1
|
Barrios-González DA, Philibert-Rosas S, Martínez-Juárez IE, Sotelo-Díaz F, Rivas-Alonso V, Sotelo J, Sebastián-Díaz MA. Frequency and Focus of in Vitro Studies of Microglia-Expressed Cytokines in Response to Viral Infection: A Systematic Review. Cell Mol Neurobiol 2024; 44:21. [PMID: 38349562 PMCID: PMC10864563 DOI: 10.1007/s10571-024-01454-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 01/12/2024] [Indexed: 02/15/2024]
Abstract
It is well known that as part of their response to infectious agents such as viruses, microglia transition from a quiescent state to an activated state that includes proinflammatory and anti-inflammatory phases; this behavior has been described through in vitro studies. However, recent in vivo studies on the function of microglia have questioned the two-phase paradigm; therefore, a change in the frequency of in vitro studies is expected. A systematic review was carried out to identify the microglial cytokine profile against viral infection that has been further evaluated through in vitro studies (pro-inflammatory or anti-inflammatory), along with analysis of its publication frequency over the years. For this review, 531 articles published in the English language were collected from PubMed, Web of Science, EBSCO and ResearchGate. Only 27 papers met the inclusion criteria for this systematic review. In total, 19 cytokines were evaluated in these studies, most of which are proinflammatory; the most common are IL-6, followed by TNF-α and IL-1β. It should be pointed out that half of the studies were published between 2015 and 2022 (raw data available in https://github.com/dadriba05/SystematicReview.git ). In this review, we identified that evaluation of pro-inflammatory cytokines released by microglia against viral infections has been performed more frequently than that of anti-inflammatory cytokines; additionally, a higher frequency of evaluation of the response of microglia cells to viral infection through in vitro studies from 2015 and beyond was noted.
Collapse
Affiliation(s)
| | | | | | - Fernando Sotelo-Díaz
- Epilepsy Clinic. National Institute of Neurology and Neurosurgery, Mexico City, Mexico
| | - Verónica Rivas-Alonso
- Multiple Sclerosis Clinic, National Institute of Neurology and Neurosurgery, Mexico City, Mexico
| | - Julio Sotelo
- Department of Neuroimmunology, National Institute of Neurology and Neurosurgery, Mexico City, Mexico
| | - Mario A Sebastián-Díaz
- Nephrology Department, South Central High Specialty Hospital PEMEX, Anillo Periférico 4019 Fuentes del Pedregal, Tlalpan, 1440, Mexico City, Mexico.
| |
Collapse
|
2
|
Fan A, Oladiran O, Shi XQ, Zhang J. High-salt diet decreases mechanical thresholds in mice that is mediated by a CCR2-dependent mechanism. J Neuroinflammation 2020; 17:179. [PMID: 32517772 PMCID: PMC7282096 DOI: 10.1186/s12974-020-01858-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 05/27/2020] [Indexed: 02/07/2023] Open
Abstract
Background Though it is well-known that a high-salt diet (HSD) is associated with many chronic diseases, the effects of long-term high-salt intake on physiological functions and homeostasis remain elusive. In this study, we investigated whether and how an HSD affects mouse nociceptive thresholds, and myeloid cell trafficking and activation. Methods Healthy C57BL/6 male and female mice were fed an HSD (containing 4% NaCl in chow and 1% NaCl in water) from the time of weaning for 3 to 4 months. Circulating monocytes, nerve macrophages, spinal microglia, and associated inflammatory responses were scrutinized using flow cytometry, immunohistochemistry, and quantitative real-time polymerase chain reaction (qPCR) approaches. Mouse pain sensitivity to mechanical stimuli was monitored with von Frey tests along the experimental duration. Results Mice on an HSD have reduced mechanical thresholds. They feel more pain than those on a normal diet (ND), e.g., regular laboratory chow (0.3% NaCl in chow). An HSD induced not only a remarkable expansion of circulating monocytes, CCR2+Ly6Chi inflammatory monocytes in particular, but also an accumulation of CD11b+F4/80+ macrophages in the peripheral nerves and an activation of Iba-1+ spinal microglia. Replacing an HSD with a ND was unable to reverse the HSD-induced mechanical hypersensitivity or rescue the altered immune responses. However, treating HSD-fed mice with a chemokine receptor CCR2 antagonist effectively normalized the pain thresholds and immune cell profile in the periphery and spinal cord. An HSD failed to alter pain thresholds and myeloid cell activation in CCR2-deficient mice. Spinal microglial activation is required for HSD-induced mechanical hypersensitivity in male, but not in female mice. Conclusion Overall, this study provides evidence that an HSD has a long-term impact on physiological function. CCR2-mediated cellular response, including myeloid cell trafficking and associated inflammation, plays pivotal roles in salt-dietary modulation of pain sensitivity.
