Immunopharm - inflammation and immunosuppression Flashcards
- The role of the immune system is?
- Innate: reactivity? affinity?
- Adaptive: specificity?
- Role is to distinguish “self” from “nonself” and protect the organism from nonself or infectious agents
- Broad reactivity, and low affinity
- Highly antigen-specific
Innate Cells:
- How do they defend?
- Secretions?
- Conferrence of long lasting immunity?
Innate Cells:
- Defend by neutralizing or phagocytosis
- Secrete cytokines/inflammatory modulators
- Does NOT confer long lasting immunity to the host
Innate Cells:
What are the 6 innate cells?
Innate Cells:
a. neutrophils
b. basophils
c. eosinophils
d. mast cells
e. macrophages
f. NK cells
Cytokines:
- What do cytokines bind to?
- What do chemokines bind to? What are the chemokines?
- 3 “types” of cytokines?
Cytokines:
- Cytokines bind to tyrosine kinases
- Chemokines bind to G-protein coupled receptors; CCL, CXCL, and XCL
- lymphokines (TNF, IFN), interleukins, and chemokines
Adaptive cells:
- Distinguish cells and ____ factors as self.
- Humoral immunity?
- Cellular immunity? Recognize and ___ specific pathogens
- Role of Helper T cells?
Adaptive cells:
- Distinguishes cells and soluble factors as self
- B lymphocytes: IgG, IgA, IgM, IgE, IgD
- T lymphocytes: Recognize and remember specific pathogens
- Helper T: regulate/suppress adaptive immunity
Function:
- Dendritic cell?
- Neutrophil?
- Basophil and mast cell?
Function:
- APC to stimulate T cell in lymph nodes
- Phagocytosis, particularly bacteria
- Bind IgE antibody and release histamine and other inflammatory mediators
Function:
- Tc cell? CD? MHC?
- Th cell? CD? MHC?
Function:
- Mediator of cellulary adaptive immunity - secretes perforins and granzymes to kill APCs; CD8; MHC-I
- Controls immune responses; produces cytokines that activate phagocytic cells; CD4; MHC-II
B lymphocyte activation:
B cell ___ antigen and digests it. Presents Ag, via ___, to ___ __ cell. The mature T cell produces cytokines for ___ of the B cell. ____ cell secretes Abs that bind matching Ags. This complex is cleaved by ___ or the spleen/___.
B lymphocyte activation:
B cell engulfs antigen and digests it. Presents Ag, via MHC, to mature T cell. The mature T cell produces cytokines fo the maturation of the B cell. Plasma cell secretes Abs that bind matching Ags. This complex is cleaved by compliment or the spleen/liver.
T lymphocyte activation:
T cells are mobilized. Encounters a ____ cell or __ cell with digested antigen with ___ display of the antigen. Cytokines from ___ and ___ cells help T cell mature. ___-Ag complex activates T cell ____ and the T cell secretes cytokines. Some cytokines induce ___ ___ cells. Some induce ____ T cells and track down cells infected with _____. Some become ___ T cells that secrete additional cytokines to ___ other immune cells.
T lymphocyte activation:
T cells are mobilized. Encounters a dendritic cell or B cell with digested antigen with MHC display of the antigen. Cytokines from dendritic and B cells help T cell mature. MHC-Ag complex activates T cell receptors and the T cell secretes cytokines. Some cytokines induce more T cells. Some induce cytotoxic T cells and track down cells infected with viruses. Some become helper T cells that secrete additional cytokines to attract other immune cells
IgA:
- Location?
- Function?
- Some people ____ make IgA
IgA:
- Nose/airway, GI, ears, eyes, vagina
- Protect body surfaces exposed to outside
- Some people DONT make IgA
IgG
- Location?
- Function?
- What is special about IgG?
IgG
- All body fluids
- Fight bacterial/viral infection
- IgG is the ONLY antibody that can cross placenta
IgM:
- Location?
- Function?
- Special note?
IgM:
- Blood and lymph
- Made in response to infection and cause other immune cells to be activated
- First line of defense
IgE:
- Location?
- Function?
IgE:
- Lung, skin, and mucous membranes
- Fight allergens
Hypersensitivity:
5 types?
