LAMB1 regulates COL3A1 and RAC1 expression during subchorionic hemorrhage progression

Area of Science:

• Reproductive biology
• Immunology
• Molecular biology

Background:

• Subchorionic hemorrhage (SCH) presents as a hypoechoic area in early pregnancy, impacting pregnancy outcomes.
• The role of laminin subunit β1 (LAMB1) in SCH-associated coagulation and immune responses remains unclear.

Purpose of the Study:

• To investigate the role of LAMB1 in subchorionic hemorrhage (SCH).
• To elucidate the mechanisms by which LAMB1 modulates type III collagen (COL3A1) and Rac family small GTPase 1 (RAC1) in SCH.

Main Methods:

• Proteomic and transcriptomic analyses of decidua and villous tissues from SCH patients and controls.
• Bioinformatics and machine learning for biomarker screening.
• In vivo (rat model) and in vitro (trophoblast cells) experiments to assess LAMB1 function.

Main Results:

• LAMB1 was identified as a central protein in SCH, with its expression upregulated alongside COL3A1 and downregulated RAC1.
• LAMB1 knockdown in vivo reduced inflammation and improved pregnancy outcomes, while in vitro, LAMB1 silencing enhanced trophoblast function.
• LAMB1 was found to promote inflammation and coagulation dysfunction via the COL3A1/RAC1 axis.

Conclusions:

• LAMB1 plays a critical role in promoting inflammation and coagulation dysfunction in subchorionic hemorrhage.
• Targeting LAMB1 presents a potential novel therapeutic strategy for improving pregnancy outcomes in SCH.