title: Molecular-biological analysis of acute lung injury (ALI) induced by heat exposure and/or intravenous administration of oleic acid.
abstract: The aim of this study was to molecular-biologically investigate the interaction between heat exposure and pulmonary fat embolization in regards to the development of acute lung injury (ALI). Ten-week-old Wistar male rats were divided into four groups: (1) oleic acid injected into caudal vein after heat exposure, (2) oleic acid injected without heat exposure, (3) soybean oil injected after heat exposure, and (4) soybean oil injected without heat exposure, and then mRNA expression of eight inflammatory mediators related to ALI/acute respiratory distress syndrome (ARDS) and heat shock protein 70 (Hsp70) in lung was determined 1h after the injection. mRNA expression of interleukin 1 beta (Il1b), tumor necrosis factor alpha (Tnfa), vascular endothelial growth factor A (Vegfa), transforming growth factor beta 1 (Tgfb1) and Hsp70 was significantly increased by heat exposure, while that of Il1b, interleukin 6 (Il6), Tnfa, macrophage inflammatory protein 2 (Mip2) and granulocyte macrophage-colony stimulating factor (Gm-csf) was significantly elevated by the injection of oleic acid. Moreover, the expressions of inflammatory cytokines and chemokines in lung almost paralleled their mRNA expressions. In particular, IL-1β expression was synergistically elevated by heat exposure followed by injection of oleic acid. Additionally, IL-6 expression tended to increase under the same conditions as well. It is likely that heat exposure itself injures lung tissue within a short time, and that more than two conditions which induce ALI/ARDS interact with each other synergistically, exacerbating the development of ALI/ARDS.
authors: Department of Forensic Medicine and Sciences, Mie University Graduate School of Medicine, Edobashi 2-174, Tsu, Mie 514-8507, Japan. inoueh@doc.medic.mie-u.ac.jp
authors: Hiromasa
authors: H
authors: Inoue
authors: Yasuhisa
authors: Y
authors: Nakagawa
authors: Mayumi
authors: M
authors: Ikemura
authors: Eri
authors: E
authors: Usugi
authors: Masayuki
authors: M
authors: Nata
mesh_terms: D055371:Acute Lung Injury / Q000209:etiology* / Q000503:physiopathology; D061605:Administration, Intravenous; D000818:Animals; D004195:Disease Models, Animal; D004620:Embolism, Fat / Q000150:complications* / Q000209:etiology; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D006979:Hyperthermia, Induced / Q000009:adverse effects; D007564:Japan; D008297:Male; D019301:Oleic Acid / Q000008:administration & dosage / Q000009:adverse effects*; D051381:Rats; D017208:Rats, Wistar; D012128:Respiratory Distress Syndrome / Q000209:etiology / Q000503:physiopathology
chemical_list: D019301:Oleic Acid