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Chakrabarti S, Bisaglia M. Oxidative Stress and Neuroinflammation in Parkinson's Disease: The Role of Dopamine Oxidation Products. Antioxidants (Basel) 2023; 12:antiox12040955. [PMID: 37107329 PMCID: PMC10135711 DOI: 10.3390/antiox12040955] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/14/2023] [Accepted: 04/17/2023] [Indexed: 04/29/2023] Open
Abstract
Parkinson's disease (PD) is a chronic neurodegenerative condition affecting more than 1% of people over 65 years old. It is characterized by the preferential degeneration of nigrostriatal dopaminergic neurons, which is responsible for the motor symptoms of PD patients. The pathogenesis of this multifactorial disorder is still elusive, hampering the discovery of therapeutic strategies able to suppress the disease's progression. While redox alterations, mitochondrial dysfunctions, and neuroinflammation are clearly involved in PD pathology, how these processes lead to the preferential degeneration of dopaminergic neurons is still an unanswered question. In this context, the presence of dopamine itself within this neuronal population could represent a crucial determinant. In the present review, an attempt is made to link the aforementioned pathways to the oxidation chemistry of dopamine, leading to the formation of free radical species, reactive quinones and toxic metabolites, and sustaining a pathological vicious cycle.
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Affiliation(s)
- Sasanka Chakrabarti
- Department of Biochemistry and Central Research Laboratory, Maharishi Markandeshwar Institute of Medical Sciences and Research, Maharishi Markandeshwar University (Deemed to be), Mullana, Ambala 133207, India
| | - Marco Bisaglia
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
- Study Center for Neurodegeneration (CESNE), 35121 Padova, Italy
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2
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Roostaee M, Beitollahi H, Sheikhshoaie I. Simultaneous Determination of Dopamine and Uric Acid in Real Samples Using a Voltammetric Nanosensor Based on Co-MOF, Graphene Oxide, and 1-Methyl-3-butylimidazolium Bromide. MICROMACHINES 2022; 13:mi13111834. [PMID: 36363855 PMCID: PMC9697397 DOI: 10.3390/mi13111834] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/30/2022] [Accepted: 10/01/2022] [Indexed: 05/27/2023]
Abstract
A chemically modified carbon paste electrode, based on a CoMOF-graphene oxide (GO) and an ionic liquid of 1-methyl-3-butylimidazolium bromide (CoMOF-GO/1-M,3-BB/CPE), was fabricated for the simultaneous determination of dopamine (DA) and uric acid (UA). The prepared CoMOF/GO nanocomposite was characterized by field emission-scanning electron microscopy (FE-SEM), the X-ray diffraction (XRD) method, a N2 adsorption-desorption isotherm, and an energy dispersive spectrometer (EDS). The electrochemical sensor clearly illustrated catalytic activity towards the redox reaction of dopamine (DA), which can be authenticated by comparing the increased oxidation peak current with the bare carbon paste electrode. The CoMOF-GO/1-M,3-BB/CPE exhibits a wide linear response for DA in the concentration range of 0.1 to 300.0 µM, with a detection limit of 0.04 µM. The oxidation peaks' potential for DA and uric acid (UA) were separated well in the mixture containing the two compounds. This study demonstrated a simple and effective method for detecting DA and UA in real samples.
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Affiliation(s)
- Maryam Roostaee
- Department of Chemistry, Faculty of Science, Shahid Bahonar University of Kerman, Kerman 76175-133, Iran
| | - Hadi Beitollahi
- Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman 7631885356, Iran
| | - Iran Sheikhshoaie
- Department of Chemistry, Faculty of Science, Shahid Bahonar University of Kerman, Kerman 76175-133, Iran
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3
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Reddy N, Dicce A, ma Y, Chen L, Chai K, Fang J. Crystalline H-Aggregate Nanoparticles for Detecting Dopamine Release from M17 Human Neuroblastoma Cells. J Mater Chem B 2022; 10:8024-8032. [DOI: 10.1039/d2tb01450e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dopamine (DA) is an important neurotransmitter, which is essential for transmitting signals in neuronal communications. The deficiency of DA release from neurons is implicated in neurological disorders. Therefore, there has...
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Decreased Brain pH and Pathophysiology in Schizophrenia. Int J Mol Sci 2021; 22:ijms22168358. [PMID: 34445065 PMCID: PMC8395078 DOI: 10.3390/ijms22168358] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/30/2021] [Accepted: 07/30/2021] [Indexed: 12/26/2022] Open
Abstract
Postmortem studies reveal that the brain pH in schizophrenia patients is lower than normal. The exact cause of this low pH is unclear, but increased lactate levels due to abnormal energy metabolism appear to be involved. Schizophrenia patients display distinct changes in mitochondria number, morphology, and function, and such changes promote anaerobic glycolysis, elevating lactate levels. pH can affect neuronal activity as H+ binds to numerous proteins in the nervous system and alters the structure and function of the bound proteins. There is growing evidence of pH change associated with cognition, emotion, and psychotic behaviors. Brain has delicate pH regulatory mechanisms to maintain normal pH in neurons/glia and extracellular fluid, and a change in these mechanisms can affect, or be affected by, neuronal activities associated with schizophrenia. In this review, we discuss the current understanding of the cause and effect of decreased brain pH in schizophrenia based on postmortem human brains, animal models, and cellular studies. The topic includes the factors causing decreased brain pH in schizophrenia, mitochondria dysfunction leading to altered energy metabolism, and pH effects on the pathophysiology of schizophrenia. We also review the acid/base transporters regulating pH in the nervous system and discuss the potential contribution of the major transporters, sodium hydrogen exchangers (NHEs), and sodium-coupled bicarbonate transporters (NCBTs), to schizophrenia.
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5
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Shah T, Narasimhan M, Rathinam ML, Relle K, Kim M, Muthukumar T, Tharpe W, Bartolome S, Mahimainathan L, Muthukumar A. Variable Creatinine Levels in Critical Care Patients: A Concerning Knowledge Gap. J Clin Med 2021; 10:jcm10081689. [PMID: 33920766 PMCID: PMC8071156 DOI: 10.3390/jcm10081689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/31/2021] [Accepted: 04/11/2021] [Indexed: 11/16/2022] Open
Abstract
An accurate creatinine (Cr) estimate is pivotal for the assessment of renal function. Both patient- and practice-spawned factors palliate the test accuracy of serum creatinine (sCr) and can erratically represent actual kidney function. This study evaluated the caregivers’ awareness of enzymatic serum creatinine (E-sCr) assay interfering in dopamine/dobutamine (DD)-infused patient samples and the frequency of such interference in a critical care setting. We conducted an sCr awareness survey among UT Southwestern physicians, nurses, and pharmacists. We then performed a cross-sectional E-sCr comparison against the kinetic Jaffe method using the DD-infused patient samples collected from central venous catheters (CVC), peripherally inserted central catheter (PICC) lines, and the peripheral vein (PV). We retrospectively compared the longitudinal E-sCr results of the CVC/PICC draws with the corresponding blood urea nitrogen (BUN) levels. The survey results show a significant lack of awareness among caregivers about the negative interference of DD infusions on E-sCr. Cross-sectional E-sCr assessment relative to the Jaffe method displayed a negative interference in 12% of CVC/PICC line samples (7/57 DD-infused patients) compared to none in the PV draws. A longitudinal assessment of E-sCr, BUN, and potassium (K) levels from CVC/PICC line samples further confirmed a spurious decrease for E-sCr in about 12/50 (24%) patients who did not show a concurrent BUN or K decrease. The results suggest that a direct PV sampling accompanied by clinical laboratory-directed proactive discussion/activities can foster awareness among caregivers and eschew the false E-sCr estimates in DD-infused patients.
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Affiliation(s)
- Trushil Shah
- Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (T.S.); (S.B.)
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Madhusudhanan Narasimhan
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (M.N.); (L.M.)
| | - Mary Latha Rathinam
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Karen Relle
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Melanie Kim
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Tharani Muthukumar
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Richardson, TX 75080, USA;
| | - William Tharpe
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Sonja Bartolome
- Department of Internal Medicine, Pulmonary and Critical Care Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (T.S.); (S.B.)
- William P. Clements Jr. University Hospital (CUH), University of Texas Southwestern Medical Center, Dallas, TX 75235, USA; (M.L.R.); (K.R.); (M.K.); (W.T.)
| | - Lenin Mahimainathan
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (M.N.); (L.M.)
| | - Alagarraju Muthukumar
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; (M.N.); (L.M.)
- Correspondence: ; Tel.: +1-214-645-5103
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Di Gioia S, Trapani A, Cassano R, Di Gioia ML, Trombino S, Cellamare S, Bolognino I, Hossain MN, Sanna E, Trapani G, Conese M. Nose-to-brain delivery: A comparative study between carboxymethyl chitosan based conjugates of dopamine. Int J Pharm 2021; 599:120453. [PMID: 33675929 DOI: 10.1016/j.ijpharm.2021.120453] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/26/2021] [Accepted: 02/27/2021] [Indexed: 11/25/2022]
Abstract
Herein, the synthesis of a novel polymeric conjugate N,O-CMCS-Dopamine (DA) based on an amide linkage is reported. The performances of this conjugate were compared with those of an analogous N,O-CMCS-DA ester conjugate previously studied (Cassano et al., 2020) to gain insight into their potential utility for Parkinson's disease treatment. The new amide conjugate was synthesized by standard carbodiimide coupling procedure and characterized by FT-IR, 1H NMR spectroscopies and thermal analysis (Differential Scanning Calorimetry). In vitro mucoadhesive studies in simulated nasal fluid (SNF) evidenced high adhesive effect of both ester and amide conjugates. Results demonstrated that the amide conjugate exerted an important role to prevent DA spontaneous autoxidation both under stressed conditions and physiological mimicking ones. MTT test indicated cytocompatibility of the amide conjugate with Olfactory Ensheating Cells (OECs), which were shown by cytofluorimetry to internalize efficiently the conjugate. Overall, among the two conjugates herein studied, the N,O-CMCS-DA amide conjugate seems a promising candidate for improving the delivery of DA by nose-to-brain administration.
