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Kahana M, Weizman A, Gabay M, Loboda Y, Segal-Gavish H, Gavish A, Barhum Y, Offen D, Finberg J, Allon N, Gavish M. Liposome-based targeting of dopamine to the brain: a novel approach for the treatment of Parkinson's disease. Mol Psychiatry 2021; 26:2626-2632. [PMID: 32372010 DOI: 10.1038/s41380-020-0742-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 03/08/2020] [Accepted: 04/20/2020] [Indexed: 02/06/2023]
Abstract
Delivery of drugs into the brain is poor due to the blood brain barrier (BBB). This study describes the development of a novel liposome-based brain-targeting drug delivery system. The liposomes incorporate a diacylglycerol moiety coupled through a linker to a peptide of 5 amino acids selected from amyloid precursor protein (APP), which is recognized by specific transporter(s)/receptor(s) in the BBB. This liposomal system enables the delivery of drugs across the BBB into the brain. The brain-directed liposomal system was used in a mouse model of Parkinson's disease (PD). Intra-peritoneal (IP) administration of liposomes loaded with dopamine (DA) demonstrated a good correlation between liposomal DA dose and the behavioral effects in hemiparkinsonian amphetamine-treated mice, with an optimal DA dose of 60 µg/kg. This is significantly lower dose than commonly used doses of the DA precursor levodopa (in the mg/kg range). IP injection of the APP-targeted liposomes loaded with a DA dose of 800 µg/kg, resulted in a significant increase in striatal DA within 5 min (6.9-fold, p < 0.05), in amphetamine-treated mice. The increase in striatal DA content persisted for at least 3 h after administration, which indicates a slow DA release from the delivery system. No elevation in DA content was detected in the heart or the liver. Similar increases in striatal DA were observed also in rats and mini-pigs. The liposomal delivery system enables penetration of compounds through the BBB and may be a candidate for the treatment of PD and other brain diseases.
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Affiliation(s)
- Meygal Kahana
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel
| | - Abraham Weizman
- Research Unit at Geha Mental Health Center and the Laboratory of Biological Psychiatry, Felsenstein Medical Research Center, 4910002, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel-Aviv University, 6997801, Tel Aviv, Israel
| | - Martin Gabay
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel
| | - Yelena Loboda
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel
| | - Hadar Segal-Gavish
- Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel.,Laboratory of Neuroscience, Felsenstein Medical Research Center, 4910002, Petah Tikva, Israel.,The Child Psychiatry Division, Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, 5262000, Israel
| | - Avishai Gavish
- Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel.,Goldschleger Eye Institute, Sheba Medical Center, Tel Hashomer, 5262000, Israel
| | - Yael Barhum
- Laboratory of Neuroscience, Felsenstein Medical Research Center, 4910002, Petah Tikva, Israel
| | - Dani Offen
- Sackler Faculty of Medicine, Tel Aviv University, 6997801, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel-Aviv University, 6997801, Tel Aviv, Israel.,Laboratory of Neuroscience, Felsenstein Medical Research Center, 4910002, Petah Tikva, Israel
| | - John Finberg
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel
| | - Nahum Allon
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel
| | - Moshe Gavish
- The Ruth and Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, 31096, Haifa, Israel.
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Finberg JPM, Aluf Y, Loboda Y, Nakhleh MK, Jeries R, Abud-Hawa M, Zubedat S, Avital A, Khatib S, Vaya J, Haick H. Altered Volatile Organic Compound Profile in Transgenic Rats Bearing A53T Mutation of Human α-Synuclein: Comparison with Dopaminergic and Serotonergic Denervation. ACS Chem Neurosci 2018; 9:291-297. [PMID: 29017011 DOI: 10.1021/acschemneuro.7b00318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Early diagnosis of Parkinson's disease (PD) is of great importance due its progressive phenotype. Neuroprotective drugs could potentially slow down disease progression if used at early stages. Previously, we have reported an altered content of volatile organic compounds (VOCs) in the breath of rats following a 50% reduction in striatal dopamine (DA) content induced by 6-hydroxydopamine. We now report on the difference in the breath-print and content of VOCs between rats with mild and severe lesions of DA neurons, serotonergic neuronal lesions, and transgenic (Tg) rats carrying the PD-producing A53T mutation of the SNCA (α-synuclein) gene. The Tg rats had an increased content of 3-octen-1-ol and 4-chloro-3-methyl phenol in blood, while in brain tissue, hexanal, hexanol, and 2,3-octanedione were present in controls but absent in Tg rats. Levels of 1-heptyl-2-methyl cyclopropane were increased in brain tissue of Tg rats. The data confirm the potential of breath analysis for detection of human idiosyncratic as well as autosomal dominant PD.
