What is it about?

This study investigated how low nanomolar concentrations of perfluorononanoic acid (PFNA), a persistent PFAS compound, affect the development and function of 3T3-L1 adipocytes. The researchers found that exposure during the proliferative preadipocyte stage was particularly impactful, leading to long-lasting cellular alterations that persisted after differentiation. PFNA exposure induced a senescence-like phenotype, increased markers of endoplasmic reticulum (ER) stress, promoted adipogenesis, and enhanced pro-inflammatory signaling. Pharmacological inhibition of ER stress with tauroursodeoxycholic acid (TUDCA) markedly reduced these effects.

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Why is it important?

The findings highlight the proliferative preadipocyte phase as a sensitive window during which low-level PFNA exposure can trigger persistent cellular dysfunction. The study identifies ER stress as a key upstream mechanism linking PFNA exposure to subsequent senescence-like, adipogenic, oxidative, and inflammatory alterations in adipocytes. These results contribute to understanding how persistent environmental contaminants may affect adipose tissue biology and metabolic processes.

Perspectives

This work was conducted in a cellular model and therefore does not directly demonstrate health effects in humans. However, it provides important mechanistic insights into how exposure timing may influence the biological impact of PFNA. Future studies in more complex experimental systems will be needed to determine the relevance of these mechanisms in vivo and to better understand the long-term metabolic consequences of chronic low-level PFNA exposure.

Prof. Antonio Speciale
University of Messina

Read the Original

This page is a summary of: Endoplasmic reticulum stress coordinates perfluorononanoic acid (PFNA)-induced dysfunction in murine preadipocytes, Toxicology, January 2027, Elsevier,
DOI: 10.1016/j.tox.2026.154617.
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