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Affiliation(s)
- Sante Di Gioia
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
| | - Adriana Trapani
- Department of Pharmacy-Drug Sciences, University of Bari "Aldo Moro", 70125 Bari, Italy.
| | - Roberta Cassano
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Cosenza, Italy.
| | - Maria Luisa Di Gioia
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Sonia Trombino
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Saverio Cellamare
- Department of Pharmacy-Drug Sciences, University of Bari "Aldo Moro", 70125 Bari, Italy
| | - Isabella Bolognino
- Department of Pharmacy-Drug Sciences, University of Bari "Aldo Moro", 70125 Bari, Italy
| | - Md Niamat Hossain
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
| | - Enrico Sanna
- Department of Life and Environmental Sciences, Section of Neuroscience and Anthropology, University of Cagliari, Monserrato, Cagliari, Italy
| | - Giuseppe Trapani
- Department of Pharmacy-Drug Sciences, University of Bari "Aldo Moro", 70125 Bari, Italy
| | - Massimo Conese
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
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7
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Chavoshi N, Hemmateenejad B. Fluorescent Carbon Dots Prepared from Hazelnut Kohl as an Affordable Probe for Determination of Dopamine. J Fluoresc 2021; 31:455-463. [PMID: 33417108 DOI: 10.1007/s10895-020-02668-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 12/28/2020] [Indexed: 01/21/2023]
Abstract
In this investigation, a simple, green and facile fluorescence mrtod using carbon dots (CDs) of hazelnut kohl is described for selective detection of dopamine (DA). The sensing system is based on hazelnut kohl (the black soot of kohl) which is used as a carbon source. Generally, kohl is a traditional eye cosmetic that used in different parts of the world and synthesized by the combustion process like burning natural materials. Here, it has been proven that black soot (kohl) obtained from hazelnut has a carbon dot structure and can be used for sensory applications. Some characterization methods are carried out to reveal the kohl structure. Also, the photoluminescence properties of the prepared CDs of kohl are investigated. It is found that the size of CDs is 2-4 nm. Besides, under the optimal conditions, the fluorescence of CDs is used for DA determination. CDs fluorescence intensity is decreased linearly with the increase of DA concentration. By using the fluorescence dependency toward the DA concentration, DA can be determined in the range 0.5-30 μM with the limit of detection of 0.30 μM. Finally, this method is successfully applied to discriminate the DA in the real samples (healthy human serum and cerebrospinal fluid (CSF)) which shows acceptable efficiently for diagnostic purposes. The fluorescence of carbon dots, prepared from Hazelnut Kohl, is quenched in the presence of dopamine.
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Affiliation(s)
- Neda Chavoshi
- Chemistry Department, Shiraz University, Shiraz, Iran
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8
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Xie S, Li X, Wang L, Zhu F, Zhao X, Yuan T, Liu Q, Chen X. High quantum-yield carbon dots embedded metal-organic frameworks for selective and sensitive detection of dopamine. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105718] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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9
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Mathimaran A, Kumar A, Prajapati G, Ampapathi RS, Bora HK, Guha R. Partially saturated canthaxanthin alleviates aging-associated oxidative stress in D-galactose administered male wistar rats. Biogerontology 2020; 22:19-34. [PMID: 32926226 DOI: 10.1007/s10522-020-09898-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 09/05/2020] [Indexed: 01/03/2023]
Abstract
It has been earlier reported that partially saturated canthaxanthin (PSC) from Aspergillus carbonarius mutant is non-toxic, has anti-lipid peroxidation activity and can induce apoptosis in prostate cancer cell lines. In the present study, the antiaging effect of PSC was explored in D-galactose administered male wistar rats. 8-10 weeks old, male wistar rats were randomly divided into (i) Vehicle Control Group (VCG), (ii) Aged Control Group (ACG), (iii) Aged + α Lipoic Acid Group (ALG) and (iv) Aged + Partially saturated canthaxanthin Group (APG). Rats received D-galactose (300 mg /kg bwt/day; i.p.) alone (ACG) or together with PSC (APG) (20 mg/kg bwt/day; oral) and α Lipoic Acid (ALG) (80 mg/kg bwt/day; oral) for 10 weeks. Rats in VCG were injected with the same volume of physiological saline (i.p.) and fed with olive oil (vehicle). In vitro protein oxidation and DNA oxidation inhibition, in vivo malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), catalase (CAT), acetylcholinesterase (AChE) and monoamine oxidase (MAO) activities were determined. In addition, brain neurotransmitters, dopamine and serotonin were estimated by NMR. PSC treatment showed inhibition against protein and DNA oxidation. PSC effectively improved D-galactose induced aging rats by inducing a protective effect through up-regulation of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT) and brain neurotransmitters and downregulated malondialdehyde (MDA) and monoamineoxidase (MAO) levels. Thus, PSC appears to be a functional compound having antioxidant and antiaging properties.
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Affiliation(s)
- Ahila Mathimaran
- Department of Biotechnology, Periyar Maniammai Institute of Science & Technology, Vallam, Thanjavur, Tamil Nadu, India.,Laboratory Animal Facility, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Anbarasu Kumar
- Department of Biotechnology, Periyar Maniammai Institute of Science & Technology, Vallam, Thanjavur, Tamil Nadu, India.
| | - Gurudayal Prajapati
- Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Ravi S Ampapathi
- Sophisticated Analytical Instrument Facility, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India.,CSIR-Academy of Scientific and Innovative Research (CSIR-AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Himangsu K Bora
- Laboratory Animal Facility, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Rajdeep Guha
- Laboratory Animal Facility, CSIR-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India. .,CSIR-Academy of Scientific and Innovative Research (CSIR-AcSIR), Ghaziabad, Uttar Pradesh, India.
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10
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Reddy N, Rhodes S, Fang J. Colorimetric Detection of Dopamine with J-Aggregate Nanotube-Integrated Hydrogel Thin Films. ACS OMEGA 2020; 5:18198-18204. [PMID: 32743194 PMCID: PMC7392377 DOI: 10.1021/acsomega.0c01803] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 07/03/2020] [Indexed: 06/11/2023]
Abstract
The deficiency of dopamine (DA) is clinically linked to several neurological diseases. The detection of urinary DA provides a noninvasive method for diagnosing these diseases and monitoring therapies. In this paper, we report the coassembly of lithocholic acid (LCA) and 3,3'-diethythiadicarbocyanine iodide (DiSC2(5)) at the equimolar ratio in ammonia solution into J-aggregate nanotubes. By integrating the J-aggregate nanotubes into transparent agarose hydrogel films formed on the wall of quartz cuvettes, we fabricate a portable and reproducible sensor platform for the optical detection of DA in synthetic urine. The J-band intensity of the integrated J-aggregate nanotubes is found to linearly decrease with the increase of DA concentrations from 10 to 80 nM, giving the limit of detection of ∼7 nM. The detection mechanism is based on the photoinduced electron transfer (PET) from the excited J-aggregate nanotubes to adsorbed DA-quinone. The PET process used in the sensor platform can reduce the interference of ascorbic acid and uric acid in the detection of DA in synthetic urine. The high sensitivity of the sensor platform is contributed by the delocalized exciton of J-aggregate nanotubes.
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Yoshioka Y, Sugino Y, Shibagaki F, Yamamuro A, Ishimaru Y, Maeda S. Dopamine attenuates lipopolysaccharide-induced expression of proinflammatory cytokines by inhibiting the nuclear translocation of NF-κB p65 through the formation of dopamine quinone in microglia. Eur J Pharmacol 2019; 866:172826. [PMID: 31790652 DOI: 10.1016/j.ejphar.2019.172826] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/13/2019] [Accepted: 11/28/2019] [Indexed: 01/14/2023]
Abstract
Many reports have indicated that dopamine has immunomodulatory effects on peripheral immune cells. The purpose of this study was to reveal the immunomodulatory effect of dopamine on the expression of proinflammatory cytokines in microglial cells, which are the immune cells of the central nervous system. In murine microglial cell line BV-2 cells, pretreatment with dopamine for 24 h attenuated the lipopolysaccharide (LPS)-induced expression of proinflammatory cytokines such as tumor-necrosis factor-α, interleukin-1β, and interleukin-6. Neither (5R)-8-chloro-3-methyl-5-phenyl-1,2,4,5-tetrahydro-3-benzazepin-7-ol; hydrochloride (SCH-23390) nor sulpiride, which are dopamine D1-like and D2-like receptor antagonists, respectively, affected the attenuation of LPS-induced expression of cytokines by dopamine. In addition, pretreatment with neither (-)-(6aR,12bR)-4,6,6a,7,8,12b-Hexahydro-7-methylindolo[4,3-a]phenanthridin (CY208-243) nor bromocriptine, dopamine D1-like and D2-like receptor agonists, respectively, was effective in doing so. However, N-acetylcysteine (NAC), which inhibits dopamine oxidation to dopamine quinone, did inhibit this attenuated expression. Dopamine increased the level of quinoproteins, and this increase was inhibited by NAC. Western blot and immunocytochemical analyses revealed that dopamine inhibited LPS-induced nuclear translocation of nuclear factor-kappa B (NF-κB) p65. Dopamine also attenuated the expression of cytokines and the nuclear translocation of NF-κB p65 induced by LPS in mouse microglial cells in primary culture. These results suggest that dopamine attenuated LPS-induced expression of cytokines by inhibiting the nuclear translocation of NF-κB p65 through the formation of dopamine quinone in microglial cells.
