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1.
Monica Daniela Doşa Laurentiu-Tony Hangan Eduard Crauciuc Cristina Galeş Mihai Nechifor 《Biological trace element research》2011,142(1):36-46
Research was performed on a group of 30 patients with non-insulin-dependent diabetes mellitus (NIDDM), who never received
antidiabetic medication before, and on a group of 17 healthy adults. The patients were administered treatment with metformin,
1,000 mg/day. Plasmatic and urinary concentration of magnesium have been measured, copper and zinc along with the concentrations
of glucose, HDL, LDL, cholesterol, tryglicerides, HbA1c, and total erythrocyte magnesium, in advance and after 3 months of
treatment. Data showed significant differences in the NIDDM group vs the control group: for plasma magnesium—1.95 ± 0.19 vs
2.20 ± 0.18 mg/dl, p < 0.001; urine magnesium—237.28 ± 34.51 vs 126.25 ± 38.22 mg/24 h, p < 0.001; erythrocyte magnesium—5.09 ± 0.63 vs 6.38 ± 0.75 mg/dl, p < 0.001; plasma zinc—67.56 ± 6.21 vs 98.41 ± 20.47 μg/dl, p < 0.001; urine zinc—1,347.54 ± 158.24 vs 851.65 ± 209.75 μg/24 h, p < 0.001; plasma copper—111.91 ± 20.98 vs 96.33 ± 8.56 μg/dl, p < 0.001; and urine copper—51.70 ± 23.79 vs 36.00 ± 11.70 μg/24 h, p < 0.05. Treatment with metformin for 3 months modified significant erythrocyte magnesium—5.75 ± 0.61 vs 5.09 ± 0.63 mg/dl,
p < 0.001 and urine magnesium—198.27 ± 27.07 vs 237.28 ± 34.51 mg/24 h, p < 0.001, whereas it did not modify significant the plasmatic and urinary concentration of the other cations. The erythrocyte
magnesium concentration was inversely correlated with HbA1c (r = −0.438, p = 0.015). The plasma level of copper was positively correlated with HbA1c (r = 0.517, p < 0.003), tryglicerides (r = 0.534, p < 0.003), and cholesterol (r = 0.440, p < 0.05), and the plasma level of zinc was inversely correlated with glycemia (r = −0.399, p = 0.029). Our data show a significant action of metformin therapy, by increasing the total intraerythrocyte magnesium concentration
and decreasing the urinary magnesium elimination, positively correlated with the decrease of glycemia and HbA1c in NIDDM patients. 相似文献
2.
Suresh K. Gupta Vivekananthan Kalaiselvan Sushma Srivastava Rohit Saxena Shyam S. Agrawal 《Biological trace element research》2010,136(3):258-268
Cataract is the opacification in eye lens and leads to 50% of blindness worldwide. The present study was undertaken to evaluate
the anticataract potential of Trigonella foenum-graecum Linn seeds (fenugreek) in selenite-induced in vitro and in vivo cataract. In vitro enucleated rat lenses were maintained
in organ culture containing Dulbecco’s modified Eagles medium (DMEM) alone or in addition with 100 μM selenite and served
as the normal and control groups, respectively. For the test group, the medium was supplemented with selenite and T. foenum-graecum aqueous extract. The lenses were incubated for 24 h at 37°C. After incubation, the lenses were processed for the estimation
of reduced glutathione (GSH), lipid peroxidation product (malondialdehyde), and the antioxidant enzymes. In vivo selenite
cataract was induced in 9-day-old rats by subcutaneous injection of sodium selenite (25 μmol/kg body weight). Animals in the
test group were injected with different doses of aqueous extract of T. foenum-graecum 4 h before the selenite challenge. A fall in GSH and a rise in malondialdehyde levels were observed in control as compared
to normal lenses. T. foenum-graecum significantly (P < 0.01) restored glutathione and decreased malondialdehyde levels. A significant restoration in the activities of antioxidant
enzymes such as superoxide dismutase (P < 0.01), catalase, (P < 0.01), glutathione peroxidase (P < 0.01), and glutathione-S-transferase (P < 0.01) was observed in the T. foenum-graecum supplemented group as compared to control. In vivo, none of the eyes was found with nuclear cataract in treated group as
opposed to 72.5% in the control group. T. foenum-graecum protects against experimental cataract by virtue of its antioxidant properties. Further studies are warranted to explore
its role in human cataract. 相似文献
3.
