Direkt zum Inhalt
Merck

Stress-Induced Accumulation of HnRNP K into Stress Granules.

Journal of cancer science and clinical therapeutics (2021-01-01)
Jayoung Kim, Austin Yeon, Woong-Ki Kim, Khae-Hawn Kim, Takbum Ohn
ZUSAMMENFASSUNG

Stress granules (SGs) are cytoplasmic aggregates to reprogram gene expression in response to cellular stimulus. Here, we show that while SGs are being assembled in response to clotrimazole, an antifungal medication heterogeneous nuclear ribonucleoprotein (hnRNP) K, an RNA-binding protein that mediates translational silencing of mRNAs, is rapidly accumulated in SGs in U-2OS osteosarcoma cells. Forced expression of hnRNP K induces resistance to clotrimazole-induced apoptosis. Erk/MAPK is transiently activated in response to clotrimazole, and pharmacological suppression of the Erk/MAPK pathway sensitizes the cells to apoptosis. Inhibition of the Erk/MAPK pathway promotes the assembly of SGs. These results suggest that dynamic cytoplasmic formation of SGs and hnRNP K relocation to SGs may be defensive mechanisms against clotrimazole-induced apoptosis in U-2OS osteosarcoma cells.

MATERIALIEN
Produktnummer
Marke
Produktbeschreibung

Sigma-Aldrich
PD 98059, PD 98059, CAS 167869-21-8, is a cell-permeable, selective & reversible inhibitor of MAP Kinase Kinase (MEK). Inhibits MAP Kinase activation and subsequent phosphorylation of MAP Kinase substrates.
Sigma-Aldrich
SB 203580, SB 203580, CAS 152121-47-6, is a highly specific, potent, cell-permeable, selective, reversible, and ATP-competitive inhibitor of p38 MAP kinase (IC₅₀ = 34 nM in vitro, 600 nM in cells).