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This Special Issue of Marine Drugs, entitled “Bioactive Marine Heterocyclic Compounds”, aimed to collect excellent original research articles and reviews focused on the isolation of new heterocyclic marine natural products, total synthesis, synthetic modification, or on finding important bioactivities of known heterocyclic marine natural products. As a result, five original papers on isolation and one synthetic study of metabolites from marine-derived bioorganisms or a marine sponge, along with one review paper on thiazole-based peptides, were published. I am proud to show these most recent works of outstanding scientists in this field and hope this Special issue will affect new drug developments or innovation in the future.

Medicine --- altercrasins --- Alternaria sp. --- Anthocidaris crassispina --- decalin derivatives --- cytotoxicity --- mangrove plant --- endophytic fungus --- Cladosporium cladosporioides --- polyketides --- antimicrobial activity --- acetylcholinesterase --- enzymatic inhibitory activity --- genome sequencing --- gene disruption --- lobophorin --- metabolic engineering --- genome mining --- solid-state fermentation --- solid-state extraction --- Chrysosporium lobatum --- marine fungi --- phenalenone derivatives --- antibiotics --- natural product --- P. gingivalis --- methicillin-resistant S. aureus --- azole-based peptide --- marine sponge --- peptide synthesis --- cyanobacteria --- thiazole --- bioactivity --- agesasines --- bromopyrrole alkaloid --- Agelas --- altercrasins --- Alternaria sp. --- Anthocidaris crassispina --- decalin derivatives --- cytotoxicity --- mangrove plant --- endophytic fungus --- Cladosporium cladosporioides --- polyketides --- antimicrobial activity --- acetylcholinesterase --- enzymatic inhibitory activity --- genome sequencing --- gene disruption --- lobophorin --- metabolic engineering --- genome mining --- solid-state fermentation --- solid-state extraction --- Chrysosporium lobatum --- marine fungi --- phenalenone derivatives --- antibiotics --- natural product --- P. gingivalis --- methicillin-resistant S. aureus --- azole-based peptide --- marine sponge --- peptide synthesis --- cyanobacteria --- thiazole --- bioactivity --- agesasines --- bromopyrrole alkaloid --- Agelas

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• Reference Manager
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This Special Issue of Marine Drugs, entitled “Bioactive Marine Heterocyclic Compounds”, aimed to collect excellent original research articles and reviews focused on the isolation of new heterocyclic marine natural products, total synthesis, synthetic modification, or on finding important bioactivities of known heterocyclic marine natural products. As a result, five original papers on isolation and one synthetic study of metabolites from marine-derived bioorganisms or a marine sponge, along with one review paper on thiazole-based peptides, were published. I am proud to show these most recent works of outstanding scientists in this field and hope this Special issue will affect new drug developments or innovation in the future.

altercrasins --- Alternaria sp. --- Anthocidaris crassispina --- decalin derivatives --- cytotoxicity --- mangrove plant --- endophytic fungus --- Cladosporium cladosporioides --- polyketides --- antimicrobial activity --- acetylcholinesterase --- enzymatic inhibitory activity --- genome sequencing --- gene disruption --- lobophorin --- metabolic engineering --- genome mining --- solid-state fermentation --- solid-state extraction --- Chrysosporium lobatum --- marine fungi --- phenalenone derivatives --- antibiotics --- natural product --- P. gingivalis --- methicillin-resistant S. aureus --- azole-based peptide --- marine sponge --- peptide synthesis --- cyanobacteria --- thiazole --- bioactivity --- agesasines --- bromopyrrole alkaloid --- Agelas

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Marine fungal natural products are well-known as the “blue gold,” as they have been promising leads for drug discovery and development. Even though marine fungi are less explored in comparison to their terrestrial counterparts, a number of useful hits have been obtained from a drug discovery perspective. Topics discussed in this book include a review on novel natural products from extremophilic fungi, secondary metabolites from deep-sea fungi; natural products from fungi in a symbiotic relationship with marine macro-organisms; and bioactive metabolites from sediment-derived fungi. Marine biologists, chemists, and pharmacologists will find the book a good reference material. The book covers various bioactive marine fungal natural products, and it is hoped that this book aids scientists explore fungal chemical diversity.

