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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Telomerase enzyme deficiency promotes metabolic dysfunction in murine hepatocytes upon dietary stress

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Author(s):
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Alves-Paiva, Raquel M. [1, 2, 3] ; Kajigaya, Sachiko [3] ; Feng, Xingmin [3] ; Chen, Jichun [3] ; Desierto, Marie [3] ; Wong, Susan [3] ; Townsley, Danielle M. [3] ; Donaires, Flavia S. [1] ; Bertola, Adeline [4] ; Gao, Bin [4] ; Young, Neal S. [3] ; Calado, Rodrigo T. [1, 2]
Total Authors: 12
Affiliation:
[1] Sao Paulo Res Fdn FAPESP, Ctr Cell Based Therapy, Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Ribeirao Preto Sch Med, Dept Internal Med, Ribeirao Preto, SP - Brazil
[3] NIAAA, Hematol Branch, NHLBI, NIH, Bethesda, MD - USA
[4] NIAAA, Lab Liver Dis, NIH, Bethesda, MD - USA
Total Affiliations: 4
Document type: Journal article
Source: LIVER INTERNATIONAL; v. 38, n. 1, p. 144-154, JAN 2018.
Web of Science Citations: 2
Abstract

Background \& AimsShort telomeres and genetic telomerase defects are risk factors for some human liver diseases, ranging from non-alcoholic fatty liver disease and non-alcoholic steatohepatitis to cirrhosis. In murine models, telomere dysfunction has been shown to metabolically compromise hematopoietic cells, liver and heart via the activation of the p53-PGC axis. MethodsTert- and Terc-deficient mice were challenged with liquid high-fat diet. Liver metabolic contents were analysed by CE-TOFMS and liver fat content was confirmed by confocal and electronic microscopy. ResultsTert-deficient but not Terc-deficient mice develop hepatocyte injury and frank steatosis when challenged with liquid high-fat diet. Upon high-fat diet, Tert(-/-) hepatocytes fail to engage the citric acid cycle (TCA), with an imbalance of NADPH/NADP(+) and NADH/NAD(+) ratios and depletion of intermediates of TCA cycle, such as cis-aconitic acid. Telomerase deficiency caused an intrinsic metabolic defect unresponsive to environmental challenge. Chemical inhibition of telomerase by zidovudine recapitulated the abnormal Tert(-/-) metabolic phenotype in Terc(-/-) hepatocytes. ConclusionsOur findings indicate that in telomeropathies short telomeres are not the only molecular trigger and telomerase enzyme deficiency provokes hepatocyte metabolic dysfunction, abrogates response to environmental challenge, and causes cellular injury and steatosis, providing a mechanism for liver damage in telomere diseases. See Editorial on Page 33 (AU)

FAPESP's process: 12/00449-5 - Mechanisms of development of liver cirrhosis by CCl4 and schistosomiasis in Tert-/- knockout transgenic mice
Grantee:Raquel de Melo Alves Paiva
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 11/18313-0 - Mechanisms of development of liver cirrhosis by CCl4 and schistosomiasis in Tert-/- knockout and DKC1m hypomorphic transgenic mice
Grantee:Raquel de Melo Alves Paiva
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/08135-2 - CTC - Center for Cell-Based Therapy
Grantee:Dimas Tadeu Covas
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC