GO:1903589 positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis: Signaling Mechanisms, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1903589 describes any process that activates or increases the frequency, rate or extent of blood vessel endothelial cell proliferation specifically during sprouting angiogenesis.
• Sprouting angiogenesis requires coordinated endothelial cell migration and proliferation; positive regulators such as Rap1b and JNK drive these responses.
• Key molecular players include adhesion molecules (beta1 integrin, CD34), junctional proteins (Connexin40), and signaling kinases (JNK, MAPK).
• Dysregulation of this process contributes to endometriosis, ovarian vascular remodeling, and arterial quiescence defects.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of candidate regulators in endothelial cells.
• EDITGENE provides end-to-end services for generating and screening CRISPR models to study GO:1903589-related genes.
Description
Sprouting angiogenesis is the process by which new blood vessels emerge from pre-existing ones, a critical event in development, wound healing, and tumor progression. Central to this process is the proliferation of endothelial cells that form the sprout. The Gene Ontology term GO:1903589, positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis, captures the regulatory events that stimulate this proliferation specifically in the context of sprouting. Understanding this term helps researchers dissect the molecular switches that turn quiescent endothelial cells into proliferative sprout tips. Experimental evidence from knockout and knockdown studies has identified several positive regulators. For example, Rap1b-deficient mice exhibit defective angiogenesis, reduced endothelial migration and proliferation, and impaired MAPK signaling. Similarly, JNK acts as a positive regulator of angiogenic potential in endothelial cells. These findings underscore the importance of precise regulation: too little proliferation leads to insufficient vascularization, while excessive proliferation contributes to pathological angiogenesis in diseases such as endometriosis and cancer. Thus, GO:1903589 serves as a focal point for integrating signaling, adhesion, and transcriptional programs that control endothelial growth during sprouting.
positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis At A Glance
| GO ID | GO:1903589 |
|---|---|
| GO term | positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis |
| Ontology | biological_process |
| Synonym | activation of blood vessel endothelial cell proliferation during sprouting angiogenesis; upregulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis; positive regulation of blood vessel endothelial cell proliferation during sprouting angiogenesis |
| Major function | Stimulates endothelial cell division during the formation of new capillary sprouts |
| Related processes | Sprouting angiogenesis, endothelial cell migration, MAPK signaling, cell adhesion |
| Key regulators | Rap1b, JNK, beta1 integrin, CD34, Connexin40, KLF4 |
| Disease relevance | Endometriosis, ovarian vascular remodeling, arterial quiescence, cancer angiogenesis |
What Is GO:1903589?
GO:1903589 is defined as any process that activates or increases the frequency, rate or extent of blood vessel endothelial cell proliferation involved in sprouting angiogenesis. In other words, it encompasses the positive regulatory inputs—such as growth factor signaling, kinase cascades, and adhesion-dependent cues—that boost the division of endothelial cells specifically when they are forming new sprouts from existing vessels.
Why Is positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis Important in Cell Biology?
GO:1903589 is important because endothelial cell proliferation is a rate-limiting step in sprouting angiogenesis, and its positive regulation ensures adequate vascularization during development and tissue repair. Conversely, excessive or misregulated proliferation underlies pathological angiogenesis in endometriosis, tumors, and other diseases. Studying this term helps identify therapeutic targets to either promote vascular growth in ischemic conditions or inhibit it in angiogenesis-dependent disorders.
• Controls the expansion of endothelial cells at the tip of growing sprouts, determining vessel density.
• Integrates pro-angiogenic signals such as MAPK and JNK pathways.
• Requires adhesion molecules like beta1 integrin for proper sprouting.
• Modulated by junctional proteins such as Connexin40, which influences arterial endothelial quiescence.
• Dysregulated in endometriosis, where hyaluronic acid synthesis supports angiogenesis.
• Plays a role in ovarian vascular remodeling during the estrous cycle.
• CD34 expression affects tube-forming capacity and barrier properties of endothelial colony-forming cells.
• Serves as a target for anti-angiogenic or pro-angiogenic therapies.
• Provides a framework for CRISPR screening to discover novel regulators.
• Links cellular metabolism and signaling to vascular growth.
What Happens During positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis?
Initiation by pro-angiogenic signals
In simple terms: Growth factors and other cues tell endothelial cells to start dividing.
