Open Access

ARTICLE

Three New Hydroxytetradecenals from Amomum tsao-ko with Protein Tyrosine Phosphatase 1B and Glycogen Phosphorylase Inhibitory Activity

by Xiaolu Qin^1,3, Xinyu Li^1,3, Yi Yang², Mei Huang², Shengli Wu¹, Pianchou Gongpan¹, Lianzhang Wu², Juncai He², Changan Geng^1,3,*

1 State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China
2 Nujiang Green Spice Industry Research Institute, Lushui, 673100, China
3 University of Chinese Academy of Sciences, Beijing, 100049, China

* Corresponding Author: Changan Geng. Email:

Phyton-International Journal of Experimental Botany 2024, 93(5), 875-883. https://doi.org/10.32604/phyton.2024.048192

Received 30 November 2023; Accepted 27 March 2024; Issue published 28 May 2024

Abstract

The fruits of Amomum tsao-ko (Cao-Guo) were documented in Chinese Pharmacopoeia for the treatment of abdominal pain, vomiting, and plague. In our previous study, a series of diarylheptanes and flavonoids with α-glucosidase and protein tyrosine phosphatase 1B (PTP1B) inhibitory activity have been reported from the middle-polarity part of A. tsao-ko, whereas the antidiabetic potency of the low-polarity constituents is still unclear. In this study, three new hydroxytetradecenals, (2E, 4E, 8Z, 11Z)-6R-hydroxytetradeca-2,4,8,11-tetraenal (1), (2E, 4E, 8Z)-6R-hydroxytetradeca-2,4,8-trienal (2) and (2E, 4E)-6R-hydroxytetradeca-2,4-dienal (3) were obtained from the volatile oils of A. tsao-ko. The structures of compounds 1–3 were determined using spectroscopic data involving 1D and 2D nuclear magnetic resonance (NMR), high-resolution mass spectra (HRMS), and specific rotation ([α]). Their hypoglycemic activity was evaluated against glycogen phosphorylase (GPa) and PTP1B. Compounds 1 and 2 displayed moderate activity against PTP1B with inhibition rates of 33.8%−50.3% at 100 and 200 µM. Moreover, compound 1 exhibited an obvious inhibitory effect on GPa (IC = 31.7 µM), whereas compound 2 was inactive. This study demonstrates hydroxytetradecenals as the characteristic components of A. tsao-ko with therapeutic potential in diabetes.

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Keywords

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Supplementary Material

Supplementary Material File

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