Influence of physical preconditioning on the responsiveness of rat pulmonary artery after pulmonary ischemia/reperfusion.
The aim of this work was to evaluate the effect of physical preconditioning in the responsiveness of rat pulmonary rings submitted to lung ischemia/reperfusion (IR). Wistar rats were divided into three groups: Sedentary sham-operated (SD/SHAM); sedentary submitted to ischemia/reperfusion (SD/IR) and trained submitted to ischemia/reperfusion (TR/IR) animals. Exercise training consisted in sessions of 60 min/day running sessions, 5 days/week for 8 weeks. Left pulmonary IR was performed by occluding for 90 min and reperfusing for 120 min. After that, pulmonary arteries were isolated and concentration-response curves to acetylcholine (ACh), histamine (HIST), sodium nitroprusside (SNP), phenylephrine and U46619 were obtained. Neither potency (-log EC(50)) nor maximal responses (E(max)) were modified for ACh and HIST in all groups. On the other hand, the potency for SNP was significantly increased in TR/IR group (8.23+/-0.06) compared to SD/IR group (7.85+/-0.04). Contractile responses mediated by a-adrenergic receptor were markedly decreased in IR groups (SD/IR: 6.75+/-0.06 and TR/IR: 6.62+/-0.04) compared to SD/SHAM (7.33+/-0.05). No changes were seen for the U46619 in all groups. In conclusion, the present study shows that exercise training has no protective actions in the local blood vessel where the IR process takes place.
Delbin
Maria Andréia
MA
Department of Physical Education, Institute of Biosciences, University of São Paulo State (UNESP), Rio Claro (SP), Brazil.
Moraes
Camila
C
Department of Physical Education, Institute of Biosciences, University of São Paulo State (UNESP), Rio Claro (SP), Brazil.
Camargo
Enilton
E
Department of Pharmacology, Faculty of Medical Sciences, P.O. Box 6111, State University of Campinas (UNICAMP), 13084-971, Campinas (SP), Brazil.
Mussi
Ricardo K
RK
Departments of Thoracic Surgery, Faculty of Medical Sciences, State University of Campinas (UNICAMP), 13084-971, Campinas (SP), Brazil.
Antunes
Edson
E
Department of Pharmacology, Faculty of Medical Sciences, P.O. Box 6111, State University of Campinas (UNICAMP), 13084-971, Campinas (SP), Brazil.
de Nucci
Gilberto
G
Department of Pharmacology, Faculty of Medical Sciences, P.O. Box 6111, State University of Campinas (UNICAMP), 13084-971, Campinas (SP), Brazil.
Zanesco
Angelina
A
Department of Physical Education, Institute of Biosciences, University of São Paulo State (UNESP), Rio Claro (SP), Brazil. Electronic address: azanesco@rc.unesp.br.
D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D008168:Lung / Q000098:blood supply*; D009566:Nitrates / Q000097:blood; D009573:Nitrites / Q000097:blood; D010805:Physical Conditioning, Animal / Q000502:physiology*; D011651:Pulmonary Artery / Q000502:physiology / Q000503:physiopathology*; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000503:physiopathology*; D014662:Vasoconstrictor Agents / Q000494:pharmacology; D014665:Vasodilator Agents / Q000494:pharmacology
D009566:Nitrates; D009573:Nitrites; D014662:Vasoconstrictor Agents; D014665:Vasodilator Agents