[Show abstract][Hide abstract] ABSTRACT: In a search of peripheral factors that could be responsible for the discrepancy in susceptibility to EAE in Albino Oxford (AO) and Dark Agouti (DA) rats, we estimated the expression of metallothioneins I/II (MT), heat shock protein-gp96, interleukin (IL)-6, and transforming growth factor (TGF)- β in the livers of these animals. Rats were immunized with bovine brain homogenate (BBH) emulsified in complete Freund adjuvant (CFA) or only with CFA. Western blot and immunohistochemical analyses were done on day 12 after the immunization, as well as in intact rats. The data have shown that during the first attack of EAE only the EAE prone-DA rats markedly upregulated the hepatic MTs, gp96, IL-6, and TGF- β . In contrast, AO rats had a significantly higher expression of MT I/II, IL-6, and TGF- β in intact liver (P < 0,001), suggesting that the greater constitutive expression of these proteins contributed to the resistance of EAE. Besides, since previously we found that AO rats reacted on immunization by an early upregulation of TGF- β on several hepatic structures (vascular endothelium, Kupffer cells, and hepatocytes), the data suggest that the specific hepatic microenvironment might contribute also to the faster recovery of these rats from EAE.
[Show abstract][Hide abstract] ABSTRACT: In the present laboratory study, persistence of imidacloprid (IMI) as a function of initial insecticide concentration and soil properties in two Croatian soils (Krk sandy clay and Istria clay soils) was studied and described mathematically. Upon fitting the obtained experimental data for the higher concentration level (5 mg/kg) to mathematical models, statistical parameters (R (2), scaled root mean squared error and χ (2) error) indicated that the single first-order kinetics model provided the best prediction of IMI degradation in the Krk sandy clay soil, while in the Istria clay soil biphasic degradation was observed. At the lower concentration level (0.5 mg/kg), the biphasic models Gustafson and Holden models as well as the first-order double exponential model fitted the best experimental data in both soils. The disappearance time (DT50) values estimated by the single first-order double exponential model (from 50 to 132 days) proved that IMI can be categorized as a moderately persistent pesticide. In the Krk sandy clay soil, resulting DT50 values tended to increase with an increase of initial IMI concentration, while in the Istria clay soil, IMI persistence did not depend on the concentration. Organic matter of both experimental soils provided an accelerating effect on the degradation rate. The logistic model demonstrated that the effect of microbial activity was not the most important parameter for the biodegradation of IMI in the Istria clay soil, where IMI degradation could be dominated by chemical processes, such as chemical hydrolysis. The results pointed that mathematical modeling could be considered as the most convenient tool for predicting IMI persistence and contributes to the establishment of adequate monitoring of IMI residues in contaminated soil. Furthermore, IMI usage should be strictly controlled, especially in soils with low organic matter content where the risk of soil and groundwater contamination is much higher due to its longer persistence and consequent leaching and/or moving from soil surface prior to its degradation.
Journal of Environmental Science and Health Part B Pesticides Food Contaminants and Agricultural Wastes 11/2013; 48(11):906-18. DOI:10.1080/03601234.2013.816561 · 1.20 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To investigate the effects of air pollution related with the gasoline/petrochemical industry the expression of metallothionein I (MT-I) mRNA and tissue metals were analyzed in organs of mice, exposed to gasoline (G) vapor in laboratory conditions. Control groups consisted of intact mice and of those exposed in the metabolic chamber to fresh air. The data obtained by RT-PCR and inductively coupled plasma spectrometry have shown that exposure to G vapor leads to upregulation of MT-I mRNA in organs that receive a strong respiratory and olfactory input or participate in gasoline degradation and elimination (lungs, brain, kidney and liver). Besides, in the brain and in the lungs, kidney and liver a decreased tissue content of Zn²⁺ or Cu²⁺ and Mg²⁺ was found (p⟨0.001). Some of these changes were obtained also in mice closed in the metabolic chamber, pointing to the involvement of stress-induced mechanisms in the transcriptional regulation of MTs.
