Discovery of a Biocontrol Strain Trichaptum laricinum: Its Metabolites and Antifungal Activity against Pathogenic Fungus Colletotrichum anthrisci.

Finding safe and environmentally friendly fungicides is one of the important strategies in modern pesticide research and development. In this work, the antipathogenic effects of the fungus Trichaptum laricinum against the anthracnose pathogen Colletotrichum anthrisci were studied. The EtOAc extract of T. laricinum showed remarkable antifungal activity against C. anthrisci with an inhibition rate of 50% at 256 µg/mL. Bioguided isolation of the cultural broth of T. laricinum produced four new drimane sesquiterpenes, trichalarins A-D (1-4), and six other metabolites (5-10). Their structures were established by extensive spectroscopic methods, quantum chemical calculations, and single-crystal X-ray diffraction. All compounds exhibited antifungal activity against C. anthrisci with minimum inhibitory concentrations (MICs) of 8-64 µg/mL in vitro. Further in vivo assay suggested that compounds 2, 6, and 9 could significantly inhibit C. anthrisci growth in avocado fruit with inhibition rates close to 80% at the concentration of 256 µg/mL, while compounds 2 and 6 had an inhibition rate over 90% at the concentration of 512 µg/mL. The EtOAc extract of T. laricinum had no inhibitory effect on Pinus massoniana seed germination and growth at the concentration of 2 mg/mL, showing good environmental friendliness. Thus, the fungus T. laricinum could be considered as an ideal biocontrol strain, and its metabolites provided a diverse material basis for the antibiotic agents.

Phellintremulins A-C, antinociceptive sesquiterpenoids from the medicinal fungus Phellinus tremulae.

Phellintremulin A (1), a rearranged sesquiterpenoid with an unprecedented bicyclic backbone, and two previously unreported illudane-type sesquiterpenoids, namely phellintremulin B (2) and phellintremulin C (3), together with two known analogues (±)‒4 and (±)‒5, were isolated from cultures of the medicinal fungus Phellinus tremulae. Their structures and absolute configurations were established by means of spectroscopic data and HRESIMS analyses, as well as ECD and NMR calculations. A plausible biogenesis for 1 was discussed. The electrophysiological experiments showed that phellintremulins (A‒C) can inhibit Nav current in DRG neuron cells at 10 µM, with percentage inhibitions of 23.2%, 49.3%, and 31.7%, respectively. The antinociceptive activities of phellintremulins (A‒C) were evaluated via the acetic acid-induced writhing test in mice at a dose of 3 mg/kg. They showed significant antinociceptive effects with percentages of inhibition of 43.8%, 54.4%, and 50.6%, respectively, and phellintremulin B and C expressed more potent analgesic effect than lidocaine.

Steccherins A-D, chamigrane-type sesquiterpenes from the fungus Steccherinum ochraceum with selective inhibition on B lymphocyte proliferation.

Four previously undescribed chamigrane sesquiterpenes, namely steccherins A-D, have been isolated from the fungus Steccherinum ochraceum. Their structures were elucidated by extensive spectroscopic analysis, as well as computational methods and single crystal X-ray diffraction. Steccherins A and B possess previously undescribed backbones which might be derived from normal chamigrane sesquiterpenes, especially that steccherin A possesses a spiro[5.6]dodecane carbon skeleton via a ring-rearrangement. Steccherins A, C, and D showed immunosuppressive activity with IC50 values ranging from 6.2 to 37.8 µM. The data suggested that these chamigrane sesquiterpenes have potential selective inhibition on LPS-induced B lymphocyte proliferation.

Renal Amyloidosis Secondary to ANCA-Associated Vasculitis: A Case Report.

Renal amyloidosis secondary to anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis is extremely rare. Here, we reported a 77-year-old woman with ANCA-associated vasculitis. Renal biopsy with Masson trichrome staining showed pauci-immune crescentic glomerulonephritis, and electron microscopy showed amyloid deposition in the mesangial area. Immunofluorescence revealed kappa light chain and lambda light chain negative. Bone marrow biopsy revealed no clonal plasma cell. Finally, she was diagnosed as ANCA-associated vasculitis with secondary renal amyloid A amyloidosis.

Oblongolides from endophytic fungus Phoma bellidis Neerg. harbored in Tricyrtis maculata (D. Don) J.F.Macbr.

