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Published on: May 21, 2015
Phospholipid containing choline histochemistry of mouse uterine epithelia during preimplantation stage
C S Paiva1, M C Alberto-Rincon, S M Paiva
1Department of Histology and Embryology, State University of Campinas, Brazil.
Insights
High lipid content in mouse uterine cells during early pregnancy is linked to endometrial changes, not just embryo nourishment. Phospholipid containing choline (PCC) levels fluctuate, suggesting a role in prostaglandin biosynthesis.
Area of Science:
- Reproductive biology
- Cellular and molecular biology
- Histochemistry
Background:
- The role of lipids in endometrial cells during pregnancy is not fully understood.
- Investigating lipid dynamics in the uterus is crucial for understanding early pregnancy.
Purpose of the Study:
- To analyze total lipids and phospholipid containing choline (PCC) in mouse uterine epithelia during the preimplantation stage.
- To correlate lipid changes with uterine physiological events during early pregnancy.
Main Methods:
- Histochemical techniques, including Sudan black staining, were employed.
- Analysis focused on glandular and luminal epithelia of the mouse uterus.
Main Results:
- Lipid intensity peaked in the luminal epithelium on day two of pregnancy.
- Phospholipid containing choline (PCC) staining showed peaks in both luminal and glandular epithelia on days two and five.
- Dynamic changes in lipid localization and quantity suggest high metabolic activity.
Conclusions:
- Lipid dynamics in uterine epithelia indicate significant metabolic activity during early pregnancy.
- The timing of PCC fluctuations correlates with uterine prostaglandin oscillations, suggesting a role in prostaglandin biosynthesis.
- Endometrial lipid droplets may be involved in critical uterine changes rather than solely nourishing embryos.
Abstract:
The physiological role of high lipid content in endometrial cells during pregnancy has not been well established. In the present work we used histochemical techniques to analyze the total lipids and phospholipid containing choline (PCC) in the mouse uterine glandular and luminal epithelia during preimplantation stage. Sudan black histochemistry showed the highest intensity during the second day of pregnancy in both the basal and apical portions of luminal epithelium. Peaks of PCC staining were seen both in the luminal and glandular epithelia at the second and fifth days of pregnancy. Changes in localization and in the amount of lipid in the uterine epithelia suggest high mobility and metabolic rates of this substance, which may be related to morphological and/or functional changes occurring at the same time in the pregnant uterus. The increase and depletion timing of PCC content in the uterine epithelia during preimplantation stage, when uterine prostaglandin is also oscillating, suggest a possible involvement of PCC in prostaglandin biosynthesis. Therefore, the fate of lipid droplets found in the uterine epithelia may be related to critical changes of the pregnant endometrium, rather than the nourishment of developing embryos alone.
