Cytokine concentrations direct endothelial function in pregnancy and preeclampsia

Area of Science:

• Endocrinology and Reproductive Biology
• Cellular and Molecular Medicine
• Vascular Biology

Background:

• Endothelial dysfunction is central to preeclampsia, a hypertensive pregnancy disorder.
• Growth factors and cytokines are dysregulated in preeclampsia, but their precise effects on endothelial cells are not fully understood.

Purpose of the Study:

• To investigate the dose-dependent effects of various growth factors and cytokines on endothelial cell calcium (Ca2+) signaling and monolayer integrity.
• To model the impact of combined growth factor and cytokine concentrations on endothelial function.

Main Methods:

• Assessed Ca2+ signaling and monolayer integrity in response to individual growth factors/cytokines (VEGF165, TNFα, EGF, IL-1β, bFGF).
• Screened 16 dose combinations of VEGF165 and TNFα to model combined effects on Ca2+ signaling.

Main Results:

• VEGF165, TNFα, EGF, and IL-1β showed dose-dependent effects on Ca2+ signaling.
• TNFα and IL-1β decreased monolayer integrity; bFGF increased it.
• An optimal VEGF165 and TNFα combination supported pregnancy-adapted Ca2+ signaling, with deviations causing suppressed function.

Conclusions:

• Growth factor and cytokine concentrations significantly influence endothelial cell function, impacting Ca2+ signaling and integrity.
• Understanding these complex interactions is crucial for modeling healthy pregnancy and preeclampsia pathophysiology.
• Further research into combined factor effects is needed for accurate understanding of endothelial dysfunction in pregnancy.