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Rodríguez-Arribas M, Pedro JMBS, Gómez-Sánchez R, Yakhine-Diop SMS, Martínez-Chacón G, Uribe-Carretero E, De Castro DCJP, Casado-Naranjo I, López de Munaín A, Niso-Santano M, Fuentes JM, González-Polo RA. Pompe Disease and Autophagy: Partners in Crime, or Cause and Consequence? Curr Med Chem 2017; 23:2275-85. [PMID: 27237817 DOI: 10.2174/1567201812666150122131046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 02/10/2016] [Accepted: 05/29/2016] [Indexed: 11/22/2022]
Abstract
Pompe disease or glycogen storage disease type II (OMIM: 232300) is a lysosomal storage disorder resulting from a partial or total lack of acid alphaglucosidase, which may produce muscle weakness, gait abnormalities, or even death by respiratory failure. In the last decade, autophagy has been proposed as a mechanism involved in the severity of symptoms related to this disorder and as a potential therapeutic target to alleviate disease progression. This review summarizes the relationship between autophagy and Pompe disease, including what information has been recently discovered and what remains unclear.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - R A González-Polo
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBE-RNED).
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2
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Rodríguez-Arribas M, Yakhine-Diop SMS, Pedro JMBS, Gómez-Suaga P, Gómez-Sánchez R, Martínez-Chacón G, Fuentes JM, González-Polo RA, Niso-Santano M. Mitochondria-Associated Membranes (MAMs): Overview and Its Role in Parkinson's Disease. Mol Neurobiol 2016; 54:6287-6303. [PMID: 27714635 DOI: 10.1007/s12035-016-0140-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 09/19/2016] [Indexed: 12/21/2022]
Abstract
Mitochondria-associated membranes (MAMs) are structures that regulate physiological functions between endoplasmic reticulum (ER) and mitochondria in order to maintain calcium signaling and mitochondrial biogenesis. Several proteins located in MAMs, including those encoded by PARK genes and some of neurodegeneration-related proteins (huntingtin, presenilin, etc.), ensure this regulation. In this regard, MAM alteration is associated with neurodegenerative diseases such as Parkinson's (PD), Alzheimer's (AD), and Huntington's diseases (HD) and contributes to the appearance of the pathogenesis features, i.e., autophagy dysregulation, mitochondrial dysfunction, oxidative stress, and lately, neuronal death. Moreover,, ER stress and/or damaged mitochondria can be the cause of these disruptions. Therefore, ER-mitochondria contact structure and function are crucial to multiple cellular processes. This review is focused on the molecular interaction between ER and mitochondria indispensable to MAM formation and on MAM alteration-induced etiology of neurodegenerative diseases.
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Affiliation(s)
- M Rodríguez-Arribas
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain.,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain
| | - S M S Yakhine-Diop
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain.,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain
| | - J M Bravo-San Pedro
- Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers, 75006, Paris, France.,INSERM U1138, 75006, Paris, France.,Université Paris Descartes/Paris V, Sorbonne Paris Cité, 75006, Paris, France.,Université Pierre et Marie Curie/Paris VI, 75006, Paris, France.,Gustave Roussy Comprehensive Cancer Institute, 94805, Villejuif, France
| | - P Gómez-Suaga
- Department Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute Kings College London, London, SE5 9RX, UK
| | - R Gómez-Sánchez
- Department of Cell Biology, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, 9713 AV, Groningen, The Netherlands
| | - G Martínez-Chacón
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain.,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain
| | - J M Fuentes
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain.,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain
| | - R A González-Polo
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain. .,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain.
| | - M Niso-Santano
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Universidad de Extremadura, Avda. De la Universidad S/N, C.P, 10003, Cáceres, Cáceres, Spain. .,Facultad de Enfermería y Terapia Ocupacional, Universidad de Extremadura, Avda. de la Universidad s/n, C.P, 10003, Cáceres, Cáceres, Spain.
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Casado-Naranjo I, Romero Sevilla R, Portilla Cuenca JC, Duque de San Juan B, Calle Escobar ML, Fernández Pereira L, Fuentes JM, Ramírez-Moreno JM. Association between subclinical carotid atherosclerosis, hyperhomocysteinaemia and mild cognitive impairment. Acta Neurol Scand 2016; 134:154-9. [PMID: 26503595 DOI: 10.1111/ane.12525] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/29/2015] [Indexed: 01/09/2023]
Abstract
OBJECTIVE Evidence suggests that intima-media thickness (IMT) and plasma homocysteine (Hcy) levels are associated with one another, and both appear to be related to cognitive dysfunction. However, no connection between both factors taken together and mild cognitive impairment (MCI) has been established. This study analysed potential relationships between IMT, Hcy and MCI. METHODS We included 105 patients with MCI and 76 controls with no history of vascular disease. All participants underwent laboratory analyses, a carotid ultrasound, and clinical and neuropsychological assessment. We used the Mantel-Haenszel test (MHT), ANCOVA and multiple linear regression models (MLRM) to examine any associations between IMT, Hcy and cognitive state. RESULTS The MHT revealed a significant association between IMT and risk of MCI (z = 4.285, P < 0.0001). The OR for the upper quartile vs the lower quartile was 5.12 (95% CI: 2.12-12.36). MHT also showed a clear association between Hcy levels and risk of MCI (z = 3.01, P = 0.003). OR for the upper vs the lower quartile was 3.39 (95% CI: 1.41-8.12). Additionally, we found a correlation between IMT and Hcy (r = 0.162, P = 0.032). CONCLUSIONS Our results suggest that there is a connection between IMT, Hcy levels and presence of amnestic MCI in a population with no history of clinically manifest atherosclerosis. Furthermore, there is also a connection between the IMT and Hcy levels themselves.