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Affiliation(s)
- John P. M. Finberg
- Neuroscience Department,
Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Yuval Aluf
- Neuroscience Department,
Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Yelena Loboda
- Neuroscience Department,
Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Morad K. Nakhleh
- Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Raneen Jeries
- Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Manal Abud-Hawa
- Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Salman Zubedat
- Neuroscience Department,
Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Avi Avital
- Neuroscience Department,
Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Soliman Khatib
- Laboratory of Natural Medicinal Compounds, Migal-Galilee Research
Institute, Kiryat Shmona and Tel Hai College, Qiryat Shemona, 1220800, Israel
| | - Jacob Vaya
- Laboratory of Natural Medicinal Compounds, Migal-Galilee Research
Institute, Kiryat Shmona and Tel Hai College, Qiryat Shemona, 1220800, Israel
| | - Hossam Haick
- Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
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Ben Yakir-Blumkin M, Loboda Y, Schächter L, Finberg JPM. Neuroprotective effect of weak static magnetic fields in primary neuronal cultures. Neuroscience 2014; 278:313-26. [PMID: 25171788 DOI: 10.1016/j.neuroscience.2014.08.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 12/07/2013] [Revised: 08/13/2014] [Accepted: 08/19/2014] [Indexed: 12/20/2022]
Abstract
Low intensity static magnetic fields (SMFs) interact with various biological tissues including the CNS, thereby affecting key biological processes such as gene expression, cell proliferation and differentiation, as well as apoptosis. Previous studies describing the effect of SMFs on apoptotic cell death in several non-neuronal cell lines, emphasize the importance of such a potential modulation in the case of neurodegenerative disorders, where apoptosis constitutes a major route via which neurons degenerate and die. In this study, we examine the effect of SMFs on neuronal survival in primary cortical and hippocampal neurons that constitute a suitable experimental system for modeling the neurodegenerative state in vitro. We show that weak SMF exposure interferes with the apoptotic programing in rat primary cortical and hippocampal neurons, thereby providing protection against etoposide-induced apoptosis in a dose- and time-dependent manner. Primary cortical neurons exposed to SMF (50G) for 7days exhibited a 57.1±6.3% decrease in the percentage of cells undergoing apoptosis induced by etoposide (12μM), accompanied by a marked decrease in the expression of the pro-apoptotic markers: cleaved poly ADP ribose polymerase-1, cleaved caspase-3, active caspase-9 and the phospho-histone H2A variant (Ser139) by 41.0±5.0%, 81.2±5.0%, 72.9±6.4%, 42.75±2.9%, respectively, and by a 57.2±1.0% decrease in the extent of mitochondrial membrane potential collapse. Using the L-type voltage-gated Ca(2+) channel inhibitor nifedipine, which is selective to Ca(2+) influx through Cav1.2, we found that the anti-apoptotic effect of SMFs was mediated by Ca(2+) influx through these channels. Our findings demonstrating altered Ca(2+)-influx in response to thapsigargin stimulation in SMF-exposed cortical neurons, along with enhanced inhibition of KCl-induced Ca(2+)-influx through Cav1.2 channels and enhanced expression of Cav1.2 and Cav1.3 channels, allude to the involvement of voltage- and store-operated Ca(2+) channels in various aspects of the protective effect exerted by SMFs. These findings show the potential susceptibility of the CNS to weak SMF exposure and have implications for the design of novel strategies for the treatment and/or prevention of neurodegenerative diseases.
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Affiliation(s)
- M Ben Yakir-Blumkin
- Department of Molecular Pharmacology, Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, 31096 Haifa, Israel.
| | - Y Loboda
- Department of Molecular Pharmacology, Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, 31096 Haifa, Israel.
| | - L Schächter
- Faculty of Electrical Engineering, Technion - Israel Institute of Technology, 32000 Haifa, Israel.
| | - J P M Finberg
- Department of Molecular Pharmacology, Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, 31096 Haifa, Israel.