Histology and histopathology 09/2013; 29(3). · 2.10 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to analyze and evaluate risks of long-term exposure to mercury in hares (Lepus europaeus Pallas), with a chemical-analytical approach evaluating median mass fraction of toxic mercury in the hares organs (liver, kidney, muscle and brain). To obtain better insight into possible effects of mercury, the study included screening of the oxidative status after long term exposure to low concentrations of mercury. Hares organs were analyzed for total mercury concentration by AAS. Glutathione and glutathione-dependent enzymes status was also investigated. The median mercury concentrations (wet weight) in the liver, kidney, muscle and brain of the hares ranged from 0.058-0.189, 0.138-0.406, 0.013-0.046 and 0.022-0.102 μg/g respectively. Concentration of the glutathione (GSH), glutathione-peroxidase (GPx), and glutathione-reductase (GR) activity increased with the mercury concentration. However, glutathione S-transferase (GST) and superoxide-dismutase (SOD) activity decreased with the mercury concentration. The results of this study show the impact of environmentally absorbed mercury on the antioxidant status of the examined hares. Further research on long-term exposure to low concentrations of mercury is needed.
Journal of Environmental Science and Health Part A Toxic/Hazardous Substances & Environmental Engineering 09/2013; 48(11):1325-1332. DOI:10.1080/10934529.2013.781869 · 1.16 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Abstract Environmental impact of natural gas facility near Molve (Podravina, Croatia) was assessed using hares (Lepus europaeus Pallas) as biomonitors. Elevated levels of heavy metals in the environment lead to their accumulation in different tissues of hares. We have tested accumulation and distribution of several metals in hares liver, kidney and muscle tissue. The accumulation of copper in hares liver and kidneys with concomitant decrease of zinc was observed in animals from Podravina region as opposed to control group of animals (Island Krk, Croatia). Secondly, the expression of metallothioneins was assessed because of their crucial role in metal homeostasis. Observed elevation of metallothionein expression in tested organs emphasizes the possible prolonged negative effects of heavy metals in the surroundings as well as a state of oxidative stress in animals. Further monitoring of the area is necessary for better control of hydrocarbon processing to diminish the possible negative environmental effects.
Archives of Environmental and Occupational Health 05/2013; 70(3). DOI:10.1080/19338244.2013.787966 · 0.93 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Influence of cadmium on metallothionein expression and products of lipid peroxidation
in the organs of hares (Lepus europaeusPallas)
Cadmium occurs naturally in the environment and as an anthropogenic pollutant. Exposure to low concentrations of cadmium is inevitable and may produce toxic effects. Another important aspect of cadmium toxicity is its interaction, often antagonistic, with essential elements such as selenium. The aim of this study was to highlight the risks of long-term exposure to low cadmium concentrations, using a scientific and chemical approach and hares (Lepus europaeusPallas) as model organisms in a field study. Two study areas were monitored. Levels of cadmium and selenium were quantified in the organs of hares, the expression of metallothioneins I + II and the products of lipid peroxidation were determined. The median cadmium concentrations (wet weight) in the muscle, liver, kidney and brain of hares from an exposed group ranged from 0.033 to 0.037, 0.763 to 1.054, 3.090 to 16.594 and 0.016 to 0.087mgg�1 , respectively; whereas, the median selenium concentrations
(wet weight) ranged from 0.100 to 0.108, 0.153 to 0.332, 0.677 to 0.701 and 0.078 to 0.116mgg �1 , respectively. Expression of the metallothioneins I + II proteins was observed in tissues. Lipid peroxidation (LPO) levels, measured as malondialdehyde (MDA) equivalents, increased with the cadmium concentration. Further research on long-term exposure to low concentrations of cadmium in the environment is needed.
