Cited by 161Retinoids in leukemia and cellular processesProtein Kinase Regulation and GTPase SignalingProtein Tyrosine Phosphatases

Activation of Rac1 and the p38 Mitogen-activated Protein Kinase Pathway in Response to All-trans-retinoic Acid

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Alsayed, Yazan, Uddin, Shahab, Mahmud, Nadim, Lekmine, Fatima, Kalvakolanu, Dhananjaya V., Minucci, Saverio, Bokoch, Gary, Platanias, Leonidas C.·2001·Journal of Biological Chemistry

Abstract

Several signaling pathways are activated by all-trans-retinoic acid (RA) to mediate induction of differentiation and apoptosis of malignant cells. In the present study we provide evidence that the p38 MAP kinase pathway is activated in a RA-dependent manner in the NB-4, acute pro-myelocytic leukemia, and the MCF-7, breast carcinoma, cell lines. RA treatment of cells induces a time- and dose-dependent phosphorylation of p38, and such phosphorylation results in activation of its catalytic domain. p38 activation is not inducible by RA in a variant NB-4 cell line, NB-4.007/6, which is resistant to the effects of RA, suggesting a role for this pathway in the induction of RA responses. Our data also demonstrate that the small G-protein Rac1 is activated by RA and functions as an upstream regulator of p38 activation, whereas the MAPKAPK-2 serine kinase is a downstream effector for the RA-activated p38. To obtain information on the functional role of the Rac1/p38/MAPKAPK-2 pathway in RA signaling, the effects of pharmacological inhibition of p38 on RA-induced gene transcription and cell differentiation were determined. Our results indicate that treatment of cells with the SB203580 inhibitor does not inhibit RA-dependent gene transcription via retinoic acid response elements or induction of Stat1 protein expression. However, treatment with SB203580 or SB202190 strongly enhances RA-dependent induction of cell differentiation and RA-regulated growth inhibitory responses. Altogether, our findings demonstrate that the Rac1/p38 MAP kinase pathway is activated in a RA-dependent manner and exhibits negative regulatory effects on the induction of differentiation.

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Crossref · 10.1074/jbc.m007431200

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  • RA activates p38MAPK in fibroblasts, mouse embryo carcinoma cells, mammary breast tumor cells, and leukemia cells.

    “RA activates the p38 mitogen-activated protein kinase (p38MAPK) in fi broblasts, mouse embryo carcinoma cells, mammary breast tumor cells, and leukemia cells ( 96,111,114,115 ).”
  • RA-induced activation of the two MAPK pathways is subsequent to activation of upstream cascades involving Rho-GTPases, PI3K and/or PKB/Akt.

    “Nevertheless, the RA-induced activation of the two MAPK pathways is subsequent to the activation of upstream cascades involving Rho-GTPases ( 114, 115, 117 ), phosphoinositide 3-kinase (PI3K) and/or protein kinase B (PKB)/Akt ( 120, 121, 123 ), suggesting an atypical, nongenomic activation event similar to that described for steroid nuclear receptors ( 124, 125 ).”

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Authors
Alsayed, Y., Uddin, S., Mahmud, N., Lekmine, F., Kalvakolanu, D. V., Minucci, S., Bokoch, G., & Platanias, L. C.
Affiliations
  • Jesse Brown VA Medical Center (US)
  • University of Maryland, Baltimore (US)
  • European Institute of Oncology (IT)
  • Scripps Research Institute (US)
Corresponding author
Platanias, Leonidas C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-02
Volume
276
Issue
6
Pages
4012-4019
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2047204411
Cited by
161
References
73
Citations by year
2026: 1 · 2025: 4 · 2024: 3 · 2023: 6 · 2022: 1 · 2020: 3 · 2019: 6 · 2018: 5 · 2017: 3 · 2016: 4 · 2015: 7 · 2014: 6 · 2013: 12 · 2012: 4
FWCI
3.62
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • INFM-OAR (INFN Catania) (submittedVersion, cc-by)
Funders
  • U.S. Department of Veterans Affairs
  • National Institutes of Health (5r29ca073381-03, 5r01ca071401-06, CA77816)
  • National Cancer Institute (CA-77816, CA78282, R01CA078282, CA73381, CA-71401, R01CA077816)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
all-trans retinoic acid, Rac1, p38 MAPK, MAPKAPK2, retinoic acid signaling, leukemia cell differentiation, retinoic acid response element, STAT1, SB203580, SB202190, MCF-7 cells, cell differentiation, gene transcription, growth inhibition
MeSH terms
MAP-Kinase-Activated Kinase 2, Cell Differentiation, Enzyme Activation, Enzyme Inhibitors, Humans, Imidazoles, Pyridines, Tretinoin, Tumor Cells, Cultured, Protein Serine-Threonine Kinases, rac1 GTP-Binding Protein, Mitogen-Activated Protein Kinases, MAP Kinase Signaling System, Intracellular Signaling Peptides and Proteins, p38 Mitogen-Activated Protein Kinases

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