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Fazio F, Ulivieri M, Volpi C, Gargaro M, Fallarino F. Targeting metabotropic glutamate receptors for the treatment of neuroinflammation. Curr Opin Pharmacol 2018; 38:16-23. [PMID: 29471184 DOI: 10.1016/j.coph.2018.01.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 01/31/2018] [Indexed: 12/15/2022]
Abstract
A large body of evidence suggests that neuroinflammation lies at the core of nearly all CNS disorders, including psychiatric disorders. Invading and local immune cells orchestrate the series of events that lead to either tissue repair or damage in response to neuroinflammation. Both lymphocytes and microglia express metabotropic glutamate (mGlu) receptors, which respond to glutamate or other endogenous activators (e.g. some kynurenine metabolites of tryptophan metabolism) influencing immune phenotype and the balance between pro-inflammatory and anti-inflammatory cytokines. Here, we offer an up-to-date on the role of individual mGlu receptor subtypes in the regulation of innate and adaptive immune response, highlighting the relevance of this information in the development of subtype-selective mGlu receptor ligands for treatment of CNS disorders.
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Affiliation(s)
| | - Martina Ulivieri
- Department of Physiology and Pharmacology, Sapienza University, Rome, Italy
| | - Claudia Volpi
- Department of Experimental Medicine, University of Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy
| | - Marco Gargaro
- Department of Experimental Medicine, University of Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy
| | - Francesca Fallarino
- Department of Experimental Medicine, University of Perugia, Polo Unico Sant'Andrea delle Fratte, Piazzale Gambuli, 06132 Perugia, Italy
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2
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Kim Y, Davidson JO, Gunn KC, Phillips AR, Green CR, Gunn AJ. Role of Hemichannels in CNS Inflammation and the Inflammasome Pathway. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2016; 104:1-37. [DOI: 10.1016/bs.apcsb.2015.12.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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3
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Lyman M, Lloyd DG, Ji X, Vizcaychipi MP, Ma D. Neuroinflammation: the role and consequences. Neurosci Res 2013; 79:1-12. [PMID: 24144733 DOI: 10.1016/j.neures.2013.10.004] [Citation(s) in RCA: 448] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 10/07/2013] [Accepted: 10/09/2013] [Indexed: 01/05/2023]
Abstract
Neuroinflammation is central to the common pathology of several acute and chronic brain diseases. This review examines the consequences of excessive and prolonged neuroinflammation, particularly its damaging effects on cellular and/or brain function, as well as its relevance to disease progression and possible interventions. The evidence gathered here indicates that neuroinflammation causes and accelerates long-term neurodegenerative disease, playing a central role in the very early development of chronic conditions including dementia. The wide scope and numerous complexities of neuroinflammation suggest that combinations of different preventative and therapeutic approaches may be efficacious.
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Affiliation(s)
- Monty Lyman
- Section of Anaesthetics, Pain Medicine & Intensive Care, Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, 369 Fulham Road, London SW10 9NH, UK
| | - Dafydd G Lloyd
- Section of Anaesthetics, Pain Medicine & Intensive Care, Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, 369 Fulham Road, London SW10 9NH, UK
| | - Xunming Ji
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Marcela P Vizcaychipi
- Section of Anaesthetics, Pain Medicine & Intensive Care, Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, 369 Fulham Road, London SW10 9NH, UK
| | - Daqing Ma
- Section of Anaesthetics, Pain Medicine & Intensive Care, Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, 369 Fulham Road, London SW10 9NH, UK.