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Affiliation(s)
- I. Casado-Naranjo
- Department of Neurology; Hospital San Pedro de Alcántara; Cáceres Spain
- CIBERNED; Department of Biochemistry and Molecular Biology and Genetics; Nursing College; Universidad de Extremadura; Cáceres Spain
| | - R. Romero Sevilla
- Department of Neurology; Hospital San Pedro de Alcántara; Cáceres Spain
| | | | | | | | | | - J. M. Fuentes
- CIBERNED; Department of Biochemistry and Molecular Biology and Genetics; Nursing College; Universidad de Extremadura; Cáceres Spain
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Beaurain J, Bernard P, Dufour T, Fuentes JM, Hovorka I, Huppert J, Steib JP, Vital JM, Aubourg L, Vila T. Intermediate clinical and radiological results of cervical TDR (Mobi-C) with up to 2 years of follow-up. Eur Spine J 2009; 18:841-50. [PMID: 19434431 DOI: 10.1007/s00586-009-1017-6] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Revised: 02/26/2009] [Accepted: 04/19/2009] [Indexed: 01/28/2023]
Abstract
The interest in cervical total disc replacement (TDR) as an alternative to the so-far gold standard in the surgical treatment of degenerative disc disease (DDD), e.g anterior cervical discectomy and fusion (ACDF), is growing very rapidly. Many authors have established the fact that ACDF may result in progressive degeneration in adjacent segments. On the contrary, but still theoretically, preservation of motion with TDR at the surgically treated level may potentially reduce the occurrence of adjacent-level degeneration (ALD). The authors report the intermediate results of an undergoing multicentre prospective study of TDR with Mobi-C prosthesis. The aim of the study was to assess the safety and efficacy of the device in the treatment of DDD and secondary to evaluate the radiological status of adjacent levels and the occurrence of ossifications, at 2-year follow-up (FU). 76 patients have performed their 2-year FU visit and have been analyzed clinically and radiologically. Clinical outcomes (NDI, VAS, SF-36) and ROM measurements were analyzed pre-operatively and at the different post-operative time-points. Complications and re-operations were also assessed. Occurrences of heterotopic ossifications (HOs) and of adjacent disc degeneration radiographic changes have been analyzed from 2-year FU X-rays. The mean NDI and VAS scores for arm and neck are reduced significantly at each post-operative time-point compared to pre-operative condition. Motion is preserved over the time at index levels (mean ROM = 9 degrees at 2 years) and 85.5% of the segments are mobile at 2 years. HOs are responsible for the fusion of 6/76 levels at 2 years. However, presence of HO does not alter the clinical outcomes. The occurrence rate of radiological signs of ALD is very low at 2 years (9.1%). There has been no subsidence, no expulsion and no sub-luxation of the implant. Finally, after 2 years, 91% of the patients assume that they would undergo the procedure again. These intermediate results of TDR with Mobi-C are very encouraging and seem to confirm the efficacy and the safety of the device. Regarding the preservation of the status of the adjacent levels, the results of this unconstrained device are encouraging, but longer FU studies are needed to prove it.
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Affiliation(s)
- J Beaurain
- Neuro-surgery Department, University Hospital, Dijon, France
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5
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Fuentes JM, Hanly EJ, Aurora AR, De Maio A, Shih SP, Marohn MR, Talamini MA. Laparoscopic surgery and the parasympathetic nervous system. Surg Endosc 2006; 20:1225-32. [PMID: 16865627 DOI: 10.1007/s00464-005-0280-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Accepted: 09/07/2005] [Indexed: 11/25/2022]
Abstract
BACKGROUND Laparoscopic surgery preserves the immune system and has anti-inflammatory properties. CO2 pneumoperitoneum attenuates lipopolysaccharide (LPS)-induced cytokine production and increases survival. We tested the hypothesis that CO2 pneumoperitoneum mediates its immunomodulatory properties via stimulation of the cholinergic pathway. METHODS In the first experiment, rats (n = 68) received atropine 1 mg/kg or saline injection 10 min prior to LPS injection and were randomization into four 30-min treatment subgroups: LPS only control, anesthesia control, CO2 pneumoperitoneum, and helium pneumoperitoneum. In a second experiment, rats (n = 40) received atropine 2 mg/kg or saline 10 min prior to randomization into the same four subgroups described previously. In a third experiment, rats (n = 96) received atropine 2 mg/kg or saline 10 min prior to randomization into eight 30-min treatment subgroups followed by LPS injection: LPS only control; anesthesia control; and CO2 or helium pneumoperitoneum at 4, 8, and 12 mmHg. In a fourth experiment, rats (n = 58) were subjected to bilateral subdiaphragmatic truncal vagotomy or sham operation. Two weeks postoperatively, animals were randomized into four 30-min treatment subgroups followed by LPS injection: LPS only control, anesthesia control, CO2 pneumoperitoneum, and helium pneumoperitoneum. Blood samples were collected from all animals 1.5 h after LPS injection, and cytokine levels were determined by enzyme-linked immunosorbent assay. RESULTS Serum tumor necrosis factor-alpha (TNF-alpha) levels were consistently suppressed among the saline-CO2 pneumoperitoneum groups compared to saline-LPS only control groups (p < 0.05 for all four experiments). All chemically vagotomized animals had significantly reduced TNF-alpha levels compared to their saline-treated counterparts (p < 0.05 for all), except among the CO2 pneumoperitoneum-treated animals. Increasing insufflation pressure with helium eliminated differences (p < 0.05) in TNF-alpha production between saline- and atropine-treated groups but had no effect among CO2 pneumoperitoneum-treated animals. Finally, vagotomy (whether chemical or surgical) independently decreased LPS-stimulated TNF-alpha production in all four experiments. CONCLUSION CO2 pneumoperitoneum modulates the immune system independent of the vagus nerve and the cholinergic pathway.
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Affiliation(s)
- J M Fuentes
- Department of Surgery, The Johns Hopkins University School of Medicine, 600 North Wolfe Street, Blalock 665, Baltimore, MD, 21287-4665, USA
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6
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Hanly EJ, Fuentes JM, Aurora AR, Bachman SL, De Maio A, Marohn MR, Talamini MA. Carbon dioxide pneumoperitoneum prevents mortality from sepsis. Surg Endosc 2006; 20:1482-7. [PMID: 16865628 DOI: 10.1007/s00464-005-0246-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Accepted: 06/29/2005] [Indexed: 01/27/2023]
Abstract
BACKGROUND Carbon dioxide (CO2) pneumoperitoneum has been shown to attenuate the inflammatory response after laparoscopy. This study tested the hypothesis that abdominal insufflation with CO2 improves survival in an animal model of sepsis and investigated the associated mechanism. METHODS The effect of CO2, helium, and air pneumoperitoneum on mortality was studied by inducing sepsis in 143 rats via intravenous injection of lipopolysaccharide (LPS). To test the protective effect of CO2 in the setting of a laparotomy, an additional 65 animals were subjected to CO2 pneumoperitoneum, helium pneumoperitoneum, or the control condition after laparotomy and intraperitoneal LPS injection. The mechanism of CO2 protection was investigated in another 84 animals. Statistical significance was determined via Kaplan-Meier analysis for survival and analysis of variance (ANOVA) for serum cytokines. RESULTS Among rats with LPS-induced sepsis, CO2 pneumoperitoneum increased survival to 78%, as compared with using helium pneumoperitoneum (52%; p < 0.05), air pneumoperitoneum (55%; p = 0.09), anesthesia control (50%; p < 0.05), and LPS-only control (42%; p < 0.01). Carbon dioxide insufflation also significantly increased survival over the control condition (85% vs 25%; p < 0.05) among laparotomized septic animals, whereas helium insufflation did not (65% survival). Carbon dioxide insufflation increased plasma interleukin-10 (IL-10) levels by 35% compared with helium pneumoperitoneum (p < 0.05), and by 34% compared with anesthesia control (p < 0.05) 90 min after LPS stimulation. Carbon dioxide pneumoperitoneum resulted in a threefold reduction in tumor necrosis factor-alpha (TNF-alpha) compared with helium pneumoperitoneum (p < 0.05), and a sixfold reduction with anesthesia control (p < 0.001). CONCLUSION Abdominal insufflation with CO2, but not helium or air, significantly reduces mortality among animals with LPS-induced sepsis. Furthermore, CO2 pneumoperitoneum rescues animals from abdominal sepsis after a laparotomy. Because IL-10 is known to downregulate TNF-alpha, the increase in IL-10 and the decrease in TNF-alpha found among the CO2-insufflated animals in our study provide evidence for a mechanism whereby CO2 pneumoperitoneum reduces mortality via IL-10-mediated downregulation of TNF-alpha.
