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Influence of mineral dusts on metabolism of arachidonic acid by alveolar macrophage.
| Content Provider | Semantic Scholar |
|---|---|
| Copyright Year | 1994 |
| Abstract | The alveolar macrophage (AM) responds to stimuli such as coal mine dust by releasing inflammatory mediators such as cytokines, growth factors, reactive oxygen species, and eicosanoids. Eicosanoids are synthesized by AM through the action of cyclooxygenase and lipoxygenase enzymes and serve to modulate the proinflammatory function of this cell as part of the lungs' host defense mechanism. Reactive oxygen species can be generated by AM as a by-product in the biosynthetic pathway of the prostaglandins. AM produces primarily prostaglandin E2, thromboxane A2, and leukotriene B4 as part of the cellular response to an inflammatory stimulus. There is evidence to suggest that eicosanoid production by AM is functionally linked to both surface interaction with mine dust particles like silica and by the phagocytosis of the dust particle itself. In this report, we examined the effects of an antioxidant, vitamin E, on dust-induced synthesis of PGE2 and TXB2 in vitro and in vivo by AM obtained by bronchoalveolar lavage from rats. We also looked at the effects of the surface of silica particles on AM eicosanoid biosynthesis under conditions of calcination, a process that removes exposed hydroxyl groups from the surface of silica particles, thus reducing the likelihood of soluble hydroxyl radical formation. Treatment of AM with vitamin E in vivo and in vitro reduced the augmentation in eicosanoid production usually observed when AM are exposed to mine dusts. These results suggest that vitamin E may effectively reduce the inflammatory and fibrotic response produced by inhalation of mineral dust through an antioxidant mechanism.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 97 |
| Ending Page | 100 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| PubMed reference number | 7705314v1 |
| Volume Number | 102 |
| Journal | Environmental health perspectives |
| Alternate Webpage(s) | http://ftp.ncbi.nlm.nih.gov/pub/pmc/93/7b/envhper00409-0103.PMC1567000.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Anabolism Antioxidants Arachidonic Acid Biosynthetic Pathways Coal Defense Mechanisms Eicosanoid Production Eicosanoids Hydroxyl Radical In Vitro [Publication Type] Inspiration function Irrigation Leukotriene B4 Leukotrienes Lipoxygenase Lung Macrophages, Alveolar Phagocytosis Prostaglandin E2 Prostaglandin-Endoperoxide Synthase Prostaglandins Pulmonary Alveolar Proteinosis Silicon Dioxide Thromboxane A2 Thromboxane B2 Thromboxanes Vitamin E icosanoid biosynthetic process positive regulation by symbiont of defense-related host reactive oxygen species production |
| Content Type | Text |
| Resource Type | Article |