Hypersensitivity:
a. Allergy
b. Cytotoxic, Ab-dependent
c. Immune complex
d. DTH: ab-independent and CMI
e. Autoimmune disease
Hypersensitivity:
- Allergy: examples? Ab?
- Cytotoxic, ab-dependent: examples? Ab?
- IC: examples? Ab
Hypersensitivity:
- Allergy: asthma, atopy, anaphylaxis; IgE
- Cytotoxic: Thrombocytopenia and autoimmune HA; IgM and IgG
- IC: serum sickness, RA, SLE; IgG
Hypersensitivity:
- DTH: examples? Response cells?
- Autoimmune: examples? Ab?
Hypersensitivity:
- DTH: contact dermatitis, MS, transplant rejection; T cells
- Autoimmune: graves, myasthenia gravis; IgM, IgG
Allergic reaction:
Initial contact with allergen causes ___ lymphocytes to produce _____. T cells interact with B cells that produce ____. Secreted ___ binds to mast cells and ____ –> ____. Later exposure to same allergen; allergen binds to ___ and activates ___ ___ and basophils. _____ –> release of histamine, cytokines, _____, leukotrienes and ______. The body response is vasodilation, ___ secretion, ____ stimulation, and smooth muscle ____.
Allergic reaction:
Initial contact with allergen causes T lymphocytes to produce IL-4. T cells interact with B cells that produce IgE. Secreted IgE binds to mast cells and basophils –> **sensitization**. Later exposure to same allergen; allergen binds to IgE and activates mast cells and basophils. Degranulation –> release of histamine, cytokines, interleukins, leukotrienes, and prostaglandins. The body response is vasodilation, mucous secretion, nerve stimulation, and smooth muscle contraction
Chronic inflammatory disease examples?
Peptic ulcer disease, asthma, osteoarthritis, and gout
Phases of the inflammatory response:
What are the 5 phases?
Phases of the inflammatory response:
a. vasodilation
b. plasma extravasation
c. slowing of blood flow (stasis)
d. leukocyte infiltration
e. Wound healing
Phases of the inflammatory response:
Leukocyte infiltration:
4 stages?
Phases of the inflammatory response:
Leukocyte infiltration:
a. chemoattraction
b. rolling
c. tight adhesion
d. transmigration
Phases of the inflammatory response:
Leukocyte infiltration:
- What is responsible for chemoattraction? What do endothelial cells express?
- What occurs in tight adhesion?
Phases of the inflammatory response:
Leukocyte infiltration:
- Macrophages release IL-1, TNF, and chemokines; endothelial cells express adhesion molecules, ICAMs, and selectins
- In tight adhesion, integrins are activated by PAF and bind ICAMs on endothelium
Mediators that cause vasodilation?
a. PGs (PGI/E/D)
b. NO
c. histamine
Mediators that increase vascular permeability?
a. Histamine
b. C3a and C5a
c. Bradykinin
d. LTs: LTC/D/E
e. PAF
Chemotaxis and leukocyte activation mediators?
Chemotaxis and leukocyte activation:
a. C5a
b. LTG4, LXA4, LXB4
c. Bacterial antigens
Tissue damage mediators?
Tissue damage mediators:
a. Neutrophil/macrophage lysosomal products
b. Oxygen radicals
c. NO
Mediators of fever?
Fever mediators:
a. IL-1
b. IL-6
c. TNF
d. PGE2
Pain/hypersensitivity mediators?
Mediators of pain/hypersensitivity:
a. PGE2/PGI2
b. Bradykinin
c. Tryptase
d. ATP
2 strategies for drugs that target the immune system?
2 strategies for drugs that target the immune system:
a. Attenuate signaling mediators
b. Modifying the underlying stimulus and thus removing the cause of the inflammation
Drug strategies for suppressing immunity/inflammation:
Drug example:
- Inhibition/activation of gene expression?
- Blockade of intracellular signalling?
- Costiumlation modulation?
Drug strategies for suppressing immunity/inflammation:
Drug example:
- Glucocorticoids inhibit/activate gene expression
- Cyclosporine/tacrolimus blocks intracellular signalling
- Abatacept inhibits co-stimulation of T cells