Human White Adipocytes Convert Into "Rainbow" Adipocytes In Vitro

Area of Science:

• Cell Biology
• Regenerative Medicine
• Adipocyte Biology

Background:

• White adipocytes possess plasticity, enabling transdifferentiation into other cell types in vivo.
• The full extent of adipocyte plasticity, particularly in human mature adipocytes (MA), remains incompletely understood.
• Understanding MA plasticity is crucial for potential applications in regenerative medicine.

Purpose of the Study:

• To investigate the plastic properties of human mature adipocytes (MA).
• To combine gene expression profiling with morphological analysis to detail MA transdifferentiation.
• To explore the stem cell-like characteristics and liposecretion potential of MA.

Main Methods:

• Microarray analysis to assess gene expression profiles of MA.
• Electron microscopy to examine cellular morphology and organelle development.
• Time-lapse microscopy to observe dynamic cellular processes like transdifferentiation.

Main Results:

• Primary MA displayed typical mature adipocyte morphology and gene expression.
• MA expressed significant levels of reprogramming genes, indicating inherent plasticity.
• MA in ceiling cultures transdifferentiated into fibroblast-like cells, retaining stem cell gene signatures and exhibiting liposecretion.
• Liposecretion phenomena were observed in human fat explants and rarely in vivo biopsies.

Conclusions:

• Human mature adipocytes (MA) possess significant plasticity and stem cell properties.
• MA can undergo transdifferentiation into fibroblast-like cells with liposecretion capabilities.
• These findings highlight the extraordinary in vivo plasticity of adipocytes and their potential for regenerative applications.