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Deng W, Viar MJ, Johnson LR. Polyamine depletion inhibits irradiation-induced apoptosis in intestinal epithelia. Am J Physiol Gastrointest Liver Physiol 2005; 289:G599-606. [PMID: 15860639 DOI: 10.1152/ajpgi.00564.2004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Our group has previously shown that polyamine depletion delays apoptosis in rat intestinal epithelial (IEC-6) cells (Ray RM, Viar MJ, Yuan Q, and Johnson LR, Am J Physiol Cell Physiol 278: C480-C489, 2000). Here, we demonstrate that polyamine depletion inhibits gamma-irradiation-induced apoptosis in vitro and in vivo. Pretreatment of IEC-6 cells with 5 mM alpha-difluoromethylornithine (DFMO) for 4 days significantly reduced radiation-induced caspase-3 activity and DNA fragmentation. This protective effect was prevented by the addition of 10 muM exogenous putrescine. Radiation exposure to mice resulted in a high frequency of apoptosis over cells positioned fourth to seventh in crypt-villus units. Pretreatment of mice with 2% DFMO in drinking water significantly reduced apoptotic cells from approximately 2.75 to 1.61 per crypt-villus unit, accompanied by significant decreases in caspase-3 levels. Further examination showed that DFMO pretreatment inhibited the radiation-induced increase in the proapoptotic protein Bax. Moreover, DFMO pretreatment significantly enhanced the intestinal crypt survival rate by 2.1-fold subsequent to radiation and ameliorated mucosal structural damage. We conclude that polyamine depletion by DFMO inhibits gamma-irradiation-induced apoptosis of intestinal epithelial cells both in vitro and in vivo through inhibition of Bax and caspase-3 activity, which leads to attenuation of radiation-inflicted intestinal injury. These data indicate that DFMO may be therapeutically useful to counteract the gastrointestinal toxicity caused by chemoradiotherapy. This is the first demonstration that polyamines are required for apoptosis in vivo.
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Affiliation(s)
- Wenlin Deng
- Dept. of Physiology, Univ. of Tennessee Health Sciences Center, 894 Union Ave., Memphis, TN 38163, USA
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2
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Farrar RS, Rodnick KJ. Sex-dependent effects of gonadal steroids and cortisol on cardiac contractility in rainbow trout. J Exp Biol 2004; 207:2083-93. [PMID: 15143142 DOI: 10.1242/jeb.00996] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
SUMMARY
The purpose of this study was to determine whether steroid hormones modulate cardiac function in rainbow trout (Oncorhynchus mykissWalbaum). We assessed the effects of exogenously administered steroids on isolated ventricle strips and report that physiological concentrations of androgens, 17β-estradiol and cortisol rapidly (<10 min) enhance inotropism (30–40%) in a sex-specific manner. These effects were specific to the hormones studied, absent if animals were anesthetized chemically and dependent upon steroid concentration and contraction frequency. Based on the use of specific steroid receptor antagonists and key enzyme inhibitors, it appears that testosterone, 11-ketotestosterone and cortisol each act through specific intracellular receptors in males and that the positive inotropism requires the synthesis of polyamines and nitric oxide. Cortisol and 17β-estradiol, but not androgens, had similar effects in females and also involved similar signaling pathways. Androgen and cortisol effects were additive in males but cortisol and 17β-estradiol were not additive in females, suggesting sex differences in the pathways through which these hormones stimulate inotropism. In summary, gonadal steroids and cortisol promote ventricular contractility in a sex-dependent manner through mechanisms that appear multifaceted. Ultimately, steroid-mediated improvements in cardiac performance might involve non-genomic pathways and be physiologically important during migration, spawning or stressful periods.
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Affiliation(s)
- Richard S Farrar
- Department of Biological Sciences, Idaho State University, Pocatello, ID 83209-8007, USA
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3
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Abstract
Nutrition is vital to all bodily processes. During wound healing, it is essential that nutrients are available as they form the building blocks for tissue repair. Nutrition may therefore affect healing due to an overall deficiency of intake, either due to non-availability or due to inability of the patient to absorb sufficiently to meet their requirements. Alternatively, deficiencies of specific nutrients may also inhibit healing and on the converse some additives, not normally present in large quantity in the diet, may have beneficial effects. This review considers the nutritional factors affecting wound healing and some developments that may alter the future of therapy.