Mohamed A. Haidara Mohamed D. Morsy Hesham A. Abdel-Razek Dimitri P. Mikhailidis Esma R. Isenovic 《Journal of physiology and biochemistry》2010,66(3):255-264
Septicemia leads to oxidative stress with overproduction of reactive-oxygen species (ROS) and consumption of endogenous antioxidant
enzymes. We tested a twofold hypothesis: (1) does oxidative stress (OxS) induced by sepsis acting alone or in concert with
augmented inflammatory processes contributes to sepsis-related vascular dysfunction, and, (2) whether ozone (O3) and l-canavanine (CAV) mitigate the negative impact of the aforementioned phenomena. We investigated the relative impact of treatment
with CAV and/or O3 on vascular OxS associated vascular functional changes in septicemic rats. For this study, 60 male Sprague–Dawley rats were
used and divided into six experimental groups (n = 10): control group (C), sham-operated (Sham), septicemic rats (S), S rats treated with CAV (100 mg/kg. i.p; S + CAV), S
rats treated with O3 (1.2 mg/kg, i.p.; S + O3) and S rats treated with both O3 and CAV (S + O3 + CAV). After 22 h, the mean arterial blood pressure (MAP), the aortic ring vascular reactivity to phenylephrine, abdominal
aortic blood flow (AABF), serum tumor necrosis factor-α (TNF-α) and plasma nitrite/nitrate (NOx) concentration were measured.
In addition, hepatic antioxidant enzyme activities sodium dismutase (SOD) and glutathione peroxidase (GSH-Px) were estimated.
Septicemia caused significant elevation of serum TNF-α (p < 0.001) and plasma NOx (p < 0.001) and significant (p < 0.001) reduction of AABF (p < 0.001), aortic vascular response to phenylephrine (p < 0.001), MAP (p < 0.001) and hepatic SOD and GSH-Px activity (p < 0.001) compared with the C group, while treatment with O3 and/or CAV induced significant amelioration of all those increases. Abnormalities were attenuated to a similar extent with
treatment with both O3 and CAV. These results suggested that concomitant administration of O3 and CAV alleviated the compromised vascular reactivity in septicemic conditions and prevent its progression into septic shock
compared with each alone. 相似文献
4.
Beob G. Kim Julye M. Adams Brian A. Jackson Merlin D. Lindemann 《Biological trace element research》2010,133(2):171-180
Dietary chromium(III) picolinate (CrPic) effects on circulating steroid hormones have been reported in various experimental
animals. However, direct effects of CrPic on adrenocortical steroidogenesis are uncertain. Therefore, the objective was to
determine the effects of CrPic on cortisol and dehydroepiandrosterone sulfate (DHEAs) secretion from H295R cells. In experiment
1, a 24-h exposure to CrPic (0 to 200 μM) had both linear (p < 0.001) and quadratic (p < 0.001) effects on cortisol secretion from forskolin-stimulated cells with the highest cortisol secretion at 0.1 μM of CrPic
and the lowest at 200 μM of CrPic. In experiment 2, a 48-h exposure to CrPic (200 μM) decreased cortisol (p < 0.07) release from forskolin-stimulated cells during a 24-h collection period. In experiment 3, a 48-h exposure to CrPic
(100 μM) decreased cortisol (p < 0.05) and DHEAs (p < 0.01) from forskolin-stimulated cells during a 24-h sampling period. In experiment 4, a 24-h exposure to forskolin followed
by a 24-h exposure to both forskolin and CrPic (100 and 200 μM) decreased both cortisol and DHEAs secretion (p < 0.01). This study suggests that at high concentrations, CrPic inhibits aspects of steroidogenesis in agonist-stimulated
adrenocortical cells. 相似文献
5.