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4
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Ceulemans AG, Zgavc T, Kooijman R, Hachimi-Idrissi S, Sarre S, Michotte Y. The dual role of the neuroinflammatory response after ischemic stroke: modulatory effects of hypothermia. J Neuroinflammation 2010; 7:74. [PMID: 21040547 PMCID: PMC2988764 DOI: 10.1186/1742-2094-7-74] [Citation(s) in RCA: 229] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Accepted: 11/01/2010] [Indexed: 12/15/2022] Open
Abstract
Neuroinflammation is a key element in the ischemic cascade after cerebral ischemia that results in cell damage and death in the subacute phase. However, anti-inflammatory drugs do not improve outcome in clinical settings suggesting that the neuroinflammatory response after an ischemic stroke is not entirely detrimental. This review describes the different key players in neuroinflammation and their possible detrimental and protective effects in stroke. Because of its inhibitory influence on several pathways of the ischemic cascade, hypothermia has been introduced as a promising neuroprotective strategy. This review also discusses the influence of hypothermia on the neuroinflammatory response. We conclude that hypothermia exerts both stimulating and inhibiting effects on different aspects of neuroinflammation and hypothesize that these effects are key to neuroprotection.
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Affiliation(s)
- An-Gaëlle Ceulemans
- Department of Pharmaceutical Chemistry and Drug Analysis, Research Group Experimental Neuropharmacology, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Brussels, Belgium
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5
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Braun A, Dang J, Johann S, Beyer C, Kipp M. Selective regulation of growth factor expression in cultured cortical astrocytes by neuro-pathological toxins. Neurochem Int 2009; 55:610-8. [PMID: 19524632 DOI: 10.1016/j.neuint.2009.06.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Revised: 06/02/2009] [Accepted: 06/03/2009] [Indexed: 12/14/2022]
Abstract
Astrocytes are integrated in the complex regulation of neurodegeneration and neuronal damage in the CNS. It is well-known that astroglia produces a plethora of growth factors which might be protective for neurons. Growth factors prevent neurons from cell death and promote proliferation and differentiation of precursor cells. Previous data suggest that astrocytes may respond to toxic stimuli by a selective mobilization of guarding molecules. In the present study, we have investigated the potency of different pathological stimuli such as lipopolysaccharides, tumor necrosis factor alpha, glutamate, and hydrogen peroxide to activate cultured cortical astroglia and stimulate growth factor expression. Astroglial cultures were exposed to the above factors for 24h at non-toxic concentrations for astrocytes. Growth factor expression was analyzed by real-time PCR, oligo-microarray technique, and ELISA. Insulin-like growth factor-1 was selectively down-regulated by lipopolysaccharides and tumor necrosis factor alpha, bone morphogenetic protein 6 by all stimuli. In contrast, lipopolysaccharides, tumor necrosis factor alpha, and glutamate increased leukemia inhibitory factor. Fibroblast growth factor 2 was up-regulated by lipopolysaccharides and tumor necrosis factor alpha and down-regulated by hydrogen peroxide. Besides hydrogen peroxide, all other stimuli promoted vascular epithelial growth factor A mRNA and protein expression. It appears that lipopolysaccharides but not tumor necrosis factor alpha effects on vascular epithelial growth factor A depend on the classic NFkappaB pathway. Our data clearly demonstrate that astroglia actively responses to diverse pathological compounds by a selective expression pattern of growth factors. These findings make astrocytes likely candidates to participate in disease-specific characteristics of neuronal support or damage.
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Affiliation(s)
- Alena Braun
- Institute of Neuroanatomy, RWTH Aachen University, Germany
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6
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Cytokines in Synaptic Function. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1567-7443(07)10007-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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7
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Stone TW, Behan WMH. Interleukin-1β but not tumor necrosis factor-α potentiates neuronal damage by quinolinic acid: Protection by an adenosine A2A receptor antagonist. J Neurosci Res 2007; 85:1077-85. [PMID: 17304576 DOI: 10.1002/jnr.21212] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Quinolinic acid is an agonist at glutamate receptors sensitive to N-methyl-D-aspartate (NMDA). It has been implicated in neural dysfunction associated with infections, trauma, and ischemia, although its neurotoxic potency is relatively low. This study was designed to examine the effects of a combination of quinolinic acid and the proinflammatory cytokines interleukin-1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha). Compounds were administered to the hippocampus of anesthetized male rats, animals being allowed to recover for 7 days before histological analysis of the hippocampus for neuronal damage estimated by counting of intact, healthy neurons. A low dose of quinolinic acid or IL-1beta produced no damage by itself, but the two together induced a significant loss of pyramidal neurons in the hippocampus. Higher doses produced almost total loss of pyramidal cells. Intrahippocampal TNF-alpha produced no effect alone but significantly reduced the neuronal loss produced by quinolinic acid. The adenosine A(2A) receptor antagonist ZM241385 reduced neuronal loss produced by the combinations of quinolinic acid and IL-1beta. The results suggest that simultaneous quinolinic acid and IL-1beta, both being induced by cerebral infection or injury, are synergistic in the production of neuronal damage and could together contribute substantially to traumatic, infective, or ischemic cerebral damage. Antagonism of adenosine A(2A) receptors protects neurons against the combination of quinolinic acid and IL-1beta.
