PPAR gamma 2 prevents lipotoxicity by controlling adipose tissue expandability and peripheral lipid metabolism

G. Medina-Gomez, S.L. Gray, Laxman Yetukuri, K. Shimomura, M. Campbell, K. Curtis, S. Virtue, M. Jimenez-Linan, M. Blount, G.S.H. Yeo, M. Lopez, Tuulikki Seppänen-Laakso, F.M. Ashcroft, Matej Oresic, A. Vidal-Puig

    Research output: Contribution to journalArticleScientificpeer-review

    300 Citations (Scopus)

    Abstract

    Peroxisome proliferator activated receptor gamma 2 (PPARg2) is the nutritionally regulated isoform of PPARg.
    Ablation of PPARg2 in the ob/ob background, PPARg2−/− Lepob/Lepob (POKO mouse), resulted in decreased fat mass, severe insulin resistance, β-cell failure, and dyslipidaemia.
    Our results indicate that the PPARg2 isoform plays an important role, mediating adipose tissue expansion in response to positive energy balance. Lipidomic analyses suggest that PPARg2 plays an important antilipotoxic role when induced ectopically in liver and muscle by facilitating deposition of fat as relatively harmless triacylglycerol species and thus preventing accumulation of reactive lipid species.
    Our data also indicate that PPARg2 may be required for the β-cell hypertrophic adaptive response to insulin resistance. In summary, the PPARg2 isoform prevents lipotoxicity by (a) promoting adipose tissue expansion, (b) increasing the lipid-buffering capacity of peripheral organs, and (c) facilitating the adaptive proliferative response of β-cells to insulin resistance.
    Original languageEnglish
    Article numbere64
    Number of pages14
    JournalPLoS Genetics
    Volume3
    Issue number4
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

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