Milan Dastych Dagmar Procházková Antonin Pokorný Libor Zdražil 《Biological trace element research》2010,133(3):265-269
The purpose of this study was to determine the different levels of copper and zinc in the serum, urine, and scalp hair of
patients with Wilson’s disease receiving different, currently accepted methods of treatment to reduce the copper load (penicillamine—group
1, n = 8; zinc—group 2, n = 8; penicillamine+zinc—group 3, n = 8). Blood, urine, and hair samples were collected from the patients. All three treatments resulted in a significant decrease
of the serum copper levels. Significantly increased levels of zinc in the serum were detected in the patients in groups 2
and 3 (19.1 and 18.8 μmol/l, respectively; p < 0.05). Copper excretion in the urine significantly increased during its administration to groups 1 and 3 (11.5 and 7.94 μmol/24 h
respectively; p < 0.001) due to the effect of penicillamine. The administration of zinc as monotherapy (group 2) or in combination with penicillamine
(group 3) led to an increase of its excretion (25.3 and 22.4 μmol/24 h, respectively; p < 0.01). Only an insignificant rise of the copper content in the hair was found in all three groups of patients. The content
of zinc in the hair did not differ significantly in any of the groups in comparison with the control group. 相似文献
6.
Güçlü BK Kara K Beyaz L Uyanik F Eren M Atasever A 《Biological trace element research》2008,125(2):160-169
This study was performed to determine the effects of copper proteinate on performance, blood chemistry, lipid peroxidation
status, and organs as well as copper deposition in the liver and eggs of laying hens. Seventy-two 30-week-old Bovans laying
hens were distributed into four groups with three replicates. Animals were fed basal diet containing at least 17% crude protein
and 2,800 kcal/kg metabolizable energy supplemented with either 0, 150, 300, or 450 mg/kg copper as copper proteinate. Supplementation
of 150 and 300 mg/kg copper increased egg production, whereas 450 mg/kg copper decreased (p < 0.001). Liver copper levels were elevated in 300 and 450 mg/kg copper-supplemented groups (p < 0.001). Egg copper contents increased in all treatment groups (p < 0.01). An increase in glucose (p < 0.001) and decreases in albumin (p < 0.01) and total cholesterol (p < 0.05) levels were determined with 300 and 450 mg/kg copper. Supplementation of 450 mg/kg copper increased alkaline phosphatase
and gamma glutamyl transpeptidase activities (p < 0.05), malondialdehyde, and high-density lipoprotein levels (p < 0.01) but decreased alanine aminotransferase and lactate dehydrogenase activities (p < 0.01). No gross and microscopic changes were observed in the liver and kidneys. These results indicated that 150 and 300 mg/kg
copper increased egg production without having marked adverse effects, but 450 mg/kg copper altered some blood chemistry variables
and reduced egg production in laying hens. 相似文献
7.
Sudipto Haldar Souvik Mondal Saikat Samanta Tapan Kumar Ghosh 《Biological trace element research》2009,131(2):110-123
The effects of supplemental chromium (Cr) as chromic chloride hexahydrate in incremental dose levels (0, 0.5, 1.0, and 1.5 mg/day
for 240 days) on metabolism of nutrients and trace elements were determined in dwarf Bengal goats (Capra hircus, castrated males, average age 3 months, n = 24, initial mean body weight 6.4 ± 0.22 kg). Live weight increased linearly (p < 0.05) with the level of supplemental Cr. Organic matter and crude protein digestibility, intake of total digestible nutrients,
and retention of N (g/g N intake) increased (p < 0.05) in a dose-dependent linear manner. Serum cholesterol and tryacylglycerol concentrations changed inversely with the
dose of supplemental Cr (p < 0.01). Supplemental Cr positively influenced retention of copper and iron (p < 0.05) causing linear increase (p < 0.01) in their serum concentrations. It was concluded that Cr supplementation may improve utilization of nutrients including
the trace elements and may also elicit a hypolidemic effect in goats. However, further study with regards to optimization
of dose is warranted. 相似文献
8.
