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| ORIGINAL ARTICLE |
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| Year : 2014 | Volume
: 8
| Issue : 4 | Page : 209-217 |
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Protective role of homoeopathic medicines on cerebral ischaemia in animals
Gulrana Khuwaja1, Tauheed Ishrat1, M Badruzzaman Khan1, Syed Shadab Raza1, M Moshahid Ahmad Khan1, Ajmal Ahmad1, Kumar Vaibhav1, Anil Khurana2, Fakhrul Islam1
1 Department of Medical Elementology and Toxicology, Neurotoxicology Lab, Jamia Hamdard, New Delhi, India
2 Deputy Director (H), Central Council for Research in Homoeopathy, New Delhi, India
| Date of Submission | 29-Oct-2014 |
| Date of Acceptance | 08-Dec-2014 |
| Date of Web Publication | 18-Dec-2014 |
Correspondence Address:
Dr. Fakhrul Islam
Department of Medical Elementology and Toxicology, Neurotoxicology Lab, Jamia Hamdard, New Delhi-110062
India
M Badruzzaman Khan
Department of Medical Elementology and Toxicology, Neurotoxicology Lab, Jamia Hamdard, New Delhi
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0974-7168.147320
Objective: Cerebral ischaemia is the third leading cause of death after cancer and myocardial infarction. The protective effect of some homoeopathic drugs has been studied in the Middle Cerebral Artery Occlusion (MCAO) model of rat.
Materials and Methods: The rats were pretreated with 200C potency once daily for 5 days orally (1 drop or 21 μl) and post treated after 24 hr of MCAO with 30C potency three times a day for 5 days orally (1 drop or 21 μl) with homoeopathic medicines Crotalus, Phosphorus, Arnica and Crocus.
Results: The content of antioxidants, Thiobarbituric Acid Reactive Substances (TBARS) was elevated significantly whereas the level of Glutathione (GSH) was depleted significantly in the MCAO of rats as compared to the sham group. The activities of antioxidant enzymes, Glutathione Peroxidase (GPx), Glutathione Reductase (GR) and Glutathione-S-Transferase were decreased significantly in MCAO group as compared to sham group. The medicines used on rats (pre and post treated in potencies of 200C and 30C respectively) have protected the activities of these enzymes significantly when compared with the animals of MCAO group.
Conclusion: The study has shown that the homoeopathic drugs have protected most of the studied parameters significantly but further studies are required to comment on the mechanism and reproducibility of homoeopathic drugs. Keywords: Antioxidants, Arnica montana, Cerebral ischaemia, Crotalus horridus, Homoeopathy, Stroke
How to cite this article:
Khuwaja G, Ishrat T, Khan M B, Raza SS, Ahmad Khan M M, Ahmad A, Vaibhav K, Khurana A, Islam F. Protective role of homoeopathic medicines on cerebral ischaemia in animals. Indian J Res Homoeopathy 2014;8:209-17 |
How to cite this URL:
Khuwaja G, Ishrat T, Khan M B, Raza SS, Ahmad Khan M M, Ahmad A, Vaibhav K, Khurana A, Islam F. Protective role of homoeopathic medicines on cerebral ischaemia in animals. Indian J Res Homoeopathy [serial online] 2014 [cited 2022 Sep 29];8:209-17. Available from: https://www.ijrh.org/text.asp?2014/8/4/209/147320 |
| Introduction | |  |
Stroke is the third leading cause of mortality worldwide. More than two-thirds of stroke deaths occur in the developing world. [1] Present demographic trends suggest that the Indian population will survive through the peak years of stroke occurrence (55-65 yr) and the degree of the residual morbidity will pose a major medical problem. Community surveys from many regions of India show a crude prevalence rate for strokes presumed to be of vascular origin in the range of 200 per 100,000 persons.
Middle Cerebral Artery Occlusion (MCAO) models have been suggested to be of particular relevance because this is the vessel most commonly affected in stroke victims. [2] More recently, MCAO technique have been incorporated with reperfusion and thereby, it is proposed more closely to the clinical situations. This view is given credence by the fact that clinically the MCA is the primary site of many strokes and because reperfusion frequently occurs as a result of recanalisation.
