Cargando…
eIF2A‐knockout mice reveal decreased life span and metabolic syndrome
Eukaryotic initiation factor 2A (eIF2A) is a 65 kDa protein that functions in minor initiation pathways, which affect the translation of only a subset of messenger ribonucleic acid (mRNAs), such as internal ribosome entry site (IRES)‐containing mRNAs and/or mRNAs harboring upstream near cognate/non‐...
Autores principales: | , , , , , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8848898/ https://www.ncbi.nlm.nih.gov/pubmed/34665898 http://dx.doi.org/10.1096/fj.202101105R |
_version_ | 1784652348278177792 |
---|---|
author | Anderson, Richard Agarwal, Anchal Ghosh, Arnab Guan, Bo‐Jhih Casteel, Jackson Dvorina, Nina Baldwin, William M. Mazumder, Barsanjit Nazarko, Taras Y. Merrick, William C. Buchner, David A. Hatzoglou, Maria Kondratov, Roman V. Komar, Anton A. |
author_facet | Anderson, Richard Agarwal, Anchal Ghosh, Arnab Guan, Bo‐Jhih Casteel, Jackson Dvorina, Nina Baldwin, William M. Mazumder, Barsanjit Nazarko, Taras Y. Merrick, William C. Buchner, David A. Hatzoglou, Maria Kondratov, Roman V. Komar, Anton A. |
author_sort | Anderson, Richard |
collection | PubMed |
description | Eukaryotic initiation factor 2A (eIF2A) is a 65 kDa protein that functions in minor initiation pathways, which affect the translation of only a subset of messenger ribonucleic acid (mRNAs), such as internal ribosome entry site (IRES)‐containing mRNAs and/or mRNAs harboring upstream near cognate/non‐AUG start codons. These non‐canonical initiation events are important for regulation of protein synthesis during cellular development and/or the integrated stress response. Selective eIF2A knockdown in cellular systems significantly inhibits translation of such mRNAs, which rely on alternative initiation mechanisms for their translation. However, there exists a gap in our understanding of how eIF2A functions in mammalian systems in vivo (on the organismal level) and ex vivo (in cells). Here, using an eIF2A‐knockout (KO) mouse model, we present evidence implicating eIF2A in the biology of aging, metabolic syndrome and central tolerance. We discovered that eIF2A‐KO mice have reduced life span and that eIF2A plays an important role in maintenance of lipid homeostasis, the control of glucose tolerance, insulin resistance and also reduces the abundance of B lymphocytes and dendritic cells in the thymic medulla of mice. We also show the eIF2A KO affects male and female mice differently, suggesting that eIF2A may affect sex‐specific pathways. Interestingly, our experiments involving pharmacological induction of endoplasmic reticulum (ER) stress with tunicamycin did not reveal any substantial difference between the response to ER stress in eIF2A‐KO and wild‐type mice. The identification of eIF2A function in the development of metabolic syndrome bears promise for the further identification of specific eIF2A targets responsible for these changes. |
format | Online Article Text |
id | pubmed-8848898 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-88488982022-02-16 eIF2A‐knockout mice reveal decreased life span and metabolic syndrome Anderson, Richard Agarwal, Anchal Ghosh, Arnab Guan, Bo‐Jhih Casteel, Jackson Dvorina, Nina Baldwin, William M. Mazumder, Barsanjit Nazarko, Taras Y. Merrick, William C. Buchner, David A. Hatzoglou, Maria Kondratov, Roman V. Komar, Anton A. FASEB J Research Articles Eukaryotic initiation factor 2A (eIF2A) is a 65 kDa protein that functions in minor initiation pathways, which affect the translation of only a subset of messenger ribonucleic acid (mRNAs), such as internal ribosome entry site (IRES)‐containing mRNAs and/or mRNAs harboring upstream near cognate/non‐AUG start codons. These non‐canonical initiation events are important for regulation of protein synthesis during cellular development and/or the integrated stress response. Selective eIF2A knockdown in cellular systems significantly inhibits translation of such mRNAs, which rely on alternative initiation mechanisms for their translation. However, there exists a gap in our understanding of how eIF2A functions in mammalian systems in vivo (on the organismal level) and ex vivo (in cells). Here, using an eIF2A‐knockout (KO) mouse model, we present evidence implicating eIF2A in the biology of aging, metabolic syndrome and central tolerance. We discovered that eIF2A‐KO mice have reduced life span and that eIF2A plays an important role in maintenance of lipid homeostasis, the control of glucose tolerance, insulin resistance and also reduces the abundance of B lymphocytes and dendritic cells in the thymic medulla of mice. We also show the eIF2A KO affects male and female mice differently, suggesting that eIF2A may affect sex‐specific pathways. Interestingly, our experiments involving pharmacological induction of endoplasmic reticulum (ER) stress with tunicamycin did not reveal any substantial difference between the response to ER stress in eIF2A‐KO and wild‐type mice. The identification of eIF2A function in the development of metabolic syndrome bears promise for the further identification of specific eIF2A targets responsible for these changes. John Wiley and Sons Inc. 2021-10-19 2021-11 /pmc/articles/PMC8848898/ /pubmed/34665898 http://dx.doi.org/10.1096/fj.202101105R Text en © 2021 The Authors. The FASEB Journal published by Wiley Periodicals LLC on behalf of Federation of American Societies for Experimental Biology https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
spellingShingle | Research Articles Anderson, Richard Agarwal, Anchal Ghosh, Arnab Guan, Bo‐Jhih Casteel, Jackson Dvorina, Nina Baldwin, William M. Mazumder, Barsanjit Nazarko, Taras Y. Merrick, William C. Buchner, David A. Hatzoglou, Maria Kondratov, Roman V. Komar, Anton A. eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title | eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title_full | eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title_fullStr | eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title_full_unstemmed | eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title_short | eIF2A‐knockout mice reveal decreased life span and metabolic syndrome |
title_sort | eif2a‐knockout mice reveal decreased life span and metabolic syndrome |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8848898/ https://www.ncbi.nlm.nih.gov/pubmed/34665898 http://dx.doi.org/10.1096/fj.202101105R |
work_keys_str_mv | AT andersonrichard eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT agarwalanchal eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT ghosharnab eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT guanbojhih eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT casteeljackson eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT dvorinanina eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT baldwinwilliamm eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT mazumderbarsanjit eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT nazarkotarasy eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT merrickwilliamc eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT buchnerdavida eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT hatzogloumaria eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT kondratovromanv eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome AT komarantona eif2aknockoutmicerevealdecreasedlifespanandmetabolicsyndrome |