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Altered secondary s...
Altered secondary structure of Dynorphin A associates with loss of opioid signalling and NMDA-mediated excitotoxicity in SCA23
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- Smeets, Cleo J. L. M. (author)
- Univ Groningen, Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands.
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- Zmorzynska, Justyna (author)
- Univ Groningen, Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands.
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- Melo, Manuel N. (author)
- Univ Groningen, Groningen Biomol Sci & Biotechnol Inst, Ctr Life Sci, Groningen, Netherlands.
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- Stargardt, Anita (author)
- Acad Med Ctr, Dept Cell Biol & Histol, Amsterdam, Netherlands.
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- Dooley, Colette (author)
- Torrey Pines Inst Mol Studies, Port St Lucie, FL USA.
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- Bakalkin, Georgy (author)
- Uppsala universitet,Institutionen för farmaceutisk biovetenskap
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- McLaughlin, Jay (author)
- Univ Florida, Dept Pharmacodynam, Gainesville, FL 32610 USA.
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- Sinke, Richard J. (author)
- Univ Groningen, Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands.
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Marrink, Siewert-Jan (author)
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- Reits, Eric (author)
- Acad Med Ctr, Dept Cell Biol & Histol, Amsterdam, Netherlands.
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- Verbeek, Dineke S. (author)
- Univ Groningen, Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands.
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Univ Groningen, Univ Med Ctr Groningen, Dept Genet, Groningen, Netherlands Univ Groningen, Groningen Biomol Sci & Biotechnol Inst, Ctr Life Sci, Groningen, Netherlands. (creator_code:org_t)
- 2016-06-03
- 2016
- English.
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In: Human Molecular Genetics. - : Oxford University Press (OUP). - 0964-6906 .- 1460-2083. ; 25:13, s. 2728-2737
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https://doi.org/10.1...
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Abstract
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- Spinocerebellar ataxia type 23 (SCA23) is caused by missense mutations in prodynorphin, encoding the precursor protein for the opioid neuropeptides alpha-neoendorphin, Dynorphin (Dyn) A and Dyn B, leading to neurotoxic elevated mutant Dyn A levels. Dyn A acts on opioid receptors to reduce pain in the spinal cord, but its cerebellar function remains largely unknown. Increased concentration of or prolonged exposure to Dyn A is neurotoxic and these deleterious effects are very likely caused by an N-methyl-D-aspartate-mediated non-opioidmechanism as Dyn A peptides were shown to bind NMDA receptors and potentiate their glutamate-evoked currents. In the present study, we investigated the cellular mechanisms underlying SCA23-mutant Dyn A neurotoxicity. We show that SCA23 mutations in the Dyn A-coding region disrupted peptide secondary structure leading to a loss of the N-terminal alpha-helix associated with decreased kappa-opioid receptor affinity. Additionally, the altered secondary structure led to increased peptide stability of R6W and R9C Dyn A, as these peptides showed marked degradation resistance, which coincided with decreased peptide solubility. Notably, L5S Dyn A displayed increased degradation and no aggregation. R6W and wt Dyn A peptides were most toxic to primary cerebellar neurons. For R6W Dyn A, this is likely because of a switch from opioid to NMDA-receptor signalling, while for wt Dyn A, this switch was not observed. We propose that the pathology of SCA23 results from converging mechanisms of loss of opioid-mediated neuroprotection and NMDA-mediated excitotoxicity.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medicinal Chemistry (hsv//eng)
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Smeets, Cleo J. ...
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Zmorzynska, Just ...
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Melo, Manuel N.
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Stargardt, Anita
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Dooley, Colette
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Bakalkin, Georgy
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show more...
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McLaughlin, Jay
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Sinke, Richard J ...
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Marrink, Siewert ...
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Reits, Eric
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Verbeek, Dineke ...
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Basic Medicine
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and Medicinal Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Biochemistry and ...
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Human Molecular ...
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Uppsala University