Metabolic studies of ischaemic brain have consistently shown a rapid decrease of high energy intermediates, increased lactate and a shift towards reduction of the mitochondrial respiratory chain metabolites. [3] As a final strategy to prevent death, the cells in ischaemic area initiate anaerobic glycolysis. However the energy obtained with anaerobic glycolysis can not totally compensate for the energy shortage. It provides a very small fraction of the energy, needed for the neuronal survival. Shortage of energy interrupts the activity of the cellular ion pumps and therefore, the intracellular calcium and the extracellular potassium concentrations increase, within 1-2 min after ischaemia. Thereafter the extracellular concentrations of neurotransmitters increase, in particular glutamate and dopamine, and oedema occurs. To some extent this early damage is reversible. Continuation of the ischaemic conditions however rapidly leads to extensive irreversible damage resulting from a so-called ischaemic cascade.
Cerebral ischaemia is a complex event and it enhances the formation of reactive oxygen species (ROS) in the brain, [4] which leads to cell death in hippocampus, striatum and different cortical areas. [5] Cytotoxic effects of ROS alter several fundamental physiopathological steps, which lead to neuronal death. [6] Brain being more vulnerable to ROS [7] caused a series of metabolic [8] and enzymatic changes, [5] which promote delayed cell death. [9] Therefore, changes in antioxidant enzymes activity may play a pivotal role to switch on and off the cascade of events that kill cells at their late stages. [10],[11]
Glutathione (GSH) plays a central role within the finely tuned network of antioxidant systems that respond to the oxidative insult through its peroxide scavenging functions via Glutathione-S-Transferase (GST) and Glutathione Peroxidase (GPx). It efficiently removes H 2 O 2, maintaining protein thiol pools in their appropriate redox state in the cytosol and mitochondria, thus playing a significant neuroprotective role during energy stress. [12] Lipid peroxidation is an important implication in ischaemia-reperfusion, [11],[13] which increases the formation of conjugated dienes [14] as well as the formation of malondialdehyde content. [15]
Superoxide dismutase (SOD), catalase and GPx are enzymes responsible for the degradation of O 2• - radical and H 2 O 2 content. GPx participates in the pathways responsible for detoxification of lipid peroxy radicals. The function of GST includes detoxification of 4-hydroxynon-2-enal, reactive product of lipid peroxidation and the reduction of lipid hydro peroxides. [16]
Homoeopathic medicines are used clinically for after effects of cerebral vascular accidents and injuries but no animal experimentation has been carried out to evaluate their efficacy in standard laboratory conditions. Study was therefore undertaken in collaboration with Central Council for Research in Homoeopathy, New Delhi, India to assess the protective role of homoeopathic medicines on cerebral ischaemia in animals.
| Materials and Methods | | |
The following homoeopathic medicines were selected for the treatment or slow down of cerebral ischaemia as suggested by Central Council for Research in Homoeopathy.
Animals and drug administration
Wistar albino male rats weighing 250-300 g were used for the study. The animals were divided into four groups for each drug and each group had eight animals. Group 1 was vehicle operated sham, Group 2 was MCAO, Group 3 was MCAO + drug and Group 4 was drug only.They were kept in separate cages under standard laboratory condition with 12 hr light-dark period at standard rat diet and water ad-libitum.
The animals of MCAO group were pretreated with 200C potency of the selected drug orally (1 drop or 21 μl), one time for 5 days for one set of study. After 5 days, MCAO was developed and the same drug of 30C potency was given 3 times a day orally (1 drop or 21 μl), for 5 days. Thereafter, the animals were sacrificed and their brain was dissected out quickly to separate hippocampus and frontal cortex for biochemical evaluation.
