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Reduced body weight in male Tspan8-deficient mice

International Journal of Obesity volume 35, pages 605–617 (2011)Cite this article

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Abstract

Objective:

The gene TSPAN8 was recently identified in a genome-wide association study as the most likely causal gene in a locus that was correlated with the risk of type 2 diabetes (T2D) in northern European individuals. To assess whether Tspan8 is the actual T2D-causal gene in this locus, we ablated its expression in mice and determined the consequences of this ablation on a multitude of metabolic traits.

Results:

We found that genetic ablation of Tspan8 in mice results in a reduction (−15.6%) in the body weight of males fed a normal chow diet and that this deficiency results in a resistance to body weight gain (−13.7%) upon feeding a high fat and high carbohydrate diet. The differences in body weight could only be detected in male mice and were the consequence of both a decrease in fat deposition, and a decrease in lean body mass (16.9 and 11%, respectively). In spite of the significant body weight difference, no changes in fasting insulin and glucose levels could be detected in Tspan8 knockout mice, nor could we identify changes in the clearance of glucose or sensitivity to insulin in oral glucose tolerance test and intraperitoneal insulin sensitivity test studies, respectively. In addition, male Tspan8 knockout mice showed significantly lower bone mineral density and phosphorus levels (6.2 and 16.6%, respectively). Expression of Tspan8 in mouse was highest in digestive tissues, but virtually absent from the pancreas. In contrast, expression of human TSPAN8 was substantial in digestive tissues, as well as pancreatic cells.

Conclusions:

Our results argue for a role for Tspan8 in body-weight regulation in males, but do not show differences in T2D-associated traits that were anticipated from previous human genome-wide association studies. Differences in Tspan8 expression levels in mouse and human tissues suggest that Tspan8 could fulfill different or additional physiological functions in these organisms.

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Acknowledgements

We thank Liz Polizzi Somers, Neil Geoghagen, Jayne Chin, Zhu Chen, Jun Wang, Eric Muise, Danielle Greenawalt and John Mudgett for their help with reagent supply, data analysis and paper preparation and Drs Debraj GuhaThakurta, Kenny Wong and Brian Hubbard for their help and advice.

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Authors and Affiliations

  1. Institut Clinique de la Souris / Mouse Clinical Institute, Illkirch Cedex, France

    M-F Champy & M Selloum

  2. Department of Cardiovascular Diseases, Merck & Co, Inc., Rahway, NJ, USA

    L Le Voci, L B Peterson, A M Cumiskey & D Blom

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Correspondence to D Blom.

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Champy, MF., Le Voci, L., Selloum, M. et al. Reduced body weight in male Tspan8-deficient mice. Int J Obes 35, 605–617 (2011). https://doi.org/10.1038/ijo.2010.165

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