Role of Heme Oxygenase-1 in Human Endothelial Cells: Lesson From the Promoter Allelic Variants

• Published in: Arteriosclerosis, thrombosis, and vascular biology Vol. 30; no. 8; pp. 1634 - 1641
• Main Authors: Taha, Hevidar, Skrzypek, Klaudia, Guevara, Ibeth, Nigisch, Anneliese, Mustafa, Stefan, Grochot-Przeczek, Anna, Ferdek, Pawel, Was, Halina, Kotlinowski, Jerzy, Kozakowska, Magdalena, Balcerczyk, Aneta, Muchova, Lucie, Vitek, Libor, Weigel, Guenter, Dulak, Jozef, Jozkowicz, Alicja
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA American Heart Association, Inc 01-08-2010; Lippincott Williams & Wilkins
• Subjects: Alleles; Atherosclerosis (general aspects, experimental research); Biological and medical sciences; Blood and lymphatic vessels; Blood vessels and receptors; Cardiology. Vascular system; Cell Proliferation; Cell Survival; Cells, Cultured; Cytoprotection; Dinucleotide Repeats; Diseases of the peripheral vessels. Diseases of the vena cava. Miscellaneous; Endothelial Cells - enzymology; Endothelial Cells - immunology; Enzyme Induction; Fundamental and applied biological sciences. Psychology; Genetic Variation; Genotype; Glutathione - metabolism; Guanine; Heme Oxygenase-1 - biosynthesis; Heme Oxygenase-1 - genetics; Heme Oxygenase-1 - metabolism; Humans; Infant, Newborn; Inflammation Mediators - metabolism; Medical sciences; Neovascularization, Physiologic; Oxidative Stress; Phenotype; Promoter Regions, Genetic; RNA, Messenger - metabolism; Thymine; Vascular Endothelial Growth Factor A - metabolism; Vertebrates: cardiovascular system; Human; Endothelial cell; growth factors; Enzyme; antioxidants; Cytokine; Cardiovascular disease; Antioxidant; Endothelium; Vascular disease; Oxygenase; Angiogenesis; Atherosclerosis; cytokines; Oxidoreductases; Growth factor
• ISSN: 1079-5642; 1524-4636
• DOI: 10.1161/ATVBAHA.110.207316

OBJECTIVE—Heme oxygenase-1 (HO-1) is an antioxidative, antiinflammatory, and cytoprotective enzyme that is induced in response to cellular stress. The HO-1 promoter contains a (GT)n microsatellite DNA, and the number of GT repeats can influence the occurrence of cardiovascular diseases. We elucidated the effect of this polymorphism on endothelial cells isolated from newborns of different genotypes.
METHODS AND RESULTS—On the basis of HO-1 expression, we classified the HO-1 promoter alleles into 3 groupsshort (S) (most active, GT ≤23), medium (moderately active, GT=24 to 28), and long (least active, GT ≥29). The presence of the S allele led to higher basal HO-1 expression and stronger induction in response to cobalt protoporphyrin, prostaglandin-J2, hydrogen peroxide, and lipopolysaccharide. Cells carrying the S allele survived better under oxidative stress, a fact associated with the lower concentration of oxidized glutathione and more favorable oxidative status, as determined by measurement of the ratio of glutathione to oxidized glutathione. Moreover, they proliferated more efficiently in response to vascular endothelial growth factor A, although the vascular endothelial growth factor–induced migration and sprouting of capillaries were not influenced. Finally, the presence of the S allele was associated with lower production of some proinflammatory mediators, such as interleukin-1β, interleukin-6, and soluble intercellular adhesion molecule-1.
CONCLUSION—The (GT)n promoter polymorphism significantly modulates a cytoprotective, proangiogenic, and antiinflammatory function of HO-1 in human endothelium.