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PubMed2005

Altered chemokine response in an animal model of multiple organ dysfunction syndrome induced by zymosan.

PURPOSE: The aim of this study was to determine the monocyte chemoattractant protein-1 (MCP-1) response over time in an animal model of multiple organ dysfunction syndrome (MODS). METHODS: On day 0, rats were randomized to receive an intraperitoneal injection of zymosan at a dose of 1 mg/g of body weight (n = 36) or vehicle (n = 9). Serum, peritoneal lavage (PL) fluid, and bronchoalveolar lavage (BAL) fluid were collected from 3 rats in the control group and 6 to 7 rats in the zymosan group at days 1, 5, and 12. Monocyte chemoattractant protein-1 concentrations were determined by enzyme-linked immunosorbent assay. RESULTS: The authors observed a 47% mortality in the zymosan-treated rats. Monocyte chemoattractant protein-1 levels were unchanged in the serum, PL, and BAL of control animals. Both serum and PL MCP-1 were significantly higher in zymosan-treated rats on days 1 (P < .01) and 5 (P < .05) when compared with controls. By day 12, no difference between the 2 groups was observed. No significant difference was noted in BAL MCP-1. CONCLUSIONS: Chemokines are increased systemically and locally during MODS. The fact that MCP-1 is significantly higher early in the course of MODS may suggest that this chemokine is important in the early inflammatory changes that lead to MODS later in the course of this illness.

Animals↗
PubMed2006

TIMP-1/MMP-9 imbalance in brain edema in rats with fulminant hepatic failure.

BACKGROUND: Fulminant hepatic failure (FHF) is a devastating disease. When coma sets in, brain edema develops, changing FHF into a lethal condition. Liver transplantation is the definitive treatment. However, a third of these patients die as the result of brain edema before a donor becomes available. Tissue inhibitor of matrix metalloproteinase (MMP), or TIMP, and MMP-9 are implicated in ischemic brain edema. We thus hypothesized that an imbalance in TIMP-1/MMP-9 relationship plays a role in the development of increased brain extravasation and edema in FHF. MATERIALS AND METHODS: FHF was induced with a single intraperitoneal injection of D-galactosamine (250 mg/kg). Control rats received saline. GM6001, a synthetic MMP inhibitor, was administered (30 mg/kg) every 12 h for 3 doses starting at 12 h after D-galactosamine injection. MMP-9 was assayed with standard gelatin zymography. Brain extravasation, a measurement of the blood-brain barrier permeability, was determined with Evans blue. Brain edema was determined using specific gravity method. RESULTS: The active MMP-9 in the systemic circulation was significantly increased in the comatose FHF as compared to the precoma FHF and control animals (6.5 +/- 0.7 versus 4.6 +/- 0.4 versus 2.6 +/- 0.5 pg/microg, respectively; P < 0.05). Conversely, TIMP-1 was steadily decreased in precoma and coma FHF rats by 35% and 45%, respectively. Blocking MMP-9 activity with GM6001 significantly attenuated brain extravasation and edema in rats with FHF. CONCLUSIONS: Our study strongly supports that the perturbation of decreased TIMP-1 and increased MMP-9 contributes to the pathogenesis of brain edema in FHF. Our findings present a potential therapeutic approach to effectively increase the window of opportunity for life-saving liver transplantation.

Animals↗
PubMed2004

Acute oxidative stress induces peritoneal hyperpermeability, mesothelial loss, and fibrosis.

We explored the acute and long-term effects of short-lived, intense oxidative stress on peritoneal permeability and structure, induced with intraperitoneal injection of the oxidant agent deoxycholate, in rats. Ten minutes after the experimental intervention, peritoneal dialysis, performed over an exposure time of 60 minutes, revealed an increased urea dialysate/plasma ratio, greater glucose absorption, increased albumin losses in the effluent dialysate, and a reduced ultrafiltration rate. Mesothelial-cell imprints taken from the anterior liver surface indicated a substantially decreased density in the cell population. After the recovery period of 30 days, all alterations were still evident. Additionally, macroscopic and histologic observations made at this time interval detected peritoneal fibrosis and sclerosis, characterized by peritoneal adhesions, wrapping of intestinal loops, and the presence of a layer of fibrous tissue dressing the cavitary aspect of the liver peritoneal envelope. This report describes a reproducible experimental model of peritoneal fibrosis induced by acute oxidative injury. On the basis of these findings, it may be speculated that functional and structural alterations observed in patients are related to long-term continuous exposure of the monolayer to oxidative injury resulting from the high concentrations of d-glucose present in peritoneal dialysis solutions.

