GO:0002043 blood vessel endothelial cell proliferation involved in sprouting angiogenesis: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002043 describes the proliferation of blood vessel endothelial cells that specifically contributes to sprouting angiogenesis, a key process in new blood vessel formation.
• Sprouting angiogenesis requires coordinated endothelial cell proliferation, migration, and lumen formation, with VEGF, Notch, and Ang-Tie2 signaling as central regulators [1,4].
• Key genes driving this process include VEGFA, KDR, FLT1, DLL4, NOTCH1, ANGPT2, TEK, and metabolic regulators such as PFKFB3 [1,3,4].
• Endothelial cell proliferation during sprouting is tightly regulated by metabolic cues, including FGF-dependent control of vascular development.
• Dysregulation of this process contributes to tumor angiogenesis, retinopathies, and cardiovascular diseases, making it a therapeutic target [7,8].
• CRISPR-based knockout, knock-in, and overexpression models enable causal interrogation of genes involved in endothelial sprouting [2,5].
Description
Sprouting angiogenesis is the fundamental process by which new blood vessels arise from pre-existing ones, and it depends on the proliferation of endothelial cells at the sprout tip and stalk. The Gene Ontology term GO:0002043, blood vessel endothelial cell proliferation involved in sprouting angiogenesis, captures the specific multiplication of blood vessel endothelial cells that expands the cell population contributing to this sprouting process. This term is distinct from general endothelial proliferation because it is spatially and temporally coupled to sprout formation and guidance. Understanding this process is critical for developmental biology, tissue repair, and diseases characterized by aberrant angiogenesis, such as cancer and diabetic retinopathy. Recent studies have highlighted the importance of metabolic control, with FGF signaling regulating vascular development through metabolic pathways. Moreover, single-cell analyses of blood-brain barrier response to pericyte loss have revealed dynamic endothelial proliferation changes. The interplay between VEGF, Ang-Tie2, and Notch signaling is essential for proper sprout formation and endothelial proliferation [1,4]. This article synthesizes current knowledge on GO:0002043, covering its definition, mechanisms, key genes, disease relevance, and research methodologies.
blood vessel endothelial cell proliferation involved in sprouting angiogenesis At A Glance
| GO ID | GO:0002043 |
|---|---|
| GO term | blood vessel endothelial cell proliferation involved in sprouting angiogenesis |
| Ontology | biological_process |
| Synonym | blood vessel endothelial cell proliferation during sprouting angiogenesis |
| Major function | Expansion of endothelial cell population during sprout formation |
| Related process | Sprouting angiogenesis (GO:0002040) |
| Cellular location | Endothelial cells of blood vessels |
| Key regulators | VEGF, Notch, Ang-Tie2, FGF signaling [1,3,4] |
What Is GO:0002043?
GO:0002043 is defined as the multiplication or reproduction of blood vessel endothelial cells, resulting in the expansion of a cell population contributing to sprouting angiogenesis. In simpler terms, it is the process by which endothelial cells divide to provide the necessary cell mass for a new capillary sprout to extend and form a functional vessel.
Why Is blood vessel endothelial cell proliferation involved in sprouting angiogenesis Important in Cell Biology?
GO:0002043 is essential for understanding how new blood vessels form during development, wound healing, and in pathological conditions such as cancer and ischemic diseases [6,7]. Endothelial cell proliferation during sprouting is a rate-limiting step in angiogenesis, and its dysregulation leads to excessive or insufficient vessel growth. Targeting this process offers therapeutic opportunities for anti-angiogenic cancer therapy and pro-angiogenic treatments for cardiovascular diseases.
• Critical for embryonic development and organogenesis.
• Drives tumor angiogenesis, supporting cancer growth and metastasis.
• Implicated in diabetic retinopathy and age-related macular degeneration.
• Essential for wound healing and tissue regeneration.
• Regulated by metabolic pathways, linking metabolism to vascular growth.
• Involved in blood-brain barrier maintenance and response to pericyte loss.
• Target for anti-angiogenic drugs in oncology.
• Provides a model for studying cell cycle control in endothelial cells.
• Key to understanding lymphangiogenesis due to shared mechanisms.
• Relevant for tissue engineering and regenerative medicine.
What Happens During blood vessel endothelial cell proliferation involved in sprouting angiogenesis?
Initiation by Pro-angiogenic Signals
In simple terms: The process starts when signals like VEGF tell endothelial cells to divide.
Sprouting angiogenesis begins with the release of pro-angiogenic factors such as VEGF-A, which bind to receptors on endothelial cells and trigger intracellular signaling cascades that promote proliferation. This activation leads to the selection of tip cells and stalk cells, with tip cells guiding the sprout and stalk cells proliferating to elongate the vessel. VEGF-induced ephrin-B2 signaling is crucial for this step, as it controls endothelial cell proliferation and migration.
