biomedis imunsistem (1)
DESCRIPTION
biomedis imunsistemTRANSCRIPT
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Immune System
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necessity of recognition of and discrimination between SELF and FOREIGN
Evolution of effector functions for maintaining SELF and destruction of FOREIGN
Principles of the Immune System
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failure of recognition of and discrimination between
SELF and FOREIGN:
1) Loss of identity (absorbtion, death) 2) Horror autotoxicus (autoimmunity) 3) Collateral damage
Principles of the Immune System
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Immunology
Latin: Immunis, immunitas = free of duties/taxes
Protection/surveillance of HOST against: 1) Infectiones (Pathogenes) 2) Toxines (biological + chemical) 3) altered SELF: tumours 4) removal of death SELF cells (e.g. after apoptosis) 5) Transplantes 6) fetus (=transplant, parasite)
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Parts of the Immune System
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Innate Adaptive
- NO memory -prompt/fast
- unspecific
- memory - needs to be generated after 1st contact - specific
humoral cellular
Complement Antibodies
Phagocytes Lymphocytes (T und B)
Parts of the Immune System
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Blood smear
O,14%
4,7%
95 %
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Phagocytes
Polymorphonuclear Granulocytes
Named after staining of Granula
Neutrophils Eosinophils Basophils
Monocytes
Differentiate into M or DC
>90% 2-5% 0,1-1% Parasites Allergies Bakterien/Fungi
Degranulation Phagozytosis
Bakterien/fungi Phagozytosis
Antigenpresentation
60-70% 10%
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Phagocytes
Polymorphonuclear Granulocytes
Named after staining of Granula
Neutrophils Eosinophils Basophils
Monocytes
Differentiate into M or DC
>90% 2-5% 0,1-1% Parasites Allergies Bakterien/Fungi
Degranulation Phagozytosis
Bakterien/fungi Phagozytosis
Antigenpresentation
60-70% 10%
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Phagocytosis
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Lymphocytes
T cells B cells NK cells
60% 2-5% 10%
innate adaptive Bone marrow
plasma cells
CD16, CD56 CD3 CD19
Antibody secretion Cell killing Cell killing
CD4 T helper=TH
CD8 T cytotoxic=Tc
Immune regulation
Antibody maturation
Percentage of PBMCs
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Lymphocytes
T cells B cells NK cells
60% 2-5% 10%
innate adaptive Bone marrow
plasma cells
CD16, CD56 CD3 CD19
Antibody secretion Cell killing Cell killing
CD4 T helper=TH
CD8 T cytotoxic=Tc
Immune regulation
Antibody maturation
Percentage of PBMCs
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Lymphocytes
T cells B cells NK cells
60% 2-5% 10%
innate adaptive Bone marrow
plasma cells
CD16, CD56 CD3 CD19
Antibody secretion Cell killing Cell killing
CD4 T helper=TH
CD8 T cytotoxic=Tc
Immune regulation
Antibody maturation
Percentage of PBMCs
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First line defences of the immune system
pathogen
What does protet us
Before
the pathogen can enter the 2ssue?
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First line defences of the immune system
pathogen
physical/ chemical barrier of skin and mucosa
Acid enviroment skin/stomach (pH 5,5): antifungal mucosa; cilia competition (commensal versus pathogen) Bacteriocidal Substances (enzymes, defensins) in secreted fluids (saliva, sudor,lachrymal) sIgA
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Main principles
pathogen
Avoidance of adhesion
bacteriocidal
Acid enviroment skin/stomach (pH 5,5): antifungal mucosa; cilia competition (commensal versus pathogen) Bacteriocidal Substances (enzymes, defensins) in secreted fluids (saliva, sudor,lachrymal) sIgA
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Bacteriocidal substances in secreted fluids Enzymes: lysozyme
murein degradation peroxidase killing by radicals lactoferrin Fe competition
Bacteriocidal peptides: -defensines
-defensines Cathelicidin (LL-37) Histatins membrane penetration influence of bacterial functions
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Structural classes of defensines
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Defensin
12 50 aa, bermuatan posi=f, memiliki domain hidrofobik dan amphipha=k.
Broad spectrum an=microbial ac=vi=es Bakteri gram + dan Fungi (inc. yeast) Parasit (protozoa, nematoda) Enveloped virus (HIV)
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Defensin
Protein paling banyak di Neutrophils Kill phagocytosed pathogens
How ? Unsure Merusak integritas membran. Selek=tas : membrane yang =dak mengandung kolesterol.
Berguna sebagai agent terapeu=k.