Acute Disease↗
PubMed2004

Inhibition of ischemia/reperfusion-induced damage by dexamethasone in isolated working rat hearts: the role of cytochrome c release.

We investigated the contribution of dexamethasone treatment on the recovery of postischemic cardiac function and the development of reperfusion-induced arrhythmias in ischemic/reperfused isolated rat hearts. Rats were treated with 2 mg/kg of intraperitoneal injection of dexamethasone, and 24 hours later, hearts were isolated according to the 'working' mode, perfused, and subjected to 30 min global ischemia followed by 120 min reperfusion. Cardiac function including heart rate, coronary flow, aortic flow, and left ventricular developed pressure were recorded. After 60 min and 120 min reperfusion, 2 mg/kg of dexamethasone significantly improved the postischemic recovery of aortic flow and left ventricular developed pressure from their control values of 10.7 +/- 0.3 ml/min and 10.5 +/- 0.3 kPa to 22.2 +/- 0.3 ml/min (p < 0.05) and 14.3 +/- 0.5 kPa (p < 0.05), 19.3 +/- 0.3 ml/min (p < 0.05) and 12.3 +/- 0.5 kPa (p < 0.05), respectively. Heart rate and coronary flow did not show a significant change in postischemic recovery after 60 or 120 min reperfusion. In rats treated with 0.5 mg/kg of actinomycin D injected i.v., one hour before the dexamethasone injection, suppressed the dexamethasone-induced cardiac protection. Electrocardiograms were monitored to determine the incidence of reperfusion-induced ventricular fibrillation. Dexamethasone pretreatment significantly reduces the occurrence of ventricular fibrillation. Cytochrome c release was also observed in the cytoplasm. The results suggest that the inhibition of cytochrome c release is involved in the dexamethasone-induced cardiac protection.

Animals↗
PubMed2005

Oxidative stress in heroin administered mice and natural antioxidants protection.

The oxidative stress of heroin administered mice via intraperitoneal injection, and the therapeutic effects of exogenous antioxidants on the restrain of the oxidative damage of biomolecules and withdrawal syndrome were studied. After administered with heroin, mice showed decrease of total antioxidant capacity in blood, increase of reactive oxygen species production in white blood cells, and increase of oxidative damages of protein and lipid in brain and liver, but not in heart. On the other hand, exogenous antioxidants could restrain the oxidative stress, even alleviate withdrawal syndrome.

Animals↗
PubMed2005

Intraperitoneal leptin regulates lipid metabolism in ethanol supplemented Mus musculas heart.

Diseases of the heart and blood vessels are a major cause of illness and disability worldwide. The relationship between ethanol consumption and cardiovascular disease are both complex and interconnected. Our aim of this study was to explore the effect of leptin on lipid metabolism in ethanol supplemented mice. Male Swiss mice (Mus musculas) weighing 25+/-2 g were administered ethanol (6.32 g kg(-1) body weight) for the first 30 days. Subsequently, ethanol fed mice were given intraperitoneal injections of exogenous mouse recombinant leptin (230 microg kg(-1) body weight) every alternate day for 15 days. Food and water intake and total body weight were measured every day and at the end of the experimental period of 45 days, plasma and cardiac lipids were analyzed. Exogenous leptin injections to ethanol fed mice significantly (P < 0.05) prevented the accumulation of total cholesterol, phospholipids (PL), triglycerides (TG) and free fatty acids (FFA) in the mouse heart and blood as compared to the untreated ethanol fed mice whereas, the plasma concentration of free cholesterol was significantly increased on leptin administration as compared to normal untreated mice. Moreover leptin administration significantly elevated the activities of cardiac lipoprotein lipase (LPL) and plasma lecithin cholesterol acyl transferase (LCAT) and significantly reduced the activities of cardiac HMG CoA reductase and cholesterol ester synthase (CES) on leptin administration to ethanol fed mice. Thus we could postulate that an increase in systemic leptin level prevents the accumulation of lipids in the plasma and heart of ethanol treated mice.

