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Badaut J, Blochet C, Obenaus A, Hirt L. Physiological and pathological roles of caveolins in the central nervous system. Trends Neurosci 2024; 47:651-664. [PMID: 38972795 PMCID: PMC11324375 DOI: 10.1016/j.tins.2024.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 05/14/2024] [Accepted: 06/12/2024] [Indexed: 07/09/2024]
Abstract
Caveolins are a family of transmembrane proteins located in caveolae, small lipid raft invaginations of the plasma membrane. The roles of caveolin-enriched lipid rafts are diverse, and include mechano-protection, lipid homeostasis, metabolism, transport, and cell signaling. Caveolin-1 (Cav-1) and other caveolins were described in endothelial cells and later in other cell types of the central nervous system (CNS), including neurons, astrocytes, oligodendrocytes, microglia, and pericytes. This pancellular presence of caveolins demands a better understanding of their functional roles in each cell type. In this review we describe the various functions of Cav-1 in the cells of normal and pathological brains. Several emerging preclinical findings suggest that Cav-1 could represent a potential therapeutic target in brain disorders.
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Affiliation(s)
- Jérôme Badaut
- CNRS UMR 5536 RMSB-University of Bordeaux, Bordeaux, France; Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, CA, USA.
| | - Camille Blochet
- Department of Clinical Neurosciences, CHUV, Lausanne, Switzerland; Department of Fundamental Neuroscience, University of Lausanne, Lausanne, Switzerland
| | - André Obenaus
- Department of Basic Sciences, Loma Linda University School of Medicine, Loma Linda, CA, USA; Division of Biomedical Sciences, University of California Riverside, Riverside, CA, USA
| | - Lorenz Hirt
- Department of Clinical Neurosciences, CHUV, Lausanne, Switzerland; Department of Fundamental Neuroscience, University of Lausanne, Lausanne, Switzerland
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2
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Islam M, Behura SK. Role of caveolin-1 in metabolic programming of fetal brain. iScience 2023; 26:107710. [PMID: 37720105 PMCID: PMC10500482 DOI: 10.1016/j.isci.2023.107710] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/10/2023] [Accepted: 08/23/2023] [Indexed: 09/19/2023] Open
Abstract
Mice lacking caveolin-1 (Cav1), a key protein of plasma membrane, exhibit brain aging at an early adult stage. Here, integrative analyses of metabolomics, transcriptomics, epigenetics, and single-cell data were performed to test the hypothesis that metabolic deregulation of fetal brain due to the ablation of Cav1 is linked to brain aging in these mice. The results of this study show that lack of Cav1 caused deregulation in the lipid and amino acid metabolism in the fetal brain, and genes associated with these deregulated metabolites were significantly altered in the brain upon aging. Moreover, ablation of Cav1 deregulated several metabolic genes in specific cell types of the fetal brain and impacted DNA methylation of those genes in coordination with mouse epigenetic clock. The findings of this study suggest that the aging program of brain is confounded by metabolic abnormalities in the fetal stage due to the absence of Cav1.
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Affiliation(s)
- Maliha Islam
- Division of Animal Sciences, 920 East Campus Drive, University of Missouri, Columbia, MO 65211, USA
| | - Susanta K. Behura
- Division of Animal Sciences, 920 East Campus Drive, University of Missouri, Columbia, MO 65211, USA
- MU Institute for Data Science and Informatics, University of Missouri, Columbia, MO, USA
- Interdisciplinary Reproduction and Health Group, University of Missouri, Columbia, MO, USA
- Interdisciplinary Neuroscience Program, University of Missouri, Columbia, MO, USA
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3
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Lee JH, Han JH, Woo JH, Jou I. 25-Hydroxycholesterol suppress IFN-γ-induced inflammation in microglia by disrupting lipid raft formation and caveolin-mediated signaling endosomes. Free Radic Biol Med 2022; 179:252-265. [PMID: 34808332 DOI: 10.1016/j.freeradbiomed.2021.11.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 01/25/2023]
Abstract
Acute microglial activation plays an important role in neuroprotection. However, dysregulated, prolonged microgliosis exacerbates neurodegeneration through excessive release of pro-inflammatory cytokines and cytotoxic factors. Interferon-gamma (IFN-γ), an inflammatory cytokine, exacerbates the detrimental microglial response. Although various anti-inflammatory drugs have been evaluated as interventions for microglia-mediated neuroinflammation, no anti-inflammatories are in clinical use for microgliosis. The present study evaluated the anti-inflammatory mechanisms of oxysterols, blood brain barrier (BBB) penetrable bioactive lipids, revealing that this intervention suppresses neuroinflammation by disrupting membrane lipid raft formation and caveolae-mediated endosomal IFN-γ signaling. We find that 25-hydroxycholesterol (25-HC) rapidly repressed IFN-γ receptor trafficking to lipid rafts in microglia by disrupting raft formation, thereby suppressing microglial inflammatory response. IFN-γ treatment upregulated expression of Cav-1, a major component of caveolae, and IFN-γ signaling was sustained through Cav-1+ signaling endosomes. 25-HC repressed IFN-γ induction of Cav-1 expression in microglia, and subsequently suppressed the chronic inflammatory response. Taken together, these findings demonstrated that 25-HC effectively regulate the inflammatory status of microglia by mediating the formation of rafts and caveolae-dependent signaling endosomes. Given the important roles of IFN-γ and microglia in the pathology of neurodegenerative brain diseases, a novel anti-inflammatory mechanism of 25-HC that is not receptor-dependent, but rather is related to the regulation of membrane rafts and caveolae, suggests a new therapeutic target for inflammatory neurodegenerations.
