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γ‐linolenic acid‐containing diet attenuates bleomycin‐induced lung fibrosis in hamsters
Author(s) -
Ziboh Vincent A.,
Yun Monica,
Hyde Dallas M.,
Giri Shri N.
Publication year - 1997
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-997-0097-x
Subject(s) - bleomycin , lipidology , clinical chemistry , lung , medicine , fibrosis , pulmonary fibrosis , chemistry , pharmacology , endocrinology , chemotherapy
Although bleomycin (BLM), an antineoplastic drug, is used in the treatment of a variety of tumors, the mechanism(s) that contribute to its induced lung injury and fibrosis are not fully elucidated. Since alterations in the levels of certain fatty acid metabolites have been associated with BLM‐induced lung injury, we tested the effects of dietary γ‐linolenic acid (GLA)‐containing evening primrose oil on BLM‐induced morphological alterations in the hamster lung, the marked elevation of tissue hydroxyproline (a marker for collagen synthesis), and elevated generation of arachidonic acid metabolites (marker of inflammatory mediators). Our data revealed that after 14 d of dietary GLA‐containing oil (i) BLM‐induced elevation of lung hydroxyproline was suppressed ( P <0.05), (ii) the marked BLM‐induced elevation of lung leukotriene B 4 (LTB 4 ) (a marker of polymorphonuclear generation of proinflammatory LTB 4 ) was significantly suppressed ( P <0.05). The decrease in LTB 4 was accompanied by marked elevations ( P <0.05) of lung prostaglandin E 1 (PGE 1 ) and 15‐hydroxyeicosatrienoic acid (15‐HETrE), both with known antiinflammatory properties. Taken together, data from these studies suggest that dietary GLA‐containing oil contributes to tissue elevation of PGE 1 and 15‐HETrE, which in vivo may attenuate lung inflammation and fibrosis.