In utero and lactational PCB exposure drives anatomic changes in the juvenile mouse bladder

Area of Science:

• Environmental toxicology
• Developmental biology
• Urology

Background:

• Bladder dysfunction is a common health issue with poorly understood risk factors.
• The impact of developmental exposure to environmental chemicals on bladder development is understudied.
• Polychlorinated biphenyls (PCBs) are known neurotoxicants, but their effect on peripheral organs like the bladder is unknown.

Purpose of the Study:

• To investigate the effects of developmental exposure to an environmentally relevant PCB mixture on bladder development and function.
• To determine if PCBs accumulate in the bladder and alter its structure or neuroanatomy.
• To assess sex-specific effects of developmental PCB exposure on the bladder.

Main Methods:

• Mice dams were exposed to a PCB mixture during gestation and lactation.
• Offspring bladders were collected and analyzed for PCB concentrations, nerve density, and cellular changes.
• Histological and molecular techniques were used to evaluate bladder composition, apoptosis, and inflammation markers.

Main Results:

• PCBs were detected in bladders in a dose-dependent manner.
• Developmental PCB exposure increased bladder volume and suburothelial nerve density in male mice.
• Increased nerve density correlated with mast cell presence, suggesting inflammation, but no overt toxicity or obstruction was observed.

Conclusions:

• Developmental exposure to PCBs can lead to altered bladder neuroanatomy and increased bladder volume in male mice.
• These findings suggest PCBs may be a risk factor for bladder dysfunction following early-life exposure.
• Further research is needed to understand the long-term implications and mechanisms of PCB-induced bladder alterations.