What is it about?
This study investigated how two p-phthalates—terephthalic acid (TPA) and dimethyl terephthalate (DMT), both used in the production of PET—affect murine 3T3‑L1 adipocytes when applied at concentrations relevant to human exposure. During adipocyte differentiation, both compounds increased lipid accumulation and upregulated key adipogenic markers (PPAR‑γ, C/EBPβ, FABP4, FASN), with DMT showing stronger effects. The adipogenic response, including PPAR‑γ induction, was reversed by ICI 182,780, an estrogen receptor antagonist. TPA and DMT also impaired the thermogenic program by reducing pAMPK and PGC‑1α levels and activated the NF‑κB pro-inflammatory pathway. These effects occurred at low nanomolar concentrations.
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Why is it important?
Humans have continuous and widespread contact with PET packaging, from food containers to beverage bottles. Under common environmental conditions (e.g., heat, pH shifts, irradiation), p‑phthalates can migrate into consumables. Demonstrating that TPA and DMT may promote adipogenesis, reduce thermogenic signaling, and induce inflammatory pathways highlights their potential relevance as endocrine-disrupting chemicals or obesogenic contaminants. Alterations in adipogenic and thermogenic balance are central to metabolic homeostasis. Even subtle shifts at low concentrations may contribute to adipocyte dysfunction, especially under chronic exposure scenarios typical of daily contact with plastics.
Perspectives
Additional mechanistic studies are needed to clarify how TPA and DMT influence adipocyte signaling networks, including estrogen receptor involvement, energy metabolism, and inflammatory responses. The current findings are based on in vitro data from 3T3‑L1 cells; therefore, in vivo confirmation and toxicokinetic analyses are essential to determine realistic exposure thresholds. Defining safe levels of TPA and DMT exposure remains a priority, given their extensive use in consumer products and the limited toxicological data available at environmentally relevant doses.
Prof. Antonio Speciale
University of Messina
Read the Original
This page is a summary of: The p-Phthalates Terephthalic Acid and Dimethyl Terephthalate Used in the Manufacture of PET Induce In Vitro Adipocytes Dysfunction by Altering Adipogenesis and Thermogenesis Mechanisms, Molecules, November 2022, MDPI AG,
DOI: 10.3390/molecules27217645.
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