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Bordallo C, Rubín JM, Varona AB, Cantabrana B, Hidalgo A, Sánchez M. Increases in ornithine decarboxylase activity in the positive inotropism induced by androgens in isolated left atrium of the rat. Eur J Pharmacol 2001; 422:101-7. [PMID: 11430920 DOI: 10.1016/s0014-2999(01)01039-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
It is well established that the intracellular receptors of androgens act as transcription factors upon their activation by androgen binding. However, a growing number of studies have associated androgens with rapid biological responses independent of their classical action mechanism. In this sense, 5alpha- and 5beta-dihydrotestosterone elicited a rapid positive inotropism in the isolated left atrium of the rat via cAMP-dependent mechanisms that may involve genomic effects. In addition, polyamines are mediators of several biological actions including those acute and long-term effects induced by androgens in the heart. The present study analyzed the role of polyamine synthesis in the cardiotonic effect of androgens in the left atrium of male Wistar rats, electrically stimulated (0.5 Hz, 5 ms and supramaximal voltage) and placed in an organ bath in 10 ml of Tyrode's solution. Incubation in the organ bath with an inhibitor of ornithine decarboxylase activity, alpha-difluoromethylornithine 10 mM, significantly decreased the positive inotropism induced by 5alpha- and 5beta-dihydrotestosterone (0.1-100 microM). This suggests that ornithine decarboxylase seems to be involved in androgen-induced positive inotropism. Furthermore, 6-min exposure to 5alpha- or 5beta-dihydrotestosterone significantly increased the activity of ornithine decarboxylase from 61.81+/-7.53 (control) to 93.28+/-9.45 and 80.28+/-12 pmol/h/mg of protein, respectively. Northern blot analysis showed that 5alpha- and 5beta-dihydrotestosterone did not modify the level of expression of the ornithine decarboxylase gene. Therefore, our results suggest that polyamine synthesis might be involved in the positive inotropism elicited by androgens through the stimulation of ornithine decarboxylase activity without changes in the expression of the ornithine decarboxylase gene.
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Affiliation(s)
- C Bordallo
- Departamento de Bioquímica y Biología Molecular, Universidad de Oviedo, Oviedo, Spain
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2
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Lipke DW, Newman PS, Tofiq S, Guo H, Arcot SS, Aziz SM, Olson JW, Soltis EE. Multiple polyamine regulatory pathways control compensatory cardiovascular hypertrophy in coarctation hypertension. Clin Exp Hypertens 1997; 19:269-95. [PMID: 9107437 DOI: 10.3109/10641969709080819] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
While a number of factors may initiate structural alterations within the cardiovascular system in response to hypertension, there are obligate cellular signaling mechanisms, such as the polyamines, through which they must operate. This study examined the effects of polyamine synthesis inhibition using eflornithine, a suicide inhibitor of ornithine decarboxylase on blood pressure, compensatory remodeling of the cardiovascular system, and cardiac and aortic polyamine contents using an aortic coarctation model in rats. Eflornithine treatment failed to reduce carotid arterial blood pressure and actually significantly elevated vascular pressure above and below the coarctation site by 14 days of hypertension. Eflornithine only transiently reduced aortic polyamine content of hypertensive rats while this agent reduced coarctation-induced aortic medial wall thickening and the synthesis/deposition of fibronectin and laminin in the hypertensive aorta. Increases in left ventricular mass and polyamine content were concomitantly reduced in hypertensive rats administered eflornithine. These results suggest that multiple polyamine regulatory pathways may maintain vascular polyamine content in response to aortic coarctation; however de novo polyamine synthesis is essential for select aspects of vascular remodeling, including matrix synthesis. Cardiac tissue, in contrast, may rely principally on de novo polyamine synthesis.