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Affiliation(s)
- E J Hanly
- Department of Surgery, The Johns Hopkins University School of Medicine, 600 North Wolfe Street, Blalock 665, Baltimore, MD 21287-4665, USA
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7
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Escribano JM, Juan J, Bofill R, Rodríguez-Mori A, Maeso J, Fuentes JM, Matas M. Haemodynamic Strategy for Treatment of Diastolic Anterograde Giacomini Varicose Veins. Eur J Vasc Endovasc Surg 2005; 30:96-101. [PMID: 15933990 DOI: 10.1016/j.ejvs.2005.03.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To assess the diagnosis and outcome of a haemodynamic strategy for the treatment of primary varicose veins associated with anterograde diastolic flow (ADF) in the Giacomini vein (GV). METHODS ADF in the GV, with the escape point located at the saphenopopliteal junction, was demonstrated in 15 patients (15 limbs) by duplex ultrasound. No other escape points were seen in this group. ADF was defined as the flow present in the relaxing phase after isometric contraction of the lower limb, measured in the standing position. Duplex and clinical follow-up was performed prospectively at 1 week, at 1, 3, 6, and 12 months and once per year thereafter, between 1998 and 2001. Surgery consisted of flush division of the GV from the small saphenous vein (SSV) and division of the incompetent collateral veins from the GV. RESULTS GV diameter showed an average reduction from 6 to 4 mm 33 months after surgery. Fourteen patients (93%) showed no symptoms or varicose veins. GV reconnection and recurrent ADF was demonstrated in two patients (13%). CONCLUSIONS ADF is a rare condition associated with primary varicose veins. ADF occurs when there is a closed venovenous shunt with recirculation in the muscular diastole. This implies that, although a part of the circuit is ascendant, the re-entry point must be located downstream to the escape point. Accurate duplex assessment is required to distinguish this atypical haemodynamic condition from an abnormal systolic circuit bypassing a deep vein obstruction. Interruption of the GV above its junction with the SSV abolished ADF with an acceptable rate of recurrences.
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Affiliation(s)
- J M Escribano
- Department of Angiology and Vascular/Endovascular Surgery, Hospital General Vall d'Hebron, UAB, barcelona, Spain.
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8
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del Ara RM, González-Polo RA, Caro A, del Amo E, Palomo L, Hernández E, Soler G, Fuentes JM. Diagnostic performance of arginase activity in colorectal cancer. Clin Exp Med 2002; 2:53-7. [PMID: 12049190 DOI: 10.1007/s102380200007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Arginase activity was measured in serum and biopsy from healthy individuals and colorectal cancer patients. Arginase activity in tumor samples (87 +/- 7.7 U/g tissue) was significantly higher than in controls (40.7 +/- 3.3 U/g tissue). However, serum arginase activity did not show any significant change in both groups. Finally, the micromethod used to quantify arginase activity in this study is superior to other methods because it has increased sensitivity, requires less sample, and is less time-consuming. Arginase differences are significant, according to the t-test (P<0.05)
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Affiliation(s)
- Rangel M del Ara
- Departamento de Bioquímica y Biología Molecular, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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9
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Hesse M, Modolell M, La Flamme AC, Schito M, Fuentes JM, Cheever AW, Pearce EJ, Wynn TA. Differential regulation of nitric oxide synthase-2 and arginase-1 by type 1/type 2 cytokines in vivo: granulomatous pathology is shaped by the pattern of L-arginine metabolism. J Immunol 2001; 167:6533-44. [PMID: 11714822 DOI: 10.4049/jimmunol.167.11.6533] [Citation(s) in RCA: 521] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Type 2 cytokines regulate fibrotic liver pathology in mice infected with Schistosoma mansoni. Switching the immune response to a type 1-dominant reaction has proven highly effective at reducing the pathologic response. Activation of NOS-2 is critical, because type 1-deviated/NO synthase 2 (NOS-2)-deficient mice completely fail to control their response. Here, we demonstrate the differential regulation of NOS-2 and arginase type 1 (Arg-1) by type 1/type 2 cytokines in vivo and for the first time show a critical role for arginase in the pathogenesis of schistosomiasis. Using cytokine-deficient mice and two granuloma models, we show that induction of Arg-1 is type 2 cytokine dependent. Schistosome eggs induce Arg-1, while Mycobacterium avium-infected mice develop a dominant NOS-2 response. IFN-gamma suppresses Arg-1 activity, because type 1 polarized IL-4/IL-10-deficient, IL-4/IL-13-deficient, and egg/IL-12-sensitized animals fail to up-regulate Arg-1 following egg exposure. Notably, granuloma size decreases in these type-1-deviated/Arg-1-unresponsive mice, suggesting an important regulatory role for Arg-1 in schistosome egg-induced pathology. To test this hypothesis, we administered difluoromethylornithine to block ornithine-aminodecarboxylase, which uses the product of arginine metabolism, L-ornithine, to generate polyamines. Strikingly, granuloma size and hepatic fibrosis increased in the ornithine-aminodecarboxylase-inhibited mice. Furthermore, we show that type 2 cytokine-stimulated macrophages produce proline under strict arginase control. Together, these data reveal an important regulatory role for the arginase biosynthetic pathway in the regulation of inflammation and demonstrate that differential activation of Arg-1/NOS-2 is a critical determinant in the pathogenesis of granuloma formation.
