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Epigenetic mechanisms of peptidergic regulation of gene expression during aging of human cells

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Abstract

Expression levels of genes encoding specific transcription factors and other functionally important proteins vary upon aging of pancreatic and bronchial epithelium cell cultures. The peptides KEDW and AEDL tissue-specifically affect gene expression in pancreatic and bronchial cell cultures, respectively. It is established in this work that the DNA methylation patterns of the PDX1, PAX6, NGN3, NKX2-1, and SCGB1A1 gene promoter regions change upon aging in pancreatic and bronchial cell cultures in correlation with variations in their expression levels. Thus, stable changes in gene expression upon aging of cell cultures could be caused by changes in their promoter methylation patterns. The methylation patterns of the PAX4 gene in pancreatic cells as well as those of the FOXA1, SCGB3A2, and SFTPA1 genes in bronchial cells do not change upon aging and are unaffected by peptides, whereas their expression levels change in both cases. The promoter region of the FOXA2 gene in pancreatic cells contains a small number of methylated CpG sites, their methylation levels being affected by cell culture aging and KEDW, though without any correlation with gene expression levels. The promoter region of the FOXA2 gene is completely unmethylated in bronchial cells irrespective of cell culture age and AEDL action. Changes in promoter methylation might be the cause of age- and peptide-induced variations in expression levels of the PDX1, PAX6, and NGN3 genes in pancreatic cells and NKX2-1 and SCGB1A1 genes in bronchial cells. Expression levels of the PAX4 and FOXA2 genes in pancreatic cells and FOXA1, FOXA2, SCGB3A2, and SFTPA1 genes in bronchial cells seem to be controlled by some other mechanisms.

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Abbreviations

AEDL:

peptide H-Ala-Glu-Asp-Leu-OH

bp:

base pair

CGI:

CpG-island

KEDW:

peptide H-Lys-Glu-Asp-Trp-NH2

TIS:

transcription initiation site

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Authors and Affiliations

  1. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992, Moscow, Russia

    V. V. Ashapkin & B. F. Vanyushin

  2. St. Petersburg Institute of Bioregulation and Gerontology, 197110, St. Petersburg, Russia

    N. S. Linkova & V. Kh. Khavinson

  3. St. Petersburg State Polytechnical University, 195251, St. Petersburg, Russia

    N. S. Linkova

  4. Mechnikov North-West State Medical University, 191015, St. Petersburg, Russia

    V. Kh. Khavinson

Authors
  1. V. V. Ashapkin
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  2. N. S. Linkova
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  3. V. Kh. Khavinson
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  4. B. F. Vanyushin
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Correspondence to V. V. Ashapkin.

Additional information

Published in Russian in Biokhimiya, 2015, Vol. 80, No. 3, pp. 374–388.

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Ashapkin, V.V., Linkova, N.S., Khavinson, V.K. et al. Epigenetic mechanisms of peptidergic regulation of gene expression during aging of human cells. Biochemistry Moscow 80, 310–322 (2015). https://doi.org/10.1134/S0006297915030062

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  • DOI: https://doi.org/10.1134/S0006297915030062

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