Collapse
Affiliation(s)
- Anni Fan
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Avenue, Montreal, QC, H3A 0G1, Canada
| | - Oladayo Oladiran
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Avenue, Montreal, QC, H3A 0G1, Canada
| | - Xiang Qun Shi
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Avenue, Montreal, QC, H3A 0G1, Canada
| | - Ji Zhang
- The Alan Edwards Centre for Research on Pain, McGill University, 740, Dr. Penfield Avenue, Montreal, QC, H3A 0G1, Canada. .,Department of Microbiology and Immunology, Faculty of Medicine, McGill University, Montreal, Canada. .,Department of Neurology and Neurosurgery, Faculty of Medicine, McGill University, Montreal, Canada. .,Faculty of Dentistry, McGill University, Montreal, Canada.
| |
Collapse
|
3
|
Immune cell regulation of glia during CNS injury and disease. Nat Rev Neurosci 2020; 21:139-152. [DOI: 10.1038/s41583-020-0263-9] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/06/2020] [Indexed: 12/13/2022]
|
4
|
Delery EC, MacLean AG. Culture Model for Non-human Primate Choroid Plexus. Front Cell Neurosci 2019; 13:396. [PMID: 31555096 PMCID: PMC6724611 DOI: 10.3389/fncel.2019.00396] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/15/2019] [Indexed: 11/13/2022] Open
Abstract
While there are murine and rat choroid plexus epithelial cell cultures, a translationally relevant model for choroid plexus activation and function is still lacking. The rhesus macaque is the gold standard for modeling viral infection and activation of CNS, including HIV-associated neurocognitive disorders. We have developed a rhesus macaque choroid plexus epithelial cell culture model which we believe to be suitable for studies of inflammation associated with viral infection of the CNS. Epithelial morphology and function were assessed using vimentin, phalloidin, the tight junction protein zonula-occludens-1 (ZO-1), and focal adhesion kinase (FAK). Choroid plexus epithelial cell type was confirmed using immunofluorescence with two proteins highly expressed in the choroid plexus: transthyretin and α-klotho. Finally, barrier properties of the model were monitored using pro- and anti-inflammatory mediators (TNF-α, the TLR2 agonist PamCys3K, and dexamethasone). When pro-inflammatory TNF-α was added to the xCelligence wells, there was a decrease in barrier function, which decreased in a step-wise fashion with each additional administration. This barrier function was repaired upon addition of the steroid dexamethasone. The TLR2 agonist PAM3CysK increased barrier functions in TNF-α treated wells. We have presented a model of the blood-CSF barrier that will allow study into pro- and anti-inflammatory conditions in the brain, while simultaneously measuring real time changes to epithelial cells.
