Adipocyte size distribution: Mathematical model of a tissue property

Area of Science:

• Cell biology
• Mathematical modeling
• Metabolic research

Background:

• White adipose tissue stores energy via lipid accumulation in adipocytes.
• Adipocyte size distribution is notably bimodal, a phenomenon previously modeled as a result of cellular bistability.
• Existing models did not fully account for cell population variability.

Purpose of the Study:

• To develop a computational method for evaluating adipocyte size distribution equilibria considering cell variability.
• To investigate the role of cellular variability in adipocyte size distribution.
• To determine the underlying mechanisms responsible for the bimodal distribution of adipocyte sizes.

Main Methods:

• Computational modeling of lipid fluxes within adipocytes.
• Evaluation of equilibrium states incorporating cell-to-cell variability.
• Comparison of model predictions with experimental size distribution data.

Main Results:

• Cellular variability is crucial for generating realistic adipocyte size distributions.
• Size distributions assuming a proportion of bistable cells do not align with empirical data.
• A mono-stable cellular profile is sufficient to explain and qualitatively reproduce the observed bimodal size distribution.

Conclusions:

• Adipocyte size distribution bimodality arises from a tissue-level property, not individual cellular bistability.
• Cellular variability plays a key role in achieving realistic adipocyte size distributions.
• The study reframes the understanding of adipose tissue structure and regulation.