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Affiliation(s)
- Trevor W Stone
- Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, United Kingdom.
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8
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Choi SJ, Lee KH, Park HS, Kim SK, Koh CM, Park JY. Differential expression, shedding, cytokine regulation and function of TNFR1 and TNFR2 in human fetal astrocytes. Yonsei Med J 2005; 46:818-26. [PMID: 16385659 PMCID: PMC2810597 DOI: 10.3349/ymj.2005.46.6.818] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Tumor necrosis factor (TNF)-alpha induces pleiotropic cellular effects through a 55kDa, type 1 receptor (TNFR1) and a 75kDa type 2 receptor (TNFR2). Moreover, it participates in the pathogenesis of several CNS diseases, including demyelinating diseases. TNF-alpha receptors are differentially expressed and are regulated in many cell types. However, data regarding the TNF-alpha receptor expression and regulation in human astrocytes is limited to date. We investigated TNF- receptor expression, its regulation by cytokines, and its functional role in primary cultured human fetal astrocytes, which are the most abundant cellular population in the central nervous system and are known to be immunologically active. In this study, astrocytes were found to constitutively and predominantly transcribe, translate and shed TNFR1 rather than TNFR2, but TNFR2 expression was increased by adding TNF-alpha, IL-1, and IFN-gamma, but not by adding LPS. To determine the functional roles of TNFR1 and TNFR2 on TNF induction, we investigated NF-kappaB activation and TNF-alpha induction after neutralizing TNFR1 and TNFR2 by an antibody treatment. We found that NF-kappaB activation and TNF-alpha induction are blocked by TNFR1 neutralizing antibody treatments.
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MESH Headings
- Astrocytes/drug effects
- Astrocytes/metabolism
- Cells, Cultured
- Cytokines/pharmacology
- Fetus/cytology
- Gene Expression Regulation
- Humans
- NF-kappa B/metabolism
- RNA, Messenger/metabolism
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Receptors, Tumor Necrosis Factor, Type I/physiology
- Receptors, Tumor Necrosis Factor, Type II/genetics
- Receptors, Tumor Necrosis Factor, Type II/metabolism
- Receptors, Tumor Necrosis Factor, Type II/physiology
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Affiliation(s)
- Sun Ju Choi
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Kyoung-Ho Lee
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Hyun Sook Park
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Soo-Ki Kim
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Choon-Myung Koh
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Joo Young Park
- Department of Microbiology, Institute of Basic Medical Science, Yonsei University Wonju College of Medicine, Wonju, Korea
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De A, Krueger JM, Simasko SM. Glutamate induces the expression and release of tumor necrosis factor-alpha in cultured hypothalamic cells. Brain Res 2005; 1053:54-61. [PMID: 16040010 DOI: 10.1016/j.brainres.2005.06.044] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Revised: 06/07/2005] [Accepted: 06/07/2005] [Indexed: 10/25/2022]
Abstract