Collapse
Affiliation(s)
- Elizabeth C Delery
- Division of Comparative Pathology, Tulane National Primate Research Center, Covington, LA, United States.,Tulane Program in Biomedical Sciences, New Orleans, LA, United States.,Department of Microbiology and Immunology, Tulane Medical School, New Orleans, LA, United States
| | - Andrew G MacLean
- Division of Comparative Pathology, Tulane National Primate Research Center, Covington, LA, United States.,Tulane Program in Biomedical Sciences, New Orleans, LA, United States.,Department of Microbiology and Immunology, Tulane Medical School, New Orleans, LA, United States.,Tulane Brain Institute, New Orleans, LA, United States.,Tulane Center for Aging, New Orleans, LA, United States
| |
Collapse
|
5
|
Delery E, Bohannon DG, Irons DL, Allers C, Sugimoto C, Cai Y, Merino KM, Amedee AM, Veazey RS, MacLean A, Kuroda MJ, Kim WK. Lack of susceptibility in neonatally infected rhesus macaques to simian immunodeficiency virus-induced encephalitis. J Neurovirol 2019; 25:578-588. [PMID: 31119711 PMCID: PMC6751025 DOI: 10.1007/s13365-019-00755-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 02/15/2019] [Accepted: 04/23/2019] [Indexed: 12/18/2022]
Abstract
Despite combination antiretroviral therapies making HIV a chronic rather than terminal condition for many people, the prevalence of HIV-associated neurocognitive disorders (HAND) is increasing. This is especially problematic for children living with HIV. Children diagnosed HAND rarely display the hallmark pathology of HIV encephalitis in adults, namely infected macrophages and multinucleated giant cells in the brain. This finding has also been documented in rhesus macaques infected perinatally with simian immunodeficiency virus (SIV). However, the extent and mechanisms of lack of susceptibility to encephalitis in perinatally HIV-infected children remain unclear. In the current study, we compared brains of macaques infected with pathogenic strains of SIV at different ages to determine neuropathology, correlates of neuroinflammation, and potential underlying mechanisms. Encephalitis was not found in the macaques infected within 24 h of birth despite similar high plasma viral load and high monocyte turnover. Macaques developed encephalitis only when they were infected after 4 months of age. Lower numbers of CCR5-positive cells in the brain, combined with a less leaky blood-brain barrier, may be responsible for the decreased virus infection in the brain and consequently the absence of encephalitis in newborn macaques infected with SIV.
Collapse
MESH Headings
- Age Factors
- Animals
- Animals, Newborn
- Blood-Brain Barrier/immunology
- Blood-Brain Barrier/pathology
- Blood-Brain Barrier/virology
- Brain Stem/immunology
- Brain Stem/pathology
- Brain Stem/virology
- Capillary Permeability/immunology
- Disease Resistance
- Encephalitis, Viral/genetics
- Encephalitis, Viral/immunology
- Encephalitis, Viral/pathology
- Encephalitis, Viral/virology
- Frontal Lobe/immunology
- Frontal Lobe/pathology
- Frontal Lobe/virology
- Gene Expression
- Macaca mulatta/virology
- Macrophages/immunology
- Macrophages/pathology
- Macrophages/virology
- Monocytes/immunology
- Monocytes/pathology
- Monocytes/virology
- RNA, Viral/genetics
- RNA, Viral/metabolism
- Receptors, CCR5/genetics
- Receptors, CCR5/immunology
- Receptors, Virus/genetics
- Receptors, Virus/immunology
- Simian Acquired Immunodeficiency Syndrome/genetics
- Simian Acquired Immunodeficiency Syndrome/immunology
- Simian Acquired Immunodeficiency Syndrome/pathology
- Simian Acquired Immunodeficiency Syndrome/virology
- Simian Immunodeficiency Virus/pathogenicity
- Simian Immunodeficiency Virus/physiology
- Viral Load
Collapse
Affiliation(s)
- Elizabeth Delery
- Tulane National Primate Research Center, Covington, LA, USA
- Department of Microbiology & Immunology, Tulane Medical School, New Orleans, LA, USA
| | - Diana G Bohannon
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, USA
| | - Derek L Irons
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, USA
| | | | - Chie Sugimoto
- Tulane National Primate Research Center, Covington, LA, USA
- Dokkyo Medical University, Tochigi, Japan
| | - Yanhui Cai
- Tulane National Primate Research Center, Covington, LA, USA
- The Wistar Institute, Philadelphia, PA, USA
| | | | - Angela M Amedee
- Louisiana State University School of Medicine, New Orleans, LA, USA
| | | | - Andrew MacLean
- Tulane National Primate Research Center, Covington, LA, USA
- Department of Microbiology & Immunology, Tulane Medical School, New Orleans, LA, USA
- Tulane Brain Institute, New Orleans, LA, USA
- Tulane Center for Aging, New Orleans, LA, USA
| | - Marcelo J Kuroda
- Tulane National Primate Research Center, Covington, LA, USA
- University of California Davis, Davis, CA, USA
| | - Woong-Ki Kim
- Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, USA.
