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It shows stimulatory effects to dopaminergic neurons by increasing the expression of tyrosine hydroxylase and its transcription factors in pre-existing dopa decarboxylase immunoreactive neurons. Furthermore, 9-methyl-β-carboline has emerged as a substance with the rare property of a protective and regenerative/restorative potential for dopaminergic neurons by inducing gene expression of several neurotrophic factors and decreasing apoptotic cell signals. It reduces protein levels of α-synuclein and inhibits monoamine oxidase A and B. Finally, 9-methyl-β-carboline acts on multiple targets in the inflammatory cascade by inhibiting the proliferation of microglia, by decreasing chemotactic cytokines and by creating an anti-inflammatory environment in the CNS. 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</a></li><li><a title="Opens new window" class="rightslink" href="/servlet/linkout?type=rightslink&url=rpt%3Dy%26pageCount%3D16%26issn%3D1473-7175%26endPage%3D860%26startPage%3D845%26contentID%3Dern.11.1%26publication%3Dern%26author%3DWitold%2BPolanski%252C%2BHeinz%2BReichmann%252C%2BGabriele%2BGille%26title%3DStimulation%252C%2Bprotection%2Band%2Bregeneration%2Bof%2Bdopaminergic%2Bneurons%2Bby%2B9-methyl-%25CE%25B2-carboline%253A%2Ba%2Bnew%2Banti-Parkinson%2Bdrug%253F%26orderBeanReset%3Dtrue%26publisherName%3DIHC%26imprint%3DExpert%2BReviews%26volumeNum%3D11%26permissions%3Dtrue%26issueNum%3D6%26publicationDate%3D06%252F01%252F2011">Reprints</a></li><li><a title="Opens new window" class="rightslink" href="/servlet/linkout?type=rightslink&url=rpt%3Dn%26pageCount%3D16%26issn%3D1473-7175%26endPage%3D860%26startPage%3D845%26contentID%3Dern.11.1%26publication%3Dern%26author%3DWitold%2BPolanski%252C%2BHeinz%2BReichmann%252C%2BGabriele%2BGille%26title%3DStimulation%252C%2Bprotection%2Band%2Bregeneration%2Bof%2Bdopaminergic%2Bneurons%2Bby%2B9-methyl-%25CE%25B2-carboline%253A%2Ba%2Bnew%2Banti-Parkinson%2Bdrug%253F%26orderBeanReset%3Dtrue%26publisherName%3DIHC%26imprint%3DExpert%2BReviews%26volumeNum%3D11%26permissions%3Dtrue%26issueNum%3D6%26publicationDate%3D06%252F01%252F2011">Permissions</a></li></ul></div><div class="artAuthors"><a class="entryAuthor" href="/action/doSearch?Contrib=Witold+Polanski%E2%80%A01%2C+">Witold Polanski<a class="ref" href="/action/showPopup?citid=citart1&id=c1&doi=10.1586/ern.11.1"><sup>†</sup></a><a class="ref" href="/action/showPopup?citid=citart1&id=a1&doi=10.1586/ern.11.1"><sup>1</sup></a><a class="ref" href="/action/showPopup?citid=citart1&id=a2&doi=10.1586/ern.11.1"></a>, </a><a class="entryAuthor" href="/action/doSearch?Contrib=Heinz+Reichmann1+and+">Heinz Reichmann<a class="ref" href="/action/showPopup?citid=citart1&id=a1&doi=10.1586/ern.11.1"><sup>1</sup></a><a class="ref" href="/action/showPopup?citid=citart1&id=a1&doi=10.1586/ern.11.1"></a> and </a><a class="entryAuthor" href="/action/doSearch?Contrib=Gabriele+Gille1">Gabriele Gille<a class="ref" href="/action/showPopup?citid=citart1&id=a1&doi=10.1586/ern.11.1"><sup>1</sup></a><a class="ref" href="/action/showPopup?citid=citart1&id=a1&doi=10.1586/ern.11.1"></a></a><div class="fulltext"><sup>1</sup>Department of Neurology, Technical University of Dresden, Fetscherstr. 74, 01307 Dresden, Germany </div><div class="fulltext"><a class="email" href="mailto:witold.polanski@gmx.de">witold.polanski@gmx.de</a></div></div><div class="NLM_author-notes"><div class="NLM_corresp">† <i>Author for correspondence</i></div></div><p class="fulltext"></p><br clear="all"/><div class="abstractSection"><p class="first last">β-carbolines are potential endogenous and exogenous neurotoxins that may contribute to the pathogenesis of Parkinson’s disease (PD). 