Journal of Applied Toxicology 04/2013; DOI:10.1002/jat.2880. · 2.98 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Objectives: Compared to the Dark Agouti (DA), the Albino Oxford (AO) rat strain
exhibits lower susceptibility to the induction of experimental autoimmune
encephalomyelitis (EAE). Here, we investigated the potential contribution of the
heavy metal-binding proteins metallothioneins (MTs) I/II to these effects.
Methods: Rats were immunized with bovine brain homogenate emulsified in complete
Freund's adjuvant or only with complete Freund's adjuvant. The expression
patterns of MTs mRNA and proteins and tissue concentrations of Zn(2+) and Cu(2+)
were estimated in the brain and in the liver on days 7 and 12 after immunization,
by real-time PCR, immunohistochemistry and inductively coupled plasma
spectrometry, respectively. Additionally, the hepatic transforming growth factor
beta and nuclear factor kappa B immunoreactivities were tested. Results: Clinical
signs of EAE were not induced in AO rats, but they upregulated the expression of
MT I/II proteins in the brain (hippocampus and cerebellum) and in the liver,
similarly as DA rats. The transcriptional activation of MT-I occurred, however,
only in DA rats, which accumulated also more zinc in the brain and in the liver.
In contrast, intact AO rats had greater hepatic MT-I mRNA immunoreactivity and
more Cu(2+) in the hippocampus. Besides, in immunized AO rats a high upregulation
of transforming growth factor beta and nuclear factor kappa B immunoreactivities
was found in several hepatic structures (vascular endothelium, Kupffer cells and
hepatocytes). Conclusions: Our data show that AO and DA rats differ in
constitutive and inductive MT-I gene expression in the brain and in the liver, as
well as in the hepatic cytokine profile, suggesting that these mechanisms may
contribute to the discrepancy in the susceptibility to EAE.
[Show abstract][Hide abstract] ABSTRACT: Objectives:
Compared to the Dark Agouti (DA), the Albino Oxford (AO) rat strain exhibits lower susceptibility to the induction of experimental autoimmune encephalomyelitis (EAE). Here, we investigated the potential contribution of the heavy metal-binding proteins metallothioneins (MTs) I/II to these effects.
Rats were immunized with bovine brain homogenate emulsified in complete Freund's adjuvant or only with complete Freund's adjuvant. The expression patterns of MTs mRNA and proteins and tissue concentrations of Zn2+ and Cu2+ were estimated in the brain and in the liver on days 7 and 12 after immunization, by real-time PCR, immunohistochemistry and inductively coupled plasma spectrometry, respectively. Additionally, the hepatic transforming growth factor beta and nuclear factor kappa B immunoreactivities were tested.
Clinical signs of EAE were not induced in AO rats, but they upregulated the expression of MT I/II proteins in the brain (hippocampus and cerebellum) and in the liver, similarly as DA rats. The transcriptional activation of MT-I occurred, however, only in DA rats, which accumulated also more zinc in the brain and in the liver. In contrast, intact AO rats had greater hepatic MT-I mRNA immunoreactivity and more Cu2+ in the hippocampus. Besides, in immunized AO rats a high upregulation of transforming growth factor beta and nuclear factor kappa B immunoreactivities was found in several hepatic structures (vascular endothelium, Kupffer cells and hepatocytes).
Our data show that AO and DA rats differ in constitutive and inductive MT-I gene expression in the brain and in the liver, as well as in the hepatic cytokine profile, suggesting that these mechanisms may contribute to the discrepancy in the susceptibility to EAE.