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MESH Headings
- Animals
- Aorta, Abdominal/drug effects
- Aorta, Abdominal/metabolism
- Aorta, Abdominal/pathology
- Aortic Coarctation/complications
- Aortic Coarctation/metabolism
- Aortic Coarctation/pathology
- Aortic Coarctation/physiopathology
- Blood Pressure/drug effects
- Blood Pressure/physiology
- Blotting, Northern
- Eflornithine/pharmacology
- Enzyme Inhibitors/pharmacology
- Fibronectins/antagonists & inhibitors
- Hyperplasia/metabolism
- Hypertension/etiology
- Hypertension/metabolism
- Hypertension/pathology
- Hypertension/physiopathology
- Hypertrophy, Left Ventricular/etiology
- Hypertrophy, Left Ventricular/metabolism
- Hypertrophy, Left Ventricular/pathology
- Hypertrophy, Left Ventricular/physiopathology
- Immunohistochemistry
- Laminin/antagonists & inhibitors
- Male
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocardium/metabolism
- Ornithine Decarboxylase Inhibitors
- Polyamines/antagonists & inhibitors
- Rats
- Rats, Sprague-Dawley
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Affiliation(s)
- D W Lipke
- Division of Pharmacology and Experimental Therapeutics College of Pharmacy, University of Kentucky Lexington 40536, USA
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3
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Prosser FH, Wahl LM. Involvement of the ornithine decarboxylase pathway in macrophage collagenase production. Arch Biochem Biophys 1988; 260:218-25. [PMID: 2829727 DOI: 10.1016/0003-9861(88)90443-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Definition of the cellular events involved in the production of collagenase by macrophages following activation has revealed prostaglandin E2 (PGE2)- and cAMP-dependent steps. Since ornithine decarboxylase (ODC), the rate-limiting enzyme in polyamine synthesis, is regulated by cAMP and is associated with certain aspects of protein synthesis, the potential role of this enzyme and its polyamine product, putrescine, in collagenase synthesis was examined. Lipopolysaccharide (LPS) activation of macrophages resulted in a maximal ODC response after 6 to 9 h with a 10- to 12-fold elevation in enzyme activity. This elevation in ODC appeared to be regulated by PGE2 since indomethacin inhibited LPS-induced macrophage ODC levels by 70%. Associated with the indomethacin-mediated inhibition of ODC was a loss of collagenase synthesis. Furthermore, partial restoration of collagenase production in indomethacin-inhibited cultures could be achieved by the addition of putrescine. In additional studies alpha-difluoromethylornithine (DFMO), an irreversible inhibitor of ODC, also inhibited collagenase production when added to LPS-treated macrophages. This inhibition by DFMO could be reversed by the exogenous addition of putrescine. These findings demonstrate that the ODC pathway is an important intracellular component in the sequence of events that lead to macrophage collagenase synthesis.
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Affiliation(s)
- F H Prosser
- Laboratory of Microbiology and Immunology, National Institute of Dental Research, Bethesda, Maryland 20892
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Nelson CA, Katovich MJ, Baker SP. Beta-adrenergic responsiveness and cardiac autonomic receptors after implantation of the MtTW15 pituitary adenoma in the rat. Biochem Pharmacol 1987; 36:1297-302. [PMID: 3036164 DOI: 10.1016/0006-2952(87)90085-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The effects of chronic MtTW15 pituitary adenoma implantation on beta-adrenergic responsiveness, cardiac beta-adrenoreceptors, and muscarinic receptors were studied in the rat. Five weeks after s.c. administration of tissue fragments of the MtTW15 adenoma, there was a 51 and 20% increase in the heart weight and body weight, respectively, and a 49-fold increase in the serum prolactin level as compared to the controls. At this time there was also an attenuation in the adenoma-bearing group of the ability of isoproterenol to produce a dipsogenic response and to increase the heart rate. In contrast, isoproterenol stimulated cardiac ornithine decarboxylase (ODC) activity 4.2-fold in both the control and adenoma-bearing groups. There was no change between the two groups in the cardiac ventricular beta-adrenoreceptor or muscarinic receptor concentration as measured by specific (-)-[125I]iodocyanopindolol (CYP) and (-)-[3H]quinuclidinyl benzilate (QNB) respectively. In addition, the concentrations of isoproterenol and carbachol required to inhibit by 50% (IC50) [125I]CYP and [3H]QNB binding, respectively, in the absence of 5'-guanylylimidodiphosphate (Gpp(NH)p) were not different between the two groups. In the presence of Gpp(NH)p, the isoproterenol IC50 value was not different between the two groups, whereas the carbachol IC50 value was increased slightly in the adenoma-bearing group. The data indicate that chronic MtTW15 adenoma implantation attenuated beta-mediated dipsogenic and heart rate responses but had little or no effect on cardiac ODC activity or cardiac autonomic receptor concentrations and agonist binding properties.