Surgical Procedure
Focal brain Ischaemia was induced by the intraluminal suture, MCAO method as recently described by us. [11] The animals were anaesthesized by choral hydrate 400mg/kg of body weight. The right Common Carotid Artery (CCA), Internal Carotid Artery (ICA) and External Carotid Artery (ECA) was exposed through a midline incision. The ECA was ligated at three sites and cut between two ligatures closer to the head. The cut end was pulled down and a nick was made close to the proximal ligature. Through the nick, a monofilament (4-0) of nylon stiffened with wax was introduced into the ICA. The monofilament was advanced into the ICA 17-19mm beyond the carotid bifurcation. Mild resistance indicates that the monofilament is properly lodged into the Anterior Cerebral Artery (ACA) and thus block the blood flow to the Middle Cerebral Artery (MCA).The neck incision was then sutured and the animal was allowed to recover. After 2 hours of occlusion the monofilament was retracted to allow the reperfusion.
| Biochemical Studies | | |
Tissue preparation: On sixth day of MCAO, animals were sacrificed and brains were taken out quickly and kept on ice. Frontal cortex and hippocampus was dissected out and homogenized in phosphate buffer (10mM, pH 7.0) to give 5% homogenate and centrifuged at 800 g for 5 min at 4°C. the supernatant was used for the TBARS and supernatant was taken in another centrifuge tube to centriguge at 10,500 × g for 20 min at 4°C.The supernatant called Post Mitochondrial Supernatant (PMS) was used for another biochemical study and stored at -70°C when not used immediately.
| Assays of Non Enzymatic Antioxidants | | |
Estimation of reduced glutathione
Reduced glutathione was assayed by the method of Jollow et al. [17] One ml PMS (5%) was precipitated with 1.0 ml sulfosalicylic acid (4%). The samples was kept at 4°C for 1 hr and then subjected to centrifugation at 1200 g for 15 min at 4°C. The assay mixture was contained 0.1ml filtered aliquot, 2.7 ml phosphate buffer (0.1M, pH 7.4) and 0.2ml DTNB (0.4% in phosphate buffer 0.1 M, pH 7.4) in a total volume of 3.0ml. The yellow colour developed was read immediately at the OD 412nm.
Assay of lipid peroxidation
The procedure of Utley et al. [18] as modified by us [19] was used for the estimation of the rate of lipid peroxidation (LPO). 0.5ml of homogenate (5% in child KCl) was pipetted in a test tube (15 × 100 mm) and incubated at 37 ± 1°C in a metabolic shaker (120 rpm/min) for 60 min. Another 0.5 ml of the same homogenate was pipetted in a centrifuge tube and placed at 0°C. After 1 hr of incubation, 0.5 ml 5% chilled TCA followed by 0.5 ml of 0.67% TBA was added to each vial and mixed after each addition. The aliquot from each vial was transferred to centrifuge tube and centrifuged at 3,500 rpm for 15 min. Thereafter, supernatant was transferred to another tube and placed in the boiling water bath. After 10 min, the test tubes were cooled and the absorbance of the colour was read at the OD 535 nm.
| Assays of Enzymatic Antioxidants | | |
Estimation of Glutathione-S-transferase activity
GST activity was measured by the method of Habig et al. [20] The reaction mixture consisted of 1.425 ml phosphate buffer (0.1M, pH 7.4), 0.2 ml reduced glutathione (1mM), 0.025 ml CDNB (1-Chloro - 2,4 dinitrobenzene) (1mM) and 0.3 ml PMS in a total volume of 2.0 ml. The changes in absorbance was recorded at the OD 340 nm and enzyme activity was calculated as nmol CDNB conjugate formed/min/mg protein using a molar extinction coefficient of 9.6 × 10 3 M -1 cm -1 .
Glutathione peroxidase activity
Glutathione peroxidase activity was estimated according to the procedure described by Mohandas et al. [21] The reaction mixture consisted of 1.44 ml phosphate buffer (0.05M, pH 7.0), 0.1 ml of EDTA (1 mM), 0.1ml of sodium azide (1 mM), 0.05 ml of glutathione reductase (1 eu/ml), 0.10ml of glutathione (1 mM), 0.10ml of NADPH (Nicotinamide Adenine Dinucleotide Phosphate reduced), (0.2 mM), 0.01 ml of hydrogen peroxide (0.25 mM) and 0.1ml of PMS in a final volume of 2 ml. The disappearance of NADPH at the OD 340 nm was being recorded at room temperature. The enzyme activity was calculated as nmol NADPH oxidized/min/mg/protein by using molar extinction coefficient 6.22 × 10 -3 M -1 cm -1 .
