Abstract
B lymphocytes and their differentiated daughter cells are charged with responding to invading pathogens and producing protective antibodies against these pathogens. The physiology of B cells is intimately connected with the function of the B cell antigen receptor (BCR). Upon activation of BCR, transmembrane signals are generated, and several downstream pathways are activated, which provide a primary directive for the cell's subsequent response. mTOR is a serine/threonine kinase that controls cell proliferation and metabolism in response to a diverse range of extracellular stimuli. The activation of mTOR signaling downstream of PI3K/Akt activity by B cell receptor (BCR) engagement has been generally assumed to be essential for B cell responses. This chapter seeks to present two protocols to evaluate mTOR activity in B cells bearing BCR specific to 4-hydroxy-3-nitrophenylacetyl (NP)-hapten.
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