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Affiliation(s)
- T M Reynolds
- Queen's Hospital, Division of Clinical Sciences, Wolverhampton, UK
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4
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Affiliation(s)
- Tim M Reynolds
- Clinical Chemistry Department, Queen’s Hospital, Belvedere Road, Burton-on-Trent, Staffordshire DE13 0RB, UK, Fax 44 1283-593064, e-mail
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Olapade-Olaopa EO, MacKay EH, Habib FK. Variability of immunohistochemical reactivity on stored paraffin slides. J Clin Pathol 1998; 51:943. [PMID: 10070342 PMCID: PMC501036 DOI: 10.1136/jcp.51.12.943b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Le Quesne SA, Fairlamb AH. Regulation of a high-affinity diamine transport system in Trypanosoma cruzi epimastigotes. Biochem J 1996; 316 ( Pt 2):481-6. [PMID: 8687391 PMCID: PMC1217375 DOI: 10.1042/bj3160481] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Trypanosoma cruzi epimastigotes take up exogenous [3H]putrescine and [3H]cadaverine by a rapid, high-affinity, transport system that exhibits saturable kinetics (putrescine K(m) 2.0 microM, V(max) 3.3 nmol/min per 10(8) cells; cadaverine K(m) 13.4 microM, V(max) 3.9 nmol/min per 10(8) cells). Putrescine transport is temperature dependent and requires the presence of a membrane potential and thiol groups for activity. Its activity is altered in response to extracellular putrescine levels and as the cells proceed through the growth cycle. This transporter shows high specificity for the diamines putrescine and cadaverine, but low specificity for the polyamines spermidine and spermine. The existence of rapid diamine/polyamine transport systems whose activity can be adjusted in response to the growth conditions is of particular importance, as they seem unable to synthesize their own putrescine [Hunter, Le Quesne and Fairlamb (1994) Eur. J. Biochem. 226, 1019-1027].
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Affiliation(s)
- S A Le Quesne
- Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, U.K
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8
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Katori T, Yasuda H, Fukuda H, Kimura S. Involvement of Ca(2+)-calmodulin in platelet-derived growth factor-, fibroblast growth factor-, and insulin-induced ornithine decarboxylase in NIH-3T3 cells. Metabolism 1994; 43:4-10. [PMID: 8289674 DOI: 10.1016/0026-0495(94)90150-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Ornithine decarboxylase (ODC) was induced by platelet-derived growth factor (PDGF), fibroblast growth factor (FGF), and insulin at doses ranging from 0.125 to 0.5 U/mL, 25 to 500 ng/mL, and 10(-8) to 10(-7) mol/L, respectively, in NIH-3T3 cells. The induction of ODC reached a plateau approximately 4 to 6 hours after addition of each mitogen. PDGF exerted a synergistic action with 10(-7) mol/L insulin until the concentration of PDGF reached 0.5 U/mL and exerted an additive action at concentrations greater than 0.5 U/mL. FGF also accelerated ODC induction by insulin (10(-7) mol/L) synergistically when it was added at doses up to 500 ng/mL. PDGF added to the intact monolayer cells caused a spike-and-plateau increase in cytosolic Ca2+ concentration ([Ca2+]i); the spike was independent of extracellular Ca2+, whereas the plateau formation was dependent on extracellular Ca2+. On the other hand, FGF caused a plateau-like increase in [Ca2+]i, exclusively dependent on extracellular Ca2+. Insulin did not affect [Ca2+]i in NIH-3T3 cells. Trifluoperazine (15 to 30 mumol/L) inhibited the induction of ODC by PDGF and FGF, but did not inhibit the effect of insulin to induce ODC. N-(6-aminohexyl)-5-chloro-1-Naphthalenesulfonamide ([W-7] 30 to 40 mumol/L) showed a more profound suppressive effect on ODC induced by PDGF and FGF than N-(6-aminohexyl)-naphthalenesulfonamide (W-5) did. There was no difference between the effects of W-7 and W-5 on ODC induction by insulin.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- T Katori
- First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan
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9
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Stefanelli C, Ferrari F, Rossoni C, Flamigni F, Caldarera CM. Zinc can influence ornithine decarboxylase activity in rat thymus cells. Amino Acids 1993; 4:53-61. [PMID: 24190557 DOI: 10.1007/bf00805801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/1991] [Accepted: 05/12/1992] [Indexed: 10/26/2022]
Abstract
The thymus of young rats contained a high basal activity of ornithine decarboxylase (ODC). Treatment with zinc sulphate caused a slight increase of thymic ODC activity within 6 hours and a more marked enhancement (three-fold) in the spleen 24 h after treatment. In spite of the high activity of thymic ODCin vivo, ODC was not detectable in primary cultures of rat thymocytes, but was early and largely induced after treatment with Concanavalin A (Con A). The presence of 0.1 mM zinc in the medium increased the response of ODC to Con A. This effect of zinc in mitogen activated thymocytes may be due to the stabilization of ODC, which was found to decay with a half life of 65 min after the block of protein synthesis with cycloheximide. On the contrary in absence of zinc the half life of the enzyme was 40 min, as in the rat thymus in vivo.Zinc alone, at 0.1 mM concentration, did not affect ODC activity in resting thymocytes during the early times, but the metal was able to cause an increase of the enzyme activity after 4-6 days of culture. Other heavy metals such as mercury, cadmium and copper provoked a late increase of ODC activity, but their action was evident only at dosages which were toxic for the cells.
