Vascular remodeling and ET-1 expression in rat strains with different responses to chronic hypoxia
| Autor: | Julia M. Polak, Lu Long, P. Clift, Martin R. Wilkins, Nicholas W. Morrell, J. I. Aguirre, Paul D. Upton |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Pulmonary and Respiratory Medicine
Male medicine.medical_specialty Pathology Pulmonary Circulation Physiology Gene Expression Biology Pulmonary Artery Rats Inbred WKY Species Specificity Physiology (medical) Internal medicine medicine.artery medicine Animals RNA Messenger Protein Precursors Hypoxia Lung Endothelin-1 Endothelins Respiratory disease Epithelial Cells Cell Biology Hypoxia (medical) medicine.disease Blotting Northern Pulmonary hypertension Endothelin 1 Immunohistochemistry Rats Inbred F344 Rats Endocrinology medicine.anatomical_structure Pulmonary artery Chronic Disease medicine.symptom Endothelin receptor Immunostaining |
| Zdroj: | Europe PubMed Central |
| ISSN: | 1040-0605 |
| Popis: | Chronic hypoxia leads to a greater degree of pulmonary hypertension in the Wistar-Kyoto (WKY) rat than in the Fischer 344 (F-344) rat. We questioned whether this difference is associated with baseline differences in pulmonary artery anatomy, a greater degree of hypoxia-induced pulmonary vascular remodeling in the WKY rat, and/or differences in expression of endothelin (ET)-1. Male F-344 and WKY rats were maintained in normoxia or normobaric hypoxia for 21 days. Morphometry revealed that baseline pulmonary artery anatomy was similar in the two strains. However, during chronic hypoxia, the WKY rats developed a greater degree of muscularization of small pulmonary arteries. Baseline plasma and lung immunoreactive ET-1 levels were similar in the WKY and F-344 rats and increased significantly during hypoxia in the WKY rats. Northern analysis demonstrated increased lung preproET-1 mRNA during hypoxia in both strains, with a greater increase in WKY rats. Immunostaining demonstrated increased ET-1 in bronchial epithelium and peripheral pulmonary arteries during hypoxia, although to a greater degree in the WKY rats. We conclude that the WKY strain demonstrates increased susceptibility to hypoxia-induced pulmonary vascular remodeling compared with the F-344 strain and that increased lung and circulating ET-1 levels during hypoxia may partly explain this difference. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|