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Affiliation(s)
- M Hesse
- Schistosomiasis Immunology and Pathology Unit and Max Planck Institut für Immunbiologie, Freiburg, Germany
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10
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Weinberg M, Fuentes JM, Ruiz AI, Lozano FW, Angel E, Gaitan H, Goethe B, Parra S, Hellerstein S, Ross-Degnan D, Goldmann DA, Huskins WC. Reducing infections among women undergoing cesarean section in Colombia by means of continuous quality improvement methods. Arch Intern Med 2001; 161:2357-65. [PMID: 11606152 DOI: 10.1001/archinte.161.19.2357] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Improving obstetric care in resource-limited countries is a major international health priority. OBJECTIVE To reduce infection rates after cesarean section by optimizing systems of obstetric care for low-income women in Colombia by means of quality improvement methods. METHODS Multidisciplinary teams in 2 hospitals used simple methods to improve their systems for prescribing and administering perioperative antibiotic prophylaxis. Process indicators were the percentage of women in whom prophylaxis was administered and the percentage of these women in whom it was administered in a timely fashion. The outcome indicator was the surgical site infection rate. RESULTS Before improvement, prophylaxis was administered to 71% of women in hospital A; 24% received prophylaxis in a timely fashion. Corresponding figures in hospital B were 36% and 50%. Systems improvements included implementing protocols to administer prophylaxis to all women and increasing the availability of the antibiotic in the operating room. These improvements were associated with increases in overall and timely administration of prophylaxis (P<.001) in both hospitals by time series analysis, with adjustment for volume and case mix. After improvement, overall and timely administration of prophylaxis was 95% and 96% in hospital A and 89% and 96% in hospital B. In hospital A, the surgical site infection rate decreased immediately after the improvements (P<.001). In hospital B, the infection rate began a downward trend before the improvements that continued after their implementation (P =.04). CONCLUSION Simple quality improvement methods can be used to optimize obstetric services and improve outcomes of care in resource-limited settings.
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Affiliation(s)
- M Weinberg
- Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA
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11
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Abstract
Exposure of cerebellar granule cells to 1-methyl-4-phenylpiridinium (MPP(+)) results in cell death. We have studied the implication of various membrane transporter systems on MPP(+) neurotoxicity, including the dopamine transporter system (DAT) and cationic amino acid transporters (CAT). We have showed a partial protection against MPP(+) toxicity when the dopamine transporter is inhibited by 1-[2-[bis(4-fluorophenyl)methoxy]ethyl]4-(3-phenylpropyl)piperazinedihydrochloride (GBR-12909). However, almost full protection is only achieved by the simultaneous addition of GBR-12909 and cationic amino acids. These results suggest two ways system of MPP(+) entrance into cerebellar granule cells: the DAT with high activity and the CAT with low activity. We also demonstrated that 5,7-dichlorokynurenic acid (MK-801) failed to protect against MPP(+) exposure, evidencing that N-methyl-D-aspartate (NMDA) receptor is not involved in the MPP(+)-induced cell death.
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MESH Headings
- 1-Methyl-4-phenylpyridinium/metabolism
- 1-Methyl-4-phenylpyridinium/toxicity
- Amino Acid Transport Systems, Basic/drug effects
- Amino Acid Transport Systems, Basic/metabolism
- Amino Acids, Basic/metabolism
- Animals
- Animals, Newborn
- Apoptosis/drug effects
- Apoptosis/physiology
- Carrier Proteins/drug effects
- Carrier Proteins/metabolism
- Cells, Cultured/drug effects
- Cells, Cultured/metabolism
- Cerebellar Cortex/drug effects
- Cerebellar Cortex/metabolism
- Dopamine/metabolism
- Dopamine Plasma Membrane Transport Proteins
- Dopamine Uptake Inhibitors/pharmacology
- Dose-Response Relationship, Drug
- Drug Interactions/physiology
- Excitatory Amino Acid Antagonists/pharmacology
- Female
- Herbicides/metabolism
- Herbicides/toxicity
- MPTP Poisoning/metabolism
- MPTP Poisoning/physiopathology
- Male
- Membrane Glycoproteins
- Membrane Transport Proteins/drug effects
- Membrane Transport Proteins/metabolism
- Nerve Tissue Proteins
- Neurons/drug effects
- Neurons/metabolism
- Neurotoxins/metabolism
- Neurotoxins/toxicity
- Piperazines/pharmacology
- Rats
- Rats, Wistar
- Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors
- Receptors, N-Methyl-D-Aspartate/drug effects
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Affiliation(s)
- R A González-Polo
- Depto. Bioquímica y Biología Molecular y Genética, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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12
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Mora A, Sabio G, González-Polo RA, Cuenda A, Alessi DR, Alonso JC, Fuentes JM, Soler G, Centeno F. Lithium inhibits caspase 3 activation and dephosphorylation of PKB and GSK3 induced by K+ deprivation in cerebellar granule cells. J Neurochem 2001; 78:199-206. [PMID: 11432986 DOI: 10.1046/j.1471-4159.2001.00410.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Lithium protects cerebellar granule cells from apoptosis induced by low potassium, and also from other apoptotic stimuli. However, the precise mechanism by which this occurs is not understood. When cerebellar granule cells were switched to low potassium medium, the activation of caspase 3 was detected within 6 h, suggesting a role of caspase 3 in mediating apoptosis under conditions of low potassium. In the same conditions, lithium (5 mM) inhibited the activation of caspase 3 induced by low potassium. As lithium did not inhibit caspase 3 activity in vitro, these results suggest that this ion inhibits an upstream component that is required for caspase 3 activation. Lithium is known to inhibit a kinase termed glycogen sythase kinase 3 (GSK3), which is implicated in the survival pathway of phosphatidylinositol 3-kinase/protein kinase B (PI3K/PKB). Here we demonstrate that low potassium in the absence of lithium induces the dephosphorylation, and therefore the activation, of GSK3. However, when lithium was present, GSK3 remained phosphorylated at the same level as observed under conditions of high potassium. Low potassium induced the dephosphorylation and inactivation of PKB, whereas when lithium was present PKB was not dephosphorylated. Our results allow us to propose a new hypothesis about the action mechanism of lithium, this ion could inhibit a serine-threonine phosphatase induced by potassium deprivation.
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Affiliation(s)
- A Mora
- Departamento de Bioquímica y Biología Molecular, Facultad de Veterinaria, Universidad de Extremadura, Avenue Universidad s/n, 10071 Cáceres, Spain
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13
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Fuentes JM, Lompré AM, Møller JV, Falson P, le Maire M. Clean Western blots of membrane proteins after yeast heterologous expression following a shortened version of the method of Perini et al. Anal Biochem 2000; 285:276-8. [PMID: 11017716 DOI: 10.1006/abio.2000.4784] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- J M Fuentes
- Unité de Recherche Associée 2096 (Centre National de la Recherche Scientifique et Commissariat à l'Energie Atomique), CEA Saclay, Gif-sur-Yvette Cedex, France
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14
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Mora A, del Ara Rangel M, Fuentes JM, Soler G, Centeno F. Implications of the S-shaped domain in the quaternary structure of human arginase. Biochim Biophys Acta 2000; 1476:181-90. [PMID: 10669784 DOI: 10.1016/s0167-4838(99)00256-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Arginase I is a homotrimeric protein with a binuclear manganese cluster. At the C-terminus of each monomer, the polypeptide chain forms an unusual S-shaped oligomerization motif where the majority of intermonomer contacts are located [Z.F. Kanyo, L.R. Scolnick, D.E. Ash, D.W. Christianson, Nature 383 (1996) 554-557]. In order to study the implication of this motif in the quaternary structure of human arginase I, we have constructed a truncated arginase lacking the 14 C-terminal amino acids, leaving Arg-308 as the last residue in the sequence. The resulting protein retains its trimeric structure, as determined by gel filtration (molecular mass 94 kDa). The same result was obtained in the presence of high ionic strength (KCl 0.5 M). Both data indicate that neither the S-shaped motif nor Arg-308 are fundamental in keeping the trimeric quaternary structure. Data obtained from intrinsic anisotropy and fluorescence intensity studies allow us to predict that the distance between the two unique tryptophans in the sequence is 2.9 nm in the native arginase and 4.1 nm for the truncated mutant. These distances allow us to assume a different conformational state in the truncated arginase without any change in its quaternary structure, suggesting that the carboxy-terminal motif is not the most prominent domain implicated in the quaternary structure of human arginase. Collisional quenching studies reinforce this possibility, since using I(-) as quenching molecule we were able to distinguish the two tryptophans in the truncated arginase. Moreover, kinetic studies show that the truncated mutant was fully active. In summary, the main conclusion about the structure of the human arginase I, derived from our study, is that the C-terminal S-shaped motif is not basic to the maintenance of the quaternary structure nor to the activity of the protein.
