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Abstract
Parkinson's disease (PD) is a chronic progressive neurological disorder characterized by resting tremor, rigidity, bradykinesia, gait disturbance, and postural instability. Levodopa, the precursor to dopamine, coadministered with carbidopa or benserazide, aromatic amino acid decarboxylase inhibitors, is the most effective and widely used therapeutic agent in the treatment of PD. With continued levodopa treatment, a majority of patients develop motor complications such as dyskinesia and motor 'on-off' fluctuations, which are, in part, related to the fluctuations in plasma concentrations of levodopa. A new extended-release (ER) carbidopa-levodopa capsule product (also referred to as IPX066) was developed and approved in the US as Rytary® and in the EU as Numient®. The capsule formulation is designed to provide an initial rapid absorption of levodopa comparable to immediate-release (IR) carbidopa-levodopa, and to subsequently provide stable levodopa concentrations with reduced peak-to-trough excursions in plasma concentrations in order to reduce motor fluctuations associated with pulsatile stimulation of dopamine receptors and to minimize dyskinesia. Phase III studies of this ER carbidopa-levodopa capsule formulation in patients with PD have shown a significant reduction in 'off' time compared with IR carbidopa-levodopa and carbidopa-levodopa-entacapone. We present a review of the clinical pharmacokinetics and pharmacodynamics of this ER product of carbidopa-levodopa in healthy subjects and in patients with PD.
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Othman AA, Rosebraugh M, Chatamra K, Locke C, Dutta S. Levodopa-Carbidopa Intestinal Gel Pharmacokinetics: Lower Variability than Oral Levodopa-Carbidopa. JOURNAL OF PARKINSONS DISEASE 2018; 7:275-278. [PMID: 28211816 PMCID: PMC5438475 DOI: 10.3233/jpd-161042] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In a double-blind, double-dummy, double-titration Phase 3 trial in advanced Parkinson’s disease (PD) patients, the efficacy and safety of Levodopa-carbidopa intestinal gel (LCIG) infusion were characterized relative to immediate-release oral levodopa-carbidopa (LC-oral) treatment. We present in this report the comparative pharmacokinetic profiles of LCIG and LC-oral from this pivotal study. The results presented in this report clearly demonstrate that LCIG results in lower variability and fluctuations in levodopa and carbidopa plasma concentrations compared to LC-oral. The superior pharmacokinetic profiles with LCIG were consistent with its improved efficacy compared to LC-oral as demonstrated in this study.
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Affiliation(s)
- Ahmed A Othman
- Clinical Pharmacology and Pharmacometrics, AbbVie, North Chicago, IL, USA
| | - Matthew Rosebraugh
- Clinical Pharmacology and Pharmacometrics, AbbVie, North Chicago, IL, USA
| | - Krai Chatamra
- Former Employee of Neuroscience Development, AbbVie, North Chicago, IL, USA
| | - Charles Locke
- Clinical Pharmacology and Pharmacometrics, AbbVie, North Chicago, IL, USA
| | - Sandeep Dutta
- Former Employee of Clinical Pharmacology and Pharmacometrics, AbbVie, North Chicago, IL, USA
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Ngwuluka NC, Choonara YE, Modi G, du Toit LC, Kumar P, Ndesendo VMK, Pillay V. Design of an interpolyelectrolyte gastroretentive matrix for the site-specific zero-order delivery of levodopa in Parkinson's disease. AAPS PharmSciTech 2013; 14:605-19. [PMID: 23494468 DOI: 10.1208/s12249-013-9945-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 02/22/2013] [Indexed: 11/30/2022] Open
Abstract
This study focused on developing a gastroretentive drug delivery system employing a triple-mechanism interpolyelectrolyte complex (IPEC) matrix comprising high density, swelling, and bioadhesiveness for the enhanced site-specific zero-order delivery of levodopa in Parkinson's disease. An IPEC was synthesized and directly compressed into a levodopa-loaded matrix employing pharmaceutical technology and evaluated with respect to its physicochemical and physicomechanical properties and in vitro drug release. The IPEC-based matrix displayed superior mechanical properties in terms of matrix hardness (34-39 N/mm) and matrix resilience (44-47%) when different normality's of solvent and blending ratios were employed. Fourier transform infrared spectroscopy confirmed the formation of the IPEC. The formulations exhibited pH and density dependence with desirable gastro-adhesion with Peak Force of Adhesion ranging between 0.15 and 0.21 N/mm, densities from 1.43 to 1.54 g/cm(3) and swellability values of 177-234%. The IPEC-based gastroretentive matrix was capable of providing site-specific levodopa release with zero-order kinetics corroborated by detailed mathematical and molecular modeling studies. Overall, results from this study have shown that the IPEC-based matrix has the potential to improve the absorption and subsequent bioavailability of narrow absorption window drugs, such as levodopa with constant and sustained drug delivery.