Chae CH Jung SL An SH Jung CK Nam SN Kim HT 《Journal of physiology and biochemistry》2011,67(2):235-241
We investigated the effects of treadmill exercise performed regularly for 6 weeks on the levels of nerve growth factor (NGF),
tyrosine kinase A and p75 receptors, phosphatidylinositol 3-kinase (PI3-K), mitogen-activated protein kinase/extracellular
signal-regulated kinase (Erk) 1,2, cyclic AMP response element-binding protein (CREB), and caspase-3 in the soleus of rats
with streptozotocin (STZ)-induced diabetes. Thirty-two male Sprague–Dawley rats were divided into the following four groups:
(1) normal control group (NCG; n = 8), (2) normal exercise group (NEG; n = 8), (3) diabetes control group (DCG; n = 8), and (4) diabetes exercise group (DEG; n = 8). Diabetes was induced by intraperitoneal injection of STZ (55 mg/kg dissolved in 0.05 M citrate buffer, pH 4.5). Rats
were subjected to treadmill exercise 5 days a week for 6 weeks. The protein level of NGF significantly increased in the NEG
and DEG (p < 0.001), whereas the levels of tyrosine kinase A and p75 receptors significantly increased in the NEG (p < 0.001). The levels of t-PI3-K, p-PI3-K, and p-CREB, and the p-CREB/t-CREB ratio significantly increased in the NEG (p < 0.001, respectively). The p-PI3-K/t-PI3-K ratio significantly increased in the DEG (p < 0.001). The p-Erk1/t-Erk1 ratio significantly increased in the NEG (p < 0.001), whereas the p-Erk2/t-Erk2 ratio significantly decreased in the DCG and DEG (p < 0.001). The caspase-3 level significantly increased in the DCG compared with that in the DEG (p < 0.001). These results suggest that treadmill exercise increases NGF levels and accelerates p-PI3-K activation in order
to suppress apoptotic cell death in the soleus muscle of diabetic rats. 相似文献
9.
Casimiro-Lopes G de Oliveira-Junior AV Portella ES Lisboa PC Donangelo CM de Moura EG Koury JC 《Biological trace element research》2009,127(2):109-115
The purpose of this study was to compare plasma leptin, plasma zinc, and plasma copper levels and their relationship in trained
female and male judo athletes (n = 10 women; n = 8 men). Blood samples were obtained 24 h after training to measure plasma zinc, copper, and leptin levels. Subjects presented
similar values to age (22 ± 2 years old), body mass index (24 ± 1 kg/m2), plasma zinc (17.2 ± 2 μmol/L), copper (12.5 ± 2 μmol/L), and leptin (5.6 ± 1.3 μg/L). However, height, total body mass,
lean mass, fat mass, and sum of ten-skinfold thickness were higher in male than female. Plasma leptin was associated with
sum of ten skinfolds in male (r = 0.91; p < 0.001) and female athletes (r = 0.84; p < 0.003). Plasma zinc was associated with leptin in males (r = 0.82; p < 0.05) while copper was associated with plasma leptin in females (r = 0.66; p < 0.05). Our results suggest that young judo athletes lost sex-related differences in leptin levels. Plasma zinc, plasma
copper, and energy homeostasis may be involved in regulation of plasma leptin. 相似文献
10.
Manouchehr Nakhjavani Afsaneh Morteza Leila Khajeali Alireza Esteghamati Omid Khalilzadeh Firouzeh Asgarani Tiago F. Outeiro 《Cell stress & chaperones》2010,15(6):959-964
The evolutionary conserved family of heat shock proteins (HSP) is responsible for protecting cells against different types
of stress, including oxidative stress. Although the levels of HSPs can be readily measured in blood serum, the levels of HSP70
in patients with different durations of diabetes have not been studied before. We quantified serum HSP70 levels in a healthy
control group (n = 36) and two groups of type 2 diabetic patients, defined as newly diagnosed diabetes (n = 36) and patients with diabetes duration of more than 5 years (n = 37). The clinical characteristics and biochemical parameters were evaluated in the studied population. We found that serum
HSP70 levels were significantly higher in patients with diabetes when compared with controls (p < 0.001) and it was higher in patients with disease for more than 5 years than in newly diagnosed patients (p < 0.001). Serum HSP70 was inversely correlated with fasting blood sugar in patients with diabetes for more than 5 years (r = −0.500, p = 0.002), positively correlated with the history of hypertension in newly diagnosed patients (p < 0.001), and positively correlated with age in patients with diabetes (r = 0.531, p = 0.001). Serum level of HSP70 is significantly higher in patients with diabetes and correlates with the duration of disease.