Tumor necrosis factor-alpha (TNFalpha) affects several CNS functions such as regulation of sleep, body temperature, and feeding during pathology. There is also evidence for TNFalpha involvement in physiological sleep regulation, e.g., TNFalpha induces sleep and brain levels of TNFalpha increase during prolonged wakefulness. The immediate cause of enhanced TNFalpha production in brain is unknown. We investigated whether glutamate could signal TNFalpha production because glutamate is a neurotransmitter associated with cell activation and wakefulness. We used primary cultures of fetal rat hypothalamic cells to examine the expression and release of TNFalpha. Immunostaining for neuron specific enolase revealed that the cultures were 50-60% neuronal and 40-50% non-neuronal cells. TNFalpha was detected in both the media and cells under basal conditions. Stimulation of the cells with 1 mM glutamate for 2 h produced an increase in media content of TNFalpha, whereas cell content was elevated at earlier time points. Using trypan blue exclusion and MTT assays, there was no evidence of cell toxicity with this stimulation protocol. Immunocytochemical staining revealed that TNFalpha was expressed by approximately 25% of the neurons and approximately 75% of the glial cell in the culture. Stimulation of the cultures with glutamate did not increase the percentage of cells expressing TNFalpha. We conclude that TNFalpha is constitutively expressed and released by healthy cultures of hypothalamic cells and that activation of the cells with a non-toxic challenge of glutamate increases TNFalpha production. These findings support the hypothesis that TNFalpha can participate in normal physiological regulation of sleep and feeding.
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Affiliation(s)
- Alok De
- Program in Neuroscience, Department of VCAPP, College of Veterinary Medicine, Washington State University, 205 Wegner Hall, Pullman, WA 99164-6520, USA
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Balosso S, Ravizza T, Perego C, Peschon J, Campbell IL, De Simoni MG, Vezzani A. Tumor necrosis factor-alpha inhibits seizures in mice via p75 receptors. Ann Neurol 2005; 57:804-12. [PMID: 15852477 DOI: 10.1002/ana.20480] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Brain inflammatory reactions have been described in various neurological disorders, including epilepsy. Although there is clear evidence that cytokines affect neuroglial functions and blood-brain barrier permeability, scarce information is available on the functional consequences of brain inflammation on seizures. We studied the role of tumor necrosis factor-alpha (TNF)-alpha and its p55 and p75 receptors in seizure modulation. We found that intrahippocampal injection of murine recombinant TNF-alpha potently inhibits seizure in mice while human recombinant TNF-alpha, which shows strong specificity for mouse p55 receptors, was ineffective. p75 receptors were detected in mouse hippocampal neurons, whereas p55 receptors were absent. Transgenic mice with a perturbed TNF-alpha system showed profound alterations in seizure susceptibility: astrocytic overexpression of TNF-alpha was associated with reduced seizures, whereas mice lacking TNF-alpha p75 or both p55 and p75, receptors showed prolonged seizures. Mice deficient in p55 receptor only showed reduced seizures; and both p75 and TNF receptor-associated factor 2 protein levels were upregulated in their hippocampi. Our findings show that increased brain levels of TNF-alpha result in significant inhibition of seizures in mice, and this action is mediated by neuronal p75 receptors. This evidence highlights a novel function of TNF-alpha in brain and indicates a new system for anticonvulsive intervention.
