Telomerase Is Essential for Zebrafish Heart Regeneration.

Bednarek, Dorota; González-Rosa, Juan Manuel; Guzmán-Martínez, Gabriela; Gutiérrez-Gutiérrez, Óscar; Aguado, Tania; Sánchez-Ferrer, Carlota; dos Santos Marques, Ines Joao; Galardi-Castilla, María; de Diego, Irene; Gómez, Manuel José; Cortés, Alfonso; Zapata, Agustín; Jiménez-Borreguero, Luis Jesús; Mercader Huber, Nadia; Flores, Ignacio (2015). Telomerase Is Essential for Zebrafish Heart Regeneration. Cell reports, 12(10), pp. 1691-1703. Cell Press 10.1016/j.celrep.2015.07.064

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After myocardial infarction in humans, lost cardiomyocytes are replaced by an irreversible fibrotic scar. In contrast, zebrafish hearts efficiently regenerate after injury. Complete regeneration of the zebrafish heart is driven by the strong proliferation response of its cardiomyocytes to injury. Here we show that, after cardiac injury in zebrafish, telomerase becomes hyperactivated, and telomeres elongate transiently, preceding a peak of cardiomyocyte proliferation and full organ recovery. Using a telomerase-mutant zebrafish model, we found that telomerase loss drastically decreases cardiomyocyte proliferation and fibrotic tissue regression after cryoinjury and that cardiac function does not recover. The impaired cardiomyocyte proliferation response is accompanied by the absence of cardiomyocytes with long telomeres and an increased proportion of cardiomyocytes showing DNA damage and senescence characteristics. These findings demonstrate the importance of telomerase function in heart regeneration and highlight the potential of telomerase therapy as a means of stimulating cell proliferation upon myocardial infarction.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy

UniBE Contributor:

dos Santos Marques, Ines Joao and Mercader Huber, Nadia

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

2211-1247

Publisher:

Cell Press

Language:

English

Submitter:

Nadia Isabel Mercader Huber

Date Deposited:

28 Apr 2016 08:19

Last Modified:

28 Apr 2016 08:19

Publisher DOI:

10.1016/j.celrep.2015.07.064

PubMed ID:

26321646

BORIS DOI:

10.7892/boris.79612

URI:

https://boris.unibe.ch/id/eprint/79612

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