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Affiliation(s)
- A Mora
- Departamento de Bioquímica y Biología Molecular, Facultad de Veterinaria, Universidad de Extremadura, Av. Universidad s/n, 10071, Cáceres, Spain
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15
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Abstract
Acute treatment with valproate and Li+ was found to protect cultured cerebellar granule cells against apoptosis induced by low K+ (5 mM). Because the protection was unaffected by MK801 (N-methyl-D-aspartate receptor inhibitor), an increase in glutamate release cannot be responsible for the observed neuroprotection. Insulin also protects against low-K+-induced apoptosis of cerebellar granule cells. This protection is totally dependent on LY294002 (a phosphatidylinositol 3-kinase inhibitor). These results suggest a role for phosphatidylinositol 3-kinase in the neuroprotection induced by insulin. Likewise, and in contrast with the results observed with Li+, the protection induced by valproate is also dependent on insulin and LY294002. Moreover, valproate (a branched-chain fatty acid) does not change the plasma membrane microviscosity under physiological conditions. These results suggest that valproate protects against low-K+-induced apoptosis by acting in the phosphatidylinositol 3-kinase/protein kinase B pathway. The protection by Li+ is independent of this transduction pathway.
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Affiliation(s)
- A Mora
- Departamento de Bioquímica y Biologia Molecular, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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16
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Centeno F, Mora A, Fuentes JM, Soler G, Claro E. Partial lithium-associated protection against apoptosis induced by C2-ceramide in cerebellar granule neurons. Neuroreport 1998; 9:4199-203. [PMID: 9926873 DOI: 10.1097/00001756-199812210-00036] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Primary cultures of cerebellar granule neurons, maintained in a serum-containing medium, underwent apoptosis when exposed to C2-ceramide, as assessed by mitochondrial reduction of MTT and intranucleosomal DNA fragmentation. After an 18 h exposure to 50 microM C2-ceramide, cell viability decreased by 25-40%. Addition of lithium together with C2-ceramide resulted in a partial protection of apoptosis, which was maximal at 5 mM lithium (37% protection). When lithium was added 5 h before the apoptotic stimulus the neuroprotective effect of the ion was clearly increased (66% protection). This effect was not due to intracellular inositol depletion or inhibition of NMDA receptors. Our data broaden the nature of apoptotic insults being reversed by lithium, stressing the neuroprotective effects of the ion.
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Affiliation(s)
- F Centeno
- Departamento de Bioquímica y Biología Molecular, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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17
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Brunon J, Fuentes JM, Azan F, Benezech J, Duthel R, Fotso MJ, George B, Lapras C, Lesoin F, Robert G. [Anterior and antero-lateral surgery of the lower cervical spine (25 years after H. Verbiest). 2: Indications, results, complications)]. Neurochirurgie 1996; 42:229-48. [PMID: 9084751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The present course on the anterior and antero-lateral surgical approach of the lower cervical spine was organized for the neurosurgery trainees by the French Speaking Neurosurgical Society, and was held during the winter meeting in December 1995. The aim of this course was to recall the basic technical principles of the microsurgical anterior cervical approach, and to discuss the main indications of this surgical treatment. Many theoretical points were strengthened by the author's personal experience and comments. In Part I, the technical bases of the different anterior or antero-lateral approaches were presented (1996, 42 : 105-122). In the present Part II, the main indications of the anterior surgical approach to the cervical disk or the vertebral body are detailed, and the requirement of a bone graft and/or an osteosynthesis are discussed with their consequences on the final results. Secondly, variants of the surgical technics in use in case of cervical spinal instability are commented. Then various approaches to the cervical spinal tumors and to the vertebral artery are detailed and commented. Lastly, general and specific complications of the anterior cervical approach are listed with their rate of occurrence, and their prevention and management are discussed.
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Affiliation(s)
- J Brunon
- Service de Neurochirurgie, CHU Bellevue, Saint Elienne
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18
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Fuentes JM, Pascual MR, Salido G, Soler G, Madrid JA. Oscillations in rat liver cytosolic enzyme activities of the urea cycle. Arch Int Physiol Biochim Biophys 1994; 102:237-41. [PMID: 7849268 DOI: 10.3109/13813459409003936] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Diurnal rhythms were studied in three rat liver enzymes of the urea cycle: arginase, arginosuccinate synthetase and arginosuccinase. In animals synchronized to a 12:12 h light-dark cycle these enzymes were determined at 8 different time points under three different feeding schedules: 24 h of fasting, ad libitum feeding and restricted feeding. Under the three experimental conditions maxima of enzyme activities occurred during the dark period. In all cases the maximum activity of arginosuccinase preceded the one of arginase and these in turn the one of arginosuccinate synthetase. On the other hand, the hepatic protein level was maximal during the light period and decreased to its lowest level during the dark period. The restriction of food between 08.00 h and 14.00 h induced an important phase shift of hepatic protein rhythm and arginosuccinase activity. Our results suggest that the diurnal rhythms of cytosolic enzymes of the urea cycle are not only dependent on the light-dark cycle, but also on the synchronizing and masking effect of food intake.
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Affiliation(s)
- J M Fuentes
- Department of Biochemistry, Faculty of Veterinary, University of Exiremadura, Cáceres, Spain
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19
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Fuentes JM, Campo ML, Soler G. Kinetics and inhibition by some aminoacids of lactating rat mammary gland arginase. Arch Int Physiol Biochim Biophys 1994; 102:255-8. [PMID: 7849272 DOI: 10.3109/13813459409003940] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Some kinetic and regulatory properties of lactating rat mammary gland arginase were studied. At pH 7.4, i.e. at near-physiological conditions, there was evidence of inhibition by excess of substrate, with a Km value of 9.5 mM, slightly lower than the value of 18 mM observed at pH 9.8 (maximum enzyme activity). A study was also made of the effects of proline, ornithine, lysine and certain branched-chain aminoacids on enzyme activity: lactating rat mammary gland arginase was strongly and competitively inhibited by lysine, ornithine and valine, with Ki values of 1.2 mM, 1.1 mM and 3.6 mM, respectively. Other aminoacids (proline, isoleucine and leucine) also inhibited lactating rat mammary gland arginase, although to a lesser extent.