Animals↗
PubMed2005

Expression of glucocorticoid receptor in the intestine of a euryhaline teleost, the Mozambique tilapia (Oreochromis mossambicus): effect of seawater exposure and cortisol treatment.

Cortisol plays an important role in controlling intestinal water and ion transport in teleosts possibly through glucocorticoid receptor (GR) and/or mineralocorticoid receptor. To better understand the role of GR in the teleost intestine, in a euryhaline tilapia, Oreochromis mossambicus, we examined (1) the intestinal localizations of GR; (2) the effects of environmental salinity challenge and cortisol treatment on GR mRNA expression. The mRNA abundance of GR in the posterior intestinal region of tilapia was found to be higher than that in the anterior and middle intestine. In the posterior intestine, GR appears to be localized in the mucosal layer. GR mRNA levels in the posterior intestine were elevated after exposure of freshwater fish to seawater for 7 days following an increase in plasma cortisol. Similarly, cortisol implantation in freshwater tilapia for 7 days elevated the intestinal GR mRNA. These results indicate that seawater acclimation is accompanied by upregulation of GR mRNA abundance in intestinal tissue, possibly as a consequence of the elevation of cortisol levels. In contrast, a single intraperitoneal injection of cortisol into freshwater tilapia decreased intestinal GR mRNA. This downregulation of the GR mRNA by cortisol suggests a dual mode of autoregulation of GR expression by cortisol.

Animals↗
PubMed2005

Gene expression profiling in whole cerebral cortices of phencyclidine- or methamphetamine-treated rats.

Both phencyclidine (PCP) and methamphetamine (MAP) can cause schizophrenia-like symptoms. To identify the molecules relating to the drug-induced psychotic state, we used serial analysis of gene expression in rodent cerebral cortices isolated 1 h after intraperitoneal injection of saline, PCP (10 mg/kg), or MAP (4 mg/kg). We analyzed a total of 150,000 tags and found significantly up- or down-regulated genes. The number of MAP-, PCP-, and MAP and PCP-reactive tags were 229, 215, and 41, respectively.

Animals↗
PubMed2004

Induction of 8-hydroxydeoxyguanosine by man made vitreous fibres and crocidolite asbestos administered intraperitoneally in rats.

Inhaled fibres with certain physico-chemical properties are known to induce mesothelioma in humans. The induction of reactive oxygen (ROS) or nitrogen species (RNS) have been suggested as molecular mechanism of fibre induced carcinogenesis. In earlier studies we were able to demonstrate that crocidolite asbestos in vivo induces mutations in transgenic rats with a specific molecular spectrum that indicates the involvement of 8-hydroxydeoxyguanosine (8-OHdG) as pre-mutagenic adduct. 8-OHdG may be induced by primary (direct) and/or secondary (cellular mediated) mechanisms. Therefore, the induction of 8-OHdG as well as the inflammatory response of animals treated with fibre samples significantly differing in their physico-chemical characteristics was investigated. As appropriate system to study mesothelioma carcinogenesis, intraperitoneal injection in rats was used with samples of UICC crocidolite, crocidolite with reduced iron content, and a vitreous fibre (MMVF 11). Equal numbers of carcinogenic fibres from each sample revealed significant comparable increases in 8-OHdG induction. Parameters of inflammation (percentage of macrophages and TNF-alpha secretion) correlated significantly with the induction of 8-OHdG, 10 weeks after treatment.

8-Hydroxy-2'-Deoxyguanosine↗
PubMed2006

In vivo evaluation of induction of abnormal sperm morphology in mice by an unsaturated aldehyde crotonaldehyde.