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MESH Headings
- Animals
- Anticonvulsants/pharmacology
- Electroencephalography
- Epilepsy/chemically induced
- Epilepsy/drug therapy
- Epilepsy/physiopathology
- Excitatory Amino Acid Agonists
- Gene Expression
- Hippocampus/physiology
- Kainic Acid
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Receptors, Tumor Necrosis Factor, Type II/genetics
- Receptors, Tumor Necrosis Factor, Type II/metabolism
- Tumor Necrosis Factor-alpha/pharmacology
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Affiliation(s)
- Silvia Balosso
- Department of Neuroscience, Mario Negri Institute for Pharmacological Research, Milano, Italy
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11
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De A, Krueger JM, Simasko SM. Tumor necrosis factor alpha increases cytosolic calcium responses to AMPA and KCl in primary cultures of rat hippocampal neurons. Brain Res 2003; 981:133-42. [PMID: 12885434 DOI: 10.1016/s0006-8993(03)02997-4] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Acute behavioral effects of tumor necrosis factor alpha (TNFalpha) have been previously reported, however the cellular basis for these actions are unknown. To address this issue we examined the effects of TNFalpha on AMPA- and depolarization-induced changes in cytosolic Ca(2+) in cultured hippocampal neurons. Single cell Ca(2+) levels were determined with the fluorescent calcium indicator fura-2. TNFalpha caused an up-regulation of AMPA (10 microM)- and depolarization (55 mM KCl)-induced Ca(2+) responses. This effect occurred within a window of concentrations (1 and 10 ng/ml but not 0.1 or 100 ng/ml) and times (3 and 6 h but not 1 and 24 h). The effect was dependent upon protein synthesis (blocked by cycloheximide) and was prevented by the soluble TNF receptor and by a soluble TNF receptor fragment. Treatment with the soluble TNF receptor fragment also caused a decrease in the basal response. The TNFalpha treatment protocols did not appear to produce any toxicity to the neurons. Results are consistent with the hypothesis that TNFalpha regulates proteins known to be involved in neuronal communication (AMPA receptors) and cell regulation (voltage-dependent calcium channels) in a relatively rapid period of time (a few hours). These actions may be related to the behavioral effects produced by TNFalpha that occur within this time frame.
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Affiliation(s)
- Alok De
- Program in Neuroscience, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, 205 Wegner Hall, Pullman, WA 99164-6520, USA
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12
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Reply to Tremolizzo et al., ‘Glutamate may be the soluble cerebrospinal fluid factor that induces calcium dysregulation in cultured astrocytes in HIV dementia'. AIDS 2002. [DOI: 10.1097/00002030-200208160-00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Köller H, Schaal H, Freund M, Garrido SR, von Giesen HJ, Ott M, Rosenbaum C, Arendt G. HIV-1 protein Tat reduces the glutamate-induced intracellular Ca2+ increase in cultured cortical astrocytes. Eur J Neurosci 2001; 14:1793-9. [PMID: 11860474 DOI: 10.1046/j.0953-816x.2001.01808.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The trans-activator protein Tat of the human immunodeficiency virus type 1 (HIV-1) is regarded as an injurious molecule in the pathogenesis of HIV-1 associated encephalopathy (HIVE). We investigated the effects of Tat on neuroligand-induced intracellular Ca2+ increase in cultured astroglial cells. Rat cortical astrocytes, human glioblastoma cells and glial restricted precursor cells, from a human embryonic teratocarcinoma cell line, were incubated with recombinant Tat (100 ng/mL for 60 min) which induced a significant reduction of glutamate or ATP-induced intracellular Ca2+ increase ("glutamate response", "ATP response"). The reduction of the glutamate response was also observed following cell incubation with cell extracts of HeLa-T4+ cells transiently transfected with an expression plasmid coding for Tat. However, inactivation of the transcriptional trans-activity of Tat, by using a mutant form of Tat, as well as inhibition of de novo protein synthesis by cycloheximide abolished the effect on the glutamate response. This suggests that Tat acts upon induction of a so far unknown cellular gene whose gene product causes the reduction of glutamate responses. As the effect of Tat resembles the effect of TNFalpha on glutamate responses [Köller et al. (2001) Brain Res., 893, 237-243] which is locally released within the brains of HIVE patients, we also tested for synergistic effects of Tat and TNFalpha on the glutamate response. Low concentrations of Tat in combination with subthreshold concentrations of TNFalpha also elicited a marked reduction of astroglial glutamate responses. Our data suggest that Tat and TNFalpha, both by itself and synergistically, induce astroglial dysfunction.
