PZP and PAI-2: Structurally-diverse, functionally similar pregnancy proteins?

Area of Science:

• Biochemistry
• Immunology
• Reproductive Medicine

Background:

• Pregnancy zone protein (PZP) and plasminogen activator inhibitor type 2 (PAI-2) are multifunctional proteins elevated during normal pregnancy and inflammatory conditions.
• Initially identified as protease inhibitors, PZP and PAI-2 are now recognized for potential roles in modulating T-helper cells and acting as extracellular chaperones.

Purpose of the Study:

• To clarify the diverse functions of PZP and PAI-2 in normal pregnancy.
• To understand the potential link between PZP and PAI-2 functions and the pathogenesis of preeclampsia.

Main Methods:

• This study reviews existing literature on PZP and PAI-2 functions.
• Analysis of the roles of inflammation, fibrinolysis, and protein misfolding in preeclampsia pathology.

Main Results:

• Reduced levels of PZP or PAI-2 are associated with preeclampsia.
• PZP and PAI-2 may play crucial roles in maintaining extracellular proteostasis and immunoregulation.

Conclusions:

• Understanding PZP and PAI-2 functions in normal pregnancy is vital for insights into preeclampsia.
• The roles of PZP and PAI-2 in proteostasis and immunoregulation may have implications for numerous disorders involving inflammation and protein misfolding.