Bioregenerative Engineering Principles and Applications - Shu Q. Liu
..pdf706 VASCULAR REGENERATIVE ENGINEERING
method is superior to that with a metal band described above in terms of controlling the accuracy of arterial constriction.
Conventional Treatment of Hypertension [15.23]. The principle of hypertension treatment is to remove factors that cause hypertension and to reduce arterial blood pressure. As discussed on page 700 of this chapter, renovascular hypertension is caused by renal arterial stenosis. Surgical correction of stenosed renal arteries is usually an effective treatment. Endocrine hypertension may be caused by adrenal gland tumors, which induce excessive secretion of aldosterone (in the case of a cortical tumor) or epinephrine and norepinephrine (in the case of a medulla tumor). Surgical removal of the tumor usually results in a decrease in arterial blood pressure. For essential hypertension, since the causes are poorly understood, there are no effective approaches for the removal of the pathogenic factors.
An increase in arterial blood pressure usually stimulates mitogenic responses of vascular endothelial and smooth muscle cells and enhances atherogenesis. Thus, excessive hypertension should be controlled appropriately. There are two approaches that can be used to reduce arterial blood pressure: diuresis and vasodilation. Diuresis can be induced by agents known as diuretics, which enhance the excretion of water in the kidney. Typical diuretic agents are thiazide derivatives. These agents inhibit the reabsorption of sodium and potassium in the proximal renal tubules and stimulate the secretion of chloride, enhancing water excretion and reducing arterial blood pressure.
Vasodilators are agents that induce the relaxation of vascular smooth muscle cells and thus the reduction of blood pressure. There are several types of vasodilators: blockers of the α adrenergic receptor, suppressors of sympathetic vasomotor centers, blockers of the angiotensin II type 1 receptor, and blockers of calcium channels. The α-adrenergic receptor mediates norepinephrine-induced smooth muscle cell contraction and its activation induces an elevation in arterial blood pressure. The inhibition of the α adrenergic receptor can effectively reduce arterial blood pressure. Typical agents of α adrenergic receptor blockers include phentolamine and phenoxybenzamine. The sympathetic vasomotor centers control the basal tone of small arteries. An increase in the basal tone is a critical factor that contributes to hypertension. Several agents, such as clonidine and methyldopa, can be used to suppress the activity of the sympathetic vasomotor centers and reduce arterial blood pressure. The angiotensin II type 1 receptor mediates angiotensin II-induced contraction of smooth muscle cells. The suppression of the activity of this receptor reduces arterial blood pressure. A typical agent for such a purpose is losartan. Calcium is necessary for vascular smooth muscle contraction. The blockade of calcium channels leads to a reduction in the contractility of smooth muscle cells. Commonly used calcium blockers include nicardipine, nifedipine, nimodipine, and verapamil.
Molecular Engineering [15.24]. While hypertension is commonly treated with agents as described above, these agents are short-lived and often elicit side effects. Since the pathogenesis of hypertension, especially, essential hypertension, is related to the disorder of vascular control genes, the modulation of these genes provides a means for the treatment of hypertension. Strategies for molecular manipulation of hypertension are to enhance the expression of vasodilator genes and suppress the expression of vasoconstrictor genes. There are several basic approaches for achieving the therapeutic goals, including application of full-length DNA and antisense oligonucleotides. These genetic materials can be directly delivered into the blood. Potential genes and oligodeoxynucleotides for these purposes are described as follows.