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Affiliation(s)
- J M Fuentes
- Departamento de Bioquímica, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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20
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Diez A, Fuentes JM, Prada F, Campo ML, Soler G. Immunological identity of the two different molecular mass constitutive subunits of liver arginase. Biol Chem Hoppe Seyler 1994; 375:537-41. [PMID: 7811393 DOI: 10.1515/bchm3.1994.375.8.537] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A detailed understanding of the regulatory mechanisms of arginase in the cell will depend on the clarification of the origin of the two different molecular mass subunits and on the arrangements of them to constitute the native enzyme. Here, we show the immunological recognition of the 39.5 and 37.0 kDa subunits of arginase by antibodies against both subunits. We also find that the subunit stoichiometry (39.5 kDa: 37.0 kDa) present in purified arginase preparations as well as in fresh isolated microsomes and cytoplasm corresponds to 3:1, indicating high prevalence of a constant arrangement of the constitutive subunits of arginase. These findings represent evidence for a limited posttranscriptional or posttranslational modification of only a fraction of the synthesized arginase in liver.
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Affiliation(s)
- A Diez
- Departamento de Bioquímica y Biología Molecular y Genética, Universidad de Extremadura, Facultad de Veterinaria, Cáceres, Spain
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21
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Fuentes JM, Campo ML, Soler G. Kinetics of manganese reconstitution and thiol group exposition in dialyzed rat mammary gland arginase. Int J Biochem 1994; 26:653-9. [PMID: 8005350 DOI: 10.1016/0020-711x(94)90165-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
1. Rat mammary gland arginase is a metallo-enzyme dependent on Mn2+, which can be only partially substituted by Cd2+. 2. Reconstitution of the activity of dialyzed arginase by manganese is a two-phase process; the second phase is independent of the cation concentration, with a half-time recovery (t1/2) of 10.77 min. 3. The apparent Km for Mn2+ is 280 microM and 10.5 microM for enzyme dialyzed for 24 and 72 hr, respectively. 4. Treatment with 5 mM EDTA at pH 6 totally inhibits enzyme activity, which is reconstituted by Mn2+. 5. Results obtained with iodoacetamide treatment suggest the existence of sulphydryl groups accessible only when the enzyme is dialyzed.
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Affiliation(s)
- J M Fuentes
- Departamento de Bioquímica, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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22
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Corraliza IM, Campo ML, Fuentes JM, Campos-Portuguez S, Soler G. Parallel induction of nitric oxide and glucose-6-phosphate dehydrogenase in activated bone marrow derived macrophages. Biochem Biophys Res Commun 1993; 196:342-7. [PMID: 8216310 DOI: 10.1006/bbrc.1993.2254] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The production of nitric oxide (NO.) and the induction of glucose-6-phosphate dehydrogenase by lipopolysaccharides (LPS) from different sources was studied in bone marrow derived macrophages (BMM phi). NO. production was found to be linked to the induction of glucose-6-phosphate dehydrogenase, suggesting the possible involvement of this enzyme in the cytotoxic mechanism resulting from the release of NO. by activated macrophages.
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Affiliation(s)
- I M Corraliza
- Departamento de Bioquímica, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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23
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Abstract
This report concerns 15 adults (nine men and six women) who experienced lumbar and sciatic pain associated with an unusual defect of the edges of the vertebral bodies together with a small bony ridge protruding into the spinal canal. This lesion was well demonstrated by computed tomography and easily differentiated from the posterior longitudinal ligament or herniated disc calcifications, as well as from posterior degenerative ridge osteophytes. This lesion looked like the so-called lumbar posterior marginal node. First described in adolescents, this entity was considered as a traumatic fracture of the posterior ring apophysis. Recently, identical cases were noted in young adults in the absence of previous trauma, which were a particular type of marginal cartilaginous node. In the cases reported here, the computed tomographic scans suggested several mechanisms of formation of the vertebral lesion: a variant of marginal cartilaginous nodes; traumatic avulsion; avulsion related to disc herniation; and fusion of the avulsed bony fragment with the vertebral body.
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Affiliation(s)
- J L Leroux
- Department of Physical Medicine, Lapeyronie Hospital, Montpellier, France
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24
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Bautista JM, Fuentes JM, Diez A, Gutiérrez-Merino C, Soler G. Unfolding and trypsin inactivation studies reveal a conformation drift of glucose-6-phosphate dehydrogenase upon binding of NADP. Biochim Biophys Acta 1992; 1122:99-106. [PMID: 1633201 DOI: 10.1016/0167-4838(92)90133-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Binding of NADP to glucose-6-phosphate dehydrogenase (G6PD) from Dicentrarchus labrax liver has stabilized its native structure against thermal inactivation, guanidine hydrochloride unfolding and inactivation by tryptic digestion. The time-course of G6PD inactivation by guanidine hydrochloride in the presence of NADP has provided experimental evidence in favor of a conformational drift upon NADP binding to the bass enzyme. Based on the inactivation patterns obtained when the enzyme was treated with guanidine hydrochloride and trypsin, it is proposed that the enzyme conformation induced upon NADP binding is in slow equilibrium with the conformation stabilized in the absence of NADP. FPLC studies have shown that micromolar concentrations of NADP induced oligomerization of G6PD. In addition, the different K0.5 values of NADP binding to the enzyme, ranging from 1-2 microM (from trypsin inactivation) to 90 microM (from titration of the intrinsic fluorescence), suggest a step-wise binding of NADP to the oligomer, with negative cooperativity in the saturation process.
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Affiliation(s)
- J M Bautista
- Departamento de Bioquímica y Biología Molecular IV, Universidad Complutense de Madrid, Facultad de Veterinaria, Spain
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25
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Campo ML, Fuentes JM, Soler G. An arginine regulated gamma-guanidobutyrate ureahydrolase from tench liver (Tinca tinca L.). Arch Int Physiol Biochim Biophys 1992; 100:55-60. [PMID: 1380333 DOI: 10.3109/13813459209035259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A gamma-guanidobutyrate ureahydrolase isolated from tench liver has been characterized. Some of its physicochemical properties like pH effect and thermal stability resemble those of arginases, however it shows some peculiarities that makes it different from arginases and other amidino hydrolases. Thus cation requirement is not as strong as in arginases, and the Km value for gamma-guanido-butyric acid (230 +/- 25 mM) is shifted to a lower value (45 +/- 5 mM) by 5 mM arginine. The possible regulatory role of arginine on gamma-guanidobutyrate ureahydrolase activity is discussed.