[Show abstract][Hide abstract] ABSTRACT: Metallothioneins (MTs) are small, cysteine-rich proteins which have been implicated in various forms of stress providing cytoprotective action against oxidative injury, DNA damage and apoptosis. Owing to their high affinity for physiological metals, such as zinc and copper MTs are also critical components of regulatory proteins involved in cell growth and multiplication, as well as in the maintenance of immune homeostasis. To elucidate the role of MTs in the pathomechanisms of autoimmune CNS disorders we estimated the expression of MT I+II proteins and the content of free Zn ions in the brain, spinal cord and in the liver early in the course of chronic relapsing experimental autoimmune encephalomyelitis (CR-EAE) pathogenesis, i.e. before the onset of any clinical symptoms. Disease was induced in the genetically susceptible Dark Agouti (DA) rats by subcutaneous injection of bovine brain homogenate in CFA. Control animals were treated with CFA alone. The data, obtained by immuno-histochemistry and in situ fluorescent labeling of free zinc ions, have shown that in the presymptomatic phase of CR-EAE (on the seventh postimmunization day) MTs I+II were markedly upregulated in the cells that form blood-brain and blood-cerebrospinal fluid barriers, as well as in the cerebellar parenchyma and hippocampal dentate gyri. Furthermore, we found that the liver also becomes a site of extensive MTs I+II synthesis shortly after immunization. Simultaneously, tissue content of free zinc ions increased at the sites of MTs induction, reflecting their antioxidative activity. The data, described in this paper point to regulatory and neuroprotective role of MTs in the pathogenesis of CR-EAE.
Current Aging Science 02/2013; 6(1):37-44. DOI:10.2174/1874609811306010006
[Show abstract][Hide abstract] ABSTRACT: Sorption-desorption behavior of imidacloprid in six soils collected from five coastal regions in Croatia at 20, 30 and 40°C was investigated using batch equilibrium technique. Isothermal data were applied to Freundlich, Langmuir and Temkin equations, and the thermodynamic parameters ΔH°, ΔG°, ΔS° were calculated. The sorption isotherm curves were non-linear and may be classified as L-type, suggesting a relatively high sorption capacity for imidacloprid. Our results showed that the K( sor ) ( F ) values decreased for all the tested soils as the temperature increased, indicating that the temperature strongly influences the sorption. Values of ΔG° were negative (-4.65 to -2.00 kJ/mol) indicating that at all experimental temperatures the interactions of imidacloprid with soils were spontaneous processes. The negative and small ΔH° values (-19.79 to -8.89 kJ/mol) were in the range of weak forces, such as H-bonds, consistent with interactions and partitioning of the imidacloprid molecules into soil organic matter. The ΔS° values followed the range of -57.12 to -14.51 J/molK, suggesting that imidacloprid molecules lose entropy during transition from the solution phase to soil surface. It was found that imidacloprid desorption from soil was concentration and temperature-dependent, i.e. at lower imidacloprid concentrations and temperature, lower desorption percentage occurred. Desorption studies revealed that hysteretic behavior under different temperature treatments existed, and it was more pronounced at 20°C in the soils with higher OC content. The study results emphasize the importance of thermodynamic parameters in controlling soil pesticide mobility in different geographical locations, seasons and greenhouse conditions.
Journal of Environmental Science and Health Part B Pesticides Food Contaminants and Agricultural Wastes 09/2012; 47(8):779-94. DOI:10.1080/03601234.2012.676413 · 1.20 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We examined the effect of dietary fats on the kinetics of liver regeneration after one-third partial hepatectomy (PH) in male Balb/c mice. Corn and olive supplemented diets were chosen as a model of n-6 and n-9 diets. Phospholipid fatty acids were determined by gas chromatography (GC) after previous fractionation by solid-phase extraction using amino-propyl (NH 2) column, and data were analysed by nonparametric Kruskal-Wallis test. Diet enriched with corn and olive oil did not affect the balance of lipid disorders during liver regeneration after 1/3 PH. Desaturases activity direction has changed depending on the used diet. The key role in the alteration of the polar fatty acids profile at all stages of liver regeneration and examined dietary fats is played by activity of stearoyl-CoA desaturase (SCD).
