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Cited by 22Cholinesterase and Neurodegenerative DiseasesPhytochemistry and Biological ActivitiesMedicinal Plants and Neuroprotection

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Isoquinoline Alkaloid Contents in Macleaya cordata Extracts and Their Acetylcholinesterase and Butyrylcholinesterase Inhibition

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Tuzimski, Tomasz, Petruczynik, Anna, Szultka-Młyńska, Małgorzata, Sugajski, Mateusz, Buszewski, Bogusław·2022·Molecules

Abstract

An important strategy for treating neurodegenerative disorders is to maintain the levels of acetylcholine in the synaptic cleft by blocking the cholinesterases. Searching for new effective compounds with inhibited acetylcholinesterase and butyrylcholinesterase activity is one of the most significant challenges of the modern scientific research. The aim of this study was the optimization of the condition for cholinesterase activity determination by high-performance liquid chromatography coupled with diode array detector (HPLC-DAD) in terms of concentrations of enzymatic reaction mixture components, temperature of incubation, and incubation time. In vitro investigation of acetylcholinesterase and butyrylcholinesterase activity inhibition by some isoquinoline alkaloids and extracts obtained from the aerial part and roots of Macleaya cordata collected in May, July, and September. Acetylcholinesterase and butyrylcholinesterase activity inhibition of the extracts obtained from the plant had not been tested previously. The application of the HPLC method allowed eliminating absorption of interfering components, for example, alkaloids such as sanguinarine and berberine. The HPLC method was successfully applied for the evaluation of the acetylcholinesterase inhibitory activity in samples such as plant extracts, especially those containing colored components adsorbing at the same wavelength as the adsorption wavelength of 5-thio-2-nitro-benzoic acid, which is the product of the reaction between thiocholine (product of the hydrolysis of acetyl/butyrylthiocholine reaction) with Ellman’s reagent. Moreover, liquid chromatography coupled with a triple quadrupole mass spectrometer (LC–QqQ–ESI–MS/MS) analysis allowed evaluating the identification of relevant bioactive compounds in the obtained plant extracts. The investigated alkaloids, especially sanguinarine and chelerythrine, and all the Macleaya cordata extracts, especially the extract obtained from the aerial part collected in May, exhibited very high cholinesterase activity inhibition. HPLC-DAD was also applied for the kinetics study of the most active alkaloids sanguinarine and chelerythrine. Our investigations demonstrated that these plant extracts can be recommended for further in vivo experiments to confirm their cholinesterase inhibition activity.

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Crossref · 10.3390/molecules27113606

