Expression of senescence-associated microRNAs and target genes in cellular aging and modulation by tocotrienol-rich fraction. 2014

Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
Department of Biochemistry, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.

Emerging evidences highlight the implication of microRNAs as a posttranscriptional regulator in aging. Several senescence-associated microRNAs (SA-miRNAs) are found to be differentially expressed during cellular senescence. However, the role of dietary compounds on SA-miRNAs remains elusive. This study aimed to elucidate the modulatory role of tocotrienol-rich fraction (TRF) on SA-miRNAs (miR-20a, miR-24, miR-34a, miR-106a, and miR-449a) and established target genes of miR-34a (CCND1, CDK4, and SIRT1) during replicative senescence of human diploid fibroblasts (HDFs). Primary cultures of HDFs at young and senescent were incubated with TRF at 0.5 mg/mL. Taqman microRNA assay showed significant upregulation of miR-24 and miR-34a and downregulation of miR-20a and miR-449a in senescent HDFs (P < 0.05). TRF reduced miR-34a expression in senescent HDFs and increased miR-20a expression in young HDFs and increased miR-449a expression in both young and senescent HDFs. Our results also demonstrated that ectopic expression of miR-34a reduced the expression of CDK4 significantly (P < 0.05). TRF inhibited miR-34a expression thus relieved its inhibition on CDK4 gene expression. No significant change was observed on the expression of CCND1, SIRT1, and miR-34a upstream transcriptional regulator, TP53. In conclusion tocotrienol-rich fraction prevented cellular senescence of human diploid fibroblasts via modulation of SA-miRNAs and target genes expression.

UI MeSH Term Description Entries
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D005347 Fibroblasts Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules. Fibroblast
D005786 Gene Expression Regulation Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation. Gene Action Regulation,Regulation of Gene Expression,Expression Regulation, Gene,Regulation, Gene Action,Regulation, Gene Expression
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000975 Antioxidants Naturally occurring or synthetic substances that inhibit or retard oxidation reactions. They counteract the damaging effects of oxidation in animal tissues. Anti-Oxidant,Antioxidant,Antioxidant Activity,Endogenous Antioxidant,Endogenous Antioxidants,Anti-Oxidant Effect,Anti-Oxidant Effects,Anti-Oxidants,Antioxidant Effect,Antioxidant Effects,Activity, Antioxidant,Anti Oxidant,Anti Oxidant Effect,Anti Oxidant Effects,Anti Oxidants,Antioxidant, Endogenous,Antioxidants, Endogenous
D016159 Tumor Suppressor Protein p53 Nuclear phosphoprotein encoded by the p53 gene (GENES, P53) whose normal function is to control CELL PROLIFERATION and APOPTOSIS. A mutant or absent p53 protein has been found in LEUKEMIA; OSTEOSARCOMA; LUNG CANCER; and COLORECTAL CANCER. p53 Tumor Suppressor Protein,Cellular Tumor Antigen p53,Oncoprotein p53,TP53 Protein,TRP53 Protein,p53 Antigen,pp53 Phosphoprotein,Phosphoprotein, pp53
D016922 Cellular Senescence Process by which cells irreversibly stop dividing and enter a state of permanent growth arrest without undergoing CELL DEATH. Senescence can be induced by DNA DAMAGE or other cellular stresses, such as OXIDATIVE STRESS. Aging, Cell,Cell Aging,Cell Senescence,Replicative Senescence,Senescence, Cellular,Senescence, Replicative,Cell Ageing,Cellular Ageing,Cellular Aging,Ageing, Cell,Ageing, Cellular,Aging, Cellular,Senescence, Cell
D051358 Cyclin-Dependent Kinase 4 Cyclin-dependent kinase 4 is a key regulator of G1 PHASE of the CELL CYCLE. It partners with CYCLIN D to phosphorylate RETINOBLASTOMA PROTEIN. CDK4 activity is inhibited by CYCLIN-DEPENDENT KINASE INHIBITOR P16. Cdk4 Protein Kinase,Cdk4 Cyclin-Dependent Kinase,Cdk4 Protein,Cell Division Protein Kinase 4,Cyclin D-Dependent Kinase CDK4,PSK-J3 Kinase,p34PSK-J3 Kinase,Cdk4 Cyclin Dependent Kinase,Cyclin D Dependent Kinase CDK4,Cyclin Dependent Kinase 4,Cyclin-Dependent Kinase, Cdk4,PSK J3 Kinase,Protein Kinase, Cdk4,p34PSK J3 Kinase
D056564 Sirtuin 1 A sirtuin family member found primarily in the CELL NUCLEUS. It is an NAD-dependent deacetylase with specificity towards HISTONES and a variety of proteins involved in gene regulation. Silent Mating Type Information Regulation 2 Homolog 1,Sirt1
D019938 Cyclin D1 Protein encoded by the bcl-1 gene which plays a critical role in regulating the cell cycle. Overexpression of cyclin D1 is the result of bcl-1 rearrangement, a t(11;14) translocation, and is implicated in various neoplasms. CCND1 Protein,PRAD1 Protein,Proto-Oncogene Proteins c-bcl-1,bcl-1 Proto-Oncogene Proteins,c-bcl-1 Proteins,Proto-Oncogene Products bcl-1,Proto-Oncogene Protein bcl-1,bcl-1 Proto-Oncogene Products,bcl1 Proto-Oncogene Proteins,Proto Oncogene Products bcl 1,Proto Oncogene Protein bcl 1,Proto Oncogene Proteins c bcl 1,Proto-Oncogene Products, bcl-1,Proto-Oncogene Proteins, bcl-1,Proto-Oncogene Proteins, bcl1,bcl 1 Proto Oncogene Products,bcl 1 Proto Oncogene Proteins,bcl-1, Proto-Oncogene Protein,bcl1 Proto Oncogene Proteins,c bcl 1 Proteins,c-bcl-1, Proto-Oncogene Proteins

Related Publications

Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2012, Clinics (Sao Paulo, Brazil),
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2015, La Clinica terapeutica,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2013, Oxidative medicine and cellular longevity,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
October 2011, Archives of medical science : AMS,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2017, Progress in molecular biology and translational science,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2017, Oxidative medicine and cellular longevity,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
September 2013, Ageing research reviews,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2021, Archives of medical science : AMS,
Sharon Gwee Sian Khee, and Yasmin Anum Mohd Yusof, and Suzana Makpol
January 2017, Oxidative medicine and cellular longevity,
Copied contents to your clipboard!