Food and Nutrition Sciences 01/2012; 03(02). DOI:10.4236/fns.2012.32035
[Show abstract][Hide abstract] ABSTRACT: To elucidate the role of metallothioneins (MTs) in the pathomechanisms of autoimmune CNS disorders we estimated the expression of MTs I+II and the tissue concentrations of Zn²+ and Cu²+ in the brain, spinal cord (SC) and in the liver during the periods of attacks and remissions in chronic relapsing experimental autoimmune encephalomyelitis (CR-EAE). Disease was induced in the genetically susceptible Dark Agouti (DA) rats by subcutaneous injection of bovine brain homogenate in CFA. Control rats were treated with CFA. The data, obtained by clinical assessment, immunohistochemistry and inductivity coupled plasma spectrometry, have shown that during the first attack (on the 12th day) MTs I+II were markedly upregulated in subarachnoid regions and perivascular space on astrocytes, microglia and on spinal neurons. Simultaneously, the concentrations of zinc in the SC and zinc and copper in the liver have found to be increased. During the second attack (on the 22nd day) a new overexpression of MTs was found in the cerebellum, in sulcus hippocampi, in spinal neurons and particularly in hepatocytes around the central vein. Concomitantly, in the brain and SC the concentration of copper increased. The data point to a neuroprotective role of MTs and to an important regulatory role of essential metals and hepatic MTs in the pathogenesis of CR-EAE.
Histology and histopathology 02/2011; 26(2):233-45. · 2.10 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to investigate the influence of olive oil (00) enriched diet on the lipid content of mice brain during the early phase of liver regeneration and to test a relationship of these changes with calcium content. C57BI mice were fed over 21 days with diet enriched with olive oil, containing predominantly oleic acid (18:1n-9). The animals were one-third partially hepatectomised (pHx) under aether anaesthesia. Total lipids were extracted from tissue samples with a chloroform-methanol (2:1, v/v) mixture according to Folch et al. Mineral concentration was determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES) after microwave brain tissue digestion. The diet containing 00 increased both total lipid content and the calcium concentration in brain during the early phase of liver regeneration (12hrs post pHx), suggesting that monounsaturated oleic acid might interact with some metal-dependent activities that control changes in the brain during liver regeneration.
Collegium antropologicum 01/2011; 35 Suppl 1:85-91. · 0.61 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Carbon tetrachloride (CCl(4)) is a well-known model compound for producing chemical hepatic injury. This study investigated the protective effects of the flavonoid luteolin on the CCl(4)-induced hepatotoxicity in mice. Luteolin dissolved in dimethyl sulfoxide (DMSO) was administered intraperitoneally (i.p.) at 5 or 50 mg/kg as a single dose, and once daily for 2 consecutive days. Two hours after the final treatment, the mice were treated with CCl(4) (20 mg/kg, i.p.). CCl(4)-induced hepatotoxicity was reduced in a dose- and time-dependent manner, as determined by decreased serum aminotransferase activities and liver histopathology. CCl(4) intoxication resulted in an overexpression of heat shock protein gp96 in the mice liver, which was strongly attenuated by luteolin pretreatment. Luteolin has also decreased oxidative stress produced by CCl(4), as suggested by improvement in the Cu/Zn superoxide dismutase activity. The effect of luteolin on myeloperoxidase, an indicator of inflammatory cell infiltration, was also investigated. Treatment of the mice with luteolin resulted in a significant decrease in the myeloperoxidase activity. The hepatoprotective effect of luteolin against CCl(4) hepatotoxicity was higher in animals pretreated with luteolin for 2 consecutive days. This suggests that the protection might be due to induction of some adaptive mechanisms. The data indicate that luteolin could be effective in protecting mice from the hepatotoxicity produced by CCl(4).