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Bazzani C, Genedani S, Bertolini A. Effect of polyamines on perfused rat heart contractility. PHARMACOLOGICAL RESEARCH COMMUNICATIONS 1986; 18:503-12. [PMID: 3737659 DOI: 10.1016/0031-6989(86)90170-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The influence of polyamines (putrescine, spermidine and spermine) on heart contractility was studied using perfused rat ventricle strips (2 X 10 mm), electrically driven at 1 Hz. Putrescine (100 microM) caused a negative inotropic effect gradually increasing in intensity, whereas spermidine and spermine (10 and 100 microM) caused a sharp, positive inotropic effect, followed by a rapid and more marked fall. The possibility that these effects of polyamines on heart contractility may be due to their role in Ca++ fluxes and mobilization, and in membrane functions, is discussed.
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Abstract
In three models of cardiac hypertrophy the significance of catecholamines and the adenylate cyclase-cyclic AMP-system was examined. Two approaches were utilized: 1. The time course of cyclic AMP alterations was correlated with the changes in adenine nucleotide and protein biosynthesis. 2. The effect of beta-receptor blockade on the obligatory increase in adenine nucleotide and protein synthesis was evaluated. In isoproterenol-elicited cardiac hypertrophy, the elevation of the cyclic AMP content was one of the earliest metabolic alterations preceding the enhancement of the biosynthesis of adenine nucleotides and proteins. beta-Receptor blockade with propranolol abolished the increase in adenine nucleotide synthesis. In pressure-induced cardiac hypertrophy due to constriction of the abdominal aorta, catecholamines and the adenylate cyclase-cyclic AMP-system were found not to play a significant role. In triiodothyronine-elicited hypertrophy, the cyclic AMP level was increased very early, but beta-receptor blockade did not prevent hypertrophy nor the enhancement of cardiac adenine nucleotide biosynthesis, although the positive chronotropic and inotropic effects of triiodothyronine were abolished. This result can best be interpreted to indicate a direct effect of triiodothyronine on myocardial carbohydrate metabolism including the pentose phosphate pathway.
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7
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Flamigni F, Guarnieri C, Caldarera CM. Heart ornithine decarboxylase from control and isoproterenol-treated rats: kinetic properties, multiple forms and subcellular distribution. GENERAL PHARMACOLOGY 1986; 17:31-6. [PMID: 3081402 DOI: 10.1016/0306-3623(86)90007-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Heart ornithine decarboxylase (ODC) from isoproterenol treated rats was compared to heart ODC from control rats. Isoproterenol administration did not significantly change Km for ornithine, but it induced a marked increase of Vmax, X Km for pyridoxal phosphate (PLP) was somewhat reduced. Both Kornm and Vmax were a function of the dithiothreitol (DTT) concentration, in a similar way for control and stimulated enzyme. Two ODC forms were detected by ion exchange chromatography in both control and isoproterenol treated hearts. In control heart, ODC specific activity was high in cytosol and nucleoli. Isoproterenol administration induced a remarkable increase of the cytosolic enzyme only.
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8
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Bazzani C, Genedani S, Bertolini A. Effect of polyamines on perfused rat heart contractility. PHARMACOLOGICAL RESEARCH COMMUNICATIONS 1985; 17:873-81. [PMID: 4059321 DOI: 10.1016/0031-6989(85)90046-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The influence of polyamines (putrescine, spermidine and spermine) on heart contractility was studied using perfused rat ventricle strips (2 X 10 mm), electrically driven at 1 Hz. Putrescine (100 microM) caused a negative inotropic effect gradually increasing in intensity, whereas spermidine and spermine (10 and 100 microM) caused a sharp, positive inotropic effect, followed by a rapid and more marked fall. The possibility that these effects of polyamines on heart contractility may be due to their role in Ca++ fluxes and mobilization, and in membrane functions, is discussed.
