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HPK1, a hematopoietic protein kinase activating the SAPK/JNK pathway.


ABSTRACT: In mammalian cells, a specific stress-activated protein kinase (SAPK/JNK) pathway is activated in response to inflammatory cytokines, injury from heat, chemotherapeutic drugs and UV or ionizing radiation. The mechanisms that link these stimuli to activation of the SAPK/JNK pathway in different tissues remain to be identified. We have developed and applied a PCR-based subtraction strategy to identify novel genes that are differentially expressed at specific developmental points in hematopoiesis. We show that one such gene, hematopoietic progenitor kinase 1 (hpk1), encodes a serine/threonine kinase sharing similarity with the kinase domain of Ste20. HPK1 specifically activates the SAPK/JNK pathway after transfection into COS1 cells, but does not stimulate the p38/RK or mitogen-activated ERK signaling pathways. Activation of SAPK requires a functional HPK1 kinase domain and HPK1 signals via the SH3-containing mixed lineage kinase MLK-3 and the known SAPK activator SEK1. HPK1 therefore provides an example of a cell type-specific input into the SAPK/JNK pathway. The developmental specificity of its expression suggests a potential role in hematopoietic lineage decisions and growth regulation.

SUBMITTER: Kiefer F 

PROVIDER: S-EPMC452527 | biostudies-other | 1996 Dec

REPOSITORIES: biostudies-other

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HPK1, a hematopoietic protein kinase activating the SAPK/JNK pathway.

Kiefer F F   Tibbles L A LA   Anafi M M   Janssen A A   Zanke B W BW   Lassam N N   Pawson T T   Woodgett J R JR   Iscove N N NN  

The EMBO journal 19961201 24


In mammalian cells, a specific stress-activated protein kinase (SAPK/JNK) pathway is activated in response to inflammatory cytokines, injury from heat, chemotherapeutic drugs and UV or ionizing radiation. The mechanisms that link these stimuli to activation of the SAPK/JNK pathway in different tissues remain to be identified. We have developed and applied a PCR-based subtraction strategy to identify novel genes that are differentially expressed at specific developmental points in hematopoiesis.  ...[more]

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