Université de Fribourg

Multiple cryoinjuries modulate the efficiency of zebrafish heart regeneration

Bise, Thomas ; Sallin, Pauline ; Pfefferli, Catherine ; Jaźwińska, Anna

In: Scientific Reports, 2020, vol. 10, no. 1, p. 11551

Zebrafish can regenerate their damaged hearts throughout their lifespan. It is, however, unknown, whether regeneration remains effective when challenged with successive cycles of cardiac damage in the same animals. Here, we assessed ventricular restoration after two, three and six cryoinjuries interspaced by recovery periods. Using transgenic cell-lineage tracing analysis, we demonstrated...

Université de Fribourg

Preconditioning boosts regenerative programmes in the adult zebrafish heart

Preux Charles, Anne-Sophie de ; Bise, Thomas ; Baier, Felix ; Sallin, Pauline ; Jaźwińska, Anna

In: Open Biology, 2016, vol. 6, no. 7, p. 160101

During preconditioning, exposure to a non-lethal harmful stimulus triggers a body-wide increase of survival and pro-regenerative programmes that enable the organism to better withstand the deleterious effects of subsequent injuries. This phenomenon has first been described in the mammalian heart, where it leads to a reduction of infarct size and limits the dysfunction of the injured organ....

Université de Fribourg

Acute stress is detrimental to heart regeneration in zebrafish

Sallin, Pauline ; Jaźwińska, Anna

In: Open Biology, 2016, vol. 6, no. 3, p. 160012

Psychological stress is one of the factors associated with human cardiovascular disease. Here, we demonstrate that acute perceived stress impairs the natural capacity of heart regeneration in zebrafish. Beside physical and chemical disturbances, intermittent crowding triggered an increase in cortisol secretion and blocked the replacement of fibrotic tissue with new myocardium. Pharmacological...

Université de Fribourg

Regeneration versus scarring in vertebrate appendages and heart

Jaźwińska, Anna ; Sallin, Pauline

In: The Journal of Pathology, 2015, p. -

Injuries to complex human organs, such as the limbs and the heart, result in pathological conditions, for which we often lack adequate treatments. While modern regenerative approaches are based on the transplantation of stem cell-derived cells, natural regeneration in lower vertebrates, such as zebrafish and newts, relies predominantly on the intrinsic plasticity of mature tissues. This property...

Université de Fribourg

A dual epimorphic and compensatory mode of heart regeneration in zebrafish

Sallin, Pauline ; Preux Charles, Anne-Sophie de ; Duruz, Vincent ; Pfefferli, Catherine ; Jaźwińska, Anna

In: Developmental Biology, 2015, vol. 399, no. 1, p. 27–40

Zebrafish heart regeneration relies on the capacity of cardiomyocytes to proliferate upon injury. To understand the principles of this process after cryoinjury-induced myocardial infarction, we established a spatio-temporal map of mitotic cardiomyocytes and their differentiation dynamics. Immunodetection of phosphohistone H3 and embryonic ventricular heavy chain myosin highlighted two distinct...