Positive regulation begins when pro-angiogenic stimuli, such as VEGF or other growth factors, activate receptors on endothelial cells. This triggers intracellular signaling cascades, including the MAPK pathway, which promotes proliferation. In Rap1b-deficient mice, defective MAPK signaling correlates with reduced endothelial proliferation and angiogenesis. Similarly, JNK activity is required for angiogenic potential in endothelial cells.
Adhesion-dependent modulation
In simple terms: Cells need to stick to their surroundings to divide properly.
Cell adhesion to the extracellular matrix via integrins is essential for endothelial proliferation during sprouting. Beta1 integrin expression on endothelial cells is required for angiogenesis but not for vasculogenesis, indicating a specific role in sprouting. CD34 expression also modulates tube-forming capacity and barrier properties of endothelial colony-forming cells, influencing proliferative responses.
Junctional and quiescence control
In simple terms: Proteins at cell-cell junctions can put the brakes on proliferation.
Connexin40, induced by KLF4, contributes to arterial endothelial quiescence, thereby limiting proliferation. This suggests that positive regulation of proliferation involves overcoming quiescence signals. The balance between pro-proliferative and quiescence factors determines the extent of sprouting.
Integration with tissue remodeling
In simple terms: Proliferation is coordinated with cycles of vessel growth and regression.
In physiological settings such as the ovary, angiogenesis is cyclic and involves blood vessel regression during luteolysis, with endothelial cell detachment and vessel occlusion. Positive regulation of endothelial proliferation must be tightly coordinated with these regression phases. In pathological conditions like endometriosis, hyaluronic acid synthesis supports angiogenesis, and its inhibition suppresses endothelial proliferation.
Key Genes Involved in GO:1903589 positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis
The following genes and proteins have been experimentally linked to the positive regulation of blood vessel endothelial cell proliferation during sprouting angiogenesis.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Rap1b | Small GTPase; required for endothelial migration, proliferation, and MAPK signaling | Rap1b-deficient mice show defective angiogenesis |
| JNK | Stress-activated kinase; positive regulator of angiogenic potential | JNK inhibition reduces endothelial sprouting |
| ITGB1 (beta1 integrin) | Adhesion receptor; required for angiogenesis but not vasculogenesis | Endothelial-specific knockout impairs sprouting |
| CD34 | Sialomucin; modulates tube formation and barrier properties | CD34 expression affects ECFC proliferation |
| GJA5 (Connexin40) | Gap junction protein; contributes to arterial endothelial quiescence | KLF4-induced Connexin40 limits proliferation |
| KLF4 | Transcription factor; induces quiescence genes | KLF4 overexpression increases Connexin40 and reduces proliferation |
| HAS2 | Hyaluronic acid synthase; supports angiogenesis | Inhibition suppresses angiogenesis in endometriosis |
| MAPK1/3 | Kinases in MAPK pathway; downstream of Rap1b | Defective signaling in Rap1b KO |
| VEGFA | Growth factor; canonical pro-angiogenic signal | Indirectly implicated in proliferation |
| CDH5 (VE-cadherin) | Endothelial junctional protein; regulates permeability and growth | Modulates contact inhibition |
| PECAM1 (CD31) | Adhesion molecule; involved in endothelial cell-cell interactions | Marker of endothelial cells |
| KDR (VEGFR2) | Receptor for VEGF; activates MAPK | Upstream of proliferation |
| TEK (Tie2) | Receptor tyrosine kinase; regulates angiogenesis | Angiopoietin signaling |
| NOS3 (eNOS) | Nitric oxide synthase; modulates vascular tone and growth | Linked to angiogenesis |
| MMP2/9 | Matrix metalloproteinases; remodel ECM during sprouting | Facilitate endothelial invasion |
| PTK2 (FAK) | Focal adhesion kinase; mediates integrin signaling | Downstream of beta1 integrin |
| SRC | Kinase; integrates adhesion and growth factor signals | Potential regulator |
| RHOA | Small GTPase; controls cytoskeleton and migration | Modulates sprouting |
How Is positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis Regulated?
The positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis is controlled by a balance of pro-proliferative and anti-proliferative signals. Key positive regulators include the small GTPase Rap1b, which is required for MAPK activation and endothelial proliferation, and JNK, which promotes angiogenic potential. Adhesion via beta1 integrin provides permissive signals for proliferation during sprouting. Conversely, quiescence factors such as KLF4-induced Connexin40 act as brakes. In pathological contexts, hyaluronic acid synthesis supports proliferation, and its inhibition suppresses angiogenesis. Cyclic angiogenesis in the ovary illustrates physiological regulation, with proliferation coordinated with regression.
positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HAS2 | Endometriosis | HAS2 knockout in endometriotic cell lines or mouse models |
| Rap1b | Defective angiogenesis | Rap1b knockout mice |
| KLF4 | Arterial quiescence | KLF4 overexpression in endothelial cells |
| ITGB1 | Angiogenesis defects | Endothelial-specific beta1 integrin knockout mice |
| CD34 | ECFC tube formation | CD34 knockdown in ECFCs |
Endometriosis
Endometriotic lesions depend on angiogenesis for growth. Inhibition of hyaluronic acid synthesis suppresses angiogenesis in developing endometriotic lesions, reducing endothelial proliferation. This links GO:1903589 to the pathophysiology of endometriosis and suggests that targeting positive regulators could be therapeutic.
Ovarian vascular remodeling
The ovary undergoes cyclic angiogenesis and blood vessel regression. During luteolysis, blood vessel regression involves endothelial cell detachment and vessel occlusion. Positive regulation of endothelial proliferation is essential for the angiogenic phase, and its dysregulation may contribute to ovarian disorders.
Arterial quiescence and vascular disease
KLF4-induced Connexin40 expression contributes to arterial endothelial quiescence, opposing proliferation. Loss of this quiescence mechanism could lead to aberrant arterial endothelial proliferation, relevant to atherosclerosis and other vascular diseases.
Cancer angiogenesis
Although not directly cited in the provided references, the general principle that positive regulation of endothelial proliferation supports tumor angiogenesis is well established. The genes listed here, such as VEGFA and MAPK, are commonly dysregulated in cancer.
From positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate endothelial proliferation during sprouting? | CRISPR knockout in HUVECs or ECFCs followed by proliferation assays |
| Does a specific point mutation in gene X alter its pro-proliferative function? | CRISPR point mutation knock-in in endothelial cells |
| Does tagging gene X with a fluorescent protein affect its localization and function? | CRISPR knock-in of a tag (e.g., GFP) in endothelial cells |
| Does overexpression of gene X enhance sprouting angiogenesis? | CRISPR activation or lentiviral overexpression in endothelial spheroid assays |
| Which genes are essential for endothelial proliferation? | Genome-wide CRISPR knockout library screening in endothelial cells under angiogenic conditions |
| How does gene X regulate MAPK signaling? | Knockout or point-mutant endothelial cells followed by phospho-MAPK Western blotting |
How to Study the positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout + EdU assay | Endothelial cell proliferation | Testing if a gene positively regulates proliferation |
| RNA-seq | Transcriptional changes | Identifying downstream targets of regulators |
| Proteomics | Protein expression and modifications | Detecting MAPK pathway activation |
| Spheroid sprouting assay | Sprout formation and length | Assessing angiogenic capacity |
| Immunofluorescence | Protein localization and proliferation markers | Visualizing Ki-67 or phospho-histone H3 in sprouts |
| Western blot | Phosphorylation of signaling proteins | Measuring MAPK or JNK activity |
| CRISPR library screening | Essential genes for proliferation | Genome-wide discovery of regulators |
| In vivo Matrigel plug assay | Angiogenesis in vivo | Validating pro-angiogenic factors |
CRISPR knockout and proliferation assays
CRISPR-Cas9 knockout of candidate genes in endothelial cells (e.g., HUVECs) followed by EdU incorporation or Ki-67 staining can determine whether a gene positively regulates proliferation. This approach has been used to show that Rap1b deficiency reduces endothelial proliferation.
Transcriptomic and proteomic profiling
RNA-seq and proteomics can identify changes in gene expression upon knockout or overexpression of regulators. For example, KLF4 induction increases Connexin40 expression, which can be detected by RNA-seq.
Imaging of sprouting angiogenesis
Endothelial spheroid sprouting assays and in vivo models (e.g., mouse retina) allow visualization of sprout formation and proliferation. Beta1 integrin knockout impairs angiogenesis in vivo.
Signaling pathway analysis
Western blotting for phospho-MAPK or JNK activity can reveal signaling changes. Rap1b-deficient mice show defective MAPK signaling, and JNK activity is required for angiogenic potential.
How CRISPR Can Be Used to Study GO:1903589 positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis
Knockout
CRISPR knockout of candidate positive regulators (e.g., Rap1b, JNK) in endothelial cells can confirm their requirement for proliferation during sprouting. For instance, Rap1b knockout mice exhibit defective angiogenesis and reduced endothelial proliferation.