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Affiliation(s)
- Jee Hoon Lee
- Department of Pharmacology, Ajou University School of Medicine, Suwon, South Korea; Inflamm-aging Translational Research Center, Ajou University School of Medicine, Suwon, South Korea.
| | - Ji-Hye Han
- Department of Pharmacology, Ajou University School of Medicine, Suwon, South Korea; Inflamm-aging Translational Research Center, Ajou University School of Medicine, Suwon, South Korea
| | - Joo Hong Woo
- Department of Pharmacology, Ajou University School of Medicine, Suwon, South Korea; Inflamm-aging Translational Research Center, Ajou University School of Medicine, Suwon, South Korea
| | - Ilo Jou
- Department of Pharmacology, Ajou University School of Medicine, Suwon, South Korea; Inflamm-aging Translational Research Center, Ajou University School of Medicine, Suwon, South Korea.
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Guan W, Xia M, Ji M, Chen B, Li S, Zhang M, Liang S, Chen B, Gong W, Dong C, Wen G, Zhan X, Zhang D, Li X, Zhou Y, Guan D, Verkhratsky A, Li B. Iron induces two distinct Ca 2+ signalling cascades in astrocytes. Commun Biol 2021; 4:525. [PMID: 33953326 PMCID: PMC8100120 DOI: 10.1038/s42003-021-02060-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 03/30/2021] [Indexed: 02/06/2023] Open
Abstract
Iron is the fundamental element for numerous physiological functions. Plasmalemmal divalent metal ion transporter 1 (DMT1) is responsible for cellular uptake of ferrous (Fe2+), whereas transferrin receptors (TFR) carry transferrin (TF)-bound ferric (Fe3+). In this study we performed detailed analysis of the action of Fe ions on cytoplasmic free calcium ion concentration ([Ca2+]i) in astrocytes. Administration of Fe2+ or Fe3+ in μM concentrations evoked [Ca2+]i in astrocytes in vitro and in vivo. Iron ions trigger increase in [Ca2+]i through two distinct molecular cascades. Uptake of Fe2+ by DMT1 inhibits astroglial Na+-K+-ATPase, which leads to elevation in cytoplasmic Na+ concentration, thus reversing Na+/Ca2+ exchanger and thereby generating Ca2+ influx. Uptake of Fe3+ by TF-TFR stimulates phospholipase C to produce inositol 1,4,5-trisphosphate (InsP3), thus triggering InsP3 receptor-mediated Ca2+ release from endoplasmic reticulum. In summary, these findings reveal the mechanisms of iron-induced astrocytic signalling operational in conditions of iron overload.
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Affiliation(s)
- Wenzheng Guan
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- The First Department of Reproduction, Shengjing Hospital, China Medical University, Shenyang, China
| | - Maosheng Xia
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Orthopaedics, The First Hospital, China Medical University, Shenyang, PR China
| | - Ming Ji
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Beina Chen
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Shuai Li
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Manman Zhang
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Shanshan Liang
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Binjie Chen
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Wenliang Gong
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Chengyi Dong
- Department of Orthopaedics, The First Hospital, China Medical University, Shenyang, PR China
| | - Gehua Wen
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Xiaoni Zhan
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Dianjun Zhang
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Xinyu Li
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China
| | - Yuefei Zhou
- Department of Orthopaedics, The First Hospital, China Medical University, Shenyang, PR China
| | - Dawei Guan
- Department of Forensic Pathology, School of Forensic Medicine, China Medical University, Shenyang, China.
| | - Alexei Verkhratsky
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China.
