Oxygen therapy may worsen the survival rate in rats with monocrotaline-induced pulmonary arterial hypertension

Autor: Hidetaka Imagita, Wataru Kuwahara, Naoto Fujita, Makoto Asaeda, Natsuki Yamasaki, Kanako Eto
Rok vydání: 2018
Předmět:
Male
Pulmonology
medicine.medical_treatment
lcsh:Medicine
Superoxide dismutase activity
030204 cardiovascular system & hematology
Pathology and Laboratory Medicine
Oxygen
Hypoxemia
Rats
Sprague-Dawley
Random Allocation
0302 clinical medicine
Oxygen therapy
Medicine and Health Sciences
Medicine
Pulmonary Arteries
lcsh:Science
Immune Response
Pulmonary Hypertension
Monocrotaline
Multidisciplinary
Heart
Arteries
Survival Rate
Chemistry
Arterioles
Antioxidant capacity
Physical Sciences
Cardiology
Anatomy
medicine.symptom
Research Article
Chemical Elements
medicine.medical_specialty
Histology
Cardiac Ventricles
Chronic Obstructive Pulmonary Disease
Hypertension
Pulmonary
Immunology
chemistry.chemical_element
Pulmonary Artery
03 medical and health sciences
Signs and Symptoms
Diagnostic Medicine
Arteriole
Internal medicine
medicine.artery
Animals
Survival rate
Inflammation
Superoxide Dismutase
business.industry
lcsh:R
Oxygen Inhalation Therapy
Idiopathic Pulmonary Arterial Hypertension
Biology and Life Sciences
Rats
Disease Models
Animal
030228 respiratory system
chemistry
Cardiovascular Anatomy
Blood Vessels
lcsh:Q
business
Zdroj: PLoS ONE
PLoS ONE, Vol 13, Iss 9, p e0204254 (2018)
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0204254
Popis: Although oxygen therapy rapidly improves arterial oxygen saturation in idiopathic pulmonary arterial hypertension, the effects of chronic administration of oxygen are unknown. The purpose of the present study was to investigate the effects of chronic oxygen therapy on the histological changes and survival rate in rats with idiopathic pulmonary arterial hypertension. Idiopathic pulmonary arterial hypertension was induced by monocrotaline injection. The rats were then randomly assigned to receive or not receive oxygen therapy (O2 group and non-O2 group, respectively). The rats in the O2 group were exposed to a high (90%) oxygen environment from day 17 following injection of monocrotaline, when hypoxemia was first observed. The pulmonary arteriole walls were significantly thicker in monocrotaline-injected rats than in saline-injected rats as vehicle on day 19 and were significantly thicker in the rats that received oxygen therapy than in the rats that did not. Right ventricular inflammations were significantly higher in monocrotaline-injected rats than in saline-injected rats on day 19 and were significantly higher in the rats that received oxygen therapy than in the rats that did not. By day 20 after injection of monocrotaline, the survival rate was significantly lower in the rats that received oxygen therapy than in those that did not. Superoxide dismutase activity in the lungs was higher in monocrotaline-injected rats than in saline-injected rats on day 19 after monocrotaline injection and was also higher in the saline-injected rats that received oxygen therapy than in the saline-injected rats that did not. No interaction was detected between monocrotaline injection and oxygen therapy. These results suggest that chronic oxygen therapy worsens the histological changes and survival rate in idiopathic pulmonary arterial hypertension. The fact that degradation of the histological changes and survival rate was accompanied by increase in superoxide dismutase activity suggests that antioxidant capacity may contribute to the degradation.
Databáze: OpenAIRE
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