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Full-Text Articles in Biochemistry, Biophysics, and Structural Biology
The Regulation Of Platelet Activating Factor Acetylhydrolase By Oxidized Phospholipids, Rachael Griffiths
The Regulation Of Platelet Activating Factor Acetylhydrolase By Oxidized Phospholipids, Rachael Griffiths
Theses and Dissertations
Platelet-activating factor acetylhydrolase (PAFAH) is elevated in atherosclerosis and may play a role in pathogenesis of this disease. Molecular mechanisms regulating the expression of this lipoprotein-associated PLA2 are indistinct. Mildy oxidized low density lipoprotein (oxLDL) and monocytes (the primary source of PAFAH) are co-localized in early atheromas. Monocytes are activated by oxidized phospholipids (oxPL) in the oxLDL particle. We hypothesized that oxPL-activated monocytes are the source of increased levels of PAFAH in atherosclerosis. We found that PAFAH expression is significantly induced by OxPAPC and in particular long-chain fractions of oxPAPC in monocytes and cytokine-differentiated DC, but not cytokine-differentiated MO. Furthermore, …
Regulation Of Platelet-Activating Factor Acetylhydrolase By Oxidized Phospholipids And Proinflammatory Cytokines, Muralikrishna Mukkamala
Regulation Of Platelet-Activating Factor Acetylhydrolase By Oxidized Phospholipids And Proinflammatory Cytokines, Muralikrishna Mukkamala
Theses and Dissertations
Platelet-Activating Factor Acetylhydrolase (PAFAH) is a monocyte-derived phospholipase A2 that catalyzes the hydrolysis of platelet-activating factor (PAF) and has been implicated in atherosclerosis. Although PAF and other proinflammatory stimuli are postulated to induce the enzyme, mechanisms controlling PAFAH expression are largely unknown at present. We have shown that PAFAH induction in monocytes is increased in response to oxidized phospholipids. The PAFAH 5' flanking region has at least 10 putative Stat elements, and IL-6 has been shown to be downstream from the prostaglandin receptor, EP2, which has been shown to bind oxidized phospholipids, prompting the hypothesis that Stat proteins might regulate …