Metabolic Reprogramming for Proliferation
In simple terms: Endothelial cells change their metabolism to support rapid division.
Proliferating endothelial cells undergo metabolic reprogramming, including increased glycolysis, to meet the biosynthetic demands of cell division. FGF signaling regulates this metabolic control of vascular development, linking growth factor cues to endothelial proliferation. This metabolic shift is essential for sustaining sprouting angiogenesis.
Cell Cycle Entry and Progression
In simple terms: Endothelial cells enter the cell cycle and divide.
Upon stimulation, endothelial cells progress through the cell cycle, with key checkpoints regulated by cyclins and cyclin-dependent kinases. The proliferation of stalk cells is tightly coordinated with tip cell migration to ensure proper sprout extension. Notch signaling modulates this proliferation by lateral inhibition, preventing excessive tip cell formation.
Coordination with Migration and Lumen Formation
In simple terms: Dividing cells work together with moving cells to form a new vessel tube.
Endothelial proliferation is spatially and temporally coordinated with migration and lumen formation. Stalk cells proliferate behind the tip cell, while tip cells migrate and guide the sprout. Ang-Tie2 signaling, involving angiopoietins and the Tie2 receptor, regulates endothelial cell survival and proliferation during this phase.
Resolution and Quiescence
In simple terms: Once the new vessel is formed, cells stop dividing and become stable.
After the sprout connects to form a functional vessel, endothelial cells return to a quiescent state. This transition is regulated by factors such as BMP signaling, which can paradoxically inhibit or promote endothelial behaviors depending on context. Proper resolution prevents excessive angiogenesis and maintains vascular homeostasis.
Key Genes Involved in GO:0002043 blood vessel endothelial cell proliferation involved in sprouting angiogenesis
The following genes and proteins are central to the regulation and execution of blood vessel endothelial cell proliferation involved in sprouting angiogenesis.
| Gene | Major Role | Research Relevance |
|---|---|---|
| VEGFA | Primary pro-angiogenic growth factor | Target for anti-angiogenic therapy; knockout models show impaired angiogenesis |
| KDR (VEGFR2) | VEGF receptor mediating proliferation signals | Key mediator of endothelial proliferation; point mutations affect signaling |
| FLT1 (VEGFR1) | Modulates VEGF signaling | Regulates sprout guidance; knockout leads to excessive angiogenesis |
| DLL4 | Notch ligand regulating tip/stalk selection | Controls proliferation; knockout causes hypersprouting |
| NOTCH1 | Receptor coordinating cell fate | Modulates proliferation; mutations linked to vascular anomalies |
| ANGPT2 | Antagonist of Tie2, promotes sprouting | Regulates vascular remodeling; overexpression models |
| TEK (Tie2) | Receptor for angiopoietins | Controls endothelial survival and proliferation |
| PFKFB3 | Glycolytic enzyme | Metabolic regulator of proliferation; knockout reduces angiogenesis |
| FGFR1 | FGF receptor | Mediates FGF-dependent metabolic control |
| EPHB4 | Ephrin receptor | Regulates sprouting; knockout impairs angiogenesis |
| EFNB2 | Ephrin ligand | Controls VEGF-induced proliferation |
| CDH5 (VE-cadherin) | Endothelial junction protein | Maintains cell-cell contacts during proliferation |
| PECAM1 (CD31) | Endothelial marker | Used for sorting proliferating endothelial cells |
| PDGFB | Pericyte recruitment factor | Indirectly regulates endothelial proliferation |
| BMPR2 | BMP receptor | Modulates endothelial behaviors; mutations in PAH |
| SMAD1/5/8 | BMP signaling effectors | Regulate proliferation and differentiation |
| HIF1A | Hypoxia-inducible factor | Induces VEGF and other pro-angiogenic genes |
How Is blood vessel endothelial cell proliferation involved in sprouting angiogenesis Regulated?
The proliferation of blood vessel endothelial cells during sprouting angiogenesis is regulated by a complex network of signaling pathways. VEGF-A binding to VEGFR2 activates downstream pathways including PI3K/AKT and MAPK/ERK, driving cell cycle progression. Notch signaling via DLL4 and NOTCH1 modulates proliferation by lateral inhibition, ensuring a balance between tip and stalk cell populations. Ang-Tie2 signaling, through angiopoietin-1 and -2, controls endothelial survival and proliferation. Metabolic regulation by FGF signaling and PFKFB3-mediated glycolysis is critical for sustaining proliferation under the demanding conditions of sprouting. Additionally, BMP signaling can either promote or inhibit endothelial proliferation depending on context, adding another layer of regulation.
blood vessel endothelial cell proliferation involved in sprouting angiogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| VEGFA | Cancer, retinopathy | Knockout and overexpression in endothelial cells |
| DLL4 | Tumor angiogenesis, vascular anomalies | Point mutation and knockout models |
| TEK | Venous malformations, pulmonary hypertension | Knock-in of patient mutations |
| BMPR2 | Pulmonary arterial hypertension | Knockout and point mutation models |
| PFKFB3 | Metabolic disorders, angiogenesis | Knockout and overexpression |
Cancer and Tumor Angiogenesis
Tumor angiogenesis relies on the proliferation of endothelial cells to form new blood vessels that supply nutrients and oxygen to the growing tumor. GO:0002043 is therefore a key target for anti-angiogenic therapies, such as bevacizumab, which inhibits VEGF signaling. Dysregulated endothelial proliferation contributes to tumor progression and metastasis, making it a focus of cancer research.