Crotonaldehyde, a highly reactive unsaturated aldehyde is used for the manufacture of sorbic acid, synthesis of butyl alcohol, butylaldehyde, quinaldine, thiophenes, pyridines, dyes, pesticides, pharmaceuticals, rubber antioxidants, chemical warfare agents, etc. and also occurs naturally in meat, fish, in many fruits and vegetables, bread, cheese, milk, beer, wine and liquors. Human exposure to crotonaldehyde occurs from both man-made and natural sources. No human data was located describing carcinogenicity associated with crotonaldehyde exposure. In the present study we have evaluated whether or not exposure to crotonaldehyde results in a significant increase in the frequency of abnormal sperm heads in male Swiss albino mice. Adult male mice were treated with 8, 16 and 32 microl/kg b.w. of crotonaldehyde as a single intraperitoneal injection. The animals were killed 1, 3 and 5 weeks after treatment. Five animals were sacrificed per dose and time tested. Crotonaldehyde induced dose related increase in the percentage of abnormal sperm heads. Statistically significant increase in percentage of abnormal sperm heads was recoded at 16 and 32 microl/kg b.w. after 1 and 3 weeks of treatment and only at 32 microl/kg b.w. after 5 weeks of treatment.

Aldehydes↗
PubMed2005

Apoptosis inhibition in ischemic brain by intraperitoneal PTD-BIR3-RING (XIAP).

Anti-apoptotic treatment is a promising strategy for neuroprotection against various brain injuries resulting from ischemia or neuron degeneration. X-linked inhibitor of apoptosis protein (XIAP) is regarded as the most effective apoptosis inhibitor, in which C-terminal structure BIR3-RING mainly inhibits caspase-9-dependent apoptosis. In the present study, we fused XIAP (BIR3-RING) to the protein transduction domain (PTD) of antennapedia homeodomain of Drosophila (Antp HD), and then used the oxygen glucose deprivation (OGD)-induced hippocampal slices injury in vitro, and the rat transient middle cerebral artery ischemia (tMCAO) models in vivo, to explore the anti-apoptotic effect of this recombinant protein. The results showed that the PTD could efficiently mediate the transduction of BIR3-RING into the hippocampal slices and rat brains. PTD-BIR3-RING could decrease OGD-induced cell death in brain slices (p < 0.05). Intraperitoneal injection of PTD-BIR3-RING could attenuate terminal deoynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) positive cells and decrease cleaved caspase-3 in the ischemic bounder zone compared with the control animals (p < 0.05). Further studies showed that ischemia-induced neurological outcomes were improved in rats with PTD-BIR3-RING treatment (p < 0.05). These results demonstrate that PTD-BIR3-RING could attenuate cell death in OGD hippocampal slices and decrease cell apoptosis in tMCAO brains through inhibiting of caspase-3 cleavage, suggesting that PTD-mediated protein transduction provides a novel and effective approach for the therapies of brain diseases such as cerebral ischemia.

Animals↗
PubMed2005

Increase in hippocampal cell death after treatment with kainate in zinc deficiency.

Susceptibility to kainate-induced seizures is enhanced by zinc deficiency. To evaluate kainate-induced excitotoxicity in zinc deficiency, the relationship between kainate-induced seizures and hippocampal cell death was examined in control and zinc-deficient mice. Mice were fed a control and zinc-deficient diet for 4 weeks, and then intraperitoneally injected with 12 mg/kg kainate every 60 min three times. The rate of dead mice to the total mice was higher in zinc-deficient group than in control group 3 days after the last injection of kainate. In the survivals, which exhibited tonic convulsions in both control and zinc-deficient groups, kainate-induced hippocampal cell death was also analyzed by cresyl violet staining. Neuronal loss was more observed in the CA1, CA2 and CA3 pyramidal cell layers of zinc-deficient group than those of the control group. TUNEL-positive cells were significantly more detected in the CA1 and CA3 pyramidal cell layers of zinc-deficient group. These results demonstrate that kainate-induced hippocampal cell death occurs more easily in zinc deficiency. Extracellular zinc concentration detected with ZnAF-2 was significantly decreased in the hippocampal CA3 of zinc-deficient mice, in agreement with the previous data measured by in vivo microdialsysis. Synaptically released zinc may be less involved in kainate-induced hippocampal cell death in zinc deficiency.

Animals↗
PubMed2004

Ethanol impairs memory of a simple discrimination in adolescent rats at doses that leave adult memory unaffected.

