Objective
To assess and compare circulating tissue inhibitor of metalloproteinase 3 (TIMP‐3) concentrations between women with pre‐eclampsia and healthy pregnant women. We also aimed to determine the relationships between circulating TIMP‐3 and matrix metalloproteinase 2 (MMP‐2), MMP‐9, TIMP‐1, and TIMP‐2 concentrations in pre‐eclampsia.
Methods
A primary case–control study included patients with pre‐eclampsia (n = 219) and gestational hypertension (n = 118), healthy pregnant women (n = 214), and non‐pregnant women (n = 66), and a replication case–control study included patients with pre‐eclampsia (n = 177) and healthy pregnant women (n = 124), all from southeastern Brazil. Plasma TIMP‐3, MMP‐2, MMP‐9, TIMP‐1, and TIMP‐2 concentrations were assessed using commercially available enzyme‐linked immunosorbent assay kits, and the relationships between them were analyzed using Spearman's correlation.
Results
In our primary study, patients with pre‐eclampsia and gestational hypertension exhibited increased TIMP‐3 concentrations compared with healthy pregnant women (both P < 0.0001) and non‐pregnant women (both P < 0.001). These findings were confirmed in the replication study, showing elevated TIMP‐3 concentrations in women with pre‐eclampsia versus healthy pregnant women (P < 0.001). We found no difference in TIMP‐3 concentrations between early‐onset and late‐onset pre‐eclampsia. Moreover, TIMP‐3 concentrations were significantly correlated with plasma concentrations of TIMP‐1 (r = 0.2333; P = 0.0086) and MMP‐2 (r = 0.2159; P = 0.0156) in pre‐eclampsia.
Conclusions
Circulating TIMP‐3 concentration is increased in women with pre‐eclampsia compared with healthy pregnant women, and it is positively correlated with plasma MMP‐2 and TIMP‐1 concentrations in pre‐eclampsia.