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Affiliation(s)
- Yasuhiro Yoshioka
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
| | - Yuta Sugino
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
| | - Fumiya Shibagaki
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
| | - Akiko Yamamuro
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
| | - Yuki Ishimaru
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
| | - Sadaaki Maeda
- Laboratory of Pharmacotherapeutics, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka, 573-0101, Japan.
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Kruyer A, Ball LE, Townsend DM, Kalivas PW, Uys JD. Post-translational S-glutathionylation of cofilin increases actin cycling during cocaine seeking. PLoS One 2019; 14:e0223037. [PMID: 31550273 PMCID: PMC6759170 DOI: 10.1371/journal.pone.0223037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 09/13/2019] [Indexed: 01/11/2023] Open
Abstract
Neuronal defense against oxidative damage is mediated primarily by the glutathione redox system. Traditionally considered a mechanism to protect proteins from irreversible oxidation, mounting evidence supports a role for protein S-glutathionylation in cell signaling in response to changes in intracellular redox status. Here we determined the specific sites on the actin binding protein cofilin that undergo S-glutathionylation. In addition, we show that S-glutathionylation of cofilin reduces its capacity to depolymerize F-actin. We further describe an assay to determine the S-glutathionylation of target proteins in brain tissue from behaving rodents. Using this technique, we show that cofilin in the rat nucleus accumbens undergoes S-glutathionylation during 15-minutes of cued cocaine seeking in the absence of cocaine. Our findings demonstrate that cofilin S-glutathionylation is increased in response to cocaine-associated cues and that increased cofilin S-glutathionylation reduces cofilin-dependent depolymerization of F-actin. Thus, S-glutathionylation of cofilin may serve to regulate actin cycling in response to drug-conditioned cues.
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Affiliation(s)
- Anna Kruyer
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States of America
- * E-mail: (AK); (JU)
| | - Lauren E. Ball
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, SC, United States of America
| | - Danyelle M. Townsend
- Department of Drug Discovery and Pharmaceutical Sciences, Medical University of South Carolina, Charleston, SC, United States of America
| | - Peter W. Kalivas
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States of America
| | - Joachim D. Uys
- Department of Cell and Molecular Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, SC, United States of America
- * E-mail: (AK); (JU)
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Biosa A, De Lazzari F, Masato A, Filograna R, Plotegher N, Beltramini M, Bubacco L, Bisaglia M. Superoxide Dismutases SOD1 and SOD2 Rescue the Toxic Effect of Dopamine-Derived Products in Human SH-SY5Y Neuroblastoma Cells. Neurotox Res 2019; 36:746-755. [DOI: 10.1007/s12640-019-00078-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/12/2019] [Accepted: 06/14/2019] [Indexed: 01/06/2023]
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14
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Tammina SK, Yang D, Koppala S, Cheng C, Yang Y. Highly photoluminescent N, P doped carbon quantum dots as a fluorescent sensor for the detection of dopamine and temperature. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 194:61-70. [DOI: 10.1016/j.jphotobiol.2019.01.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 12/20/2018] [Accepted: 01/08/2019] [Indexed: 11/25/2022]
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Yu Y, de Campos RPS, Hong S, Krastev DL, Sadanand S, Leung Y, Wheeler AR. A microfluidic platform for continuous monitoring of dopamine homeostasis in dopaminergic cells. MICROSYSTEMS & NANOENGINEERING 2019; 5:10. [PMID: 31057937 PMCID: PMC6409360 DOI: 10.1038/s41378-019-0049-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 01/08/2019] [Accepted: 01/10/2019] [Indexed: 05/24/2023]
Abstract
Homeostasis of dopamine, a classical neurotransmitter, is a key indicator of neuronal health. Dysfunction in the regulation of dopamine is implicated in a long list of neurological disorders, including addiction, depression, and neurodegeneration. The existing methods used to evaluate dopamine homeostasis in vitro are inconvenient and do not allow for continuous non-destructive measurement. In response to this challenge, we introduce an integrated microfluidic system that combines dopaminergic cell culture and differentiation with electroanalytical measurements of extracellular dopamine in real-time at any point during an assay. We used the system to examine the behavior of differentiated SH-SY5Y cells upon exposure to four dopamine transporter ant/agonists (cocaine, ketamine, epigallocatechin gallate, and amphetamine) and study their pharmacokinetics. The IC50 values of cocaine, ketamine, and epigallocatechin gallate were determined to be (average ± standard deviation) 3.7 ± 1.1 µM, 51.4 ± 17.9 µM, and 2.6 ± 0.8 µM, respectively. Furthermore, we used the new system to study amphetamine-mediated dopamine release to probe the related phenomena of dopamine transporter-mediated reverse-transport and dopamine release from vesicles. We propose that this platform, which is the first platform to simultaneously evaluate uptake and release, could be useful to screen for drugs and other agents that target dopaminergic neurons and the function of the dopamine transporter. More broadly, this platform should be adaptable for any application that could benefit from high-temporal resolution electroanalysis combined with multi-day cell culture using small numbers of cells.
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Affiliation(s)
- Yue Yu
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, 164 College St, Toronto, ON M5s 3G9 Canada
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
| | - Richard P. S. de Campos
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
- Department of Chemistry, University of Toronto, 80 St George St., Toronto, ON M5S 3H6 Canada
| | - Seolim Hong
- Department of Human Biology, University of Toronto, 300 Huron Street, Toronto, ON M5S 3J6 Canada
| | - Dimitar L. Krastev
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
- Department of Human Biology, University of Toronto, 300 Huron Street, Toronto, ON M5S 3J6 Canada
| | - Siddharth Sadanand
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
| | - Yen Leung
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
| | - Aaron R. Wheeler
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, 164 College St, Toronto, ON M5s 3G9 Canada
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1 Canada
- Department of Chemistry, University of Toronto, 80 St George St., Toronto, ON M5S 3H6 Canada
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16
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Zhuo S, Guan Y, Li H, Fang J, Zhang P, Du J, Zhu C. Facile fabrication of fluorescent Fe-doped carbon quantum dots for dopamine sensing and bioimaging application. Analyst 2019; 144:656-662. [DOI: 10.1039/c8an01741g] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile Fe-doped carbon quantum dot based fluorescent sensor for dopamine sensing and bioimaging was constructed.
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Affiliation(s)
- Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Yuanyuan Guan
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Hui Li
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Jing Fang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Jinyan Du
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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17
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Ju KY, Fischer MC, Warren WS. Understanding the Role of Aggregation in the Broad Absorption Bands of Eumelanin. ACS NANO 2018; 12:12050-12061. [PMID: 30500158 DOI: 10.1021/acsnano.8b04905] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, we investigate the relationship between the complex hierarchical assembly structure of eumelanin, its characteristic broad absorption band, and the highly unusual nonlinear dynamics revealed by pump-probe or transient absorption microscopy. Melanin-like nanoparticles (MelNPs), generated by spontaneous oxidation of dopamine, were created with uniform but adjustable size distributions, and kinetically controlled oxidation was probed with a wide range of characterization methods. This lets us explore the broad absorption bands of eumelanin models at different assembly levels, such as small subunit fractions (single monomeric and oligomeric units and small oligomer stacks), stacked oligomer fractions (protomolecules), and large-scale aggregates of protomolecules (parental particles). Both the absorption and pump-probe dynamics are very sensitive to these structural differences or to the size of intact particles (a surprising result for an organic polymer). We show that the geometric packing order of protomolecules in long-range aggregation is key secondary interactions to extend the absorption band of eumelanin to the low energy spectrum and produce drastic changes in the transient absorption spectrum.
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Affiliation(s)
- Kuk-Youn Ju
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
| | - Martin C Fischer
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
- Department of Physics , Duke University , Durham , North Carolina 27708 , United States
| | - Warren S Warren
- Department of Chemistry , Duke University , Durham , North Carolina 27708 , United States
- Department of Physics , Duke University , Durham , North Carolina 27708 , United States
- Department of Radiology , Duke University , Durham , North Carolina 27710 , United States
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18
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Du S, Luo Y, Liao Z, Zhang W, Li X, Liang T, Zuo F, Ding K. New insights into the formation mechanism of gold nanoparticles using dopamine as a reducing agent. J Colloid Interface Sci 2018; 523:27-34. [DOI: 10.1016/j.jcis.2018.03.077] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 03/21/2018] [Accepted: 03/23/2018] [Indexed: 11/30/2022]
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19
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Kulchat S, Boonta W, Todee A, Sianglam P, Ngeontae W. A fluorescent sensor based on thioglycolic acid capped cadmium sulfide quantum dots for the determination of dopamine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 196:7-15. [PMID: 29428898 DOI: 10.1016/j.saa.2018.01.062] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/22/2018] [Accepted: 01/23/2018] [Indexed: 06/08/2023]
Abstract
A fluorescent sensor based on thioglycolic acid-capped cadmium sulfide quantum dots (TGA-CdS QDs) has been designed for the sensitive and selective detection of dopamine (DA). In the presence of dopamine (DA), the addition of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxysuccinimide (NHS) activates the reaction between the carboxylic group of the TGA and the amino group of dopamine to form an amide bond, quenching the fluorescence of the QDs. The fluorescence intensity of TGA-CdS QDs can be used to sense the presence of dopamine with a limit of detection of 0.68μM and a working linear range of 1.0-17.5μM. This sensor system shows great potential application for dopamine detection in dopamine drug samples and for future easy-to-make analytical devices.
