TNF-alpha treatment of prostate carcinoma, LNCAP cells decreases cell survival as shown in the graph below. Which of the following would you observe in these cells treated with TNF- alpha? Select all that apply TNF-a 120 100 - 80 - 60- 40 20 - 24 72 (hrs) • Control - TNF-a 10 ng + TNF-a 100ng O Activation of extrinsic pathway of apoptosis O Activation of intrinsic pathway of apoptosis Activation of executioner caspases Recruitment of adapter protein FADD to the TNF-alpha receptor LNCAP cell viability (% of control)

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.