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Affiliation(s)
- C Stefanelli
- Department of Biochemistry, University of Bologna, Via Irnerio 48, I-40126, Bologna, Italy
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10
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Reynolds TM, Marshall PD, Brain AM. Hip fracture patients may be vitamin B6 deficient. Controlled study of serum pyridoxal-5'-phosphate. ACTA ORTHOPAEDICA SCANDINAVICA 1992; 63:635-8. [PMID: 1471512 DOI: 10.1080/17453679209169725] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Deficiency of vitamin B6 in rats may result in defective bone formation, possibly due to decreased activity of the enzyme ornithine decarboxylase which requires pyridoxal-5'-phosphate (PLP) as a co-factor and is responsible for production of intracellular putrescine, a metabolic regulator. We studied 3 groups of patients (62 fit ambulant out-patients, 21 elective arthroplasty patients, and 20 hip fracture patients) and assayed their PLP status by high performance liquid chromatography. The reference range derived from the out-patients was 13-106 nmol/L. 3 of the arthroplasty group and 10 of the fracture group had serum PLP concentrations less than 13 nmol/L (P < 0.01). We conclude that PLP may be an etiologic factor in hip fracture by virtue of its role in the activity of a key regulatory protein.
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Affiliation(s)
- T M Reynolds
- Department of Medical Biochemistry, Cardiff Royal Infirmary, UK
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11
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Warholm M. Studies of the induction of ornithine decarboxylase activity in primary cultures of adult rat hepatocytes by the phorbol ester 12-O-tetradecanoyl-13-acetate and other substances. Toxicol In Vitro 1992; 6:589-96. [DOI: 10.1016/0887-2333(92)90072-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/1992] [Revised: 05/01/1992] [Indexed: 11/26/2022]
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12
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Scalabrino G, Lorenzini EC, Ferioli ME. Polyamines and mammalian hormones. Part I: Biosynthesis, interconversion and hormone effects. Mol Cell Endocrinol 1991; 77:1-35. [PMID: 1815994 DOI: 10.1016/0303-7207(91)90056-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- G Scalabrino
- Institute of General Pathology, University of Milan, Italy
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13
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Alison MR, Sarraf CE, Emons VE, Hill SA, Maghsoudloo M, Murphy GM. Effect of alpha-difluoromethylornithine on the polyamine levels and proliferation in two transplantable tumours. VIRCHOWS ARCHIV. A, PATHOLOGICAL ANATOMY AND HISTOPATHOLOGY 1991; 419:223-30. [PMID: 1926763 DOI: 10.1007/bf01626352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The effect of inhibition of polyamine biosynthesis by alpha-difluoromethylornithine (DFMO) on the growth of two murine transplantable tumours was studied. Female CBA mice were implanted with either the sarcoma F (SaF) or an anaplastic mammary carcinoma (CaNT), and 3% DFMO in the drinking water was provided once the tumours were established. Over a 10-day period control SaF tumours increased exponentially from 20 mm3 to over 800 mm3, whereas DFMO-treated SaF reached only 300 mm3. CaNT grew more slowly, requiring 22 days to achieve a similar volume increase, and DFMO was as effective in retarding growth as it had been in SaF. DFMO depleted tumour tissues of putrescine and spermidine, but did not reduce spermine levels. Metaphase arrest experiments with vincristine demonstrated that DFMO could substantially reduce the rates of tumour cell production, but there was no indication the DFMO accelerated the rate of cell loss from the tumours. Despite reduced rates of cell production, labelling studies with bromodeoxyuridine failed to detect differences between control and treated tumours: an increase in transit time through the S-phase was suspected. The number of nuclear organizer regions, detected by the argyrophilia of their associated proteins, was less in DFMO-treated tumours, and within a tumour the degree of silver deposition unequivocally reflected the proliferative heterogeneity. Ultrastructural studies revealed no differences between DFMO-treated and untreated tumours.