natural products --- extremophilic fungi --- biological activity --- deep-sea derived fungus --- Phialocephala sp. --- nitrogen-containing sorbicillinoids --- radical scavenging activity --- sponge-derived fungus --- Alternaria sp. --- perylenequinone derivatives --- X-ray single crystal diffraction --- cytotoxic activity --- antibacterial --- Phomopsis lithocarpus --- benzophenone derivatives --- eremophilane derivative --- aspochalasin --- tricyclic fused --- gut fungus --- cytotoxicity --- endophytic fungus --- Myrothecium sp. --- meroterpenoids --- isocoumarinoids --- α-glucosidase inhibitors --- salt-resistant plant --- Apocynum venetum --- Fusarium solani H915 --- bis-alkenoic acid esters --- fusaridioic acid A --- fusariumester A1 --- fusariumester A2 --- fusariumester B --- tea pathogenic fungi inhibitory effect --- herqueinones --- phenalenones --- Penicillium sp. --- marine-derived fungi --- adipogenesis --- anti-angiogenesis --- anti-inflammatory --- marine-derived fungus --- Aspergillus versicolor --- diketopiperazine --- anthraquinone derivatives --- Sporendonema casei --- cytotoxic activities --- antibacterial activities --- n/a

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The very first marine-derived anticancer drug, Cytarabine (aka Ara-C, Cytosar-U®), was approved by the FDA in 1969 for the treatment of leukemia. At the beginning of 2021, the list of approved marine-derived anticancer drugs consists of nine substances, five of which received approval within the last two years, demonstrating the rapid evolution of the field. The current book is a collection of scientific articles related to the exponentially growing field of anticancer marine compounds. These articles cover the whole field, from agents with cancer-preventive activity, to novel and previously characterized compounds with anticancer activity, both in vitro and in vivo, as well as the latest status of compounds under clinical development.

Medicine --- apoptosis --- fucoidan --- hepatocellular carcinoma --- reactive oxygen species --- 3-alkylpyridinium polymers --- nicotine --- nicotinic acetylcholine receptor --- non-small cell lung carcinoma --- melanoma --- sinulariolide --- proteomic --- mitochondria --- caspase cascade --- marine fungus --- sediment --- anthranilic acid --- Penicillium paneum --- cytotoxicity --- dibromotyrosine --- mitochondrial dysfunction --- oxidative stress --- topoisomerase --- epigonal organ --- bonnethead shark --- Jurkat --- tumor cell line --- hippuristanol --- PEL --- AP-1 --- STAT3 --- Akt --- colorectal cancer --- marine mollusc --- brominated indoles --- shrimp --- chemoprevention --- fatty acids --- carotenoids --- cancer --- nanoparticle --- osteosarcoma --- lung metastasis --- elisidepsin --- lipid rafts --- hydroxylated lipids --- fatty acid 2-hydroxylase --- cooperative binding --- membrane permeabilization --- marine organisms --- polysaccharides --- anticancer --- anticarcinogenic --- mechanisms of action --- fumigaclavine C --- anti-proliferation --- mitochondrial pathway --- anti-cancer --- anti-proliferative --- carotenoid --- cell cycle arrest --- fucoxanthin --- azoxymethane --- bioactive natural product --- isatin --- in vivo model --- Marthasterias glacialis L. --- palmitic acid --- ER-stress --- CHOP --- Antibody Drug Conjugates (ADCs) --- marine antitumor agents --- clinical trials --- approved antitumor agents --- AD0157 --- angiogenesis --- marine drug --- pyrrolidinedione --- secondary metabolites --- cancer preventive --- chemopreventive --- trabectedin --- plitidepsin --- tumor-associated macrophages --- tumor microenvironment --- preclinical --- anticancer immunity --- antiangiogenesis --- fascaplysin --- cyclin-dependent kinase --- small cell lung cancer --- camptothecin --- poly(ADP-ribose)-polymerase inhibitor --- breast cancer --- seaweed --- therapeutic compounds --- autophagy --- marine drugs --- autophagy