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.
- Achucarro Center for Neuroscience, IKERBASQUE, Bilbao, Spain.
- Sechenov First Moscow State Medical University, Moscow, Russia.
| | - Baoman Li
- Practical Teaching Centre, School of Forensic Medicine, China Medical University, Shenyang, PR China.
- Department of Forensic Analytical Toxicology, School of Forensic Medicine, China Medical University, Shenyang, China.
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Role of Caveolin-1 in Diabetes and Its Complications. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:9761539. [PMID: 32082483 PMCID: PMC7007939 DOI: 10.1155/2020/9761539] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/10/2019] [Accepted: 12/26/2019] [Indexed: 12/25/2022]
Abstract
It is estimated that in 2017 there were 451 million people with diabetes worldwide. These figures are expected to increase to 693 million by 2045; thus, innovative preventative programs and treatments are a necessity to fight this escalating pandemic disorder. Caveolin-1 (CAV1), an integral membrane protein, is the principal component of caveolae in membranes and is involved in multiple cellular functions such as endocytosis, cholesterol homeostasis, signal transduction, and mechanoprotection. Previous studies demonstrated that CAV1 is critical for insulin receptor-mediated signaling, insulin secretion, and potentially the development of insulin resistance. Here, we summarize the recent progress on the role of CAV1 in diabetes and diabetic complications.
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Li B, Jia S, Yue T, Yang L, Huang C, Verkhratsky A, Peng L. Biphasic Regulation of Caveolin-1 Gene Expression by Fluoxetine in Astrocytes: Opposite Effects of PI3K/AKT and MAPK/ERK Signaling Pathways on c-fos. Front Cell Neurosci 2017; 11:335. [PMID: 29163047 PMCID: PMC5671492 DOI: 10.3389/fncel.2017.00335] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 10/11/2017] [Indexed: 11/13/2022] Open
Abstract
Previously, we reported that fluoxetine acts on 5-HT2B receptor and induces epidermal growth factor receptor (EGFR) transactivation in astrocytes. Recently, we have found that chronic treatment with fluoxetine regulates Caveolin-1 (Cav-1)/PTEN/PI3K/AKT/glycogen synthase kinase 3β (GSK-3β) signaling pathway and glycogen content in primary cultures of astrocytes with bi-phasic concentration dependence. At low concentrations fluoxetine down-regulates Cav-1 gene expression, decreases membrane content of PTEN, increases PI3K activity and increases phosphorylation of GSK-3β and increases its activity; at high concentrations fluoxetine acts on PTEN/PI3K/AKT/GSK-3β in an inverse fashion. Here, we present the data indicating that acute treatment with fluoxetine at lower concentrations down-regulates c-Fos gene expression via PI3K/AKT signaling pathway; in contrast at higher concentrations fluoxetine up-regulates c-Fos gene expression via MAPK/extracellular-regulated kinase (ERK) signaling pathway. However, acute treatment with fluoxetine has no effect on Cav-1 protein content. Similarly, chronic effects of fluoxetine on Cav-1 gene expression are suppressed by inhibitor of PI3K at lower concentrations, but by inhibitor of MAPK at higher concentrations, indicating that the mechanism underlying bi-phasic regulation of Cav-1 gene expression by fluoxetine is opposing effects of PI3K/AKT and MAPK/ERK signal pathways on c-Fos gene expression. The effects of fluoxetine on Cav-1 gene expression at both lower and higher concentrations are abolished by AG1478, an inhibitor of EGFR, indicating the involvement of 5-HT2B receptor induced EGFR transactivation as we reported previously. However, PP1, an inhibitor of Src only abolished the effect by lower concentrations, suggesting the relevance of Src with PI3K/AKT signal pathway during activation of EGFR.
