BIOL 134 Lecture Notes - Lecture 21: Cytotoxic T Cell, Natural Killer Cell, Memory T Cell

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26 Oct 2016
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B cells act by distributing soluble antigens into the body. Antibodies best defend against pathogens in the blood/lymph. T cells can respond to intracellular pathogens. Also involved in humoral immunity (helps b cells mature) T cells also act as alarm systems, calling for help from other cells. T cells are produced in the marrow and mature in the thymus. Cells that circulate in our blood and lymph. Each t cell carries one type of t cell receptor (tcr) Tcrs are never produced in a soluble form, unlike antibodies. Respond to tcr binding by sending out chemical signals. Help activate b cells, cytotoxic t cells, macrophages, etc. Long-lived cells produced after tcr exposure to antigen. Create more rapid responses to future exposures. Scans our own cells for improper proteins. A(cid:271)se(cid:374)(cid:272)e of (cid:862)(cid:374)or(cid:373)al(cid:863) protei(cid:374)s = kills (cid:272)ell. Prese(cid:374)(cid:272)e of (cid:862)a(cid:271)(cid:374)or(cid:373)al(cid:863) protei(cid:374)s = kills (cid:272)ell. Presence of bound antibodies = kills cell. Unlike natural killers, ct cells probe our own cells.

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