جستجوی مقالات مرتبط با کلیدواژه "ischemia-reperfusion" در نشریات گروه "دامپزشکی"

Effects of interaperitoneal administration of α-tocopherol acetate on ischemia-reperfusion injury in ovaries torsion and detorsion were studied using a cat ovary model. Twenty healthy female DSH cats ~3 kg were randomized into five experimental groups (n = 5): Group SHAM: The cats underwent only celiotomy. Group Ischemia: A 3-hour ischemia only. Group I/R: A 3-hour ischemia and a 3-hour reperfusion. Group I/ATA: A 3-hour ischemia only and 10 mg/kg intraperitoneal administration (IP) of α-tocopherol 2.5 hours after induction of ischemia. Group I/R/ATA: A 3-hour ischemia, 3-hour reperfusion, and 10 mg/kg IP of α-tocopherol 2.5 hours after induction of ischemia. Animals treated with ATA showed significantly ameliorated development of ischemia and reperfusion tissue injury compared to those of other groups (p < 0.05). The significantly higher values of SOD, tGSH, GPO, GSHRd, and GST were observed in I/R/ATA animals compared to those of other groups (p = 0.001). Damage indicators (NOS, MDA, MPO, and DNA damage level) were significantly lower in I/R/ATA animals compared to those of other groups (p = 0.001). Intraperitoneal administration of ATA could be helpful in minimizing ischemia-reperfusion injury in ovarian tissue exposed to ischemia.

A rat testis model was used to assess effects of polyethylene glycol (PEG) clotrimazole microparticles on ischemia-reperfusion injury. Forty-eight healthy male Wistar rats were included and randomized into six investigational groups (n = 8): Group SHAM: Merely laparotomy was implemented. Group ISCHEMIA: Merely a 3-hour interval ischemia was done. Group I/R: A 3-hour interval ischemia, three-hour reperfusion for left testis, and one-week reperfusion for right testis were done and 20 µL normal saline was administered intraperitoneally (IP) 30 min before termination of ischemia. Group I/R/PEG: The same as group I/R as well as 20 µl PEG (IP) 30 min before termination of ischemia. Group I/R/CLTMZLMP: The same as group I/R and 20 µL (10 mg/kg) of clotrimazole microparticles (IP) 30 min before termination of ischemia. Group I/R/PEG-CLTMZLMP: The same as group I/R and 20 µL PEG-based clotrimazole microparticles (IP) 30 min before termination of ischemia. Evaluations were based on analyses of biochemical assays. PEG-based clotrimazole microparticles improved enhanced antioxidant activity (p < 0.05). PEG-based clotrimazole microparticles could be helpful in minimizing ischemia-reperfusion injury in testicular tissue exposed to ischemia.

Using a rat ovary model, protective effects of nano-methoxatin (NMXTN) were studied on ischemia-reperfusion injury. Following randomization of forty-eight healthy female Wistar rats ~250 g, the animals were subjected to eight experimental groups (n = 6): Group SHAM: Only laparotomy was performed. Group IS: Only a 3-hour ischemia was performed. Group IS/Oil: Only a 3-hour ischemia was performed and 50 µl soybean oil alone (Solvent of MXTN) was administered 30 min before cessation of ischemia. Group IS/REP: The procedure included a 3-hour ischemia followed by a 3-hour reperfusion and 50 µl soybean oil alone was administered 30 min before cessation of ischemia. Group IS/MXTN: The procedure included a 3-hour ischemia only and 50 µl (0.3 mmol/l/IP) of MXTN 30 min before cessation of ischemia. Group IS/NMXTN: The procedure included a 3-hour ischemia only and 50 µl (0. 3 mmol/l/IP) of NMXTN 30 min before cessation of ischemia. Group IS/REP/MXTN: The procedure included a 3-hour ischemia, a 3-hour reperfusion and 20 µl (0.3 mmol/l) of MXTN 30 min before cessation of ischemia. Group IS/REP/NMXTN: The procedure included a 3-hour ischemia, a 3-hour reperfusion and 20 µl (0.3 mmol/l) of NMXTN 30 min before cessation of ischemia. Significantly amended development of ischemia/reperfusion tissue injury was observed in animals treated with NMXTN compared to those of other groups (p = 0.001). Mean values of biochemical indices were significantly higher than those observed for other groups (p = 0.001). Significantly lower values of MDA were observed in IS/REP/NMXTN animals compared to those of other groups (p = 0.001). Where ovarian tissue is exposed to ischemia intraperitoneal administration of NMXTN could bear clinical benefits in diminishing ischemia-reperfusion injury.

