In the present study we analyzed structural characteristics of muscular pulmonary arteries and arterioles in two classic models of pulmonary hypertension, the rat hypoxia and monocrotaline models. We hypothesized that an increase in medial cross-sectional area would result in reduction of the lumen area and that these parameters would correlate with the increase in pulmonary artery pressure (PA...

We examined the effects of acute and/or chronic hypokalemia on responses to 30 min of hypoxia and recovery in the isolated, perfused heart model. We found that both acute hypokalemia and chronic hypokalemia impaired contractility [expressed as maximum slope of pressure increase over time (dP/d t): 501 ± 49 and 529 ± 48 vs. 1,302 ± 118 mmHg/s, P < 0.01] and recovery of ATP concentrations (determ...

One of the most fundamental molecular processes in response to hypoxia is activation and stabilization a transcriptional factor called induced 1a (HIF-1a), which responsible for regulation many downstream effector genes. Multiple key biological pathways such as proliferation, energy metabolism, invasion, metastasis are governed by these This article discusses role hypoxia-inducible (HIF-1a) met...

Citation: Nydegger C, Martinelli C, Di Marco F, Bulfamante G, von Segesser L, Tozzi P, Samaja M and Milano G (2018) Phosphodiesterase-5 Inhibition Alleviates Pulmonary Hypertension and Basal Lamina Thickening in Rats Challenged by Chronic Hypoxia. Front. Physiol. 9:289. doi: 10.3389/fphys.2018.00289 Phosphodiesterase-5 Inhibition Alleviates Pulmonary Hypertension and Basal Lamina Thickening in ...

We examined the effects of chronic intermittent hypoxia (IH) on the hemodynamics of systemic circulation in rat. Chronic IH has no effect on the hemodynamics in the normoxia condition, but it could effectively prevent the fall of hemodynamics during acute hypoxia.

Changes in brain vascularity in adult rats during adaptation to chronic normobaric hypoxia with or without elevated CO(2) were morphometrically investigated. Immunohistochemistry with anti-rat endothelial cell antigen (RECA-1) antibody was carried out for the vascular analysis. After the rats were subjected to hypoxia for 2 to 8 weeks (wks)(10 percent O(2) in N(2)), the total area of blood vess...

Chronic inflammation and reduced adiponectin are widely observed in the white adipose tissue in obesity. However, the cause of the changes remains to be identified. In this study, we provide experimental evidence that hypoxia occurs in adipose tissue in obese mice and that adipose hypoxia may contribute to the endocrine alterations. The adipose hypoxia was demonstrated by a reduction in the int...

Chronic prenatal hypoxia is a damaging to fetal development and may have various consequences, including hearing loss. Connexin 26 (Cx26) is one of the major protein subunits required for gap junction formation, and has an important role in maintaining homeostasis in the cochlea and normal hearing. Cx26 mutation and expression abnormality are closely associated with inherited nonsyndromic deafn...

de Frutos S, Nitta CH, Caldwell E, Friedman J, González Bosc LV. Regulation of soluble guanylyl cyclase1 expression in chronic hypoxia-induced pulmonary hypertension: role of NFATc3 and HuR. Am J Physiol Lung Cell Mol Physiol 297: L475–L486, 2009. First published July 10, 2009; doi:10.1152/ajplung.00060.2009.—The nitric oxide/soluble guanylyl cyclase (sGC) signal transduction pathway plays an i...