An immunoturbidimetric assay for bovine haptoglobin

Nicola Brady, Emily L O'Reilly, Christopher McComb , Alastair Macrae, P David Eckersall

Research output: Contribution to journalArticlepeer-review

Abstract

In cattle the serum protein haptoglobin (Hp) is a major acute phase proteins (APP) that rises in concentration over a thousand following stimulation by proinflammatory cytokines. As such this APP is a valuable biomarker for infection, inflammation and trauma in cattle. The assay for bovine Hp is
becoming more commonplace in clinical pathology and in experimental studies when a biomarker of innate immunity is required. The most widely used assay for Hp utilises its binding to haemoglobin (Hp-Hb binding assay), which at low pH enables the preservation of the native peroxidase activity in the haemoglobin. This assay is used for all species, including species such as dog, cat and pig where the level of Hp is higher in healthy animals of these species than in healthy cattle, a bovine specific immunoassay that can be automated would be desirable. Thus a novel automated species specific immunoturbidimetric (IT) assay has been developed. Validation studies showed intra and inter assay CVs of below 5% and 9% respectively and a recovery of 99% from samples spiked with bovine Hp and a limit of quantification of 0.033 g/L. The assay as not affected by icterus or lipaemia but had moderate interference from haemoglobin and showed a significant correlation with the Hp-Hb binding
assay. This novel IT assay for bovine Hp will allow automated analysis of this important bovine APP for to identify low level changes in the Hp concentration not detectable by current Hb binding assays. It will enable the incorporation of this assay into herd health assessments, animal welfare analysis and for bovine medicine and research.
Original languageEnglish
JournalComparative Clinical Pathology
Early online date14 Nov 2018
Publication statusE-pub ahead of print - 14 Nov 2018

Keywords

  • acute phase
  • haptoglobin
  • cattle
  • immunoturbidimetric

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