Higher HSP70 in prolonged diabetes versus newly diagnosed diabetes may be an indicator of metabolic derangement in the course
of diabetes. 相似文献
11.
12.
Brain tissue was analyzed for acetylcholinesterase (AChE) activity from 24 American pronghorn antelope (Antilocapra americana) collected on the US Army Dugway Proving Ground (DPG) (latitude 40°13' 52" N, longitude 112°45' 01" W), Tooele County, Utah.
Pronghorn antelope from DPG were evaluated against 26 pronghorn antelope collected in Wyoming. The mean AChE activity was
significantly greater (P < 0.001) in the Wyoming control group (4.612 ± 0.193 μM/gm brain tissue/min) relative to DPG (4.032 ± 0.621 μM/gm brain tissue/min).
The DPG database exhibited a fourfold greater coefficient of variation, a tenfold greater variance, and a threefold increase
in the standard deviation when compared to control AChE activity. Furthermore, the 95% confidence interval for the control
and for the DPG data were not overlapping; the entire control data set was greater than the mean DPG AChE activity. A post
hoc sequential Bonferroni statistical procedure showed two significantly (P < 0.001) distinct subsets in the DPG data. Mean DPG Subset I AChE activity (4.528 ± 0.347 μM/gm brain tissue/min) was indistinct
from the mean control AChE value (4.612 ± 0.193 μM/gm brain tissue/min). The mean DPG Subset II AChE activity (3.537 ± 0.387 μM/gm
brain tissue/min) differed significantly (P < 0.001) from the mean control AChE activity. The sum of resulting α values from the multiple statistical tests did not exceed the selected α value of P < 0.05, validating the post hoc sequential Bonferroni statistical procedure. Pronghorn antelope represented by Subset II,
experienced a 23.3% mean loss of AChE activity suggesting sub-lethal organophosphate (OP) exposure rather than a low level
chronic environmental influence was experienced by a population subset of the DPG pronghorn antelope herd. The origin of the
DPG sublethal OP exposure and its long-term effects are speculative. 相似文献
13.
The effect of short-term treatment with Amiodarone on thyroid gland tissue was studied in a group of 26 New Zealand albino
rabbits. Ten rabbits were left untreated and served as controls; the remaining animals were treated with 10 mg/kg/day Amiodarone.
The serum levels of serum triiodothyronine (T3), thyroxine (T4), and thyroid stimulating hormone (TSH) levels were measured
at days 0 (baseline), 7, 30, and 45. The serum selenium levels were also measured, but only on days 0 and 45 of the experiment.
At the end of the experiment the animals were sacrificed and the levels of selenium, T3, T4, and iodine were determined in
thyroid tissue. After 30 days treatment the values of T3 were significantly lower than those of the untreated controls or
the baseline levels (p < 0.001). The T4 level was significantly lower and the TSH value was significantly higher after 45 days of Amiodarone (p < 0.001). In thyroid tissue the T3, T4, and iodine levels were significantly higher in the treated group when compared to
untreated controls (p < 0.05). These results show that Amiodarone induces changes in the hormone levels in both serum and thyroid tissues, as well
as in the amount of iodine taken up by the thyroid gland in rabbits. 相似文献
14.
