Related Experiment Video
Updated: Jul 19, 2026
09:23
Isolation of Microvascular Endothelial Tubes from Mouse Resistance Arteries
Published on: November 25, 2013
Endothelial cells protect vascular smooth muscle cells from H2O2 attack
1Denver Health Medical Center, Colorado, USA.
The American Journal of Physiology
|June 1, 1997
Summary
Endothelial cells protect vascular smooth muscle cells from oxidant injury via catalase and nitric oxide. This protection is crucial for preventing kidney damage during reperfusion following ischemia.
Area of Science:
- Vascular Biology
- Renal Physiology
- Cellular Toxicology
Background:
- Ischemic acute renal failure alters endothelial-dependent vascular responses.
- Reperfusion oxidants injure renal microvasculature, hindering kidney function recovery.
Purpose of the Study:
- To investigate if endothelial cells (EC) modulate oxidant attack on vascular smooth muscle cells (VSMC).
- To elucidate the mechanisms by which EC protect VSMC from oxidant-induced injury.
Main Methods:
- Coincubation of rat mesenteric artery VSMC with bovine pulmonary artery EC.
- Assessment of VSMC injury via [3H]adenine release following hydrogen peroxide (H2O2) exposure.
- Experimental manipulation of EC with aminotriazole, N omega-nitro-L-arginine (L-NNA), and interleukin-1 beta (IL-1 beta).
Main Results:
- EC significantly reduced H2O2-mediated VSMC injury.
- EC protection was dependent on luminal oxidant exposure and involved catalase activity.
- Nitric oxide (NO) production by EC contributed to the protective effect, which was enhanced by IL-1 beta treatment.
Conclusions:
- Endothelial cells protect VSMC from luminal oxidant attack through catalase- and NO-dependent mechanisms.
- EC dysfunction may contribute to renal injury from oxidants during ischemic kidney reperfusion.
- Targeting EC protective mechanisms could be a therapeutic strategy for ischemic renal injury.
Related Concept Videos
01:20Overview 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...
01:10Mechanism of Angiogenesis
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...
01:24Regulation 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...
01:16Vascular Spasm
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
01:15Structure of Blood Vessels
Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...