Inclusion-bearing cells in industrial workers exposed to lead

Area of Science:

• Nephrology
• Toxicology
• Cell Biology

Background:

• Lead exposure is a known nephrotoxicant.
• Renal tubular epithelial cells characteristically form intranuclear inclusion bodies in response to lead.

Purpose of the Study:

• To investigate the presence and characteristics of lead-induced intranuclear inclusion bodies in the urinary sediment of lead workers.
• To differentiate these inclusions from other nuclear abnormalities.

Main Methods:

• Histochemical and microscopic examination of renal tissue.
• Cytologic examination of urinary sediment from lead workers.

Main Results:

• Intranuclear inclusion bodies were identified in renal tubular epithelial cells of lead-exposed individuals.
• Exfoliated inclusion-bearing cells of proximal renal tubular origin were found in the urinary sediment of 21% of lead workers.
• Lead-induced inclusions were morphologically distinct from viral, degenerative, or reparative nuclear changes.

Conclusions:

• The presence of exfoliated inclusion-bearing cells in urinary sediment provides cytologic evidence of lead-induced tubular injury.
• The clinical significance and utility of these cells for medical monitoring require further investigation.