four groups. In Groups 1 and 2, chemical induced cystitis model was created by administrating intravesical PS with PE50 catheter by the transurethral route. In Group 1, Rho-kinase inhibitor hydroxyfasudil was administered intaperitoneally, and in Group 2, subjects were administered a corresponding volume of saline in the same way. In Group 3, vehicle was administered intravesically and hydroxyfasudil was administrated intraperitoneally. Group 4 was a control Group, and the vehicle was administered intravesically and intraperitoneally. Micturition frequencies were recorded. Biochemical analyses were performed for oxidative stress, and pathological evaluations were investigated. In vitro contractions of bladder tissue strips were measured in tissue-bath. RESULTS: There were significantly lower Lipid peroxidase levels and higher levels of Glutathione in Group 1 than Group 2 (P = 0.016, P = 0.001, respectively). There was generally more inflammation in Group 2 than the other groups as determined by microscopy. There were significantly higher frequencies of micturition, lower volume, and mean voided maximum urine output after PS administration in Groups 1 and 2. In vitro contraction responses of bladder strips to potassium chloride and acetylcholine were statistically higher in Group 2 than Groups 1 and 3. CONCLUSIONS: Significant reduction of inflammation by affecting the anti-oxidant defense systems was provided by hydroxyfasudil. Decreased in vitro responses to contractions of bladder smooth muscle strips were obtained. Hydroxyfasudil may be a potential new therapeutic option for inflammation and BO, in rat bladder.

In vitro effects of some drugs on catalase purified from human skin.

Catalase enzyme (H202: oxidoreductase; E.C. 1.11.1.6) was purified from human skin homogenate using ammonium sulfate precipitation and DEAE-Sephadex A50 ion exchange chromatography at 4 degrees C and some characteristics of the enzyme were investigated. The human skin enzyme, having a specific activity of 1354.5 EU/mg proteins was purified with a yield of 43.13% and 1110-fold. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) showed a single band for the enzyme. Inhibition by piroxicam, ketoprofen, diclofenac sodium, sulfamethoxazole and nidazole occurred with I50 values of 0.414, 1.29, 1.8, 3.83, and 8.64 mM, respectively.

Effects of nicotine and vitamin E on glucose 6-phosphate dehydrogenase activity in some rat tissues in vivo and in vitro.

Effects of nicotine, and nicotine + vitamin E on glucose 6-phosphate dehydrogenase (G-6PD) activity in rat muscle, heart, lungs, testicle, kidney, stomach, brain and liver were investigated in vivo and in vitro on partially purified homogenates. Supplementation period was 3 weeks (n = 8 rats per group): nicotine [0.5 mg/kg/day, intraperitoneal (ip)]; nicotine + vitamin E [75 mg/kg/day, intragastric (ig)]; and control group (receiving only vehicle). The results showed that nicotine (0.5 mg/kg, ip) inhibited G-6PD activity in the lungs, testicle, kidney, stomach and brain by 12.5% (p < 0.001), 48% (p < 0.001), 20.8% (p < 0.001), 13% (p < 0.001) and 23.35% (p < 0.001) respectively, and nicotine had no effects on the muscle, heart and liver G6PD activity. Also, nicotine + vitamin E inhibited G-6PD activity in the testicle, brain, and liver by 32.5% (p < 0.001), 21.5% (p < 0.001), and 16.5% (p < 0.001) respectively, and nicotine + vitamin E activated the muscle, and stomach G-6PD activity by 36% (p < 0.05), and 20% (p < 0.001) respectively. In addition, nicotine + vitamin E did not have any effects on the heart, lungs, and kidney G-6PD activity. In addition, in vitro studies were also carried out to elucidate the effects of nicotine and vitamin E on G-6PD activity, which correlated well with in vivo experimental results in lungs, testicles, kidney, stomach, brain and liver tissues. These results show that vitamin E administration generally restores the inactivation of G-6PD activity due to nicotine administration in various rat tissues in vivo, and also in vitro.