N- And O-Acetylated 3-Iodothyronamines Have No Metabolic or Thermogenic Effects in Male Mice

Sogol Gachkar, Rebecca Oelkrug, Beate Herrmann, Thomas S. Scanlan, Qian Sun, Heike Biebermann, Carolin S. Hoefig, Lutz Schomburg, Jens Mittag

Research output: Contribution to journalArticle

Abstract

Introduction: Injection of 3-iodothyronamine into experimental animals profoundly affects their metabolism and body temperature. As 3-iodothyronamine is rapidly acetylated in vivo after injection, it was hypothesized that the metabolites N- or O-acetyl-3-iodothyronamines could constitute the active hormones. Methods: Adult male mice were injected once daily with one of the metabolites (5 mg/kg body weight intraperitoneally dissolved in 60% DMSO in PBS) or solvent. Metabolism was monitored by indirect calorimetry, body temperature by infrared thermography, and body composition by nuclear magnetic resonance analysis. Signaling activities in brown fat or liver were assessed by studying target gene transcription by qPCR including uncoupling protein 1 or deiodinase type 1 or 2, and Western blot. Results: The markers of metabolism, body composition, or temperature tested were similar in the mice injected with solvent and those injected with one of the acetylated 3-iodothyronamines. Conclusions: In our experimental setup, N- and O-acetyl-3-iodothyronamine do not constitute compounds contributing to the metabolic or temperature effects described for 3-iodothyronamine. The acetylation of 3-iodothyronamine observed in vivo may thus rather serve degradation and elimination purposes.

Original languageEnglish (US)
Pages (from-to)57-66
Number of pages10
JournalEuropean Thyroid Journal
Volume9
Issue number2
DOIs
StatePublished - Feb 1 2020

Keywords

  • Body temperature
  • Brown adipose tissue
  • Metabolism
  • Thermoregulation
  • Thyroid hormone
  • Thyronamines

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism

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    Gachkar, S., Oelkrug, R., Herrmann, B., Scanlan, T. S., Sun, Q., Biebermann, H., Hoefig, C. S., Schomburg, L., & Mittag, J. (2020). N- And O-Acetylated 3-Iodothyronamines Have No Metabolic or Thermogenic Effects in Male Mice. European Thyroid Journal, 9(2), 57-66. https://doi.org/10.1159/000504887