Cited by 51Per- and polyfluoroalkyl substances researchImmunotoxicology and immune responsesEnvironmental Toxicology and Ecotoxicology

Internal Relative Potency Factors Based on Immunotoxicity for the Risk Assessment of Mixtures of Per- and Polyfluoroalkyl Substances (PFAS) in Human Biomonitoring

Open access
Bil, Wieneke, Ehrlich, Veronika, Chen, Guangchao, Vandebriel, Rob, Zeilmaker, Marco, Luijten, Mirjam, Uhl, Maria, Marx-Stoelting, Philip +2 more·2023·Environment International

Abstract

Relative potency factors (RPFs) for per- and polyfluoroalkyl substances (PFAS) have previously been derived based on liver effects in rodents for the purpose of performing mixture risk assessment with primary input from biomonitoring studies. However, in 2020, EFSA established a tolerable weekly intake for four PFAS assuming equal toxic potency for immune suppressive effects in humans. In this study we explored the possibility of deriving RPFs for immune suppressive effects using available data in rodents and humans. Lymphoid organ weights, differential blood cell counts, and clinical chemistry from 28-day studies in male rats from the National Toxicology Program (NTP) were combined with modeled serum PFAS concentrations to derive internal RPFs by applying dose-response modelling. Identified functional studies used diverse protocols and were not suitable for derivation of RPFs but were used to support immunotoxicity of PFAS in a qualitative manner. Furthermore, a novel approach was used to estimate internal RPFs based on epidemiological data by dose-response curve fitting optimization, looking at serum antibody concentrations and key cell populations from the National Health and Nutrition Examination Survey (NHANES). Internal RPFs were successfully derived for PFAS based on rat thymus weight, spleen weight, and globulin concentration. The available dose-response information for blood cell counts did not show a significant trend. Immunotoxic potency in serum was determined in the order PFDA > PFNA > PFHxA > PFOS > PFBS > PFOA > PFHxS. The epidemiological data showed inverse associations for the sum of PFOA, PFNA, PFHxS, and PFOS with serum antibody concentrations to mumps and rubella, but the data did not allow for deduction of reliable internal RPF estimates. The internal RPFs for PFAS based on decreased rat lymphoid organ weights are similar to those previously established for increased rat liver weight, strengthening the confidence in the overall applicability of these RPFs.

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Crossref · 10.1016/j.envint.2022.107727

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  • Recent studies did not modify the limitation of using rodent parameters to establish TEFs that are intended to be used to estimate human health risks related to PFAS mixtures exposure.

    “Recent studies did not modify the limitation of using rodent parameters to establish TEFs that are intended to be used to estimate human health risks related to PFAS mixtures exposure.”

    From The EU’s Per- and Polyfluoroalkyl Substances (PFAS) Ban: A Case of Policy over Science (2023) · cites this paper as [50]

    The Introduction says earlier PFAS potency factors were derived from rat liver effects for use with human biomonitoring data. The Conclusion reports that this study derived factors from rat immune measures, while its human epidemiological data could not yield reliable estimates. This supports the point that reliance on rodent data persisted, but the paper calls these factors RPFs, not TEFs, and does not explicitly characterize that reliance as a limitation. (LLM, conf=0.85)

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  • A more recent study aimed to establish RPFs for the immune suppressive effects of PFAS using rodent and human data; RPFs were successfully derived for PFAS based on rat lymphoid organ weights and globulin concentration; seven PFAS were ranked for immunotoxic potency; epidemiological data indicated inverse associations of the sum of PFOA, PFNA, PFHxS, and PFOS concentration with serum antibody浓度 to

    “A more recent study aimed to establish RPFs for the immune suppressive effects of PFAS using rodent and human data. RPFs were successfully derived for PFAS based on rat lymphoid organ weights and globulin concentration. Seven PFAS were ranked for immunotoxic potency. Epidemiological data indicated inverse associations of the sum of PFOA, PFNA, PFHxS, and PFOS concentration with serum antibody”

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Authors
Bil, W., Ehrlich, V., Chen, G., Vandebriel, R., Zeilmaker, M., Luijten, M., Uhl, M., Marx-Stoelting, P., Halldorsson, T. I., & Bokkers, B.
Affiliations
  • National Institute for Public Health and the Environment (NL)
  • Environment Agency Austria (AT)
  • Statens Serum Institut (DK)
Corresponding author
Bil, Wieneke
Venue
Environment International
Publisher
Elsevier BV
Published
2023-01
Volume
171
Pages
107727
ISSN
0160-4120 (ISSN-L)
OpenAlex
W4313594148
Cited by
51
References
81
Citations by year
2026: 14 · 2025: 11 · 2024: 17 · 2023: 9
FWCI
4.39
Type
journal article
Language
en
Open access
Locations
  • Environment International (publishedVersion, cc-by-nc-nd)
  • SSRN Electronic Journal (acceptedVersion)
  • PubMed (publishedVersion)
  • Opin vísindi (Opin vísindi) (submittedVersion, cc-by-nc-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Opin vísindi (Opin vísindi) (submittedVersion, other-oa)
  • Rivm (National Institute for Public Health and the Environment) (submittedVersion)
Funders
  • National Institute for Public Health and the Environment
  • Horizon 2020 Framework Programme
  • Horizon 2020 (733032 HBM4EU)
  • European Commission
  • European Environment Agency
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotoxicology and immune responses
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
Keywords
per- and polyfluoroalkyl substances, PFAS, relative potency factors, immunotoxicity, mixture risk assessment, human biomonitoring, dose-response modeling, lymphoid organ weight, serum globulin, serum antibody concentration, perfluorooctanoic acid, PFOS, PFNA, PFHxS, tolerable weekly intake, epidemiological data
MeSH terms
Biological Monitoring, Animals, Environmental Pollutants, Fluorocarbons, Humans, Liver, Male, Nutrition Surveys, Alkanesulfonic Acids, Rats

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