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Inflammation: Fundamental Mechanisms

Inflammation: Fundamental Mechanisms

Ley Klaus

(2018)

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Table of Contents

Section Title Page Action Price
Contents v
Chapter 1 TNF Superfamily in Inflammation 1
1. Introduction 1
1.1. Discovery of TNF and lymphotoxin 1
1.2 Description of TNFSF proteins 2
1.2.1. TNFSF ligands 2
1.2.2. TNF receptors superfamily 5
1.2.3. Ligand-receptor binding models 5
1.2.4. The lymphotoxin and tumor necrosis factor network 6
1.3. Signaling pathways 8
1.3.1. The TNF-TNFR pathway 8
1.3.2. LTbR signaling and the alternative NF-kB pathway 10
2. TNFSF and inflammation 11
2.1. Acute inflammation 11
2.2. Chronic inflammation and autoimmunity 15
2.3. TNFSF signatures in human pathologies 18
2.3.1. Rheumatoid arthritis 18
2.3.2. Inflammatory bowel disease 19
2.4. Experimental models and the TNFSF as drug targets 21
3. Targeting TNFSF in the clinic 26
3.1. TNF inhibitors 26
3.2. Other TNFSF targets 29
4. Summary 31
Acknowledgements 32
References 32
Chapter 2 Complement as a Mediator of Inflammation 51
1. Introduction to the complement system 51
1.1. What is complement? 51
1.2. Initiation of complement activation 52
1.3. Amplification in the activation pathways 52
1.4. The amplification loop of the alternative pathway 54
1.5. Amplification at the stage of C5 cleavage 54
1.6. Assembly of the membrane attack complex 55
1.7. Active products of complement activation 55
1.8. Complement regulation 57
1.9. Complement receptors 57
2. Complement roles in health 58
2.1. Protection against infection 58
2.2. Immune complex solubilisation 58
2.3. Priming adaptive immunity 59
2.4. Regulating lipid metabolism 59
3. Complement roles in disease 60
3.1. Complement and autoimmunity 60
3.2. Complement deficiencies 61
3.3. Complement mutations and polymorphisms 63
4. Complement as a driver of inflammation 64
4.1. General principles 64
4.2. Complement anaphylatoxins 65
4.3. Membrane attack complex 68
4.4. Complement and inflammasome activation 70
5. Complement inhibitors as anti-inflammatory drugs 71
5.1. Pathway blockers as anti-inflammatory drugs 71
5.2. Blocking C3a and C5a to inhibit inflammation 72
6. Summary and future prospects 73
References 74
Chapter 3 Lipids and Inflammation 79
1. Introduction 79
2. Lipids and inflammation in obesity 80
3. Circulating plasma lipids and inflammation 82
4. Specific lipid classes in inflammation 84
4.1. Eicosanoids and related lipids 84
4.1.1. COX enzymes, products, and their receptors 84
4.1.2. Inhibition of COXs 87
4.1.3. COX metabolites in inflammation 87
4.1.4. LOX enzymes, products, and their receptors 89
4.1.5. LOX metabolites in inflammation 91
4.1.6. Transcellular generation of eicosanoids 92
4.1.7. Endocannabinoids and inflammation 94
4.1.8. Isoprostanes and inflammation 96
4.2. Phospholipids in inflammation 96
4.2.1. Aminophospholipid translocation in inflammation 97
4.2.2. Oxidized phospholipids in inflammation 97
4.2.3. Lysophospholipids (LP) and phosphatidic acid (PA) 100
4.2.4. Phosphoinositides 101
4.3. Ceramides/sphingolipids 103
5. Lipid receptors in inflammation: PPAR and LXR 105
5.1. Peroxisome proliferator-activated receptors (PPAR) 105
5.2. Liver X receptor (LXR) 107
6. Lipidomics of inflammation: Analysis of bioactive lipids 107
7. Summary 109
References 109
Chapter 4 Reactive Oxygen Species 125
1. Introduction 125
2. Reactive oxygen species 126
2.1. Superoxide 127
2.2. Hydrogen peroxide 128
2.3. Hydroxyl radical 129
2.4. Hypochlorous acid 129
2.5. Oxidative protein modification 130
3. Oxidant–antioxidant balance 131
4. ROS sources 135
4.1. H2O2 as secondary enzymatic product 135
4.2. Prokaryotic H2O2 136
4.3. O2 as secondary enzymatic product — Mitochondrial electron transport chain 137
4.4. O2 and H2O2 as primary enzymatic product — NADPH oxidases 139
4.4.1. NOX/DUOX structural organization 140
4.4.2. NOX2 assembly and activation 143
4.4.3. Regulation of other NOX/DUOX family members 146
4.4.4. ROS deficiency due to NADPH oxidase variants including CGD 147
5. ROS in immunity and inflammation 148
5.1. Mitochondrial ROS in immunity and inflammation 148
5.2. NOX2-derived ROS in immunity and inflammation 150
6. Outlook 152
Acknowledgments 153
Glossary of acronyms and abbreviations 153
References 155
Chapter 5 Leukocyte Adhesion 171
1. Leukocyte adhesion molecules 172
1.1. Integrins 172
