RT info:eu-repo/semantics/article
T1 Maladaptive Pulmonary Vascular Responses to Chronic Sustained and Chronic Intermittent Hypoxia in Rat
A1 Prieto-Lloret, Jesus
A1 Olea, Elena
A1 Gordillo-Cano, Ana
A1 Docio, Inmaculada
A1 Obeso, Ana
A1 Gomez-Niño, Angela
A1 Aaronson, Philip I.
A1 Rocher, Asuncion
AB Chronic sustained hypoxia (CSH), as found in individuals living at a high altitude or in patients suffering respiratory disorders, initiates physiological adaptations such as carotid body stimulation to maintain oxygen levels, but has deleterious effects such as pulmonary hypertension (PH). Obstructive sleep apnea (OSA), a respiratory disorder of increasing prevalence, is characterized by a situation of chronic intermittent hypoxia (CIH). OSA is associated with the development of systemic hypertension and cardiovascular pathologies, due to carotid body and sympathetic overactivation. There is growing evidence that CIH can also compromise the pulmonary circulation, causing pulmonary hypertension in OSA patients and animal models. The aim of this work was to compare hemodynamics, vascular contractility, and L-arginine-NO metabolism in two models of PH in rats, associated with CSH and CIH exposure. We demonstrate that whereas CSH and CIH cause several common effects such as an increased hematocrit, weight loss, and an increase in pulmonary artery pressure (PAP), compared to CIH, CSH seems to have more of an effect on the pulmonary circulation, whereas the effects of CIH are apparently more targeted on the systemic circulation. The results suggest that the endothelial dysfunction evident in pulmonary arteries with both hypoxia protocols are not due to an increase in methylated arginines in these arteries, although an increase in plasma SDMA could contribute to the apparent loss of basal NO-dependent vasodilation and, therefore, the increase in PAP that results from CIH.
PB MDPI
SN 2076-3921
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/81622
UL https://uvadoc.uva.es/handle/10324/81622
LA eng
NO Antioxidants (Basel). 2021 Dec 27;11(1):54
NO Producción Científica
DS UVaDOC
RD 12-feb-2026