The torsion model of testis in a rat was adopted for evaluation of possible effects of propolis (Prop) on ischemia-reperfusion (IS/REP) injury. The healthy male Wistar rats (totally 24 animals) were randomized into four groups (n = 6) and animals experienced bilateral testicular torsions as follows: In sham group just, laparotomy was performed and in IS group, animals experienced a 3 hr period testicular IS. In IS/REP group, a 3 hr period of IS followed by a 3 hr period of testicular REP for left testis and a one-week testicular REP for right testis were done. In this group animals were gavaged by 1.00 mL normal saline 1 hr before the onset of IS. In IS/REP/ Prop group, the same procedures for IS/REP animals were followed as well as gavage of 1.00 mL Prop extract solution 1 hr before the onset of IS. Analyses of biochemistry, histology, inflammatory biomarkers and sperm parameters were carried out. In IS/REP/Prop group, nitric oxide synthase malondialdehyde, myeloperoxidase and 8-hydroxy-2 deoxyguanine in IS/REP/Prop group were significantly decreased and, superoxide dismutase, total glutathione, glutathione peroxidase, glutathione reductase and glutathione S-transferase were significantly increased compared to the other animals. In IS/REP/Prop group, seminiferous tubules (with normal spermatogenesis) showed all stages of spermatogenic cells with plentiful spermatozoa. Tubular deterioration and atrophy and spermatogenic cell loss in were seen in a limited extent. The mean concentrations of Interleukin-1 beta and tumor necrosis factor alpha in IS/REP/Prop were significantly decreased. Sperm quality was significantly improved by Prop in IS/REP/Prop group. It was concluded that Prop could be supportive in diminishing IS/REP injury in testicular tissue exposed to ischemia.

Testicular torsion and detorsion are significant clinical issues for infertile men. Torsion of the spermatic cord is an emergency condition resulting from the rotation of the testis and epididymis around the axis of the spermatic cord. A rat testis model was used to assess the effects of polyethylene glycol on ischemia-reperfusion injury. Twenty-four healthy male Wistar rats were used. The rats were included and randomized into four investigational groups (n = 6): Group Sham: Merely laparotomy was implemented. Group Ischemia: Merely 3-hour interval ischemia was done. Group IS/REP: A 3-hour interval ischemia, 3-hour reperfusion for left testis, one-week reperfusion for right testis were done and 20 µl normal saline was administered intraperitoneally (IP) 30 min before termination of ischemia. Group IS/REP/PEG: The same as group IS/REP as well as 20 µl PEG solution 3% (IP) 30 min before termination of ischemia. Evaluations were based on biochemical analyses and sperm parameters morphometry. Polyethylene glycol enhanced antioxidant activity and quality of sperm parameters (p < 0.05). In conclusion, polyethylene glycol could be helpful in minimizing ischemia-reperfusion injury in testicular tissue exposed to ischemia

Testicular torsion and detorsion are important clinical problems for infertility in men. In fact, torsion of the spermatic cord is an emergency that results from the rotation of the testis and epididymis around the axis of the spermatic cord. Male factor infertility accounts for up to half of all cases of infertility and affects one man in 20 in the general population. Using a rat testis model, effects of cerium oxide nanoparticles (NCER) were studied on ischemia-reperfusion injury. Eighteen healthy male Wistar rats were used. The animals were subjected to three experimental groups (n = 6): Group Sham: Only laparotomy was performed. Group IS/REP: A 3- hour ischemia and 3-hour reperfusion were performed. Group IS/REP/NCER: The procedure included 3-hour ischemia, 3-hour reperfusion, and 20 µL (0.3 mmol/lit) of NCER 30 min before the cessation of ischemia. Significantly amended development of ischemia/reperfusion tissue injury was observed in animals treated with NCER compared to those of other groups (p = 0.001). Mean values of histomorphometric indices were significantly more improved than those observed for other groups (p = 0.001). Where testicular tissue is exposed to ischemia intraperitoneal administration of NCER could bear clinical benefits in diminishing ischemia-reperfusion injury.

This study examined the effect of Crataegus hydroalcoholic extract (CHE) on intestinal ischemia-reperfusion (I/R) in rats.

Experimental study Animals- 25 adult male Wistar rats Procedures- Rats weighing 200±25 g were randomly divided into five individual groups as follows: sham group without intestinal I/R, control group with intestinal I/R, and treatment groups with intestinal I/R and 10 days oral administration of CHE at doses of 25, 50 and 100 mg/kg. Intestinal I/R was accomplished by occlusion of the cranial mesenteric artery for 30 min, followed by 60 min reperfusion. Then tissue sections of jejunum were prepared and stained with hematoxylin-eosin. Histopathological lesions including hyperemia, hemorrhage, necrohemorrhagic inflammation, and villi destruction were scored as mild, moderate and severe. Results- In histopathologic evaluation, sham and control group showed the minimum and maximum injury, respectively. The mean scores of necrohemorrhagic inflammation and villi destruction significantly decreased in 25 mg/kg CHE group compared to control. However, hyperemia and hemorrhage did not change in comparison to control (p>0.007). In the group of 50 mg/kg CHE, no pathologic lesions were observed and the results were similar to those in the sham group. The mean scores of hyperemia and necrohemorrhagic inflammation in the 100 mg/kg CHE group had no significant difference with the control group. However, the mean rank of hemorrhage and villi destruction was significantly lower than control and higher than the sham group (p<0.007).