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Affiliation(s)
- M R Alison
- Department of Histopathology, Royal Postgraduate Medical School, London, UK
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14
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Kopitz J, Adam G, Bohley P. Very fast purification of ornithine decarboxylase with high yield from mouse kidney and generation of a monoclonal antibody. BIOLOGICAL CHEMISTRY HOPPE-SEYLER 1990; 371:363-8. [PMID: 2340113 DOI: 10.1515/bchm3.1990.371.1.363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Based on methods for ornithine-decarboxylase purification published previously we developed an improved procedure for purification of the enzyme from the kidneys of testosterone-treated NMRI mice. Advantages of the new procedure are, that inactivation of the enzyme during purification is largely reduced by fast methods for purification and by the use of proteinase inhibitors. That way we got pure ornithine decarboxylase within 60 h with a yield of about 70%. A part of the highly purified ornithine decarboxylase was used for the generation of monoclonal antibodies.
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Affiliation(s)
- J Kopitz
- Physiologisch-Chemisches Institut, Universität Tübingen
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15
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Polyamines in human lymphocytes. Amino Acids 1990. [DOI: 10.1007/978-94-011-2262-7_95] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Yodfat Y, Weiser M, Kreisel M, Bachrach U. Diamine and polyamine levels in the urine of healthy adults. Clin Chim Acta 1988; 176:107-13. [PMID: 3168289 DOI: 10.1016/0009-8981(88)90180-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Y Yodfat
- Department of Family Medicine, Hebrew University-Hadassah Medical School, Jerusalem, Israel
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17
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Malo C. Kinetic arguments for the existence of a single form of intestinal ornithine decarboxylase during the postnatal development of normal and sparse-fur mutant mice and after EGF treatment. EXPERIENTIA 1988; 44:251-2. [PMID: 3258250 DOI: 10.1007/bf01941726] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The Km for ornithine is remarkably constant during the course of postnatal development in both normal and spf mutant mice even if a large but transient increase in ornithine decarboxylase (ODC) activity is noted. Four hours after EGF injection (4 micrograms/g b.wt) to 17-day-old normal and spf mice, a marked stimulation of ODC activity is observed but Km remains unaffected. These data argue against the existence of multiple forms of ODC in the intestinal mucosa of mice.
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Affiliation(s)
- C Malo
- Department of Physiology, Faculty of Medicine, University of Montreal, Québec, Canada
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18
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Peñafiel R, Solano F, Cremades A. The effect of hyperthermia on ornithine decarboxylase activity in different rat tissues. Biochem Pharmacol 1988; 37:497-502. [PMID: 3337747 DOI: 10.1016/0006-2952(88)90220-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Hyperthermia produced a decrease of ornithine decarboxylase activity in different tissues of adult rats. The fall in ornithine decarboxylase was dependent on time of exposure and temperature. The decay of ornithine decarboxylase activity in liver, brain, kidney, heart, spleen and testes was rather similar. The t1/2 for liver ornithine decarboxylase determined by the hyperthermic treatment (40 degrees ambient temperature) was 20 min. Ornithine decarboxylase activity was recovered in all tissues exposed to the hyperthermic shock after a period of 4 hours, although the degree of recovery was dependent on the type of tissue. The effect that hyperthermia produces on ornithine decarboxylase activity in rats could be related to an inhibition in the synthesis of active enzyme rather than to a specific degradation or inactivation of ornithine decarboxylase molecule.