Five previously undescribed oblongolides, namely phomaones A-E, along with four known compounds, were isolated from the endophytic fungus Phoma bellidis Neerg.. Their structures and absolute configurations were determined by extensive experimental spectroscopic methods as well as single crystal X-ray diffractions, ECD calculations and GIAO 13C NMR calculations. Phomaone A represent the first example of oblongolides with glycol directly linked by two C-C bonds, and its biosynthetic pathway were proposed. The cytotoxicity of obtained compounds was evaluated against human cancer cell lines MCF-7, DU145, and SW480. All compounds except phomaone A showed the cytotoxicity against MCF-7 with IC50 value ranging from 12.45 to 49.84 µM.

Renal Amyloidosis Secondary to ANCA-Associated Vasculitis: A Case Report / 中国医学科学杂志(英文版)

Renal amyloidosis secondary to anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis is extremely rare. Here, we reported a 77-year-old woman with ANCA-associated vasculitis. Renal biopsy with Masson trichrome staining showed pauci-immune crescentic glomerulonephritis, and electron microscopy showed amyloid deposition in the mesangial area. Immunofluorescence revealed kappa light chain and lambda light chain negative. Bone marrow biopsy revealed no clonal plasma cell. Finally, she was diagnosed as ANCA-associated vasculitis with secondary renal amyloid A amyloidosis.

Pardinumones A-D: Antibacterial Polyketide-Amino Acid Derivatives from the Mushroom Tricholoma pardinum.

Four polyketide-amino acid derivatives, pardinumones A-D (1-4), were isolated from the wild mushroom Tricholoma pardinum. Their structures together with absolute configurations were characterized by means of spectroscopic data analyses, as well as calculated electronic circular dichroism (ECD) and NMR with sorted training set (STS) protocol analysis. Compounds 1-4 exhibited antibacterial activity against Staphylococcus aureus, Staphylococcus epidermidis, and Escherichia coli with MIC values in the range of 6.25-50 µg/mL.

Psathyrellins A-E, Antibacterial Guanacastane Diterpenoids from Mushroom Psathyrella candolleana.

Five previously undescribed guanacastane diterpenoids, namely psathyrellins A-E (1-5), were obtained from cultures of the mushroom Psathyrella candolleana. Their structures with absolute configurations were elucidated by extensive spectroscopic methods. Compounds 1-3 showed antibacterial activity against four strains with MIC values in a range of 16-128 µg/mL.

Structure and cytotoxicity of trichothecenes produced by the potato-associated fungus Trichothecium crotocinigenum.

Seven previously undescribed trichothecenes, named trichothecrotocins M-S (1-7), along with five known compounds, were isolated from rice cultures of the potato-associated fungus Trichothecium crotocinigenum. Their structures and absolute configurations were determined through spectroscopic methods, single-crystal X-ray diffraction, and quantum chemistry calculations on ECD. Compound 1 possesses a rare 6,11-epoxy moiety in the trichothecene family. Compound 6 exhibited strong cytotoxic activity against MCF-7 cancer cell lines with an IC50 value of 2.34 ± 0.45 µM. It promoted apoptosis induction in MCF-7 cells. Moreover, cell cycle analysis showed cell cycle arrest caused by compound 6 at the G2/M phase which resulted to cell proliferation inhibition and pro-apoptotic activity. Further quantitative real-time PCR (qRT-PCR) analysis confirmed that the G2/M arrest was accompanied by upregulation of p21 and down regulation of cyclins B1 in 6-treated MCF-7 cells.

Chemical constituents and their biological activities from the mushroom Pyropolyporus fomentarius.

The chemical constituents and their biological activities of the mushroom Pyropolyporus fomentarius were investigated in this study. Two previously undescribed pentacyclic lupane-type triterpenes, 3-formyloxybetulin and 3-formyloxybetulinic acid, two rare degraded ergosterols, pyropolincisterols A and B, along with ten known triterpenoids and four known ergosterols were isolated from the fruiting bodies of P. fomentarius. Their chemical structures were determined using a combination of spectroscopic analysis. Nine compounds exhibited certain cytotoxicities to human cancer cell lines, while polyporenic acid showed significant cytotoxicities to SMMC-7721 and A-549 with IC50 values less than 10 µM. Four compounds showed inhibitory activities against nitric oxide (NO) production in LPS-activated RAW264.7 macrophages with IC50 values of 36.3, 25.1, 21.4, and 34.2 µM, respectively. The results of this assessment suggested that the lanostane triterpenoids and ergosterols in fruiting bodies of P. fomentarius played key roles in its folk usages.