Point Mutation
Introducing specific point mutations (e.g., in the GTPase domain of Rap1b) can dissect which domains are essential for its pro-proliferative function. This allows fine mapping of signaling interfaces.
Knock-in
Knock-in of reporter tags (e.g., GFP) or epitope tags into endogenous loci enables real-time tracking of protein localization and interaction in proliferating endothelial cells. This is useful for studying proteins like Connexin40.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can test whether increasing a gene's activity enhances endothelial proliferation and sprouting. For example, KLF4 overexpression induces quiescence, so overexpressing pro-proliferative genes would be expected to boost sprouting.
How EDITGENE Supports positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis Research
Researchers studying positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis-related genes often need to determine whether a candidate gene is causally involved in endothelial proliferation or simply correlated with the process. EDITGENE provides the tools to establish causality through precise genome editing.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis research.
Frequently Asked Questions About positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis
What is GO:1903589?
GO:1903589 is a Gene Ontology term for any process that activates or increases the frequency, rate or extent of blood vessel endothelial cell proliferation involved in sprouting angiogenesis.
What genes are involved in positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis?
Key genes include Rap1b, JNK, ITGB1 (beta1 integrin), CD34, GJA5 (Connexin40), and KLF4, among others.
How is sprouting angiogenesis regulated?
It is regulated by a balance of pro-angiogenic signals (e.g., VEGF, MAPK, JNK) and quiescence factors (e.g., KLF4-induced Connexin40).
What diseases involve dysregulated endothelial proliferation in sprouting angiogenesis?
Endometriosis, ovarian vascular remodeling disorders, and arterial quiescence defects are linked to this process.
What methods are used to study GO:1903589?
CRISPR knockout, RNA-seq, proteomics, spheroid sprouting assays, and in vivo models are commonly used.
Can CRISPR be used to study positive regulators of endothelial proliferation?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of candidate genes.
What is the role of Rap1b in endothelial proliferation?
Rap1b is required for endothelial migration, proliferation, and MAPK signaling; its deficiency leads to defective angiogenesis.
How does JNK regulate angiogenesis?
JNK acts as a positive regulator of angiogenic potential in endothelial cells.
What is the significance of beta1 integrin in sprouting angiogenesis?
Beta1 integrin expression on endothelial cells is required for angiogenesis but not vasculogenesis, highlighting its specific role in sprouting.
How can EDITGENE help my research on GO:1903589?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services to study genes involved in this process.
Conclusion
GO:1903589 captures the positive regulatory events that drive endothelial cell proliferation during sprouting angiogenesis. Through the action of genes such as Rap1b, JNK, and beta1 integrin, this process ensures adequate vascular growth, while its dysregulation contributes to diseases like endometriosis and arterial quiescence defects. CRISPR-based models offer powerful tools to dissect these mechanisms and identify new therapeutic targets.
References
- 1. Olivares CN et al.. 2016. Inhibition of Hyaluronic Acid Synthesis Suppresses Angiogenesis in Developing Endometriotic Lesions.. PLoS One 11(3):e0152302 PMID: 27018976
- 2. Chrzanowska-Wodnicka M et al.. 2008. Defective angiogenesis, endothelial migration, proliferation, and MAPK signaling in Rap1b-deficient mice.. Blood 111(5):2647-56 PMID: 17993608
- 4. Uchida C et al.. 2008. JNK as a positive regulator of angiogenic potential in endothelial cells.. Cell Biol Int 32(7):769-76 PMID: 18455449
- 5. Denis JF et al.. 2019. KLF4-Induced Connexin40 Expression Contributes to Arterial Endothelial Quiescence.. Front Physiol 10:80 PMID: 30809154
- 6. Tasev D et al.. 2016. CD34 expression modulates tube-forming capacity and barrier properties of peripheral blood-derived endothelial colony-forming cells (ECFCs).. Angiogenesis 19(3):325-38 PMID: 27043316
- 7. Modlich U et al.. 1996. Cyclic angiogenesis and blood vessel regression in the ovary: blood vessel regression during luteolysis involves endothelial cell detachment and vessel occlusion.. Lab Invest 74(4):771-80 PMID: 8606487
- 8. Tanjore H et al.. 2008. Beta1 integrin expression on endothelial cells is required for angiogenesis but not for vasculogenesis.. Dev Dyn 237(1):75-82 PMID: 18058911