Glutathione reductase activity
Glutathione reductase activity was assayed by the method of Carlberg and Mannervik [22] ( 1975), as modified by Mohandas et al. [21] The assay system consisted of 1.65ml phosphate buffer (0.1 M, pH 7.6), 0.1 ml NADPH (0.1mM), 0.1ml EDTA (0.5mM) and 0.05 ml oxidized glutathione (1 mM) and 0.1 ml of PMS in a total volume of 2ml. The enzyme activity was quantified at room temperature by measuring the disappearance of NADPH at the OD 340 nm and was calculated as nmol NADPH oxidized/min/mg protein using molar extinction coefficient of 6.22 × 10 -3 M -1 cm -1.
Estimation of protein: Protein was estimated by the method of Lowry et al. [23]
Statistics
Results are expressed as Mean ± SEM of eight animals in each group. One way ANOVA with Tukey - Kramer post hoc analysis was used to analyze differences between the groups. Significance was ascertained at P < 0.05.
| Results | | |
The pretreatment with 200C potency for 5 days once daily and post treatment with 30C potency three times a day for 5 days of Crotalus and Phosphorus has significantly protected the increased level of TBARS in MCAO + C and MCAO + P group animals when compared with MCAO group animals [Figure 1]. No significant alteration was observed in sham group pretreated with 200C potency and post treated with 30C of Crotalus and Phosphorus in S + C and S + P group animals when compared with S group animals. | Figure 1: Effect of Crotalus and Phosphorus on lipid peroxidation in hippocampus. Values are expressed as mean ± S.E. aP <0.01 sham vs. MCAO, bP < 0.01 MCAO vs. MCAO + C and MCAO + P
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[Figure 2] shows the effect of Crotalus and Phosphorus on GSH in MCAO group and its protection. The GSH content was depleted significantly in MCAO group as compared to S group. The pretreatment of MCAO group with 200C potency for 5 days once daily and post treatment with 30C potency for 5 days daily three times a day with Crotalus and Phosphorus has protected GSH content significantly in hippocampus. No significant alteration was observed in sham group pretreated and posttreated with 200C and 30C potency of Crotalus and Phosphorus respectively in S + C and S + P group. | Figure 2: Effect of Crotalus and Phosphorus on GSH in hippocampus. Values are expressed as mean ± S.E.aP < 0.01, sham vs. MCAO, bP < 0.01 MCAO vs MCAO + C and MCAO + P
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[Table 1] shows the protective effect of Crotalus and Phosphorus on the activities of GPx, GR and GST in MCAO group. The activities of GPx, GR and GST were depleted significantly in MCAO group. The pretreatment of MCAO group with C200 potency of Crotalus and Phosphorus and post treatment with 30C potency of Crotalus and Phosphorus have protected GPx, GR and GST activities significantly. No significant alteration was observed in the activities of GPx and GST in sham group pretreated with 200C potency and post treated with 30C potency of Crotalus and Phosphorus.The GR activity was depleted significantly in S group pretreated with 200C potency and post treated with 30C potency of Crotalus but it was not significant with Phosphorus. | Table 1: Effect of Crotalus (C) and Phosphorus (P) on the activities of antioxidant enzymes (GPx, GR and GST)
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[Figure 3] shows the effect of Arnica and Crocus on TBARS in MCAO group and its protection by these homoeopathic drugs. The TBARS content was elevated significantly in MCAO group. The pretreatment of MCAO group with 200C potency and post treatment with 30C potency of Arnica and Crocus has protected TBARS level significantly as compared to MCAO group. | Figure 3: Effect of Arnica and Crocus on lipid peroxidation in hippocampus. Values are expressed as mean ± S.E. aP < 0.05 sham vs. MCAO, bP < 0.05 MCAO vs MCAO + Cr and MCAO + Ar
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[Figure 4] shows the protective effect of Arnica and Crocus on the content of GSH in MCAO group. The GSH content was depleted significantly in MCAO group. The pretreatment of MCAO group with 200C for 5 days once daily and post treatment with 30C potency of Arnica and Crocus for 5 days, 3 times a day has protected GSH content significantly when compared with MCAO group. | Figure 4: Effect of Arnica and Crocus on GSH in hippocampus. Values are expressed as mean ± S.E.aP < 0.05 sham vs. MCAO, bP < 0.05 MCAO vs MCAO + Cr and MCAO + Ar
