Résumé
La gestion de l’énergie est une question cruciale pour les cellules et un stockage transitoire apparaît comme une stratégie adaptée pour pallier les périodes de privation nutritionnelle. à cet égard, toutes les cellules eucaryotes, de la levure aux cellules de mammifères, ont développé la capacité potentielle d’accumuler des lipides et de former des gouttelettes lipidiques en réponse à un afflux massif d’acides gras. Ces gouttelettes lipidiques contiennent des lipides neutres, qui constituent de très bons substrats pour stocker de l’énergie étant donné la structure hydrophobe de leur squelette et leur très grand nombre de carbones pouvant produire de l’ATP en grande quantité par oxydation mitochondriale. Par analogie aux granules de glycogène, qui constitue aussi une forme de stockage de l’énergie dérivée du glucose, les gouttelettes lipidiques ont longtemps été considérées comme des dépôts intracytoplasmiques inertes. Cependant, au cours de ces dernières années, notre connaissance de la biologie des gouttelettes s’est considérablement étoffée et, de simples réservoirs de lipides neutres, elles ont acquis le statut d’organelles dynamiques. De nombreuses revues récentes répertorient les nouvelles données sur ce sujet [1–4].
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Dugail, I., Le Lay, S. (2013). Physiologie de la gouttelette lipidique adipocytaire. In: Physiologie et physiopathologie du tissu adipeux. Springer, Paris. https://doi.org/10.1007/978-2-8178-0332-6_9
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