Role of lipoprotein (a) and LPA KIV2 repeat polymorphism in bicuspid aortic valve stenosis and calcification: a proof of concept study

Elena Sticchi, Betti Giusti, Antonella Cordisco, Anna Maria Gori, Alice Sereni, Francesco Sofi, Fabio Mori, Stefania Colonna, Maria Pia Fugazzaro, Guglielmina Pepe, Stefano Nistri, Rossella Marcucci

Research output: Contribution to journalArticlepeer-review

Abstract

Hemodynamic valvular impairment is a frequent determinant of the natural history of bicuspid aortic valve (BAV). The role of elevated Lp(a) levels and LPA Kringle IV type 2 (KIV-2) size polymorphism in influencing aortic valve calcification and stenosis development in patients with tricuspid aortic valve was recognized. In this study, we investigate the association between Lp(a) and LPA KIV-2 repeat number, and the presence of calcification and stenosis in BAV patients. Sixty-nine patients [79.7% males; median age 45(30–53) yrs], consecutively referred to Center for Cardiovascular Diagnosis or Referral Center for Marfan syndrome or related disorders, AOU Careggi, from June to November 2014, were investigated. For each patient, clinical (ECG and echocardiography) and laboratory [Lp(a) (Immunoturbidimetric assay) and LPA KIV-2 repeat number (real-time PCR)] evaluation were performed. Patients were compared with 69 control subjects. No significant association between Lp(a) circulating levels and LPA KIV-2 repeat number and BAV was evidenced. Among BAV patients, significantly higher Lp(a) levels according to calcification degree were found [no calcifications:78(42–159) mg/L, mild/moderate: 134(69–189) mg/L; severe: 560(286–1511) mg/L, p = 0.008]. Conversely, lower LPA KIV-2 repeat numbers in subjects with more severe calcification degree were observed. Furthermore, higher Lp(a) levels in patients with aortic stenosis [214(67–501) mg/L vs 104(56–169) mg/L, p = 0.043] were also found. In conclusion, present data suggest the potential role for Lp(a) as a possible risk marker useful to stratify, among BAV patients, those with a higher chance to develop valvular calcifications and aortic stenosis.

Original languageEnglish
JournalInternal and Emergency Medicine
DOIs
Publication statusE-pub ahead of print - Aug 1 2018

Keywords

  • Bicuspid aortic valve
  • Calcification
  • Kringle IV type 2
  • Lipoprotein (a)
  • Stenosis

ASJC Scopus subject areas

  • Internal Medicine
  • Emergency Medicine

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