title: Prevalence of beta-2 adrenergic receptor (beta 2 AR) polymorphisms and its influence on a model used to assess endothelial function using pulse wave analysis (PWA).
abstract: BACKGROUND
  Pulse wave analysis (PWA) combined with beta(2)-agonist challenge has recently been used to assess endothelial function. beta-2 adrenergic receptor (beta(2)AR) polymorphisms may affect response to beta(2)-agonist. We determined whether beta(2)AR polymorphisms influence endothelial response in our model using PWA and salbutamol.
  
  
  METHODS
  388 healthy Malay subjects (177 males, 211 females) were genotyped for 5 functionally important single nucleotide polymorphisms (SNPs) of beta(2)AR; 298 subjects proceeded with assessment of endothelial function. The parameter augmentation index (AIx) was recorded non-invasively using SphygmoCor. Recording of AIx at baseline was followed by administration of 500 microg sublingual glyceryl trinitrate (GTN). AIx recordings were repeated at 3, 5, 10, 15 and 20 min post-GTN. Subjects then inhaled 400 microg of salbutamol before AIx recordings at 5 min intervals up to 20 min. Maximum changes in AIx after GTN and salbutamol represented endothelium independent and endothelium dependent vasodilatation (EDV) respectively.
  
  
  RESULTS
  Allele frequencies of mutated Gly16, Glu27, Ile164, -20C and -47C were 47%, 6.8%, 0%, 30% and 9.3% respectively. No significant differences in EDV were noted between genotype groups of each studied SNPs.
  
  
  CONCLUSIONS
  Assessment of endothelial function using PWA and salbutamol was not influenced by beta(2)AR polymorphisms.
authors.affiliation: Department of Pharmacology, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia. izah@kck.usm.my
authors.forename: Nik Nor Izah Nik
authors.initials: NN
authors.lastname: Ibrahim
authors.forename: Aida Hanum Ghulam
authors.initials: AH
authors.lastname: Rasool
authors.forename: Abdul Rahim
authors.initials: AR
authors.lastname: Wong
authors.forename: Abdul Rashid Abdul
authors.initials: AR
authors.lastname: Rahman
mesh_terms: D000293:Adolescent; D000328:Adult; D000420:Albuterol / Q000008:administration & dosage / Q000494:pharmacology; D004727:Endothelium / Q000187:drug effects / Q000502:physiology*; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics*; D055815:Young Adult
chemical_list: D018343:Receptors, Adrenergic, beta-2; D000420:Albuterol