Indole alkaloids from Ophiorrhiza cantoniensis with immunosuppressive activity.

Three new indole alkaloids, ophiorrhines C-D (1-3), together with one known analogue, have been isolated from the plant of Ophiorrhiza cantoniensis Hace. The structures of the new alkaloids with the absolute configurations were elucidated by means of spectroscopic methods, electronic circular dichroism (ECD) and calculated nuclear magnetic resonance (NMR) with DP4+ analysis. Compounds 1 and 2 exhibited certain activity to Con-A induced T cell proliferation, and 1 exhibited good inhibition on LPS-induced B cell proliferation with an IC50 value of 8.7 µM.

Trichothecrotocins D-L, Antifungal Agents from a Potato-Associated Trichothecium crotocinigenum.

Seven new merosesquiterpenoids, trichothecrotocins D-J (1-7), two new trichothecene sesquiterpenoids, trichothecrotocins K (12) and L (13), and six known compounds (8-11, 14, and 15), were isolated from a potato-associated fungus, Trichothecium crotocinigenum. Compounds 5 and 6 were racemates which were further separated as pure enantiomers. Structures together with absolute configurations were established by extensive spectroscopic analysis, as well as quantum chemistry calculations on ECD and optical rotations. Compounds 1-4 are rare meroterpenoids featuring a seco-phenyl group, while 1 and 2 possessed a novel 6-6/5 fused ring system. Compounds 1-4, 8, 11, and 12 showed antifungal activity against four plant pathogens with MIC values of 8-128 µg/mL. It is suggested that the meroterpenoids produced by T. crotocinigenum may play an important role in the antifungal property of the fungus, thereby protecting the host plant, i.e., potato.

Chemical constituents and their cytotoxicities from mushroom Tricholoma imbricatum.

Two undescribed triterpenes, tricholimbrins A and B, three undescribed steroids, tricholimbrins C‒E, one undescribed 4-chromanone derivative, along with 27 known compounds were isolated from fruiting bodies of the mushroom Tricholoma imbricatum. Tricholimbrins A and B are two polycyclic triterpenoids with a carbon degradation, while tricholimbrin C is a ring-rearranged steroid containing an aromatic moiety that might be derived from an ergosterol. Isocyathisterol, 3ß,15α-dihydroxyl-(22E,24R)-ergosta-5,8(14),22-trien-7-one, demethylincisterol A3, and volemolide showed cytotoxicities to six human cancer cell lines. 3ß-Hydroxyl-(22E,24R)-ergosta-5,8,22-trien-7,15-dione and 3ß-hydroxyl-(22E,24R)-ergosta-5,8,22-trien-7-one showed preferable cytotoxicities against HL-60 while chaxine C and volemolide showed preferable cytotoxicities against A-549, with IC50 values less than 10 µM.

Depsidones and diaryl ethers from potato endophytic fungus Boeremia exigua.

Three depsidones boremexins A-C (1-3), two diaryl ethers boremexins D (4) and E (5), together with four known compounds were obtained from cultures of potato endophytic fungus Boeremia exigua. Their structures with absolute configurations were established by extensive spectroscopic methods and electronic circular dichroism (ECD) calculations. Compounds 1-4, 6, and 9 displayed anti-inflammatory properties on nitric oxide production in LPS-induced RAW264.7 macrophages with an IC50 range of 19.4-34.4 µM. Compounds 2 and 5 exhibited cytotoxicities to human breast cancer cell line (MCF-7) with IC50 values of 33.1 and 4.0 µM, respectively.

Monoterpenoid indole alkaloids from the bark of Melodinus henryi.

Four new alkaloids, melodinines W1-W4 (1-4), together with twenty one known alkaloids (5-25) were isolated from Melodinus henryi. The structures with absolute configurations were elucidated by extensive MS and NMR spectroscopic methods, as well as the single crystal X-ray diffraction and ECD calculations. All compounds were evaluated for their cytotoxicities to five human cancer cell lines. Many compounds showed certain cytotoxicities to five human cancer cell lines with an IC50 range of 1.4-29.4 µM.

Anti-inflammatory lupane triterpenoids from Menyanthes trifoliata.

