The placenta in pseudoxanthoma elasticum: clinical, structural and immunochemical study

Area of Science:

• Reproductive biology
• Pathology
• Genetics

Background:

• Pseudoxanthoma elasticum (PXE) is a rare genetic disorder affecting elastic fibers, leading to calcification.
• PXE can manifest with skin, cardiovascular, and ocular complications.
• Pregnancy complications in women with PXE, though infrequent, have been documented.

Purpose of the Study:

• To compare placental structural features between women with PXE and controls.
• To investigate the impact of abnormal mineral and matrix accumulation on placental function in PXE.
• To identify specific alterations in placental tissue associated with PXE.

Main Methods:

• Comparison of placentae from 15 PXE-affected women and 14 controls at term.
• Gross and light microscopy examination of placental morphology.
• Electron microscopy and immunocytochemistry to analyze mineral deposition and matrix proteins.

Main Results:

• No significant differences in placental weight, dimensions, infarcts, thrombi, or inflammatory lesions.
• Statistically increased necrotic changes and mineralization observed in PXE placentae.
• Electron microscopy revealed greater mineral deposition associated with fibrinoid and collagen fibrils in PXE placentae, particularly on the maternal side.
• Immunocytochemistry confirmed vitronectin and fibronectin association with PXE mineralizations.

Conclusions:

• PXE placentae exhibit enhanced mineralization and necrotic changes compared to controls.
• Abnormal mineral deposition occurs in the placental extracellular matrix, associated with specific proteins like vitronectin and fibronectin.
• These placental alterations in PXE may indicate localized matrix remodeling and mineralization processes.