| |
Collapse
|
6
|
Prophylactic Repetitive Treatment with the Herbal Medicine Kei-kyoh-zoh-soh-oh-shin-bu-toh Attenuates Oxaliplatin-Induced Mechanical Allodynia by Decreasing Spinal Astrocytes. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:4029694. [PMID: 31118957 PMCID: PMC6500670 DOI: 10.1155/2019/4029694] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 03/24/2019] [Accepted: 04/09/2019] [Indexed: 01/27/2023]
Abstract
Chemotherapeutic drugs typically induce peripheral neuropathy, which is a major dose-limiting side effect of these drugs and is difficult to manage. In this study, we examined whether the traditional herbal formulation Kei-kyoh-zoh-soh-oh-shin-bu-toh (KSOT) could relieve the mechanical allodynia induced by chemotherapeutic drugs (oxaliplatin, paclitaxel, vincristine, and bortezomib) in mice. A single intraperitoneal injection of oxaliplatin, paclitaxel, vincristine, and bortezomib was used to induce mechanical allodynia, which peaked on days 10, 14, 14, and 12 after the injection, respectively. A single oral administration of KSOT did not inhibit mechanical allodynia after any of the treatments. However, prophylactic repetitive oral administrations of KSOT inhibited the exacerbation of mechanical allodynia induced by oxaliplatin but were not effective for allodynia induced by the other drugs. A single intraperitoneal injection of oxaliplatin did not alter the mRNA expression of the NMDA receptor NR2B in the spinal cord and that of neuregulin-1 in the sciatic nerve. In addition, the number of microglia in spinal dorsal horn did not increase in oxaliplatin-treated mice. However, the number of reactivated astrocytes in the spinal dorsal horn increased, which could be inhibited by repetitive administration of KSOT. These results suggest that prophylactic repetitive treatment of KSOT attenuates oxaliplatin-induced mechanical allodynia by decreasing the number of spinal astrocytes.
Collapse
|
7
|
Abstract
Viral infection in the brain can be acute or chronic, with the responses often producing foci of increasingly cytotoxic inflammation. This can lead to effects beyond the central nervous system (CNS). To stimulate discussion, this commentary addresses four questions: What drives the development of human immunodeficiency virus (HIV)-associated neurocognitive disorders, does the phenotype of macrophages in the CNS spur development of HIV encephalitis (HIVE), does continual activation of astrocytes drive the development of HIV-associated neurocognitive disorders/subclinical disease, and neuroinflammation: friend or foe? A unifying theory that connects each question is the issue of continued activation of glial cells, even in the apparent absence of simian immunodeficiency virus/HIV in the CNS. As the CNS innate immune system is distinct from the rest of the body, it is likely there could be a number of activation profiles not observed elsewhere.
