Browsing by Author "Meral, Ismail"

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Catalase and Carbonic Anhydrase Enzyme Activities, and Some Mineral-Heavy Metal Concentrations in Newborns With Congenital Malformations
(Ortadogu Ad Pres & Publ Co, 2011) Melek, Mehmet; Demir, Halit; Kirimi, Ercan; Meral, Ismail; Keskin, Siddik
Objective: The aim of this study is to evaluate the factors such as antioxidant condition and mineral-heavy metal level association that may play a role in development of congenital malformations. Material and Methods: Fifteen healthy neonates as control group and 15 neonates with various congenital malformations were included study. Erythrocyte cataly (CAT) which is an antioxidant enzyme, erythrocyte carbonic anydrase (CA) enzyme activities which play a important role in acid-base balance, serum copper (Cu), lead (Pb), zinc (Zn), cadmium (Cd), iron (Fe), manganese (Mn) and magnesium (Mg) were measured from venous blood samples of each subject. Results: Erythrocyte CAT enzyme activity, serum Zn and Fe levels were statistically significantly decreased (P<0.05) in the study group while serum Cu and Cd levels were statistically significantly high (P<0.05)in the study group when compared to the control group. A negative correlation between erythrocyte CA activity and serum Pb levels was found in the study group. In the control group, negative correlations were found between erythrocyte CAT activity and serum Pb levels; serum Mg and Cu levels; and serum Cd and Mn levels. In addition, in the control group a positive correlation between serum Zn and Cu levels; erythrocyte CA activity and serum Mn levels was found. Conclusion: Our results suggest that erythrocyte CAT enzyme activity and serum Cu, Zn, Fe and Cd levels may play a role in pathogenesis of congenital malformations. The oxidative stress that rise as a result of an imbalance between prooxidant and antioxidant reactions seems to be associated with congenital malformations. Further studies are needed to confirm the association of antioxidant condition and mineral-heavy metal levels in the pathogenesis of congenital malformations.
Complex Regional Pain Syndrome: a Vitamin K Dependent Entity
(Churchill Livingstone, 2010) Ediz, Levent; Hiz, Ozcan; Meral, Ismail; Alpayci, Mahmut
Complex regional pain syndrome (CRPS) is the complication of some injuries, such as a fracture, which affects the distal end of the injured extremity characterized by pain, allodynia, hyperalgesia, edema, abnormal vasomotor and sudomotor activity, movement disorders, joint stiffness, regional osteoporosis, and dystrophic changes in soft tissue. Exact pathogenic mechanism of CRPS is still unclear. Suggested pathogenic mechanisms of CRPS are evaluated in four major groups consist of classic inflammation, hypoxic changes and chronic ischemia, neurogenic inflammation and sympathetic dysregulation. All of these suggested pathogenic mechanisms produced by inflammatory cytokines mediated by nuclear factor kappaB. Vitamin K is a family of structurally similar, fat-soluble, 2-methyl-1,4-naphthoquinones. Vitamin K exerts a powerful influence on bone formation, especially in osteoporosis. Fat in bone stores some vitamin K. Gamma-carboxylation of the glutamic acid in osteocalcin is vitamin K dependent. Osteocalcin plays a role in calcium uptake and bone mineralization. Osteocalcin, the most abundant non-collagenous protein in bone, is produced by osteoblasts during bone matrix formation. Because osteocalcin is not carboxylated in case of vitamin K deficiency at the distal site of fracture or injury, it cannot bind to hydroxyapatite causing osteoporosis. Fracture starts a local inflammatory process in the fracture site and adjacent tissues as seen in CRPS. Vitamin K was shown to suppress the inflammatory cytokines and NF-kappaB and prevent oxidative, hypoxic, ischemic injury (which have key role in both initiation and progression of CRPS) to oligodendrocytes and neurons. We hypothesized that vitamin K has a key role and modulatory effect in CRPS pathogenesis. Vitamin K deficiency at the distal site of fracture occurs because of diminished and slowed circulation, local immobilization after extremity fracture or injury and use of vitamin K store at the distal site of the injured extremity and in the circulation for fracture healing and bone remodelling. In case of vitamin K deficiency at the distal site of fracture, classic inflammation starts with fracture at the distal tissues could not be restricted and classic inflammation, hypoxic changes, chronic ischemia, neurogenic inflammation, sympathetic dysregulation, which are the pathogenic mechanisms of CRPS, and patchy osteoporosis which occur due to high level of under-carboxylated osteocalcin could not be prevented. Briefly vitamin K level decreases in the distal site of the injured extremity consequently resulting in patchy osteoporosis due to high level of under-carboxylated osteocalcin and unrestricted inflammation which are the cause for both initiation and progression of CRPS. (C) 2010 Elsevier Ltd. All rights reserved.