Ayhan Dogukan Nurhan Sahin Mehmet Tuzcu Vijaya Juturu Cemal Orhan Muhittin Onderci James Komorowski Kazim Sahin 《Biological trace element research》2009,131(2):124-132
The present study was conducted to investigate the effects of chromium histidinate (CrHis) against experimentally induced
type II diabetes and on chromium (Cr), zinc (Zn), selenium (Se), manganese (Mn), iron (Fe), and copper (Cu) in serum, liver,
and kidney of diabetic rats. The male Wistar rats (n = 60, 8 weeks old) were divided into four groups. Group I received a standard diet (12% of calories as fat); group II were
fed standard diet and received CrHis (110 mcg CrHis/kg body weight per day); group III received a high-fat diet (HFD; 40% of calories as fat) for 2 weeks and then
were injected with streptozotocin (STZ) on day 14 (STZ, 40 mg/kg i.p.; HFD/STZ); group IV were treated as group III (HFD/STZ)
but supplemented with 110 mcg CrHis/kg body weight per day. The mineral concentrations in the serum and tissue were determined
by atomic absorption spectrometry. Compared to the HFD/STZ group, CrHis significantly increased body weight and reduced blood
glucose in diabetic rats (p < 0.001). Concentrations of Cr, Zn, Se, and Mn in serum, liver, and kidney of the diabetic rats were significantly lower
than in the control rats (p < 0.0001). In contrast, higher Fe and Cu levels were found in serum and tissues from diabetic versus the non-diabetic rats
(p < 0.001). Chromium histidinate supplementation increased serum, liver, and kidney concentrations of Cr and Zn both in diabetic
and non-diabetic rats (p < 0.001). Chromium supplementation increased Mn and Se levels in diabetic rats (p < 0.001); however, it decreased Cu levels in STZ-treated group (p < 0.001). Chromium histidinate supplementation did not affect Fe levels in both groups (p > 0.05). The results of the present study conclude that supplementing Cr to the diet of diabetic rats influences serum and
tissue Cr, Zn, Se, Mn, and Cu concentrations. 相似文献
15.
Mine Gulaboglu Bunyamin Borekci Ilhan Delibas 《Biological trace element research》2010,136(3):249-257
The aim of this study was to investigate the urine iodine concentration in women with severe preeclampsia and in healthy women
in Erzurum, Turkey. Urine specimens were obtained from 40 severe preeclampsia and 18 healthy pregnant women. Urinary iodine
levels were determined by the Foss method based on the Sandell–Kolthoff reaction. The urinary iodine level for women with
severe preeclampsia was 4.25 ± 2.7 μg/dL, lower than 20.89 ± 6.4 μg/dL of urinary iodine for healthy pregnant women (p < 0.001). Blood magnesium concentration was found to be 1.63 ± 0.05 mg/dL for women with severe preeclampsia, which is lower
than that of healthy pregnant women (1.87 ± 0.05 mg/dL; p < 0.001). There was a positive correlation between urinary iodine level and blood magnesium level in pregnant women with
preeclampsia (Pearson correlation coefficient = 0.43; p < 0.01). However, there was no correlation between urinary iodine level and blood magnesium level in healthy pregnant women.
There was no difference in thyroid hormone levels (T4, TSH, FT4) between women with severe preeclampsia and healthy pregnant
women. However, there was a difference in T3 thyroid hormone levels between women with severe preeclampsia (1.86 ± 0.4 μg/dL)
and healthy pregnant women (1.45 ± 0.3 μg/dL; p < 0.001). There was also a difference in FT3 between women with severe preeclampsia (2.77 ± 0.4 pg/mL) and healthy pregnant
women (2.41 ± 0.5 μg/dL; p < 0.01). Urinary iodine excretion is currently the most convenient laboratory marker of iodine deficiency. The method is
useful for the rapid and low-cost assessment of iodine deficiency. Our results suggested that urinary iodine concentration
might be a useful marker for prediagnosing preeclamptic women. In addition, iodine supplementation may also be considered
for preeclamptic therapy. 相似文献
16.
This paper presents the results of the first field study of the Brazilian endemic damselfish Stegastes rocasensis. Underwater data were collected at the Fernando de Noronha Archipelago (NE Brazil), where four sites were visually assayed
for local territorial and feeding behaviors, as well as habitat use. S. rocasensis preferentially fed on turf and macroalgae, and during the afternoon period. Its territory size ranged from 0.26 to 13.86 m2 (1.61 ± 0.23 m2). Our findings suggest that adults preferably inhabit shallow, turf-rich areas, while sub-adults and juveniles occupy deeper
areas with higher percent cover of invertebrates and hard corals, respectively. With regards to agonistic behaviors, pursuit
of intruders was the most frequent reaction recorded (p < 0.001); the highest level of aggression was elicited by territorial herbivores (p < 0.001). Nevertheless, analysis of attacks elicited by different fish species within S. rocasensis’ territory showed that more attacks were launched on conspecifics than on other fish species. 相似文献
17.