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Affiliation(s)
- M L Campo
- Dept. de Bioquímica y Biología Molecular y Genética, Facultad de Veterinaria, Universidad de Extremadura, Cáceres, Spain
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26
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Fuentes JM, Campo ML, Soler G. Physico-chemical properties of hepatocyte plasma-membrane-bound arginase. Arch Int Physiol Biochim Biophys 1991; 99:413-7. [PMID: 1725742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Rat liver plasma-membrane-bound arginase was investigated in order to obtain data regarding its physico-chemical properties. Arginase bound to plasma membrane presented a specific activity of 0.74 +/- 0.09 IU/mg for the fully-activated enzyme, the pH of maximum activity being 9.8. Maximum stability was recorded at two pH values, 7 and 10.5 respectively. Mn2+ activated the enzyme, while Cu2+ and Zn2+, and to a lesser extend Co2+, showed a strong inhibitory effect. Ca2+ and Mg2+ had no effect at the concentrations assayed. The influence of temperature was studied in the presence and in the absence of Mn2+. The enzyme was stable up to 65 degrees C in both cases. Membrane- bound arginase showed an activation energy of 11.5 +/- 1.4 Kcal/mol between 20 and 40 degrees C, and 13.3 +/- 2.5 Kcal/mol between 40 and 60 degrees C. The Q10 for the same temperature ranges were 1.78 and 1.9 respectively. The membrane-bound enzyme presented two different Michaelis constants, one with high affinity (2.05 +/- 0.73 mM) and the other with low affinity for arginine (130 +/- 27.2 mM). Solubilized arginase showed very similar values. Among all the structural analogous assayed, only L-canavanine proved to be substrate for arginase, with and L-arginine/L-canavanine hydrolysis ratio of 5.8 +/- 0.28. No reactivity was found between plasma-membrane-bound arginase and anti-rat liver arginase antibodies raised in rabbits.
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Affiliation(s)
- J M Fuentes
- Department of Biochemistry, Molecular Biology and Genetics, University of Extremadura, Faculty of Veterinary Sciences, Cáceres, Spain
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27
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Leroux JL, Baixas P, Fuentes JM, Benezech J, Blotman F. [Posterior pre-marginal hernia in young adults. Clinical and X-ray computed tomography data]. Rev Rhum Mal Osteoartic 1990; 57:633-6. [PMID: 2075400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- J L Leroux
- Service de Réadaptation Fonctionnelle, CHU Hôpital Lapeyronie, Montpellier
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28
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Leroux JL, Boussagol B, Chertok P, Fuentes JM, Blotman F. [Posterior articular pseudocyst]. Rev Rhum Mal Osteoartic 1990; 57:444-5. [PMID: 2197712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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29
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Safdari H, Fuentes JM, Dubois JB, Alirezai M, Castan P, Vlahovitch B. Radiation necrosis of the brain: time of onset and incidence related to total dose and fractionation of radiation. Neuroradiology 1985; 27:44-7. [PMID: 3974866 DOI: 10.1007/bf00342516] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Clinical deterioration during or after brain irradiation may be due to progression of neoplasm or radiation induced necrosis of the neoplasm and/or of normal brain tissues, or a combination of all. Eight patients with histologically documented radiation induced lesions of the brain are included in this study. The radiation therapy included the fractional schedule, group A, who received 280 to 300 rads daily, to a total dose of 4500 to 5000 rads and weekly exposure did not exceed 900 rads. Group B patients were exposed to 850 rads, daily dose on day 1, 3, 21 and 23 to a total dose of 3400 rads. The incidence of radiation induced lesions of brain was 3.4% in patients group A and 8.7% in group B patients (without statistical significance). The median time of onset of these lesions after completion of radiation therapy was significantly shorter in group B patients (8.5 months) as opposed to group A patients (21 months).
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30
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Auch-Roy-Mainguy S, Fuentes JM, Blanchard M, Millet P. [Binasal hemianopsia and hydrocephalus in the adult]. Bull Soc Ophtalmol Fr 1984; 84:701-4. [PMID: 6534603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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31
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Gary-Bobo A, Fuentes JM. Long-term follow-up report on cross-facial nerve grafting in the treatment of facial paralysis. Br J Plast Surg 1983; 36:48-50. [PMID: 6821725 DOI: 10.1016/0007-1226(83)90009-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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32
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Padrós W, Fuentes JM, Giménez M. ["Run-off" bypass]. Angiologia 1981; 33:14-6. [PMID: 7469116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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33
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Gary-Bobo A, Fuentes JM, Guerrier B. Cross-facial nerve anastomosis in the treatment of facial paralysis: a preliminary report on 10 cases. Br J Plast Surg 1980; 33:195-201. [PMID: 7388209 DOI: 10.1016/0007-1226(80)90012-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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34
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Gary-Bobo A, Fuentes JM, Guerrier B. [10 cases of transfacial graft. Technic, indications, first results]. Ann Chir Plast 1980; 25:35-44. [PMID: 7369708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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35
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Padrós W, Fuentes JM, Giménez M. [Intravascular leiomyosarcoma localized in the left iliac vein and inferior vena cava]. Angiologia 1980; 32:33-6. [PMID: 7457998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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36
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Fuentes JM. Cortical arterial pressure in extra-intracranial anastomosis. Acta Neurochir Suppl (Wien) 1979; 28:272-4. [PMID: 290166 DOI: 10.1007/978-3-7091-4088-8_67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Vlahovitch B, Fuentes JM, Choucair Y, Blanchet P, Glatz E, Stoppa J. [Fractures and dislocations of the lumbar vertebrae (author's transl)]. J Chir (Paris) 1978; 115:659-62. [PMID: 744772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The authors report 6 cases of fracture and dislocation of the lower lumbar vertebrae (L3, L4, L5) and note that they were usually lesions following violent trauma usually in hyperflexion. The following were treated 1 dislocation L3-L4, 2 dislocations L4-L5, 2 comminuted fractures of L4, 1 fracture of L5, and included in all cases intersomatic arthrodesis at one (five cases) level or two levels (one case) and one posterior internal fixation with Kempf's material. The simplicity of the follow up and the stability of the fixation, permit us to propose the method for all unstable lesions of the lower lumbar vertebrae.
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Vlahovitch B, Fuentes JM. [Recent fractures of the dorso-lumbar spine. Reduction by the double shroud technique (author's transl)]. Nouv Presse Med 1977; 6:3107-9. [PMID: 335353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The use of posterior osteosynthesis in traumatic pathology of the dorso-lumbar spine, entails some throught about the time maintenance of the quality of the reduction and the solidity of equipment. The observation of the advantages and inconveniences of different methods has led us to the double shroud technique. The simultaneous use of Harrington's and Roy Camille's materials gives an excellent reduction from all points of view. Moreover the double shroud technique improves the stability of posterior osteosynthesis.
