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RAPID COMMUNICATION
Activation of p38 MAP Kinase Pathway by Erythropoietin and Interleukin-3
Yuka Nagata,
Tetsuo Moriguchi,
Eisuke Nishida, and
Kazuo Todokoro
From the Tsukuba Life Science Center, The Institute of Physical and Chemical Research (RIKEN), Koyadai, Tsukuba, Ibaraki, Japan; and Institute for Virus Research, Kyoto University, Kyoto, Japan.
Activation of p38 MAP kinase (p38) as well as JNK/SAPK has been described as being induced by a variety of environmental stresses such as osmotic shock, ultraviolet radiation, and heat shock, or the proinflammatory cytokines tumor necrosis factor- and interleukin-1 (IL-3). We found that the hematopoietic cytokines erythropoietin (Epo) and IL-3, which regulate growth and differentiation of erythroids and hematopoietic progenitors, respectively, also activate a p38 cascade. Immunoblot analyses and in vitro kinase assay clearly showed that Epo and IL-3 rapidly and transiently phosphorylated and activated p38 in Epo- or IL-3-dependent mouse hematopoietic progenitor cells. p38 can generally be activated by the upstream kinase MKK3 or MKK6. However, in vitro kinase assays in the immunoprecipitates with anti-MKK6 antibody and anti-phosphorylated MKK3/MKK6 antibody showed that activation of neither MKK3 nor MKK6 was detected after Epo or IL-3 stimulation, while osmotic shock clearly induced activation of both MKK3/MKK6 and p38. Together with previous observations, these results suggest that both p38 and JNK cascades play an important role not only in stress and proinflammatory cytokine responses but also in hematopoietic cytokine actions.
Blood, Vol. 90 No. 3 (August 1), 1997:
pp. 929-934
© 1997 by The American Society of Hematology.

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