Abstract
Signaling molecules such as p21ras (Ras), mitogen-activated protein kinase (MAPK), and Akt kinase play pivotal roles in the proliferation and survival of lymphoid cells in response to many kinds of stimulation. It is not fully understood, however, how these molecules participate in the growth of malignant lymphoid cells.We determined whether Ras, MAPKs such as extracellular signal-regulated kinase (ERK), c-Jun amino-terminal kinase (JNK), and p38 MAPK, and Akt kinase are activated in B-cell tumors, including acute lymphoblastic leukemia, chronic lymphocytic leukemia, Burkitt-like lymphoma, diffuse large B-cell lymphoma, and plasma cell leukemia.We found that Lyn protein tyrosine kinase was constitutively phosphorylated on tyrosine, and that ERK and p38 MAPK were constitutively active in all cases of the B-cell tumor. In contrast, activation of Ras and Akt kinase was found in limited cases, and JNK kinase activity was not observed in any case. These results suggest that ERK and p38 play roles in the oncogenesis of B-cell tumors.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF03191330.
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Ogasawara, T., Yasuyama, M. & Kawauchi, K. Constitutive Activation of Extracellular Signal-Regulated Kinase and p38 Mitogen-Activated Protein Kinase in B-Cell Lymphoproliferative Disorders. Int J Hematol 77, 364–370 (2003). https://doi.org/10.1007/BF02982645
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DOI: https://doi.org/10.1007/BF02982645