Effect of Crush and Axotomy of Phrenic Nerves on Oxidative Stress in Diaphragm Muscle of Rats
(Wiley, 2012) Sayir, Fuat; Kavak, Servet; Meral, Ismail; Demir, Halit; Cengiz, Nurettin; Cobanoglu, Ufuk
Introduction: In this study we investigated the effect of crush and axotomy of phrenic nerves on oxidative stress and antioxidant enzyme activities in rat diaphragm muscle. Methods: The animals in the first group were not crushed or axotomized and served as controls. Phrenic nerves of the rats in the second and third groups were crushed or axotomized in the diaphragm muscle. Results: The malondialdehyde level increased in diaphragm muscles after both crush and axotomy. The antioxidant enzymes, such as superoxide dismutase, glutathione peroxidase, carbonic anhydrase, and catalase, decreased in diaphragm muscles after both crush and axotomy. Conclusions: Crushing or axotomizing the phrenic nerves may produce oxidative stress in the diaphragm muscle of the rat by increasing lipid peroxidation and decreasing antioxidant enzyme activities. Muscle Nerve, 2012
The Effect of Drospirenone/Estradiol Treatment on Catalase and Carbonic Anhydrase Enzyme Activities, and Some Mineral Concentrations in Ovariectomized Rats
(Parlar Scientific Publications (p S P), 2011) Alkis, Ismet; Kavak, Servet; Meral, Ismail; Oto, Gokhan; Demir, Halit
This study was designed to investigate the effect of drospirenone/estradiol (Angeliq (R)) on erythrocyte CAT and CA enzyme activities, and serum Fe, Mg, Co, Cu, Zn, Pb, Mn and Cd concentrations in ovariectomized- and drospirenone/estradiol-treated rats. Forty Female Wistar-albino rats were divided randomly into four groups, each consisting of ten rats. The animals in the first group were not treated, and served as control. The animals in the second group were operated but not ovariectomized and served as sham group. The animals in the third group were operated, ovariectomized but not treated with drospirenone/estradiol and served as ovariectomized group. The animals in the fourth group were operated, ovariectomized and treated with 0.01 mg/kg 17 beta-estradiol and 0.02 mg/kg drospirenone daily, p.o. for four weeks. Blood samples were collected at the end of the application period for the determination of the erythrocyte catalase (CAT) and carbonic anhydrase (CA) enzyme activities as well as serum Fe, Mg, Co, Cu, Zn, Pb, Mn and Cd concentrations. It was found that although erythrocyte CAT enzyme activity decreased in sham group, CA enzyme activity increased in angeliq group. Serum Pb levels of angeliq group and serum Mg levels of sham, ovariectomized and angeliq groups decreased. Serum Co, Cu, Mn and Fe levels increased in angeliq group. There was no significant difference among groups with regard to the serum Cd or Zn levels. It was concluded that hormonal replacement therapy might provide beneficial effects on blood antioxidant enzyme activity, heavy metal and some trace element levels in menopause. However, more studies are needed to verify and clarify the relationship between the hormonal replacement therapy and blood antioxidant status and trace element levels in menopause.
Effect of Levosimendan Injection on Oxidative Stress of Rat Myocardium
(Sage Publications inc, 2013) Basel, Halil; Kavak, Servet; Demir, Halit; Meral, Ismail; Ekim, Hasan; Bektas, Hava
This experiment was designed to investigate the effect of levosimendan injection on lipid peroxidation product malondialdehyde (MDA) and antioxidant glutathione (GSH) levels, and activities of antioxidant enzymes in myocardium of rats. Twenty male Wistar-albino rats were divided randomly into 2 study groups, each consisting of 10 rats. The animals in the first group were not treated with drug and served as control. It was found that the MDA and GSH levels decreased in levosimendan injected group. Superoxide dismutase, glutathione peroxidase, catalase and carbonic anhydrase enzyme activities were lower in levosimendan injected group than controls. It was concluded that lower tissue free radical level caused by levosimendan injection led to a lower antioxidant enzymes synthesis in the body and a decrease in the antioxidant enzyme activity and free radical scavenger level in myocardium of rat.
