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Manganese-stimulated redox cycling of dopamine derivatives: Implications for manganism. 2022

Praneet Kaur Marwah, and Gijong Paik, and Christopher J Issa, and Christopher C Jemison, and Muhammad B Qureshi, and Tareq M Hanna, and Eduardo Palomino, and Krishna Rao Maddipati, and David Njus
Department of Biological Sciences, Wayne State University, Detroit, MI 48202, USA.

Manganism, the condition caused by chronic exposure to high levels of manganese, selectively targets the dopamine-rich basal ganglia causing a movement disorder with symptoms similar to Parkinson's disease. While the basis for this specific targeting is unknown, we hypothesize that it may involve complexation of Mn by dopamine derivatives. At micromolar concentrations, MnCl2 accelerates the two-equivalent redox cycling of a dopamine-derived benzothiazine (dopathiazine) by an order of magnitude. In the process, O2 is reduced to superoxide and hydrogen peroxide. This effect is unique to Mn and is not shared by Fe, Cu, Zn, Co, Ca or Mg. Notably, the effect of Mn requires the presence of inorganic phosphate, suggesting that phosphate may stabilize a Mn/catecholate complex, which reacts readily with O2. This or similar endogenous dopamine derivatives may exacerbate Mn-dependent oxidative stress accounting for the neurological selectivity of manganism.

UI MeSH Term Description Entries
D008345 Manganese A trace element with atomic symbol Mn, atomic number 25, and atomic weight 54.94. It is concentrated in cell mitochondria, mostly in the pituitary gland, liver, pancreas, kidney, and bone, influences the synthesis of mucopolysaccharides, stimulates hepatic synthesis of cholesterol and fatty acids, and is a cofactor in many enzymes, including arginase and alkaline phosphatase in the liver. (From AMA Drug Evaluations Annual 1992, p2035)
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D010300 Parkinson Disease A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75) Idiopathic Parkinson Disease,Lewy Body Parkinson Disease,Paralysis Agitans,Primary Parkinsonism,Idiopathic Parkinson's Disease,Lewy Body Parkinson's Disease,Parkinson Disease, Idiopathic,Parkinson's Disease,Parkinson's Disease, Idiopathic,Parkinson's Disease, Lewy Body,Parkinsonism, Primary
D004298 Dopamine One of the catecholamine NEUROTRANSMITTERS in the brain. It is derived from TYROSINE and is the precursor to NOREPINEPHRINE and EPINEPHRINE. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. A family of receptors (RECEPTORS, DOPAMINE) mediate its action. Hydroxytyramine,3,4-Dihydroxyphenethylamine,4-(2-Aminoethyl)-1,2-benzenediol,Dopamine Hydrochloride,Intropin,3,4 Dihydroxyphenethylamine,Hydrochloride, Dopamine
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D020149 Manganese Poisoning Manganese poisoning is associated with chronic inhalation of manganese particles by individuals who work with manganese ore. Clinical features include CONFUSION; HALLUCINATIONS; and an extrapyramidal syndrome (PARKINSON DISEASE, SECONDARY) that includes rigidity; DYSTONIA; retropulsion; and TREMOR. (Adams, Principles of Neurology, 6th ed, p1213) Nervous System Diseases, Manganese-Induced,Nervous System Poisoning, Manganese,Neurotoxicity Syndrome, Manganese,Poisoning, Manganese,Manganese Neurotoxicity Syndrome,Manganese Neurotoxicity Syndromes,Nervous System Diseases, Manganese Induced,Neurotoxicity Syndromes, Manganese,Syndrome, Manganese Neurotoxicity,Syndromes, Manganese Neurotoxicity

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