TY - JOUR
T1 - Tight control of MEK-ERK activation is essential in regulating proliferation, survival, and cytokine production of CD34+-derived neutrophil progenitors
AU - Geest, Christian R.
AU - Buitenhuis, Miranda
AU - Groot Koerkamp, Marian J.A.
AU - Holstege, Frank C.P.
AU - Vellenga, Edo
AU - Coffer, Paul J.
PY - 2009
Y1 - 2009
N2 - A plethora of extracellular stimuli regulate growth, survival, and differentiation responses through activation of the MEKERK MAPK signaling module. Using CD34+ hematopoietic progenitor cells, we describe a novel role for the MEK-ERK signaling module in the regulation of proliferation, survival, and cytokine production during neutrophil differentiation. Addition of the specific MEK1/2 inhibitor U0126 resulted in decreased proliferation of neutrophil progenitors. Conversely, transient activation of a conditionally active MEK1 mutant resulted in the expansion of progenitor cells, which thereafter differentiated normally into mature neutrophils. In contrast, chronic MEK1 activation was found to induce cell death of CD34+ neutrophil progenitors. Microarray analysis of CD34+ progenitor cells showed that activation of MEK1 resulted in changes in expression of a variety of cell-cycle modulating genes. Furthermore, conditional activation of MEK1 resulted in a dramatic increase in the expression of mRNA transcripts encoding a large number of hematopoietic cytokines, chemokines, and growth factors. These findings identify a novel role for MEK-ERK signaling in regulating the balance between proliferation and apoptosis during neutrophil differentiation, and they suggest the need for tight control of MEK-ERK activation to prevent the development of bone marrow failure.
AB - A plethora of extracellular stimuli regulate growth, survival, and differentiation responses through activation of the MEKERK MAPK signaling module. Using CD34+ hematopoietic progenitor cells, we describe a novel role for the MEK-ERK signaling module in the regulation of proliferation, survival, and cytokine production during neutrophil differentiation. Addition of the specific MEK1/2 inhibitor U0126 resulted in decreased proliferation of neutrophil progenitors. Conversely, transient activation of a conditionally active MEK1 mutant resulted in the expansion of progenitor cells, which thereafter differentiated normally into mature neutrophils. In contrast, chronic MEK1 activation was found to induce cell death of CD34+ neutrophil progenitors. Microarray analysis of CD34+ progenitor cells showed that activation of MEK1 resulted in changes in expression of a variety of cell-cycle modulating genes. Furthermore, conditional activation of MEK1 resulted in a dramatic increase in the expression of mRNA transcripts encoding a large number of hematopoietic cytokines, chemokines, and growth factors. These findings identify a novel role for MEK-ERK signaling in regulating the balance between proliferation and apoptosis during neutrophil differentiation, and they suggest the need for tight control of MEK-ERK activation to prevent the development of bone marrow failure.
UR - http://www.scopus.com/inward/record.url?scp=70350727161&partnerID=8YFLogxK
U2 - 10.1182/blood-2008-08-175141
DO - 10.1182/blood-2008-08-175141
M3 - Article
C2 - 19667405
AN - SCOPUS:70350727161
VL - 114
SP - 3402
EP - 3412
JO - Unknown Journal
JF - Unknown Journal
IS - 16
ER -