Hysteresis of White Adipose Tissue

Alain Géloën^1*, Hédi Soula^1,2,3, Lilas Hadji¹, Emmanuelle Berger¹

¹Université de Lyon, CARMEN INSERM U1060, INSA-Lyon, F-69621, Villeurbanne, France.
²IXXI Complex Systems Institute, Lyon, France.
³EPI BEAGLE INRIA F-69621, Villeurbanne, France.

DOI: 10.4236/ojemd.2015.510018                

Abstract

Objective: This study was performed to analyze the modifications within adipose tissue during calorie restriction and more specifically to state whether hysteresis occurs during fat mass reduction. Method: Rats male Wistar increased their body weight by 130 g under control conditions and were then submitted to a calorie restriction (CR) at 30% or 60% of control. Experiment has been stopped when the body weight of the group CR60% returned back to its initial value. Samples of retroperitoneal adipose tissue were collected by biopsies along the study. Adipose cell size was analyzed using multisizer IV (Beckman Coulter) to determine the size distribution curves during natural growth and after calorie restriction. Results: After CR60%, body weights and adipose tissue masses were similar to the ones at the beginning of the experiment. Adipose cell size distribution curve was shifted to the left compared to the one of initial control. Adipose cell sizes were significantly lower after CR60% than those of control at the beginning of the experiment. Conclusions: These results state for the first time that hysteresis occurs in white adipose tissue after calorie restriction. The composition of adipose tissue after calorie restriction was significantly different than the one of initial control. After significant weight loss, organisms must be considered as different from the initial controls, they are most likely governed by different regulations which will have to be identified.

Keywords

Adipocyte Size, White Adipose Tissue, Calorie Restriction, Hysteresis

Conflicts of Interest

The authors declare no conflicts of interest.

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