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Affiliation(s)
- Baoman Li
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
| | - Shu Jia
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
| | - Tingting Yue
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
| | - Li Yang
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
| | - Chen Huang
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
| | - Alexej Verkhratsky
- Faculty of Life Science, The University of Manchester, Manchester, United Kingdom.,Achucarro Center for Neuroscience, IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
| | - Liang Peng
- Laboratory of Metabolic Brain Diseases, Institute of Metabolic Disease Research and Drug Development, China Medical University, Shenyang, China
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Martinez NA, Ayala AM, Martinez M, Martinez-Rivera FJ, Miranda JD, Silva WI. Caveolin-1 Regulates the P2Y2 Receptor Signaling in Human 1321N1 Astrocytoma Cells. J Biol Chem 2016; 291:12208-22. [PMID: 27129210 DOI: 10.1074/jbc.m116.730226] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Indexed: 11/06/2022] Open
Abstract
Damage to the CNS can cause a differential spatio-temporal release of multiple factors, such as nucleotides, ATP and UTP. The latter interact with neuronal and glial nucleotide receptors. The P2Y2 nucleotide receptor (P2Y2R) has gained prominence as a modulator of gliotic responses after CNS injury. Still, the molecular mechanisms underlying these responses in glia are not fully understood. Membrane-raft microdomains, such as caveolae, and their constituent caveolins, modulate receptor signaling in astrocytes; yet, their role in P2Y2R signaling has not been adequately explored. Hence, this study evaluated the role of caveolin-1 (Cav-1) in modulating P2Y2R subcellular distribution and signaling in human 1321N1 astrocytoma cells. Recombinant hP2Y2R expressed in 1321N1 cells and Cav-1 were found to co-fractionate in light-density membrane-raft fractions, co-localize via confocal microscopy, and co-immunoprecipitate. Raft localization was dependent on ATP stimulation and Cav-1 expression. This hP2Y2R/Cav-1 distribution and interaction was confirmed with various cell model systems differing in the expression of both P2Y2R and Cav-1, and shRNA knockdown of Cav-1 expression. Furthermore, shRNA knockdown of Cav-1 expression decreased nucleotide-induced increases in the intracellular Ca(2+) concentration in 1321N1 and C6 glioma cells without altering TRAP-6 and carbachol Ca(2+) responses. In addition, Cav-1 shRNA knockdown also decreased AKT phosphorylation and altered the kinetics of ERK1/2 activation in 1321N1 cells. Our findings strongly suggest that P2Y2R interaction with Cav-1 in membrane-raft caveolae of 1321N1 cells modulates receptor coupling to its downstream signaling machinery. Thus, P2Y2R/Cav-1 interactions represent a novel target for controlling P2Y2R function after CNS injury.
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Affiliation(s)
| | | | | | - Freddyson J Martinez-Rivera
- Anatomy and Neurobiology, School of Medicine, University of Puerto Rico, Medical Sciences Campus, San Juan, Puerto Rico 00936
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Xu L, Wang L, Wen Z, Wu L, Jiang Y, Yang L, Xiao L, Xie Y, Ma M, Zhu W, Ye R, Liu X. Caveolin-1 is a checkpoint regulator in hypoxia-induced astrocyte apoptosis via Ras/Raf/ERK pathway. Am J Physiol Cell Physiol 2016; 310:C903-10. [PMID: 27009876 DOI: 10.1152/ajpcell.00309.2015] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 03/17/2016] [Indexed: 01/27/2023]
Abstract
Astrocytes, the most numerous cells in the human brain, play a central role in the metabolic homeostasis following hypoxic injury. Caveolin-1 (Cav-1), a transmembrane scaffolding protein, has been shown to converge prosurvival signaling in the central nerve system. The present study aimed to investigate the role of Cav-1 in the hypoxia-induced astrocyte injury. We also examined how Cav-1 alleviates apoptotic astrocyte death. To this end, primary astrocytes were exposed to oxygen-glucose deprivation (OGD) for 6 h and a subsequent 24-h reoxygenation to mimic hypoxic injury. OGD significantly reduced Cav-1 expression. Downregulation of Cav-1 using Cav-1 small interfering RNA dramatically worsened astrocyte cell damage and impaired cellular glutamate uptake after OGD, whereas overexpression of Cav-1 with Cav-1 scaffolding domain peptide attenuated OGD-induced cell apoptosis. Mechanistically, the expressions of Ras-GTP, phospho-Raf, and phospho-ERK were sequestered in Cav-1 small interfering RNA-treated astrocytes, yet were stimulated after supplementation with caveolin peptide. MEK/ERK inhibitor U0126 remarkably blocked the Cav-1-induced counteraction against apoptosis following hypoxia, indicating Ras/Raf/ERK pathway is required for the Cav-1's prosurvival role. Together, these findings support Cav-1 as a checkpoint for the in hypoxia-induced astrocyte apoptosis and warrant further studies targeting Cav-1 to treat hypoxic-ischemic brain injury.