inhibitors --- autophagy inducers --- macrolide --- programmed cell death --- energy stress --- araguspongine C --- c-Met --- HER2 --- gemcitabine --- pazopanib --- phase I --- safety --- soft tissue sarcoma --- pachastrissamine --- jaspine B --- carbocyclic analogue --- sphingosine kinase inhibitor --- molecular modeling --- ET-743 --- DNA minor groove binder --- soft tissue sarcoma --- chemotherapy --- bis (2,3-dibromo-4,5-dihydroxy-phenyl)-methane (BDDPM) --- anti-metastatic activity --- cell adhesion --- β1-integrin --- FAK --- BEL-7402 cell --- triterpene glycosides --- sea cucumbers --- antitumor activities --- arrest of cell cycle --- antibacterial --- marangucyclines --- deep-sea --- Streptomyces sp. SCSIO 11594 --- LS-1 --- SNU-C5/5-FU --- TGF-β signaling --- carcinoembryonic antigen --- kalkitoxin --- Moorea producens --- mitochondria toxin --- VEGF --- angiogenesis inhibitor --- hypoxia-inducible factor-1 --- HIF-1 --- Lyngbya majuscula --- marine metabolites --- SZ-685C --- nonfunctioning pituitary adenomas --- Ecklonia cava --- phlorotannins --- dieckol --- migration --- sipholenol A --- ABC transporter --- multidrug resistance --- P-gp/ABCB1 --- BCRP/ABCG2 --- MRP1/ABCC1 --- marine natural products --- glioblastoma --- xyloketal B --- proliferation --- TRPM7 --- marine compound --- ribosomal protein genes --- snoRNA --- FAU --- RPS30 --- SNORA62 --- evolution --- Porifera --- Penicillium brevicompactum --- Brevianamide --- Mycochromenic acid derivative --- antifouling --- Caribbean sponge --- plakortide --- endoperoxide --- leukemia --- multi-drug resistant leukemia --- Sarcophyton ehrenbergi --- soft coral --- terpenes --- cembranoids --- cytotoxic activity --- molecular docking --- uveal melanoma --- oxidative stress --- virtual screening --- Topo I inhibitor --- low toxic --- natural product --- Ulva fasciata --- selenium-containing polysaccharide-protein complex --- pseudopterosin --- NF-κB --- p65 --- inflammation --- cytokine release --- IL-6 --- TNFα --- MCP-1 --- glucocorticoid receptor --- paulomycins --- Micromonospora --- antitumor --- Cantabrian Sea-derived actinobacteria --- puupehenones --- sponges --- antiangiogenic --- antitumoral --- porifera/sponge --- cancer genes --- molecular oncology --- bromophenol --- molecular mechanisms --- cell cycle --- PI3K/Akt --- p38/ERK --- ROS --- human lung cancer --- glycosaminoglycans --- antiproliferative --- heparan sulphate --- gliotoxin --- NSCLC --- adriamycin resistance --- Sepia ink polysaccharides --- antitumour --- chemosensitization --- anticoagulation --- sea anemone --- drug discovery --- endothelial cells --- RGD motif --- kunitz type inhibitor --- prostate cancer --- antioxidant --- natural marine compounds --- marine biotechnology --- microalgae --- marine sponges --- Aeroplysinin --- Isofistularin --- pheochromocytoma and paraganglioma --- metastasis --- cancer progression --- cell adhesion molecules --- integrin β1 --- hypoxia --- phycocyanin --- non-small cell lung cancer --- NF-κB signaling --- marine-derived drugs --- bioanalysis --- chromatography --- manzamine A --- epithelial-mesenchymal transition --- lung cancer --- circulating tumor cells --- signal transduction --- cisplatin --- Lampetra morii --- buccal gland --- cystatin F --- anti-angiogenesis --- cystatin superfamily --- Antimicrobial peptide (AMP) --- Tilapia piscidin 4 (TP4) --- non-small cell lung cancer (NSCLC) --- itampolin A --- FBDD --- p38α --- novel inhibitor --- tetracenomycin X --- cyclin D1 --- proteasomal degradation --- p38 --- c-JUN --- λ-carrageenan --- heparanase --- anticoagulant --- depolymerisation --- cell migration --- Aspergillus --- naphthopyrones --- endophytic fungus --- Leathesia nana --- mangrove-derived actinomycete --- ansamycins --- divergolides --- apoptosis-inducing activity --- actinomycin --- EMT --- invasion --- low molecular weight fucoidan extract --- N-Ras --- neuroblastoma-rat