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Affiliation(s)
- Sirinan Kulchat
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002,Thailand
| | - Wissuta Boonta
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002,Thailand
| | - Apinya Todee
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002,Thailand
| | - Pradthana Sianglam
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002,Thailand
| | - Wittaya Ngeontae
- Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002,Thailand.
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20
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Zwitterionic sulfobetaine polymer-immobilized surface by simple tyrosinase-mediated grafting for enhanced antifouling property. Acta Biomater 2017; 61:169-179. [PMID: 28782724 DOI: 10.1016/j.actbio.2017.08.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 07/28/2017] [Accepted: 08/03/2017] [Indexed: 12/16/2022]
Abstract
Introducing antifouling property to biomaterial surfaces has been considered an effective method for preventing the failure of implanted devices. In order to achieve this, the immobilization of zwitterions on biomaterial surfaces has been proven to be an excellent way of improving anti-adhesive potency. In this study, poly(sulfobetaine-co-tyramine), a tyramine-conjugated sulfobetaine polymer, was synthesized and simply grafted onto the surface of polyurethane via a tyrosinase-mediated reaction. Surface characterization by water contact angle measurements, X-ray photoelectron spectroscopy and atomic force microscopy demonstrated that the zwitterionic polymer was successfully introduced onto the surface of polyurethane and remained stable for 7days. In vitro studies revealed that poly(sulfobetaine-co-tyramine)-coated surfaces dramatically reduced the adhesion of fibrinogen, platelets, fibroblasts, and S. aureus by over 90% in comparison with bare surfaces. These results proved that polyurethane surfaces grafted with poly(sulfobetaine-co-tyramine) via a tyrosinase-catalyzed reaction could be promising candidates for an implantable medical device with excellent bioinert abilities. STATEMENT OF SIGNIFICANCE Antifouling surface modification is one of the key strategy to prevent the thrombus formation or infection which occurs on the surface of biomaterial after transplantation. Although there are many methods to modify the surface have been reported, necessity of simple modification technique still exists to apply for practical applications. The purpose of this study is to modify the biomaterial's surface by simply immobilizing antifouling zwitterion polymer via enzyme tyrosinase-mediated reaction which could modify versatile substrates in mild aqueous condition within fast time period. After modification, pSBTA grafted surface becomes resistant to various biological factors including proteins, cells, and bacterias. This approach appears to be a promising method to impart antifouling property on biomaterial surfaces.
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21
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Lampert C, Arcego DM, de Sá Couto-Pereira N, Dos Santos Vieira A, Toniazzo AP, Krolow R, Garcia E, Vendite DA, Calcagnotto ME, Dalmaz C. Short post-weaning social isolation induces long-term changes in the dopaminergic system and increases susceptibility to psychostimulants in female rats. Int J Dev Neurosci 2017; 61:21-30. [PMID: 28559209 DOI: 10.1016/j.ijdevneu.2017.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/10/2017] [Accepted: 05/24/2017] [Indexed: 12/09/2022] Open
Abstract
Childhood and adolescence are sensitive periods of development, marked by high brain maturation and plasticity. Exposure to early life stress, such as social isolation, is able to prompt changes in sensitive brain circuitries, essentially in the mesolimbic dopaminergic system and increase the risk for addictive behaviors later in life. Post-weaning social isolation can stimulate the consumption of rewarding substances, like drugs of abuse and palatable foods. However, most studies analyze long periods of social isolation and very little is known about the effects of a brief social isolation in a sensitive period of development and its association with palatable food on the reward system sensitization. Furthermore, females are more susceptible to the reinforcing effect of drugs than males. Therefore, the aim of this study was to analyze the effects of a short post-weaning social isolation combined with a free access to a chronic high sugar diet (HSD) on the dopaminergic system, oxidative status and behavioral response to an amphetamine-like drug in adulthood. We used female Wistar rats that were socially isolated from post-natal days (PD) 21 to 35 and received free access to a HSD until PD 60. On PD 65, animals were submitted to a challenge with diethylpropion (DEP), an amphetamine-like drug and different responses were analyzed: locomotor activity, immmunocontent of dopamine related proteins, and the oxidative status in the striatum, before and after the DEP challenge. We showed that a short post-weaning social isolation (SI) increased the locomotor response to DEP, when compared with previous saline administration. Social isolation also increased dopamine transporter, tyrosine hydroxylase, and decreased dopamine D2 receptor immunocontent. Additionally, SI increased the overall oxidative status parameters after the challenge with DEP. Interestingly, the exposure to a HSD prevented the SI effects on locomotor response, but did not interfere in the dopaminergic parameters evaluated, despite having modified some oxidative parameters. This study showed for the first time that a short post-weaning social isolation was able to induce long-term changes in the striatal dopaminergic system and increased the response to psychostimulants. These results emphasize the importance of stressful experiences during a short period of development on programming susceptibility to psychostimulants later in life.
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Affiliation(s)
- Carine Lampert
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
| | - Danusa Mar Arcego
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Natividade de Sá Couto-Pereira
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Aline Dos Santos Vieira
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Ana Paula Toniazzo
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Rachel Krolow
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Emily Garcia
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Deusa Aparecida Vendite
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Maria Elisa Calcagnotto
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Carla Dalmaz
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
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22
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Tung CS, Chang ST, Huang CL, Huang NK. The neurotoxic mechanisms of amphetamine: Step by step for striatal dopamine depletion. Neurosci Lett 2017; 639:185-191. [PMID: 28065841 DOI: 10.1016/j.neulet.2017.01.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/28/2016] [Accepted: 01/03/2017] [Indexed: 11/29/2022]
Abstract
Amphetamine (AMPH) is a commonly abused psychostimulant that induces neuronal cell death/degeneration in humans and experimental animals. Although multiple neurotoxic mechanisms of AMPH have been intensively investigated, the interplay between these mechanisms has remained elusive. In this study, we used a rat model of AMPH-induced long-lasting striatal dopamine (DA) depletion and identified mechanisms of neurotoxicity, energy failure, excitotoxicity, and oxidative stress. Pretreatment with nicotinamide (NAM, a co-factor for the electron transport chain) blocked AMPH-induced free radical formation, energy failure, and striatal DA decrease. Also, MK-801 (a NMDA receptor antagonist) blocked AMPH-induced free radical formation and striatal DA but not energy failure decrease, indicating excitotoxicity may occur before free radical formation and after energy failure. Thus, these results show that during AMPH intoxication, energy failure, excitotoxicity, and free radical formation are orchestrated consecutively to mediate the depletion of striatal DA.
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Affiliation(s)
- Che-Se Tung
- Division of Medical Research and Education, Cheng Hsin General Hospital, Taipei, Taiwan, ROC
| | - Shang-Tang Chang
- Department of Psychiatry, Cardinal Tien Hospital, New Taipei City, Taiwan, ROC
| | - Chuen-Lin Huang
- Medical Research Center, Cardinal Tien Hospital, Hsintien, New Taipei City, Taiwan, ROC; Graduate Institute of Physiology & Department of Physiology and Biophysics, National Defense Medical Center, Taipei, Taiwan, ROC
| | - Nai-Kuei Huang
- Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan, ROC; National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei, Taiwan, ROC.