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9
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Larson DF, Copeland JG, Russell DH. Catecholamine-induced cardiac hypertrophy in a denervated, hemodynamically non-stressed heart transplant. Life Sci 1985; 36:2477-89. [PMID: 3159947 DOI: 10.1016/0024-3205(85)90144-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Studies of stress-induced cardiac hypertrophy suggest that myocardial mass is regulated by the circulating level of epinephrine. The trophic effect is mediated by cardiac beta-adrenergic receptors, and in the murine, rat, and dog heart, specifically by beta 2-adrenergic receptors. The well-characterized functional effects of catecholamines on heart have obscured their role as myocardial trophic hormones. Therefore, we compared the effect of beta-adrenergic receptor stimulation on the myocardial mass of both a working innervated heart and an essentially nonworking denervated heterotopically transplanted heart in the same rat; in this model, the neural and stretch parameters are nonoperational in the transplanted heart. Ornithine decarboxylase (ODC), an enzyme elevated in a dose-dependent manner in heart by isoproterenol, was assayed in both hearts to determine the relationship between ODC activity and myocardial mass in response to isoproterenol administration in working, innervated heart compared to denervated, nonworking heart. In both recipient and donor heart, the myocardial mass paralleled the ability of an isoproterenol bolus to stimulate ODC in the respective heart. However, beta-adrenergic receptor activity in the donor heart was decreased 5 days after transplantation as assessed by the differential ability of a single dose of isoproterenol to stimulate ODC activity. Beta-receptor coupling to ODC activity in the donor heart exceeded that of the recipient heart at 10 days posttransplantation suggesting a time-dependent elevation of beta-adrenergic receptor activity in donor heart. At all times, alterations in myocardial mass paralleled beta-adrenoceptor activity as assessed by the ability of isoproterenol administration to elevate ODC activity. The results support the concept that myocardial mass is regulated by the level of circulating hormones, particularly epinephrine.
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10
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Russell DH. Ornithine decarboxylase: a key regulatory enzyme in normal and neoplastic growth. Drug Metab Rev 1985; 16:1-88. [PMID: 3905315 DOI: 10.3109/03602538508991430] [Citation(s) in RCA: 178] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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11
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Tatár-Kiss S, Bardócz S, Kertai P. Changes in L-ornithine decarboxylase activity in regenerating lung lobes. FEBS Lett 1984; 175:131-4. [PMID: 6479330 DOI: 10.1016/0014-5793(84)80585-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Growth of regenerating lung lobes is preceded by an increase of the activity of L-ornithine decarboxylase (ODC). Mechanical factors play a role in determining both the growth rate and enhancement of activity of ODC in regenerating lung lobes. Hormonal regulation also appears of importance as shown by the increased ODC activity in a transplanted lobe.
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12
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13
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Boucek RJ, Olson RD, Boerth RC. Relationship between the in-situ activity of ornithine decarboxylase and contractile function of the rabbit papillary muscle. Basic Res Cardiol 1983; 78:631-43. [PMID: 6661159 DOI: 10.1007/bf01907210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The relationship between isometric contraction and myocardial ornithine decarboxylase (ODC; EC.4.1.1.17) activity was studied in right ventricular papillary muscles isolated from rabbits. ODC specific activity and polyamine content were significantly increased in papillary muscles contracting isometrically 90 times per minute at the apex of the length-tension relationship for 4 to 5 hours when compared with paired non-contracting muscles or isometrically contracting muscles stimulated at 30 times per min. The increase in ODC activity appeared to be due to new protein synthesis since cycloheximide blocked the increase in ODC activity without affecting isometric function. Thus, the present results suggest that increased contractile demands of the heart may stimulate the synthesis of myocardial ODC, increase ODC activity and polyamine content.