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Junnotula V, Licea-Perez H. Development and validation of a simple and sensitive method for quantification of levodopa and carbidopa in rat and monkey plasma using derivatization and UPLC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 926:47-53. [DOI: 10.1016/j.jchromb.2013.03.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/20/2013] [Accepted: 03/04/2013] [Indexed: 10/27/2022]
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Agúndez JAG, García-Martín E, Alonso-Navarro H, Jiménez-Jiménez FJ. Anti-Parkinson's disease drugs and pharmacogenetic considerations. Expert Opin Drug Metab Toxicol 2013; 9:859-74. [PMID: 23565891 DOI: 10.1517/17425255.2013.789018] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
INTRODUCTION The development of pharmacogenetic-based clinical practice guidelines for the use of anti-Parkinson's disease drugs requires, as a pre-requisite, the identification and validation of genetic biomarkers. These biomarkers are then used as surrogate endpoints. This review analyzes potential genetic biomarkers which can be used to improve anti-Parkinson's disease therapy. AREAS COVERED The authors present an overview of current knowledge of pharmacogenetic implications of anti-Parkinson's disease drugs, including genes coding for the corresponding drug-metabolizing enzymes and drug targets. The gene/drug pairings with the strongest potential for pharmacogenetic recommendations include: CYP2C19/benztropine, COMT/levodopa and entacapone, CYP2B6/selegiline, UGT1A/entacapone, DRD2/ropinirole, pramipexole and cabergoline, and DRD3/ropinirole and pramipexole. Evidence supporting the effect of substrates, inhibitor or inducers for drug specific metabolizing enzymes in anti-Parkinson's disease drug response includes CYP1A2 in the response to ropinirole and rasagiline, and CYP3A4 in the response to bromocriptine, lisuride, pergolide and cabergoline. The authors present and discuss the current information on gene variations according to the 1000 genomes catalog and other databases with regards to anti-Parkinson's disease drugs. They also review and discuss the clinical implications of these variations. EXPERT OPINION The goal of pharmacogenomic testing for anti-Parkinson's disease drugs should be conservative and aimed at selecting determined drugs for determined patients. However, much additional research is still needed to obtain reliable pre-prescription tests.
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Affiliation(s)
- José A G Agúndez
- University of Extremadura, Department of Pharmacology, Avda. de la Universidad s/n, E-10071, Cáceres, Spain.
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Malek NM, Grosset DG. Enhancing dopamine treatments: worth the effort? Neurodegener Dis Manag 2012. [DOI: 10.2217/nmt.12.36] [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] Open
Abstract
SUMMARY Dopamine-based treatments underlie our current management of the motor symptoms of Parkinson’s disease. In this article, we look at the development of levodopa therapy, combination therapies with levodopa/dopa decarboxylase inhibitors, use of dopamine agonists, monoamine oxidase inhibitors, catechol-O-methyl transferase inhibitors and the development of nonoral delivery methods, in particular in the treatment of motor complications in later PD. There are some shortcomings of dopamine-based therapies including a limited benefit on the non-motor manifestations of Parkinson’s disease. We conclude by looking at the themes for future developments to further enhance dopamine delivery methods.
