title: The relationship between plasma angiopoietin-like protein 4 levels, angiopoietin-like protein 4 genotype, and coronary heart disease risk.
abstract: OBJECTIVE
  To investigate the relationship between angiopoietin-like protein 4 (Angptl4) levels, coronary heart disease (CHD) biomarkers, and ANGPTL4 variants.
  
  
  RESULTS
  Plasma Angptl4 was quantified in 666 subjects of the Northwick Park Heart Study II using a validated ELISA. Seven ANGPTL4 single-nucleotide polymorphisms were genotyped, and CHD biomarkers were assessed in the whole cohort (N=2775). Weighted mean±SD plasma Angptl4 levels were 10.0±11.0 ng/mL. Plasma Angptl4 concentration correlated positively with age (r=0.15, P<0.001) and body fat mass (r=0.19, P=0.003) but negatively with plasma high-density lipoprotein cholesterol (r=-0.13, P=0.01). No correlation with triglycerides (TGs) was observed. T266M was independently associated with plasma Angptl4 levels (P<0.001) but was not associated with TGs or CHD risk in the meta-analysis of 5 studies (4061 cases/15 395 controls). E40K showed no independent association with plasma Angptl4 levels. In human embryonic kidney 293 and human hepatoma 7 cells compared with wild type, E40K and T266M showed significantly altered synthesis and secretion, respectively.
  
  
  CONCLUSIONS
  Circulating Angptl4 levels may not influence TG levels or CHD risk for the following reasons: (1) Angptl4 levels were not correlated with TGs; (2) T266M, although associated with Angptl4 levels, showed no association with plasma TGs; and (3) TG-lowering E40K did not influence Angptl4 levels. These results provide new insights into the role of Angptl4 in TG metabolism.
authors.affiliation: Centre for Cardiovascular Genetics, University College London, 5 University St, London WC1E 6JF, England. m.smart@ucl.ac.uk
authors.forename: Melissa C
authors.initials: MC
authors.lastname: Smart-Halajko
authors.forename: Marius R
authors.initials: MR
authors.lastname: Robciuc
authors.forename: Jackie A
authors.initials: JA
authors.lastname: Cooper
authors.forename: Matti
authors.initials: M
authors.lastname: Jauhiainen
authors.forename: Meena
authors.initials: M
authors.lastname: Kumari
authors.forename: Mika
authors.initials: M
authors.lastname: Kivimaki
authors.forename: Kay-Tee
authors.initials: KT
authors.lastname: Khaw
authors.forename: S Matthijs
authors.initials: SM
authors.lastname: Boekholdt
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Wareham
authors.forename: Tom R
authors.initials: TR
authors.lastname: Gaunt
authors.forename: Ian N
authors.initials: IN
authors.lastname: Day
authors.forename: Peter S
authors.initials: PS
authors.lastname: Braund
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Nelson
authors.forename: Alistair S
authors.initials: AS
authors.lastname: Hall
authors.forename: Nilesh J
authors.initials: NJ
authors.lastname: Samani
authors.forename: Steve E
authors.initials: SE
authors.lastname: Humphries
authors.forename: Christian
authors.initials: C
authors.lastname: Ehnholm
authors.forename: Philippa J
authors.initials: PJ
authors.lastname: Talmud
mesh_terms: D000075803:Angiopoietin-Like Protein 4; D042682:Angiopoietins / Q000097:blood / Q000235:genetics*; D015415:Biomarkers / Q000097:blood; D002460:Cell Line; D003324:Coronary Artery Disease / Q000097:blood / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors
chemical_list: C474772:ANGPTL4 protein, human; D000075803:Angiopoietin-Like Protein 4; D042682:Angiopoietins; D015415:Biomarkers