Retinopathies and Ocular Neovascularization
In diseases such as diabetic retinopathy and age-related macular degeneration, excessive endothelial cell proliferation leads to pathological neovascularization, causing vision loss. Understanding the mechanisms of GO:0002043 is essential for developing targeted therapies to inhibit aberrant sprouting in the eye.
Cardiovascular and Ischemic Diseases
Insufficient endothelial proliferation during sprouting angiogenesis contributes to impaired wound healing and ischemic tissue damage. Therapeutic strategies aim to promote angiogenesis in conditions like peripheral artery disease and myocardial infarction. Endometrial angiogenesis, which involves similar mechanisms, is also relevant for reproductive disorders.
Blood-Brain Barrier and Neurovascular Disorders
Pericyte loss in the brain leads to blood-brain barrier dysfunction and altered endothelial proliferation, as shown by single-cell analysis. This has implications for neurodegenerative diseases and stroke. BMP signaling, which regulates endothelial behaviors, is also implicated in vascular anomalies and pulmonary arterial hypertension.
From blood vessel endothelial cell proliferation involved in sprouting angiogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate endothelial proliferation? | CRISPR knockout in HUVECs or mouse models |
| Does a specific mutation affect VEGFR2 signaling? | Point mutation knock-in in endothelial cells |
| Can we visualize proliferating endothelial cells in vivo? | Tagged knock-in of fluorescent reporters |
| Does overexpression of pro-angiogenic factor increase sprouting? | Overexpression in zebrafish or mouse retina |
| What is the role of metabolic enzyme in angiogenesis? | Knockout and rescue with wild-type or mutant |
| How does pericyte loss affect endothelial proliferation? | Single-cell RNA-seq in pericyte-deficient mice |
How to Study the blood vessel endothelial cell proliferation involved in sprouting angiogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| EdU incorporation | DNA synthesis (proliferation) | In vitro endothelial proliferation |
| Ki-67 staining | Proliferation marker | In vivo and in vitro |
| Single-cell RNA-seq | Transcriptional heterogeneity | Endothelial subpopulations |
| Retinal angiogenesis assay | Sprout formation and proliferation | Mouse models |
| Zebrafish ISV formation | Angiogenesis in vivo | Genetic screens |
| Seahorse assay | Glycolysis and respiration | Metabolic regulation |
| Immunofluorescence | Protein localization | Vessel sprouting |
| Western blot | Protein expression | Signaling pathways |
Single-Cell RNA Sequencing
Single-cell RNA sequencing allows profiling of endothelial cell heterogeneity and proliferation status during sprouting angiogenesis. This method can identify distinct subpopulations of proliferating endothelial cells and their transcriptional signatures.
Endothelial Cell Proliferation Assays
In vitro assays such as EdU incorporation, Ki-67 staining, and MTT assays measure endothelial cell proliferation in response to angiogenic stimuli. These are commonly used to assess the effects of gene knockouts or treatments on proliferation.
In Vivo Angiogenesis Models
Mouse retinal angiogenesis, zebrafish intersegmental vessel formation, and Matrigel plug assays are used to study sprouting angiogenesis in vivo [1,3]. These models allow visualization of endothelial proliferation and sprout formation.
Metabolic Flux Analysis
Seahorse extracellular flux analysis and metabolomics measure glycolytic and oxidative metabolism in proliferating endothelial cells. This is crucial for understanding metabolic regulation of angiogenesis.
How CRISPR Can Be Used to Study GO:0002043 blood vessel endothelial cell proliferation involved in sprouting angiogenesis
Knockout
CRISPR knockout of genes such as VEGFA, KDR, or DLL4 in endothelial cells or animal models can reveal their essential roles in proliferation during sprouting angiogenesis [1,4]. For example, knockout of ephrin-B2 impairs VEGF-induced angiogenesis.
Point Mutation
Introducing point mutations in genes like TEK or BMPR2 can model human vascular diseases and assess the impact on endothelial proliferation [4,8]. This approach helps distinguish between loss-of-function and gain-of-function effects.