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Baldy-Moulinier M, Billiard M, Escuret E, Roquefeuil B, Fuentes JM, Passouant P. [A polygraphic, haemodynamic and metabolic study of 2 cases of the "locked-in" syndrome (author's transl)]. Rev Electroencephalogr Neurophysiol Clin 1977; 7:473-8. [PMID: 611595 DOI: 10.1016/s0370-4475(77)80055-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The sleep-waking pattern, cerebral blood flow (CBF) and cerebral metabolism have been studied in 2 cases of the "locked-in" syndrome, one traumatic, the other vascular in origin. Studies were performed in the third week in the first case and the seventh in the second. A lesion of the ventral pons was suggested clinically and neuroradiologically. The waking EEG was composed of alpha and theta activity. Different stages of slow wave sleep were diminished in quantity (NREM) as was paradoxical sleep (REM). The basal cerebral blood flow (CBF) was increased by 30 p. 100 compared to normals. Cerebral oxygen consumption was normal. The cerebral hyperaemia was evenly distributed and was associated with a failure of autoregulation. The vascular response to CO2 was normal, however. The E.E.G. findings, haemodynamic and metabolic studies confirmed a pontine lesion as the cause of the "locked-in" syndrome in contrast to akinetic mutism where the lesion is in the mid-brain.
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Vlahovitch B, Fuentes JM, Choucair Y, Verger AC. [Inseparable prognostic value of spinothalamic and corticospinal functions in severe spinal cord injuries]. Neurochirurgie 1977; 23:55-72. [PMID: 593485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In severe spinal cord trauma with initial complete paraplegia or tetraplegia, even the smallest recovery of sensibility to pain or motor function has an obvious prognostical value as it results from the study of 112 spinal injuries. For the motor aspect it is well known from experimental work and in man that even a small part of a single pyramidal tract in the spinal cord can take in charge the bilateral motricity of the limbs. It remains exceptional in severe spinal cord injury that recovery of motricity is not followed by a return of pain sens. In the lateral funiculus of the cord the sensitive and pyramidal tracts belongs to a same anastomotic vascular area between the central and peripherical circulatory streams. In physiological conditions this intermediate circulatory stream is poorly functional. But in severe spinal cord trauma with reduction of central blood flow the adjacent spinothalamic and corticospinal tracts survive in couple on the basis of the same anastomotic vascular area: from this results the prognostical unity that belongs to pain sens and motricity.
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Abstract
A method of combined direct embolization of submillimetric cortical arteries, after preoperative arteriography, is described and 3 cases of cerebral angiomas presented with striking symptomatic improvement after embolization. Postoperative angiography in one case showed considerable diminution in the size of the angioma.
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Vlahovitch B, Fuentes JM, Choucair Y, Moreau P, Pascal M. [Complementary procedures to the Sjoqvist operation in cancerous cervico-facial pain]. Neurochirurgie 1976; 22:503-15. [PMID: 1018724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The trigeminal spinal tractotomy of Sjoqvist can be enlarged and give a very good result on cancer pain of face and throat. When pain is also cervical, it is usefull to associate with the Sjoqvist operation two important procedures: 1 degree--Instead of a simple posterior cervical radicotomy it seems best to practise a selective posterior radicellotomy. This technic has the advantage to preserve the sensory proprioceptive capacity of the superior limb, while being perform even until C6 and C7 roots. Also in case of recurrence of cervico brachial pain, it remains easy to apply a posterior spinal stimulation. 2--The spinal nerve has not only a motor function but also a sensory one. The sensory fibers travelling through small anastomosis between "LARUELLE Ganglion" and cervical roots must be separated to obtain a more complete analgesia.
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Vlahovitch B, Fuentes JM, Choucair Y, Orst G, Asencio JG, Maille B, Verger AC. [Prognostic elements at early stapes of severe spinal cord injuries (value of pain sensitivity]. Neurochirurgie 1975; 21:447-68. [PMID: 1228484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The prognosis in serious spinal cord injury remains difficult. The neurologist has a large number of elements at his disposal, but their reliability is uncertain. Clinical information, experimental work and recent data on medullar vascularization makes it possible to isolate diagramatically in the spinal cord a medium layer which contains the pyramidal and spino-thalamic tracts. The neighbourhood of these two fasciculi confers them a similar vulnerability to severe injury. Thus when an injured tetraplegic or paraplegic patient recovers his sensitivity to pain, he finally must recover his motor function and on the contrary, the recovery of motility is impossible without a return of pain sens. Clinical observation is in consequence of major importance as it shows that the recovery of sensitivity to pain, in the case of a patient with a serious spinal cord injury, is an argument for a favourable prognosis, whereas the recovery of an isolated tact perception does not in itself makes it possible to hope for eventual recovery of motor power.
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Vlahovitch B, Fuentes JM. [Results of selective posterior radiculetomy at the lumbar and cervical level]. Neurochirurgie 1975; 21:29-42. [PMID: 52851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
At the light of authors' present experience, radicletomy appears as an excellent antalgic operative procedure in the case of roots with high functional risk (brachial plexus and lumbar plexus). In the absence of any motor deficiency or ataxia, it appears that radicletomy is of help in the cure of severe hypertonies of the extremities (sequelae of cerebral stem contusions). Conversely, in the spastic sequelae of hemi- or paraparesias, lumbar-sacral posterior selective radicotomy is a sure procedure that procures results nearly super-imposable to radicletomy with an appreciable gain in time. At last, for what concerns the motor involvements of the upper extremity ending in spasticity, selective radicletomy recovers its rights and has to be preferred to S.P.R. The indications may be summarized as follows: -- At the level of the lower extremities: in the case of paraparetic sequelae or of sequelae due to spastic paraplegia, a S.P.R. has to be performed; for what concerns antalgic surgery, in the absence of motor deficiency, the best indication is radicletomy. -- At the level of the upper extremities: in the case of dystonic sequeale of the cerebral stem, spastic pain bound with hemiplegia or with carcinoma etc. (herpes zoster..), radicletomy constitutes the ideal surgical procedure.
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Vlahovitch B, Fuentes JM, Humeau C, Choucair Y. [Neurosurgical indications in double brain metastasis]. Neurochirurgie 1974; 20:441-8. [PMID: 4619648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Vlahovitch B, Fuentes JM. [Contribution of methods of osteosynthesis to vertebro-medullary surgery]. Neurochirurgie 1974; 20:61-80. [PMID: 4843929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Vlahovitch B, Fuentes JM, Verger AC. [Insular angioarchitecture in man and primates]. Arch Anat Pathol (Paris) 1973; 21:395-9. [PMID: 4771750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Vlahovitch B, Pérez Domínguez E, Fuentes JM, Guiter J. [Radiological function test of valvular shunt systems in hydrocephalus]. Rev Clin Esp 1973; 129:101-2. [PMID: 4707031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Vlahovitch B, Fuentes JM. [Insular homologies. Comparative anatomy data in mammals]. Neurochirurgie 1972; 18:511-20. [PMID: 4667157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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