Mao XW, Green LM, Gridley DS.
Department of Radiation Medicine (Radiobiology Program), Loma Linda University and Medical Center, Loma Linda, Calif. 92354, USA. email@example.com
Long-term control of high-grade brain tumors is rarely achieved with current therapeutic regimens. The major goal of this study was to determine whether polysaccharopeptide (PSP), a crude polysaccharide peptide extract derived from Coriolus versicolor, a fungus, could enhance the effects of radiation against glioma cells in culture and in xenografted tumors in vivo. PSP significantly augmented radiation-induced damage to C6 rat glioma cells in vitro. Nude mice injected subcutaneously with the C6 cells were treated with PSP (injected intraperitoneally at 2 mg/injection) and radiation (2 Gy/fraction, 8 Gy in total) using three different time-dose protocols. Tumor volumes were consistently smaller in all treated groups compared to the non-treated tumor-bearing controls except in one group which received PSP prior to tumor implantation. The administration of radiation alone resulted in the slowest tumor progression, whereas PSP alone had no effect. Furthermore, PSP in combination with radiation treatment did not increase radiation efficacy. Natural killer cell, lymphocyte and granulocyte counts in blood and spleen were significantly higher in PSP-treated animals, demonstrating that PSP has protective effects on immunological function. Collectively, these results warrant further investigation to determine if PSP can be effectively utilized to upregulate immune responsiveness in case of neoplasia and other diseases in which immunosuppression is a prominent feature.
Copyright 2001 S. Karger AG, Basel
PMID: 11574781 [PubMed – indexed for MEDLINE]
Chu KK, Ho SS, Chow AH.
School of Pharmacy, Faculty of Medicine, Chinese University of Hong Kong, Shatin, NT.
Coriolus versicolor (CV) is a medicinal mushroom widely prescribed for the prophylaxis and treatment of cancer and infection in China. In recent years, it has been extensively demonstrated both preclinically and clinically that aqueous extracts obtained from CV display a wide array of biological activities, including stimulatory effects on different immune cells and inhibition of cancer growth. The growing popularity of aqueous CV extracts as an adjunct medical modality to conventional cancer therapies has generated substantial commercial interest in developing these extracts into consistent and efficacious oral proprietary products. While very limited information is available on the physical, chemical, and pharmacodynamic properties of the active principles present in these extracts, there has been sufficient scientific evidence to support the feasibility of developing at least some of these constituents into an evidence-based immunodulatory agent. In this article, the background, traditional usage, pharmacological activities, clinical effects, adverse reactions, active constituents, and regulatory aspects of CV are reviewed. Presented also in this review are the current uses and administration, potential drug interactions, and contraindication of aqueous extracts prepared from CV.
PMID: 12211223 [PubMed – indexed for MEDLINE]
Iimura Y, Tatsumi K.
We isolated and analysed two genomic DNAs that encode the heat-shock protein Hsp30 from Coriolus versicolor. The amino acid sequences substitute only three amino acid substitutions. The promoter regions contain the consensus heat-shock element, a xenobiotic-response element, a stress-response element, and a metal-response element. The levels of mRNAs for Hsp30 increased markedly after exposure of C. versicolor to pentachlorophenol and levels were higher than those after heat shock.
PMID: 12224644 [PubMed – indexed for MEDLINE]Free Article
Ichinose H, Wariishi H, Tanaka H.
Faculty of Agriculture, Kyushu University, Fukuoka, Japan.
A cDNA encoding cytochrome P450 oxidoreductase (CPR) from the lignin-degrading basidiomycete Coriolus versicolor was identified using RT-PCR. The full-length cDNA consisted of 2,484 nucleotides with a poly(A) tail, and contained an open reading frame. The G+C content of the cDNA isolated was 60%. A deduced protein contained 730 amino acid residues with a calculated molecular weight of 80.7 kDa. The conserved amino acid residues involved in functional domains such as FAD-, FMN-, and NADPH-binding domains, were all found in the deduced protein. A phylogenetic analysis demonstrated that C. versicolor CPR is significantly similar to CPR of the basidiomycete Phanerochaete chrysosporium and that they share the same major branch in the fungal cluster. A recombinant CPR protein was expressed using a pET/ Escherichia coli system. The recombinant CPR protein migrated at 81 kDa on SDS polyacrylamide gel electrophoresis. It exhibited an NADPH-dependent cytochrome c reducing activity.
PMID: 12226721 [PubMed – indexed for MEDLINE]
Mau JL, Lin HC, Chen CC.
Department of Food Science, National Chung-Hsing University, 250 Kuokuang Road, Taichung 402, Taiwan, Republic of China. firstname.lastname@example.org
Three species of medicinal mushrooms are commercially available in Taiwan, namely, Ganoderma lucidum (Ling-chih), Ganoderma tsugae (Sung-shan-ling-chih), and Coriolus versicolor (Yun-chih). Methanolic extracts were prepared from these medicinal mushrooms and their antioxidant properties studied. At 0.6 mg/mL, G. lucidum, G. lucidum antler, and G. tsugae showed an excellent antioxidant activity (2.30-6.41% of lipid peroxidation), whereas C. versicolor showed only 58.56%. At 4 mg/mL, reducing powers were in the order G. tsugae (2.38) approximately G. lucidum antler (2.28) > G. lucidum (1.62) > C. versicolor (0.79). At 0.64 mg/mL, scavenging effects on the 1,1-diphenyl-2-picrylhydrazyl radical were 67.6-74.4% for Ganoderma and 24.6% for C. versicolor. The scavenging effect of methanolic extracts from G. lucidum and G. lucidum antler on hydroxyl radical was the highest (51.2 and 52.6%) at 16 mg/mL, respectively. At 2.4 mg/mL, chelating effects on ferrous ion were in the order G. lucidum antler (67.7%) > G. lucidum (55.5%) > G. tsugae (44.8%) > C. versicolor (13.2%). Total phenols were the major naturally occurring antioxidant components found in methanolic extracts from medicinal mushrooms. Overall, G. lucidum and G. tsugae were higher in antioxidant activity, reducing power, scavenging and chelating abilities, and total phenol content.
PMID: 12358482 [PubMed – indexed for MEDLINE]
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