Prototype and Chimera-Type Galectins in Placentas with Spontaneous and Recurrent Miscarriages

Area of Science:

• Reproductive biology
• Immunology
• Cell biology

Background:

• Galectins are galactose-binding proteins implicated in various pregnancy pathologies.
• Understanding galectin roles in placental development is crucial for addressing pregnancy loss.

Purpose of the Study:

• To analyze prototype (gal-1, -2, -7, -10) and chimera-type (gal-3) galectin expression in first-trimester placentas from spontaneous abortion (SPA) and recurrent abortion (RA) cases.
• To compare galectin expression in affected placentas with healthy controls.

Main Methods:

• Immunofluorescence was employed to differentiate and evaluate galectin expression in various decidual cell types.
• Placental samples from 15 healthy pregnancies, 9 SPA cases, and 12 RA cases were analyzed.

Main Results:

• A significant decrease in prototype galectins (gal-1, -2, -7, -10) was observed in trophoblast cells of SPA and RA placentas.
• Galectin-2 expression was significantly reduced in decidua/extravillous trophoblast cells, suggesting a potential role in angiogenesis.
• Galectin-3 expression showed no significant alteration in abortive placentas.

Conclusions:

• Prototype galectins exhibit similar expression alterations in trophoblasts during SPA and RA, suggesting a shared functional role in placental tissue.
• Reduced galectin-2 may be linked to impaired angiogenesis in early pregnancy loss.
• Galectin-3 does not appear to be significantly involved in the pathogenesis of SPA and RA.