BIOL341 Study Guide - Final Guide: Mesenteric Lymph Nodes, Lamina Propria, Memory B Cell

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5 Aug 2016
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Biology 341: fundamentals of immunology final exam review. Extravasation: movement of wbcs from the blood stream (capillaries) to the tissues surrounding them (migrate between endothelial cells to gain access to the inflamed, underlying tissue). Occurs in 4 steps: rolling: mediated by selectins (adhesion molecules) Leukocytes attach loosely to the endothelium by a low-affinity selectin-carbohydrate interaction. In an inflammatory response, cytokines act on the local endothelium to upregulate expression of adhesions. Selectin molecules on a neighbouring endothelial cell tether the leukocyte; tumbles over, process repeats: activation: mediated by chemokines (integrin adhesion molecules are enhanced by cytokines) Chemokine binds to chemokine receptor on the leukocyte causing signal transduction events leading to the clustering of integrins (e. g. lfa-1) on the leukocyte: arrest and adhesion: mediated by integrins binding to ig-family members. After a pathogen is encountered: innate immunity has two roles: initiate clearance or killing of pathogen. >95% of infections are dealt with by the innate immune system: alert the adaptive immune system.

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