Respir Physiol Neurobiol. 2021 Sep;291:103695. doi: 10.1016/j.resp.2021.103695. Epub 2021 May 27.

Hypoxia-mediated alterations in pulmonary surfactant protein expressions: Beneficial effects of quercetin prophylaxis.

Respiratory physiology & neurobiology

Ankit Tripathi, Bhuvnesh Kumar, Sarada S K Sagi

PMID: 34052411 DOI: 10.1016/j.resp.2021.103695

Abstract

We have compared the prophylactic efficacies of quercetin and salbutamol in preventing pulmonary surfactants oxidation under hypoxia. Male SD rats supplemented orally with quercetin (50 mg/Kg BW) and salbutamol (2 mg/Kg BW) were exposed to hypobaric hypoxia (7,620 m for 6 h). Hypoxia-mediated elevation in oxidative stress, inflammation, and extravasations of LDH & albumin content in BALF of rats were assessed. Western blotting and mRNA studies determined the differential expressions of Nrf-2, HO-1, and associated surfactant proteins (SP-A, SP-B, SP-C, & SP-D) in rat lungs. Later, the lung configuration under hypoxia was assessed histopathologically. Quercetin and salbutamol pretreatment considerably restored the expressions of Nrf-2, HO-1, and surfactant proteins to normal by attenuating the increase in oxidative stress, inflammation, and extravasations of plasma proteins in the animals under hypoxia. The histopathology has also evidenced the protective effect of quercetin in retaining normal lung architecture under hypoxia over salbutamol. The present study indicates the effectiveness of quercetin prophylaxis in preventing pulmonary surfactants oxidation under hypoxia over salbutamol.

Copyright © 2021 Elsevier B.V. All rights reserved.

Keywords: HAPE; Oxidant injury; Pulmonary surfactants; Quercetin; Salbutamol

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't