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Affiliation(s)
- Lili Xu
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Liumin Wang
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Zhuoyu Wen
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Li Wu
- Institute of Neuroscience, the Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong Province, China; and
| | - Yongjun Jiang
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Lian Yang
- Department of Neurology, the Central Hospital of Shaoyang, Shaoyang, Hunan Province, China
| | - Lulu Xiao
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Yi Xie
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Minmin Ma
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Wusheng Zhu
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Ruidong Ye
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China
| | - Xinfeng Liu
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu Province, China;
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Niesman IR, Schilling JM, Shapiro LA, Kellerhals SE, Bonds JA, Kleschevnikov AM, Cui W, Voong A, Krajewski S, Ali SS, Roth DM, Patel HH, Patel PM, Head BP. Traumatic brain injury enhances neuroinflammation and lesion volume in caveolin deficient mice. J Neuroinflammation 2014; 11:39. [PMID: 24593993 PMCID: PMC3975903 DOI: 10.1186/1742-2094-11-39] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 02/10/2014] [Indexed: 11/30/2022] Open
Abstract
Background Traumatic brain injury (TBI) enhances pro-inflammatory responses, neuronal loss and long-term behavioral deficits. Caveolins (Cavs) are regulators of neuronal and glial survival signaling. Previously we showed that astrocyte and microglial activation is increased in Cav-1 knock-out (KO) mice and that Cav-1 and Cav-3 modulate microglial morphology. We hypothesized that Cavs may regulate cytokine production after TBI. Methods Controlled cortical impact (CCI) model of TBI (3 m/second; 1.0 mm depth; parietal cortex) was performed on wild-type (WT; C57Bl/6), Cav-1 KO, and Cav-3 KO mice. Histology and immunofluorescence microscopy (lesion volume, glia activation), behavioral tests (open field, balance beam, wire grip, T-maze), electrophysiology, electron paramagnetic resonance, membrane fractionation, and multiplex assays were performed. Data were analyzed by unpaired t tests or analysis of variance (ANOVA) with post-hoc Bonferroni’s multiple comparison. Results CCI increased cortical and hippocampal injury and decreased expression of MLR-localized synaptic proteins (24 hours), enhanced NADPH oxidase (Nox) activity (24 hours and 1 week), enhanced polysynaptic responses (1 week), and caused hippocampal-dependent learning deficits (3 months). CCI increased brain lesion volume in both Cav-3 and Cav-1 KO mice after 24 hours (P < 0.0001, n = 4; one-way ANOVA). Multiplex array revealed a significant increase in expression of IL-1β, IL-9, IL-10, KC (keratinocyte chemoattractant), and monocyte chemoattractant protein 1 (MCP-1) in ipsilateral hemisphere and IL-9, IL-10, IL-17, and macrophage inflammatory protein 1 alpha (MIP-1α) in contralateral hemisphere of WT mice after 4 hours. CCI increased IL-2, IL-6, KC and MCP-1 in ipsilateral and IL-6, IL-9, IL-17 and KC in contralateral hemispheres in Cav-1 KO and increased all 10 cytokines/chemokines in both hemispheres except for IL-17 (ipsilateral) and MIP-1α (contralateral) in Cav-3 KO (versus WT CCI). Cav-3 KO CCI showed increased IL-1β, IL-9, KC, MCP-1, MIP-1α, and granulocyte-macrophage colony-stimulating factor in ipsilateral and IL-1β, IL-2, IL-9, IL-10, and IL-17 in contralateral hemispheres (P = 0.0005, n = 6; two-way ANOVA) compared to Cav-1 KO CCI. Conclusion CCI caused astrocyte and microglial activation and hippocampal neuronal injury. Cav-1 and Cav-3 KO exhibited enhanced lesion volume and cytokine/chemokine production after CCI. These findings suggest that Cav isoforms may regulate neuroinflammatory responses and neuroprotection following TBI.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Brian P Head
- Veterans Affairs San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, CA 92161, USA.
