Immunohistochemical localization of surfactant protein A in N-bis (2-hydroxypropyl) nitrosamine-induced lung tumors in rats.
Surfactant protein A (SP-A) is most abundant protein associated with pulmonary surfactant which is synthesized by alveolar type II cells in the alveoli. In this study, we localized SP-A in experimentally induced pulmonary hyperplasias and tumors in rats, by immunohistochemistry. When rats were given a single intraperitoneal injection of N-bis (2-hydroxypropyl) nitrosamine (BHPN) followed by exposed to mixture gases of O3 and NO2, hyperplastic alveolar type II cells stained with the antibody against SP-A were located in the alveolar walls near the alveolar ducts. Adenomas and adenocarcinomas were stained with the anti-SP-A antibody in the lung parenchyma. These immunohistochemical findings suggested that the lung tumors induced in rats treated with BHPN and additionally exposed to mixture gases of O3 and NO2 are derived from mainly alveolar type II cells.
Sakai
K
K
Department of Nutrition, School of Medicine, University of Tokushima, Japan.
Kohri
T
T
Mizunuma
T
T
Ichinose
T
T
Sagai
M
M
Kishino
Y
Y
D000818:Animals; D002273:Carcinogens / Q000633:toxicity; D006965:Hyperplasia; D007150:Immunohistochemistry; D008168:Lung / Q000187:drug effects / Q000473:pathology; D008175:Lung Neoplasms / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D008297:Male; D009602:Nitrosamines / Q000633:toxicity; D011510:Proteolipids / Q000378:metabolism*; D037662:Pulmonary Surfactant-Associated Protein A; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar
D002273:Carcinogens; D009602:Nitrosamines; D011510:Proteolipids; D037662:Pulmonary Surfactant-Associated Protein A; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants; C012457:diisopropanolnitrosamine