Knock-in
Knock-in of fluorescent reporters (e.g., GFP) into endogenous loci allows visualization of proliferating endothelial cells in vivo. Knock-in of patient-specific mutations can model disease phenotypes.
Overexpression
Overexpression of pro-angiogenic factors such as VEGFA or constitutively active receptors can drive excessive endothelial proliferation, modeling pathological angiogenesis [3,4]. This is useful for gain-of-function studies.
How EDITGENE Supports blood vessel endothelial cell proliferation involved in sprouting angiogenesis Research
Researchers studying blood vessel endothelial cell proliferation involved in sprouting angiogenesis-related genes often need to determine whether a candidate gene is causally involved in the process. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell and animal models, enabling functional validation of genes in angiogenesis research.
Contact EDITGENE today to design your custom CRISPR model for blood vessel endothelial cell proliferation involved in sprouting angiogenesis research.
Frequently Asked Questions About blood vessel endothelial cell proliferation involved in sprouting angiogenesis
What is GO:0002043?
GO:0002043 is a Gene Ontology term for the proliferation of blood vessel endothelial cells that contributes to sprouting angiogenesis, the process of new blood vessel formation from existing vessels.
What genes are involved in blood vessel endothelial cell proliferation involved in sprouting angiogenesis?
Key genes include VEGFA, KDR, FLT1, DLL4, NOTCH1, ANGPT2, TEK, PFKFB3, and FGFR1, among others [1,3,4].
How is endothelial cell proliferation regulated during sprouting angiogenesis?
It is regulated by VEGF, Notch, Ang-Tie2, and FGF signaling pathways, as well as metabolic cues such as glycolysis [1,3,4].
What diseases are associated with dysregulated endothelial proliferation in sprouting angiogenesis?
Cancer, diabetic retinopathy, age-related macular degeneration, and ischemic cardiovascular diseases [7,8].
What methods are used to study GO:0002043?
Common methods include single-cell RNA-seq, EdU proliferation assays, in vivo retinal angiogenesis models, and metabolic flux analysis [2,3,4].
How can CRISPR be used to study this process?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional interrogation of genes involved in endothelial proliferation [1,4,6].
What is the role of VEGF in endothelial proliferation?
VEGF-A binding to VEGFR2 activates signaling cascades that drive endothelial cell proliferation during sprouting.
What is the difference between tip and stalk cells?
Tip cells guide the sprout and migrate, while stalk cells proliferate to elongate the vessel; this is regulated by Notch signaling.
How does metabolism affect endothelial proliferation?
Proliferating endothelial cells switch to glycolysis, regulated by FGF signaling and PFKFB3, to support biosynthetic demands.
What models are available to study sprouting angiogenesis?
Mouse retinal angiogenesis, zebrafish intersegmental vessels, and in vitro HUVEC sprouting assays are commonly used [1,3,4].
Conclusion
GO:0002043, blood vessel endothelial cell proliferation involved in sprouting angiogenesis, is a fundamental biological process that underpins vascular development and disease. Understanding its regulation by VEGF, Notch, Ang-Tie2, and metabolic pathways provides insights into angiogenesis-related pathologies and potential therapeutic targets [1,3,4]. Advances in single-cell technologies and CRISPR-based models continue to unravel the complexities of endothelial proliferation, offering new avenues for research and drug discovery [2,6].
References
- 1. Wang Y et al.. 2010. Ephrin-B2 controls VEGF-induced angiogenesis and lymphangiogenesis.. Nature 465(7297):483-6 PMID: 20445537
- 2. Mäe MA et al.. 2021. Single-Cell Analysis of Blood-Brain Barrier Response to Pericyte Loss.. Circ Res 128(4):e46-e62 PMID: 33375813
- 3. Yu P et al.. 2017. FGF-dependent metabolic control of vascular development.. Nature 545(7653):224-228 PMID: 28467822
- 4. Zhang Y et al.. 2021. DPSCs treated by TGF-β1 regulate angiogenic sprouting of three-dimensionally co-cultured HUVECs and DPSCs through VEGF-Ang-Tie2 signaling.. Stem Cell Res Ther 12(1):281 PMID: 33971955
- 5. Gargett CE et al.. 2001. Human endometrial angiogenesis.. Reproduction 121(2):181-6 PMID: 11226042
- 6. Eilken HM et al.. 2010. Dynamics of endothelial cell behavior in sprouting angiogenesis.. Curr Opin Cell Biol 22(5):617-25 PMID: 20817428
- 7. Laurenzana A et al.. 2015. Endothelial Progenitor Cells in Sprouting Angiogenesis: Proteases Pave the Way.. Curr Mol Med 15(7):606-20 PMID: 26321757
- 8. Kulikauskas MR et al.. 2022. The versatility and paradox of BMP signaling in endothelial cell behaviors and blood vessel function.. Cell Mol Life Sci 79(2):77 PMID: 35044529
