T Cell mediated Immunity - German 2017 - From Cutler Flashcards
What pathogens do CD4 Th2 cells target?
-Helminth-Parasites
What pathogens do CD4Th17 cells target?
-Klebsiella pneumoniae-Fungi
Are the CD8 or CD4 T cells the regulatory T cell arm?
-CD4
Are the CD8 or CD4 T cells the direct effector T cell arm?
-CD8
What is the most common T cell activator?
-Dendritic Cells
For a dendritic cell to actually do its job what needs to happen to it?
-Needs to be activated
Dendritic Cells mature through what?
-Antigen Activation
When dendritic cells take up bacterial antigen in the skin how do the move to a lymph node?
-Enter the lymphatic system
T/F Antigen presenting cells distribute differently in lymph nodes
True
How do Dendritic cells present antigen?
-Via MHC I and MHC II
T/F MHC can present self antigen
True
Which of the following do not activate MHC class II and CD4 T cells?A) Receptor mediated endocytosisB) Macropinocytosis of bacteria or virusesC) Viral infection
C) Viral infection
What is critical for CD8 T cell activation?
-Cross-presentation
Where are circulating Naive T cell exposed to antigens at?
-Lymph nodes
What are two ways that Naive T cells can enter a draining lymph node?
-Blood-Afferent lymph coming from an upstream lymph node
What two types of cells help from an immune synapse?
-T cels-Dendritic Cells
What three signals do T cells need to become activated?
-T cell Receptor-Co-Stimulatory Molecules-Cytokines
Cytokines lead to differentiation, IL-2 leads to the proliferation of what cells?
-CD8, All Th cells
Cytokines lead to differentiation, IL-4 leads to the proliferation of what cells?
-Th-2
Cytokines lead to differentiation, IL-6 leads to the proliferation of what cells?
-TFH
Cytokines lead to differentiation, IL-12 leads to the proliferation of what cells?
-TH1
Cytokines lead to differentiation, TGF-Beta + IL-16 + IL-23 leads to the proliferation of what cells?
-TH 17
Where is B7 expressed?
-Only on antigen presenting cells that have been activated
Cytokines lead to differentiation, TGF-Beta leads to the proliferation of what cells?
-T-reg
What does Naive T cell TCR activation in the absence of co-stimulation lead to?
-Anergy
Why is co-stimulation of T cell activation so important?
-If you get T cell activation without the B7 co-stimulator it can lead to an autoimmune disease
What two types of cells can CD8 T cells be differentiated into?
-Effector Cells-Memory Cells
After you have T cell activation and differentiation what occurs next?
-Clonal expansion