Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0917798 (cerebral ischemia)
 17,036 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Interleukin-1 (IL-1) synthesis in the brain is stimulated by mechanical injury and IL-1 mimics some effects of injury, such as gliosis and neovascularization. We report that neuronal death resulting from focal cerebral ischaemia (middle cerebral artery occlusion, 24 h) is significantly inhibited (by 50%) in rats injected with a recombinant IL-1 receptor antagonist (IL-1ra, 10 micrograms, icv 30 min before and 10 min after ischaemia). Excitotoxic damage due to striatal infusion of an NMDA-receptor agonist (cis-2,4-methanoglutamate) was also markedly inhibited (71%) by injection of the IL-1ra. These data indicate that endogenous IL-1 is a mediator of ischaemic and excitotoxic brain damage, and that inhibitors of IL-1 action may be of therapeutic value in the treatment of acute or chronic neuronal death.
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PMID:Interleukin-1 receptor antagonist inhibits ischaemic and excitotoxic neuronal damage in the rat. 138 88

The effects of interleukin-1 receptor antagonist (IL-Ira) on both local cerebral blood flow and neuronal damage of the hypothalamus, corpus striatum, cortex or thalamus were assessed in rats with heat stroke. Heat stroke was induced by exposing the urethane-anesthetized rats to a high ambient temperature (42 degrees C). Damage to the hypothalamus, corpus striatum, cortex or thalamus was scored on a scale of zero to three modified from the grading system of Pulsinelli and colleagues in which: 0 = normal, 1 = few neurons damaged, 2 = many neurons damaged, and 3 = all neurons damaged. During the onset of heat stroke, as compared to those of normothermia controls, the heat stroke rats displayed a higher value of colonic temperature or neuronal damage score, as well as a lower value of local cerebral blood flow or mean arterial blood pressure. In addition, compared to those of normothermic, control rats, the heat stroke rats had increased interleukin-1 and tumor necroting factor production in the diencephalon, brain stem and cortex. The heat stroke-induced neuronal damage and diminished local cerebral blood flow in different brain structures, as well as the systemic hypotension, were attenuated in animals pretreated with IL-1ra (200 micrograms/kg, iv) 30 min before the onset of heat stroke. The results indicate that IL-1ra attenuates the heat stroke-induced cerebral neuronal damage by reducing cerebral ischemia in rats.
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PMID:Interleukin-1 receptor antagonist attenuates the heat stroke-induced neuronal damage by reducing the cerebral ischemia in rats. 767 Aug 83

There is increasing evidence that the inflammatory response plays an important role in CNS ischemia. The murine model of focal ischemia, however, remains incompletely characterized. In this study we examined expression of several cytokines and the vascular adhesion molecule E-selectin, in order to characterize the molecular events following stroke in the C57BL/6J mouse. Using a multi-probe RNAse protection assay (RPA), mRNA for 19 cytokines was analyzed following permanent and transient occlusion of the middle cerebral artery in mice. In addition, samples from the same mice were analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR) to evaluate E-selectin mRNA expression levels. Several cytokine mRNAs showed a similar expression pattern in both permanent and transient CNS ischemia while others showed a temporal expression pattern that was dependent on the type of stroke. For both models, mRNA levels of TNFalpha rose early (4 h) followed by IL-6 (10-18 h) and a comparatively late increase (96 h) in TGFbeta1. IL-1alpha, IL-1beta and IL-1ra levels showed a model dependent shift in temporal expression. Reperfusion appeared to delay the induction of these cytokines. Temporal changes in cytokine mRNA expression in the mouse CNS occur following ischemic damage. Our findings demonstrate the utility and power of multi-probe RPA for evaluation of changes in cytokine mRNA levels. Moreover, this study is, to our knowledge the first to show temporal changes in cytokine mRNA in mouse cerebral ischemia, forming a basis for further exploration of the roles of these cytokines in modulating ischemic neuronal damage in this model.
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PMID:Temporal modulation of cytokine expression following focal cerebral ischemia in mice. 1002 29

Interleukin-1 (IL-1) has been implicated in neuroimmune responses and has pleiotropic actions in the brain. Compelling evidence has shown that IL-1 is a major mediator of inflammation and the progression of cell death in response to brain injury and cerebral ischemia. Its expression is strongly increased in these pathological conditions, and central administration of exogenous IL-1 significantly exacerbates ischemic brain damage. In contrast, inhibiting IL-1 actions (by intracerebroventricular [icv] injection of IL-1ra, neutralizing antibody to IL-1 or caspase-1 inhibitor) significantly reduces ischemic brain damage. IL-1 acts by binding to the IL-1 type-I receptor (IL-1RI), which is to date, the only known functional receptor for IL-1. However, our recent investigations suggest that IL-1 can act independently of IL-1RI, raising the possibility that additional, as yet undiscovered, receptor(s) for IL-1 exist in the brain. The recent characterization of putative, new IL-1 ligands and new IL-1 receptor-related molecules leads to the hypothesis that there might be alternative IL-1 signaling pathway(s) in the central nervous system (CNS).
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PMID:The expanding interleukin-1 family and its receptors: do alternative IL-1 receptor/signaling pathways exist in the brain? 1284 50

