6533b7d3fe1ef96bd12615cf

RESEARCH PRODUCT

Docosahexaenoic acid inhibits cancer cell growth via p27Kip1, CDK2, ERK1/ERK2, and retinoblastoma phosphorylation

Virginie AiresKazuei IgarashiNaim Akhtar KhanTomoko YamashitaKeiko KashiwagiDavid Oaxaca-castilloKazuhiro Nishimura

subject

MAPK/ERK pathwayDocosahexaenoic AcidsMammary Neoplasms AnimalQD415-436fatty acidsenvironment and public healthBiochemistryMiceEndocrinologyCyclin-dependent kinaseCyclin EAnimalsRNA MessengerPhosphorylationCells CulturedCell ProliferationMAPK14biologyKinaseCyclin-dependent kinase 4Cyclin-Dependent Kinase 2Cyclin-dependent kinase 2Retinoblastomafood and beveragesCell BiologyUp-RegulationCell biologyenzymes and coenzymes (carbohydrates)cyclin-dependent kinaseCyclin-dependent kinase complexbiology.proteinPhosphorylationcell cyclelipids (amino acids peptides and proteins)Mitogen-Activated Protein KinasesCyclin-Dependent Kinase Inhibitor p27

description

Docosahexaenoic acid (DHA), a PUFA of the n-3 family, inhibited the growth of FM3A mouse mammary cancer cells by arresting their progression from the late-G(1) to the S phase of the cell cycle. DHA upregulated p27(Kip1) levels by inhibiting phosphorylation of mitogen-activated protein (MAP) kinases, i.e., ERK1/ERK2. Indeed, inhibition of ERK1/ERK2 phosphorylation by DHA, U0126 [chemical MAPK extracellularly signal-regulated kinase kinase (MEK) inhibitor], and MEK(SA) (cells expressing dominant negative constructs of MEK) resulted in the accumulation of p27(Kip1). MAP kinase (MAPK) inhibition by DHA did not increase p27(Kip1) mRNA levels. Rather, this fatty acid stabilized p27(Kip1) contents and inhibited MAPK-dependent proteasomal degradation of this protein. DHA also diminished cyclin E phosphorylation, cyclin-dependent kinase-2 (CDK2) activity, and phosphorylation of retinoblastoma protein in these cells. Our study shows that DHA arrests cell growth by modulating the phosphorylation of cell cycle-related proteins.

yearjournalcountryeditionlanguage
2006-10-01Journal of Lipid Research
https://doi.org/10.1194/jlr.m600269-jlr200