Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
International Journal of Medicinal Mushrooms
IF: 1.423 5-Year IF: 1.525 SJR: 0.431 SNIP: 0.716 CiteScore™: 2.6

ISSN Print: 1521-9437
ISSN Online: 1940-4344

International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushr.v11.i1.50
pages 39-54

Role of Two Species of Medicinal Mushrooms from Genus Ganoderma P. Karst. (G. lucidum and G. tsugae; Aphyllophoromycetideae) in Selective Estrogen-Receptor Modulations

Siu Wai Chiu
Department of Biology, The Chinese University of Hong Kong, Hong Kong SAR, China
Vivien Wing-Yin Luk
Department of Biology, The Chinese University of Hong Kong, Hong Kong SAR, China
Jing Qin
Department of Biology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
Jun Gong
Department of Biology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China

ABSTRACT

Aqueous extracts were prepared from fruiting bodies artificially produced by solid-state fermentation and the vegetative mycelia produced by submerged fermentation of two strains of Ganoderma lucidum and two strains of G. tsugae (Basidiomycetes, Ganodermataceae). These aqueous extracts inhibited the proliferation of human breast cancer cells MCF-7 expressing estrogen receptor (ER) α and β in a dose-dependent response in steroid-enriched media. Yet these extracts stimulated proliferation of MCF-7 in steroid-depleted media, as first revealed in the present study. This estrogenic feature was confirmed by competitive binding to ERα and -β in vitro and upregulation of the ER-responsive gene pS2 of MCF-7 by reverse transcriptase-PCR. Although these G. lucidum and G. tsugae strains showed different estrogenic efficacies and antiproliferation capacities, such mycoestrogenic properties originated from the terpenes not polysaccharides as ER ligands. Among these 4 strains, G. lucidum extracts or terpene preparations showed higher estrogenicities. The aqueous extract of one G. tsugae strain demonstrated estrogenic properties at 0.5 mg/mL but antiproliferation causing DNA breakage detected by single cell gel electrophoresis at 1.0 mg/mL in steroid-depleted media. There was no synergistic effect on the proliferation of MCF-7 cells observed when 0.5 mg/mL G. tsugae extract was in combination with 1 nM 17β-estradiol for supplementation. Such extract upregulated the transcription of gene ERα but not ERβ of MCF-7 cells and peaked this ERα expression at 0.5 mg/mL by real-time polymerase chain reaction. Also, the pS2 expression of MCF-7 cells was in phase with its ERα expression. In steroid-enriched media, MCF-7 showed lower expression of gene pS2 at day 4, whereas treatment with G. lucidum or G. tsugae extracts could maintain this transcription level, although the cell population showed a continuous drop and higher expression of tumor suppressor gene p53 and proapoptotic gene Bax. Thus, the antiproliferation effect of G. lucidum is not via the suppression of the ER pathway. This study first proves the selective responses between mitogenic effect and antiproliferative effect on MCF-7 cells under steroid-enriched and steroid-depleted media conditions by G. lucidum and G. tsugae extracts. Whereas the mitogenic effect is via estrogen receptor modulation, the antiproliferation is mediated via multiple pathways involving the induction of apoptosis. Nevertheless, the present study supports the traditional belief in consuming species of the genus Ganoderma, especially G. lucidum and G. tsugae, for maintaining the health of the aged, who usually show decreased production of sex hormones, and for preventing diseases, that is, breast cancer.


Articles with similar content:

Activation of the AKT/FOXO3a Signaling Pathway during Breast Cancer Inhibition In Vivo and In Vitro by Amauroderma rude (Agaricomycetes)
International Journal of Medicinal Mushrooms, Vol.21, 2019, issue 12
Suwei Lei, Yi-Zhen Xie, Xiaojie Zhao, Xiaobing Yang, Honghui Pan
Comparative Cytotoxicity and Hemagglutination Activities of Crude Protein Extracts from Culinary-Medicinal Mushrooms
International Journal of Medicinal Mushrooms, Vol.12, 2010, issue 2
Renee Lay Hong Lim, Suan Li Lee, Jin Ying Leong
Inhibition of Quorum Sensing in the Opportunistic Pathogenic Bacterium Chromobacterium violaceum by an Extract from Fruiting Bodies of Lingzhi or Reishi Medicinal Mushroom, Ganoderma lucidum (W.Curt.:Fr.) P. Karst. (Higher Basidiomycetes)
International Journal of Medicinal Mushrooms, Vol.13, 2011, issue 6
Huijun Liu, Baozhen Tian, Wei Liu, Shoujiao Ning, Hu Zhu
Disruption of Actin Cytoskeleton Enhanced Cytokine Synthesis of Splenocytes Stimulated with Beta-Glucan from the Cauliflower Medicinal Mushroom, Sparassis crispa Wulf.:Fr. (Higher Basidiomycetes) in Vitro
International Journal of Medicinal Mushrooms, Vol.14, 2012, issue 3
Yoshiyuki Adachi, Noriko N. Miura, Asami Shibata, Naohito Ohno, Ken-ichi Ishibashi, Toshie H. Hida
A Polysaccharide Isolated from Mycelia of the Lion’s Mane Medicinal Mushroom Hericium erinaceus (Agaricomycetes) Induced Apoptosis in Precancerous Human Gastric Cells
International Journal of Medicinal Mushrooms, Vol.19, 2017, issue 12
Yanqiu Zhang, Yang Gao, Xulang Xiao, Mingxing Wang, Duoduo Xu, Qipin Gao