Please use this identifier to cite or link to this item:
Author(s): Henriques-Coelho, T
Correia-Pinto, J
Roncon-Albuquerque R, Jr.
Baptista, MJ
Lourenço, AP
Oliveira, SM
Brandão-Nogueira, A
Teles, A
Fortunato, JM
Leite-Moreira, AF
Title: Endogenous production of ghrelin and beneficial effects of its exogenous administration in monocrotaline-induced pulmonary hypertension
Issue Date: 2004
Abstract: We investigated the endogenous production of ghrelin as well as cardiac and pulmonary vascular effects of its administration in a rat model of monocrotaline (MCT)-induced pulmonary hypertension (PH). Adult Wistar rats randomly received a subcutaneous injection of MCT (60 mg/kg) or an equal volume of vehicle. One week later, animals were randomly assigned to receive a subcutaneous injection of ghrelin (100 mug/kg bid for 2 wk) or saline. Four groups were analyzed: normal rats treated with ghrelin (n=7), normal rats injected with saline (n=7), MCT rats treated with ghrelin (n=9), and MCT rats injected with saline (n=9). At 22-25 days, right (RV) and left ventricular (LV) pressures were measured, heart and lungs were weighted, and samples were collected for histological and molecular analysis. Endogenous production of ghrelin was almost abolished in normal rats treated with ghrelin. In MCT-treated animals, pulmonary expression of ghrelin was preserved, and RV myocardial expression was increased more than 20 times. In these animals, exogenous administration of ghrelin attenuated PH, RV hypertrophy, wall thickening of peripheral pulmonary arteries, and RV diastolic disturbances and ameliorated LV dysfunction, without affecting its endogenous production. In conclusion, decreased tissular expression of ghrelin in healthy animals but not in PH animals suggests a negative feedback in the former that is lost in the latter. A selective increase of ghrelin mRNA levels in the RV of animals with PH might indicate distinct regulation of its cardiac expression. Finally, ghrelin administration attenuated MCT-induced PH, pulmonary vascular remodeling, and RV hypertrophy, indicating that it may modulate PH.
Subject: Ciências médicas e da saúde
Medical and Health sciences
Scientific areas: Ciências médicas e da saúde
Medical and Health sciences
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:FMUP - Artigo em Revista Científica Internacional

Files in This Item:
File Description SizeFormat 
81646.pdf112.92 kBAdobe PDFThumbnail

This item is licensed under a Creative Commons License Creative Commons