Journal
DIABETOLOGIA
Volume 44, Issue 2, Pages 209-219Publisher
SPRINGER-VERLAG
DOI: 10.1007/s001250051601
Keywords
diabetes; pregnancy; hyperglycaemia; proliferation; placenta; growth delay; cell cycle; hyperosmolarity
Categories
Ask authors/readers for more resources
Aims/hypothesis. Early intrauterine growth delay in diabetes could be caused by a reduced growth of the placenta. Our study investigates whether hyperglycaemia in vitro reduces trophoblast proliferation. Methods. First-trimester trophoblast cell models (BeWo, JAR and JEG-3 choriocarcinoma cells) were cultured for 24 and 48 h with 5.5 mmol/l D-glucose, 25 mmol/l D-glucose (hyperglycaemia) and with an osmotic control. Cell number, total protein and nucleic acid content and mitochondrial activity (tetrazolium salt assay) were measured, the cell cycle analysed (FACS, cyclin B1 levels) and apoptosis (Annexin-V) measured. Results. In BeWo cells hyperglycaemia reduced cell number, protein, nucleic acid and cyclin B1 levels. The reduced G(2)/M and increased G(0)/G(1) population after 24 h reflects growth arrest at G(0)/G(1). In JAR cells after 24 h the population was arrested in G(0)/G(1), whereas after 48 h the G(0)/G(1) block was abrogated and the cells were arrested at G(2)/M. The net effect was an unchanged cell number. In JEG-3 cells hyperglycaemia resulted in fewer cells after 24 h but not after 48 h indicating some adaptation. Mitochondrial activity was either stimulated (BeWo) or reduced (JAR, JEG-3) under hyperglycaemia. Some of these effects were also induced by hyperosmolarity alone. Conclusion/interpretation. Hyperglycaemia has the potential to inhibit the proliferation of first-trimester trophoblast cell models. The mechanisms leading to growth arrest and to changes in mitochondrial activity are complex and depend on differentiation. We hypothesise a hyperglycaemia-induced impairment of placental growth in the first trimester of a poorly controlled diabetic pregnancy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available