title: Heme oxygenase-1 is expressed in carotid atherosclerotic plaques infected by Helicobacter pylori and is more prevalent in asymptomatic subjects.
abstract: OBJECTIVE
  It is not well established what are the features, if any, that distinguish symptomatic from asymptomatic carotid atherosclerotic plaques. Inducible heme oxygenase-1 (HO-1) is a component of cellular defense mechanisms against oxidative stress. We aimed to assess the presence of Helicobacter pylori (H pylori) and the expression of HO-1 in carotid atherosclerotic plaques of patients with and without prior neurologic symptoms attributable to the operated artery.
  
  
  METHODS
  We examined 25 symptomatic and 23 asymptomatic carotid atherosclerotic plaques removed during endarterectomy and 7 normal carotid arteries obtained at autopsy. We investigated the presence of H pylori DNA in the vessel wall and performed immunohistochemical detection of HO-1.
  
  
  RESULTS
  H pylori DNA was present in 28 plaques and HO-1 was expressed in 30 plaques. HO-1 was found in 27 H pylori-positive specimens but in only 3 H pylori-negative specimens (P<0.001). All 7 normal carotid arteries were negative for both H pylori and HO-1. Although 82% of asymptomatic specimens were positive for H pylori and 87% for HO-1, only 36% of symptomatic specimens were positive for both H pylori and HO-1 (P<0.01).
  
  
  CONCLUSIONS
  This study suggests a strong association between H pylori infection and expression of HO-1 in carotid atherosclerotic plaques. There was a substantial prevalence of these features in specimens obtained from asymptomatic subjects.
authors.affiliation: Institute for Neurological Research, FLENI, Buenos Aires, Argentina. sameriso@fleni.org.ar
authors.forename: Sebastian F
authors.initials: SF
authors.lastname: Ameriso
authors.forename: Agustina Ruiz
authors.initials: AR
authors.lastname: Villamil
authors.forename: Christine
authors.initials: C
authors.lastname: Zedda
authors.forename: Juan C
authors.initials: JC
authors.lastname: Parodi
authors.forename: Sergio
authors.initials: S
authors.lastname: Garrido
authors.forename: María Inés
authors.initials: MI
authors.lastname: Sarchi
authors.forename: Marcelo
authors.initials: M
authors.lastname: Schultz
authors.forename: Jorge
authors.initials: J
authors.lastname: Boczkowski
authors.forename: Gustavo E
authors.initials: GE
authors.lastname: Sevlever
mesh_terms: D000368:Aged; D050197:Atherosclerosis; D001344:Autopsy; D002339:Carotid Arteries / Q000201:enzymology / Q000382:microbiology / Q000473:pathology; D002340:Carotid Artery Diseases / Q000150:complications / Q000175:diagnosis / Q000201:enzymology* / Q000382:microbiology*; D016893:Carotid Stenosis / Q000201:enzymology / Q000473:pathology; D003251:Constriction, Pathologic / Q000473:pathology; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D005260:Female; D016481:Helicobacter Infections / Q000150:complications / Q000201:enzymology* / Q000382:microbiology; D016480:Helicobacter pylori / Q000378:metabolism*; D051547:Heme Oxygenase-1 / Q000096:biosynthesis* / Q000502:physiology; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D018384:Oxidative Stress; D012307:Risk Factors; D013997:Time Factors
chemical_list: D004247:DNA; D051547:Heme Oxygenase-1