Search

Amaç: Gebelik sırasında sigara ve alkol tüketimi doğum eylemi üzerinde istenmeyen etkilere neden olmaktadır. Altta yatan mekanizmalar hala tam olarak anlaşılmamış olmakla birlikte, bozulmuş miyometriyum fonksiyonel yanıtları bu komplikasyonların nedenlerinden biri olabilir. Bu çalışmada, kronik sigara ve alkol tüketiminin izole term-gebe sıçan miyometriyum şeritlerinin fonksiyonel yanıtlarına etkisini araştırdık. Yöntem: 21 Wistar albino sıçanı üç gruba ayrıldı: Kontrol; Sigara grubu, sıçanlar 12 hafta boyunca sigara dumanına maruz kaldı; Alkol grubu, sıçanlara 12 hafta boyunca etanol uygulandı (n = 7, her bir grupta). Doğum dönemlerinde bulunan sıçanlardan izole edilen miyometriyal düz kas şeritleri, izometrik kayıt almak üzere organ banyosuna yerleştirildi. Karbakol (10-8-10-4 M), oksitosin (10-9-10-3 M) ve diltiazem (10-8-10-4 M) kümülatif konsantrasyonlarının miyometriyal spontan kasılmalar üzerindeki etkileri ölçüldü. Bulgular: Karbakol kasılma yanıtlarının amplitüd ve frekansları sigara grubunda anlamlı olarak artarken, alkol grubunda azaldı. Oksitosin ile indüklenen miyometriyal kasılmaların frekansı sigara maruziyetiyle artarken, kasılmaların amplitüdü değişmedi. Amplitüd ve frekans olarak oksitosin kasılmaları alkol grubunda azaldı. Her iki grupta da diltiazem gevşeme yanıtları arasında kontrollerine göre anlamlı olarak fark yoktu. Sonuç: Bu bulgular miyometriyal düz kasının kasılma ve gevşeme yanıtlarını değiştirmek yoluyla, sigara maruziyetinin erken doğuma neden olabileceğini ve alkol maruziyetinin gebelik süresini uzatabileceğini göstermektedir. Diltiazem gebelikte her iki durumda da tokoliz için yararlı bir etkiye sahip olabilir.

Amaç: Bu çalışmanın amacı, streptozotosin (STZ) ile diyabet oluşturulmuş sıçanlarda vas deferens kontraktilitesi üzerinde resveratrolün antioksidan etkilerini araştırmaktır. Gereç ve Yöntem: Erişkin erkek Wistar Albino sıçanlar kontrol, diyabetik ve resveratrol tedavisi uygulanan diyabetik olarak üç gruba ayrılmıştır. Diyabet, tek doz i.p. STZ enjeksiyonuyla (50mg/kg) oluşturulmuş ve STZ enjeksiyonundan 2 gün sonra hiperglisemi (>300 mg/dl) olan hayvanlar diyabetik olarak kabul edilmiştir. Tedavi grubundaki sıçanlara 4 hafta boyunca (20 mg/kg/gün, i.p.) resveratrol uygulanmıştır. 4 hafta sonunda sıçanların vas deferens dokuları izole edilmiş ve bu dokularda noradrenalin, ATP, elektriksel alan uyarısı (EAU) aracılı yanıtlar elde edilmiştir. Bulgular: Diyabetik sıçanlarda kontrol grubuna göre noradrenalin ve ATP aracılı yanıtlar anlamlı olarak artarken, EAU aracılı yanıtlar azalmıştır. EAU aracılı yanıtlar pirogallol varlığında diyabetik sıçanlarda kontrol sıçanlarına göre daha fazla inhibe olmuştur. Tempol varlığında ise EAU aracılı yanıtlardaki artış, diyabetik grupta kontrol grubuna göre anlamlı olarak fazla bulunmuştur. Resveratrol tedavisi, diyabetik sıçanlarda artan noradrenalin ve ATP aracılı yanıtları anlamlı olarak azaltmış, azalan EAU aracılı yanıtları ise artırmıştır. Sonuç: Bu çalışma resveratrol tedavisinin diyabetik sıçanlarda vas deferens kontraktilitesindeki bozukluğu antioksidan etkileri aracılığıyla düzelttiğini ortaya koymuştur. Sonuçlar, diyabet ile ilişkili ejakülasyon bozukluklarında oksidatif stresin rol oynayabileceğini ve antioksidan tedavinin bu bozukluklarda etkili olabileceğini düşündürmektedir.

