chp101 oxidative stress, inflammation, and diabetes complications
TRANSCRIPT
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Chp101Oxidative stress,
inflammation, and diabetes complications
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Free radical
• 유익성 -microorganisms&cancer cell
• 유해성 -damage of cellular structures and enzymes
lipid peroxidation • superoxide anion• hydrogen peroxide• hydroxyl radical
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vascular 에 대한 영향
•Endothelial cell – direct toxic effects
• VSMC – proliferation
• arachiodonic or linoleic acid metabolism free radical & lipid peroxide
• glucose 12-LO & 12-HETE
Lipoxigenase(LO)•15-LO•12-LO • VSMC migrationLO product--- HPETEs PKC, oncogene activation• HTETs VSMC hypertrophy, matrix production MAPKs
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• antioxidant OS & freeradical
V-E V-C Glutathione Cysteine Methionine Ubiquinone Urate Penicillamine V-A
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Nitric oxide(NO)
L-arginine NO
NOS---
NO synthases (NOS)
Endothelium & other
• inducible NOS(iNOS or typeII)• neuronal NOS(ncNOS or typeI)• endothelial NOS(eNOS or typeIII)
low-oxidized LDL phy-insulin eNOS sex hormones proinflammatory cytokines eNOS (TNF-a)
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그림 101.2
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Oxidative state affect NO function
Superoxide anion + No peroxinitride
• hydroxyl radical
• lipoprotein oxidation
• apoptosis
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Mechanisms by which elevated glucose could lead to increased
And diabetic complications
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• glucose autoxidation itselffree radical &NADPH/NAD+ HG&TNF-a have aditive effect on superoxide prooduction
• glucose free radical NADPH/NAD+
※ NADPH/NAD+ change in vascular permeability&flow • high glucose(HG) LO(expression&activity) endothelial cell 15-HETE HG VSMC growth HG 12-LO • signal transduction HG PKC • • MAPK, ERK1/2, C-jun amino-terminal kinase, p38 MAPK, AP-1, NF-kB
Sorbitol pathway
LO inhibitor
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• NF-kB regulates transcrition • vascular endothelial growth factor(VEGF) • proinflammatory cytokines(TNF-a, IL-1) • vascular cell adhesion molecule-1(VCAM-1) • advanced glycosylation end product(AGE)
※ HG OS NF-kB regulate gene expression
• HG & endothelial cell • HGadhesion&transmigration of monocytes • HGsuperoxide endothelial disfunction • HGendothelial cell growth glutathione, SOD, catalase
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Association of free radicals and advanced glycosylation end products
• glucose+proteinglycosylation products(Schiff bases&Amadori products)
H2O2 sources of superoxide radical
Amadori product carboxymethyl-lysine• free radical reaction • AGEsOSNF-kBendothelin-1&tissue factor endothelial disfunction V-E-------completely SOD-------partially LPO-catalyzed by glycated polylysine catalase----no
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• HGAGE13.8fold ----- in endothelial cell
• HG or AGEapoptosis -----in HUVAC cell inhibited by a-LA
• AGE inhibitor---diabetic complications
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Evidence for an enhanced oxidative stateIn diabetes mellitus
DM-OS •uncontrolled DM--SOD
•type1DM--------superoxide anion production -LDL oxidation antioxidant defence
• poorly controlled type2 DMthiobarbituric acid
• 적혈구 막 T1DM----LPO T2DM----lipid MDA (8~10fold)
• 초기 DM renal desease-urinary excretion of 12-HETE
• DM atherosclerosis-OS & 12-LO expression
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• poorly controlled T1DM-NF-kB antioxidant--NF-kB albuminuria ---NF-kB binding activity
• DM---antioxidant defenses T1DM---total antioxidant capacity T1,2DM- SOD (2fold) T2DM- -glutathione
• enhanced OS is present in target organs during the development of DM complications DM nephropathy---OS---NF-kB
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Nitric oxide: effects of diabetes mellitus
• rat&rabbit HG-aorta relaxation NO reverse
blockade of PKC & SOD
• HG--ATPase reverse HG effect is secondary to NO L-arginine or sodium nitroprusside
• STZ- DM rat - OS was associated with eNOS&nNOS
• in human T2DM-NO action (hyperlipidemia, insulin resistance, hypertension, altered ions(Ca, Mg),
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• DM influence NO action and metabolism
• superoxide anione+NO=peroxinitrite membrane damage&LPO
• AGEsNO action
• aminoguanidine(inhibitor of NO) AGE NO production NOS (no action)
Normalizes DM-induced vascular dysfunction
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Therapeutic implications of antioxidants for the prevention of diabetic complications
• OS (hyperglycemiaDM complication) ※ V-E prevent vascular disease in nondiabetic subject V-E- DM?
※ LA-NF-kB (induced by TNF-a and AGE) LA-OS prevent DM nephropathy, neuropathy, retinopathy
※ coenzyme Q10 superoxide improve endothelial function• insulin and vascular complication low PI3K eNOS vasodilation high c-myc, MAPK, cell growth may have proatherogenic action• diet and vascular complication oxidized lipids in the diet magnesium deficiency
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Inflammation and macrovascular diabetic complication
Oxidised LDL, AGE, chronic infection
IL-1, IL-6, TNF-a
Increased monocyte adhesionAtherosclerotic plaque rupture
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• HGinflammation, OSmonocyte adhesion
• endothelial cell IL-8
• adhesion molecular ※ ICAM, VCAM, E-selection, P-selection ※ ligands—LFA-1, Mac-1, VLA-4, PSGL-1 ※ soluble cell adhesion molecules (sCAMs)—T2DM death risk
• TNF-a, IL-6 acute-phase proteinsC reactive protein(CRP)
Inflammatory stimuli
endothelial cell monocyte intera
ctionAP-1,CHO-RE Oxidized LDL, TNF-a
Marker Myocardial infarction and stroke
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Role of PPARs
• PPAR- and proinflammatory cytokine atherosclerosis
• TNF-a, IL-1a and , IL-6 decrease PPAR- in adipocytes IL-4 induces PPAR- in monocytes 9-and 13-HODE increase PPAR- mRNA in macrophages
• TZDs effect • ROS • PAI-1 • CCR2 • VSMC proliferation
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Role of the Renin-Angiotensin system
• angiotensin II AP-1, STAT family, NF-kB
•ACE-inhibitor VCAM-1 in T2DM
•ACE inhibitor myocardial infarction, stroke, cardiac arrest, heart failure, and mortality
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conclusion
OS and inflammation have an important role in the development of Diabetic microvascular
and macrovascular complications