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Affiliation(s)
- R Peñafiel
- Departmentos de Bioquímica y Farmacología, Facultad de Medicina, Universidad de Murcia, Spain
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Solano F, Peñafiel R, Solano ME, Lozano JA. Kinetic study of the inhibition of rat liver ornithine decarboxylase by diamines; considerations on the mechanism of interaction between enzyme and inhibitor. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1988; 20:463-70. [PMID: 3366303 DOI: 10.1016/0020-711x(88)90216-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
1. Partially purified rat liver ornithine decarboxylase is inhibited by several diamines including putrescine, 1,3-diaminopropane, cadaverine and p-phenylenediamine. 2. The inhibition is dependent on pH, being strong at pH above 8 and negligible below pH 6.5. 3. The kinetic study of the inhibition showed that while the aromatic diamine behaved as a simple competitive inhibitor, the aliphatic diamines presented a more complex pattern of inhibition in which two molecules of inhibitor might bind to the enzyme active site. 4. The Ki values for the different inhibitors were calculated and the degree of affinity for the enzyme was p-phenylenediamine greater than putrescine greater than cadaverine greater than 1,3-diaminopropane. 5. A molecular mechanism explaining how one or two molecules of inhibitor can bind to the enzyme is proposed.
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Affiliation(s)
- F Solano
- Departmento de Bioquímica, Facultad de Medicina, Universidad de Murcia, Spain
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20
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Sertich GJ, Persson L, Pegg AE. Regulation of ovarian ornithine decarboxylase by human chorionic gonadotrophin. THE AMERICAN JOURNAL OF PHYSIOLOGY 1987; 253:C687-92. [PMID: 3688216 DOI: 10.1152/ajpcell.1987.253.5.c687] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Treatment of 29-day-old female Sprague-Dawley rats with human chorionic gonadotrophin (hCG) produced a large and rapid increase in the activity of ornithine decarboxylase. Measurements that use a specific radioimmunoassay showed that the increased activity could be accounted for by a parallel change in the amount of ornithine decarboxylase protein. The increased protein content was caused by an increased rate of synthesis, since the half-life of ornithine decarboxylase was not changed by the hormone treatment. The content of mRNA for ornithine decarboxylase was determined by hybridization with a cDNA probe, and it was found that the increased amount of protein was correlated with a change in the amount of mRNA. These results indicate that treatment with hCG induces ornithine decarboxylase in the rat ovary by increasing the production or the stability of the mRNA for this enzyme. The increased amount of ornithine decarboxylase led to an increase in putrescine in the ovary but did not increase the content of the polyamines spermidine and spermine. These findings show that, despite its rapid and large scale induction, ornithine decarboxylase is not the rate-limiting step that determines the content of these polyamines in this tissue. They also suggest that putrescine itself may play an important role in the ovary.
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Affiliation(s)
- G J Sertich
- Department of Physiology, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey 17033
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21
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Assaraf YG, Golenser J, Spira DT, Messer G, Bachrach U. Cytostatic effect of DL-alpha-difluoromethylornithine against Plasmodium falciparum and its reversal by diamines and spermidine. Parasitol Res 1987; 73:313-8. [PMID: 3112767 DOI: 10.1007/bf00531084] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
DL-alpha-difluoromethylornithine (DFMO) inhibited ornithine decarboxylase (ODC) activity and arrested the growth of Plasmodium falciparum at the early trophozoite stage. The inhibition of ODC activity did not result in the formation of an alternative diamine such as cadaverine. When putrescine or spermidine were added to the parasites grown in culture, the arrest was reversed, and normal schizogony was completed even in the presence of DFMO. Some reversal of the inhibition was achieved with cadaverine at high concentrations, while 1,3-diaminopropane and spermine failed to restore the development. Resumption of growth could be detected when putrescine was added even after 67 h of DFMO treatment. Electron microscopy did not reveal any changes in the morphology of parasites treated for 47 h, while 73 h of treatment with DFMO induced massive accumulation of pigment. Death was observed a few hours later. These results suggest that DFMO acts as a cytostatic rather than as a cytocidal agent. The four carbon diamine restored cell growth while the shorter or the longer homologous compounds showed little activity.