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Sader-Mazbar O, Loboda Y, Rabey MJ, Finberg JPM. Increased L-DOPA-derived dopamine following selective MAO-A or -B inhibition in rat striatum depleted of dopaminergic and serotonergic innervation. Br J Pharmacol 2014; 170:999-1013. [PMID: 23992249 DOI: 10.1111/bph.12349] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [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: 01/16/2013] [Revised: 06/20/2013] [Accepted: 07/19/2013] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Selective MAO type B (MAO-B) inhibitors are effective in potentiation of the clinical effect of L-DOPA in Parkinson's disease, but dopamine (DA) is deaminated mainly by MAO type A (MAO-A) in rat brain. We sought to clarify the roles of MAO-A and MAO-B in deamination of DA formed from exogenous L-DOPA in rat striatum depleted of dopaminergic, or both dopaminergic and serotonergic innervations. We also studied the effect of organic cation transporter-3 (OCT-3) inhibition by decinium-22 on extracellular DA levels following L-DOPA. EXPERIMENTAL APPROACH Striatal dopaminergic and/or serotonergic neuronal innervations were lesioned by 6-hydroxydopamine or 5,7-dihydroxytryptamine respectively. Microdialysate DA levels after systemic L-DOPA were measured after inhibition of MAO-A or MAO-B by clorgyline or rasagiline respectively. MAO subtype localization in the striatum was determined by immunofluorescence. KEY RESULTS Rasagiline increased DA extracellular levels following L-DOPA to a greater extent in double- than in single-lesioned rats (2.8- and 1.8-fold increase, respectively, relative to saline treatment); however, clorgyline elevated DA levels in both models over 10-fold. MAO-A was strongly expressed in medium spiny neurons (MSNs) in intact and lesioned striata, while MAO-B was localized in glia and to a small extent in MSNs. Inhibition of OCT-3 increased DA levels in the double- more than the single-lesion animals. CONCLUSIONS AND IMPLICATIONS In striatum devoid of dopaminergic and serotonergic inputs, most deamination of L-DOPA-derived DA is mediated by MAO-A in MSN and a smaller amount by MAO-B in both MSN and glia. OCT-3 plays a significant role in uptake of DA from extracellular space. Inhibitors of OCT-3 are potential future targets for anti-Parkinsonian treatments.
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Affiliation(s)
- O Sader-Mazbar
- Department of Molecular Pharmacology, Rappaport Faculty of Medicine, Technion, Haifa, Israel
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Aluf Y, Vaya J, Khatib S, Loboda Y, Finberg JPM. Selective inhibition of monoamine oxidase A or B reduces striatal oxidative stress in rats with partial depletion of the nigro-striatal dopaminergic pathway. Neuropharmacology 2012; 65:48-57. [PMID: 22982254 DOI: 10.1016/j.neuropharm.2012.08.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 08/22/2012] [Accepted: 08/26/2012] [Indexed: 10/27/2022]
Abstract
Partial lesion (50%) of the nigro-striatal dopaminergic pathway induces compensatory increase in dopamine release from the remaining neurons and increased extracellular oxidative stress (OS(-ec)) in the striatum. The present study was designed to explore the role of monoamine oxidase types A and B (MAO-A, MAO-B) in producing this increased oxidative stress. Lesion of the dopaminergic pathways in the CNS was produced in rats by intra-cerebroventricular injection of 6-hydroxydopamine (6-OHDA; 250 μg) and striatal microdialysis was carried out 5 weeks later. Striatal OS(ec) was determined by measurement of oxidized derivatives of the marker molecule N-linoleyl-tyrosine. Striatal tissue MAO-A activity was unchanged by 6-OHDA lesion but MAO-B activity was increased by 16%, together with a 45% increase in glial cell content. The selective MAO-B inhibitor rasagiline (0.05 mg/kg s.c. daily for 14 days) did not affect microdialysate dopamine concentration [DA(ec)] in sham-operated rats, but decreased OS(ec) by 30%. In lesioned rats, rasagiline decreased [DA(ec)] by 42% with a 49% reduction in OS(ec). The decrease in [DA(ec)] was reversed by the dopamine D2 receptor antagonist sulpiride (10 mg/kg s.c.). The selective MAO-A inhibitor clorgyline (0.2 mg/kg s.c. daily for 14 days) increased striatal [DA(ec)] by 72% in sham-operated rats with no change in OS(ec). In lesioned rats clorgyline increased [DA(ec)] by 66% and decreased OS(ec) by 44%. Rasagiline and clorgyline were effective to a similar extent in reduction of tissue levels of 7-ketocholesterol and the ratio GSSG/GSH, indicative of reduced intracellular oxidative stress level. This data implies that gliosis in our 6-OHDA animals together with inhibition of glial cell MAO-B by rasagiline causes an increase in local levels of dopamine at the presynaptic receptors, and a reduction in dopamine release (and in [DA(ec)]) by presynaptic inhibition. Moreover, inhibition of MAO-A or MAO-B reduces the enhanced level of oxidative stress in the lesioned striatum, and while both clorgyline and rasagiline reduced DA oxidative metabolism, rasagiline possesses an additional antioxidant property, not only that resulting from MAO inhibition.