9-methyl-β-carboline exhibits multimodal effects that could be beneficial in the treatment of PD. It shows stimulatory effects to dopaminergic neurons by increasing the expression of tyrosine hydroxylase and its transcription factors in pre-existing dopa decarboxylase immunoreactive neurons. Furthermore, 9-methyl-β-carboline has emerged as a substance with the rare property of a protective and regenerative/restorative potential for dopaminergic neurons by inducing gene expression of several neurotrophic factors and decreasing apoptotic cell signals. It reduces protein levels of α-synuclein and inhibits monoamine oxidase A and B. Finally, 9-methyl-β-carboline acts on multiple targets in the inflammatory cascade by inhibiting the proliferation of microglia, by decreasing chemotactic cytokines and by creating an anti-inflammatory environment in the CNS. This article summarizes our current knowledge of 9-methyl-carboline and discusses its potential role as a new drug for the treatment of PD.</p></div><div class="keywords"><h3 class="section_heading"> Keywords </h3><a href="/action/doSearch?Keyword=9-methyl-%CE%B2-carboline">9-methyl-β-carboline</a>, <a href="/action/doSearch?Keyword=anti-inflammation">anti-inflammation</a>, <a href="/action/doSearch?Keyword=carbolines">carbolines</a>, <a href="/action/doSearch?Keyword=dopaminergic+neurons">dopaminergic neurons</a>, <a href="/action/doSearch?Keyword=neurite+outgrowth">neurite outgrowth</a>, <a href="/action/doSearch?Keyword=neuroprotection">neuroprotection</a>, <a href="/action/doSearch?Keyword=neuroregeneration">neuroregeneration</a>, <a href="/action/doSearch?Keyword=neurostimulation">neurostimulation</a>, <a href="/action/doSearch?Keyword=neurotrophic+factors">neurotrophic factors</a>, <a href="/action/doSearch?Keyword=Parkinson%E2%80%99s+disease">Parkinson’s disease</a></div><!-- /abstract content --><!-- fulltext content --><!-- /fulltext content --><div class="footer_div"><ul class="footer_list"><li><a href="/doi/full/10.1586/ern.11.1"> HTML </a></li><li><a class="pdflink" target="_blank" title="Opens new window" href="/doi/pdf/10.1586/ern.11.1"> PDF (1001 KB) </a></li><li><a class="pdflink" target="_blank" title="Opens new window" href="/doi/pdfplus/10.1586/ern.11.1"> PDF Plus (1002 KB) </a> - <a href="/page/userhelp/pdf" class="what_is_pdf">What is PDF Plus?</a></li></ul></div> <br /> <br /> <span id="hide"><a href="/doi/pdf/10.1046/9999-9999.99999"><!-- Spider trap link --></a></span> </div> <div class="aside"> <!-- placeholder id=null, description=Left Sidebar - Societies --> <!-- placeholder id=null, description=Left Sidebar - Quick Links --> <!-- placeholder id=null, description=Left Sidebar - Trial --><div class="block"> <a href="/action/clickThrough?id=1818&url=%2Faction%2FshowAlertSettings&loc=%2Fdoi%2Fabs%2F10.1586%2Fern.11.1&pubId=41325401"> <!--h2>Sign up for eAlerts</h2--> <img src="/sda/1818/ihc-site-icons-120x90-sign-up-ealerts.jpg" alt="Sign up for eAlerts" title="Sign up to receive eAlerts here... »" border="0"/> </a> </div> <div class="block"> <a href="/action/clickThrough?id=1818&url=http%3A%2F%2Fcontact.informahealthcare.com%2Fsesame.php%3F&loc=%2Fdoi%2Fabs%2F10.1586%2Fern.11.1&pubId=41325401" target="_blank"> <!--h2>Request a call back</h2--> <img src="/sda/1818/ihc-site-icons-120x90-request-call-back.jpg" alt="Request a call back" title="Want us to get in touch? 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