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22
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Richards JF, Bishop PB, Peng T, Beer CT, Gout PW. An inhibitor of ornithine decarboxylase in lactogen-deprived Nb2 node rat lymphoma cells. BIOCHIMICA ET BIOPHYSICA ACTA 1986; 883:542-51. [PMID: 3756220 DOI: 10.1016/0304-4165(86)90295-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A previous study has shown that the activity of ornithine decarboxylase in cultured Nb2 node rat lymphoma cells falls to undetectable levels when cells become quiescent following incubation in lactogen (prolactin)-deficient medium. In the present study, it was found that addition of extracts of the lactogen-deprived, quiescent cells to extracts of log-phase cells markedly reduced the ornithine decarboxylase activity of the latter, the inhibitory activity being proportional to the amount of quiescent cell extract added. Evidence is presented that the ornithine decarboxylase-inhibitory activity in the quiescent cell extracts is due to an antizyme-like, polypeptide factor with an Mr of approx. 28,000. The activity of the inhibitor appears to be directed rather specifically against ornithine decarboxylase, since the activities of S-adenosylmethionine decarboxylase, thymidine kinase and uridine kinase were not affected. The Nb2 cell ornithine decarboxylase inhibitor may have an important role in modulating the cellular levels of ornithine decarboxylase as they change in response to the withdrawal and restoration of extracellular mitogenic lactogens.
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23
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Gilad GM, Dornay M, Gilad VH. Increased number of sympathetic neurons with unchanged target organ innervation after postnatal polyamine treatment. Brain Res 1986; 393:163-8. [PMID: 2874872 DOI: 10.1016/0165-3806(86)90019-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Treatment of newborn rats with polyamines from day 2 to day 9 after birth prevented the normal reduction in the number of sympathetic neurons in the superior cervical ganglion. About 40% more neurons prevailed in the ganglion after the polyamine treatment. This increase was paralleled by a comparable developmental increase in tyrosine hydroxylase activity and a small (17%) increase in choline acetyltransferase activity in the ganglion. However, in the iris, a target organ innervated by the sympathetic neurons, tyrosine hydroxylase activity and [3H]norepinephrine uptake remained unchanged. The results indicate that the polyamine-induced increase in the number of parent neurons is not accompanied by a change in the number of functional nerve terminals in the target organ.
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24
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Flamigni F, Stefanelli C, Guarnieri C, Caldarera CM. Modulation of ornithine decarboxylase activity and ornithine decarboxylase-antizyme complex in rat heart by hormone and putrescine treatment. BIOCHIMICA ET BIOPHYSICA ACTA 1986; 882:377-83. [PMID: 3730419 DOI: 10.1016/0304-4165(86)90261-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Ornithine decarboxylase was present in a cryptic, complexed form in an amount approximately equivalent to that of free ornithine decarboxylase activity in adult rat heart. Addition of isoproterenol (10 mg/kg) caused a notable rise in ornithine decarboxylase activity and a simultaneous decrease in the amount of the complexed enzyme. During the period of ornithine decarboxylase decay, when cardiac putrescine content had reached high values, the level of the complex increased above that of the control. Administration of putrescine (1.5 mmol/kg, twice) or dexamethasone (4 mg/kg) produced a decrease of heart ornithine decarboxylase activity, while it did not remarkably affect the level of complexed ornithine decarboxylase, therefore raising significantly the ratio of bound to total ornithine decarboxylase. Putrescine also elicited the appearance of free antizyme, concomitantly with the disappearance of free ornithine decarboxylase activity after 3-4 h of treatment. These results indicate that a significant amount of ornithine decarboxylase occurs in an inactive form in the heart under physiological conditions and that its absolute and relative levels may vary following stimuli which affect heart ornithine decarboxylase activity.
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25
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Dodds RA, Dunham J, Bitensky L, Chayen J. Putrescine may be a natural stimulator of glucose-6-phosphate dehydrogenase. FEBS Lett 1986; 201:105-8. [PMID: 3709800 DOI: 10.1016/0014-5793(86)80579-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The possible relationship between pyridoxal phosphate-dependent ornithine decarboxylase (ODC) activity and glucose-6-phosphate dehydrogenase (G6PD) activity has been studied in the osteoblasts of the growth-plate of metatarsals of rats fed a pyridoxine-deficient diet, which caused depressed G6PD levels. The G6PD activity was fully restored when it was assayed in the presence of putrescine. It is suggested that this relationship may account for the correlation generally found between growth and ODC activity.