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23
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Rhodes S, Wang X, Liang W, Cho HJ, Fang J. Templated J-Aggregate Nanotubes for the Detection of Dopamine. ACTA ACUST UNITED AC 2017. [DOI: 10.4236/msce.2017.51018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Ju KY, Kang J, Chang JH, Lee JK. Clue to Understanding the Janus Behavior of Eumelanin: Investigating the Relationship between Hierarchical Assembly Structure of Eumelanin and Its Photophysical Properties. Biomacromolecules 2016; 17:2860-72. [DOI: 10.1021/acs.biomac.6b00686] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kuk-Youn Ju
- Department
of Chemistry, Seoul National University, Seoul 151-747, Korea
| | - Jeeun Kang
- Department
of Electronics Engineering and Sogang Institute of Advanced Technology, Sogang University, Seoul, 121-742, Korea
| | - Jin Ho Chang
- Department
of Electronics Engineering and Sogang Institute of Advanced Technology, Sogang University, Seoul, 121-742, Korea
| | - Jin-Kyu Lee
- Department
of Chemistry, Seoul National University, Seoul 151-747, Korea
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25
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Hildebrandt N, Spillmann CM, Algar WR, Pons T, Stewart MH, Oh E, Susumu K, Díaz SA, Delehanty JB, Medintz IL. Energy Transfer with Semiconductor Quantum Dot Bioconjugates: A Versatile Platform for Biosensing, Energy Harvesting, and Other Developing Applications. Chem Rev 2016; 117:536-711. [DOI: 10.1021/acs.chemrev.6b00030] [Citation(s) in RCA: 457] [Impact Index Per Article: 57.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Niko Hildebrandt
- NanoBioPhotonics
Institut d’Electronique Fondamentale (I2BC), Université Paris-Saclay, Université Paris-Sud, CNRS, 91400 Orsay, France
| | | | - W. Russ Algar
- Department
of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Thomas Pons
- LPEM;
ESPCI Paris, PSL Research University; CNRS; Sorbonne Universités, UPMC, F-75005 Paris, France
| | | | - Eunkeu Oh
- Sotera Defense Solutions, Inc., Columbia, Maryland 21046, United States
| | - Kimihiro Susumu
- Sotera Defense Solutions, Inc., Columbia, Maryland 21046, United States
| | - Sebastian A. Díaz
- American Society for Engineering Education, Washington, DC 20036, United States
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26
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Efficient and biologically relevant consensus strategy for Parkinson's disease gene prioritization. BMC Med Genomics 2016; 9:12. [PMID: 26961748 PMCID: PMC4784386 DOI: 10.1186/s12920-016-0173-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 03/01/2016] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The systemic information enclosed in microarray data encodes relevant clues to overcome the poorly understood combination of genetic and environmental factors in Parkinson's disease (PD), which represents the major obstacle to understand its pathogenesis and to develop disease-modifying therapeutics. While several gene prioritization approaches have been proposed, none dominate over the rest. Instead, hybrid approaches seem to outperform individual approaches. METHODS A consensus strategy is proposed for PD related gene prioritization from mRNA microarray data based on the combination of three independent prioritization approaches: Limma, machine learning, and weighted gene co-expression networks. RESULTS The consensus strategy outperformed the individual approaches in terms of statistical significance, overall enrichment and early recognition ability. In addition to a significant biological relevance, the set of 50 genes prioritized exhibited an excellent early recognition ability (6 of the top 10 genes are directly associated with PD). 40 % of the prioritized genes were previously associated with PD including well-known PD related genes such as SLC18A2, TH or DRD2. Eight genes (CCNH, DLK1, PCDH8, SLIT1, DLD, PBX1, INSM1, and BMI1) were found to be significantly associated to biological process affected in PD, representing potentially novel PD biomarkers or therapeutic targets. Additionally, several metrics of standard use in chemoinformatics are proposed to evaluate the early recognition ability of gene prioritization tools. CONCLUSIONS The proposed consensus strategy represents an efficient and biologically relevant approach for gene prioritization tasks providing a valuable decision-making tool for the study of PD pathogenesis and the development of disease-modifying PD therapeutics.
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27
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Yu Y, Shamsi MH, Krastev DL, Dryden MDM, Leung Y, Wheeler AR. A microfluidic method for dopamine uptake measurements in dopaminergic neurons. LAB ON A CHIP 2016; 16:543-52. [PMID: 26725686 DOI: 10.1039/c5lc01515d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Dopamine (DA) is a classical neurotransmitter and dysfunction in its synaptic handling underlies many neurological disorders, including addiction, depression, and neurodegeneration. A key to understanding DA dysfunction is the accurate measurement of dopamine uptake by dopaminergic neurons. Current methods that allow for the analysis of dopamine uptake rely on standard multiwell-plate based ELISA, or on carbon-fibre microelectrodes used in in vivo recording techniques. The former suffers from challenges associated with automation and analyte degradation, while the latter has low throughput and is not ideal for laboratory screening. In response to these challenges, we introduce a digital microfluidic platform to evaluate dopamine homeostasis in in vitro neuron culture. The method features voltammetric dopamine sensors with limit of detection of 30 nM integrated with cell culture sites for multi-day neuron culture and differentiation. We demonstrate the utility of the new technique for DA uptake assays featuring in-line culture and analysis, with a determination of uptake of approximately ∼32 fmol in 10 min per virtual microwell (each containing ∼200 differentiated SH-SY5Y cells). We propose that future generations of this technique will be useful for drug discovery for neurodegenerative disease as well as for a wide range of applications that would benefit from integrated cell culture and electroanalysis.
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Affiliation(s)
- Yue Yu
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, 164 College St, Toronto, ON M5s 3G9, Canada. and Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1, Canada
| | - Mohtashim H Shamsi
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1, Canada and Department of Chemistry, University of Toronto, 80 St Georg St., Toronto, ON M5S 3H6, Canada
| | - Dimitar L Krastev
- Department of Human Biology, University of Toronto, 300 Huron Street, Toronto, ON M5S 3J6, Canada
| | - Michael D M Dryden
- Department of Chemistry, University of Toronto, 80 St Georg St., Toronto, ON M5S 3H6, Canada
| | - Yen Leung
- Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1, Canada
| | - Aaron R Wheeler
- Institute for Biomaterials and Biomedical Engineering, University of Toronto, 164 College St, Toronto, ON M5s 3G9, Canada. and Donnelly Centre for Cellular and Biomolecular Research, 160 College St., Toronto, ON M5S 3E1, Canada
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28
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Tahir MN, Oschmann B, Buchholz D, Dou X, Lieberwirth I, Panthöfer M, Tremel W, Zentel R, Passerini S. Extraordinary Performance of Carbon-Coated Anatase TiO 2 as Sodium-Ion Anode. ADVANCED ENERGY MATERIALS 2016; 6:1501489. [PMID: 27134618 PMCID: PMC4845639 DOI: 10.1002/aenm.201501489] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/12/2015] [Indexed: 05/19/2023]
Abstract
The synthesis of in situ polymer-functionalized anatase TiO2 particles using an anchoring block copolymer with hydroxamate as coordinating species is reported, which yields nanoparticles (≈11 nm) in multigram scale. Thermal annealing converts the polymer brushes into a uniform and homogeneous carbon coating as proven by high resolution transmission electron microscopy and Raman spectroscopy. The strong impact of particle size as well as carbon coating on the electrochemical performance of anatase TiO2 is demonstrated. Downsizing the particles leads to higher reversible uptake/release of sodium cations per formula unit TiO2 (e.g., 0.72 eq. Na+ (11 nm) vs only 0.56 eq. Na+ (40 nm)) while the carbon coating improves rate performance. The combination of small particle size and homogeneous carbon coating allows for the excellent electrochemical performance of anatase TiO2 at high (134 mAh g-1 at 10 C (3.35 A g-1)) and low (≈227 mAh g-1 at 0.1 C) current rates, high cycling stability (full capacity retention between 2nd and 300th cycle at 1 C) and improved coulombic efficiency (≈99.8%).
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Affiliation(s)
- Muhammad Nawaz Tahir
- Institute for Inorganic and Analytical Chemistry University of Mainz Duesbergweg 10-14 55128 Mainz Germany
| | - Bernd Oschmann
- Institute for Organic Chemistry University of Mainz Duesbergweg 10-14 55128 Mainz Germany; Graduate School Materials Science in Mainz Staudinger Weg 9 55128 Mainz Germany
| | - Daniel Buchholz
- Helmholtz Institute Ulm (HIU) Electrochemistry I Helmholtzstr. 11 89081 Ulm Germany; Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
| | - Xinwei Dou
- Helmholtz Institute Ulm (HIU) Electrochemistry I Helmholtzstr. 11 89081 Ulm Germany; Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
| | - Ingo Lieberwirth
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Martin Panthöfer
- Institute for Inorganic and Analytical Chemistry University of Mainz Duesbergweg 10-14 55128 Mainz Germany
| | - Wolfgang Tremel
- Institute for Inorganic and Analytical Chemistry University of Mainz Duesbergweg 10-14 55128 Mainz Germany
| | - Rudolf Zentel
- Institute for Organic Chemistry University of Mainz Duesbergweg 10-14 55128 Mainz Germany
| | - Stefano Passerini
- Helmholtz Institute Ulm (HIU) Electrochemistry I Helmholtzstr. 11 89081 Ulm Germany; Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
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Van Schoors J, Lens C, Maes K, Michotte Y, Smolders I, Van Eeckhaut A. Reassessment of the antioxidative mixture for the challenging electrochemical determination of dopamine, noradrenaline and serotonin in microdialysis samples. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 998-999:63-71. [DOI: 10.1016/j.jchromb.2015.06.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 05/18/2015] [Accepted: 06/12/2015] [Indexed: 10/23/2022]
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Scoglio S, Benedetti Y, Benvenuti F, Battistelli S, Canestrari F, Benedetti S. Selective monoamine oxidase B inhibition by an Aphanizomenon flos-aquae extract and by its constitutive active principles phycocyanin and mycosporine-like amino acids. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2014; 21:992-997. [PMID: 24690316 DOI: 10.1016/j.phymed.2014.03.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 01/09/2014] [Accepted: 03/02/2014] [Indexed: 06/03/2023]
Abstract
Aphanizomenon flos-aquae (AFA) is a fresh water unicellular blue-green alga that has been traditionally used for over 25 years for its health-enhancing properties. Recent studies have shown the ability of a proprietary AFA extract (Klamin(®)) to improve mood, counteract anxiety, and enhance attention and learning. Aim of this study was to test the monoamine oxidase (MAO) inhibition activity of the same AFA extract and of its constituents phycocyanin (AFA-PC) and mycosporine-like aminoacids (AFA-MAAs). All compounds showed a dose-dependent selective inhibition of MAO-B activity as compared to MAO-A. The IC50 values of the AFA extract (concentration 10 mg/ml), AFA-PC and AFA-MAAs were 6.4 μl/ml, 1.33 μM and 1.98 μM, respectively, evidencing a mixed-type of inhibition for the AFA extract (Ki 0.99 μl/ml), a non-competitive inhibition for AFA-PC (Ki 1.06 μM) and a competitive inhibition for AFA-MAAs (Ki 0.585 μM). These results are important to explain the neuromodulating properties of the AFA extract Klamin(®), which is rich in phenylethylamine, a general neuromodulator, that would nevertheless rapidly destroyed by MAO-B enzymes without the inhibitory activity of the synergic active principles AFA-PC and AFA-MAAs. The present investigation thus proposes the extract as potentially relevant in clinical areas such as mood disorders and neurodegenerative diseases.