Effect of Oral Vitamin E Supplementation on Oxidative Stress in Guinea-Pigs With Short-Term Hypothermia
(Wiley, 2007) Aslan, Leyla; Meral, Ismail
Effects of oral vitamin E supplementation on blood malondialdehyde (MDA), glutathione (GSH) and vitamin E levels and superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) enzyme activities in acute hypothermia of guinea-pigs were investigated. Thirty male guinea pigs, weighing 500-800g were randomly divided into one of three experimental groups: A (control, without cooling), B (hypothermic) and C (hypothermic with vitamin E supplementation). The guinea-pigs of group C received daily oral supplementation of 460mg kg(-1) bw vitamin E for 4 days before inducing hypothermia. Twenty-four hours after the last vitamin E supplementation, the guinea-pigs of the B and C groups were cooled by immersion into cold water (10-12 degrees C), and the control guinea-pigs were immersed into water of body temperature (37 degrees C) up to the neck for 5 min without using any anaesthetic or tranquilizer. Rectal body temperatures of groups were measured and blood samples for biochemical analysis were collected immediately after the cooling. The body temperature, GSH and vitamin E levels and GSH-Px enzyme activity of hypothermic guinea-pigs were lower (p < 0.05), but SOD enzyme activity was not different (p > 0.05) from those of control animals. Although, the body temperature of hypothermic with vitamin E supplementation group was lower (p < 0.05), all other parameters of this group were not different (p > 0.05) from the controls. It was concluded that oral supplementation of vitamin E can alleviate the lipid peroxidation-induced disturbances associated with hypothermia by increasing the serum vitamin E level to normal. However, more studies are needed to prove whether this vitamin can improve quality of life during the cold seasons. Copyright (C) 2007 John Wiley & Sons, Ltd.
Effect of Ryanodine Decreasing the Positive Inotropic Effect of Monensin
(1996) Meral, Ismail
Bu çalışmada erkek kobaylardan izole edilen papillar kaslar kullanılarak ryanodin'in monensin zehirlenmesini gidermedeki etkinliği araştırıldı. Papillar kasların kasılma şiddeti (KŞ), kasılma hızı (KH) ve gevşeme hızı (GH) monensin veya monensin+ryanodin tatbikinden bir saat sonra ölçüldü. Monensin'in, tatbikinden bir saat sonra KŞ ve KH'yı artırtığı ancak GH'yı değiştirmediği saptandı. Ancak monensin+ryanodin tatbik edilen kasların KŞ'si ve KH'sının sadece monensin tatbik edilenlerden daha düşük olduğu bulundu. Bu bulgular ışığı altında, ryanodinin hücre içerisindeki kalsiyum konsantrasyonunda oluşturduğu bu azalmadan dolayı monensin zehirlenmesini gidermede kullanılabileceği sonucuna varıldı.
Effects of 900-Mhz Electromagnetic Field Emitted From Cellular Phone on Brain Oxidative Stress and Some Vitamin Levels of Guinea Pigs
(Elsevier, 2007) Meral, Ismail; Mert, Handan; Mert, Nihat; Deger, Yeter; Yoruk, Ibrahim; Yetkin, Aysen; Keskin, Siddik
This study was designed to demonstrate the effects of 900-MHz electromagnetic field (EMF) emitted from cellular phone on brain tissue and also blood malondialdehyde (MDA), glutathione (GSH), retinol (vitamin A), vitamin D3 and tocopherol (vitamin E) levels, and catalase (CAT) enzyme activity of guinea pigs. Fourteen male guinea pigs, weighing 500-800 g were randomly divided into one of two experimental groups: control and treatment (EMF-exposed), each containing seven animals. Animals in treatment group were exposed to 890- to 915-MHz EMF (217-Hz pulse rate, 2-W maximum peak power, SAR 0.95 w/kg) of a cellular phone for 12 h/day (11-h 45-min stand-by and 15-min spiking mode) for 30 days. Control guinea pigs were housed in a separate room without exposing EMF of a cellular phone. Blood samples were collected through a cardiac puncture and brains were removed after decapitation for the biochemical analysis at the end of the 30 days of experimental period. It was found that the MDA level increased (P < 0.05), GSH level and CAT enzyme activity decreased (P< 0.05), and vitamins A, E and D3 levels did not change (P > 0.05) in the brain tissues of EMF-exposed guinea pigs. In addition, MDA, vitamins A, D3 and E levels, and CAT enzyme activity increased (P < 0.05), and GSH level decreased (P < 0.05) in the blood of EMF-exposed guinea pigs. It was concluded that electromagnetic field emitted from cellular phone might produce oxidative stress in brain tissue of guinea pigs. However, more studies are needed to demonstrate whether these effects are harmful or/and affect the neural functions. (C) 2007 Elsevier B.V. All rights reserved.