We investigated the effect of resveratrol on endothelial and neuronal nitric oxide synthase (eNOS and nNOS) expression in the corpus cavernosum from chronic unpredictable mild stress (CUMS)-exposed rats in order to examine possible role of proinflammatory cytokines, which might play a role on erectile dysfunction (ED). Rats were randomly and equally divided into four groups such as control, control+resveratrol, CUMS and CUMS + resveratrol (20 mg/kg/day, i.p/8 weeks). Sucrose intake and forced swimming tests were used to evaluate depressive-like behaviors. nNOS, eNOS expressions, inflammatory markers, corticosterone and testosterone levels were analyzed either in blood samples and/or penile tissues. CUMS-exposed rats displayed depressive-like behaviors, reduced penile nNOS and eNOS expressions, and serum testosterone levels and enhanced serum and penile tissue levels of proinflammatory markers compared to controls. Resveratrol reversed depressive-like behaviors and suppressed serum and penile levels of proinflammatory markers, increased nNOS and eNOS expressions and testosterone levels in CUMS-exposed rats. Resveratrol exerted antidepressant-like effects and protected the development of CUMS-induced impairment of cavernosal eNOS and nNOS expressions associated with ED, which might be related to its anti-inflammatory action.

Erectile dysfunction (ED) has been reported to be associated with inflammation. This study investigated the effects of tumor necrosis factor alpha (TNF-α) inhibitor etanercept on penile neuronal nitric oxide synthase (nNOS) and endothelial nitric oxide synthase (eNOS) expressions, testosterone concentrations, neurogenic and endothelium-dependent relaxations of corpus cavernosum (CC), and circulating and cavernosal levels of inflammatory markers in aged rats. Animals were separated into control, aged, and etanercept-treated aged groups. Aged rats displayed significantly increased serum and cavernosal TNF-α, C-reactive protein (CRP), monocyte chemoattractant protein-1 (MCP-1) and intercellular adhesion molecule (ICAM–1) levels, and decreased penile nNOS and eNOS expressions and serum testosterone levels compared with controls. In etanercept-treated aged group, NOS expressions were similar to that of the control group. The circulating and cavernosal concentrations of TNF-α, CRP, MCP-1, ICAM-1, and testosterone were also normalized by etanercept. Neurogenic and endothelium-dependent relaxant responses significantly decreased in aged rats and etanercept treatment markedly improved these relaxation responses. Our findings indicate that aging decreases penile NOS expression, neurogenic and endothelium-dependent relaxations of CC, and also suppresses serum testosterone levels by inducing inflammatory response that may contribute to the development of ED. TNF-α antagonism may be a novel strategy to treat aging-associated ED.

Chronic stress is an important public health problem known as a risk factor for depression, cognitive deficits, and also erectile dysfunction (ED). Resveratrol, a plant polyphenol, was reported to activate constitutive endothelial nitric oxide synthase (eNOS). Although resveratrol has been proven to exert beneficial effects on the unpredictable chronic mild stress (UCMS)-induced decline in cognitive functions, its potential protecting effect on the penile tissue subjected to UCMS was in fact not investigated. Therefore, restorative effects of resveratrol on neurogenic and endothelium-dependent relaxations were evaluated in the corpus cavernosum of rabbits exposed to UCMS. Eighteen male New Zealand white rabbits were assigned into three groups (n = 6 in each group): controls; UCMS; and UCMS rabbits treated with resveratrol (20 mg/kg/day, i.p.) for 12-week period of stress induction. UCMS was induced by a couple of defined adverse conditions applied in a shuffled order for 12 weeks. Neurogenic and endothelium-dependent relaxations of corpus cavernosum were assessed by using organ bath studies. Both the electrical field stimulation (EFS)-induced neurogenic and carbachol-induced endothelium-dependent relaxant responses significantly decreased in physiological stress and resveratrol treatment exhibited a marked improvement in these relaxation responses in vitro. Our results indicated that chronic psychological stress could lead to ED by reducing neurogenic and endothelium-dependent relaxations and resveratrol prevents impairment of the functional responses, suggesting a potential new treatment approach for treatment of ED during psychological stress.

Normal aging may lead to cognitive deficits, which is associated with endothelial dysfunction and neuroinflammation. Dysregulation of TNFα expression contributes to vascular aging and dementia. In this study, we investigated the effects of etanercept, which is a TNFα inhibitor, on cognitive and endothelial function in aged rats. Male Wistar albino rats were divided into 3 groups: Young (4 month), aged (24 month) aged+ETA (24 month+etanercept). Etanercept (0.8 mg/kg/weekly) was given to the aged+ETA group subcutaneously for 8 weeks. Then passive avoidance test (PAT) and the Morris water maze test (MWMT) were used to evaluate cognitive functions of rats. After the behavioral tests, the rats were subjected to systolic blood pressure (SBP) measurement, and then endothelial function of thoracic aorta was evaluated by isolated organ bath system. Thoracic eNOS expression, hippocampal BDNF expression and serum and hippocampal TNF levels were also measured. In aged rats, it was shown that cognitive performances in MWMT and PAT were abolished whereas SBP unchanged. Furthermore, aging resulted in endothelial dysfunction, decreased expressions of thoracic eNOS and hippocampal BDNF, and increased level of TNF in serum and hippocampus. In contrast, ETA improved age-related cognitive deficits and endothelial dysfunction. In addition, ETA reversed changes in protein expression in aged rats. The results of this study indicate that ETA prevents cognitive deficits, endothelial dysfunction, peripheral and neuro-inflammation and decreament of neurotrophin expression in aged rats. These findings suggest that ETA may be beneficial with neuroprotective and vasculoprotective effects in elderly patients.