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[Table 2] shows the protective effect of Crocus and Arnica on the activities of GPx, GR and GST in MCAO group. The activities of GPx, GR and GST were depleted significantly in MCAO group. The pretreatment of MCAO group with 200C potency of Crocus and Arnica and post treatment with 30C potency of Crocus and Arnica have protected GPx, GR and GST activities significantly. | Table 2: Effect of Crocus and Arnica on the activities of antioxidants enzymes (GPx, GR and GST)
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[Table 3] shows the comparative study of homoeopathic drugs, Arnica and Crocus with alcoholic extract of Crocus sativus and aqueous extract of the Garlic on the prevention of cereberal ischaemia. The homoeopathic drugs (Arnica and Crocus) have shown the equal protective effect as shown by the herbal extract of Crocus sativus and Garlic. The protection of the herbal extract (Crocus sativus) was slightly better on the contents of LPO and GR (Glutathione Reductase) but the homoeopathic medicine, Arnica has shown better protection on the activity of GPx as compared to the herbal extract of Crocus sativus. The aqueous extract of Garlic has shown better protection on LPO, GSH, GST and GR as compared to the homoeopathic drugs (Arnica and Crocus). | Table 3: Effect of cerebral ischaemia on lipid peroxidation, GSH and GSH dependent enzymes and their comparison with the earlier published work on the herbal extracts
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| Discussion and Conclusion | | |
There is no any evidence or report of homoeopathic medicine used on animal model of cerebral ischaemia. The data of our study has shown that the Arnica and Crotalus were more efficacious in the prevention of cerebral ischaemia than Crocus and Phosphorus. The increased level of lipid peroxidation in rat brain in the present study after ischaemia and reperfusion observed after motor performance may be due to hyperexcitability of neurons in the early post-ischaemic period caused by excessive accumulation of glutamate in the extracellular fluid [24],[25] which can induce excessive activation of N-methyl-D-aspartate or2-amino-3-hydroxy-5-isoxazole propionate/kainate receptors resulting in accumulation of intracellular fluid and sodium and calcium ions [26] which induced generation of lipid peroxide and free radicals.
In cerebral ischaemia, free radicals have been implicated as important pathogenic factors in their pathogenesis. Hypothetically, the mechanisms by which the free radicals are generated are complex and depend on multiple interacting factors: (a) shortage of O2• at the cytochrome oxidase step may give rise to leakage of partially reduced oxygen species; or (b) a rapid fall in cellular ATP, due to diminished aerobic oxidation, may result in the alteration of ionic transport with cytosolic calcium overload. Free radicals generated by the disorder, attack the membrane phospholipids causing their peroxidation, which is the fundamental aspect of free radical damage in brain due to high lipid content. [27] The peroxidative processes in the brain are surely contributory to the inactivation of membrane-bound enzymes, since phospholipids are important for optimum activity of many enzymes. On the other hand, increased catabolism during early training appears to be the main mechanism underlying the generation of free radicals and lipid peroxidation after motor performance in the brain of cerebral ischaemic rats.
It was also noticeable that the elevation of Malonadialdehyde (MDA) level after 22 hrs of reperfusion was accompanied by significant depletion in brain GSH after ischaemic brain injury. [28] GSH also plays a crucial role in the regulation of expression of several redox-sensitive antioxidant and anti-inflammatory genes [29] processes that are aggravated especially post-ischaemic insult as a result of reperfusion of white blood cells to the injured area. [30] As a result, there is a rapid loss of reducing equivalents of the cell, and hence an onset of oxidative stress. The oxidative stress further leads to the up-regulation of expression of a wide variety of pro-inflammatory cytokines, including adhesion molecules, all of which contribute to tissue injury and apoptosis/necrosis. [31],[32] Therefore, maintenance of the GSH pool and other antioxidant levels is critical to cell survival and adaptation to the ischaemic injury. [33] In response to the battery of free radicals generated during ischaemia, the cells initially neutralize the oxidative challenge via GSH-mediated antioxidant mechanisms. [34],[35] However, a rapid decline in the levels of GSH, soon follows, which ultimately leads to tissue injury.