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26
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Cheng SV, Pollard JW. c-rasH and ornithine decarboxylase are induced by oestradiol-17 beta in the mouse uterine luminal epithelium independently of the proliferative status of the cell. FEBS Lett 1986; 196:309-14. [PMID: 3949003 DOI: 10.1016/0014-5793(86)80269-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Oestradiol-17 beta (E2) treatment of the ovariectomized mouse results in a synchronised wave of cell proliferation in the uterine luminal epithelium. At the peak of DNA synthesis the mRNA level of the c-rasH proto-oncogene and ornithine decarboxylase were significantly increased. Progesterone treatment completely inhibits the E2 induced wave of DNA synthesis but does not greatly influence the level of these 2 mRNAs. Thus in the uterine luminal epithelium E2 regulates the level of ornithine decarboxylase and c-rasH independently of cell proliferation.
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27
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Abstract
Vitamin K1 is the intermediate carrier of reducing equivalents in mineralization. In fracture-healing in the rat metatarsal the primary source of these reducing equivalents appears to be NADPH, generated from glucose 6-phosphate dehydrogenase (G6PD) activity. Because recent evidence indicated that stimulation of G6PD activity can be induced by putrescine, derived from pyridoxal phosphate-dependent ornithine decarboxylase activity, the effect of pyridoxine (vitamin B6) deficiency has been studied in this system. Vitamin B6-deficiency caused marked diminution in the G6PD activity in the periosteal region of bone-formation and in the developing callus, with significant delay in the maturation of the callus and union. It also caused changes in the bone suggestive of imbalance in the coupling between osteoblasts and osteoclasts. These results suggest that the vitamin B6-status may be important in fracture-healing.
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Stefanelli C, Flamigni F, Carati D, Rossoni C. Effect of adrenergic stimulation on ornithine decarboxylase activity in the rat spleen. GENERAL PHARMACOLOGY 1986; 17:355-7. [PMID: 3721190 DOI: 10.1016/0306-3623(86)90054-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effect of a single administration of catecholamines on ornithine decarboxylase activity and polyamine biosynthesis in the rat spleen was investigated. Isoproterenol elicited a dose-dependent increase in spleen ODC activity which reached a maximum 4 hr after the administration of the drug. Putrescine content was also found to increase within a few hours, whereas S-adenosylmethionine decarboxylase activity and spermidine and spermine levels did not change significantly. Adrenaline and noradrenaline proved to be even more effective in increasing splenic ODC activity than isoproterenol. alpha- and beta-adrenergic antagonists prevented the ODC increase by catecholamines to a different extent.
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29
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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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30
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Kaye AM, Reiss NA, Weisman Y, Binderman I, Sömjen D. Hormonal regulation of creatine kinase BB. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1986; 194:83-101. [PMID: 3019105 DOI: 10.1007/978-1-4684-5107-8_7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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31
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Gilad GM, Dornay M, Gilad VH. Polyamine treatment in early development leads to increased numbers of rat sympathetic neurons. Brain Res 1985; 348:363-6. [PMID: 4075095 DOI: 10.1016/0006-8993(85)90458-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Sympathetic and sensory neurons were counted in 35-day-old rats which were treated with polyamines from day 2 to day 9 after birth. The treatment led to an increase, averaging about 34%, in the number of sympathetic neurons in the superior cervical ganglion. The number of sensory neurons in the nodose ganglion was not changed. In sympathetic ganglia the activity of the neurotransmitter synthesizing enzyme tyrosine hydroxylase was also increased. The results demonstrate that increased polyamine supply during a limited developmental period can lead to an increased number of sympathetic neurons, possibly through enhanced neuron survival.
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32
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Solano F, Peñafiel R, Solano ME, Lozano JA. Equilibrium between active and inactive forms of rat liver ornithine decarboxylase mediated by L-ornithine and salts. FEBS Lett 1985; 190:324-8. [PMID: 3930296 DOI: 10.1016/0014-5793(85)81311-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The mechanisms controlling the activity of ornithine decarboxylase (ODC) are complex and only partly understood. This study shows that ODC can exist as two different aggregation states, that differ in catalytic activity, the dimeric form being active and the monomeric form inactive. While L-ornithine shifts the association-dissociation equilibrium to the dimeric form, salts produce an opposite effect leading to subunit dissociation. alpha-DFMO, an enzyme-activated irreversible inhibitor of ODC, does not react with the monomeric form and therefore the influence of substrate and salts on the aggregation equilibrium must be taken into account in titration experiments with alpha-DFMO of the total amount of ODC in tissue preparations.