The findings of this study indicate that CHE at the dose of 50 mg/kg has the most protective effect against intestinal I/R injury in a rat model. Therefore, Crataegus can be a promising compound against intestinal I/R injuries.

The aim of the present study was to investigate the effects of curcumin nanoparticles (CNP) on stress oxidative following experimental ischemia-reperfusion injury in the rat testes.

Experimental Study Animals- Seventy-seven healthy male Wistar rats Procedures-The animals weighing approximately 250 g were randomly assigned to four experimental groups (n = 18): Ischemia: torsion group (created by 720° rotation of testis on both sides for 2 h). Ischemia/Reperfusion (I/R): torsion for 2 h followed distortion, CNP 10: received 10 mg/kg IP administration of CNP 30 min before surgery then remaining testes were twisted and untwisted, CNP 20: received 20 mg/kg IP administration of CNP 30 min before surgery then remaining testicles were twisted and untwisted. Unilateral orchiectomy of left or right testicles was performed on days 0 and 12 with immediately sampling. Some twisted then untwisted testicles were remained and sampled 60 days after surgery. An additional group was considered (n=5) to be sampled without any operation as control group. The samples of testicular tissue homogenates were taken on Days 0, 12 and 60, and their liquid extracts were collected and assayed for Superoxide dismutase (SOD), Malondialdehyde (MDA) and Glutathione peroxidase (GPX). The effect of treatment and day of sampling on the variables was analyzed using Two-Way ANOVA.

The results of the study showed an ameliorated balance of GPX, SOD and MDA following testicular torsion in this study. The CNP treated animals (with both administered doses) showed significantly improved the balance of the enzymes compared to untreated animals (p<0.0001). Conclusion and clinical relevance- In conclusion, IP administration of CNP may be helpful in minimizing oxidative stress related enzymes following testicular ischemia-reperfusion in rat.

Ovarian torsion must be diagnosed and treated as much early as possible. The aim of the present study was to investigate effects of interaperitoneal administration of curcumin on ischemia-reperfusion injury in ovaries. Design- Experimental Study  Twent-four healthy female Wistar rats Procedures- Twent-four healthy female Wistar rats weighing approximately 260g were randomized into four experimental groups (n = 6): Group Sham: The rats underwent only laparotomy. Group I: A 3- hour ischemia only. Group I/R: A 3-hour ischemia and a 3-hour reperfusion. Group I/R/C: A 3-hour ischemia, a 3-hour reperfusion and 1 mg/kg interaperitoneal administration of curcumin 2.5 hours after induction of ischemia. Curcumin treated animals showed significantly ameliorated development of ischemia and reperfusion tissue injury compared to those of other groups (P<0.05). The significant higher values of SOD, GPO and GST were observed in I/R/C animals compared to those of other groups (P<0.05). The damage indicators (MDA) was significantly lower in I/R/C animal compared to those of other groups (P<0.05). Interaperitoneal administration of curcumin could be helpful in minimizing ischemia-reperfusion injury in ovarian tissue exposed to ischemia.

Objective- This study investigated the effect of amlodipine on intestinal ischemia-reperfusion injury in rats
Design-Experimental study
Animals-Fifteen male Sprague-Dawly rats weighing 200-220g
Procedure- Rats were randomly divided into 3 groups: IR group (operation with clamping), sham group (operation without clamping), and IRA group (operation with clamping and 5mg/kg amlodipine pretreatment). Intestinal ischemia-reperfusion was performed by occlusion (clamping) of the arteria mesenterica anterior for 60 min, followed by 60 min reperfusion. Levels of superoxide dismutase (SOD), glutathione peroxidase (GPx) and malondialdehyde (MDA) were determined in intestinal tissue of rats. Intestinal tissues were also investigated histopathologically.
Results- Pretreatment with amlodipine impeded the increase in lipid peroxidation and mitigated GPx and SOD levels. Amlodipine also prevented I/R cellular damage and histological alternations in intestinal tissue. The levels of MDA (P<0.006) was significantly increased in the intestine of IR group rats. Intestinal GPx and SOD levels were decreased significantly (p<0.001) after I/R.
Conclusion and clinical relevance- The findings of this study suggest that amlodipine has a preventive activity on I/R-induced intestine injury. The observed preventive effects of amlodipine in the present study can possibly be mediated by means of its well-known antioxidant and anti-inflammatory potential. Therefore, we suggest that amlodipine may be a novel approach to therapy for protective intestinal I/R injury.