2021
DOI: 10.3390/ijms22094736
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A Pilot Study of Changes in the Level of Catecholamines and the Activity of α-2-Macroglobulin in the Tear Fluid of Patients with Parkinson’s Disease and Parkinsonian Mice

Abstract: Development of differential and early (preclinical) diagnostics of Parkinson’s disease (PD) is among the priorities in neuroscience. We searched for changes in the level of catecholamines and α-2-macroglobulin activity in the tear fluid (TF) in PD patients at an early clinical stage. It was shown that TF in patients is characterized by an increased level of noradrenaline mainly on the ipsilateral side of pronounced motor symptoms (72%, p = 0.049), a decreased level of adrenaline on both sides (ipsilateral—53%,… Show more

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Cited by 13 publications
(11 citation statements)
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References 65 publications
(121 reference statements)
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“…Recently, we have proposed a third, hybrid approach to the development of the preclinical diagnosis of PD. It is based on a search for biomarkers in untreated PD patients at an early clinical stage, and in animal models of the preclinical and early clinical stages of PD [5,20,22]. In such case, only those changes in body fluids that are characteristic of both patients and animal models are considered as biomarkers of the preclinical stage.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, we have proposed a third, hybrid approach to the development of the preclinical diagnosis of PD. It is based on a search for biomarkers in untreated PD patients at an early clinical stage, and in animal models of the preclinical and early clinical stages of PD [5,20,22]. In such case, only those changes in body fluids that are characteristic of both patients and animal models are considered as biomarkers of the preclinical stage.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, it seems justified to study the change in the profile of monoamine accumulation in tears as a potential source of PD biomarkers. Bogdanov et al (2021) [ 82 ] analyzed the change in the concentration of selected catecholamines (dopamine, noradrenaline, adrenaline), metabolites: L-DOPA (dopamine precursor) and DOPAC (dopamine degradation product). The study also analyzed the content of α-2-macroglobulin, which is a proteases inhibitor present in patients’ PD tears and involved in the pathogenesis of PD [ 82 ].…”
Section: Resultsmentioning
confidence: 99%
“…Bogdanov et al (2021) [ 82 ] analyzed the change in the concentration of selected catecholamines (dopamine, noradrenaline, adrenaline), metabolites: L-DOPA (dopamine precursor) and DOPAC (dopamine degradation product). The study also analyzed the content of α-2-macroglobulin, which is a proteases inhibitor present in patients’ PD tears and involved in the pathogenesis of PD [ 82 ]. The change in the regulation of this protein is observed in the CSF of people with PD [ 83 ].…”
Section: Resultsmentioning
confidence: 99%
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“…This is due to the fact that MPTP is converted in the body into MPP+, a toxin of catecholaminergic neurons, which causes the death of these neurons in the brain, as well as in the peripheral nervous system in animals, which is also typical for patients [ 29 ]. Our MPTP models of PD at the preclinical and clinical stages were developed 10 years ago [ 28 ] and then used to assess the stage-dependent molecular mechanisms of neurodegeneration and neuroplasticity in the nigrostriatal dopaminergic system [ 25 , 30 , 31 ], as well as the peripheral manifestations of these processes [ 32 , 33 ].…”
Section: Discussionmentioning
confidence: 99%