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10
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Low-dose endothelial monocyte-activating polypeptide-ii increases permeability of blood-tumor barrier by caveolae-mediated transcellular pathway. J Mol Neurosci 2013; 52:313-22. [PMID: 24526454 DOI: 10.1007/s12031-013-0148-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 10/10/2013] [Indexed: 10/26/2022]
Abstract
Low-dose endothelial monocyte-activating polypeptide-II (EMAP-II) can selectively increase blood-tumor barrier (BTB) permeability via the paracellular pathway. The role of the transcellular pathway in this process is unclear. This study was conducted to evaluate the potential involvement of the transcellular pathway in EMAP-II-induced opening of the BTB and to identify the associated mechanisms. Evans blue extravasation test was used to measure changes in BTB permeability after EMAP-II (80 ng/kg) administration in a rat model of C6 glioma. Changes in the quantity of pinocytotic vesicles in rat brain microvascular endothelial cells (BMECs) were observed using transmission electron microscopy. Reverse transcription-polymerase chain reaction, Western blotting, and immunohistochemistry assays were performed to detect the expression of the caveolar structural proteins, caveolin-1 and caveolin-2, in BMECs. Alterations in the expression of phospho (p)-Src, p-caveolin-1, and p-caveolin-2 and the activity of RhoA also were measured. Effects of tyrosine kinase inhibition on EMAP-II-induced RhoA/Rho kinase activations and tyrosine kinase, RhoA, or Rho kinase inhibition on EMAP-II-induced caveolin-1 and caveolin-2 phosphorylation were determined by inhibition studies. One hour after EMAP-II administration, the quantity of pinocytotic vesicles in BMECs increased markedly, consistent with changes in BTB permeability. The expression levels of caveolin-1, caveolin-2, p-caveolin-1, and p-caveolin-2 in BMECs also were significantly increased at 1 h. The peak expression level of p-Src and the peak activity of RhoA occurred at 0.25 and 0.5 h, respectively. Inhibition of tyrosine kinase significantly diminished the activities of RhoA and Rho kinase induced by EMAP-II. In addition, EMAP-II-induced phosphorylation of caveolin-1 and caveolin-2 was completely blocked by inhibition of tyrosine kinase, RhoA, or Rho kinase. We suggest that low-dose EMAP-II can induce BTB hyperpermeability via the transcellular pathway, which is associated with phosphorylation and upregulation of caveolin-1 and caveolin-2 and involves the tyrosine kinase/RhoA/Rho kinase signaling pathway.
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11
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Niesman IR, Zemke N, Fridolfsson HN, Haushalter KJ, Levy K, Grove A, Schnoor R, Finley JC, Patel PM, Roth DM, Head BP, Patel HH. Caveolin isoform switching as a molecular, structural, and metabolic regulator of microglia. Mol Cell Neurosci 2013; 56:283-97. [PMID: 23851187 DOI: 10.1016/j.mcn.2013.07.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 06/11/2013] [Accepted: 07/02/2013] [Indexed: 11/28/2022] Open
Abstract
Microglia are ramified cells that serve as central nervous system (CNS) guardians, capable of proliferation, migration, and generation of inflammatory cytokines. In non-pathological states, these cells exhibit ramified morphology with processes intermingling with neurons and astrocytes. Under pathological conditions, they acquire a rounded amoeboid morphology and proliferative and migratory capabilities. Such morphological changes require cytoskeleton rearrangements. The molecular control points for polymerization states of microtubules and actin are still under investigation. Caveolins (Cavs), membrane/lipid raft proteins, are expressed in inflammatory cells, yet the role of caveolin isoforms in microglia physiology is debatable. We propose that caveolins provide a necessary control point in the regulation of cytoskeletal dynamics, and thus investigated a role for caveolins in microglia biology. We detected mRNA and protein for both Cav-1 and Cav-3. Cav-1 protein was significantly less and localized to plasmalemma (PM) and cytoplasmic vesicles (CVs) in the microglial inactive state, while the active (amoeboid-shaped) microglia exhibited increased Cav-1 expression. In contrast, Cav-3 was highly expressed in the inactive state and localized with cellular processes and perinuclear regions and was detected in active amoeboid microglia. Pharmacological manipulation of the cytoskeleton in the active or non-active state altered caveolin expression. Additionally, increased Cav-1 expression also increased mitochondrial respiration, suggesting possible regulatory roles in cell metabolism necessary to facilitate the morphological changes. The present findings strongly suggest that regulation of microglial morphology and activity are in part due to caveolin isoforms, providing promising novel therapeutic targets in CNS injury or disease.