Amac: Bu calismada, genetik absans epilepsili WAG/Rij sicanlarda kronik etosuksimid (ETS) tedavisinin absans nobetler ve gozlenebilecek olasi kardiyovaskuler degisiklikler uzerindeki etkilerinin arastirilmasi amaclanmistir. Gerec ve Yontem: Iki aylik erkek Wistar ve WAG/Rij sicanlar; Wistar kontrol, Wistar ETS, WAG/Rij kontrol ve WAG/Rij ETS gruplarina ayrilmistir (n=20). ETS gruplari 3 ay boyunca kronik ETS tedavisi (oral, 300 mg/kg/gun) almislardir. Uc aylik tedavi periyodunun sonunda EEG kayitlari kullanilarak diken dalga desarjlarinin (DDD) toplam sure, ortalama sure ve sayisi degerlendirilmistir. Ortalama arteriyel kan basinci (OAB) ve kalp hizi (KH) olcumleri gerceklestirilmistir. Bulgular: ETS tedavisi WAG/Rij sicanlarda DDD’leri toplam sure, ortalama sure ve sayi acisindan anlamli olarak azaltmistir. OAB, WAG/Rij kontrol grubunda Wistar kontrol grubuna gore anlamli olarak artmistir. KH, Wistar ETS grubunda Wistar kontrol grubuna gore anlamli olarak azalmistir. KCl aracili kasilma yanitlarinda Wistar kontrol grubuna gore Wistar ETS grubunda anlamli artma, WAG/Rij kontrol grubunda anlamli azalma saptanmistir. Sonuc: Sonuclarimiz OAB ve vaskuler reaktivitenin WAG/Rij sicanlarda arttigini gostermistir. ETS tedavisi, WAG/Rij sicanlarda kardiyovaskuler parametreleri degistirmezken Wistar sicanlarda KH ve vaskuler reaktiviteyi azaltmis OAB’yi etkilememistir. Bu degisikliklerde T-tipi Ca++ kanallarinin rol oynayabilecegi dusunulmektedir.

Chronic stress is associated with male sexual problems including ejaculatory dysfunctions. The aim of this study was to determine whether resveratrol (RS) or quercetin (QE) has protective effects on vas deferens (VD) contractility in the unpredictable chronic mild stress (UCMS) rat model of depression. Animals were separated into six groups: control, control + RS and control + QE, stress, stress + RS, and stress + QE. Stress groups were subjected to UCMS procedure for 5 weeks. Animals in treatment groups were injected intraperitoneally with RS (20 mg/kg) or QE (30 mg/kg) for 5 weeks during UCMS period. UCMS caused depressive-like behaviors and enhanced systemic levels of corticosterone. The nerve-evoked contractile responses of VD significantly impaired and, noradrenaline- and ATP-induced contractile responses of VD significantly increased in stressed rats. UCMS exposure also markedly enhanced oxidative stress and inflammation in VD tissues. Treatment with RS or QE significantly ameliorated all the aforementioned parameters. The current study demonstrated that RS or QE protected against chronic stress-induced VD dysfunction by their antioxidant and anti-inflammatory effects on VD, suggesting that oxidative stress and inflammation may be synergistic parts in the development of VD dysfunction associated with chronic stress-induced depression.

Pro-inflammatory cytokines have been shown to be associated with the development of seizures in the WAG/Rij rat model of absence epilepsy. Importantly, WAG/Rij rats also exhibit cognitive deficits and depression-like behaviors. It is possible that pro-inflammatory cytokines mediate these comorbid conditions of absence epilepsy given their well-established effects on cognition and affective responses. The current study investigated the potential therapeutic effect of etanercept (tumor necrosis factor inhibitor) on cognitive impairment, depression-like behavior, and spike-wave discharges (SWDs) typically observed in the WAG/Rij rats. Eight-month-old male WAG/Rij rats and Wistar controls were tested in Morris water maze (MWM), passive avoidance (PA), forced swimming, sucrose preference, and locomotor activity tests, and electroencephalogram (EEG) recordings were taken from a separate group of WAG/Rij rats after 8 weeks of etanercept or vehicle treatment. Consistent with earlier work, WAG/Rij rats exhibited cognitive deficits and depression-like behavior. From these, the cognitive deficits and despair-like behavior were rescued by etanercept administration, which also reduced the frequency of SWDs without affecting their duration. Our results support the hypothesis that pro-inflammatory cytokines mediate the absence seizures and comorbid symptoms of absence epilepsy.

