Résumé
Parallèlement à sa fonction de stockage et de mobilisation de lipides, le tissu adipeux (TA) sécrète de nombreuses molécules bioactives (peptides, glycoprotéines, acides gras et leurs dérivés, phospholipides), nommées «adipokines» et qui sont de plus en plus suspectées de participer à la régulation de la balance énergétique et à l’étiologie des pathologies associées à l’obésité (diabète, hypertension, athérosclérose…). À notre avis, l’utilisation du terme «adipokines» devrait être débattue. Il provient de la contraction d’adipocytokines, dans lequel «cyto-» (cellule) et «-kinos» (mouvement) donnent cytokines, correspondant à une classe de petites molécules sécrétées par les cellules immunitaires (lymphocytes, macrophages, cellules gliales…) et agissant à distance. Les cytokines ont une fonction de messager, elles sont généralement peu abondantes dans le sang en situation normale, mais leur concentration augmente très fortement en conditions traumatiques ou en cas d’infection. Au regard de ces définitions, peu d’adipokines semblent pouvoir être considérées comme des cytokines. Néanmoins, comme les cytokines, l’activité biologique des «adipokines» s’exerce de façon locale (paracrine, autocrine) ou par voie systémique (endocrine). Initialement les adipokines étaient considérées comme des molécules sécrétées uniquement par le TA. Cette notio est d’ores et déjà obsolète car, outre la leptine et l’adiponectine, la grande majorité des adipokines sont également produites par d’autres organes.
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Carpéné, C., Saulnier-Blache, JS. (2013). Quelques nouvelles des «adipocrines». In: Physiologie et physiopathologie du tissu adipeux. Springer, Paris. https://doi.org/10.1007/978-2-8178-0332-6_15
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DOI: https://doi.org/10.1007/978-2-8178-0332-6_15
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