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The materials published in the Special Issue reflect the real diversity of echinoderm metabolites and cover most of their specific classes and biomedical potential as antioxidant, antiviral, anticancer, and even anticoagulant preparations. The metabolites include sea urchin naphtoquinoid pigments and their semi-synthetic derivatives, sea cucumber triterpene glycosides, esters of polyhydroxysteroids from starfish, sea urchins free sterols, and sea cucumber fucosylated chondroitin sulfates. This Special Issue, “Echinoderm Metabolites: Structure, Functions, and Biomedical Perspectives”, is a collection of articles about different scientific aspects concerning low molecular weight and biopolymer metabolites from echinoderms, including their isolation and chemical structures, biological activities, biosynthesis and evolution, biological functions, and obtaining of semi-synthetic derivatives of biologically active natural products. This Special Issue includes materials about sea urchin naphtoquinoid pigments and their semi-synthetic derivatives, sea cucumber triterpene glycosides, esters of polyhydroxysteroids from starfish, sea urchin free sterols, and sea cucumber fucosylated chondroitin sulfates.

prostate cancer --- thioglucoside conjugates --- natural products --- sea urchins --- glucose uptake --- polyhydroxysteroidal esters --- NMR spectra --- fatty acids --- starfish --- Ceramaster patagonicus --- cytostatic activity --- soft agar assay --- wound healing assay --- Colochirus quadrangularis --- triterpene glycosides --- quadrangularisosides --- sea cucumber --- cytotoxic activity --- Holothuria hilla --- Paracaudina chilensis --- fucosylated chondroitin sulfate --- anticoagulant activity --- echinochrome A --- echinamine A --- echinamine B --- herpes simplex virus type 1 --- Vero cells --- glycoprotein gD --- molecular docking --- Thyonidium kurilensis --- kurilosides --- Thenea muricata --- Aplysina sp. --- Pseudoanthomastus agaricus --- Montastraea cavernosa --- Buccinum sp. --- Pasiphaea tarda --- Phormosoma placenta --- Echinometra lucunter --- sterols --- gas chromatography --- mass spectrometry --- neuroblastoma Neuro-2a cells --- 5,8-dihydroxy-1,4-naphthoquinone --- O-glucoside --- thiomethylglycoside --- QSAR --- n/a

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Marine natural products are characterized by high chemical diversity, biochemical specificity, and other molecular properties that make them favorable as lead structures for drug discovery. In this field, one of the main problems is often the reduced natural availability of isolated substances, which can complicate both the structural characterization and possible future developments. For these reasons, the study of bioactive marine metabolites should rely on the development of chemical synthesis and synthetic strategies aimed at the preparation of pure compounds and analogs both for structural confirmation and/or for the large-scale preparation necessary for future applications. Moreover, natural products can be a crucial starting point for the preparation of molecules structurally inspired by the latter, opening the path to new classes of biologically active compounds with pharmacological potential. This book collects original research articles regarding synthetic strategies for secondary marine metabolites and/or analogs that favor applications of these molecules and/or solve structural challenges common in the field of natural substances.

