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Immunochemical localization of platelet-derived growth factor in placenta and its possible role in pre-eclampsia
M R Gurski1, E Gonzalez, E G Brown
1Department of Pediatrics, Loiusiana State University Medical Center, Shreveport 71130-3932, USA.
Insights
Platelet-derived growth factor-AA (PDGF-AA) and its receptor are present in pre-eclampsia placentas. Increased PDGF-AA in preeclamptic placentas suggests a role in vascular repair and placental damage.
Area of Science:
- Reproductive Biology
- Vascular Biology
- Pathology
Background:
- Platelet-derived growth factor (PDGF) is crucial for cellular functions, proliferation, and angiogenesis, and is implicated in tissue injury, repair, and atherosclerosis.
- Pre-eclampsia (PRE) involves placental tissue injury, prompting investigation into the role of PDGF in its morphological and physiological changes.
- The study aimed to detect PDGF-AA and its alpha receptor in normotensive (NORM) and preeclamptic (PRE) placentas.
Purpose of the Study:
- To determine the presence and localization of PDGF-AA and its alpha receptor in term placentas from women with and without pre-eclampsia.
- To investigate potential correlations between PDGF-AA expression and placental pathology in pre-eclampsia.
Main Methods:
- Placental tissue samples were collected from 6 preeclamptic and 8 normotensive women at 38-42 weeks gestation.
- Immunocytochemistry was employed to analyze the presence of PDGF-AA in placental tissue samples.
- Tissue analysis included samples from both vaginal and Cesarean section deliveries.
Main Results:
- PDGF-AA and its alpha receptor were detected in both normotensive and preeclamptic placentas.
- Immunoreactive staining for PDGF-AA and its receptor was observed in the intimal/endothelial layer of fetal vessels and the trophoblastic layer.
- Staining intensity for PDGF-AA was notably greater in preeclamptic placental tissue exhibiting obliterative endarteritis.
Conclusions:
- PDGF-AA likely contributes to the restructuring of the fetoplacental vasculature in pre-eclampsia, particularly in cases with vascular intimal inflammation (obliterative endarteritis).
- Elevated PDGF-AA staining in the trophoblast layer of preeclamptic placentas with obliterative endarteritis may indicate widespread placental damage.
- PDGF-AA may play a significant role in the repair processes associated with placental damage in pre-eclampsia.
Background:
Platelet-derived growth factor (PDGF) has an important role in cellular function, proliferation, and angiogenesis. It is also associated with tissue injury and repair, and its involvement in atherosclerosis has been studied extensively. Tissue injury is also found in pre-eclampsia (PRE). The morphological and physiological changes that are taking place in the PRE placenta may be associated with this growth factor. The objective of this study was to determine if PDGF-AA and its alpha receptor are present in the cells and vessels of normotensive (NORM) and PRE placentas at term.
Methods:
Placental tissue was obtained from 6 preeclamptic and 8 normotensive women. Gestational age ranged from 38-42 weeks. Deliveries were either vaginal (vag, n = 10) or c-section (c-sec, n = 4). Tissue samples were analyzed for PDGF-AA by immunocytochemistry.
Results:
PDGF-AA and the alpha receptor were present in both NORM and PRE placentas. Immunoreactive staining revealed PDGF-AA and its receptor in the intimal/endothelial layer of fetal vessels and the trophoblastic layer. Staining intensity was greater in preeclamptic tissue when obliterative endarteritis was present.
Conclusions:
In pre-eclampsia, PDGF-AA may play a role in the restructuring of the fetoplacental vasculature, in particular when there is inflammation of the vascular intimal layer, as found in obliterative endarteritis. Increased staining in the trophoblast layer in patients with obliterative endarteritis also may be indicative of more widespread damage throughout the placenta itself, and PDGF-AA may play a significant role in the repair of this damage.