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Activation of p42/p44 mitogen-activated protein kinases (MAPK) and p38 MAPK by tumor necrosis factor (TNF) is mediated through the death domain of the 55-kDa TNF receptor



Activation of p42/p44 mitogen-activated protein kinases (MAPK) and p38 MAPK by tumor necrosis factor (TNF) is mediated through the death domain of the 55-kDa TNF receptor



FEBS Letters 441(2): 275-280



In the mouse fibrosarcoma cell line L929sA, tumor necrosis factor (TNF) stimulates activation of the stress-responsive p38 mitogen-activated protein kinase (MAPK), as well as the classical p42 and p44 MAPK. TNF signaling can be mediated by p55 or p75 TNF receptors. Here, we demonstrate that TNF-R55 is sufficient to activate p42/p44 MAPK and p38 MAPK. Moreover, by expressing different membrane-bound or purely cytoplasmic truncations of TNF-R55, we show that the intracellular death domain of TNF-R55 is the crucial domain involved. The cytoplasmic membrane-proximal region of TNF-R55, known to induce neutral sphingomyelinase activation, is not required for activation of p38 MAPK or p42/p44 MAPK.

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Accession: 010121337

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DOI: 10.1016/s0014-5793(98)01567-1


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