Intra- and inter-laboratory validation of an innovative huFcεRIα-RBL-2H3 degranulation assay for in vitro allergenicity assessment of whey hydrolysates

Authors Marjan Gros , Linda Cox , Johan Garssen , Niels de Jong , Diana Kegler , Reiko Teshima , Peter J. Simons , Laura Kruijssen , Manon van Roest , Raymond Pieters , Léon M.J. Knippels , Mieke Smits , Marc Teunis , Karen Knipping , Louis Boon
Published in Toxicology in vitro
Publication date 24 February 2016
Research groups Innovative Testing in Life Sciences and Chemistry
Type Article

Summary

from the article: "Cow's milk-derived whey hydrolysates are milk substitutes for cow's milk allergic infants. Safety assessment of these hydrolysates is crucial. Currently, huFcεRIα-RBL-2H3 cells, sensitized with serum IgE from cow's milk allergic patients, are used to assess in vitro residual allergenicity. However, limited availability and high inter-lot variation of sera impede the standardization of safety testing. Recently, we generated an oligoclonal pool of chimeric human (chu)IgE antibodies against bovine β-lactoglobulin (BLG) as an alternative for human serum. These antibodies demonstrated increased sensitivity, specificity and reproducibility. An inter-laboratory ring trial using our new degranulation assay with different whey-based hydrolysates was performed at four independent laboratories to investigate the robustness and reproducibility. RBL-2H3 cells expressing huFcεRIα were sensitized with our oligoclonal pool of anti-BLG chuIgE antibodies. The cells were subsequently incubated with an amino-acid based formula (AAF), two extensively hydrolyzed formulas (eHF) and three partially hydrolyzed formulas (pHF) to assess the degranulation upon challenge. Results demonstrated a very strong inter-laboratory correlation and the intra- and inter-laboratory variations were acceptable. The AAF and both eHFs showed no degranulation, whereas all pHFs demonstrated degranulation. The study showed that this degranulation assay is robust and reproducible within and between laboratories. This new in vitro degranulation assay seems predictive for allergenicity outcome and might therefore be considered as a relevant substitute for animal models."

researchcomponents.publicationcontent.personslist.publicationauthors

  • Raymond Pieters | Professor | Research group Innovative Testing in Life Sciences & Chemistry
    Raymond Pieters
    • Professor
    • Research groups: Innovative Testing in Life Sciences and Chemistry
  • Mieke Smits | Researcher | Research group Innovative Testing in Life Sciences and Chemistry
    Mieke Smits
    • Researcher
    • Research groups: Innovative Testing in Life Sciences and Chemistry
  • Marc Teunis | Researcher | Research group Innovative Testing in Life Sciences and Chemistry
    Marc Teunis
    • Researcher
    • Research groups: Innovative Testing in Life Sciences and Chemistry

Language English
Published in Toxicology in vitro
Year and volume 33 June
Key words Medicine
Page range 29-34

Innovative Testing in Life Sciences and Chemistry