Faculty Collaboration Database

Role of endoplasmic reticulum stress in impaired neonatal lung growth and bronchopulmonary dysplasia. PLoS One 2022;17(8):e0269564

Date

08/27/2022

Pubmed ID

36018859

Pubmed Central ID

PMC9417039

DOI

10.1371/journal.pone.0269564

Scopus ID

2-s2.0-85137126858 (requires institutional sign-in at Scopus site)   5 Citations

Abstract

Myeloperoxidase (MPO), oxidative stress (OS), and endoplasmic reticulum (ER) stress are increased in the lungs of rat pups raised in hyperoxia, an established model of bronchopulmonary dysplasia (BPD). However, the relationship between OS, MPO, and ER stress has not been examined in hyperoxia rat pups. We treated Sprague-Dawley rat pups with tunicamycin or hyperoxia to determine this relationship. ER stress was detected using immunofluorescence, transcriptomic, proteomic, and electron microscopic analyses. Immunofluorescence observed increased ER stress in the lungs of hyperoxic rat BPD and human BPD. Proteomic and morphometric studies showed that tunicamycin directly increased ER stress of rat lungs and decreased lung complexity with a BPD phenotype. Previously, we showed that hyperoxia initiates a cycle of destruction that we hypothesized starts from increasing OS through MPO accumulation and then increases ER stress to cause BPD. To inhibit ER stress, we used tauroursodeoxycholic acid (TUDCA), a molecular chaperone. To break the cycle of destruction and reduce OS and MPO, we used N-acetyl-lysyltyrosylcysteine amide (KYC). The fact that TUDCA improved lung complexity in tunicamycin- and hyperoxia-treated rat pups supports the idea that ER stress plays a causal role in BPD. Additional support comes from data showing TUDCA decreased lung myeloid cells and MPO levels in the lungs of tunicamycin- and hyperoxia-treated rat pups. These data link OS and MPO to ER stress in the mechanisms mediating BPD. KYC's inhibition of ER stress in the tunicamycin-treated rat pup's lung provides additional support for the idea that MPO-induced ER stress plays a causal role in the BPD phenotype. ER stress appears to expand our proposed cycle of destruction. Our results suggest ER stress evolves from OS and MPO to increase neonatal lung injury and impair growth and development. The encouraging effect of TUDCA indicates that this compound has the potential for treating BPD.

Author List

Pritchard KA Jr, Jing X, Teng M, Wells C, Jia S, Afolayan AJ, Jarzembowski J, Day BW, Naylor S, Hessner MJ, Konduri GG, Teng RJ

Authors

Adeleye James Afolayan MD Associate Professor in the Pediatrics department at Medical College of Wisconsin
Martin J. Hessner PhD Professor in the Pediatrics department at Medical College of Wisconsin
Jason A. Jarzembowski MD, PhD Sr Associate Dean, CEO CSG, Professor in the Pathology department at Medical College of Wisconsin
Xi-Gang Jing Research Scientist I in the Pediatrics department at Medical College of Wisconsin
Girija Ganesh Konduri MD Chief, Professor in the Pediatrics department at Medical College of Wisconsin
Kirkwood A. Pritchard PhD Professor in the Surgery department at Medical College of Wisconsin
Ru-Jeng Teng MD Professor in the Pediatrics department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Animals, Newborn
Bronchopulmonary Dysplasia
Disease Models, Animal
Endoplasmic Reticulum Stress
Humans
Hyperoxia
Infant, Newborn
Lung
Pneumonia
Proteomics
Rats
Rats, Sprague-Dawley
Tunicamycin