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Defensines: induction and immunmodulation
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Clinical case A 16 year old boy has an small accident with a scratch at the right foot. Few Hours later: around the wound 3 cm Erythema with swelling/edema. Wound and surrounding appears to be warmer and painful.
Rubor redness
Tumor swelling
Calor warming
Dolor pain
Functio laesa loss of function
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1.Phase: reaction of local inflammation
Plasma enzymes
Complement
Bradykinin
Activation of
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pathogen Physical/ chemical barrier of the skin and mucosa
1) wound repair (clotting, Thrombocytes, angiogenesis) 2) Activation of Plasma enzymes
Bradykinin dolor=pain complement
Kill/Lyse pathogen
Mediators Anaphylatoxine
Chemotaxis Mark target (opsonization)
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Kallikrein-Kinin-System
Coagulation
Faktor XII (Hagemann)
Pre-kallikrein
Kallikrein
Kininogen Kinine (Bradykinin,
Kallidin)
Plasmin Trypsin Bacterielle Enzymes Snake poisson
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Complement System
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complement
MBLectin pathway
C3
C3b C4 C2
C3 convertase C4b2b
MBL
C5
Pathogene surface
Membrane attacking complex
MAC
(C9)n
C3 convertase C3b,Bb
Alternative pathway
Incorporation into Pathogenic membrane
(pores, lysis)
C3 C3a
C5b
C5 Convertase: C3b,Bb plus C3b C4b2b plus C3b
C3 C5a
Ana
laph
ylat
oxin
e
Plasmaproteases Antibody
Classical pathway
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complement
MBLectin pathway
C3
C3b C4 C2
C3 convertase C4b2b
MBL
C5
Pathogene surface
Membrane attacking complex
MAC
(C9)n
C3 convertase C3b,Bb
Alternative pathway
Incorporation into Pathogenic membrane
(pores, lysis)
C3 C3a
C5b
C5 Convertase: C3b,Bb plus C3b C4b2b plus C3b
C3 C5a
Ana
laph
ylat
oxin
e
Plasmaproteases Antibody
Classical pathway
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Plasma enzymes
Mast cells
Activation of
1.Phase: reaction of local inflammation
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Mast cell activation
Degranulation (few minutes)
C3a C5a
Mast cells (Basophile Eosinophile)
activated Complement
Histamin
Vasodilatation
itching
Nerve cells
Anaphylatoxines
Dolor pain
Endothelial cells
Pre-formed Bradykinin
Rubor redness
Tumor swelling
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anaphylactic shock
Degranulation
C3a C5a
Mast cells (Basophiles
Eosinophiles)
Komplement activation
Histamin
Vasodilatation
Blood pressure
Shock IgE crosslinking
FcR
Bradykinin Endothelial gap junctions
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Plasma enzymes
Mast cells
macrophages
Activation of
1.Phase: reaction of local inflammation
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Pathogenes
Bacterias Viruses fungis Parasites
Who is recognized as Aliens?
Protoazoas helminth Milben
Gram + Gram Extracellular (z.B. Staphylococcus) Intracellular (e.g. Mycobacterias) Gut flora?
dsRNA ssRNA dsDNA ssDNA
Candida aspergillus
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What is recognised as alien?
What is distinguishing us from pathogens??
Pathogenes
Bacterias Viruses fungis Parasites
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Pathogen associated molecular patterns (PAMPS)
What is distinguishing us from pathogens??
Pathogenes
Bacterias Viruses fungis Parasites
What is recognised as alien?
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Pathogene Human
Cell wall cell membrane DNA not methylated DNA methylated Mannose-rich cell surface rather Galactose outside Poly-Aniones insight Formyl-Residue Start-Methionin naked or
cut off
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Bacteria:
Viruses: dsRNA ssRNA dsDNA ssDNA
Protozoa: surface glycans lipids HSPs
Metazoa Glycans
What is recognised as alien?
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Toll-like receptor (TLR)
The most important and best-understood receptors in the innate system.
10 TLRs iden=ed in human toll-like : receptor Toll in Drosophila
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TLR Large domain: Leucine-rich repeats (LRRs) Human LRR: 18-27 repeats Single transmembrane helix Signaling domain (common to TLR and other receptors)
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Lipopolysaccharide (LPS)
LPS recognize by TLR-4 Protein agelin : TLR-5 ddRNA : TLR-3
The target of TLR is a key component of the pathogen. Muta=on cannot easily block recogni=on by TLR TLR for heterodimers : enhance or inhibit PAMP
recogni=on.
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hTLR3