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Affiliation(s)
- Ingrid R Niesman
- Department of Anesthesiology, University of California, San Diego, La Jolla, CA 92093, USA.
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Xie H, Wang J, Dhaunchak AS, Shang J, Kou L, Guo M, Wu Y, Gu Q, Colman D, Wu X, Jiang Y. Functional studies of MLC1 mutations in Chinese patients with megalencephalic leukoencephalopathy with subcortical cysts. PLoS One 2012; 7:e33087. [PMID: 22416245 PMCID: PMC3293920 DOI: 10.1371/journal.pone.0033087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Accepted: 02/07/2012] [Indexed: 01/06/2023] Open
Abstract
Megalencephalic leukoencephalopathy with subcortical cysts (MLC, MIM# 604004) is an autosomal recessive inherited disease mostly resulting from MLC1 mutations. In this study, we finished the functional analysis of MLC1 mutations identified recently in Chinese patients, including five newly described missense mutations (R22Q, A32V, G73E, A275T, Y278H), one known nonsense mutation (Y198X), and two known missense mutations (S69L, T118M). We found MLC1wt was localized to the cell periphery, whereas mutant R22Q, A32V, G73E, S69L and T118M were trapped in the lumen of endoplasmic reticulum (ER) when we transfected the wild-type and mutant MLC1 in U373MG cells. Compared to wild type, the mutant G73E, T118M, Y198X and A275T transcript decreased and all mutants except R22Q had lower protein expression in transfected U373MG cells. Therefore, we propose that all these eight MLC1 mutations had functional effect either on their protein/mRNA expression, or on their intracellular protein localization, or both.
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Affiliation(s)
- Han Xie
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
| | - Jingmin Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
| | | | - Jing Shang
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
- Shanxi Medical University, Taiyuan, Shanxi, People's Republic of China
| | - Liping Kou
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
- Shanxi Medical University, Taiyuan, Shanxi, People's Republic of China
| | - Mangmang Guo
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
| | - Ye Wu
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
| | - Qiang Gu
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
| | - David Colman
- Montreal Neurological Institute, Montreal, Quebec, Canada
| | - Xiru Wu
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
- * E-mail: (XW); (YJ)
| | - Yuwu Jiang
- Department of Pediatrics, Peking University First Hospital, Beijing, People's Republic of China
- * E-mail: (XW); (YJ)
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Salgado IK, Serrano M, García JO, Martínez NA, Maldonado HM, Báez-Pagán CA, Lasalde-Dominicci JA, Silva WI. SorLA in glia: shared subcellular distribution patterns with caveolin-1. Cell Mol Neurobiol 2011; 32:409-21. [PMID: 22127416 DOI: 10.1007/s10571-011-9771-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 11/08/2011] [Indexed: 01/25/2023]
Abstract
SorLA is an established sorting and trafficking protein in neurons with demonstrated relevance to Alzheimer's disease (AD). It shares these roles with the caveolins, markers of membrane rafts microdomains. To further our knowledge on sorLA's expression and traffic, we studied sorLA expression in various cultured glia and its relation to caveolin-1 (cav-1), a caveolar microdomain marker. RT-PCR and immunoblots demonstrated sorLA expression in rat C6 glioma, primary cultures of rat astrocytes (PCRA), and human astrocytoma 1321N1 cells. PCRA were determined to express the highest levels of sorLA's message. Induction of differentiation of C6 cells into an astrocyte-like phenotype led to a significant decrease in sorLA's mRNA and protein expression. A set of complementary experimental approaches establish that sorLA and cav-1 directly or indirectly interact in glia: (1) co-fractionation in light-density membrane raft fractions of rat C6 glioma, PCRA, and human 1321N1 astrocytoma cells; (2) a subcellular co-localization distribution pattern in vesicular perinuclear compartments seen via confocal imaging in C6 and PCRA; (3) additional confocal analysis in C6 cells suggesting that the perinuclear compartments correspond to their co-localization in early endosomes and the trans-Golgi; and; (4) co-immunoprecipitation data strongly supporting their direct or indirect physical interaction. These findings further establish that sorLA is expressed in glia and that it shares its subcellular distribution pattern with cav-1. A direct or indirect cav-1/sorLA interaction could modify the trafficking and sorting functions of sorLA in glia and its proposed neuroprotective role in AD.
