Detection by ELISA of C-terminal proBNP in plasma from cats with cardiomyopathy

Philip F. Solter, Mark A. Oyama, Maggie C. Machen, Dennis J. Trafny, D. David Sisson

Research output: Contribution to journalArticlepeer-review


The B-type natriuretic peptide prohormone (proBNP) is enzymatically cleaved into an inactive N-terminal peptide and a biologically active C-terminal peptide with many beneficial cardiorenal effects. The purpose of this study was to develop and test in cats with cardiomyopathy an immunoassay to quantify the concentrations of C-terminal proBNP in feline plasma.An anti-canine proBNP monoclonal antibody (UI-1021) was shown to have adequate binding affinity to proBNP 80-106 for use in a solid-phase immunoassay, and by epitope mapping to bind within positions 84-87 of feline proBNP. UI-1021 was paired with an affinity-purified rabbit polyclonal detection antibody to feline proBNP 100-106, in a sandwich ELISA with feline proBNP 80-106 standard. The linearity and analytical range and sensitivity of the assay were confirmed from 1.4 to 85 pmol/L. Spike recovery averaged 106.5% (95% confidence interval 78-135%). Within run and intra-assay coefficients of variation were <12%. A protease inhibitor mixture preserved proBNP 80-106 immunoreactivity for at least 5 days in plasma. Clinical verification of the ELISA was done using plasma from 13 cats with cardiomyopathy, whose C-terminal proBNP concentrations ranged from 1.7 to 78.8 pmol/L vs. <1.4-1.8 pmol/L in plasma from 18 healthy cats.Concentrations were found to be substantially lower than reported N-terminal proBNP concentrations, and similar to those of human heart failure patients where relative C-terminal BNP deficiencies have been proposed as contributory to the progression of the disease.

Original languageEnglish (US)
Pages (from-to)213-217
Number of pages5
JournalVeterinary Journal
Issue number2
StatePublished - Nov 2015


  • B-type natriuretic peptide
  • Feline cardiomyopathy
  • Heart failure
  • Immunoassay
  • Natriuretic peptides

ASJC Scopus subject areas

  • Animal Science and Zoology
  • General Veterinary


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