In this study, we injected recombinant adeno-associated virus (rAAV) vectors expressing the interleukin-1 receptor antagonist (rAAV-IL-1ra) into the cortex of rats experiencing transient cerebral ischemia. An accumulation of IL-1ra in cortical tissues of rAAV-IL-1ra-injected animals was confirmed by ELISA. Triphenyltetrazolium chloride (TTC) staining of viable brain tissue revealed that the rAAV-delivered IL-1ra gene could rescue the brain tissues from ischemia-induced injury. Cortical tissues that received rAAV-IL-1ra injections had both significantly smaller total volumes of infarction as well as smaller areas of infarction on each brain slice when compared with the control models. In situ labeling analysis demonstrated significant reduction of apoptotic cells in cortical tissues rescued by rAAV-IL-1ra. Immunohistochemistry staining revealed that the rescued brain tissues contained the same levels of neuronal cells as contralateral undamaged brain tissues. These findings confirmed that the rAAV delivering the IL-1ra gene is a potential therapy for stroke.
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PMID:Gene treatment of cerebral stroke by rAAV vector delivering IL-1ra in a rat model. 1285 36

Interleukin-1 (IL-1) has pleiotropic actions in the central nervous system. During the past decade, a growing corpus of evidence has indicated an important role of this cytokine in the development of brain damage following cerebral ischaemia. The expression of IL-1 in the brain is dramatically increased during the early and chronic stage of infarction. The IL-1 gene cluster on chromosome 2ql4 contains three related genes (IL-1alpha, IL-1beta, and IL-1 receptor antagonist, IL-1ra) located within a 430-kb region. Polymorphisms in the genes encoding IL-1alpha, IL-1beta, and IL-1ra have been associated with several inflammatory diseases. Therefore we hypothesized that these cytokines might be good candidates for cerebral infarction (CI). We ascertained these genotypes in 363 CI patients and 640 controls matched for age and gender. A significant increase was found for the IL-1alpha (-889) allele 2 carriers in CI patients compared with controls (chi2 = 5.633, P = 0.018, odds ratio (OR) = 1.5). Furthermore, the IL-1alpha (-889) allele 2 carriers increased the relative risk for CI in the subjects without the IL-1ra allele 2 (chi2 = 7.989, P = 0.005, OR = 1.7). There was no significant association between IL-1beta (+3,953) polymorphism and CI. These results suggest that IL-1alpha-889 and IL-1ra polymorphisms are effective in the development of CI in Koreans.
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PMID:Interleukin-1 gene cluster polymorphisms in cerebral infarction. 1290 53

The inflammatory response accompanies and exacerbates the developing injury after cerebral ischemia. Ibuprofen, a non-steroidal anti-inflammatory drug, has been shown to attenuate injuries in animal models of various neurological diseases. In the present study, we investigated ibuprofen's neuroprotective effects in rats exposed to transient forebrain ischemia and in cultures exposed to oxygen glucose deprivation (OGD). Rats treated with ibuprofen after transient forebrain ischemia displayed long-lasting protection of CA1 hippocampal neurons. There were selective increases in interleukin-1 receptor antagonist gene and protein expression in ibuprofen-treated OGD microglia. Furthermore, treatment with ibuprofen in neuron/microglia co-cultures increased the number of surviving HC2S2 neurons against OGD whereas IL-1ra neutralizing antibody reversed the ibuprofen-induced neuroprotection. The data indicate that ibuprofen-induced IL-1ra secretion is involved in neuroprotection against ischemic conditions.
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PMID:Ibuprofen protects ischemia-induced neuronal injury via up-regulating interleukin-1 receptor antagonist expression. 1583 24

This review presents our experience and results concerning cerebral stroke gene therapy with a rat model subjected to rAAV-vector delivered IL-1ra and GDNF. The methodology involving the production of high-titer recombinant adeno-associated virus vectors in the absence of helper adenovirus and the creation of a tri-vessel ligation model of focal ischemic cerebral stroke in rats are described in detail. Furthermore, a literature review of other viral vectors, murine models of focal cerebral ischemia and candidates for therapeutic transgenes used for cerebral stroke gene therapy are presented. Lastly, the potentials and limitations of stroke gene therapy are discussed adding an analysis of possibilities of future experiment designs.
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PMID:Gene therapy of focal cerebral ischemia using defective recombinant adeno-associated virus vectors. 1672 Feb 92

Interleukin-1 (IL-1) has pleiotropic actions in the central nervous system. A growing corpus of evidence has indicated an important role of this cytokine in the development of brain damage following cerebral ischemia. The objective of this study is to investigate the influence of IL-1 cluster gene polymorphisms on the susceptibility of acute stroke and its outcomes in Egyptian patient. 320 patients with new or recurrent stroke [176 with atherothrombotic cerebral infarction, 79 with intracerebral hemorrhage (ICH), and 65 with subarachnoid hemorrhage (SAH)] and 320 controls were included in the study. IL-1b -511, IL-1a -889, and IL-1RN VNTR polymorphisms were analyzed using polymerase chain reaction-restriction fragment length polymorphism. Serum level of IL-1 was measured by enzyme linked immunosorbent assay. All patients were followed for neurological and functional impairments 7 days, 1, 3 and 6 months after the onset of the stroke. We found that IL-1b -511 gene polymorphisms were significantly increased in patients with atherothrombotic, intracerebral, and SAH. Subjects with IL-1a -889 CT and TT genotypes were significantly more likely to have atherothrombotic infarction. Both IL-1b -511, IL-1a -889 genes polymorphisms were significantly more likely to have severe neurological and functional impairment, while IL-1RN 2/2 genotype was significantly decreased in atherothrombotic infarction and ICH groups and showed less severe neurological and functional impairments 7 days, 1, 3, and 6 months after the onset of the stroke compared with carriers of the IL1RN 1/1 and 1/2 genotypes. We concluded that IL-1 cluster gene polymorphisms were associated with risk of acute stroke. IL-1b, IL-1a gene polymorphisms were associated with more severe functional and neurological impairments, while IL-1RN VNTR polymorphisms were associated with good outcomes.
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PMID:Influence of interleukin-1 gene cluster polymorphisms on the susceptibility and outcomes of acute stroke in Egyptian patients. 2522 42