Language --- organic synthesis --- meroterpenoids --- thiazinoquinones --- antiproliferative activity --- G0/G1 cell-cycle arrest --- cytostatic --- solid tumor cell lines --- alkylglycerol (AKG) --- ricinoleic acid (RA) --- antimicrobial activity --- structure-activity relationship (SAR) studies --- antibiotics (gentamicin --- tetracycline --- ciprofloxacin and ampicillin) --- marine-inspired --- breast cancer --- bis-indoles --- synthesis --- apoptosis --- carbohydrates --- polysaccharides --- semi-synthesis --- sulfation --- glycosylation --- fucose --- fucosylated chondroitin sulfate --- marine natural product --- largazole --- HDAC inhibitors --- modification --- fluoro olefin --- total synthesis --- natural product --- 7-deazapurine nucleoside --- disaccharide nucleoside --- tubercidin --- aureol --- tetracyclic meroterpenoids --- natural products synthesis --- labdane scaffold --- bioactive diterpenes --- sclareolide --- structure-activity relationships --- TRPV4 channel --- amides/esters --- COVID-19 --- SARS-CoV-2 --- lipophilic iminosugars --- polymer-supported triphenyl phosphine --- cholesterol --- antibacterial iminosugars --- organic synthesis --- meroterpenoids --- thiazinoquinones --- antiproliferative activity --- G0/G1 cell-cycle arrest --- cytostatic --- solid tumor cell lines --- alkylglycerol (AKG) --- ricinoleic acid (RA) --- antimicrobial activity --- structure-activity relationship (SAR) studies --- antibiotics (gentamicin --- tetracycline --- ciprofloxacin and ampicillin) --- marine-inspired --- breast cancer --- bis-indoles --- synthesis --- apoptosis --- carbohydrates --- polysaccharides --- semi-synthesis --- sulfation --- glycosylation --- fucose --- fucosylated chondroitin sulfate --- marine natural product --- largazole --- HDAC inhibitors --- modification --- fluoro olefin --- total synthesis --- natural product --- 7-deazapurine nucleoside --- disaccharide nucleoside --- tubercidin --- aureol --- tetracyclic meroterpenoids --- natural products synthesis --- labdane scaffold --- bioactive diterpenes --- sclareolide --- structure-activity relationships --- TRPV4 channel --- amides/esters --- COVID-19 --- SARS-CoV-2 --- lipophilic iminosugars --- polymer-supported triphenyl phosphine --- cholesterol --- antibacterial iminosugars

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Marine creatures are rich sources of glycoconjugate-containing glycans and have diversified structures. The advance of genomics has provided a valuable clue for their production and developments. This information will encourage breeding and engineering functional polysaccharides with slime ingredients in algae. These glycans will have the potential for applications to antioxidant, anticancer, and antimicrobial drugs in addition to health supplements and cosmetics. The combination of both biochemical and transcriptome approaches of marine creatures will lead to the opportunity to discover new activities of proteins such as glycan-relating enzymes and lectins. These proteins will also be used for experimental and medical purposes, such as diagnostics and trial studies. The topic of marine glycomics is also focusing on understanding the physiological properties of marine creatures, such as body defense against pathogens and cancers. In the competitions for natural selection, living creatures have evolved both their glycans and their recognition. They have primitive systems of immunity, and few of their mechanisms are closely related to glycans. If we are able to describe the accumulation of data of glycans of creatures living in the seashore and the oceans, we may be able to anticipate a time when we can talk about the ecosystem with glycans. That knowledge will be useful for the development of drugs that cure our diseases and for an understanding of living systems in addition to the preservation of living environments.

Research & information: general --- Biology, life sciences --- Acropora tenuis --- coral --- chemoattraction --- lectin --- white-spotted charr lectin --- oncolytic vaccinia virus --- interferon --- antiviral response --- Chlorella vulgaris --- Dunaliella salina --- Arthrospira platensis --- growth rate --- accumulation of carbohydrates --- biohydrogen --- antibacterial activity --- anticancer activity --- antifungal activity --- Aplysia kurodai --- apoptosis --- Ehrlich ascites carcinoma --- sulfated fucose-rich polysaccharides --- sulfated fucan --- fucosylated chondroitin sulfate --- fucoidan --- oral administration --- anticoagulant activity --- fucosylated glycosaminoglycan --- anticoagulant --- platelet aggregation --- contact activation --- hypotension --- pulmonary embolism --- sulfated polysaccharides --- marine hydrobionts --- antiparasitic activity --- protozoa --- malaria --- leishmaniasis --- trypanosomiasis --- schistosomiasis --- cryptosporidiosis --- trichomoniasis --- bivalve mollusk --- C1q domain-containing --- lectin-like --- pattern recognition receptor --- polysaccharides --- interstitial compartment --- marine worms --- sipunculids --- bioactive properties --- peptides --- rotifera --- pattern recognition receptors --- microbe-associated molecular patterns --- innate immunity --- C-type lectins --- C1q domain-containing proteins --- galectins --- bacterial exopolysaccharides --- bioflocculanting activity --- microalgae growth-promoting bacterium --- harmful algal bloom-forming dinoflagellate --- Alexandrium catenella --- Mameliella alba --- n/a