Abstract
Multiple organs cooperate to regulate appetite, metabolism, and glucose and fatty acid homeostasis. Here, we identified and characterized lymphatic vasculature dysfunction as a cause of adult-onset obesity. We found that functional inactivation of a single allele of the homeobox gene Prox1 led to adult-onset obesity due to abnormal lymph leakage from mispatterned and ruptured lymphatic vessels. Prox1 heterozygous mice are a new model for adult-onset obesity and lymphatic vascular disease.
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Acknowledgements
We thank N. Gale for the LYVE-1 antibody and for discussions; M. Kahn for advice regarding the BODIPY FL C16 assay; M. Yanagisawa for the Tie2-Cre mice; R. Jandacek and P. Tso for the fatty acid absorption assay; M. Self for technical assistance; Y. Lee, A. Lavado and T. Nastasi for help with tissue dissections; M. Straign for the blood chemistry analysis; L. Mann and G. Murti for electron microscopy; G. Neale for help with microarray analysis; A. McArthur for editing the manuscript; B. Sosa-Pineda for discussions and critical reading of the manuscript; and D. Wasserman and G. Grosveld for discussions. This work was supported in part by a grant from the US National Institutes of Health to G.O., a Cancer Center Support Grant and the American Lebanese Syrian Associated Charities.
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Supplementary information
Supplementary Fig. 1
Expression of POMC, NPY, and CART is unaltered in the hypothalamus of adult Prox1+/− mice. (PDF 617 kb)
Supplementary Fig. 2
Metabolic features of Prox1-heterozygous mice and their wild-type counterparts. (PDF 241 kb)
Supplementary Fig. 3
Microarray analysis of muscle and adipose tissue from adult Prox1+/− and wild-type mice. (PDF 145 kb)
Supplementary Fig. 4
Prox1+/− mice exhibit alterations in directional lymph flow. (PDF 1692 kb)
Supplementary Fig. 5
Scheme of the Prox1 conditional knock-out construct. (PDF 129 kb)
Supplementary Table 1
Primer sequences used for RT-PCR amplification of the genes indicated from 3T3-L1 cells. (PDF 94 kb)
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Harvey, N., Srinivasan, R., Dillard, M. et al. Lymphatic vascular defects promoted by Prox1 haploinsufficiency cause adult-onset obesity. Nat Genet 37, 1072–1081 (2005). https://doi.org/10.1038/ng1642
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DOI: https://doi.org/10.1038/ng1642
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