Heme oxygenase-1 is expressed in carotid atherosclerotic plaques infected by Helicobacter pylori and is more prevalent in asymptomatic subjects.
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.
Ameriso
Sebastian F
SF
Institute for Neurological Research, FLENI, Buenos Aires, Argentina. sameriso@fleni.org.ar
Villamil
Agustina Ruiz
AR
Zedda
Christine
C
Parodi
Juan C
JC
Garrido
Sergio
S
Sarchi
María Inés
MI
Schultz
Marcelo
M
Boczkowski
Jorge
J
Sevlever
Gustavo E
GE
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
D004247:DNA; D051547:Heme Oxygenase-1