MICB 202 Lecture Notes - Lecture 98: Lymph Node, Mhc Class Ii, Adaptive Immune System

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10 Sep 2016
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Moving the immune response to the lymph node - dendritic cells link the innate and adaptive immune responses. The pathogen (and blood fluids) is pushed towards the lymphatic vessel by the blood pressure. The adaptive immune response in the lymph node - ab response. The pathogen enters the lymph node, encounters the b cells. Pathogen eventually encounters the b cell that has the bcr that is complementary to it - signal 1 to the b cell. B cell presents mhc ii - pathogen derived peptide to t helper cell, cd40 on b cell binds to cd40l on t helper cell, b cell receives signal 2 and cytokines. Effector t helper cells form - these are important to fully activate b cells - they start to make cd40l. Class switching - secreting different classes of antibodies. Dendritic cells re-activate the memory t helper cells. B cells receive t helper cell help - proliferate and differentiate.

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