sarcoma --- Cancer --- programmed cell death-ligand 1 --- programmed cell death-ligand 2 --- human sarcoma cell line (HT1080 cells) --- human normal diploid fibroblast (TIG-1 cells) --- chimera --- chemical conjugation --- anticancer agent --- hybridization --- α9-nicotinic acetylcholine receptors (nAChRs) --- breast cancer cells --- αO-conotoxin GeXIVA --- targeted therapy --- gorgonian --- Leptogorgia --- humulane sesquiterpenoids --- anticancer activity --- 12-deacetyl-12-epi-scalaradial --- HeLa cells --- Nur77 --- MAPK/ERK pathway --- Mycalin A --- C15 acetogenins --- synthetic analogues --- antiproliferative activity --- A375 and HeLa cell lines --- polyoxygenated steroids --- sponge --- Haliclona gracilis --- Thalassia testudinum --- thalassiolin B --- polyphenols --- CYP1A1 --- benzo[a]pyrene --- JNK1/2 --- natural products --- synergism --- A549 cells --- cytoskeleton --- P2X7 receptor --- pollution --- anti-angiogenic --- gene expression --- HSP90 --- inhibitor --- apoptosis --- fucoidan --- hepatocellular carcinoma --- reactive oxygen species --- 3-alkylpyridinium polymers --- nicotine --- nicotinic acetylcholine receptor --- non-small cell lung carcinoma --- melanoma --- sinulariolide --- proteomic --- mitochondria --- caspase cascade --- marine fungus --- sediment --- anthranilic acid --- Penicillium paneum --- cytotoxicity --- dibromotyrosine --- mitochondrial dysfunction --- oxidative stress --- topoisomerase --- epigonal organ --- bonnethead shark --- Jurkat --- tumor cell line --- hippuristanol --- PEL --- AP-1 --- STAT3 --- Akt --- colorectal cancer --- marine mollusc --- brominated indoles --- shrimp --- chemoprevention --- fatty acids --- carotenoids --- cancer --- nanoparticle --- osteosarcoma --- lung metastasis --- elisidepsin --- lipid rafts --- hydroxylated lipids --- fatty acid 2-hydroxylase --- cooperative binding --- membrane permeabilization --- marine organisms --- polysaccharides --- anticancer --- anticarcinogenic --- mechanisms of action --- fumigaclavine C --- anti-proliferation --- mitochondrial pathway --- anti-cancer --- anti-proliferative --- carotenoid --- cell cycle arrest --- fucoxanthin --- azoxymethane --- bioactive natural product --- isatin --- in vivo model --- Marthasterias glacialis L. --- palmitic acid --- ER-stress --- CHOP --- Antibody Drug Conjugates (ADCs) --- marine antitumor agents --- clinical trials --- approved antitumor agents --- AD0157 --- angiogenesis --- marine drug --- pyrrolidinedione --- secondary metabolites --- cancer preventive --- chemopreventive --- trabectedin --- plitidepsin --- tumor-associated macrophages --- tumor microenvironment --- preclinical --- anticancer immunity --- antiangiogenesis --- fascaplysin --- cyclin-dependent kinase --- small cell lung cancer --- camptothecin --- poly(ADP-ribose)-polymerase inhibitor --- breast cancer --- seaweed --- therapeutic compounds --- autophagy --- marine drugs --- autophagy inhibitors --- autophagy inducers --- macrolide --- programmed cell death --- energy stress --- araguspongine C --- c-Met --- HER2 --- gemcitabine --- pazopanib --- phase I --- safety --- soft tissue sarcoma --- pachastrissamine --- jaspine B --- carbocyclic analogue --- sphingosine kinase inhibitor --- molecular modeling --- ET-743 --- DNA minor groove binder --- soft tissue sarcoma --- chemotherapy --- bis (2,3-dibromo-4,5-dihydroxy-phenyl)-methane (BDDPM) --- anti-metastatic activity --- cell adhesion --- β1-integrin --- FAK --- BEL-7402 cell --- triterpene glycosides --- sea cucumbers --- antitumor activities --- arrest of cell cycle --- antibacterial --- marangucyclines --- deep-sea --- Streptomyces sp. SCSIO 11594 --- LS-1 --- SNU-C5/5-FU --- TGF-β signaling --- carcinoembryonic antigen --- kalkitoxin --- Moorea producens --- mitochondria toxin --- VEGF --- angiogenesis inhibitor --- hypoxia-inducible factor-1 --- HIF-1 --- Lyngbya majuscula --- marine metabolites --- SZ-685C --- nonfunctioning pituitary adenomas --- Ecklonia cava --- phlorotannins --- dieckol --- migration --- sipholenol A --- ABC transporter --- multidrug resistance --- P-gp/ABCB1 --- BCRP/ABCG2 --- MRP1/ABCC1 --- marine natural products --- glioblastoma --- xyloketal B --- proliferation --- TRPM7 --- marine compound --- ribosomal protein genes --- snoRNA --- FAU --- RPS30 --- SNORA62 --- evolution --- Porifera --- Penicillium brevicompactum --- Brevianamide --- Mycochromenic acid derivative --- antifouling --- Caribbean sponge --- plakortide --- endoperoxide --- leukemia --- multi-drug resistant leukemia --- Sarcophyton ehrenbergi --- soft coral --- terpenes --- cembranoids --- cytotoxic activity --- molecular docking --- uveal melanoma --- oxidative stress --- virtual screening --- Topo I inhibitor --- low toxic --- natural product --- Ulva fasciata --- selenium-containing polysaccharide-protein complex --- pseudopterosin --- NF-κB --- p65 --- inflammation --- cytokine release --- IL-6 --- TNFα --- MCP-1 --- glucocorticoid receptor --- paulomycins --- Micromonospora --- antitumor --- Cantabrian Sea-derived actinobacteria --- puupehenones --- sponges --- antiangiogenic --- antitumoral --- porifera/sponge --- cancer genes --- molecular oncology --- bromophenol --- molecular mechanisms --- cell cycle --- PI3K/Akt --- p38/ERK --- ROS --- human lung cancer --- glycosaminoglycans --- antiproliferative --- heparan sulphate --- gliotoxin --- NSCLC --- adriamycin resistance --- Sepia ink polysaccharides --- antitumour --- chemosensitization --- anticoagulation --- sea anemone --- drug discovery --- endothelial cells --- RGD motif --- kunitz type inhibitor --- prostate cancer --- antioxidant --- natural marine compounds --- marine biotechnology --- microalgae --- marine sponges --- Aeroplysinin --- Isofistularin --- pheochromocytoma and paraganglioma --- metastasis --- cancer progression --- cell adhesion molecules --- integrin β1 --- hypoxia --- phycocyanin --- non-small cell lung cancer --- NF-κB signaling --- marine-derived drugs --- bioanalysis --- chromatography --- manzamine A --- epithelial-mesenchymal transition --- lung cancer --- circulating tumor cells --- signal transduction --- cisplatin --- Lampetra morii --- buccal gland --- cystatin F --- anti-angiogenesis --- cystatin superfamily --- Antimicrobial peptide (AMP) --- Tilapia piscidin 4 (TP4) --- non-small cell lung cancer (NSCLC) --- itampolin A --- FBDD --- p38α --- novel inhibitor --- tetracenomycin X --- cyclin D1 --- proteasomal degradation --- p38 --- c-JUN --- λ-carrageenan --- heparanase --- anticoagulant --- depolymerisation --- cell migration --- Aspergillus --- naphthopyrones --- endophytic fungus --- Leathesia nana --- mangrove-derived actinomycete --- ansamycins --- divergolides --- apoptosis-inducing activity --- actinomycin --- EMT --- invasion --- low molecular weight fucoidan extract --- N-Ras --- neuroblastoma-rat sarcoma --- Cancer --- programmed cell death-ligand 1 --- programmed cell death-ligand 2 --- human sarcoma cell line (HT1080 cells) --- human normal diploid fibroblast (TIG-1 cells) --- chimera --- chemical conjugation --- anticancer agent --- hybridization --- α9-nicotinic acetylcholine receptors (nAChRs) --- breast cancer cells --- αO-conotoxin GeXIVA --- targeted therapy --- gorgonian --- Leptogorgia --- humulane sesquiterpenoids --- anticancer activity --- 12-deacetyl-12-epi-scalaradial --- HeLa cells --- Nur77 --- MAPK/ERK pathway --- Mycalin A --- C15 acetogenins --- synthetic analogues --- antiproliferative activity --- A375 and HeLa cell lines --- polyoxygenated steroids --- sponge --- Haliclona gracilis --- Thalassia testudinum --- thalassiolin B --- polyphenols --- CYP1A1 --- benzo[a]pyrene --- JNK1/2 --- natural products --- synergism --- A549 cells --- cytoskeleton --- P2X7 receptor --- pollution --- anti-angiogenic --- gene expression --- HSP90 --- inhibitor