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14
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Johnson MD, Grignolo A, Kuhn CM, Schanberg SM. Hypertension and cardiovascular hypertrophy during chronic catecholamine infusion in rats. Life Sci 1983; 33:169-80. [PMID: 6223191 DOI: 10.1016/0024-3205(83)90410-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Chronic continuous infusion of norepinephrine (NE) or epinephrine (Epi) subcutaneously in rats resulted in rapid elevation of systolic blood pressure (SBP) by 40 mm Hg. Pressure remained high for the duration of the infusion but rapidly returned to control levels after its termination. Pronounced hypertrophy of the thoracic aorta, abdominal aorta and heart was evident within 2 days of the initiation of NE infusion and a plateau was attained by 5 days of infusion. The activity of tissue ornithine decarboxylase (ODC), the rate limiting enzyme in polyamine biosynthesis, was elevated preceeding the onset of tissue hypertrophy, and returned to control levels coincidentally with the cessation of accelerated tissue growth. It is concluded that high blood pressure in this animal model of hypertension is dependent upon the continued presence of exogenous catecholamine, and that pronounced cardiovascular hypertrophy per se is not sufficient to maintain the hypertension. The elevation and decline of vascular ODC activity is consistent with reports that in other tissues an elevation of ODC activity is an obligatory early event in hypertrophy.
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15
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Perin A, Sessa A, Desiderio MA. Polyamine levels and diamine oxidase activity in hypertrophic heart of spontaneously hypertensive rats and of rats treated with isoproterenol. BIOCHIMICA ET BIOPHYSICA ACTA 1983; 755:344-51. [PMID: 6218830 DOI: 10.1016/0304-4165(83)90236-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Polyamine levels and diamine oxidase (EC 1.4.3.6) activity were studied in hypertrophic heart of spontaneously hypertensive rats as well as in the heart of Wistar rats during the development and regression of cardiac hypertrophy induced by isoproterenol administration. In spontaneously hypertensive rats, putrescine content and diamine oxidase activity were higher than those found in normotensive Kyoto-Wistar control rats. During the development of cardiac hypertrophy induced by isoproterenol, there was an increase in polyamine content and diamine oxidase activity. The administration of cycloheximide or actinomycin D prevented the increase in diamine oxidase activity during the first 24 h after isoproterenol administration, demonstrating that the rise in diamine oxidase activity was due to synthesis of new enzyme. Following the cessation of isoproterenol treatment, cardiac hypertrophy regressed and polyamine levels and diamine oxidase activity diminished toward control values. The administration of aminoguanidine to isoproterenol-treated rats caused in the heart an inhibition of diamine oxidase activity that led to an increase in putrescine level beyond the values found in animals given isoproterenol alone. The results suggest that the enhancement of diamine oxidase activity plays a role in the regulation of putrescine level in hypertrophic heart.
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Russell DH. Ornithine decarboxylase may be a multifunctional protein. ADVANCES IN ENZYME REGULATION 1983; 21:201-22. [PMID: 6085823 DOI: 10.1016/0065-2571(83)90015-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Ornithine decarboxylase may undergo posttranslational modifications which alter its function. Both transamidation of glutamine residues in the enzyme catalyzed by TGase and phosphorylation of serine and threonine residues catalyzed by a polyamine-stimulated protein kinase have been demonstrated. Data are presented which suggest that these modifications result in translocation of the modified protein to the nucleolus where it regulates the activity of RNA polymerase I to transcribe rDNA, the only active nucleolar genes. Transamidation of specific proteins with primary amines catalyzed by intracellular TGase may be an important posttranslational modification, capable of altering genetic transcription. The rapid half-life of ODC (10-15 min) may be related to rapid posttranslational modification with loss of enzymatic activity rather than to protein degradation.
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17
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Walker EJ, Burns JH, Dow JW. Amino acid transport and protein synthesis in energetically-stable calcium-tolerant isolated cardiac myocytes. BIOCHIMICA ET BIOPHYSICA ACTA 1982; 721:280-8. [PMID: 7171629 DOI: 10.1016/0167-4889(82)90080-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Myocytes isolated by enzymic dispersion from adult rat ventricular tissue are shown to be energetically stable in the presence of 0.5 mM CaCl2. ATP and ADP content and rates of lactate production are comparable with those of intact myocardial tissue and consistent with these cells being tightly coupled. Addition of 2,4-dinitrophenol precipitates rapid changes in adenine nucleotide concentrations and a 10-fold increase in lactate production. Cardiac myocytes selectively transport neutral amino acids of the A and L classes. Transport of the amino acid analogue alpha-aminoisobutyric acid is an active, temperature-dependent and insulin-sensitive process. The apparent Km for alpha-aminoisobutyric acid transport is similar to that determined for embryonic cardiac cells. Mature myocytes incorporate labelled amino acids into cytoplasmic proteins with molecular weights ranging from 10 000 to 150 000. Newly synthesised protein is metabolically stable. The data establishes calcium-tolerant myocytes as an experimental system offering many advantages over whole hearts for short- and long-term studies of protein synthesis and catabolism.
