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These compounds have melanic, lipid, peptide, and inorganic components and are contained inside special autolysosomes. Neuromelanins can participate in neuroprotective or toxic processes occurring in Parkinson's disease according to cellular environment. Their synthesis depends on the concentration of cytosolic catechols and is a protective process since it prevents the toxic accumulation of catechols\u2010derived reactive compounds. Neuromelanins can be neuroprotective also by binding reactive\/toxic metals to produce stable and non\u2010toxic complexes. Extraneuronal neuromelanin released by dying dopamine neurons in Parkinson's disease activates microglia which generate reactive oxygen species, reactive nitrogen species, and proinflammatory molecules, thus producing still neuroinflammation and neuronal death. Synthetic neuromelanins have been prepared with melanic, protein structure, and metal content closely mimicking the natural brain pigment, and these models are also able to activate microglia. Neuromelanins have different structure, synthesis, cellular\/subcellular distribution, and role than melanins of hair, skin, and other tissues. The main common aspect between brain neuromelanin and peripheral melanin is the presence of eumelanin and\/or pheomelanin moieties in their structure.<\/jats:p>","DOI":"10.1002\/iub.2654","type":"journal-article","created":{"date-parts":[[2022,6,11]],"date-time":"2022-06-11T06:54:50Z","timestamp":1654930490000},"page":"55-65","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":69,"title":["Neuromelanins in brain aging and Parkinson's disease: synthesis, structure, neuroinflammatory, and neurodegenerative role"],"prefix":"10.1002","volume":"75","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1230-1129","authenticated-orcid":false,"given":"Fabio A.","family":"Zucca","sequence":"first","affiliation":[{"name":"Institute of Biomedical Technologies National Research Council of Italy  Segrate (Milan) 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