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Regulation of Angiogenesis and Blood Supply

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

Mechanism of Angiogenesis

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Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...

Overview of the Vascular System

Overview of the Vascular System

The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...

Disorders of Hemostasis

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
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Development of Blood Vessels

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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Anastomoses

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Related Experiment Video

Updated: May 19, 2026

A Patient-Derived Xenograft Model for Venous Malformation

A Patient-Derived Xenograft Model for Venous Malformation

Published on: June 15, 2020

GI-Associated Hemangiomas and Vascular Malformations.

¹Division of Colon and Rectal Surgery, Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, California.

Clinics in Colon and Rectal Surgery

|September 4, 2012

Summary

Gastrointestinal hemangiomas and vascular malformations cause bleeding and are often misdiagnosed. Diagnosis and treatment involve imaging, surgery, or endoscopic methods, prioritizing sphincter preservation.

Keywords:

Hemangioma blue rubber bleb cavernous hemangioma vascular malformation

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Area of Science:

Gastroenterology
Vascular Surgery

Background:

Hemangiomas and vascular malformations are rare gastrointestinal (GI) entities.
They manifest as overt or occult bleeding and can be widespread or focal, often in the rectosigmoid region.
Misdiagnosis is frequent despite characteristic imaging findings like phleboliths and endoscopic appearance.

Purpose of the Study:

To review the diagnostic and therapeutic strategies for GI hemangiomas and vascular malformations.
To highlight the challenges in diagnosis and the available treatment options.

Main Methods:

Review of clinical presentations, diagnostic imaging (plain film, CT, MRI, endorectal ultrasound with Doppler), and treatment modalities.
Emphasis on surgical resection and endoscopic interventions.

Main Results:

Characteristic radiographic features include radiolucent phleboliths.
Endoscopy may reveal a purplish nodule.
Adjunctive imaging (CT, MRI) is crucial due to potential local invasion.
Endorectal ultrasound with Doppler can be beneficial.

Conclusions:

Accurate diagnosis requires a combination of clinical suspicion and advanced imaging.
Surgical resection is the primary treatment, focusing on sphincter preservation.
Endoscopic treatments like banding and sclerotherapy offer successful alternatives for unresectable cases.