Collapse
Affiliation(s)
- Elizabeth C. Delery
- Tulane National Primate Research Center, Covington, Louisiana
- Tulane Program in Biomedical Sciences, Tulane Medical School, New Orleans, Louisiana
- Department of Microbiology and Immunology, Tulane Medical School, New Orleans, Louisiana
| | - Andrew G. MacLean
- Tulane National Primate Research Center, Covington, Louisiana
- Tulane Program in Biomedical Sciences, Tulane Medical School, New Orleans, Louisiana
- Department of Microbiology and Immunology, Tulane Medical School, New Orleans, Louisiana
- Tulane Brain Institute, Tulane University, New Orleans, Louisiana
- Center for Aging, School of Medicine, Tulane University, New Orleans, Louisiana
| |
Collapse
|
8
|
Attenuated SIV causes persisting neuroinflammation in the absence of a chronic viral load and neurotoxic antiretroviral therapy. AIDS 2016; 30:2439-2448. [PMID: 27258396 PMCID: PMC5051525 DOI: 10.1097/qad.0000000000001178] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Using simian models, where SIV chronic viral loads are naturally controlled in the absence of potentially neurotoxic therapies, we investigated the neuropathological events occurring during times of suppressed viraemia and when these events were initiated.
Collapse
|
9
|
Robillard KN, Lee KM, Chiu KB, MacLean AG. Glial cell morphological and density changes through the lifespan of rhesus macaques. Brain Behav Immun 2016; 55:60-69. [PMID: 26851132 PMCID: PMC4899176 DOI: 10.1016/j.bbi.2016.01.006] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 01/04/2016] [Accepted: 01/12/2016] [Indexed: 11/18/2022] Open
Abstract
How aging impacts the central nervous system (CNS) is an area of intense interest. Glial morphology is known to affect neuronal and immune function as well as metabolic and homeostatic balance. Activation of glia, both astrocytes and microglia, occurs at several stages during development and aging. The present study analyzed changes in glial morphology and density through the entire lifespan of rhesus macaques, which are physiologically and anatomically similar to humans. We observed apparent increases in gray matter astrocytic process length and process complexity as rhesus macaques matured from juveniles through adulthood. These changes were not attributed to cell enlargement because they were not accompanied by proportional changes in soma or process volume. There was a decrease in white matter microglial process length as rhesus macaques aged. Aging was shown to have a significant effect on gray matter microglial density, with a significant increase in aged macaques compared with adults. Overall, we observed significant changes in glial morphology as macaques age indicative of astrocytic activation with subsequent increase in microglial density in aged macaques.
Collapse
Affiliation(s)
- Katelyn N Robillard
- Tulane National Primate Research Center, Covington, LA, United States; Southeastern Louisiana University, Hammond, LA, United States
| | - Kim M Lee
- Tulane National Primate Research Center, Covington, LA, United States; Tulane Program in Biomedical Sciences, Tulane University School of Medicine, New Orleans, LA, United States
| | - Kevin B Chiu
- Tulane National Primate Research Center, Covington, LA, United States
| | - Andrew G MacLean
- Tulane National Primate Research Center, Covington, LA, United States; Tulane Program in Biomedical Sciences, Tulane University School of Medicine, New Orleans, LA, United States; Tulane Program in Neuroscience, Tulane University, New Orleans, LA, United States; Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, LA, United States.
