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eIF4E-Overexpression imparts perillyl alcohol and rapamycin-mediated regulation of telomerase reverse transcriptase.

Experimental cell research
January 1, 1970
Tabetha Sundin et al. (3 authors)
Journal ArticleMolecular Study
Extracted Claims (31)
InterventionDirectionEndpointPopulationDosageImpactClaim #
perillyl alcohol (POH)
decrease
eIF4E-binding protein (4E-BP1)
Cancer cells
-
dephosphorylate
#1
perillyl alcohol (POH)
decrease
cap-dependent translation
Cancer cells
-
attenuate
#2
rapamycin
decrease
eIF4E-binding protein (4E-BP1)
Cancer cells
-
dephosphorylate
#3
rapamycin
decrease
cap-dependent translation
Cancer cells
-
attenuate
#4
perillyl alcohol (POH)
neutral
telomerase activity
cancer cell lines with elevated eIF4E
-
regulate
#5
rapamycin
neutral
telomerase activity
cancer cell lines with elevated eIF4E
-
regulate
#6
-
increase
eIF4E amounts
rb4E cells
5-fold
5-fold higher
#7
-
no change
telomerase activity
control and rb4E cells
-
nearly equivalent
#8
-
no change
telomerase reverse transcriptase (TERT) mRNA
control and rb4E cells
-
nearly equivalent
#9
-
no change
TERT protein
control and rb4E cells
-
nearly equivalent
#10
perillyl alcohol (POH)
no change
telomerase activity
control cells
-
unaffected
#11
perillyl alcohol (POH)
no change
TERT mRNA
control cells
-
unaffected
#12
perillyl alcohol (POH)
no change
TERT protein levels
control cells
-
unaffected
#13
rapamycin
no change
telomerase activity
control cells
-
unaffected
#14
rapamycin
no change
TERT mRNA
control cells
-
unaffected
#15
rapamycin
no change
TERT protein levels
control cells
-
unaffected
#16
perillyl alcohol (POH)
decrease
telomerase activity
rb4E cells
-
attenuated
#17
perillyl alcohol (POH)
decrease
TERT protein
rb4E cells
-
attenuated
#18
rapamycin
decrease
telomerase activity
rb4E cells
-
attenuated
#19
rapamycin
decrease
TERT protein
rb4E cells
-
attenuated
#20
perillyl alcohol (POH)
no change
TERT mRNA
rb4E cells
-
without corresponding decreases
#21
rapamycin
no change
TERT mRNA
rb4E cells
-
without corresponding decreases
#22
mTOR mediators
neutral
S6K
cells with increased eIF4E
-
modulated
#23
mTOR mediators
neutral
Akt
cells with increased eIF4E
-
modulated
#24
mTOR mediators
neutral
4E-BP1
cells with increased eIF4E
-
modulated
#25
perillyl alcohol (POH)
decrease
telomerase
rb4E cells
-
enables inhibitory effects
#26
perillyl alcohol (POH)
decrease
TERT protein
rb4E cells
-
enables inhibitory effects
#27
rapamycin
decrease
telomerase
rb4E cells
-
enables inhibitory effects
#28
rapamycin
decrease
TERT protein
rb4E cells
-
enables inhibitory effects
#29
eIF4E-overexpression
neutral
cellular protein synthetic processes
rb4E cells
-
modifies
#30
eIF4E-overexpression
neutral
gene regulation
rb4E cells
-
modifies
#31
Abstract

Translation is mediated partly by regulation of free eukaryotic initiation factor 4E (eIF4E) levels through PI3K-Akt-mTOR signaling. Cancer cells treated with the plant-derived perillyl alcohol (POH) or the mechanistic target of rapamycin (mTOR) inhibitor rapamycin dephosphorylate eIF4E-binding protein (4E-BP1) and attenuate cap-dependent translation. We previously showed in cancer cell lines with elevated eIF4E that POH and rapamycin regulate telomerase activity through this pathway. Here, immortalized Chinese hamster ovary (CHO) control cells and CHO cells with forced eIF4E expression (rb4E) were used to elucidate eIF4E's role in telomerase regulation by POH and rapamycin. Despite 5-fold higher eIF4E amounts in rb4E, telomerase activity, telomerase reverse transcriptase (TERT) mRNA, and TERT protein were nearly equivalent in control and rb4E cells. In control cells, telomerase activity, TERT mRNA and protein levels were unaffected by either compound. In contrast, telomerase activity and TERT protein were both attenuated by either agent in rb4E cells, but without corresponding TERT mRNA decreases indicating a translational/post-translational process. S6K, Akt, and 4E-BP1 were modulated by mTOR mediators only in the presence of increased eIF4E. Thus, eIF4E-overexpression in rb4E cells enables inhibitory effects of POH and rapamycin on telomerase and TERT protein. Importantly, eIF4E-overexpression modifies cellular protein synthetic processes and gene regulation.

Medical Subject Headings (MeSH)
AnimalsAntineoplastic AgentsCHO CellsCricetinaeCricetulusEnzyme ActivationEukaryotic Initiation Factor-4EGene Expression Regulation, EnzymologicMonoterpenesOncogene Protein v-aktPhosphorylationRibosomal Protein S6 KinasesSirolimusTelomeraseTransfectionUp-Regulation
Study Links
PubMed ID23747720
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