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Role of RIN1 on telomerase activity driven by EGF-Ras mediated signaling in breast cancer.

Exp Cell Res. 2020 Nov 15;396(2):112318. Epub 2020 Oct 16
W Zhang 1 , M L Veisaga 2 , M A Barbieri 3
W Zhang 1 , M L Veisaga 2 , M A Barbieri 3

[No authors listed]

Author information
  • 1 Biochemistry PhD Program, Florida International University, 11220 SW 8th Street, Miami, FL, 33199, USA.
  • 2 Biomolecular Sciences Institute, Florida International University, 11220 SW 8th Street, Miami, FL, 33199, USA.
  • 3 Department of Biological Sciences, Florida International University, 11220 SW 8th Street, Miami, FL, 33199, USA; Biomolecular Sciences Institute, Florida International University, 11220 SW 8th Street, Miami, FL, 33199, USA; Fairchild Tropical Botanic Garden, 10901 Old Cutler Road, Coral Gables, FL, 33156, USA; International Center of Tropical Botany, Florida International University, 11220 SW 8th Street, Miami, FL, 33199, USA. Electronic address: barbieri@fiu.edu.

摘要

Epidermal growth factor (EGF)-receptor regulates several downstream signaling pathways upon EGF stimulation that involves cell proliferation, migration and invasion. Internalized EGF-receptor is either recycled or degraded, which fate is regulated in part by Ras interference 1 (RIN1). In this study, we tested the hypothesis that RIN1, a Ras effector protein and Rab5 guanine nucleotide exchange factor, controls several signaling molecules leading to the modulation of the telomerase activity; thus, allowing proper cell proliferation. We report that expression of RIN1 completely blocked proliferation of MCF-12 A and MCF-7 cells, while partially inhibited proliferation of MDA-MB-231 cells upon EGF stimulation. Furthermore, expression of the C-terminal region of RIN1 selectively plays a critical role in the inhibition of the proliferation of MDA-MB-231 cells. However, this inhibitory effect was specifically affected by the independent expression of RIN1:Vsp9 and RIN1:RA domains. Additionally, endogenous level of expression of RIN1 was decreased in metastatic MDA-MB-231 cells as compared with non-tumorigenic MCF-12 A cells. We observed that expression of RIN1:R94A mutant blocked the proliferation of MDA-MB-231 cells, while expression of RIN1:Y561F and RIN1:R629A mutants completely reversed the inhibitory effect of RIN1:WT. Consistent with our observations, we found that expression of RIN1:WT in MDA-MB-231 cells diminished both protein kinase B (AKT) and extracellular-signal-regulated kinase 1/2 (ERK1/2) activities while p38 mitogen-activated protein kinases (p38 MAPK) and stress-activated protein kinase (SAPK)/c-Jun N-terminal kinase (JNK) were unaffected, but it produced downregulation of cellular-myelocytomatosis (c-Myc), erythroblast transformation specific (Ets2) and signal transducer and activator of transcription 3 (Stat3) activities. Inversely, expression of high-mobility group box 1 (HMBG1) was inhibited whereas expression of forkhead box transcription factor 1 (FOXO1) was increased in cells expressing RIN1. Interestingly, expression of RIN1 blocked telomerase activity and human telomerase reverse transcriptase (hTERT) expression, which correlated with the downregulations of c-Myc, Ets-2 and Stat3 activation. Taken together these findings indicate that RIN1 is a critical player in the modulation of the telomerase activity as well as hTERT expression in MDA-MB-231 cells upon EGF stimulation.

KEYWORDS: Breast cancer cell, EGF, RIN1, Signaling, hTert

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