1.1.1. Endothelial ligands for integrins 180
1.1.2. ECM ligands for integrins 181
1.2. Selectins 181
1.3. Leukocyte ligands for selectins 182
1.4. Immunoglobulin adhesion molecules 183
2. Biomechanics of leukocytes adhesion under flow 184
3. Adhesion cascade 186
3.1. Deviations from the adhesion cascade 187
4. Leukocyte subsets 188
5. Leukocyte adhesion in lymphatics 190
6. Leukocyte adhesion to thrombi 190
7. Defects in leukocyte adhesion 191
References 192
Chapter 6 Neutrophil Extracellular Traps 205
1. Introduction 205
1.1. Introduction of neutrophils 206
1.2. Discovery of NETs 207
2. Architecture and composition of NETs 208
3. Formation of NETs 211
3.1. Suicidal NETosis 211
3.2. Vital NETosis 216
4. Induction of NETosis 217
5. Regulation of NETosis 219
5.1. Reactive oxygen species 219
5.2. Neutrophil elastase 220
5.3. Peptidylarginine deminase 4 220
6. Clearance of NETs 221
7. General Functions of NETs 222
8. Functions of NETs in disease 223
9. Antimicrobial NETs 224
9.1. Viral infections 228
9.2. Bacterial infections 229
9.3. Fungal infections 234
9.4. Parasitic infections 239
10. Cytotoxic NETs 241
10.1. Cytotoxic activity of NETs 242
10.2. Infection 243
10.3. Sterile inflammation 244
11. Prothrombotic NETs 246
11.1. Endothelium 247
11.2. Platelets 248
11.3. Red blood cells 248
11.4. Coagulation 249
11.5. Thrombolysis 249
11.6. Animal models of thrombosis 250
11.7. Patients with thrombosis 251
12. Immunogenic NETs 251
12.1. NETs in systemic lupus erythematosus and vasculitis 253
12.2. NETs in rheumatoid arthritis 256
12.3. NETs in other autoimmune diseases 256
13. Anti-inflammatory NETs 257
14. Conclusions 258
Acknowledgments 259
References 259
Chapter 7 Sepsis 277
1. Introduction 277
1.1. Epidemiology of sepsis 277
1.2. History of experimental and clinical sepsis studies 278
2. Brief overview of pathophysiology 278
2.1. Hyperinflammation 278
2.2. Immunosuppression 279
2.3. Long-term defects associated with sepsis 280
3. Cellular and molecular consequences of sepsis 280
3.1. Redox imbalance 280
3.2. Defective Ca2+ homeostasis 281
3.3. PARP1, PARP2 activation 281
3.4. Mitochondrial dysfunction 282
3.5. Apoptosis of lymphoid cells and immunosuppression 282
3.6. Extracellular histones 283
4. Role of complement in sepsis 283
4.1. Complement activation in sepsis 283
4.2. Role of C5a and its receptors in experimental sepsis 284
4.3. Role of complement and extracellular histones in sepsis 285
5. Current concepts, problems, and controversies in animal sepsis models 286
5.1. Heterogeneity of animal models of sepsis 287
5.2. Endotoxemia studies 289
5.3. Use of rodents versus larger animals 289
6. Current concepts, problems and controversies in human sepsis studies 290
6.1. Concerns about current clinical classifications of human sepsis 290
6.2. Failure in clinical trials, including recent clinical trials using antagonists of toll-like receptors 290
6.3. Concerns about clinical trial endpoints 292
6.4. The influence of age and co-morbidities\rin human sepsis 292
6.5. Genomic analysis of septic humans 293
6.6. Human sepsis biomarkers 293
7. The current outlook on treatment of sepsis 294
References 295
Chapter 8 Granulomatous Inflammation 303
1. Introduction 303
1.1. Architecture of the granuloma 305
1.2. Basic principles of the granulomatous inflammation 306
2. Granulomatous inflammation of infectious origin 309
2.1. Bacterial triggers 309
2.1.1. Tuberculosis 309
2.1.2. Leprosy 312
2.2. Other bacterial triggers 313
2.3. Fungal triggers 313
2.3.1. Histoplasmosis 313
2.3.2. Other fungal pathogens 314
2.4. Viral triggers 314
2.4.1. Hepatitis viruses 314
2.4.2. Other viruses that can cause granulomatous inflammation 315
2.5. Other infectious triggers 315
2.5.1. Schistosomiasis 315
2.5.2. Leishmaniasis 318
3. Immune-related, idiopathic granulomatous inflammation 319
3.1. Vasculitis 319
3.1.1. Small-vessel vasculitis 319
3.1.2. Large-vessel vasculitis 322
3.1.2.1. Giant cell arteritis 322
3.1.2.2. Takayasu’s arteritis 325
3.2. Sarcoidosis 326
3.3. Crohn’s disease 327
3.4. Primary biliary cirrhosis 329
3.5. Common variable immune deficiency 330
4. Granulomatous inflammation associated with environmental and iatrogenic triggers 331
4.1. Berylliosis 331
4.2. Silicosis 332
4.3. Foreign bodies and topical medication 333
4.4. Other triggers 334
4.4.1. Chronic granulomatous disease 334
4.4.2. Granuloma annulare 335
5. Conclusions 336
References 336
Index 357