Abstract
Bakground/Objectives:
Intense drug discovery efforts in the metabolic field highlight the need for novel strategies for the treatment of obesity. Alternative splicing (AS) and/or polyadenylation enable the LMNA gene to express distinct protein isoforms that exert opposing effects on energy metabolism and lifespan. Here we aimed to use the splicing factor SRSF1 that contribute to the production of these different isoforms as a target to uncover new anti-obesity drug.
Subjects/Methods:
Small molecules modulating SR protein activity and splicing were tested for their abilities to interact with SRSF1 and to modulate LMNA (AS). Using an LMNA luciferase reporter we selected molecules that were tested in diet-induced obese (DIO) mice. Transcriptomic analyses were performed in the white adipose tissues from untreated and treated DIO mice and mice fed a chow diet.
Results:
We identified a small molecule that specifically interacted with the RS domain of SRSF1. ABX300 abolished DIO in mice, leading to restoration of adipose tissue homeostasis. In contrast, ABX300 had no effect on mice fed a standard chow diet. A global transcriptomic analysis revealed similar profiles of white adipose tissue from DIO mice treated with ABX300 and from untreated mice fed a chow diet. Mice treated with ABX300 exhibited an increase in O2 consumption and a switch in fuel preference toward lipids.
Conclusions:
Targeting SRSF1 with ABX300 compensates for changes in RNA biogenesis induced by fat accumulation and consequently represents a novel unexplored approach for the treatment of obesity.
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Acknowledgements
We are grateful to the Montpellier-RIO imaging platform (Montpellier, France), the Histology Experimental Network of Montpellier and the IGMM animal facilities. We are grateful to Roscoe Klinck (Université de Sherbrooke), Pierre de la Grange (Genosplice) and Edouard Bertrand for the SRSF1-GFP HeLa cells. The screening reported in this paper was performed within the France-BioImaging national research infrastructure, at MRI, Montpellier. France-BioImaging is supported by the French National Research Agency through the ‘Investments for the Future’ program (ANR-10-INSB-04). We thank Julien Bellis, Sylvain de Rossi and Virginie Georget for conducting the screening and microscopy imaging. We thank also Laurie Gayte for her help during the in vivo experiments This work was supported by the collaborative laboratory ABIVAX, OSEO-ISI CaReNA grant and Fondation pour la Recherche Médicale (FRM) grant (Equipe FRM 2011—no. DEQ20111223745). JT is a senior member of the Institut Universitaire de France. CLH is an ESR fellow of the EU FP7 Marie Curie ITN RNPnet program (289007). ICLM was supported by a graduate fellowship from the Ministère Délégué à la Recherche et aux Technologies and CNRS.
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Santo, J., Lopez-Herrera, C., Apolit, C. et al. Pharmacological modulation of LMNA SRSF1-dependent splicing abrogates diet-induced obesity in mice. Int J Obes 41, 390–401 (2017). https://doi.org/10.1038/ijo.2016.220
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DOI: https://doi.org/10.1038/ijo.2016.220
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