title: Effect of prior exercise training and myocardial infarction-induced heart failure on the neuronal and glial densities and the GFAP-immunoreactivity in the posterodorsal medial amygdala of rats.
abstract: Exercise training has neuroprotective effects whereas myocardial infarction (MI) and heart failure (HF) can cause neuronal death and reactive gliosis in the whole amygdala. The posterodorsal medial amygdala (MePD) is involved with cardiovascular reflexes and the central control of sympathetic/parasympathetic responses. Our aim was to study the effects of prior exercise training and of MI-induced HF on the neuronal and glial densities and the glial fibrillary acidic protein-immunoreactivity (GFAP-ir) in the MePD of adult male rats. Animals (n= 5/group) were: control, sedentary submitted to a sham MI (Sed Sham), sedentary submitted to MI/HF (Sed HF), trained on a treadmill and submitted to a sham MI (T Sham) or trained on a treadmill and submitted to MI/HF (T HF). The number of neurons and glial cells in the MePD was estimated using the optical fractionator and the GFAP-ir was quantified by optical densitometry. In the respective groups, treadmill training improved physical performance and MI damaged near 40% of the left ventricle. There was a hemispheric lateralization effect on the density of neurons (higher in the right MePD), but no significant difference in either the neuronal or the glial densities due to experimental condition. Regional GFAP-ir results revealed that the Sed HF group had a higher expression in the left MePD compared to the control and the Sed Sham rats (p⟨0.01). The present data did not evidence the effects of training or MI/HF in the MePD cellular density, but indicate a possible local restructuring of astrocytic cytoskeleton after MI/HF in rats.
authors.affiliation: PPG-CR, Federal University of Health Sciences of Porto Alegre, Brazil.
authors.forename: Ana Paula S
authors.initials: AP
authors.lastname: Salazar
authors.affiliation: Laboratory of Physiology, Department of Basic Sciences, Federal University of Health Sciences of Porto Alegre, Brazil.
authors.forename: Edson
authors.initials: E
authors.lastname: Quagliotto
authors.affiliation: Laboratory of Physiology, Department of Basic Sciences, Federal University of Health Sciences of Porto Alegre, Brazil.
authors.forename: Jadson
authors.initials: J
authors.lastname: Alves
authors.affiliation: Laboratory of Physiology, Department of Basic Sciences, Federal University of Health Sciences of Porto Alegre, Brazil.
authors.forename: Fernando A
authors.initials: FA
authors.lastname: Oliveira
authors.affiliation: Laboratory of Cellular and Tissue Biology, Faculty of Biosciences, PUCRS, Porto Alegre, Brazil.
authors.forename: Lisiani
authors.initials: L
authors.lastname: Saur
authors.affiliation: Laboratory of Cellular and Tissue Biology, Faculty of Biosciences, PUCRS, Porto Alegre, Brazil.
authors.forename: Léder L
authors.initials: LL
authors.lastname: Xavier
authors.affiliation: PPG-CR, Federal University of Health Sciences of Porto Alegre, Brazil.
authors.forename: Aline S
authors.initials: AS
authors.lastname: Pagnussat
authors.affiliation: PPG-CR, and Laboratory of Physiology, Department of Basic Sciences, Federal University of Health Sciences of Porto Alegre, Brazil. rasiafilho@pq.cnpq.br, aarf@ufcspa.edu.br.
authors.forename: Alberto
authors.initials: A
authors.lastname: Rasia-Filho
mesh_terms: D000679:Amygdala / Q000473:pathology* / Q000502:physiology; D000818:Animals; D001253:Astrocytes / Q000166:cytology; D003599:Cytoskeleton / Q000378:metabolism; D004195:Disease Models, Animal; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism*; D006333:Heart Failure / Q000378:metabolism*; D007150:Immunohistochemistry; D008297:Male; D009203:Myocardial Infarction / Q000378:metabolism*; D009457:Neuroglia / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism* / Q000473:pathology; D010805:Physical Conditioning, Animal; D051381:Rats; D017208:Rats, Wistar
chemical_list: D005904:Glial Fibrillary Acidic Protein