| |
Collapse
|
10
|
Lee DE, Yue X, Ibrahim WG, Lentz MR, Peterson KL, Jagoda EM, Kassiou M, Maric D, Reid WC, Hammoud DA. Lack of neuroinflammation in the HIV-1 transgenic rat: an [(18)F]-DPA714 PET imaging study. J Neuroinflammation 2015; 12:171. [PMID: 26377670 PMCID: PMC4574011 DOI: 10.1186/s12974-015-0390-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Accepted: 09/02/2015] [Indexed: 11/29/2022] Open
Abstract
Background HIV-associated neuroinflammation is believed to be a major contributing factor in the development of HIV-associated neurocognitive disorders (HAND). In this study, we used micropositron emission tomography (PET) imaging to quantify neuroinflammation in HIV-1 transgenic rat (Tg), a small animal model of HIV, known to develop neurological and behavioral problems. Methods Dynamic [18F]DPA-714 PET imaging was performed in Tg and age-matched wild-type (WT) rats in three age groups: 3-, 9-, and 16-month-old animals. As a positive control for neuroinflammation, we performed unilateral intrastriatal injection of quinolinic acid (QA) in a separate group of WT rats. To confirm our findings, we performed multiplex immunofluorescent staining for Iba1 and we measured cytokine/chemokine levels in brain lysates of Tg and WT rats at different ages. Results [18F]DPA-714 uptake in HIV-1 Tg rat brains was generally higher than in age-matched WT rats but this was not statistically significant in any age group. [18F]DPA-714 uptake in the QA-lesioned rats was significantly higher ipsilateral to the lesion compared to contralateral side indicating neuroinflammatory changes. Iba1 immunofluorescence showed no significant differences in microglial activation between the Tg and WT rats, while the QA-lesioned rats showed significant activation. Finally, cytokine/chemokine levels in brain lysates of the Tg rats and WT rats were not significantly different. Conclusion Microglial activation might not be the primary mechanism for neuropathology in the HIV-1 Tg rats. Although [18F]DPA-714 is a good biomarker of neuroinflammation, it cannot be reliably used as an in vivo biomarker of neurodegeneration in the HIV-1 Tg rat. Electronic supplementary material The online version of this article (doi:10.1186/s12974-015-0390-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Dianne E Lee
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA
| | - Xuyi Yue
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | - Wael G Ibrahim
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA
| | - Margaret R Lentz
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA
| | - Kristin L Peterson
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA
| | - Elaine M Jagoda
- Molecular Imaging Program (MIP), National Cancer Institute (NCI), Bethesda, MD, USA
| | - Michael Kassiou
- Chemistry Department, The University of Sydney, Sydney, Australia
| | - Dragan Maric
- Division of Intermural Research (DIR), National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health, Bethesda, MD, USA
| | - William C Reid
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA
| | - Dima A Hammoud
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, National Institutes of Health/Clinical Center, 10 Center Drive, Room 1C368, Bethesda, MD, 20814-9692, USA.
| |
Collapse
|
11
|
Immunopathogenesis of simian immunodeficiency virus infection in nonhuman primates. Curr Opin HIV AIDS 2013; 8:273-9. [PMID: 23615117 DOI: 10.1097/coh.0b013e328361cf5b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE OF REVIEW Soon after the discovery of HIV-infected humans, rhesus macaques in a colony at the New England Primate Research Center showed similar signs of a progressive immune suppression. The discovery of the simian immunodeficiency virus (SIV)-associated disease opened the door to study an AIDS-like illness in nonhuman primates (NHP). Even after 3 decades, this animal model remains an invaluable tool to provide a greater insight into HIV immunopathogenesis. In this review, recent progress in deciphering pathways of immunopathogenesis in SIV-infected NHP is discussed. RECENT FINDINGS The immense diversity of mutations in SIV stocks prepared at different laboratories has recently been realized. The massive expansion of the enteric virome is a key finding in SIV-induced immunopathogenesis. Defining the function of host restriction factors, like the recently discovered SAMHD1, helps to evaluate the impact of the innate immune responses on virus replication. Utilization of pyrosequencing and defining molecular mechanisms of major histocompatibility complex (MHC) class I restriction helps to understand how the virus evades CD8 T-cell responses. The definition of MHC class I molecules in different NHP species provides new animal models to study SIV immunopathogenesis. T follicular helper cells have gained major interest in characterizing humoral immune responses in SIV infection and AIDS vaccine strategies. The ability of natural hosts to remain disease-free despite ongoing replication of SIV is continuing to puzzle the field. SUMMARY The HIV research field continues to realize the immense complexity of the host virus interaction. NHP present an invaluable tool to make progress towards an effective AIDS vaccine.