Experimental and toxicologic pathology: official journal of the Gesellschaft fur Toxikologische Pathologie 02/2009; 61(6):581-9. DOI:10.1016/j.etp.2008.12.005 · 1.86 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to investigate the protective effect of luteolin on liver Ca, Mg, Zn, Cu, Fe, and Mn content in mice with carbon tetrachloride (CCl4)-induced hepatotoxicity. Additionally, liver metallothionein (MT) expression was studied. Luteolin was administered intraperitoneally (i.p.) as a single 5- or 50-mg/kg dose or once daily for two consecutive days, respectively. Two hours after the last injection, the mice were treated with CCl4 (20 mg/kg, i.p.). CCl4 injection reduced hepatic level of all metals except Ca, with an intense cytoplasmic staining pattern in hepatocytes located in periportal areas, indicating induction of MTs. Pretreatment with 50 mg/kg of luteolin for 2 days remarkably elevated metal content to control values (Mg and Cu) or even above them (Zn and Fe). Luteolin pretreatment increased pericentral MTs immunopositivity and histological architecture improvement in a time- and dose-dependent manner, being the most prominent in mice pretreated with 50 mg/kg for 2 days. The liver in this group showed pronounced MT expression in almost all hepatocytes throughout the liver parenchyma. In conclusion, these results suggest the protective effect of luteolin on CCl4-induced hepatotoxicity and an enhancement of hepatocyte proliferative capabilities.
Biological trace element research 12/2008; 126(1-3):176-85. DOI:10.1007/s12011-008-8181-0 · 1.75 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The influence of dietary fats on cellular alpha-tocopherol and retinol uptake in iron overload is poorly understood. The aim of this study was to investigate the effect of a high-iron diet on the retinol and alpha-tocopherol levels in mice fed olive oil- and corn oil-enriched diets. Mice were fed for 3 weeks a standard mouse chow (the control group) and diets enriched with 5% by weight of corn oil or olive oil. Diets of the mice fed corn oil and olive oil were additionally supplemented with 1% by weight carbonyl iron. Both dietary oils and iron increased the liver iron uptake. High-iron feeding induced oxidative stress in mice liver, measured as a thiobarbituric acid-reactive substance level. Both fats and iron induced changes in the liver fatty acid composition. Liver retinol and alpha-tocopherol stores increased with iron supplementation in the olive oil-enriched diet, with a simultaneous decrease in serum. The results suggest that the influx of alpha-tocopherol and retinol from serum to the liver is induced by high dietary iron. This redistribution appears to be stronger for retinol than for alpha-tocopherol and is also higher in mice fed olive oil than in mice fed corn oil, suggesting that the composition of dietary lipids is important in the treatment of high-iron tissue conditions. In conclusion, the results of this study suggest that the increase of hepatic alpha-tocopherol and retinol levels in the olive oil-based diet is a dietary-dependent responsive mechanism that probably is not primarily related to an increased risk of oxidative damage induced by high-iron intake.
Nutrition research 05/2008; 28(4):263-9. DOI:10.1016/j.nutres.2008.01.007 · 2.47 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Professor Eugen Cerkovnikov, PhD (Kamenska, Russia, 1904- Rijeka, Croatia 1985) graduated in chemical technology from the Faculty of Engineering in Zagreb in 1929. His first job was at the School of Medicine in Paris in 1930, and then he moved to Zagreb to the Department of Organic Chemistry of the Faculty of Engineering run by our Nobel Prize winner Vladimir Prelog (1935-1938). There he took his PhD degree with a dissertation on piperidine gamma derivatives. From 1938 to 1947 he was a research associate at an institute established by the pharmaceutical company Kastel (later Pliva). This is when he became a lecturer at the Faculty of Pharmacy in Zagreb and the first director of the Institute of Organic Chemistry, established in 1946/47. In 1948 he became reader, and in 1956 (full) professor. In 1957 he moved to the newly established School of Medicine in Rijeka, and set up the Institute of Chemistry and Biochemistry. He ran the Institute until retirement in 1975. He was the second dean of the Rijeka University School of Medicine and a pioneer of quantum chemistry and medical cybernetics in undergraduate and (post)graduate courses. His scientific work consists of over 200 papers published at home and abroad, 60 professional papers, 20 book reviews, three works of translation, and 27 volumes of lecture notes. In 1958, professor Cerkovnikov established the Croatian Chemical Society and the Rijeka and Istria branches of the nation's Association of Chemists and Chemical Engineers, chairing them until 1974. In addition, he was one of the founding fathers, and the first chair of the Health Culture Studies Association in Rijeka (that preceded today's Croatian Scientific Society for the History of Health Culture), established in 1965.
