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Article

Transthyretin Amyloid Fibril Disrupting Activities of Extracts and Fractions from Juglans mandshurica Maxim. var. cordiformis (Makino) Kitam.

1
Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
2
Program for Leading Graduate Schools, Health Life Science: Interdisciplinary and Glocal Oriented (HIGO) Program, Kumamoto University, Kumamoto 862-0973, Japan
3
Department of Medicinal Botany, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
4
Useful and Unique Natural Products for Drug Discovery and Development (UpRoD), Program for Building Regional Innovation Ecosystems at Kumamoto University, Kumamoto 862-0973, Japan
5
Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
*
Authors to whom correspondence should be addressed.
Both authors contributed equally.
Molecules 2019, 24(3), 500; https://doi.org/10.3390/molecules24030500
Received: 21 December 2018 / Revised: 25 January 2019 / Accepted: 29 January 2019 / Published: 30 January 2019
(This article belongs to the Section Natural Products Chemistry)
Transthyretin-related amyloidosis is a slowly progressive disorder caused by deposition of insoluble amyloid plaques formed by fibrillization of mutant or defective transthyretin (TTR) monomers that leads to neurodegeneration and organ failure. Thus, any compound exhibiting TTR amyloid formation inhibitory activity or TTR amyloid fibril disrupting activity might be a potential candidate for the development of therapies for these disorders. Our aim in this study was the evaluation of the TTR amyloid fibril disrupting potential of extracts of leaves and immature fruits of two Juglans plants, i.e., Juglans mandshurica var. sachalinensis and Juglans mandshurica var. cordiformis. The TTR amyloid fibril disrupting activity was measured by Thioflavin-T (ThT) assay and PROTEOSTAT® Protein aggregation assay methods. A fifty percent acetone extract of the fruits of Juglans mandshurica var. cordiformis showed strong amyloid fibril disrupting activity, and was further fractionated using different solvents. Ethyl acetate and n-butanol fractions showed significant activity in both assays. Syringic acid was isolated and identified as main compound in both of these fractions; however, it did not show any activity. Furthermore, some of the previously reported compounds from Juglans plants including naphthoquinone derivatives and phenolic compounds were evaluated to identify the potential bioactive compounds. Among them, juglone, a naphthoquinone derivative showed promising activity. However, juglone also showed strong cytotoxicity in HEK293 cells. Thus, future studies should focus on the isolation and identification of naphthoquinone derivatives or other compounds from Juglans plan ts with potent bioactivity and low cytotoxicity. View Full-Text
Keywords: transthyretin-related amyloidosis; transthyretin protein (TTR); Juglans mandshurica var. sachalinensis; Juglans mandshurica var. cordiformis; naphthoquinone; juglone transthyretin-related amyloidosis; transthyretin protein (TTR); Juglans mandshurica var. sachalinensis; Juglans mandshurica var. cordiformis; naphthoquinone; juglone
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MDPI and ACS Style

Chaudhary, N.; Sasaki, R.; Shuto, T.; Watanabe, M.; Kawahara, T.; Suico, M.A.; Yokoyama, T.; Mizuguchi, M.; Kai, H.; Devkota, H.P. Transthyretin Amyloid Fibril Disrupting Activities of Extracts and Fractions from Juglans mandshurica Maxim. var. cordiformis (Makino) Kitam. Molecules 2019, 24, 500. https://doi.org/10.3390/molecules24030500

AMA Style

Chaudhary N, Sasaki R, Shuto T, Watanabe M, Kawahara T, Suico MA, Yokoyama T, Mizuguchi M, Kai H, Devkota HP. Transthyretin Amyloid Fibril Disrupting Activities of Extracts and Fractions from Juglans mandshurica Maxim. var. cordiformis (Makino) Kitam. Molecules. 2019; 24(3):500. https://doi.org/10.3390/molecules24030500

Chicago/Turabian Style

Chaudhary, Niraj, Ryoko Sasaki, Tsuyoshi Shuto, Masato Watanabe, Teppei Kawahara, Mary A. Suico, Takeshi Yokoyama, Mineyuki Mizuguchi, Hirofumi Kai, and Hari P. Devkota. 2019. "Transthyretin Amyloid Fibril Disrupting Activities of Extracts and Fractions from Juglans mandshurica Maxim. var. cordiformis (Makino) Kitam." Molecules 24, no. 3: 500. https://doi.org/10.3390/molecules24030500

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