Collapse
|
12
|
Ramesh G, MacLean AG, Philipp MT. Cytokines and chemokines at the crossroads of neuroinflammation, neurodegeneration, and neuropathic pain. Mediators Inflamm 2013; 2013:480739. [PMID: 23997430 PMCID: PMC3753746 DOI: 10.1155/2013/480739] [Citation(s) in RCA: 388] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/11/2013] [Accepted: 07/12/2013] [Indexed: 01/18/2023] Open
Abstract
Cytokines and chemokines are proteins that coordinate the immune response throughout the body. The dysregulation of cytokines and chemokines is a central feature in the development of neuroinflammation, neurodegeneration, and demyelination both in the central and peripheral nervous systems and in conditions of neuropathic pain. Pathological states within the nervous system can lead to activation of microglia. The latter may mediate neuronal and glial cell injury and death through production of proinflammatory factors such as cytokines and chemokines. These then help to mobilize the adaptive immune response. Although inflammation may induce beneficial effects such as pathogen clearance and phagocytosis of apoptotic cells, uncontrolled inflammation can result in detrimental outcomes via the production of neurotoxic factors that exacerbate neurodegenerative pathology. In states of prolonged inflammation, continual activation and recruitment of effector cells can establish a feedback loop that perpetuates inflammation and ultimately results in neuronal injury. A critical balance between repair and proinflammatory factors determines the outcome of a neurodegenerative process. This review will focus on how cytokines and chemokines affect neuroinflammation and disease pathogenesis in bacterial meningitis and brain abscesses, Lyme neuroborreliosis, human immunodeficiency virus encephalitis, and neuropathic pain.
Collapse
Affiliation(s)
- Geeta Ramesh
- Division of Bacteriology and Parasitology, Tulane National Primate Research Center, Tulane University, 18703 Three Rivers Road, Covington, LA 70433, USA.
| | | | | |
Collapse
|
13
|
Renner NA, Sansing HA, Inglis FM, Mehra S, Kaushal D, Lackner AA, Maclean AG. Transient acidification and subsequent proinflammatory cytokine stimulation of astrocytes induce distinct activation phenotypes. J Cell Physiol 2013; 228:1284-94. [PMID: 23154943 DOI: 10.1002/jcp.24283] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2012] [Accepted: 11/02/2012] [Indexed: 01/18/2023]
Abstract
The foot processes of astrocytes cover over 60% of the surface of brain microvascular endothelial cells, regulating tight junction integrity. Retraction of astrocyte foot processes has been postulated to be a key mechanism in pathology. Therefore, movement of an astrocyte in response to a proinflammatory cytokine or even limited retraction of processes would result in leaky junctions between endothelial cells. Astrocytes lie at the gateway to the CNS and are instrumental in controlling leukocyte entry. Cultured astrocytes typically have a polygonal morphology until stimulated. We hypothesized that cultured astrocytes which were induced to stellate would have an activated phenotype compared with polygonal cells. We investigated the activation of astrocytes derived from adult macaques to the cytokine TNF-α under resting and stellated conditions by four parameters: morphology, intermediate filament expression, adhesion, and cytokine secretion. Astrocytes were stellated following transient acidification; resulting in increased expression of GFAP and vimentin. Stellation was accompanied by decreased adhesion that could be recovered with proinflammatory cytokine treatment. Surprisingly, there was decreased secretion of proinflammatory cytokines by stellated astrocytes compared with polygonal cells. These results suggest that astrocytes are capable of multiple phenotypes depending on the stimulus and the order stimuli are applied.
Collapse
Affiliation(s)
- Nicole A Renner
- Program in Neuroscience, Tulane University, New Orleans, LA, USA
| | | | | | | | | | | | | |
Collapse
|