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Toward elucidation of dioxin-mediated chloracne and Ah receptor functions

Karl Walter Bock1

  • 1Department of Toxicology, Institute of Experimental and Clinical Pharmacology and Toxicology, Wilhelmstrasse 56, D-72074 Tübingen, Germany.

Biochemical Pharmacology
|January 24, 2016
PubMed

Insights

Dioxin (TCDD) activates the aryl hydrocarbon receptor (AhR) in sebaceous gland stem cells, causing chloracne by disrupting cell differentiation and promoting apoptosis. This research identifies key molecular targets for dioxin toxicity.

Area of Science:

  • Toxicology
  • Dermatology
  • Molecular Biology
  • Stem Cell Biology

Background:

  • Chloracne is the primary indicator of dioxin toxicity, necessitating a clear understanding of its underlying mechanisms.
  • The aryl hydrocarbon receptor (AhR) is a critical mediator of dioxin's toxic effects.
  • Sebaceous glands and their stem/progenitor cells are implicated in dioxin-induced skin conditions.

Purpose of the Study:

  • To identify the specific target cells and molecular pathways involved in dioxin-mediated chloracne.
  • To elucidate the role of the aryl hydrocarbon receptor (AhR) in the pathogenesis of chloracne.
  • To investigate the interaction of AhR with other transcription factors in sebaceous gland stem/progenitor cells.

Main Methods:

  • Review of existing literature on dioxin toxicity, chloracne, and molecular targets.
  • Analysis of the role of the aryl hydrocarbon receptor (AhR) in sebaceous gland stem/progenitor cells.
  • Examination of the interplay between AhR, c-Myc, Blimp1, and ß-Catenin/TCF signaling pathways.
  • In vitro studies using the SZ95 sebocyte stem/progenitor cell line to assess TCDD effects.

Main Results:

  • Tetrachlorodibenzo-p-dioxin (TCDD) accumulates in sebum, persistently activating the AhR in sebaceous gland stem/progenitor cells.
  • AhR activation, in conjunction with transcription factors like c-Myc, Blimp1, and ß-Catenin/TCF, disrupts normal sebocyte differentiation.
  • TCDD induces Blimp1 expression, leading to sebocyte apoptosis and increased proliferation of interfollicular epidermis cells.
  • These molecular events explain clinical observations of chloracne in individuals exposed to TCDD.

Conclusions:

  • The study identifies sebaceous gland stem/progenitor cells as key targets for dioxin-induced chloracne.
  • Molecular targets include the AhR and associated transcription factors (c-Myc, Blimp1, ß-Catenin/TCF).
  • AhR function is context-dependent within specific cell types, offering insights into its homeostatic roles in stem cells.
Keywords:
2,3,7,8-Tetrachlorodibenzo-p-dioxin=TCDD (PubChem CID 15625)6-Formylindolo[3,2-b]carbazole=FICZ (PubChem CID 1863)Ah receptorBlimp1ChloracneSebocyte stem/progenitor cellsTCDD

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