708
TABLE 15.6. Characteristics of Selected Vasodilating Molecules*
|
|
Amino |
Molecular |
|
|
Proteins |
Alternative Names |
Acids |
Weight (kDa) |
Expression |
Functions |
|
|
|
|
|
|
Atrial natriuretic |
Natriuretic peptide precursor A |
151 |
16 |
Atrium, prostate gland |
Inducing smooth muscle relaxation, |
peptide |
(NPPA), atrial natriuretic |
|
|
|
stimulating water and sodium |
|
polypeptide (ANP), |
|
|
|
excretion, enhancing endothelial |
|
prepronatriodilatin, |
|
|
|
regeneration, and regulating the |
|
cardionatrin, atrionatriuretic |
|
|
|
activity of NFκB |
|
factor (ANF), pronatriodilatin |
|
|
|
|
|
(PND), atriopeptin |
|
|
|
|
Kallikrein |
KLK1, renaL/pancreatic/salivary |
262 |
29 |
Prostate gland, uterus |
One of the 15 kallikrein subfamily |
|
kallikrein, KLKR, kallikrein |
|
|
|
members that cleaves kininogens to |
|
serine protease 1 |
|
|
|
produce bradykinin and |
|
KNG, α2-thiol proteinase |
|
|
|
lysylbradykinin |
Kininogen |
427 |
48 |
Liver, blood vessels, platelets, |
Precursor of kinins (bradykinin and |
|
|
inhibitor |
|
|
kidney, placenta |
lysylbradykinin) |
|
|
|
|
|
|
*Based on bibliography 15.26.
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Plasminogen
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712 VASCULAR REGENERATIVE ENGINEERING
Swaisgood CM, Schmitt D, Eaton D, Plow EF: In vivo regulation of plasminogen function by plasma carboxypeptidase, Br J Clin Invest 110:1275–82, 2002.
Protein C
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Drews R, Paleyanda RK, Lee TK, Chang RR, Rehemtulla A et al: Proteolytic maturation of protein C upon engineering the mouse mammary gland to express furin, Proc Natl Acad Sci USA 92:10462–6, 1995.
Dreyfus M, Magny JF, Bridey F, Schwarz HP, Planche C et al: Treatment of homozygous protein C deficiency and neonatal purpura fulminans with a purified protein C concentrate, New Engl J Med 325:1565–8, 1991.
Faust SN, Levin M, Harrison OB, Goldin RD, Lockhart MS et al: Dysfunction of endothelial protein C activation in severe meningococcal sepsis, New Engl J Med 345:408–16, 2001.
Hasstedt SJ, Bovill EG, Callas PW, Long GL: An unknown genetic defect increases venous thrombosis risk, through interaction with protein C deficiency, Am J Hum Genet 63:569–76, 1998.
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Von Willebrand Factor
Mancuso DJ, Tuley EA, Westfield LA, Worrall NK, Shelton-Inloes BB et al: Structure of the gene for human von Willebrand factor, J Biol Chem 264:19514–27, 1989.
Sadler JE, Shelton-Inloes BB, Sorace JM, Harlan JM, Titani K et al: Cloning and characterization of two cDNAs coding for human von Willebrand factor, Proc Natl Acad Sci USA 82:6394–8, 1985.
Mancuso DJ, Tuley EA, Westfield LA, Lester-Mancuso TL, Le Beau MM et al: Human von Willebrand factor gene and pseudogene: structural analysis and differentiation by polymerase chain reaction, Biochemistry 30:253–69, 1991.
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Lynch DC, Zimmerman TS, Collins CJ, Brown M, Morin MJ et al: Molecular cloning of cDNA for human von Willebrand factor: Authentication by a new method, Cell 41:49–56, 1985.
Emsley J, Cruz M, Handin R, Liddington R: Crystal structure of the von Willebrand factor A1 domain and implications for the binding of platelet glycoprotein Ib, J Biol Chem 273:10396–401, 1998.
Tuley EA, Gaucher C, Jorieux S, Worrall NK, Sadler JE et al: Expression of von Willebrand factor “Normandy”: an autosomal mutation that mimics hemophilia A, Proc Natl Acad Sci USA 88:6377–81, 1991.
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Tissue Thromboplastin
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Erlich J, Parry GCN, Fearns C, Muller M, Carmeliet P et al: Tissue factor is required for uterine hemostasis and maintenance of the placental labyrinth during gestation, Proc Natl Acad Sci USA 96:8138–43, 1999.