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Affiliation(s)
- Yuval Aluf
- Department of Molecular Pharmacology, Rappaport Medical Faculty, Technion, Haifa, Israel
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Kemeny S, Dery D, Loboda Y, Rovner M, Lev T, Zuri D, Finberg JPM, Larisch S. Parkin promotes degradation of the mitochondrial pro-apoptotic ARTS protein. PLoS One 2012; 7:e38837. [PMID: 22792159 PMCID: PMC3392246 DOI: 10.1371/journal.pone.0038837] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 05/11/2012] [Indexed: 01/11/2023] Open
Abstract
Parkinson's disease (PD) is associated with excessive cell death causing selective loss of dopaminergic neurons. Dysfunction of the Ubiquitin Proteasome System (UPS) is associated with the pathophysiology of PD. Mutations in Parkin which impair its E3-ligase activity play a major role in the pathogenesis of inherited PD. ARTS (Sept4_i2) is a mitochondrial protein, which initiates caspase activation upstream of cytochrome c release in the mitochondrial apoptotic pathway. Here we show that Parkin serves as an E3-ubiquitin ligase to restrict the levels of ARTS through UPS-mediated degradation. Though Parkin binds equally to ARTS and Sept4_i1 (H5/PNUTL2), the non-apoptotic splice variant of Sept4, Parkin ubiquitinates and degrades only ARTS. Thus, the effect of Parkin on ARTS is specific and probably related to its pro-apoptotic function. High levels of ARTS are sufficient to promote apoptosis in cultured neuronal cells, and rat brains treated with 6-OHDA reveal high levels of ARTS. However, over-expression of Parkin can protect cells from ARTS-induced apoptosis. Furthermore, Parkin loss-of-function experiments reveal that reduction of Parkin causes increased levels of ARTS and apoptosis. We propose that in brain cells in which the E3-ligase activity of Parkin is compromised, ARTS levels increase and facilitate apoptosis. Thus, ARTS is a novel substrate of Parkin. These observations link Parkin directly to a pro-apoptotic protein and reveal a novel connection between Parkin, apoptosis, and PD.
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Affiliation(s)
- Stav Kemeny
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
- Department of Molecular Pharmacology, The Ruth and Bruce Rappaport Faculty of Medicine, Technion – Israel Institute of Technology, Bat-Galim, Haifa, Israel
| | - Dikla Dery
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
| | - Yelena Loboda
- Department of Molecular Pharmacology, The Ruth and Bruce Rappaport Faculty of Medicine, Technion – Israel Institute of Technology, Bat-Galim, Haifa, Israel
| | - Marshall Rovner
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
| | - Tali Lev
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
| | - Dotan Zuri
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
| | - John P. M. Finberg
- Department of Molecular Pharmacology, The Ruth and Bruce Rappaport Faculty of Medicine, Technion – Israel Institute of Technology, Bat-Galim, Haifa, Israel
| | - Sarit Larisch
- Cell Death Research Laboratory, Department of Biology, Faculty of Sciences, University of Haifa, Mount Carmel, Haifa, Israel
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Finberg JPM, Gluzman Z, Reshef M, Loboda Y, Mohsen U, Bressler-Stramer T, Miari R, Gepstein L, Marom S, Feld Y. Modulation of excessive neuronal activity by fibroblasts: potential use in treatment of Parkinson's disease. Restor Neurol Neurosci 2011; 28:803-15. [PMID: 21209495 DOI: 10.3233/rnn-2010-0551] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE A number of neurological disorders are marked by increased or aberrant frequency of neuronal discharge in specific parts of the brain. Administration of drugs such as antiepileptic compounds results in the depression of neuronal activity in the whole brain, with the potential for serious side-effects. In the search for additional therapies to reduce the unphysiological electrical activity of over-active brain foci, we have examined the effect of fibroblasts transplanted to areas responsible for motor dysfunction in hemi-parkinsonian rats, since bursting synchronous discharges in internal segment of globus pallidus (GPi) are thought to be partially responsible for the movement disorders of PD. Fibroblasts express gap junctions and ion channels, and so, when transplanted to brain tissue, can potentially modulate excessive electrical activity. METHODS Neonatal cortical neurons