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Journal of Physiology and Biochemistry

, Volume 75, Issue 3, pp 263–273 | Cite as

Effects of the amino acid derivatives, β-hydroxy-β-methylbutyrate, taurine, and N-methyltyramine, on triacylglycerol breakdown in fat cells

  • Mélanie Leroux
  • Tristan Lemery
  • Nathalie Boulet
  • Anaïs Briot
  • Alexia Zakaroff
  • Anne Bouloumié
  • Fernando Andrade
  • Patricia Pérez-Matute
  • Jose M. Arbones-Mainar
  • Christian CarpénéEmail author
Original Article
  • 125 Downloads

Abstract

Various amino acid (AA) metabolites are used as supplements to facilitate metabolic control and enhance responsiveness of insulin-sensitive tissues. β-hydroxy-β-methylbutyrate (HMB) is a leucine metabolite proposed to prevent muscle wasting and to mitigate insulin resistance. Taurine, commonly added to energizing drinks, is a metabolite of methionine and cysteine present in bile juice, and proposed to be involved in lipid digestion and to be pro-lipolytic in adipocytes. N-methyltyramine (NMT) is a phenylalanine metabolite found in orange juices at 0.1–3 ppm while its effects on lipid mobilization remain controversial. Here, the putative lipolytic effects of these AA metabolites were studied and it was tested whether they could enhance insulin antilipolytic response in adipocytes. Release of glycerol and non-esterified fatty acids (NEFAs) was measured after a 2-h incubation of adipocytes obtained from control and diet-induced obese mice or from obese patients. In mouse, none of the tested AA derivatives was lipolytic from 1 μM to 1 mM. These compounds did not improve insulin antilipolytic effect or isoprenaline lipolytic action, except for 1 mM NMT that impaired triacylglycerol breakdown in obese mice. In human adipocytes, HMB and taurine were not lipolytic, while NMT weakly activated glycerol and NEFA release at 1 mM. However, 100 μM NMT impaired isoprenaline-stimulated lipolysis in a manner that was hardly added to insulin antilipolytic effect. Since none of these AA derivatives acutely helped or replaced insulin antilipolytic effect in adipocytes, the present in vitro observations do not support their proposed insulin-sensitizing properties. Moreover, NMT, HMB, and taurine were not notably lipolytic.

Keywords

Adipose tissue Human Insulin resistance Lipolysis Branched-chain amino acids 

Notes

Acknowledgements

The authors are grateful to all the other participants of the HEPATIC/Refbio2 project and to the members of CTPIOD mini-network (http://obesitydiabetesinctp.weebly.com) for helpful discussions. All our thanks to Dr. Jean Galitzky, to Jean Jérôme Soueix (I2MC, Toulouse, France), and to Pr. Jean Louis Grolleau (Chirurgie plastique et des brulés, CHU Rangueil, Toulouse, France) for facilitating access to laboratory devices, networking, and to human surgical pieces, respectively.

Funding information

This study was partly supported by recurrent INSERM funds and by FEDER funding via grants of the French-Spanish HEPATIC/Refbio2 project.

Compliance with ethical standards

All animal procedures complied with the principles established by the Institut National de la Santé et de la Recherche Médicale (INSERM, France) according to the Protocol Permission Number 12-1048-03-15 (on the 20/03/2012) and were approved by the local Ethics Committee of US006 CREFRE (Centre Régional d’Exploration Fonctionnelle et Ressources Expérimentales, Toulouse, France). All individuals gave their informed consent for their participation to the study as validated by the local ethic committee for the protection of individuals under the reference Comité de Protection des Personnes Sud Ouest et Outre Mer II, DC-2008-452.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© University of Navarra 2019

Authors and Affiliations

  • Mélanie Leroux
    • 1
    • 2
  • Tristan Lemery
    • 1
    • 2
  • Nathalie Boulet
    • 1
    • 2
  • Anaïs Briot
    • 1
    • 2
  • Alexia Zakaroff
    • 1
    • 2
  • Anne Bouloumié
    • 1
    • 2
  • Fernando Andrade
    • 3
  • Patricia Pérez-Matute
    • 4
  • Jose M. Arbones-Mainar
    • 5
  • Christian Carpéné
    • 1
    • 2
    Email author
  1. 1.Institute of Metabolic and Cardiovascular Diseases, INSERMToulouse cedex 4France
  2. 2.University of ToulousePaul Sabatier UniversityToulouseFrance
  3. 3.Metabolomics Platform, BioCruces Bizkaia Health Research Institute, linked clinical group of Rare Diseases CIBER (CIBERER)BarakaldoSpain
  4. 4.Infectious Diseases DepartmentCenter for Biomedical Research of La Rioja (CIBIR)LogroñoSpain
  5. 5.Adipocyte and Fat Biology LaboratoryInstituto Aragonés de Ciencias de la Salud (IACS), Instituto de Investigación Sanitaria (IIS) Aragón. Zaragoza, Spain. CIBER Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto Salud Carlos IIIMadridSpain

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