Thus, GSH depletion in cerebral ischaemia would increase the susceptibility of plasma membranes towards peroxide attacks. However, the main cause of GSH loss during oxidative stress in brain ischaemia is the formation of protein glutathione mixed disulfides and loss of protein thiols. [36] The loss of GSH and formation of protein glutathione mixed disulfides in the brain result in the various membrane dysfunctions, such as inhibition of Na + , K + -ATPase. [37] This enzyme is essential for cellular excitability and is very susceptible to free radical reaction and lipid peroxidation because it is embedded in the cell membrane and requires phospholipids for maintenance of its activity. [38],[39],[40]
Our data indicate that restoration of glutathione content and its dependent enzymes, which maintains energy metabolism, may reduce the deleterious effect of motor performance after acute cerebral ischaemia and support the potential clinical utility of homoeopathic medicines in treating acute cerebro-vascular diseases in humans. This suggests that the antioxidant property of homoeopathic medicines acted as a possible mechanism in protecting the neurons, possibly by increasing the endogenous defensive capacity of the brain to combat oxidative stress induced by ischaemia/reperfusion. Thus, homoeopathic medicines may be considered as a potential candidate in the armamentarium of drugs for prophylactic treatment in patients who are prone to stroke.
The comparative study of Arnica and Crocus sativus with aqueous extract of garlic from the medicinal plant has shown approximately equal effect on the contents of anti-oxidants and activity of anti-oxidant enzymes. The comparative study is quite interesting and none has reported before this. On the basis of comparative study with homoeopathic medicine and herbal extracts we have hypothesised that the homoeopathic medicines will be better to cure the neurodegenerative disorder as compared to the extract of medicinal herbal plants having less or no side effect. A further detail and comparative study taking two homoeopathic drugs and their herbal extracts will give a better understanding between the homoeopathic medicines and Ayurveda or Unani medicines for the cure of neurodegenerative disorders.
This is the first study of homoeopathic medicines on the cerebral ischaemia in animal model. Though the homoeopathic drugs have protected most of the studied parameters significantly but further studies are required to comment on mechanism and reproducibility.
Schizophrenia and bipolar disorder are associated with lowered glutathione. Accruing data suggest that oxidative stress may be a factor underlying the pathophysiology of Bipolar Disorder (BD), Major Depressive Disorder (MDD), and Schizophrenia (SCZ). Glutathione (GSH) is the major free radical scavenger in the brain. Diminished GSH levels elevate cellular vulnerability towards oxidative stress; characterized by accumulating reactive oxygen species. Replenishment of glutathione using N-acetyl cysteine has been shown to reduce symptoms of both disorders. The findings also open up the new vistas of assessing the role of these medicines in above psychiatric disorders.
| Acknowledgement | | |
We are thankful to the Central Council for Research in Homoeopathy, Ministry of Health and Family Welfare, Government of India, New Delhi for the financial and technical support. We acknowledge the technical inputs provided by the Central Coordination team of CCRH, Prof. C. Nayak, Former Director General, Dr. Hari Singh, former Research Officer while monitoring the study.
