Disruption of normal adipocyte development and function by methyl- and propyl- paraben exposure

Area of Science:

• Endocrinology
• Metabolism
• Cell Biology

Background:

• Methyl- and propyl- parabens are common preservatives in personal care products, generally recognized as safe.
• Previous studies linked parabens to increased white adipogenesis and adipose tissue mass.

Purpose of the Study:

• To investigate the effects of methyl- and propyl- parabens on brown adipocytes, similar to their known effects on white adipocytes.
• To determine if paraben exposure impacts adipogenesis, glucose uptake, and lipolysis in both white and brown adipocytes.

Main Methods:

• White and brown pre-adipocytes were exposed to low doses of methyl- and propyl- parabens during differentiation.
• Adipogenesis was assessed using the Oil Red O (ORO) assay.
• Glucose uptake and lipolytic activity were measured using fluorescent analogs and enzymatic assays, respectively.

Main Results:

• Methyl- and propyl- parabens enhanced adipogenesis in white adipocytes but not brown adipocytes.
• In white adipocytes, methyl paraben increased glucose uptake, and both parabens reduced basal lipolysis.
• In brown adipocytes, parabens did not affect basal lipolysis but attenuated isoproterenol-induced lipolysis.

Conclusions:

• Methyl- and propyl- parabens differentially affect white and brown adipocytes.
• These parabens influence adipocyte differentiation and metabolic functions in a cell-autonomous manner.
• The findings suggest distinct cellular mechanisms underlying paraben interactions with different adipose tissue types.