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Affiliation(s)
- Naveed M Malek
- Institute of Neurological Sciences, Southern General Hospital, Glasgow, G51 4TF, UK
| | - Donald G Grosset
- Institute of Neurological Sciences, Southern General Hospital, Glasgow, G51 4TF, UK
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Oei NYL, Rombouts SA, Soeter RP, van Gerven JM, Both S. Dopamine modulates reward system activity during subconscious processing of sexual stimuli. Neuropsychopharmacology 2012; 37:1729-37. [PMID: 22395731 PMCID: PMC3358742 DOI: 10.1038/npp.2012.19] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 02/03/2012] [Accepted: 02/07/2012] [Indexed: 12/18/2022]
Abstract
Dopaminergic medication influences conscious processing of rewarding stimuli, and is associated with impulsive-compulsive behaviors, such as hypersexuality. Previous studies have shown that subconscious subliminal presentation of sexual stimuli activates brain areas known to be part of the 'reward system'. In this study, it was hypothesized that dopamine modulates activation in key areas of the reward system, such as the nucleus accumbens, during subconscious processing of sexual stimuli. Young healthy males (n=53) were randomly assigned to two experimental groups or a control group, and were administered a dopamine antagonist (haloperidol), a dopamine agonist (levodopa), or placebo. Brain activation was assessed during a backward-masking task with subliminally presented sexual stimuli. Results showed that levodopa significantly enhanced the activation in the nucleus accumbens and dorsal anterior cingulate when subliminal sexual stimuli were shown, whereas haloperidol decreased activations in those areas. Dopamine thus enhances activations in regions thought to regulate 'wanting' in response to potentially rewarding sexual stimuli that are not consciously perceived. This running start of the reward system might explain the pull of rewards in individuals with compulsive reward-seeking behaviors such as hypersexuality and patients who receive dopaminergic medication.
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Affiliation(s)
- Nicole Y L Oei
- Leiden Institute for Brain and Cognition-LIBC, Leiden University, Leiden, The Netherlands.
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Issa YM, Hassoun MEM, Zayed AG. APPLICATION OF HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF LEVODOPA, CARBIDOPA, AND ENTACAPONE IN TABLET DOSAGE FORMS. J LIQ CHROMATOGR R T 2011. [DOI: 10.1080/10826076.2011.591024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Yousry M. Issa
- a Chemistry Department , Faculty of Science, Cairo University , Giza, Egypt
| | - Mohamed E. M. Hassoun
- b Chemistry Department , Faculty of Science, Beni Seuf University , Beni Seuf, Egypt
| | - Ashraf G. Zayed
- b Chemistry Department , Faculty of Science, Beni Seuf University , Beni Seuf, Egypt
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César IC, Byrro RMD, Santana E Silva Cardoso FF, Mundim IM, Souza Teixeira L, Gomes SA, Bonfim RR, Pianetti GA. Development and validation of a high-performance liquid chromatography-electrospray ionization-MS/MS method for the simultaneous quantitation of levodopa and carbidopa in human plasma. JOURNAL OF MASS SPECTROMETRY : JMS 2011; 46:943-948. [PMID: 21915959 DOI: 10.1002/jms.1973] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A sensitive and fast high-performance liquid chromatography-electrospray ionization-MS/MS method for the simultaneous quantitation of levodopa and carbidopa in human plasma was developed and validated. A simple protein precipitation step with perchloric acid was used for the cleanup of plasma, and methyldopa was added as an internal standard. The analyses were carried out using an ACE C(18) column (50 × 4.6 mm i.d.; 5 µm particle size) and a mobile phase consisting of 0.2% formic acid and acetonitrile (90:10). The triple-quadrupole mass spectrometer equipped with an electrospray source in positive mode was set up in the selective reaction monitoring mode to detect the ion transitions m/z 198.1 → m/z 107.0, m/z 227.2 → m/z 181.0, and m/z 212.1 → m/z 139.2 for levodopa, carbidopa, and methyldopa, respectively. The method was validated and proved to be linear, accurate, and precise over the range 50-5000 ng/mL for levodopa and 3-600 ng/mL for carbidopa. The proposed method was successfully applied in a pharmacokinetic study with a levodopa/carbidopa tablet formulation in healthy volunteers.