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MESH Headings
- AIDS Dementia Complex/metabolism
- AIDS Dementia Complex/physiopathology
- Adenosine Triphosphate/metabolism
- Adenosine Triphosphate/pharmacology
- Animals
- Animals, Newborn
- Astrocytes/drug effects
- Astrocytes/metabolism
- Astrocytes/virology
- Calcium/metabolism
- Cell Extracts/pharmacology
- Central Nervous System/metabolism
- Central Nervous System/physiopathology
- Central Nervous System/virology
- Dose-Response Relationship, Drug
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/genetics
- Gene Expression Regulation, Viral/drug effects
- Gene Expression Regulation, Viral/genetics
- Gene Products, tat/genetics
- Gene Products, tat/metabolism
- Gene Products, tat/pharmacology
- Glutamic Acid/metabolism
- Glutamic Acid/pharmacology
- HIV-1/genetics
- HIV-1/metabolism
- Intracellular Fluid/drug effects
- Intracellular Fluid/metabolism
- Intracellular Fluid/virology
- Rats
- Rats, Wistar
- Tumor Cells, Cultured
- Tumor Necrosis Factor-alpha/genetics
- Tumor Necrosis Factor-alpha/metabolism
- Tumor Necrosis Factor-alpha/pharmacology
- tat Gene Products, Human Immunodeficiency Virus
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Affiliation(s)
- H Köller
- Department of Neurology and Institute of Medical Microbiology and Virology, Heinrich-Heine-University, PO Box 101007, D-40001 Düsseldorf, Germany.
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Abstract
Cytokines have been implicated as mediators and inhibitors of diverse forms of neurodegeneration. They are induced in response to brain injury and have diverse actions that can cause, exacerbate, mediate and/or inhibit cellular injury and repair. Here we review evidence for the contribution of cytokines to acute neurodegeneration, focusing primarily on interleukin 1 (IL-1), tumour necrosis factor-alpha (TNFalpha) and transforming growth factor-beta (TGFbeta). TGFbeta seems to exert primarily neuroprotective actions, whereas TNFalpha might contribute to neuronal injury and exert protective effects. IL-1 mediates ischaemic, excitotoxic and traumatic brain injury, probably through multiple actions on glia, neurons and the vasculature. Understanding cytokine action in acute neurodegeneration could lead to novel and effective therapeutic strategies, some of which are already in clinical trials.
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Köller H, von Giesen HJ, Schaal H, Arendt G. Soluble cerebrospinal fluid factors induce Ca2+ dysregulation in rat cultured cortical astrocytes in HIV-1-associated dementia complex. AIDS 2001; 15:1789-92. [PMID: 11579240 DOI: 10.1097/00002030-200109280-00007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To investigate the effect of cerebrospinal fluid (CSF) of HIV-1-seropositive patients with and without HIV-1-associated dementia complex (HADC) on the intracellular Ca2+ regulation of cultured cortical astrocytes. DESIGN In a blinded study the effects of CSF samples from HADC patients and from HIV-1-seropositive but not demented patients on intracellular Ca2+ regulation of cultured cortical astrocytes were investigated. Astrocytes were chosen because they contribute to both electrophysiological and immunological processes within the brain. METHODS Astrocytes were incubated in CSF samples for 1 h, loaded with the Ca2+ indicator dye Fura-2 and intracellular Ca2+ responses upon glutamate application were measured. RESULTS CSF samples from 10 out of 11 HADC patients induced a significant reduction of the intracellular Ca2+ increase upon glutamate application. On the contrary, seven out of 10 CSF samples from HIV-1-seropositive patients without HADC as well as 10 out of 10 CSF samples from HIV-1-seronegative controls did not affect the intracellular Ca2+ response. CONCLUSIONS Our data strongly confirm the hypothesis that CSF samples of HADC patients contain soluble factors which interfere with the function of astrocytes. These factors may include HIV-1 proteins, locally released cytokines or neurotoxins.
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Affiliation(s)
- H Köller
- Department of Neurology and the aInstitute of Medical Microbiology and Virology, Heinrich-Heine-University, Düsseldorf, Germany
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