title: Plasma platelet-activating factor-acetyl hydrolase activity and the levels of free forms of biomarker of lipid peroxidation in cerebrospinal fluid of patients with aneurysmal subarachnoid hemorrhage.
abstract: BACKGROUND
  Free radicals and lipid peroxidation are thought to be related to the vasospasm generation after subarachnoid hemorrhage (SAH). Plasma platelet-activating factor-acetyl hydrolase (PAF-AH) degrades phospholipids with an oxidatively modified fatty acyl chain.
  
  
  OBJECTIVE
  To compare plasma PAF-AH activity and free forms of biomarker of lipid peroxidation in cerebrospinal fluid (CSF) between patients with and without symptomatic vasospasm (SVS) after SAH.
  
  
  METHODS
  The identification of PAF-AH in CSF was performed by Western blotting. The genotype at position 279 of the plasma PAF-AH gene was determined. The activities of PAF-AH and the levels of free 8-iso-prostaglandin F2α (free isoPs), free hydroxyoctadecadienoic acid (free HODE), and free hydroxyeicosatetraenoic acid (free HETE) in CSF were measured.
  
  
  RESULTS
  The PAF-AH in CSF was confirmed to be only the plasma type. The genotype of the plasma PAF-AH was not different between patients with and without SVS. Free isoPs, free HODE, and free HETE showed higher values in patients without SVS in 0 to 4 days and 5 to 9 days after SAH. The PAF-AH activity also was higher in patients without SVS in 0 to 4 days and 5 to 9 days after SAH. The associations between PAF-AH activity and free isoPs, and between PAF-AH activity and free HODE were significant.
  
  
  CONCLUSIONS
  Oxidized lipids of lipoproteins and blood cell membranes produced by reactive oxygen species in CSF when SAH occurs may be the main source of lipid peroxidation. Plasma PAF-AH can hydrolyze oxidized phospholipids, and may attenuate the spreading of lipid peroxidation and participate in defense mechanisms against vasospasm after SAH.
authors.affiliation: Physiological Chemistry, Faculty of Pharmaceutical Sciences, Teikyo University, Midori-ku, Sagamihara-shi, Kanagawa, Japan. yakae@imizu-city-hosp.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hirashima
authors.forename: Masaru
authors.initials: M
authors.lastname: Doshi
authors.forename: Nakamasa
authors.initials: N
authors.lastname: Hayashi
authors.forename: Shunro
authors.initials: S
authors.lastname: Endo
authors.forename: Yoko
authors.initials: Y
authors.lastname: Akazawa
authors.forename: Mototada
authors.initials: M
authors.lastname: Shichiri
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Yoshida
mesh_terms: D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase / Q000097:blood* / Q000235:genetics*; D000368:Aged; D015415:Biomarkers / Q000097:blood / Q000134:cerebrospinal fluid; D015237:Dinoprost / Q000031:analogs & derivatives / Q000134:cerebrospinal fluid; D004789:Enzyme Activation / Q000502:physiology; D005231:Fatty Acids, Unsaturated / Q000134:cerebrospinal fluid; D005260:Female; D005838:Genotype; D006454:Hemoglobins / Q000134:cerebrospinal fluid; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000134:cerebrospinal fluid; D015227:Lipid Peroxidation / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology; D010743:Phospholipids / Q000378:metabolism; D013345:Subarachnoid Hemorrhage / Q000097:blood / Q000134:cerebrospinal fluid / Q000235:genetics; D020301:Vasospasm, Intracranial / Q000097:blood / Q000134:cerebrospinal fluid / Q000175:diagnosis
chemical_list: D015415:Biomarkers; D005231:Fatty Acids, Unsaturated; D006454:Hemoglobins; D006893:Hydroxyeicosatetraenoic Acids; D010743:Phospholipids; C495366:hydroxyoctadecadienoic acid; C075750:8-epi-prostaglandin F2alpha; D015237:Dinoprost; D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase