Association of Adrenal Pheochromocytoma and Lung Pathology in Inhalation Studies with Particulate Compounds in the Male F344 Rat—The National Toxicology Program Experience
Free accessResearch articleFirst published online February, 2002
Association of Adrenal Pheochromocytoma and Lung Pathology in Inhalation Studies with Particulate Compounds in the Male F344 Rat—The National Toxicology Program Experience
Systemic hypoxemia, occurring in space-occupying lung pathologies such as inflammation and neoplasms, reduces the gas exchange area and stimulates catecholamine secretion from the adrenal medulla where chronic endocrine hyperactivity may lead to hyperplasia and neoplasia. We investigated the possible correlation between nonneoplastic chronic pulmonary lesions and adrenal pheochromocytom a in 9 recent, NTP, 2-year particulate inhalation studies in male F344 rats. Re-evaluation for chronic active inflammation, interstitial fibrosis, alveolar epithelial hyperplasia, squamous metaplasia, proteinosis, and histiocytosis revealed significant associations of pheochromocytom a only with the severity of inflammation and fibrosis. Nickel oxide, cobalt sulfate, indium phosphide, talc, and nickel subsulfide studies showed chemical-related incidences of adrenal pheochromocytom a and significant (p < 0.01) associations with inflammation and fibrosis. Gallium arsenide, vanadium pentoxide, molybdenum trioxide, and nickel sulfate hexahydrate studies revealed an increased incidence and/or severity of nonneoplastic lung lesions, but no increased incidence of pheochromocytoma . Although gallium arsenide and molybdenum trioxide showed no dose-related increase in pheochromocytoma, a significant (p < 0.01) correlation of the latter with the severity of fibrosis and inflammation occurred. In the vanadium pentoxide and nickel sulfate hexahydrate studies, no relationship between nonneoplastic lung lesions and pheochromocytoma was manifested. Our investigation assessed the strength of these various associations and supports the possible roles of 2 chronic pulmonary lesions—fibrosis and inflammation—and hypoxemi a in the induction of pheochromocytom a in the F344 male rat.
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