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18
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Selmeci L, Bardócz S, Egyed Z. Isoproterenol-induced responses in the regional polyamine metabolism of the rat heart. Biochem Biophys Res Commun 1982; 108:292-8. [PMID: 7150288 DOI: 10.1016/0006-291x(82)91865-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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19
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20
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Russell DH. Posttranslational modification of ornithine decarboxylase by its product putrescine. Biochem Biophys Res Commun 1981; 99:1167-72. [PMID: 6114735 DOI: 10.1016/0006-291x(81)90741-5] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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21
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Bartolome J, Huguenard J, Slotkin TA. Role of ornithine decarboxylase in cardiac growth and hypertrophy. Science 1980; 210:793-4. [PMID: 6449079 DOI: 10.1126/science.6449079] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Inhibition of cardiac ornithine decarboxylase (ODC) by alpha-difluoromethylornithine (DFMO) did not prevent normal cardiac growth in mature rats but attenuated isoproterenol-induced hypertrophy. Hypertrophy caused by triiodothyronine was not prevented by DFMO. There appear to be both ODC-dependent and ODC-independent processes contributing to the subcellular mechanisms associated with growth, which must be considered in the potential laboratory and clinical use of DFMO.
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22
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Sedman RM, Tephly TR. Cardiac δ-aminolevulinic acid synthetase activity. Biochem Pharmacol 1980; 29:795-800. [DOI: 10.1016/0006-2952(80)90559-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/1979] [Accepted: 08/13/1979] [Indexed: 10/27/2022]
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23
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Thadani PV, Schanberg SM. Effect of stress and sympathetic activity on rat cardiac and aortic ornithine decarboxylase activity. Life Sci 1979; 25:1009-15. [PMID: 41992 DOI: 10.1016/0024-3205(79)90585-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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24
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Zähringer J. [The regulation of protein synthesis in heart muscle. Biochemical data, stimulative and inhibitory factors and their clinical significance (author's transl)]. KLINISCHE WOCHENSCHRIFT 1979; 57:541-53. [PMID: 156812 DOI: 10.1007/bf01491133] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The regulation of protein synthesis in heart muscle has been investigated by many authors under both normal and pathological conditions. This review summarizes the evidence for the dependence of normal heart protein synthesis from normal serum levels of insulin, amino acids, fatty acids and glucose. A decreased serum concentration of these substances causes an inhibition of heart muscle protein synthesis by 30--60%. Various drugs and other chemical lead to similar impairments of heat muscle protein synthesis. The resulting imbalance between synthesis and degradation of myocardial proteins with their half-times of 5--12 days gradually leads to a decrease in their myocellular concentration with a consequent impairment of myocardial function. Finally, the biochemial sequences are described which represent the important pathogenetic mechanisms in the development of heart muscle hypertrophy and in the adriamycin-induced cardiomyopathy.
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25
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CANELLAKIS E, VICEPS-MADORE D, KYRIAKIDIS D, HELLER J. The Regulation and Function of Ornithine Decarboxylase and of the Polyamines* *In this article, “polyamines” include putrescine, spermidine, and spermine. ACTA ACUST UNITED AC 1979. [DOI: 10.1016/b978-0-12-152815-7.50009-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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26
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Russell DH, Haddox MK. Cyclic AMP-mediated induction of ornithine decarboxylase in normal and neoplastic growth. ADVANCES IN ENZYME REGULATION 1979; 17:61-79. [PMID: 230710 DOI: 10.1016/0065-2571(79)90008-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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27
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Minaga T, Marton LJ, Piper WN, Kun E. Induction of cardiac L-ornithine decarboxylase by nicotinamide and its regulation by putrescine. EUROPEAN JOURNAL OF BIOCHEMISTRY 1978; 91:577-85. [PMID: 153228 DOI: 10.1111/j.1432-1033.1978.tb12711.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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28
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