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Existence and characterization of Salsolinol synthase in neuronal cells and rat brain

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Abstract

Salsolinol (1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline), the endogenous dopamine-derived catechol isoquinolines whose structure is similar with MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine), may be a possible candidate of dopaminergic neurotoxins to elicit Parkinson’s disease (PD). Catechol isoquinolines can selectively target dopaminergic neurons, leading to dopaminergic neuronal death. However, the formation and nosogenesis of these toxins remains unclear. Salsolinol synthase is a novel enzyme which condensate dopamine and acetaldehyde to salsolinol. It is the first key enzyme in the metabolic pathway of catechol isoquinolines which directly affects salsolinol and its derivative metabolism in vivo. It is also one kind of Pictet-Spenglerase, which has been little studied and need more characterization. PC12 cells and rat brains were performed to illustrate the existence of salsolinol synthase in our study. The results indicate that salsolinol synthase is a low molecular weight protein, showing enhanced activity with increase in dopamine concentration. It is suggested that salsolinol synthase is sensitive to strong acid and stable to high-temperature. In this research, existence of salsolinol synthase was confirmed in vivo, and also provided some new evidences to elucidate the endogenous catechol isoquinoline neurotoxin substances involved in the pathogenesis of PD.

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Authors and Affiliations

  1. School of Life Science & Technology, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing, 100081, P. R. China

    X. C. Chen, Y. Chen, G. S. Wu, J. Q. Lu, J. Iqbal, H. Qing & Y. L. Deng

  2. College of Life Sciences and Bioengineering, Beijing University of Technology, Beijing Key Laboratory of Environment and Viral Oncology, Beijing, 100124, Russia

    X. C. Chen

  3. 5 South Zhongguancun Street, Haidian District, Beijing, 100081, P. R. China

    Y. L. Deng

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  1. X. C. Chen
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  2. Y. Chen
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  3. G. S. Wu
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  4. J. Q. Lu
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  5. J. Iqbal
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Correspondence to Y. L. Deng.

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Chen, X.C., Chen, Y., Wu, G.S. et al. Existence and characterization of Salsolinol synthase in neuronal cells and rat brain. Neurochem. J. 7, 192–197 (2013). https://doi.org/10.1134/S1819712413030045

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  • DOI: https://doi.org/10.1134/S1819712413030045

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