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91.
Mohammad Bahram Tarquin Netherway Clémence Frioux Pamela Ferretti Luis Pedro Coelho Stefan Geisen Peer Bork Falk Hildebrand 《Environmental microbiology》2021,23(1):316-326
Bacteria and fungi are of uttermost importance in determining environmental and host functioning. Despite close interactions between animals, plants, their associated microbiomes, and the environment they inhabit, the distribution and role of bacteria and especially fungi across host and environments as well as the cross-habitat determinants of their community compositions remain little investigated. Using a uniquely broad global dataset of 13 483 metagenomes, we analysed the microbiome structure and function of 25 host-associated and environmental habitats, focusing on potential interactions between bacteria and fungi. We found that the metagenomic relative abundance ratio of bacteria-to-fungi is a distinctive microbial feature of habitats. Compared with fungi, the cross-habitat distribution pattern of bacteria was more strongly driven by habitat type. Fungal diversity was depleted in host-associated communities compared with those in the environment, particularly terrestrial habitats, whereas this diversity pattern was less pronounced for bacteria. The relative gene functional potential of bacteria or fungi reflected their diversity patterns and appeared to depend on a balance between substrate availability and biotic interactions. Alongside helping to identify hotspots and sources of microbial diversity, our study provides support for differences in assembly patterns and processes between bacterial and fungal communities across different habitats. 相似文献
92.
Vilmar Veldre Kessy Abarenkov Mohammad Bahram Florent Martos Marc-Andre Selosse Heidi Tamm Urmas Kõljalg Leho Tedersoo 《Fungal Ecology》2013,6(4):256-268
Fungi from the Ceratobasidiaceae family have important ecological roles as pathogens, saprotrophs, non-mycorrhizal endophytes, orchid mycorrhizal and ectomycorrhizal symbionts, but little is known about the distribution and evolution of these nutritional modes. All public ITS sequences of Ceratobasidiaceae were downloaded from databases, annotated with ecological and taxonomic metadata, and tested for the non-random phylogenetic distribution of nutritional modes. Phylogenetic analysis revealed six main clades within Ceratobasidiaceae and a poor correlation between molecular phylogeny and morphological–cytological characters traditionally used for taxonomy. Sequences derived from soil (representing putative saprotrophs) and orchid mycorrhiza clustered together, but remained distinct from pathogens. All nutritional modes were phylogenetically conserved in the Ceratobasidiaceae based on at least one index. Our analyses suggest that in general, autotrophic orchids form root symbiosis with available Ceratobasidiaceae isolates in soil. Ectomycorrhiza-forming capability has evolved twice within the Ceratobasidiaceae and it had a strong influence on the evolution of mycoheterotrophy and host specificity in certain orchid taxa. 相似文献
93.
Zahra Zandi Bahareh Kashani Davood Bashash Ensieh M. Poursani Seyed A. Mousavi Bahram Chahardoli Seyed H. Ghaffari 《Journal of cellular biochemistry》2020,121(2):1623-1634
Increasing pieces of evidence indicate that inflammatory processes facilitate tumorigenesis; tumor cells simulate the mechanisms by which innate immune cells produce pro-inflammatory cytokines to exploit them for their own survival and proliferation. Toll-like receptor 4 (TLR4), which serves as one of the most well-known receptors on the surface of the immune cells, is often expressed ectopically in the tumor cells resulting in tumor progression, invasion, and chemoresistance. In this study, we examined the anticancer effects of TAK-242, a small molecule inhibitor of TLR4, on different breast cancer cell lines: MCF7, SKBR3, MDA-MB-231, and BT-474. Our results showed that the TLR4 inhibition, as revealed by the downregulation of TLR4 downstream genes, exerted desirable cytotoxicity on the TLR4-expressing cells, at least partly, through the downregulation of EGFR and c-Myc genes. TAK-242 also inhibited the proliferation of anoikis-resistant cells and suppressed the clonal growth of the indicated cells. The results of this study propose a mechanistic pathway by which the inhibition of TLR4 using TAK-242 could augment apoptotic cell death through the alteration of both nuclear factor-кB- and p53-related apoptosis genes in breast cancer cells, especially cells with overexpression of TLR4. Taken together, this study supports the idea that the activation of inflammatory pathways may have a crucial role in breast cancer progression and the inhibition of TLR4 using TAK-242, either as a single agent or in combination, seems to be a novel promising strategy that could be clinically available in foreseeable future. 相似文献
94.
Carbohydrate-active enzymes involved in the secondary cell wall biogenesis in hybrid aspen 下载免费PDF全文
Aspeborg H Schrader J Coutinho PM Stam M Kallas A Djerbi S Nilsson P Denman S Amini B Sterky F Master E Sandberg G Mellerowicz E Sundberg B Henrissat B Teeri TT 《Plant physiology》2005,137(3):983-997
Wood formation is a fundamental biological process with significant economic interest. While lignin biosynthesis is currently relatively well understood, the pathways leading to the synthesis of the key structural carbohydrates in wood fibers remain obscure. We have used a functional genomics approach to identify enzymes involved in carbohydrate biosynthesis and remodeling during xylem development in the hybrid aspen Populus tremula x tremuloides. Microarrays containing cDNA clones from different tissue-specific libraries were hybridized with probes obtained from narrow tissue sections prepared by cryosectioning of the developing xylem. Bioinformatic analyses using the sensitive tools developed for carbohydrate-active enzymes allowed the identification of 25 xylem-specific glycosyltransferases belonging to the Carbohydrate-Active EnZYme families GT2, GT8, GT14, GT31, GT43, GT47, and GT61 and nine glycosidases (or transglycosidases) belonging to the Carbohydrate-Active EnZYme families GH9, GH10, GH16, GH17, GH19, GH28, GH35, and GH51. While no genes encoding either polysaccharide lyases or carbohydrate esterases were found among the secondary wall-specific genes, one putative O-acetyltransferase was identified. These wood-specific enzyme genes constitute a valuable resource for future development of engineered fibers with improved performance in different applications. 相似文献
95.
Elham Gholipour Houman Kahroba Nasim Soltani Parisa Samadi Parisa Sarvarian Sajjad VakiliSamiani Abbas Ali Hosein Pour Feizi Mohammad
Sadegh SoltaniZangbar Adel Baghersalimi Bahram Darbandi Aliakbar Movassaghpour Mehdi Talebi Roza Motavalli Amir Mehdizadeh Abdolhassan Kazemi Mehdi Yousefi 《Journal of cellular and molecular medicine》2022,26(16):4566
96.
International Microbiology - 相似文献
97.
International Microbiology - Fluoroquinolones (FQs) including ciprofloxacin (CIP) are key antibiotics for the treatment of Pseudomonas aeruginosa infections, but resistance to FQs is developing as... 相似文献
98.
Raphael Carapito Ekaterina L. Ivanova Aurore Morlon Linyan Meng Anne Molitor Eva Erdmann Bruno Kieffer Angélique Pichot Lydie Naegely Aline Kolmer Nicodème Paul Antoine Hanauer Frédéric Tran Mau-Them Nolwenn Jean-Marçais Susan M. Hiatt Gregory M. Cooper Tatiana Tvrdik Alison M. Muir Seiamak Bahram 《American journal of human genetics》2019,104(2):319-330
99.
100.
Julià L Amengual Antoni Valero-Cabré Misericordia Veciana de las Heras Nurja Rojo Seán Froudist-Walsh Pablo Ripollés Nils Bodammer Bahram Mohammadi Jordi Montero Carles Grau Thomas F Münte Antoni Rodríguez-Fornells 《BMC neurology》2012,12(1):1-14