Amelioration of Cardiac Function and Activation of Anti-inflammatory Vasoactive Peptides Expression in the Rat Myocardium by Low Level Laser Therapy

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2014 Jul 4

PMID 24991808

Citations 20

Authors

Martha Trindade Manchini

Andrey Jorge Serra

Regiane Dos Santos Feliciano

Eduardo Tadeu Santana

Ednei Luis Antonio

Paulo de Tarso Camillo de Carvalho

Jairo Montemor

Renato Oliveira Crajoinas

Adriana Castello Costa Girardi

Paulo Jose Ferreira Tucci

Jose Antonio Silva Jr

Affiliations

Soon will be listed here.

Abstract

Low-level laser therapy (LLLT) has been used as an anti-inflammatory treatment in several disease conditions, even when inflammation is a secondary consequence, such as in myocardial infarction (MI). However, the mechanism by which LLLT is able to protect the remaining myocardium remains unclear. The present study tested the hypothesis that LLLT reduces inflammation after acute MI in female rats and ameliorates cardiac function. The potential participation of the Renin-Angiotensin System (RAS) and Kallikrein-Kinin System (KKS) vasoactive peptides was also evaluated. LLLT treatment effectively reduced MI size, attenuated the systolic dysfunction after MI, and decreased the myocardial mRNA expression of interleukin-1 beta and interleukin-6 in comparison to the non-irradiated rat tissue. In addition, LLLT treatment increased protein and mRNA levels of the Mas receptor, the mRNA expression of kinin B2 receptors and the circulating levels of plasma kallikrein compared to non-treated post-MI rats. On the other hand, the kinin B1 receptor mRNA expression decreased after LLLT. No significant changes were found in the expression of vascular endothelial growth factor (VEGF) in the myocardial remote area between laser-irradiated and non-irradiated post-MI rats. Capillaries density also remained similar between these two experimental groups. The mRNA expression of the inducible nitric oxide synthase (iNOS) was increased three days after MI, however, this effect was blunted by LLLT. Moreover, endothelial NOS mRNA content increased after LLLT. Plasma nitric oxide metabolites (NOx) concentration was increased three days after MI in non-treated rats and increased even further by LLLT treatment. Our data suggest that LLLT diminishes the acute inflammation in the myocardium, reduces infarct size and attenuates left ventricle dysfunction post-MI and increases vasoactive peptides expression and nitric oxide (NO) generation.

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