Aksöz, Elif (Balikesir Author), Background: Alzheimer's disease (AD) is the most common neurodegenerative disease in the world. One of the most commonly prescribed oral antidiabetic drug, metformin, has been shown to have beneficial effects on restoring impaired cognitive function. In the present study, we investigated the effects of metformin on spatial memory in terms of alleviating scopolamine-induced learning and memory impairments in rats by using the Morris water maze (MWM) test and the modified elevated plus-maze (mEPM) test. Furthermore, we investigated the possible mechanisms of action of metformin in preventing cognitive dysfunction. Methods: Male Wistar rats received metformin (50, 100, or 200 mg/kg/day) via gavage feeding for three weeks. Scopolamine was administered intraperitoneally before the probe step of the MWM test or the acquisition session of the mEPM test. Results: The learning and memory impairment induced by scopolamine was reversed by metformin. In addition, metformin improved the level of phosphorylated AMP-activated protein kinase and cAMP responsive element binding protein. However, metformin pretreatment had no impact on inhibiting the scopolamine-induced changes in acetylcholine levels. Furthermore, metformin exerted its antioxidant effect by significantly reversing scopolamine-induced changes in malondialdehyde, total antioxidant status, and superoxide dismutase levels in the hippocampus. Conclusion: Our results indicate that one of the most commonly used antidiabetic drug, metformin, has the potential to prevent the development of dementia and be a novel therapeutic drug for the amelioration of cognitive dysfunction in AD., Balikesir University

Psychological stress may lead to erectile dysfunction (ED), and inflammation has been evaluated as a major contributing factor. The goal of this study was to investigate the effects of etanercept (ETN), an anti-tumor necrosis factor α (TNF-α) protein, on cavernosal function in the unpredictable chronic mild stress (UCMS) rat model of depression. Animals were divided into 4 groups: animals not exposed to UCMS, animals not exposed to UCMS and treated with ETN, animals exposed to UCMS, and animals treated with ETN while exposed to UCMS. UCMS significantly impaired the neurogenic and endothelium-dependent relaxation responses; reduced cavernosal endothelial nitric oxide (NO) synthase (eNOS) and neuronal NO synthase (nNOS) expressions; decreased testosterone levels; enhanced systemic levels of corticosterone, TNF-α, interleukin 1β (IL-1β), interleukin 6 (IL-6), monocyte chemoattractant protein-1 (MCP-1), and intercellular adhesion molecule 1 (ICAM-1); and also increased cavernosal levels of TNF-α, IL-1β, and IL-6 in rats. ETN administration restored NO-mediated neurogenic and endothelium-dependent relaxation responses of the corpus cavernosum, increased cavernosal eNOS and nNOS expressions, enhanced testosterone levels, and decreased corticosterone levels in UCMS-exposed rats. Also, systemic inflammatory markers and cavernosal proinflammatory cytokine levels were reduced by ETN. Our results demonstrate the role of TNF-α-mediated inflammation in the development of depression and ED in rats exposed to chronic stress.

Introduction Diabetes is associated with anxiety and depression. Resveratrol, one of the most potent natural polyphenols with antioxidant properties, has been demonstrated to have benefits against diabetes. In the current study, we investigated the effects of resveratrol on depression and anxiety-like behaviors in diabetic rats. Methods Adult male Wistar albino rats were assigned for control and diabetic groups, and these groups were divided into four subgroups as follows: Saline-treated, DMSO-treated, resveratrol-treated and imipramine-treated animals (n=10). Diabetes was induced by a single intraperitoneal injection of streptozotocin (STZ) (50 mg/kg), and 2 days after the STZ injection the rats having hyperglycemia (>300 mg/dl) were assigned to be diabetic. Rats in treatment groups were injected intraperitoneally with resveratrol (20 mg/kg) and imipramine (10 mg/kg) for 4 weeks. After 4-week-treatment period, tail suspension test (TST), forced swimming test (FST), elevated plus maze test (EPM) and locomotor activity test were performed. Blood samples were collected to estimate serum superoxide dismutase (SOD) and NADPH oxidase (Nox) levels. Results Diabetic rats displayed depressive-like behaviors in the FST and TST, and anxiety-like behaviors in the EPM. Resveratrol and imipramine decreased anxiety-like and depressive-like behaviors without affecting locomotor activity in diabetic rats. A significant reduction in SOD levels and a marked increase in Nox levels were observed in diabetic rats. Resveratrol treatment normalized these levels, while imipramine did not affect neither SOD nor Nox levels. Conclusion This study indicates that chronic resveratrol treatment may able to treat comorbid anxiety-and depressive-like behaviors in diabetes through inhibition of oxidative stress.