A new lupane triterpenoid, 23-O-trans-feruloylcylicodiscic acid (1), as well as four known analogues (2‒5), was isolated from the EtOAc fraction of Menyanthes trefoliata. The structure of compound 1 was elucidated on the basis of extensive spectroscopic analysis, including 2D NMR data. The structures of the known compounds were established by comparison of their spectroscopic data with that in the literature. Compounds 1, 2, and 4 exhibited certain anti-NO production activities.

Piperidine alkaloids and xanthone from the roots of Caulophyllum robustum Maxim.

Two undescribed piperidine racemates, (±)-caulophines A and B (1 and 2), a new N-containing xanthone derivative (3), together with six known piperidines, were isolated from the roots of Caulophyllum robustum Maxim. Their structures were determined by extensive spectroscopic techniques. Compounds 3 and 7 exhibited weak cytotoxicities against human palace cancer hela cell line with inhibitory rates of 32.2% and 39.7%, respectively, at the concentration of 40 µM.

Trichothecrotocins A-C, Antiphytopathogenic Agents from Potato Endophytic Fungus Trichothecium crotocinigenum.

Two trichothecene sesquiterpenoids, trichothecrotocins A (1) and B (2), and a merosesquiterpenoid racemate, (±)-trichothecrotocin C (3), were obtained from potato endophytic fungus Trichothecium crotocinigenum by bioguided isolation. Their structures were elucidated by extensive spectroscopic methods, electronic circular dichroism calculations, and single-crystal X-ray diffraction. Compounds 1 and 2 are trichothecenes possessing new ring systems. Compound 3 possesses a novel 6/6-5/5/5 fused ring system. Compounds 1-3 showed antiphytopathogenic activities with MIC values of 8-128 µg/mL.

Antroalbocin A, an Antibacterial Sesquiterpenoid from Higher Fungus Antrodiella albocinnamomea.

Antroalbocin A (1), a sesquiterpenoid possessing a bridged tricyclic system, was isolated from cultures of the higher fungus Antrodiella albocinnamomea (Basidiomycota). The structure with the absolute configuration was determined by extensive spectroscopic methods and single-crystal X-ray diffraction. A plausible biosynthetic pathway for 1 was proposed. Compound 1 was found to inhibit Staphylococcus aureus with an MIC value of 169 µM.

Comparison of TPMT and NUDT15 polymorphisms in Chinese patients with inflammatory bowel disease.

AIM: To observe gene polymorphisms of TPMT and NUDT15, and compare their predictive value for azathioprine (AZA)-induced leukopenia in inflammatory bowel disease (IBD). METHODS: This study enrolled 219 patients diagnosed with IBD in Xiangya Hospital, Central South University, Changsha, China from February 2016 to November 2017. Peripheral blood of all patients was collected to detect their genotypes of TPMT and NUDT15 by pyrosequencing at the Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, Xiangya Hospital. Eighty patients were treated with AZA according to the disease condition. During the first month, patients who received AZA underwent routine blood tests and liver function tests once a week. The endpoint of the study was leukopenia induced by AZA. By analyzing patient characteristics, genotypes and leukopenia induced by drug use, we found the risk factors associated with AZA-induced leukopenia. RESULTS: There were 219 patients with IBD (160 men and 59 women), including 39 who were confirmed with ulcerative colitis (UC), 176 with Crohn's disease (CD) and 4 with undetermined IBD (UIBD). There were 44 patients (20.1%) with mutant genotype of NUDT15 (C/T); among them, 16 received AZA, and 8 (50%) developed leukopenia. There were 175 patients (79.7%) with wild genotype of NUDT15 (C/C); among them, 64 received AZA, and 11 (17.2%) developed leukopenia. A significant difference was found between NUDT15 C/T and its wild-type C/C (P = 0.004). There were only 3 patients with TPMT mutant genotype of A/G (1.4%) who participated in the research, and 1 of them was treated with AZA and developed leukopenia. The remaining 216 patients (98.6%) were found to bear the wild genotype of TPMT (A/A); among them, 79 patients received AZA, and 18 (22.8%) developed leukopenia, and there was no significant difference from those with A/G (P = 0.071). The frequency of TPMT mutation was 1.4%, and NUDT15 mutation rate was significantly higher and reached 20.1% (P = 0.000). Therefore, NUDT15 gene polymorphism was obviously a better biomarker than TPMT gene polymorphism in the prediction of AZA-induced leukopenia. CONCLUSION: Mutation rate of NUDT15 in Chinese IBD patients is higher than that of TPMT. NUDT15 polymorphism is a better predictor for AZA-induced leukopenia than TPMT polymorphism.