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Affiliation(s)
- Stefano Scoglio
- Centro di Ricerche Nutriterapiche, via I Maggetti 14, 61029 Urbino, Italy.
| | - Yanina Benedetti
- Centro di Ricerche Nutriterapiche, via I Maggetti 14, 61029 Urbino, Italy; Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Francesca Benvenuti
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Serafina Battistelli
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Franco Canestrari
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Serena Benedetti
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
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Schäfer A, Burstein ES, Olsson R. Bexarotene prodrugs: targeting through cleavage by NQO1 (DT-diaphorase). Bioorg Med Chem Lett 2014; 24:1944-7. [PMID: 24666648 DOI: 10.1016/j.bmcl.2014.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Revised: 02/25/2014] [Accepted: 03/01/2014] [Indexed: 11/24/2022]
Abstract
Bexarotene, a retinoid X receptor (RXR) agonist, is being tested as a potential disease modifying treatment for neurodegenerative conditions. To limit the peripheral exposure of bexarotene and release it only in the affected areas of the brain, we designed a prodrug strategy based on the enzyme NAD(P)H/quinone oxidoreductase (NQO1) that is elevated in neurodegenerative diseases. A series of indolequinones (known substrates of NQO1) was synthesized and coupled to bexarotene. Bexarotene-3-(hydroxymethyl)-5-methoxy-1,2-dimethyl-1H-indole-4,7-dione ester 7a was cleaved best by NQO1. The prodrugs are not cleaved by esterase.
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Affiliation(s)
- Anja Schäfer
- Department of Chemistry and Molecular Biology/Medicinal Chemistry, University of Gothenburg, SE-412 96 Gothenburg, Sweden
| | - Ethan S Burstein
- ACADIA Pharmaceuticals Inc., 11085 Torreyanna Road, Suite 100, San Diego, CA 92121, USA
| | - Roger Olsson
- Department of Chemistry and Molecular Biology/Medicinal Chemistry, University of Gothenburg, SE-412 96 Gothenburg, Sweden; ACADIA Pharmaceuticals Inc., 11085 Torreyanna Road, Suite 100, San Diego, CA 92121, USA; Chemical Biology & Therapeutics, Department of Experimental Medical Science, Lund University, SE-221 84 Lund, Sweden.
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Liang W, He S, Fang J. Self-assembly of J-aggregate nanotubes and their applications for sensing dopamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:805-811. [PMID: 24397785 DOI: 10.1021/la404022q] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
J-aggregates are an attractive supramolecular structure with interesting excitation properties found in the light-harvesting antenna of green sulfur bacteria. To structurally mimic the light-harvesting antenna, we synthesize J-aggregate nanotubes with a sharp and intense absorption band (J-band) by the coassembly of lithocholic acid (LCA) and 3,3'-dipropylthiadicarbocyanine iodide (DiSC3(5)) in aqueous solution. We show that the J-aggregate nanotubes can be used as a supramolecular probe for the sensitive and selective detection of dopamine (DA) in phosphate buffered saline (PBS) solution with the detection limit of ∼0.4 nM by simply observing the intensity change of the J-band due to the efficient photoinduced electron transfer from the J-aggregate nanotubes to the adsorbed DA.
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Affiliation(s)
- Weilang Liang
- Department of Materials Science and Engineering and ‡College of Optics and Photonics, University of Central Florida , Orlando, Florida 32816, United States
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Bisaglia M, Filograna R, Beltramini M, Bubacco L. Are dopamine derivatives implicated in the pathogenesis of Parkinson's disease? Ageing Res Rev 2014; 13:107-14. [PMID: 24389159 DOI: 10.1016/j.arr.2013.12.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 12/16/2013] [Accepted: 12/23/2013] [Indexed: 10/25/2022]
Abstract
Parkinson's disease (PD) is the most common motor system disorder affecting 1-2% of people over the age of sixty-five. Although PD is generally a sporadic neurological disorder, the discovery of monogenic, hereditable forms of the disease, representing 5-10% of all cases, has been very important in helping to partially delineate the molecular pathways that lead to this pathology. These mechanisms include impairment of the intracellular protein-degradation pathways, protein aggregation, mitochondria dysfunction, oxidative stress and neuroinflammation. Some of these features are also supported by post-mortem analyses. One of the main pathological hallmarks of PD is the preferential degeneration of dopaminergic neurons, which supports a direct role of dopamine itself in promoting the disorder. This review presents a comprehensive overview of the existing literature that links the aforementioned pathways to the oxidative chemistry of dopamine, ultimately leading to the formation of free radicals and reactive quinone species. We emphasize, in particular, how the reaction of dopamine-derived quinones with several cellular targets could foster the processes involved in the pathogenesis of PD and contribute to the progression of the disorder.
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Gomes BR, Siqueira-Soares RDC, dos Santos WD, Marchiosi R, Soares AR, Ferrarese-Filho O. The effects of dopamine on antioxidant enzymes activities and reactive oxygen species levels in soybean roots. PLANT SIGNALING & BEHAVIOR 2014; 9:e977704. [PMID: 25482756 PMCID: PMC4622826 DOI: 10.4161/15592324.2014.977704] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 09/02/2014] [Accepted: 09/03/2014] [Indexed: 05/05/2023]
Abstract
In the current work, we investigated the effects of dopamine, an neurotransmitter found in several plant species on antioxidant enzyme activities and ROS in soybean (Glycine max L. Merrill) roots. The effects of dopamine on SOD, CAT and POD activities, as well as H2O2, O2(•-), melanin contents and lipid peroxidation were evaluated. Three-day-old seedlings were cultivated in half-strength Hoagland nutrient solution (pH 6.0), without or with 0.1 to 1.0 mM dopamine, in a growth chamber (25°C, 12 h photoperiod, irradiance of 280 μmol m(-2) s(-1)) for 24 h. Significant increases in melanin content were observed. The levels of ROS and lipid peroxidation decreased at all concentrations of dopamine tested. The SOD activity increased significantly under the action of dopamine, while CT activity was inhibited and POD activity was unaffected. The results suggest a close relationship between a possible antioxidant activity of dopamine and melanin and activation of SOD, reducing the levels of ROS and damage on membranes of soybean roots.
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Affiliation(s)
- Bruno Ribeiro Gomes
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR, Brazil
| | | | - Wanderley Dantas dos Santos
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR, Brazil
| | - Rogério Marchiosi
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR, Brazil
| | - Anderson Ricardo Soares
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR, Brazil
| | - Osvaldo Ferrarese-Filho
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR, Brazil
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GUCHHAIT BISWAJIT, PRADHAN TUHIN, BISWAS RANJIT. Effects of acid concentration on intramolecular charge transfer reaction of 4-(azetidinyl) benzonitrile in solution. J CHEM SCI 2014. [DOI: 10.1007/s12039-013-0558-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zuo L, Hallman AH, Roberts WJ, Wagner PD, Hogan MC. Superoxide release from contracting skeletal muscle in pulmonary TNF-α overexpression mice. Am J Physiol Regul Integr Comp Physiol 2013; 306:R75-81. [PMID: 24196666 DOI: 10.1152/ajpregu.00425.2013] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Chronic obstructive pulmonary disease (COPD) often results in increased levels of tumor necrosis factor-α (TNF-α), a proinflammatory cytokine, which circulates in the blood. However, it is not clear whether pulmonary TNF-α overexpression (a COPD mimic) induces excessive reactive oxygen species (ROS) formation in skeletal muscle and thereby may contribute to the muscle impairment often seen in COPD. We hypothesized that ROS generation in contracting skeletal muscle is elevated when there is TNF-α overproduction in the lung and that this can induce muscle dysfunction. Cytochrome c (cyt c) in the perfusate was used to assay superoxide (O2(·-)) release from isolated contracting soleus muscles from transgenic mice of pulmonary TNF-α overexpression (Tg(+)) and wild-type (WT) mice. Our results showed that Tg(+) muscle released significantly higher levels of O2(·-) than WT during a period of intense contractile activity (in nmol/mg wt; 17.5 ± 2.3 vs. 4.4 ± 1.3, respectively; n = 5; P < 0.05). In addition, the soleus muscle demonstrated a significantly reduced fatigue resistance in Tg(+) mice compared with WT mice. Perfusion of the contracting soleus muscle with superoxide dismutase, which specifically scavenges O2(·-) in the perfusate, resulted in significantly less cyt c reduction, thereby indicating that the type of ROS released from the Tg(+) muscles is O2(·-). Our results demonstrate that pulmonary TNF-α overexpression leads to a greater O2(·-) release from contracting soleus muscle in Tg(+) compared with WT and that the excessive formation of O2(·-) in the contracting muscle of Tg(+) mice leads to earlier fatigue.