The Effects of Cichorium Intybus Extract on Cerebellar Apoptosis and Oxidative Stress in Pentylenetetrazole-Induced Kindling Model in Rats
(Wiley-blackwell, 2016) Meral, Ismail; Gurevin, Ebru Gurel; Ustunova, Savas; Demirtas, Murat; Ozturk, Nilgun; Kiyan, Hulya Tuba; Erkec, Ozlem Ergul
Effects of Cichorium Intybus Extract on Seizure Development, Bcl-2, Siklin B1 Ve Β-Tubulin Levels in Pentylenetetrazole-Kindling Model of Epilepsy in Rats
(Wiley-blackwell, 2015) Erkec, Ozlem Ergul; Meral, Ismail; Kara, Mehmet; Kocyigit, Abdurrahim; Armagan, Metin; Ozer, Omer Faruk
Effects of Cichorium Intybus on Gabaa Receptors and Apoptosis in Pentylenetetrazole-Induced Kindling in Rats
(Kare Publ, 2021) Ergul Erkec, Ozlem; Meral, Ismail; Kara, Mehmet; Esrefoglu, Mukaddes; Tok, Olgu Enis; Ustunova, Savas; Armagan, Metin
Objectives: This study was designed to determine the effects of Cichorium intybus (CI) on apoptosis and GABA(A) receptor density in the brains of rats in pentyleneterazole induced kindling. Methods: The rats were divided into three groups: Control group, pentylenetetrazol administered (PTZ) group, and PTZ+CI extract administered (PTZ+CI) group. Control group received only physiological saline (0.5 ml). PTZ (35 mg/kg) injected to the animals in the PTZ and PTZ+CI groups. The CI extract (200 mg/kg) was also administered to the PTZ+CI group. A 75 mg/kg challenge dose of PTZ was administrated to the PTZ treated groups, on the 12th injection. Results: A significant increase was found in the number of neurons expressing the GABA(A) receptor in the brain tissue (hippocampus and cerebral cortex) of the PTZ group when compared to the control. The density of GABA(A) receptor of the neurons in the cerebral cortex significantly increased in PTZ administered groups compared to the control.The number of apoptotic neurons was found non-significant between groups in the brain. Conclusion: CI treatment prolonged the onset of the first seizure activity and seizure latency at a convulsive dose, and kept the number of GABA(A) receptors close to that of the control in the hippocampus.
Effects of Crush and Axotomy on Oxidative Stress and Some Trace Element Levels in Phrenic Nerve of Rats
(Pergamon-elsevier Science Ltd, 2013) Sayir, Fuat; Kavak, Servet; Meral, Ismail; Demir, Halit; Cengiz, Nurettin; Cobanoglu, Ufuk
This study was designed to investigate the effect of crush and axotomy on oxidative stress and some trace element levels in phrenic nerve of rats. Eighteen male Wistar-albino rats were divided randomly into three groups, each consisting of 6 rats. The animals in the first group were not crushed or axotomized and served as control. Phrenic nerves of the animals in the second and third groups were crushed and axotomized, respectively. Animals in all groups were sacrificed one week after the crush or axotomy, and degenerated phrenic nerves were harvested for the determination of tissue oxidative stress and trace element levels. Lipid peroxidation product malondialdehyde and antioxidant glutathione levels increased in both crushed and axotomized phrenic nerves. The activities of antioxidant enzymes such as superoxide dismutase, catalase and glutathione peroxidase were lower in crushed and axotomized phrenic nerves than in controls. The levels of Fe, Pb, Mn, Cd and Co increased, and Mg and Cu levels decreased in crushed phrenic nerves. The levels of Fe and Mg decreased, Pb and Co levels increased in axotomized phrenic nerves. It was concluded that crushing or axotomizing the phrenic nerves may produce oxidative stress by increasing lipid peroxidation and decresing antioxidant enzyme activities. It was also concluded that while crush to phrenic nerves causes accumulation of minerals, axotomizing phrenic nerves causes depletion of minerals in the tissues. (C) 2011 Elsevier Inc. All rights reserved.
