Related Experiment Video
Updated: Aug 8, 2026
Two Methods for Establishing Primary Human Endometrial Stromal Cells from Hysterectomy Specimens
Published on: May 23, 2014
Immunohistochemical characterization of human endometrial microvascular basement membrane components during the
F D Kelly1, S A Tawia, P A Rogers
1Monash University Department of Obstetrics and Gynaecology, Monash Medical Centre, Clayton, Victoria, Australia.
Insights
This study reveals varying basement membrane components in the human endometrium during the menstrual cycle. Heparan sulphate proteoglycan (HSPG) reduction in vascular basement membranes may influence endometrial vascular remodeling.
Area of Science:
- Reproductive biology
- Cellular and molecular biology
- Histology
Background:
- The endometrium undergoes cyclical changes involving vascular remodeling.
- Basement membranes are crucial for tissue structure and function.
- Specific components of the endometrial basement membrane and their cyclical expression are not fully understood.
Purpose of the Study:
- To investigate the expression patterns of collagen IV (CIV), laminin, heparan sulphate proteoglycan (HSPG), and platelet endothelial cell adhesion molecule (PECAM) in the human endometrium across different menstrual cycle stages.
- To examine the activity of alkaline phosphatase (ALP) in the endometrium throughout the menstrual cycle.
- To identify potential roles of these components in endometrial vascular remodeling.
Main Methods:
- Immunohistochemistry was used to detect CIV, laminin, HSPG, and PECAM in cryostat sections of normal human endometrial biopsies.
- Enzyme histochemistry was employed to detect alkaline phosphatase (ALP) activity.
- Endometrial biopsies were collected from menstrual, proliferative, and secretory phases of the menstrual cycle.
Main Results:
- CIV, laminin, and HSPG were consistently expressed in glandular and vascular basement membranes across all menstrual cycle stages.
- PECAM was localized to endothelial cells, indicating its presence in all endometrial vessels.
- Heparan sulphate proteoglycan (HSPG) and alkaline phosphatase (ALP) showed significantly lower vessel staining compared to CIV and laminin.
- During menstruation, HSPG significantly decreased in vascular basement membranes while remaining strong in glandular basement membranes.
- ALP activity exhibited variability in both vessels and glands throughout the cycle.
Conclusions:
- There is heterogeneity in basement membrane composition within the endometrial microvasculature.
- The reduction of HSPG in vascular basement membranes during menstruation may be a key factor in endometrial vascular remodeling.
- These findings contribute to understanding the dynamic changes in the endometrium during the menstrual cycle.
Abstract:
The expression of three basement membrane components [collagen IV (CIV), laminin and heparan sulphate proteoglycan (HSPG)] and platelet endothelial cell adhesion molecule (PECAM) were examined by immunohistochemistry in cryostat sections of normal human endometrium. Alkaline phosphatase (ALP) was detected using enzyme histochemistry. Endometrial biopsies from the menstrual (n = 4), mid-late proliferative (n = 5), early-mid secretory (n = 5) and late secretory (n = 5) stages were collected from women with a normal menstrual cycle. At all four stages of the menstrual cycle, CIV, laminin and HSPG were expressed on basement membranes of both vessels and glands whilst PECAM expression was localized specifically to endothelial cells. A similar number of vessels/mm2 stained for CIV and laminin, as well as for PECAM at each stage of the menstrual cycle, demonstrating that all vessels in endometrium stain for these two basement membrane components. By contrast, the number of vessels/mm2 that stained positively for HSPG and ALP was significantly lower, averaging approximately 55% of the total that stained positively for PECAM, CIV and laminin. During the menstrual stage, HSPG staining intensity remained strong in glandular basement membranes but decreased dramatically in vascular basement membranes. ALP activity was variable in both the vessels and glands throughout the four stages of the menstrual cycle studied. This study demonstrates heterogeneity in basement membrane components within the endometrial microvasculature. It is postulated that the disappearance of HSPG from vascular basement membranes may play a role in the process of vascular remodelling during the menstrual stage of the cycle.
More Related Videos
05:16Multiplexed Fluorescent Immunohistochemical Staining of Four Endometrial Immune Cell Types in Recurrent Miscarriage
Published on: August 4, 2021
07:46Platform for Quantitative Detection of Endometrial Immune Cells Based on Immunohistochemistry and Digital Image Analysis
Published on: October 13, 2023