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to analyze the effect of high dietary Fe on liver antioxidant status in mice fed a corn-oil-enriched diet. Male Balb/c mice were fed for 3 wk with a standard diet enriched with 5% by weight of corn oil with adequate Fe (FCO diet) or supplemented with 1% carbonyl Fe (FCOFe diet). The control group was fed a standard diet. The high-Fe diet induced a twofold increase of hepatic Fe level. However, an increase of thymic Fe level has been induced solely by dietary fat. The hepatic copper (Cu) level slightly decreased in the FCO diet. In the spleen, the high-Fe diet-induced increase of Fe level was negatively correlated with the Cu level. The antioxidant status was influenced by both dietary fat and Fe. Mice fed corn-oil-enriched diets had a higher concentration of thiobarbituric acid-reactive substances (TBARS), with a greater increase in the FCOFe diet. Fatty acid analysis showed decreased n-3 and n-6/n-3 ratio, particularly in the FCOFe diet. Hepatic Cu/Zn superoxide dismutase (CuZn-SOD) activity was decreased in FCO diet, and Fe supplementation caused a further decrease in the enzyme activity. These results suggest that feeding with corn oil-enriched diet increases oxidative damage by decreasing antioxidant enzyme defense. The high-Fe diet additionally affects the antioxidant defense system, further increasing the tissue's susceptibility to lipid peroxidation. Additionally, both corn-oil- and Fe-enriched diets have increased the Cu requirement in mice.
Biological Trace Element Research 12/2006; 113(2):177-91. DOI:10.1385/BTER:113:2:177 · 1.75 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The purpose of this study was to explore the effect of dietary fats on the hepatic fatty acid profile of mice liver after partial hepatectomy and to observe a correlation with changes in element content. Male Balb/C mice were divided into three groups: the control animals fed a standard diet (FSD), the FOO group fed a diet enriched with 5% olive oil, and the FCO group fed a diet enriched with 5% corn oil. Hepatic fatty acid and element content were analyzed within each group in intact animals and on d 1, 2, and 7 after partial hepatectomy. During the regenerative process, proportions of 18:1n-9 and 18:3n-6 substantially increased in the FSD diet, correlating with the Zn level. On the other hand, 20:4n-6 and 22:6n-3 decreased on d 1 and 2. Consequently, a significant increase in the n-6: n-3 ratio was found in these animals. In the FOO diet, a decreased polyunsaturated fatty acid/monounsaturated fatty acid (PUFA/MUFA) ratio was related to a significant decrease in PUFA content, mainly the result of decreased 20:3n-6 and 20:4n-6. The proportion of 18:1n-9 was highly increased when compared with other diets and remained high during the regeneration. Furthermore, the n-6: n-3 ratio was increased on d 2 and 7. Zn increased on d 1 and 2, and Fe increased on d 2. Feeding with corn oil generally induced an increase in the PUFA n-6 series, compared with other diets. The PUFA n-3 series decreased and the 18:1n-9 increased on d 1, compared to intact animals. Consequently, the n-6: n-3 ratio was elevated during the regeneration. Zn increased on d 1 and 2, whereas Fe remained unchanged until d 7, when it decreased. Decreased 20:4n-6 on d 1 and 2, as well as Cu on d 7, and increased Zn in the first 2 d were common to all three diets. These findings suggest that some significant signals transmitted during the regenerative process have induced alterations in the fatty acid composition and changes in the liver element content, which can be modified by the diet.
Biological Trace Element Research 02/2006; 109(1):61-74. DOI:10.1385/BTER:109:1:061 · 1.75 Impact Factor