| References | | |
| 1. | Bonita R. Epidemiology of stroke. Lancet 1992; 339:342-4.  |
| 2. | Mohr JP, Gautier JC, Hier D, Stein RW. In: Barnett HJ, Stein BM, Mohr JP, Yastu FM, editors. Stroke: Pathophysiology, Diagnosis and Management. 1 st edition.Vol. 1.Churchill Livingstone; 1986. p. 377-450. |
| 3. | Goldberg ND, Passonneau JV, Lowry OH. Effects of changes in brain metabolism on the levels of citric acid cycle intermediates. J BiolChem 1966;241:3997-4003. |
| 4. | Li L, Shen YM, Yang XS, Wu WL, Wang BG, Chen ZH, et al. Effects of spiramine T on antioxidant enzymatic activities and nitric oxide production in cerebral ischemia-reperfusion gerbils. Brain Res 2002; 944:205-9. |
| 5. | Larsson E, Lindvall O, Kokala Z. Stereological assessment of vulnerability of immunocytochemically identified straital and hippocampal neurons after global cerebral ischemia in rats. Brain Res 2001;913:117-32. |
| 6. | Cao W, Carney JM, Duchon A, Floyd RA, Chevion M. Oxygen free radical involvement in ischemia and reperfusion injury to brain. NeurosciLett 1998;88:233-8. |
| 7. | Nelson CW, Wei EP, Povlishock JK, Kontos HA, Moskowitz MA. Oxygen radicals in cerebral ischemia. Am J Physiol 1992; 263:H1356-62. |
| 8. | Sims NR. Energy metabolism and selective neuronal vulnerability following global cerebral ischemia. Neurochem Res 1992;17:923-31. |
| 9. | Won MH, Kang T, Park S, Jeon G, Kim Y, Seo JH, et al. The alterations of N-Methyl-D-aspartate receptor expressions and oxidative DNA damage in the CA1 area at the early time after ischemia-reperfusion insult. Neurosci Lett 2001;301:139-42. |
| 10. | Homi HM, Frietas JJ, Curi R, Velasco IT, Bonfim A, Junior S. Changes in superoxide dismutase and catalase activities of rat brain regions during early global transient ischemia/reperfusion. Neurosci Lett 2002;333:37-40. |
| 11. | Salim S, Ahmad M, Zafar KS, Ahmad AS, Islam F. Protective effect of Nardostachys Jatamansi in rat cerebral ischemia. Pharmacol Biochem Behav 2003;74:481-6. |
| 12. | Zeevalk GD, Bernard LP, Nicklas WJ. Role of oxidative stress and glutathione system in loss of dopamine neurons due to impairment of energy metabolism. J Neurochem 1998;70:1421-30. |
| 13. | Comporti M. Lipid Peroxidation, In: Poli G, Albano E, Dianzani MU, editors.An overview: Free Radicals: From Basic Science to Medicine. 1 st ed. Basel: Birkhauser Verlag; 1993:65-79. |
| 14. | Watson BD, Busto R, Goldberg WJ, Santiso M, Yoshida S, Ginsberg MD. Lipid Peroxidation in vivo induced by reversible global ischemia in rat brain. J Neurochem 1984;42:268-74. [ PUBMED] |
| 15. | Vagnozzi R, Lazzarino G, Tavazzi B, Di Pierro D, Siragusa P, Giuffre R, Giardina B. Incomplete cerebral ischemia in the rat promotes increase of the tissue and plasma malondialdehyde. Biol Trace Elem Res 1995;47:241-6. |
| 16. | Nanduri B, Hayden JB, Awasthi YC, Zimniak P. Amino acid residue 04 in an alpha-class glutathione S-transferase is essential for the high selectivity and specificity of the enzyme for 4-hydroxynonenol. Arch Biochem Biophys 1996; 335:305-10. |
| 17. | Jollow DJ, Mitchell JR, Zampaghone N, Gillete JR. Bromobenzene-induced liver necrosis. Protective role of glutathione and evidence for 3,4-bromobenzene oxide as the hepatotoxic intermediate. Pharmacology 1974;11:151-69. |
| 18. | Utley HC, Bernheim F, Hochslein P. Effect of sulfhydryl reagent on peroxidation in microsome. Arch Biochem Biophys 1967;260:521-31. |
| 19. | Islam F, Zia S, Sayeed I, Zafar KS, Ahmad AS. Selenium-induced alteration of lipids, lipid peroxidation, and thiol group in circadian rhythm center of rat. Biol Trace Elem Res2002; 90:203-14. |