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Affiliation(s)
- Li Zuo
- Department of Medicine, University of California, San Diego, La Jolla, California
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Gambetta C, Natera J, Massad WA, García NA. Methyl anthranilate as generator and quencher of reactive oxygen species: A photochemical study. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Guidotti BB, Gomes BR, Siqueira-Soares RDC, Soares AR, Ferrarese-Filho O. The effects of dopamine on root growth and enzyme activity in soybean seedlings. PLANT SIGNALING & BEHAVIOR 2013; 8:e25477. [PMID: 23838960 PMCID: PMC4002588 DOI: 10.4161/psb.25477] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 06/18/2013] [Accepted: 06/20/2013] [Indexed: 05/05/2023]
Abstract
In the present study, we investigated the effects of dopamine, an allelochemical exuded from the velvetbean (Mucuna pruriens L DC. var utilis), on the growth and cell viability of soybean (Glycine max L. Merrill) roots. We analyzed the effects of dopamine on superoxide dismutase, phenylalanine ammonia-lyase and cell wall-bound peroxidase activities as well as its effects on lignin contents in the roots. Three-day-old seedlings were cultivated in half-strength Hoagland nutrient solution (pH 6.0), without or with 0.25 to 1.0 mM dopamine, in a growth chamber (25°C, 12L:12D photoperiod, irradiance of 280 μmol m(-2) s(-1)) for 24 h. In general, the length, fresh weight and dry weight of roots, cell viability, PAL and POD activities decreased, while SOD activities increased after dopamine treatment. The content of lignin was not altered. The data demonstrate the susceptibility of soybean to dopamine and reinforce the role of this catecholamine as a strong allelochemical. The results also suggest that dopamine-induced inhibition in soybean roots is not related to the production of lignin, but may be related to damage caused by reactive oxygen species.
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Affiliation(s)
- Bruno Boni Guidotti
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR Brazil
| | - Bruno Ribeiro Gomes
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR Brazil
| | | | - Anderson Ricardo Soares
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR Brazil
| | - Osvaldo Ferrarese-Filho
- Laboratory of Plant Biochemistry; Department of Biochemistry; State University of Maringá; Maringá, PR Brazil
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Ji X, Palui G, Avellini T, Na HB, Yi C, Knappenberger KL, Mattoussi H. On the pH-dependent quenching of quantum dot photoluminescence by redox active dopamine. J Am Chem Soc 2012; 134:6006-17. [PMID: 22394283 DOI: 10.1021/ja300724x] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We investigated the charge transfer interactions between luminescent quantum dots (QDs) and redox active dopamine. For this, we used pH-insensitive ZnS-overcoated CdSe QDs rendered water-compatible using poly (ethylene glycol)-appended dihydrolipoic acid (DHLA-PEG), where a fraction of the ligands was amine-terminated to allow for controlled coupling of dopamine-isothiocyanate onto the nanocrystal. Using this sample configuration, we probed the effects of changing the density of dopamine and the buffer pH on the fluorescence properties of these conjugates. Using steady-state and time-resolved fluorescence, we measured a pronounced pH-dependent photoluminescence (PL) quenching for all QD-dopamine assemblies. Several parameters affect the PL loss. First, the quenching efficiency strongly depends on the number of dopamines per QD-conjugate. Second, the quenching efficiency is substantially increased in alkaline buffers. Third, this pH-dependent PL loss can be completely eliminated when oxygen-depleted buffers are used, indicating that oxygen plays a crucial role in the redox activity of dopamine. We attribute these findings to charge transfer interactions between QDs and mainly two forms of dopamine: the reduced catechol and oxidized quinone. As the pH of the dispersions is changed from acidic to basic, oxygen-catalyzed transformation progressively reduces the dopamine potential for oxidation and shifts the equilibrium toward increased concentration of quinones. Thus, in a conjugate, a QD can simultaneously interact with quinones (electron acceptors) and catechols (electron donors), producing pH-dependent PL quenching combined with shortening of the exciton lifetime. This also alters the recombination kinetics of the electron and hole of photoexcited QDs. Transient absorption measurements that probed intraband transitions supported those findings where a simultaneous pronounced change in the electron and hole relaxation rates was measured when the pH was changed from acidic to alkaline.
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Affiliation(s)
- Xin Ji
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA
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Griesser M, Pistis V, Suzuki T, Tejera N, Pratt DA, Schneider C. Autoxidative and cyclooxygenase-2 catalyzed transformation of the dietary chemopreventive agent curcumin. J Biol Chem 2010; 286:1114-24. [PMID: 21071447 DOI: 10.1074/jbc.m110.178806] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The efficacy of the diphenol curcumin as a cancer chemopreventive agent is limited by its chemical and metabolic instability. Non-enzymatic degradation has been described to yield vanillin, ferulic acid, and feruloylmethane through cleavage of the heptadienone chain connecting the phenolic rings. Here we provide evidence for an alternative mechanism, resulting in autoxidative cyclization of the heptadienone moiety as a major pathway of degradation. Autoxidative transformation of curcumin was pH-dependent with the highest rate at pH 8 (2.2 μM/min) and associated with stoichiometric uptake of O(2). Oxidation was also catalyzed by recombinant cyclooxygenase-2 (COX-2) (50 nm; 7.5 μM/min), and the rate was increased ≈10-fold by the addition of 300 μM H(2)O(2). The COX-2 catalyzed transformation was inhibited by acetaminophen but not indomethacin, suggesting catalysis occurred by the peroxidase activity. We propose a mechanism of enzymatic or autoxidative hydrogen abstraction from a phenolic hydroxyl to give a quinone methide and a delocalized radical in the heptadienone chain that undergoes 5-exo cyclization and oxygenation. Hydration of the quinone methide (measured by the incorporation of O-18 from H(2)(18)O) and rearrangement under loss of water gives the final dioxygenated bicyclopentadione product. When curcumin was added to RAW264.7 cells, the bicyclopentadione was increased 1.8-fold in cells activated by LPS; vanillin and other putative cleavage products were negligible. Oxidation to a reactive quinone methide is the mechanistic basis of many phenolic anti-cancer drugs. It is possible, therefore, that oxidative transformation of curcumin, a prominent but previously unrecognized reaction, contributes to its cancer chemopreventive activity.
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Affiliation(s)
- Markus Griesser
- Department of Pharmacology and Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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The anti-Parkinsonian drug selegiline delays the nucleation phase of α-synuclein aggregation leading to the formation of nontoxic species. J Mol Biol 2010; 405:254-73. [PMID: 21050861 DOI: 10.1016/j.jmb.2010.10.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Revised: 08/28/2010] [Accepted: 10/16/2010] [Indexed: 11/22/2022]
Abstract
Parkinson's disease (PD) is a movement disorder characterized by the loss of dopaminergic neurons in the substantia nigra and the formation of intraneuronal inclusions called Lewy bodies, which are composed mainly of α-synuclein (α-syn). Selegiline (Sel) is a noncompetitive monoamino oxidase B inhibitor that has neuroprotective effects and has been administered to PD patients as monotherapy or in combination with l-dopa. Besides its known effect of increasing the level of dopamine (DA) by monoamino oxidase B inhibition, Sel induces other effects that contribute to its action against PD. We evaluated the effects of Sel on the in vitro aggregation of A30P and wild-type α-syn. Sel delays fibril formation by extending the lag phase of aggregation. In the presence of Sel, electron microscopy reveals amorphous heterogeneous aggregates, including large annular species, which are innocuous to a primary culture enriched in dopaminergic neurons, while their age-matched counterparts are toxic. The inhibitory effect displayed by Sel is abolished when seeds (small fibril pieces) are added to the aggregation reaction, reinforcing the hypothesis that Sel interferes with early nuclei formation and, to a lesser extent, with fibril elongation. NMR experiments indicate that Sel does not interact with monomeric α-syn. Interestingly, when added in combination with DA (which favors the formation of toxic protofibrils), Sel overrides the inhibitory effect of DA and favors fibrillation. Additionally, Sel blocks the formation of smaller toxic aggregates by perturbing DA-dependent fibril disaggregation. These effects might be beneficial for PD patients, since the sequestration of protofibrils into fibrils or the inhibition of fibril dissociation could alleviate the toxic effects of protofibrils on dopaminergic neurons. In nondopaminergic neurons, Sel might slow the fibrillation, giving rise to the formation of large nontoxic aggregates.
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Medintz IL, Stewart MH, Trammell SA, Susumu K, Delehanty JB, Mei BC, Melinger JS, Blanco-Canosa JB, Dawson PE, Mattoussi H. Quantum-dot/dopamine bioconjugates function as redox coupled assemblies for in vitro and intracellular pH sensing. NATURE MATERIALS 2010; 9:676-84. [PMID: 20651808 DOI: 10.1038/nmat2811] [Citation(s) in RCA: 244] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The use of semiconductor quantum dots (QDs) for bioimaging and sensing has progressively matured over the past decade. QDs are highly sensitive to charge-transfer processes, which can alter their optical properties. Here, we demonstrate that QD-dopamine-peptide bioconjugates can function as charge-transfer coupled pH sensors. Dopamine is normally characterized by two intrinsic redox properties: a Nernstian dependence of formal potential on pH and oxidation of hydroquinone to quinone by O(2) at basic pH. We show that the latter quinone can function as an electron acceptor quenching QD photoluminescence in a manner that depends directly on pH. We characterize the pH-dependent QD quenching using both electrochemistry and spectroscopy. QD-dopamine conjugates were also used as pH sensors that measured changes in cytoplasmic pH as cells underwent drug-induced alkalosis. A detailed mechanism describing the QD quenching processes that is consistent with dopamine's inherent redox chemistry is presented.
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Affiliation(s)
- Igor L Medintz
- Center for Bio/Molecular Science and Engineering Code 6900, US Naval Research Laboratory, Washington, District of Columbia 20375, USA.
