Related Experiment Video
Updated: Jan 5, 2026
Isolation and Identification of Vascular Endothelial Cells from Distinct Adipose Depots for Downstream Applications
Published on: June 10, 2022
Characterization of two populations of human coronary artery endothelial cells(1)
Huakang Wu1, Qizhi Yao, Alan Lumsden
1Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine and the Methodist Hospital, Houston, Texas 77030, USA.
Insights
Human coronary artery endothelial cells (HCAECs) consist of two distinct populations with differing gene expression and responses to TNF-alpha. This heterogeneity may impact cardiovascular health and disease.
Area of Science:
- Endothelial cell biology
- Cardiovascular research
- Cellular heterogeneity
Background:
- Endothelial cell heterogeneity is implicated in angiogenesis, vascular healing, and cardiovascular disease.
- Understanding distinct endothelial cell populations is crucial for comprehending vascular health and pathology.
Purpose of the Study:
- To identify and characterize distinct populations of human coronary artery endothelial cells (HCAECs).
- To analyze gene expression profiles of these HCAEC populations.
- To investigate their differential responses to tumor necrosis factor-alpha (TNF-alpha) stimulation.
Main Methods:
- Commercial HCAECs were cultured and analyzed using flow cytometry based on size-scatter distribution.
- Gene expression analysis was performed on identified HCAEC populations.
- Cells were stimulated with TNF-alpha (1 ng/ml) for 16 hours to assess differential responses.
Main Results:
- Two distinct HCAEC populations, HCAEC-I (small) and HCAEC-II (large), were consistently identified.
- Both populations expressed endothelial markers (von Willebrand factor, CD31) but differed significantly in cadherin-5, VEGF-R2, eNOS, VCAM-1, E-selectin, CXCR4, CCR5, P1H12, and ICAM-1 expression.
- TNF-alpha stimulation upregulated ICAM-1, VCAM-1, and E-selectin in both populations, with HCAEC-I showing higher VEGFR-2, eNOS, CXCR4, and CCR-5 expression post-stimulation.
Conclusions:
- Commercial HCAECs comprise two distinct populations with unique gene expression patterns and TNF-alpha responses.
- This endothelial cell heterogeneity holds potential biological and pathological significance in coronary arteries.
- Further research is warranted to elucidate the specific roles of these HCAEC subpopulations in vascular function and disease.
Background:
Heterogeneity of endothelial cells may affect angiogenesis, vascular healing, and cardiovascular disease formation. The objective of this study was to identify and characterize populations of human coronary artery endothelial cells (HCAECs), their gene expression levels, and response to TNF-alpha stimulation.
Materials And Methods:
Commercial HCAECs were cultured with EGM-2 complete medium. Cell population was determined by flow cytometry analysis based on size-scatter distribution. Gene expression for each population with or without TNF-alpha (1 ng/ml) stimulation for 16 h was also studied by flow cytometry analysis with proper gating and fluorescence labeling of antibodies.
Results:
Two distinguished populations, HCAEC-I (small) and HCAEC-II (large), were identified through all passages (from 2 to 10) during cultures. Both HCAEC-I and HCAEC-II showed more than 90% positive staining for both von Willebrand factor and CD31 and were negative for CD34 and CD4 (less than 2%). HCAEC-I had substantially higher expression of cadherin-5 (71.91% versus 51.07%) than HCAEC-II. HCAEC-I also expressed much higher levels of vascular endothelial growth factor receptor-2 (VEGF-R2) (17.35% versus 0.77%), endothelial nitric oxide synthase (eNOS) (44.64% versus 2.54%), VCAM-1 (6.08% versus 1.18%), E-selectin (18.68% versus 1.42%), CXCR4 (61.05% versus 7.98%), and CCR5 (48.66% versus 1.97%) than HCAEC-II. HCAEC-II, however, had substantially higher expression of P1H12 (93.07% versus 58.73%) and ICAM-1 (94.37% versus 58.62%) than HCAEC-I. Following TNF-alpha stimulation, both populations substantially increased the expression of ICAM-1, VCAM-1, and E-selectin. HCAEC-I, however, had much higher expressions of VEGFR-2, eNOS, CXCR4, and CCR-5 than HACEC-II after TNF-alpha stimulation.
Conclusions:
These data demonstrate that commercial HCAECs have two distinguished populations with different gene expression patterns and different responses following TNF-alpha stimulation. This study indicates that the heterogeneity of HCAECs may have biologic or pathologic significances in coronary arteries.
