Journal: Ultrasound in medicine & biology
Article Title: Accelerated clearance of ultrasound contrast agents containing polyethylene glycol is associated with the generation of anti-polyethylene glycol antibodies
doi: 10.1016/j.ultrasmedbio.2018.02.006
Figure Lengend Snippet: Quantification of serum anti-PEG antibody levels and results of a competitive ELISA using free mPEG-DSPE (experiment 1). (A) Serum anti-PEG IgG is shown to peak 7–14 d after the initial dose of house-MBs and decrease by the 28-d time point. (B) Serum anti-PEG IgM is shown to peak on day 7 for multiple and single dose groups. Anti-PEG IgM was found to decrease at subsequent time points. C and D) For those samples showing high anti-PEG IgM or anti-PEG IgG antibody expression, a competitive ELISA assay was performed to confirm PEG specificity. IgM and IgG binding to the PEG-coated ELISA plate was shown to decrease substantially when serum was incubated in the presence of free mPEG-DSPE (0.9–0.99 mg/ml). * p ≤ 0.05; ** p ≤ 0.01; **** p ≤ 0.0001. ELISA = enzyme-linked immunosorbent assay, Ig = immunoglobulin, DSPE-mPEG2000 = 1,2,-distearoyl-sn-glycero-3-phosphoethanolamine-N-methoxy(polyethylene-glycol)-2000.
Article Snippet: Serum concentrations of anti-PEG IgM or anti-PEG IgG antibodies were analyzed separately using their respective enzyme-linked immunosorbent assay (ELISA) kits (Life Diagnostics, Inc., West Chester, PA, USA) performed according to the manufacturer’s protocol.
Techniques: Competitive ELISA, Expressing, Binding Assay, Enzyme-linked Immunosorbent Assay, Incubation