Bio Lecture 6 Cell Communication

Bio Lecture 6 Cell Communication - Lecture 6: Cell...

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Lecture 6: Cell communication Wednesday 10/7/09 Bio 93, Fall 2009 Reading pages: 102-108
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Cell to cell communication Essential for multicellular organisms Cells must communicate to coordinate their activities. Communication between cells is also important for many unicellular organisms. Cell signaling mechanisms have been highly conserved
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Cell signaling summary Three stage process
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1. Secreted signals that act locally Growth factors Neurotransmitters Four classes of signal molecules mediating intercellular communication
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2. Secreted signals that act at distant sites Hormones Travel to target cells at distant sites Animal cells: travel in circulatory system Plants: travel in vessels, cell to cell, or diffusion in air
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3. Intracellular signals 4. Cell surface signals • Example: FC receptors on white blood cells –Bind to antibodies bound to surface of bacteria –Stimulates phagocytosis WBC bacteria antibody
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Signal Reception Signal (ligand) binds to receptor
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Bio Lecture 6 Cell Communication - Lecture 6: Cell...

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