Acute Myocardial Response to Stretch: What We (don't) Know

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Neves, JS (Autor) FMUP; Leite Moreira, AM (Autor) FMUP; Neiva Sousa, M (Autor) Outra; Almeida Coelho, J (Autor) Outra; Castro Ferreira, R (Autor) Outra; Leite-Moreira AF (Autor) FMUP

Revista

Título: Frontiers in Physiology

Vol. 6

ISSN: 1664-042X

Editora: Frontiers Media

Indexação

ISI Web of Knowledge - 30 Citações

Scopus - 34 Citações

Outras Informações

ID Authenticus: P-00J-ZJ1

DOI: 10.3389/fphys.2015.00408

Abstract (EN): Myocardial stretch, as result of acute hemodynamic overload, is one of the most frequent challenges to the heart and the ability of the heart to intrinsically adapt to it is essential to prevent circulatory congestion. In this review, we highlight the historical background, the currently known mechanisms, as well as the gaps in the understanding of this physiological response. The systolic adaptation to stretch is well-known for over 100 years, being dependent on an immediate increase in contractility known as the Frank-Starling mechanism and a further progressive increase the slow force response. On the other hand, its diastolic counterpart remains largely unstudied. Mechanosensors are structures capable of perceiving mechanical signals and activating pathways that allow their transduction into biochemical responses. Although the connection between these structures and stretch activated pathways remains elusive, we emphasize those most likely responsible for the initiation of the acute response. Calcium-dependent pathways, including angiotensin-and endothelin-related pathways: and cGMP-dependent pathways, comprising the effects of nitric oxide and cardiac natriuretic hormones, embody downstream signaling. The ischemic setting, a paradigmatic situation of acute hemodynamic overload, is also touched upon. Despite the relevant knowledge accumulated, there is much that we still do not know. The quest for further understanding the myocardial response to acute stretch may provide new insights, not only in its physiological importance, but also in the prevention and treatment of cardiovascular diseases.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11