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Figures

Figure 1 (A) HPLC-DAD chromatogram obtained for a mixture of alkaloid standards, (B) HPLC-DAD chromatogram obtained for the extract from the Macleaya cordata aerial part collected in May, (C) HPLC-DAD chromatogram obtained for the extract from the Macleaya cordata root collected in May. Chlr: chelerythrine; Pr: protopine; S: Ssnguinarine. The acquisition wavelength was set at 240 nm.
Figure 1 (A) HPLC-DAD chromatogram obtained for a mixture of alkaloid standards, (B) HPLC-DAD chromatogram obtained for the extract from the Macleaya cordata aerial part collected in May, (C) HPLC-DAD chromatogram obtained for the extract from the Macleaya cordata root collected in May. Chlr: chelerythrine; Pr: protopine; S: Ssnguinarine. The acquisition wavelength was set at 240 nm.CC BY · PubMed Central
Figure 2 Representative full-scan MS spectra obtained with the use of ESI–Q-TOF–MS/MS for chelerythrine from the Macleaya cordata’s extracts: (A) aerial part collected in May, (B) root collected in May, (C) aerial part collected in July, (D) root collected in July, as well as representative product ion MS/MS spectra obtained with the use of ESI-Q-TOF-MS/MS for chelerythrine (E), protopine (f), and sanguinarine (G) from the Macleaya cordata extracts.
Figure 2 Representative full-scan MS spectra obtained with the use of ESI–Q-TOF–MS/MS for chelerythrine from the Macleaya cordata’s extracts: (A) aerial part collected in May, (B) root collected in May, (C) aerial part collected in July, (D) root collected in July, as well as representative product ion MS/MS spectra obtained with the use of ESI-Q-TOF-MS/MS for chelerythrine (E), protopine (f), and sanguinarine (G) from the Macleaya cordata extracts.CC BY · PubMed Central
Figure 3 (A) Dependence of concentration of cholinesterases on the peak area. Error bars represent standard errors. (B) Dependence of ACTI and BCTI concentrations in the reaction with cholinesterases on the peak area. Error bars represent standard errors. (C) Dependence of the DTNB concentration in reaction with cholinesterases on the peak area. Error bars represent standard errors. (D) Dependence of the temperature of incubation in reaction with cholinesterases on the peak area. Error bars represent standard errors. (E) Dependence of the incubation time in reaction with acetylcholinesterases on the peak area. Error bars represent standard errors.
Figure 3 (A) Dependence of concentration of cholinesterases on the peak area. Error bars represent standard errors. (B) Dependence of ACTI and BCTI concentrations in the reaction with cholinesterases on the peak area. Error bars represent standard errors. (C) Dependence of the DTNB concentration in reaction with cholinesterases on the peak area. Error bars represent standard errors. (D) Dependence of the temperature of incubation in reaction with cholinesterases on the peak area. Error bars represent standard errors. (E) Dependence of the incubation time in reaction with acetylcholinesterases on the peak area. Error bars represent standard errors.CC BY · PubMed Central
Figure 4 Correlation between the sum of chelerythrine and sanguinarine contents and butyrylcholinesterase activity inhibition as IC50 of the investigated plant extracts.
Figure 4 Correlation between the sum of chelerythrine and sanguinarine contents and butyrylcholinesterase activity inhibition as IC50 of the investigated plant extracts.CC BY · PubMed Central
Figure 5 (A) Lineweaver–Bulk plot of acetylcholinesterase activity over a range of substrate concentration for chelerythrine, (B) determination of inhibition constants (Ki) by plotting the slope of the primary Lineweaver–Burk plot vs. chelerythrine concentration.
Figure 5 (A) Lineweaver–Bulk plot of acetylcholinesterase activity over a range of substrate concentration for chelerythrine, (B) determination of inhibition constants (Ki) by plotting the slope of the primary Lineweaver–Burk plot vs. chelerythrine concentration.CC BY · PubMed Central
Figure 6 (A) Lineweaver–Bulk plot of acetylcholinesterase activity over a range of substrate concentrations for sanguinarine, (B) determination of inhibition constants (Ki) by plotting the slope of the primary Lineweaver–Burk plot vs. sanguinarine concentration.
Figure 6 (A) Lineweaver–Bulk plot of acetylcholinesterase activity over a range of substrate concentrations for sanguinarine, (B) determination of inhibition constants (Ki) by plotting the slope of the primary Lineweaver–Burk plot vs. sanguinarine concentration.CC BY · PubMed Central
Figure 7 Interactions between AChE and ligands: (A) chelerythrine, (B) protopine, (C) sanguinarine.
Figure 7 Interactions between AChE and ligands: (A) chelerythrine, (B) protopine, (C) sanguinarine.CC BY · PubMed Central
Figure 8 Interactions between BChE and ligands: (A) chelerythrine, (B) protopine, (C) sanguinarine.
Figure 8 Interactions between BChE and ligands: (A) chelerythrine, (B) protopine, (C) sanguinarine.CC BY · PubMed Central

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Metadata

Authors
Tuzimski, T., Petruczynik, A., Szultka-Młyńska, M., Sugajski, M., & Buszewski, B.
Affiliations
  • Medical University of Lublin (PL)
  • Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100 Torun, Poland
  • Nicolaus Copernicus University (PL)
Corresponding author
  • Tuzimski, Tomasz
  • Petruczynik, Anna
Venue
Molecules
Publisher
MDPI AG
Published
2022-06-03
Volume
27
Issue
11
Pages
3606
ISSN
1420-3049 (ISSN-L)
OpenAlex
W4281674146
Cited by
21
References
41
Citations by year
2026: 2 · 2025: 7 · 2024: 5 · 2023: 6 · 2022: 1
FWCI
2.84
Type
journal article
Language
en
Open access
Locations
  • Molecules (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Pharmacology (medical) › Cholinesterase and Neurodegenerative Diseases
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Phytochemistry and Biological Activities
  • Health Sciences › Medicine › Complementary and alternative medicine › Medicinal Plants and Neuroprotection
Keywords
Macleaya cordata, isoquinoline alkaloids, acetylcholinesterase inhibition, butyrylcholinesterase inhibition, sanguinarine, chelerythrine, Ellman's reagent, neurodegenerative diseases, plant extracts, aerial parts, roots
MeSH terms
Acetylcholinesterase, Alkaloids, Antineoplastic Agents, Butyrylcholinesterase, Cholinesterase Inhibitors, Isoquinolines, Plant Extracts, Papaveraceae, Tandem Mass Spectrometry

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