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Planta Med 2020; 86(13/14): 976-982
DOI: 10.1055/a-1091-8831
Biological and Pharmacological Activity
Original Papers

Trichothecenes from an Endophytic Fungus Alternaria sp. sb23

Ying Gao
School of Pharmacy, Tongji Medical College of Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, Peopleʼs Republic of China
,
Jia Zhou
School of Pharmacy, Tongji Medical College of Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, Peopleʼs Republic of China
,
Hanli Ruan
School of Pharmacy, Tongji Medical College of Huazhong University of Science and Technology, Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Wuhan, Peopleʼs Republic of China
› Author AffiliationsSupported by: National Natural Science Foundation of China 31770380, 21572073, and 31270394
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Abstract

Three new (alterchothecenes A – C, 1 –3) and 3 known (4 –6) trichothecenes, along with 9 known compounds (7 –15), were isolated from the culture of Alternaria sp. sb23, an endophytic fungus separated from the root of Schisandra sphenanthera Rehd. et Wils. Their structures were elucidated by spectroscopic analyses, and the absolute configurations of 1–3 were determined through comparison of the experimental electronic circular dichroism (ECD) spectra and optical rotations with similar analogues. In vitro cytotoxicity tests of compounds 1–6 against human HT-29 colon carcinoma and human MCF-7 breast cancer cell lines indicated that 4–6 exhibited significant cytotoxic effects, with IC50 values ranging from 0.89 to 9.38 µM. And the potential of compounds 1–6 as tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) sensitizers in HT-29 cells was evaluated. The results revealed that combination treatment of TRAIL with compounds 1–6 synergistically decreased cell viability compared with the sole treatment with those compounds.

Key words

Alternaria sp. - endophytic fungus - trichothecenes - cytotoxic effects - TRAIL sensitizer

Supporting Information

    Supporting information, consisting of numerous tables and graphs relating to this article, is available online.

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Publication History

Received: 07 October 2019

Accepted after revision: 04 January 2020

Article published online:
04 February 2020

© 2020. Thieme. All rights reserved.

Georg Thieme Verlag KG
Stuttgart · New York

 

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