Effects of Extracorporeal Shock-Wave Lithotripsy Directed at the Parotid Gland on Oxidative Stress Parameters and Some Trace Element Levels in Facial Nerve of Rats
(Wiley, 2012) Kavak, Servet; Garca, M. Fatih; Gecit, Ilhan; Meral, Ismail; Cengiz, Nurettin; Demir, Halit
Introduction: This study was designed to assess the effect of extracorporeal shock-wave lithotripsy (ESWL) exposure of the parotid gland on oxidative stress and some trace element levels in the facial nerves of rats. Methods: Twelve male Wistar albino rats were divided into two groups, each consisting of 6 animals. The rats in the first group served as controls. The left parotid glands of animals in the second group were treated with 1000 18-kV shock waves while anesthetized with ketamine. The animals in both groups were euthanized 72 h after the ESWL treatment, and the right facial nerve was harvested for determination of oxidant/antioxidant status and trace element levels. Results: Lipid peroxidation product malondialdehyde (MDA) and antioxidant glutathione (GSH) levels increased, and the activities of antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px), decreased in the facial nerves of ESWL-treated rats. The levels of iron, lead, manganese, and cobalt increased, and magnesium, cadmium, and copper levels decreased. Conclusions: ESWL treatment of the parotid gland may increase lipid peroxidation and decrease antioxidant enzyme activity in adjacent tissues such as the facial nerve. It also causes a decrease or increase in many mineral levels of the facial nerve, which is an undesirable condition for normal physiological function. Muscle Nerve, 2012
Effects of Leontice Leontopetalum and Bongardia Chrysogonum Extracts on Pentylenetetrazole Kindling Epilepsy Modelin Rats
(Wiley-blackwell, 2016) Erkec, Ozlem Ergul; Arihan, Okan; Bulut, Gulay; Karatas, Ersin; Meral, Ismail; Ozgokce, Fevzi
Effects of Shock Waves on Oxidative Stress and Some Trace Element Levels of Rat Liver and Diaphragm Muscles
(Wiley, 2012) Gecit, Ilhan; Kavak, Servet; Meral, Ismail; Gunes, Mustafa; Pirincci, Necip; Sayir, Fuat; Ceylan, Kadir
This study was designed to investigate whether the short-term extracorporeal shockwave lithotripsy (ESWL) exposure to kidney produces an oxidative stress and a change in some trace element levels in liver and diaphragm muscles of rats. Twelve male Wistar albino rats were divided randomly into two groups, each consisting of six rats. The animals in the first group did not receive any treatment and served as control group. The right-side kidneys of animals in group 2 were treated with two-thousand 18?kV shock waves while anesthetized with 50?mg kg-1 ketamine. The localization of the right kidney was achieved after contrast medium injection through a tail vein under fluoroscopy control. The animals were killed 72 h after the ESWL treatment, and liver and diaphragm muscles were harvested for the determination of tissue oxidative stress and trace element levels. Although the malondialdehyde level increased, superoxide dismutase and glutathione peroxidase enzyme activities decreased in the livers and diaphragm muscles of ESWL-treated rats. Although glutathione level increased in liver, it decreased in diaphragm muscles of ESWL-treated animals. Fe, Mg and Mn levels decreased, and Cu and Pb levels increased in the livers of ESWL-treated animals. Fe and Cu levels increased, and Mg, Pb, Mn and Zn levels decreased in the diaphragm muscles of ESWL-treated animals. It also causes a decrease or increase in many mineral levels in liver and diaphragm muscles, which is an undesirable condition for the normal physiological function of tissues. Copyright (c) 2012 John Wiley & Sons, Ltd.
Effects of Shock Waves on Oxidative Stress in Parotid Gland of Rat
(Sage Publications inc, 2014) Garca, M. Fatih; Kavak, Servet; Gecit, Ilhan; Meral, Ismail; Demir, Halit; Turan, Mahfuz; Cankaya, Hakan
This study was designed to investigate whether extracorporeal shock wave lithotripsy (ESWL) exposure to parotid gland produces an oxidative stress in parotid glands of rats. Twelve male Wistar-albino rats, 6 months of age with an average body weight of 250-300 g, were divided randomly into two groups, each consisting of six rats. The animals in the first group did not receive any treatment and served as control. The left parotid glands of animals in group 2 (ESWL treated) received a thousand 18 kV shock waves after anesthetizing the rats with 50 mg/kg of ketamine. The animals in both groups were killed 72 hours after the ESWL treatment, and the parotid glands were harvested for the determination of lipid peroxidation product malondialdehyde (MDA), antioxidant glutathione (GSH) levels and the activities of antioxidant enzymes such as superoxide dismutase (SOD), GSH-Px and catalase (CAT). It was found that MDA level increased in parotid glands of rats after the ESWL treatment. The SOD, GSH-Px and CAT enzyme activities, and the level of antioxidant GSH decreased in parotid gland of rats after the ESWL treatment. It was concluded that short-term ESWL treatment caused an increase in the free radical production and a decrease in the antioxidant enzyme activity in parotid glands of ESWL-treated rats.