were cultured on multi-electrode arrays, and their electrical activity was evaluated before and after fibroblast seeding. Unilateral 6-hydroxydopamine (6-OHDA) lesion was carried out in Fischer rats. Lesioned or control rats were transplanted with either syngeneic dermal fibroblasts, microfine glass beads, ibotenic acid, or physiological saline, in the entopeduncular nucleus (EP). Apomorphine-induced rotational behavior and L-dopa-induced dyskinetic movements were evaluated before transplantation (baseline) and 2, 4, 8, 12, and 24 weeks following transplantation. Following behavioral experiments, rats were perfused with 4% formaldehyde in PBS for immunohistochemical study of the brain. RESULTS We demonstrate in vitro that the introduction of fibroblasts into a network of neurons does not interfere with overall functional measures of activity, while moderately altering the characteristics of synchronous neuronal discharge. In rats with unilateral 6-hydroxydopamine lesions of the nigro-striatal dopaminergic pathway, apomorphine-induced rotations were reduced by more than 60% following ipsilateral transplantation of fibroblasts to the EP. L-Dopa-induced dyskinesia was also significantly reduced. Transplantation of inert microspheres, or chemical lesion of the same area with ibotenic acid, did not produce beneficial effects on parkinsonian symptomatology. CONCLUSION Fibroblast transplantation could be an alternative treatment strategy for the parkinsonian patient.
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Affiliation(s)
- John P M Finberg
- Molecular Pharmacology Department, Rappaport Faculty of Medicine, Technion, Haifa, Israel
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Aluf Y, Vaya J, Khatib S, Loboda Y, Kizhner S, Finberg JPM. Specific oxidative stress profile associated with partial striatal dopaminergic depletion by 6-hydroxydopamine as assessed by a novel multifunctional marker molecule. Free Radic Res 2010; 44:635-44. [DOI: 10.3109/10715761003692529] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Finberg JPM, Gross A, Bar-Am O, Friedman R, Loboda Y, Youdim MBH. Cardiovascular responses to combined treatment with selective monoamine oxidase type B inhibitors and L-DOPA in the rat. Br J Pharmacol 2006; 149:647-56. [PMID: 17016505 PMCID: PMC2014654 DOI: 10.1038/sj.bjp.0706908] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2005] [Revised: 07/03/2006] [Accepted: 08/18/2006] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Postural hypotension is a common side-effect of L-DOPA treatment of Parkinson's disease, and may be potentiated when L-DOPA is combined with selegiline, a selective inhibitor of monoamine oxidase B (MAO-B). Rasagiline is a new, potent and selective MAO-B inhibitor, which does not possess the sympathomimetic effects of selegiline. We have studied the effects of these selective MAO inhibitors, L-DOPA and dopamine on the cardiovascular system of the rat. EXPERIMENTAL APPROACH Blood pressure and heart rate was measured in conscious rats following acute or chronic administration of rasagiline, selegiline and L-DOPA, by comparison with the selective MAO-A inhibitor clorgyline, or the MAO-A/B inhibitor tranylcypromine. Cardiovascular responses, catecholamine release, and modification of pressor response to dopamine were studied in pithed rats. KEY RESULTS In conscious rats neither rasagiline nor selegiline caused significant potentiation of the effects of L-DOPA (50, 100, 150 mg.kg(-1)) on blood pressure or heart rate at doses which selectively inhibited MAO-B, but L-DOPA responses were potentiated by clorgyline and tranylcypromine. In rats treated twice daily for 8 days with L-DOPA and carbidopa, selegiline (5 mg.kg(-1)) but not rasagiline (0.2 mg.kg(-1)) caused a significant hypotensive response to L-DOPA and carbidopa, although both drugs caused similar inhibition of MAO-A and MAO-B. In pithed rats, selegiline but not rasagiline increased catecholamine release and heart rate, and potentiated dopamine pressor response at MAO-B selective dose. CONCLUSIONS AND IMPLICATIONS The different responses to the two MAO-B inhibitors may be explained by the amine releasing effect of amphetamine metabolites formed from selegiline.
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Affiliation(s)
- J P M Finberg
- Department of Pharmacology, Rappaport Family Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.
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