Isermann B, Sood R, Pawlinski R, Zogg M, Kalloway S et al: The thrombomodulin-protein C system is essential for the maintenance of pregnancy, Nature Med 9:331–7, 2003.
Pawlinski R, Fernandes A, Kehrle B, Pedersen B, Parry G et al: Tissue factor deficiency causes cardiac fibrosis and left ventricular dysfunction, Proc Natl Acad Sci USA 99:15333–8, 2002.
Toomey JR, Kratzer KE, Lasky NM, Broze GJ, Jr: Effect of tissue factor deficiency on mouse and tumor development, Proc Natl Acad Sci USA 94:6922–6, 1997.
Prothrombin
Banfield DK, MacGillivray RTA: Partial characterization of vertebrate prothrombin cDNAs: Amplification and sequence analysis of the B chain of thrombin from nine different species,
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Gehring NH, Frede U, Neu-Yilik G, Hundsdoerfer P, Vetter B et al: Increased efficiency of mRNA 3-prime end formation: a new genetic mechanism contributing to hereditary thrombophilia, Nature Genet 28:389–92, 2001.
Martinelli I, Sacchi E, Landi G, Taioli E, Duca F et al: High risk of cerebral-vein thrombosis in carriers of a prothrombin-gene mutation and in users of oral contraceptives, New Engl J Med 338:1793–7, 1998.
714 VASCULAR REGENERATIVE ENGINEERING
Sun WY, Witte DP, Degen JL, Colbert MC, Burkart MC et al: Prothrombin deficiency results in embryonic and neonatal lethality in mice, Proc Natl Acad Sci USA 95:7597–602, 1998.
Fibrinogen
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Drew AF, Liu H, Davidson JM, Daugherty CC, Degen JL: Wound-healing defects in mice lacking fibrinogen, Blood 97:3691–8, 2001.
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Kant JA, Fornace AJ Jr, Saxe D, Simon MI, McBride OW et al: Evolution and organization of the fibrinogen locus on chromosome 4: gene duplication accompanied by transposition and inversion, Proc Natl Acad Sci USA 82:2344–8, 1985.
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15.3. Regulation of Vascular Contractility
Endothelin 1
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Kurihara Y, Kurihara H, Oda H, Maemura K, Nagai R et al: Aortic arch malformations and ventricular septal defect in mice deficient in endothelin-1, J Clin Invest 96:293–300, 1995.
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Yanagisawa H, Hammer RE, Richardson JA, Williams SC, Clouthier DE et al: Role of endothelin- 1/endothelin-A receptor-mediated signaling pathway in the aortic arch patterning in mice, J Clin Invest 102:22–33, 1998.
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Endothelin 2
Arinami T, Ishikawa M, Inoue A, Yanagisawa M, Masaki T et al: Chromosomal assignments of the human endothelin family genes: The endothelin-1 gene (EDN1) to 6p23-p24, the endothelin- 2 gene (EDN2) to 1p34, and the endothelin-3 gene (EDN3) to 20q13.2-q13.3, Am J Hum Genet 48:990–6, 1991.
Bloch KD, Hong CC, Eddy RL, Shows TB, Quertermous T: cDNA cloning and chromosomal assignment of the endothelin 2 gene: Vasoactive intestinal contractor peptide is rat endothelin 2, Genomics 10:236–42, 1991.
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Ohkubo S, Ogi K, Hosoya M, Matsumoto H, Suzuki N et al: Specific expression of human endo- thelin-2 (ET-2) gene in a renal adenocarcinoma cell line: Molecular cloning of cDNA encoding the precursor of ET-2 and its characterization, FEBS Lett 274:136–40, 1990.
Endothelin 3
Arinami T, Ishikawa M, Inoue A, Yanagisawa M, Masaki T et al: Chromosomal assignments of the human endothelin family genes: the endothelin-1 gene (EDN1) to 6p23–p24, the endothelin- 2 gene (EDN2) to 1p34, and the endothelin-3 gene (EDN3) to 20q13.2–q13.3, Am J Hum Genet 48:990–6, 1991.
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