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Keiko T, Kozo I, Yasuo N. Evidence for the existence of isozymes of choline kinase and their selective induction in 3-methylcholanthrene- or carbon tetrachloride-treated rat liver. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0005-2760(85)90119-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Bishop PB, Young J, Peng T, Richards JF. An inhibitor of ornithine decarboxylase in the thymus and spleen of dexamethasone-treated rats. Biochem J 1985; 226:105-12. [PMID: 3977859 PMCID: PMC1144682 DOI: 10.1042/bj2260105] [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: 01/08/2023]
Abstract
A marked decrease in activity of ornithine decarboxylase in thymus and spleen occurs soon after treatment of rats with a glucocorticoid. In the present study, evidence was obtained that extracts of these tissues prepared 5 h after administration of dexamethasone, when the enzyme activity is very low, contain an inhibitor of ornithine decarboxylase. The inhibitor is also present at 12 h after treatment and, in lesser amount, at 2.5 h, but was not evident at 24 h. The inhibitory activity was destroyed by treatment with heat or with trypsin, and was not lost on dialysis of the extract. Preliminary experiments indicate that the Mr of the inhibitor is greater than 50 000, which differentiates it from antizyme, an inhibitor of ornithine decarboxylase found in several other cell types. The inhibitor seems to act by a non-catalytic and non-competitive mechanism. The inhibition is dependent on the amount of inhibitor and does not change with time. Since inhibition is not changed by dialysis of the inhibitory extract, its activity apparently does not require small-Mr substances. This differentiates it from inhibitors which inactivate ornithine decarboxylase by covalent modification, such as the polyamine-dependent protein kinase or transglutaminase. The formation of this inhibitor is an early event in lymphoid tissues in response to dexamethasone and may be important in causing the inhibition of cell division which precedes the destruction of lymphocytes.
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Abstract
Ornithine decarboxylase is a key enzyme in polyamine synthesis and growth of mammalian cells. In this chapter I review recent reports on the purification and properties of the pure enzyme, and on the localization, synthesis and regulation of the enzyme in the cell. The use of monospecific antibodies, radiolabeled irreversible inhibitors and cDNA clones for studying enzyme localization, turnover and regulation, is briefly described. This first part is meant to serve as a basis for the analysis of ornithine decarboxylase as a target of chemotherapy. A selection of the most potent inhibitors of ornithine decarboxylase is presented and the effects of some of these in cell culture, in animals and in the clinical setting are reviewed.
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Gilad GM, Gilad VH. Inhibition of ornithine decarboxylase and glutamic acid decarboxylase activities by phosphorylethanolamine and phosphorylcholine. Biochem Biophys Res Commun 1984; 122:277-82. [PMID: 6743332 DOI: 10.1016/0006-291x(84)90471-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Ornithine decarboxylase, which catalyzes the first step in polyamine biosynthesis, is rapidly and transiently increased in various tissues during growth and after various hormonal or noxious stimuli, prior to an elevation in choline kinase activity. Polyamines themselves have been demonstrated to activate choline kinase. The present study sought to determine the effect of phosphorylcholine, the product of the reaction catalyzed by choline kinase, on ornithine decarboxylase activity. The data demonstrate that ornithine decarboxylase activity. The data demonstrate that ornithine decarboxylase activity is inhibited by phosphorylcholine and more potently by the related compound phosphorylethanolamine. The inhibition by both compounds led to decreased affinity of partially purified ornithine decarboxylase for ornithine. The inhibition is not time dependent and reversible. Both compounds also inhibit glutamic acid decarboxylase activity. The results suggest that high intracellular levels of phosphorylethanolamine and phosphorylcholine can serve as natural inhibitors of decarboxylases.
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37
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Kaye AM. Ornithine decarboxylase. Purification and properties of ornithine decarboxylase. Cell Biochem Funct 1984; 2:2-6. [PMID: 6380791 DOI: 10.1002/cbf.290020102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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