Related Experiment Video
Updated: May 27, 2025

Increasing Pulmonary Artery Pulsatile Flow Improves Hypoxic Pulmonary Hypertension in Piglets
Published on: May 11, 2015
Chronic intermittent hypobaric hypoxia prevents pulmonary arterial hypertension through maintaining eNOS homeostasis
Hai-Shuang Li1, Hui-Jie Liu1, Yu Zhang1
1Department of Physiology, Hebei Medical University, Shijiazhuang, 050017, China.
Aims:
Pulmonary arterial hypertension (PAH) is a pathological condition in which pulmonary artery pressure is elevated which causes patients to die of right heart failure. Chronic intermittent hypobaric hypoxia (CIHH) represents a novel method of intermittently exposing subjects to a simulated plateau hypobaric hypoxia environment. This study investigates the potential preventive and protective effects of CIHH on PAH.
Main Methods:
Male Sprague-Dawley rats were randomly divided into four groups: control group (Con), chronic intermittent hypobaric hypoxia group (CIHH), pulmonary arterial hypertension group (PAH), chronic intermittent hypobaric hypoxia + pulmonary arterial hypertension group (CIHH + PAH). To evaluate the effects of CIHH on PAH, a range of techniques was employed, including pulmonary hemodynamics, vascular reactivity assay, Western blot, RNA sequencing, HE staining and co-immunoprecipitation.
Key Findings:
CIHH was demonstrated to reduce pulmonary artery constriction and enhance relaxation, reducing the mean pulmonary artery pressure in PAH rats. This is achieved through attenuating the CaM/eNOS (Calmodulin,CaM)protein interaction and increasing the CaV1/eNOS (Caveolin-1,CaV1) protein interaction, thereby preventing eNOS overactivation contribution to improving NO bioavailability in PAH rats.
Significance:
CIHH prevents PAH by maintaining eNOS homeostasis in PAH rats.
Related Concept Videos
Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue,...
Pulmonary Hypertension: Classification and Pathogenesis
There are various classifications for PH, each relating to different underlying causes and also...
Physiological Control of Respiration
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists
ETs are synthesized through a complex sequence of enzymatic steps, primarily involving an enzyme referred to as endothelin-converting enzyme...
Acute Respiratory Failure-II
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