Adolescent rats are less sensitive than adults to the hypothermic, anxiolytic, motor impairing, hypnotic, and lethal effects of ethanol. In vitro experiments nevertheless suggest that hippocampal neural activity is more affected by ethanol in preweanling or adolescent rats than in adults. These data are complemented by in vivo results showing that pretraining ethanol impairs learning in adolescent rats at doses that do not affect adult learning. In order to determine if posttraining ethanol affects memory differently in adolescents than in adults, Sprague-Dawley albino rats of both ages were trained in an appetitively motivated odor discrimination in which they were required to dig in scented sand for sweetened cereal reward. Immediately after training subjects received intraperitoneal injections of 0, 0.5, or 1g/kg ethanol (12.6%). At test, 48h later, subjects were presented with unbaited discriminanda and the time (s) spent digging in the S+ and S- was measured. Adolescents, but not adults, showed impaired discrimination performance if training was followed by ethanol. A subsequent experiment discounted the possibility that impaired adolescent performance was due to ethanol-induced conditioned taste or odor aversions. It thus appears that relative to adults, memory in adolescent rats is more strongly affected by ethanol in a test of appetitive conditioning that excludes ethanol's effects on sensory and motivational influences during the learning experience.

Aging↗
PubMed2006

Poloxamer 188 failed to prevent exercise-induced membrane breakdown in mdx skeletal muscle fibers.

We sought to determine the effectiveness of poloxamer 188 (P188) in protecting dystrophin-deficient, mdx skeletal muscle fiber membrane against exercise-induced breaches. mdx mice were treated with either P188 or placebo via intraperitoneal injections and run on a treadmill for 60-90 min. Membrane breakdown was quantified in cross-sections of rectus femoris muscle pretreated with Evans blue dye (in vivo). The mean % dye-penetrated muscle in the P188 and placebo groups was not significantly different in each of three trials. These results contrast with a recent report of P188 being highly effective in protecting the stretch- and dobutamine-stressed mdx heart muscle. The most likely explanations for the disparity are: (1) the exercise stress we used was beyond the protective range of P188, (2) P188 delivery and serum concentration were sub-optimal, or (3) the mdx skeletal myopathy and cardiomyopathy have fundamentally different responses to treatment.

Animals↗
PubMedDate not supplied

Prenatal methylazoxymethanol exposure alters evoked responses in fetal rats.

Although there is considerable interest in identifying methods to detect central nervous system impairment early in development, few behavioral assessment tools are available for detecting CNS deficits in the fetus. In the present study, methylazoxymethanol [MAM; Midwest Research Institute, (MRI)] was used to induce deficits in CNS development in fetal rats to assess effects on coordinated fetal behavior. Fetuses were exposed by administering MAM to pregnant rats on E17 of gestation via intraperitoneal injection and then were prepared for behavioral testing 3 days later on E20. After externalization from the uterus into a warm saline bath, fetal subjects received either an intraoral infusion of lemon extract to evoke a facial wiping response or were presented with an artificial nipple to evoke an oral grasping response. Interlimb coordination and paw-face contact during facial wiping were disrupted in MAM-exposed fetuses. Similarly, MAM exposure diminished the ability of fetuses to grasp or maintain oral contact with the artificial nipple. Although clear disruptions of movement coordination were seen in the MAM-treated subjects, there were no significant differences from saline controls in weight or anatomical measures. Together, these findings suggest that behavioral assessments of fetal motor coordination may be useful in identifying neural insult during prenatal development.

Analysis of Variance↗
PubMedDate not supplied

The distribution of cocaine in mice differs by age and strain.