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Affiliation(s)
- Iris K Salgado
- Department of Physiology, UPR-School of Medicine, University of Puerto Rico, San Juan, PR 00936-5067, USA
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Vascular endothelial growth factor increases permeability of the blood-tumor barrier via caveolae-mediated transcellular pathway. J Mol Neurosci 2010; 44:122-9. [PMID: 21193965 DOI: 10.1007/s12031-010-9487-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Accepted: 12/16/2010] [Indexed: 10/18/2022]
Abstract
The first goal of this study was to determine the effect of vascular endothelial growth factor (VEGF) on permeability of the blood-tumor barrier (BTB). The second goal was to determine possible cellular mechanisms by which VEGF increases permeability of the BTB. In the rat C6 glioma model, the permeability of the BTB was significantly increased after VEGF injection at dose of 0.05 ng/g and reached its peak at 45 min. Meanwhile, we observed that the density of pinocytotic vesicles of brain microvascular endothelial cells (BMECs) in the BTB increased dramatically by transmission electron microscopy. The immunohistochemistry and western blot analysis revealed that the expression level of caveolae structure proteins caveolin-1 and caveolin-2 in BMECs was increased after VEGF injection, peaked at 45 min, and then decreased to the untreated level. The time peak of expression level of caveolin-1 and caveolin-2 was identical with the peak time of permeability of the BTB and the density of pinocytotic vesicles. All of these results strongly indicated that VEGF increased permeability of the BTB caused by enhancement of the density of pinocytotic vesicles, and the molecular mechanism might be associated with upregulated expression of caveolin-1 and caveolin-2.
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MLC1 trafficking and membrane expression in astrocytes: Role of caveolin-1 and phosphorylation. Neurobiol Dis 2010; 37:581-95. [DOI: 10.1016/j.nbd.2009.11.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 10/23/2009] [Accepted: 11/12/2009] [Indexed: 12/19/2022] Open
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McGuire JF, Rouen S, Siegfreid E, Wright DE, Dobrowsky RT. Caveolin-1 and altered neuregulin signaling contribute to the pathophysiological progression of diabetic peripheral neuropathy. Diabetes 2009; 58:2677-86. [PMID: 19675140 PMCID: PMC2768162 DOI: 10.2337/db09-0594] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE Evaluate if Erb B2 activation and the loss of caveolin-1 (Cav1) contribute to the pathophysiological progression of diabetic peripheral neuropathy (DPN). RESEARCH DESIGN AND METHODS Cav1 knockout and wild-type C57BL/6 mice were rendered diabetic with streptozotocin, and changes in motor nerve conduction velocity (MNCV), mechanical and thermal hypoalgesia, Erb B2 phosphorylation (pErb B2), and epidermal nerve fiber density were assessed. The contribution of Erb B2 to DPN was assessed using the Erb B2 inhibitors PKI 166 and erlotinib and a conditional bitransgenic mouse that expressed a constitutively active form of Erb B2 in myelinated Schwann cells (SCs). RESULTS Diabetic mice exhibited decreased MNCV and mechanical and thermal sensitivity, but the extent of these deficits was more severe in diabetic Cav1 knockout mice. Diabetes increased pErb B2 levels in both genotypes, but the absence of Cav1 correlated with a greater increase in pErb B2. Erb B2 activation contributed to the mechanical hypoalgesia and MNCV deficits in both diabetic genotypes because treatment with erlotinib or PKI 166 improved these indexes of DPN. Similarly, induction of a constitutively active Erb B2 in myelinated SCs was sufficient to decrease MNCV and induce a mechanical hypoalgesia in the absence of diabetes. CONCLUSIONS Increased Erb B2 activity contributes to specific indexes of DPN, and Cav1 may be an endogenous regulator of Erb B2 signaling. Altered Erb B2 signaling is a novel mechanism that contributes to SC dysfunction in diabetes, and inhibiting Erb B2 may ameliorate deficits of tactile sensitivity in DPN.
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Affiliation(s)
- James F. McGuire
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, Kansas
| | - Shefali Rouen
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, Kansas
| | - Eric Siegfreid
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, Kansas
| | - Douglas E. Wright
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, Kansas
| | - Rick T. Dobrowsky
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, Kansas
- Corresponding author: Rick T. Dobrowsky,
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Caveolin 1 Expression Independently Predicts Shorter Survival in Oligodendrogliomas. J Neuropathol Exp Neurol 2009; 68:425-31. [DOI: 10.1097/nen.0b013e31819ed0b7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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