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Gonçalves LL, Ramkissoon A, Wells PG. Prostaglandin H Synthase-1-Catalyzed Bioactivation of Neurotransmitters, Their Precursors, and Metabolites: Oxidative DNA Damage and Electron Spin Resonance Spectroscopy Studies. Chem Res Toxicol 2009; 22:842-52. [DOI: 10.1021/tx800423s] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luísa L. Gonçalves
- Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, and Department of Pharmacology and Toxicology, University of Toronto, 1 Kings’ College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Annmarie Ramkissoon
- Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, and Department of Pharmacology and Toxicology, University of Toronto, 1 Kings’ College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Peter G. Wells
- Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, and Department of Pharmacology and Toxicology, University of Toronto, 1 Kings’ College Circle, Toronto, Ontario M5S 1A8, Canada
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Zhou ZD, Lim TM. Dopamine (DA) induced irreversible proteasome inhibition via DA derived quinones. Free Radic Res 2009; 43:417-30. [PMID: 19291591 DOI: 10.1080/10715760902801533] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study demonstrated that DA and its oxidative metabolites: H2O2 and aminochrome (AM), cyclized DA quinones, could all directly inhibit proteasome activity. DA and AM, especially AM, could induce intensive and irreversible proteasome inhibition, whereas proteasome inhibition induced by H2O2 was weaker and GSH reversible. It was concluded that DA induced irreversible proteasome inhibition via DA-derived quinones, rather than through small molecular weight ROS. The AM was also more toxic than H2O2 to dopaminergic MN9D cells. Furthermore the cytotoxicity and proteasome inhibition induced by DA, AM and H2O2 could be abrogated by GSH, ascorbic acid (AA), Vitamin E, SOD (superoxidase dismutase) or CAT (catalase) with different profiles. Only GSH was potent to abrogate DA, AM or H2O2-induced cell toxicity and proteasome inhibition, as well as to reverse H2O2-induced proteosome inhibition. Therefore, therapeutic strategies to increase GSH level or to use GSH substitutes should function to control PD onset and development.
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Affiliation(s)
- Zhi Dong Zhou
- Department of Biological Science, National University of Singapore, 14 Science Drive 4, Singapore 117543
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Massad WA, Barbieri Y, Romero M, García NA. Vitamin B2-sensitized Photo-oxidation of Dopamine. Photochem Photobiol 2008; 84:1201-8. [DOI: 10.1111/j.1751-1097.2008.00320.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Dopamine and iron mediated fragmentation of galactocerebroside and cardiolipin in micelles. OPEN CHEM 2007. [DOI: 10.2478/s11532-007-0041-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractMatrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and thin-layer chromatography (TLC) have been used to study dopamine and iron mediated free-radical transformation of lipids in their hydrophilic parts. It has been shown that the action of the dopamine/Fe2+ system on galactocerebroside or cardiolipin, which are the components of mixed micelles, results in formation of ceramide or phosphatidic acid and phosphatidylhydroxyacetone, respectively. These data, when combined with results obtained using the ascorbate/Fe2+/H2O2 oxidizing system with the same substrates, demonstrate that the formation of these products proceeds via an OH-radical induced fragmentation taking place in polar moiety of the starting lipids.
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Lebedev AV, Ivanova MV, Timoshin AA, Ruuge EK. Effect of group II metal cations on catecholate oxidation. Chemphyschem 2007; 8:1863-9. [PMID: 17634998 DOI: 10.1002/cphc.200700296] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The unexpected effects of Ca(2+) on the free-radical chain reactions of dopamine, norepinephrine, isoproterenol, and pyrocatechol oxidation are studied using oxygen consumption measurements, EPR-spectroscopy, UV/VIS spectrophotometry, and by potentiometric titration. It is found that the formation of Ca(2+)-catecholate complexes is accompanied by an increase in the dissociation constants (K(ai) ) of their phenolic hydroxyls. At pH>pK(ai) and in the presence of alkaline-earth metal cations, the rate of catecholate oxidation increases (Ca(2+), Mg(2+)> Sr(2+), Ba(2+)), whereas on addition of Zn ions the rate decreases. The effects of Group II metal cations on catecholate autoxidation are concomitant with a transient increase of the EPR signal for metal-semiquinonate complexes. Therefore, the effects of Ca(2+) and other alkaline-earth metal cations on catecholate autoxidation can be defined as 1) additional deprotonation of catechol OH-groups involved in the formation of M(2+)-catecholate complexes, the latter exceeding catechols in the susceptibility to dioxygen-induced oxidation and 2) formation of relatively stable free-radical intermediates responsible for chain propagation.
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Affiliation(s)
- Alexander V Lebedev
- Department of Biochemistry, Institute of Experimental Cardiology, Cardiology Research Center, 3rdCherepkovskaya Street 15A, 121552 Moscow, Russia.
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Li HT, Lin DH, Luo XY, Zhang F, Ji LN, Du HN, Song GQ, Hu J, Zhou JW, Hu HY. Inhibition of alpha-synuclein fibrillization by dopamine analogs via reaction with the amino groups of alpha-synuclein. Implication for dopaminergic neurodegeneration. FEBS J 2005; 272:3661-72. [PMID: 16008565 DOI: 10.1111/j.1742-4658.2005.04792.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fibrillization of alpha-synuclein (alpha-Syn) is closely associated with the formation of Lewy bodies in neurons and dopamine (DA) is a potent inhibitor for the process, which is implicated in the causative pathogenesis of Parkinson's disease (PD). To elucidate any molecular mechanism that may have biological relevance, we tested the inhibitory abilities of DA and several analogs including chemically synthetic and natural polyphenols in vitro. The MS and NMR characterizations strongly demonstrate that DA and its analogs inhibit alpha-Syn fibrillization by a mechanism where the oxidation products (quinones) of DA analogs react with the amino groups of alpha-Syn chain, generating alpha-Syn-quinone adducts. It is likely that the amino groups of alpha-Syn undergo nucleophilic attack on the quinone moiety of DA analogs to form imino bonds. The covalently cross-linked alpha-Syn adducts by DA are primarily large molecular mass oligomers, while those by catechol and p-benzoquinone (or hydroquinone) are largely monomers or dimers. The DA quinoprotein retains the same cytotoxicity as the intact alpha-Syn, suggesting that the oligomeric intermediates are the major elements that are toxic to the neuronal cells. This finding implies that the reaction of alpha-Syn with DA is relevant to the selective dopaminergic loss in PD.
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Affiliation(s)
- Hong-Tao Li
- Key Laboratory of Proteomics, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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Kozlov AV, Szalay L, Umar F, Kropik K, Staniek K, Niedermüller H, Bahrami S, Nohl H. Skeletal muscles, heart, and lung are the main sources of oxygen radicals in old rats. Biochim Biophys Acta Mol Basis Dis 2005; 1740:382-9. [PMID: 15949706 DOI: 10.1016/j.bbadis.2004.11.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2004] [Revised: 09/30/2004] [Accepted: 11/09/2004] [Indexed: 11/25/2022]
Abstract
The aim of this study was to compare rat tissues with respect to their reactive oxygen and nitrogen species (RONS) generating activities as a function of age. We quantified the RONS generation in vivo in young (6 months) and in old (30 months) male Sprague-Dawley rats using the recently developed spin trap 1-hydroxy-3-carboxy-pyrrolidine, applied intravenously. This spin trap reacts with superoxide radical and peroxynitrite yielding a stable spin adduct which is detectable by means of electron paramagnetic resonance (EPR) spectroscopy in frozen tissues. In old rats RONS generation was significantly increased compared to their young counterparts in the following order: blood<skeletal muscle<lung<heart, but did not change in intestine, brain, liver, and kidney. Experiments with isolated heart mitochondria showed a significant rate of RONS generation in succinate-supplemented mitochondria from old rats while no RONS were detected in mitochondria from young rats. This study identifies heart, lung, and skeletal muscle as the tissues with increased RONS formation as a function of age.
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Affiliation(s)
- Andrey V Kozlov
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria.
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Barrier L, Barc-Pain S, Stadelmann-Ingrand S, Bestel E, Fauconneau B, Page G. Lactic acidosis progressively impairs dopamine uptake in rat striatal synaptosomes by a mechanism partially independent of the Na+/K+-ATPase dysfunction. Neurosci Lett 2004; 359:114-8. [PMID: 15050724 DOI: 10.1016/j.neulet.2004.02.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2003] [Revised: 02/05/2004] [Accepted: 02/05/2004] [Indexed: 11/20/2022]
Abstract
Previous experiments reported that incubation of rat striatal synaptosomes with lactic acid (pH 5.5) resulted in an inhibition of dopamine (DA) uptake partially mediated by free radical damage. Since the DA uptake process is highly dependent on the functionality of Na+/K+-ATPase, the present study investigated whether this inhibition of DA uptake could be related to an alteration of the Na+/K+-ATPase activity. Striatal lactic acidosis was performed by direct addition of lactic acid in the incubation medium to obtain a pH as close as possible to that observed in ischemia. Acidosis (pH 5.5) induced a progressive decline in the specific DA uptake and a decrease of Na+/K+-ATPase activity in striatal synaptosomes. However, whereas loss of Na+/K+-ATPase activity was totally prevented by Trolox, a powerful antioxidant, DA uptake remained partially inhibited. Taken together, these data suggest that acidosis, in a degree encountered during ischemia, alters the high-affinity DA uptake in part by a mechanism that does not involve a Na+/K+ pump deficiency.
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Affiliation(s)
- Laurence Barrier
- Groupe d'Etudes des Mécanismes Cellulaires de l'Ischémie (GEMCI), UPRES EA 1223, Faculté de Médecine et de Pharmacie, 34 Rue du Jardin des Plantes, BP 199, 86005 Poitiers Cedex, France.
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