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Different apoprotein(a) isoform proportions in serum and carotid plaque.

Abstract：

INTRODUCTION:Cardio- and/or cerebro-vascular risk are associated with high lipoprotein (a) [Lp(a)] levels and low-molecular-weight (LMW) apo(a) isoforms. Aims of this study were to evaluate the deposition of apo(a) isoforms and apoprotein B (apo B) in atherosclerotic plaque from patients (males and females) who had carotid endarterectomy for severe stenosis, and to identify differences between patients classified by gender and divided according to the stability or instability of their plaques. MATERIALS AND METHODS:We determined lipids, apo B and Lp(a) in serum and plaque extracts from 55 males and 25 females. Apo(a) was phenotyped and isoforms were classified by number of kringle IV (KIV) repeats. RESULTS:Lp(a) levels were higher in female serum and plaque extracts than in male samples, while apo B levels were lower. More Lp(a) than apo B deposition was observed in plaque after normalization for serum levels. Thirty-one different apo(a) isoforms were detected in our patients, with a double band phenotype in 94% of cases. In both sexes, the low/high (L/H) molecular weight apo(a) isoform expression ratio was significantly higher in plaque than in serum. Females with unstable plaques had higher Lp(a) levels in both serum and tissue extracts, and fewer KIV repeats of the principal apo(a) isoform in the serum than the other female group or males. CONCLUSIONS:In both sexes, the same apo(a) isoforms are found in serum and atherosclerotic plaque, but in different proportions: in plaque, LMW apo(a) is almost always more strongly accumulated than HMW apo(a), irrespective of any combination of apo(a) isoforms in double band phenotypes or Lp(a) serum levels. Moreover, serum and tissue Lp(a) levels were higher in females than in males, and particularly in the group with unstable plaques.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Baldo G,Giunco S,Kontothanassis D,Baiocchi MR,Valerio A,Frego M

doi

10.1016/j.atherosclerosis.2006.06.006

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

177-85

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(06)00347-9

journal_volume

193

pub_type

杂志文章

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