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Affiliation(s)
- Isabela Costa César
- Instituto de Ciências Farmacêuticas, Alameda Coronel Eugênio Jardim 53, 74175-100, Goiânia, GO, Brazil.
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Ngwuluka N, Pillay V, Du Toit LC, Ndesendo V, Choonara Y, Modi G, Naidoo D. Levodopa delivery systems: advancements in delivery of the gold standard. Expert Opin Drug Deliv 2010; 7:203-24. [DOI: 10.1517/17425240903483166] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Mwatseteza J, Torto N. Amperometric Detection of 3-(3,4-Dihydroxyphenyl)-l-alanine (l-Dopa) in Raw and Cooked Mucuna Bean Seeds Employing Micro-HPLC. Chromatographia 2007. [DOI: 10.1365/s10337-007-0397-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Mennickent S, Nail M, Vega M, de Diego M. Quantitative determination of L-DOPA in tablets by high performance thin layer chromatography. J Sep Sci 2007; 30:1893-8. [PMID: 17638351 DOI: 10.1002/jssc.200600533] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A densitometric high performance thin-layer chromatographic (HPTLC) method was developed and validated for quantitative analysis of L-DOPA in tablets. Chromatographic separation was achieved on precoated silica gel F 254 HPTLC plates using a mixture of acetone-chloroform-n-butanol-acetic acid glacial-water (60:40:40:40:35 v/v/v/v/v) as mobile phase. Quantitative analysis was carried out at a wavelength of 497 nm. The method was linear between 100 and 500 ng/microL, with a correlation coefficient of 0.999. The intra-assay variation was between 0.26 and 0.65% and the interassay was between 0.52 and 2.04%. The detection limit was 1.12 ng/microL, and the quantification limit was 3.29 ng/microL. The accuracy ranged from 100.40 to 101.09%, with a CV not higher than 1.40%. The method was successfully applied to quantify L-DOPA in real pharmaceutical samples, including the comparison with HPLC measurements. The method was fast, specific, with a good precision, and accurate for the quantitative determination of L-DOPA in tablets.
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Affiliation(s)
- Sigrid Mennickent
- Department of Pharmacy, Faculty of Pharmacy, University of Concepción, Concepción, Chile.
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Leu H, Lin M. A LiMn2O4 Based Electrochemical Scheme for Selective Measurement of Dopamine. ELECTROANAL 2006. [DOI: 10.1002/elan.200503404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Both S, Everaerd W, Laan E, Gooren L. Effect of a single dose of levodopa on sexual response in men and women. Neuropsychopharmacology 2005; 30:173-83. [PMID: 15470373 DOI: 10.1038/sj.npp.1300580] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
From animal research, there is ample evidence for a facilitating effect of dopamine on sexual behavior. In humans, little experimental research has been conducted on the inter-relation between dopamine and sexual response, even less so in women than in men. We investigated the effect of levodopa (100 mg) on sexual response in men and women following a double-blind, placebo-controlled crossover design. Genital and subjective sexual responses were measured as well as somatic motor system activity by means of Achilles tendon (T) reflex modulation. Genital and subjective sexual arousal were not affected by levodopa. However, the drug increased T reflex magnitude in response to sexual stimulation in men, but not in women. These results support the view that dopamine is involved in the energetic aspects of appetitive sexual behavior in men. The observed gender difference in the effect of levodopa is discussed in the perspective of possible dopamine-steroid interaction.
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Affiliation(s)
- Stephanie Both
- Department of Clinical Psychology, Faculty of Social and Behavioral Sciences, University of Amsterdam, Amsterdam, The Netherlands.
