title: A rapid and sensitive method for EphB4 identification as a diagnostic and therapeutic biomarker in invasive breast cancer.
abstract: BACKGROUND
  In the roadmap to design diagnostic and therapeutic markers for breast cancer, EphB4 is of special interest due to its multiple roles in tumor initiation, progression and invasion. The aim of present study was to characterize a rapid and sensitive ELISA-based method to measure EphB4 level and its phosphorylation status following stimulation with its ligand, ephrinB2, in an invasive breast cancer cell line.
  
  
  METHODS
  MDA-MB-231 breast cancer cells were lysed and EphB4 level was measured using ELISA. EphB4 level was measured in sub- and post-confluent states in culture dishes. Receptor phosphorylation was also detected by ELISA assay, using various concentrations of pre-clustered ephrinB2 for 20 minutes.
  
  
  RESULTS
  Expression of EphB4 receptor was detected by ELISA in all samples. EphB4 level was significantly higher in post.confluent than sub.confluent cells. Phosphorylated receptor was also detectable with this method when cells were exogenously stimulated.
  
  
  CONCLUSIONS
  Quantitative data from ELISA manifested a difference between levels of EphB4 in two states of different invasive properties. Moreover, ELISA method may be considered rapid and sensitive enough to detect even low levels of total and phosphorylated EphB4 Cost-effectiveness of this method for the detection of differential expression of EphB4 proteins in clinics is also noticeable.
authors.forename: Mona
authors.initials: M
authors.lastname: Moshayedi
authors.forename: Farnaz
authors.initials: F
authors.lastname: Barneh
authors.forename: Shaghayegh
authors.initials: S
authors.lastname: Haghjooy-Javanmard
authors.forename: Hamid Mirmohammad
authors.initials: HM
authors.lastname: Sadeghi
authors.forename: Nahid
authors.initials: N
authors.lastname: Eskandari
authors.affiliation: Isfahan Clinical Toxicology Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Sabzghabaee
mesh_terms: D014408:Biomarkers, Tumor / Q000096:biosynthesis* / Q000235:genetics; D001943:Breast Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000628:therapy; D045744:Cell Line, Tumor; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D006801:Humans; D009361:Neoplasm Invasiveness / Q000235:genetics; D036225:Receptor, EphB1 / Q000096:biosynthesis / Q000235:genetics; D036224:Receptor, EphB4 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D014408:Biomarkers, Tumor; D036225:Receptor, EphB1; D036224:Receptor, EphB4