| 20. | Habig WH, Pabst M, Jakoby WB. Glutathione-S-Transferase.The first enzymatic step in mercapturic acid formation. J Biol Chem 1974;249:7130-9. |
| 21. | Mohandas J, Marshall JJ, Duggin GG, Horvath JS, Tiller D. Differential distribution of glutathione and glutathione related enzymes in rabbit kidneys: Possible implication in analgesic neuropathy. Cancer Res 1984;44:5086-91. |
| 22. | Carlberg I, Mannerviek B. Purification and characterization of the flavoenzyme glutathione reductase from rat liver. J Biol Chem 1975; 250:5475-80. |
| 23. | Lowry OH, Rosenbrough NJ, Farr AL, Randall RJ. Protein measurement with the folin phenol reagent. J Biol Chem 1951;193:265-75. |
| 24. | Choi DW. Glutamate neurotoxicity and disease of the nervous system. Neuron1988;1:623-34. |
| 25. | Benveniste H. The excitotoxin hypothesis in relation to cerebral ischemia. Cerebrovasc Brain Metab Rev1991;3:213-45. |
| 26. | Coyle JT, Puttfarcken P. Oxidative stress, glutamate, and neurodegenerative. Science 1993;262:689-95. |
| 27. | Siesjö BK. Calcium in the brain under physiological and pathological conditions. Eur Neurol 1990;30:3-9. |
| 28. | Sinha K, Chaudhary G, Gupta YK. Protective effect of resveratrol against oxidative stress in middle cerebral artery occlusion model of stroke in rats. Life Sci 2002;71:655-65. |
| 29. | Hall ED. Free radicals in central nervous system injury. In: Rice-Evans, CA, Burdon RH, editors.Free Radical Damage and Its Control. 1 st edition. New York: Elsevier;1991. p. 217-38. |
| 30. | Lovine WG. Glutathione, lipid peroxidation and regulation of cytochrome P-450 activity. Life Sci 1982;31:779-84. |
| 31. | Rahman I, Bel A, Mulier B, Lawson MF, Harrison DJ, Macnee W, et al.Transcriptional regulation of gamma-glutamylcysteinesynthetase-heavy subunit by oxidants in human alveolar epithelial cells. Biochem Biophys Res Commun 1996;229:832-7. |
| 32. | Marcheselli VL, Hong S, Lukiw WJ, Tian XH, Gronert K, Musto A, et al. Noveldocosanoids inhibit brain ischemia-reperfusion-mediated leukocyte infiltration and pro-inflammatory gene expression. J Biol Chem 2003;278:43807-17. |
| 33. | Frijns CJ, Kappelle LJ. Inflammatory cell adhesion molecules in ischemic cerebrovascular disease. Stroke 2002;33:2115-22. |
| 34. | Berti R, Williams AJ, Moffett JR, Hale SL, Velarde LC, Elliott PJ, et al. Quantitative real-time RT-PCR analysis of inflammatory gene expression associated with ischemia- reperfusion brain injury. J Cereb Blood Flow Metab 2002; 22:1068-79. |
| 35. | Zimmermann C, Winnefeld K, Streck S, Roskos M, Haberl RL. Antioxidant status in acute stroke patients and patients at stroke risk. Eur Neurol 2004;51:157-61. |
| 36. | Ravindranath V, Reed DJ. Glutathione depletion and formation of glutathione-protein mixed disulphide following exposure of brain mitochondria to oxidative stress. Biochem Biophys Res Commun 1990;1 69:1075-9. |
| 37. | Reed DJ. Glutathione: Toxicological implications. Annu Rev Pharmacol Toxicol 1990;30:603-31. |
| 38. | CooperAJ, Pulsinelli WA, Duffy TE. Glutathione and ascorbate during ischemia and post ischemic reperfusion in rat brain. J Neurochem 1980;35:1242-5. |
| 39. | Furui T, Tanaka I, Iwata K. Alterations in Na(+)-K(+)-ATPase activity and beta-endorphin content in acute ischemic brain with and without naloxone treatment. J Neurosurg 1990;72:458-62. |
| 40. | Ildan F, Polat S, Gocer AI, Oner A, Isbir T, Mete UO, et al. The effect of the pretreatment of intravenous high dose methylprednisolone on Na + , K + /Mg +2 -ATPase and lipid peroxidation and early ultrastructural findings following middle cerebral artery occlusion in the rat. Acta Neurochir (Wien) 1996;138:338-45. |
[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3]
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