Effects of Shock Waves on Oxidative Stress, Antioxidant Enzyme and Element Levels in Kidney of Rats
(Springernature, 2011) Gecit, Ilhan; Kavak, Servet; Meral, Ismail; Pirincci, Necip; Gunes, Mustafa; Demir, Halit; Ceylan, Kadir
The aim of this study was to investigate the effect of extracorporeal shock wave lithotripsy (ESWL) on kidney oxidative stress and trace element levels of adult rats. Twelve male Wistar albino rats were divided equally into two groups. First group was used as control. The right-side kidneys of animals in second group were treated with 2,000 18-kV shock waves under anesthesia. Localization of the right kidney was achieved following contrast medium injection through a tail vein under flouroscopy control. The animals were sacrificed 72 h after the ESWL treatment, and the kidneys were taken. Malondialdehyde level was higher in the ESWL group than in the control. Reduced glutathione levels, superoxide dismutase, and glutathione peroxidase activities were lower in the ESWL group than those of the control. Fe, Cu, Pb, Mn, Cd, and Ni levels were lower in the ESWL group than in the control, although Mg level was higher in the ESWL group than in the control. In conclusion, the result of the present study indicated that ESWL treatment produced oxidative stress in the kidney and caused impairments on the antioxidant and trace element levels in the kidneys of rats.
An Enzymatic Method for Isolating Cardiac Myocytes From Heart of Guinea-Pig Used for Single-Cell and Patch-Clamp Studies
(1997) Meral, Ismail
A method for isolating cardiac myocytes from the heart of guinea-pig is described. This method consists of perfusion of the heart with a low Ca{2+} medium and subsequent dispersion of cells with collagenase and proteolytic enzyme. More than 80% rod-shoped, viable and quiescent cells which are suitable for electrophysiological and pharmacological experiments are obtained by this method.
Monensin Etkisinin Hücresel Mekanizmasi
(1996) Meral, Ismail
Bu makale monensinin en son bilinen etki mekanizması ve klinik olarak kullanımı hakkında özlü bilgiler vermektedir.
Peripheral Mononuclear Leukocyte Dna Damage, Plasma Prolidase Activity, and Oxidative Status in Patients With Benign Prostatic Hyperplasia
(Taylor & Francis Ltd, 2015) Gecit, Ilhan; Meral, Ismail; Aslan, Mehmet; Kocyigit, Abdurrahim; Celik, Hakim; Taskin, Abdullah; Ceylan, Kadir
Objectives: Prolidase plays a major role in collagen turnover, matrix remodeling, and cell growth. Benign prostatic hyperplasia (BPH) may be associated with an increased extracellular matrix deposition. Therefore, the present study was designed to investigate the plasma prolidase activity, oxidative status, and peripheral mononuclear leukocyte DNA damage in patients with BPH. Patients and methods: Twenty-six male patients with BPH and 24 healthy male subjects were included in this study. Blood samples were collected from antecubital vein after an overnight fasting period, and the plasma was separated. Plasma prolidase activity, total antioxidant capacity (TAC), total oxidant status (TOS), and oxidative stress index (OSI) were determined. The peripheral lymphocyte oxidative DNA damage was determined using an alkaline single cell gel electrophoresis assay (comet assay). Results: The plasma prolidase activity, TOS levels, OSI values, and peripheral mononuclear leukocyte DNA damage were significantly higher (P < 0.001), while the TAC levels were significantly lower (P < 0.001) in patients with BPH than controls. In BPH patients, the prolidase activity was significantly associated with TAC levels (r = -0.366, P < 0.05), TOS levels (r = 0.573, P < 0.001), and OSI (r = 0.618, P < 0.001) and peripheral mononuclear leukocyte DNA damage (r = 0.461, P < 0.001). Conclusions: Our results showed that BPH might be associated with an increased oxidative stress, and also an increased plasma prolidase activity. Increased prolidase activity might play an important role in the etiopathogenesis and/or progression of BPH.