Shikha Mehta Prashant Kumar Rai Devendra Kumar Rai Nilesh Kumar Rai A. K. Rai Dane Bicanic Bechan Sharma Geeta Watal 《Food biophysics》2010,5(3):186-192
The aim of the study was to determine the effect of the elements of the extract of seed from Emblica officinalis on antioxidant enzymes and osmotic fragility of erythrocytes membrane in normal as well as streptozotocin-induced severely
diabetic albino Wister rats. The results revealed that the untreated diabetic rats exhibited increase in oxidative stress
as indicated by significantly diminished activities of free radical scavenging enzymes such as catalase (CAT) and superoxide
dismutase (SOD) by 37.5% (p < 0.001) and 18.6% (p < 0.01), respectively. However, the E. officinalis seed extract treatment showed marked improvements in CAT and SOD activities by 47.09% (p < 0.001) and 21.61% (p < 0.001), respectively. The enhanced lipid peroxidation by 30.87% (p < 0.001) in erythrocytes of untreated diabetic rats was significantly accentuated in the extract treated animals by 23.72%
(p < 0.001). The erythrocytes showed increased osmotic fragility due to diabetes in terms of hemolysis. It attained the normal
level in diabetic treated group. The findings thus suggest that E. officinalis seed extract has the potential to be exploited as an agent to boost the antioxidant system in the diabetic animal model.
Laser-induced breakdown spectroscopy has been used as an analytical tool to detect major and minor elements like Mg, Fe, Na,
K, Zn, Ca, H, O, C, and N present in the extract. The higher concentration of Ca (II), Mg (II) and Fe (II) as reflected by
their intensities are responsible for the antioxidant potential of E. officinalis. 相似文献
18.
19.
Acinetobacter sp. XMZ-26 (ACCC 05422) was isolated from soil samples obtained from glaciers in Xinjiang Province, China. The partial nucleotide
sequence of a lipase gene was obtained by touchdown PCR using degenerate primers designed based on the conserved domains of
cold-adapted lipases. Subsequently, a complete gene sequence encoding a 317 amino acid polypeptide was identified. Our novel
lipase gene, lipA, was overexpressed in Escherichia coli. The recombinant protein (LipA) was purified by Ni-affinity chromatography, and then deeply characterised. The LipA resulted
to hydrolyse pNP esters of fatty acids with acyl chain length from C2 to C16, and the preferred substrate was pNP octanoate showing a k
cat = 560.52 ± 28.32 s−1, K
m = 0.075 ± 0.008 mM, and a k
cat/K
m = 7,377.29 ± 118.88 s−1 mM−1. Maximal LipA activity was observed at a temperature of 15°C and pH 10.0 using pNP decanoate as substrate. That LipA peaked at such a low temperature and remained most activity between 5°C and 35°C indicated
that it was a cold-adapted enzyme. Remarkably, this lipase retained much of its activity in the presence of commercial detergents
and organic solvents, including Ninol, Triton X-100, methanol, PEG-600, and DMSO. This cold-adapted lipase may find applications
in the detergent industry and organic synthesis. 相似文献
20.
Park S Kang K Lee SW Ahn MJ Bae JM Back K 《Applied microbiology and biotechnology》2011,89(5):1387-1394
A plant-specific biogenic amine, serotonin, was produced by heterologous expression of two key biosynthetic genes, tryptophan
decarboxylase (TDC) and tryptamine 5-hydroxylase (T5H), in Escherichia coli. The native T5H, a cytochrome P450 enzyme, was unable to be functionally expressed in E. coli. Through a series of N-terminal deletions or additions of tagging proteins, we generated a functional T5H enzyme construct
(GST∆37T5H) in which glutathione S transferase (GST) was translationally fused with the N-terminal 37 amino acid deleted T5H. Dual expression
of GST∆37T5H and TDC using a pCOLADuet-1 E. coli vector produced serotonin at concentrations of approximately 24 mg l−1 in the culture medium and 4 mg l−1 in the cells. An optimum temperature of approximately 20°C was required to achieve peak serotonin production in E. coli because the low induction temperature gave rise to the highest soluble expression of GST∆37T5H. 相似文献