Few studies have examined the influence of the age and the strain of mouse on the pharmacokinetics of psychostimulants, or the role of pharmacokinetics in age-related differences in drug responses. The present study compared concentrations of cocaine, and its metabolite, benzoylecgonine (BZE), in the blood and brain of early (P35) and later (P42) periadolescent and adult (P63) CD-1 and C57BL/6 male mice 15 min after acute intraperitoneal injection of cocaine (20 mg/kg). Brain levels of cocaine and BZE after seven daily cocaine injections in CD-1 and C57BL/6 mice beginning on P35 and on P63 were also measured. P35 periadolescents of both strains had lower blood cocaine levels than did the adults, but only C57BL/6 periadolescents had lower brain cocaine levels than the adults. C57BL/6 mice of both ages had higher blood cocaine levels than did the corresponding CD-1 mice. Concomitant with lower cocaine levels, periadolescent CD-1 mice had higher blood BZE levels than the adults, suggesting that periadolescents may metabolize cocaine faster. Brain cocaine levels in P42 C57BL/6 mice were similar to those of adults. Cocaine-induced activity did not differ between periadolescent and adult CD-1 mice after a single injection of cocaine, whereas periadolescent C57BL/6 mice had lower activity levels than did the adults after a single cocaine injection. Periadolescent CD-1 mice exhibited higher levels of locomotor activity following cocaine injection than did periadolescent C57BL/6 mice. Following chronic cocaine administration, cocaine and BZE levels in the brains of periadolescent and adult mice did not differ from each other in either strain. However, brain cocaine levels at both ages were lower in CD-1 mice than in C57BL/6 mice. In conclusion, the age and the strain of mouse significantly affect the levels of cocaine obtained in brain and blood following acute administration. Our data are consistent with the notion that CD-1 and C57BL/6 mice metabolize cocaine faster during the early periadolescent period than as adults. Furthermore, potentially important strain differences between CD-1 and C57BL/6 mice were noted in cocaine levels following acute and chronic cocaine administration, and in locomotor activity following acute cocaine administration.

Age Factors↗
PubMed2006

Protective effect of alpha-lipoic acid in experimental spermatic cord torsion.

OBJECTIVE: We investigated the effect of alpha-lipoic acid (LA) in rats that were subjected to torsion/detorsion of the spermatic cord in a comparative controlled experiment. METHODS: Forty-eight male Wistar rats, randomized in two groups, received intraperitoneal injections of LA (LA group; aqueous solution at 36 mg/kg of body weight per day) or equal volume of saline (control group) 21, 9, and 1 h before torsion of the spermatic cord. Rats in each group were distributed in four subgroups, each comprising six animals. All surgical procedures were performed under inhaled ether anesthesia. Ischemia was induced by 720-degree torsion of the spermatic cord for 3 h. The right testis was assessed through longitudinal scrotal incision. After each surgical procedure, scrotal incisions were closed with 4-0 nylon monofilament. Ipsilateral testes and arterial blood samples were collected at the end of ischemia and 1, 3, and 6 h after detorsion. Thiobarbituric acid-reactive substances and reduced glutathione levels (micromoles per gram of wet tissue) were assayed in testis. Total antioxidant power was measured in blood plasma. RESULTS: LA pretreatment promoted a significant decrease in testicular concentrations of thiobarbituric acid-reactive substances and simultaneously induced an increase in reduced glutathione concentrations at all time points studied. Plasma total antioxidant power levels increased significantly during reperfusion (T-1) in LA-treated rats compared with control rats. CONCLUSION: LA administered before torsion of the spermatic cord showed significant protective effects against ischemia/reperfusion injury by decreasing lipid peroxidation and regulating testicular reduced glutathione and plasma total antioxidant power levels.

Animals↗
PubMed2004

Erythropoietin improves place learning in fimbria-fornix-transected rats and modifies the search pattern of normal rats.

The acquisition of a water-maze-based allocentric place learning task was studied in four groups of rats: two groups subjected to bilateral transections of the fimbria-fornix and two groups undergoing a sham control operation. At the moment of surgery all animals were given one systemic (intraperitoneal) injection of either human recombinant erythropoietin (EPO) (at a dosage of 5000 IU/kg body weight), given to one of the fimbria-fornix-transected groups and one of the sham-operated groups, or vehicle (saline), given to the two remaining groups. The 25-day task acquisition period (one session/day) began 6 or 7 days after the day of surgery. The fimbria-fornix-transected and saline-injected group exhibited a pronounced and long-lasting impairment of task acquisition. In contrast, the fimbria-fornix-transected and EPO-treated group demonstrated a less pronounced and more transient lesion-associated impairment. The two sham-operated groups did not differ with respect to the proficiency of task acquisition. But administration of EPO to intact animals caused a significant modification of swim patterns-apparently reflecting a somewhat modified strategy of task solution. It is concluded that systemic administration of EPO significantly improves the posttraumatic functional recovery of the presently studied place learning task after transections of the fimbria-fornix. Additionally, administration of EPO influences the strategy, although not quality, of task solution in normal (sham-operated) rats.

Animals↗