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Guzmán A, Agüí L, Pedrero M, Yáñez-Sedeño P, Pingarrón JM. Flow injection and HPLC determination of furosemide using pulsed amperometric detection at microelectrodes. J Pharm Biomed Anal 2003; 33:923-33. [PMID: 14656583 DOI: 10.1016/s0731-7085(03)00422-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The flow-injection and HPLC determination of the diuretic drug furosemide using pulsed amperometric detection (PAD) at cylindrical carbon fibre microelectrodes (CFMEs) is reported. Experimental conditions such as pH (6.5) and buffer concentration (0.05 mol l(-1) HPO4(2-)/H2PO4(-)) were optimized using square-wave voltammetry (SWV). Repetitive flow-injection amperometric measurements at +1.25 V for furosemide showed a continuous decrease in the peak current, probably as a consequence of the microelectrode surface fouling. However, a suitable amperometric detection of furosemide was achieved using a PAD program consisting of a two-step potential waveform with alternating anodic and cathodic polarization. The anodic (detection) potential was +1.25 V (time of application 0.1 s), and the cathodic (cleaning) potential was -0.20 V (t=0.2 s). A linear calibration graph was obtained for furosemide in the 5.0 x 10(-7)-1.0 x 10(-4) mol l(-1) concentration range, with a limit of detection of 1.7 x 10(-7) mol l(-1). HPLC-PAD at carbon fibre microelectrodes was used for the determination of furosemide in the presence of several thiouracil drugs and oxytetracycline (OTC). The mobile phase selected was a 25:75 acetonitrile:5.0 x 10(-3) mol l(-1) NaH2PO4 (pH 5.0) mixture. A linear calibration graph was obtained for furosemide in the 1-100 microM range, with a limit of detection of 0.55 microM. The usefulness of this method for the determination of furosemide in real samples was evaluated by performing the analysis of commercial milk samples spiked with furosemide at a concentration level of 4.5 x 10(-7) mol l(-1) (150 ng ml(-1)), as well as with other thiouracil drugs and OTC. A mean recovery of 95+/-5% furosemide was obtained.
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Affiliation(s)
- Alicia Guzmán
- Department of Analytical Chemistry, Faculty of Chemistry, University Complutense of Madrid, 28040 Madrid, Spain
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Abstract
The fast on-chip determination of a range of compounds of relevance in the study and treatment of neurological disorders is demonstrated. These include dopamine and its metabolites methoxytyramine, homovanillic acid, noradrenaline, adrenaline, normetanephrine, and metanephrine, its artificial precursors DOPA and tyrosine; and the related compounds DOPS and CDOPA. Two runs are needed for the determination of these compounds. The enantiomers of adrenaline, noradrenaline, and dopamine can be separated in a buffer containing the novel combination of a cyclodextrin and a dendrimer. The isomers of homovanillic acid, DOPA, CDOPA, methoxytyramine, metanephrine, and normetanephrine, which were found to interact more weakly with cyclodextrins, could be separated in approximately 3 min with a buffer containing a cyclodextrin and a crown ether. To our knowledge, this is the first report of a fast chiral separation of such a complex mixture on an electrophoresis chip. Detection was carried out amperometrically; derivatization of the analytes is not necessary.
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Affiliation(s)
- Maria A Schwarz
- Department of Chemistry, The University of Basel, Spitalstrasse 51, 4004 Basel, Switzerland
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Lawrence NS, Beckett EL, Davis J, Compton RG. Advances in the voltammetric analysis of small biologically relevant compounds. Anal Biochem 2002; 303:1-16. [PMID: 11906145 DOI: 10.1006/abio.2002.5584] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The problems associated with attempting to apply voltammetric techniques to the analysis of biologically relevant organics within complex media are identified and, through reviewing the very recent literature (1999-mid-2001), possible solutions are described. The boundaries of the search were limited to research targeted at the resolution of specific problems, associated with quantitative determinations. Various strategies have emerged to counter problems of poor sensitivity and selectivity and these have been summarized and critically appraised. Where possible, the characteristics of each approach have been distilled into a table format to ease comparison. Emphasis has been placed on the collation of information that will improve the intrinsic electrode response and as such should be of value to those interested in pursuing electroanalytical methodologies regardless of context.
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Affiliation(s)
- Nathan S Lawrence
- Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
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