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Plasmodesmata (PD) are plant-specific intercellular nanopores defined by specialised domains of the plasma membrane (PM) and the endoplasmic reticulum (ER), both of which contain unique proteins, and probably different lipid compositions than the surrounding bulk membranes. The PD membranes form concentric tubules with a minimal outer diameter of only 50 nm, and the central ER strand constricted to ~10-15 nm, representing one of the narrowest stable membrane tubules in nature. This unique membrane architecture poses many biophysical, structural and functional questions. PM continuity across PD raises the question as to how a locally confined membrane site is established and maintained at PD. There is increasing evidence that the PM within PD may be enriched in membrane ‘rafts’ or TET web domains. Lipid rafts often function as signalling platforms, in line with the emerging view of PD as central players in plant defense responses. Lipid-lipid immiscibility could also provide a mechanism for membrane sub- compartmentalisation at PD. Intricate connections of the PM to the wall and the underlying cytoskeleton and ER may anchor the specialised domains locally. The ER within PD is even more strongly modified. Its extreme curvature suggests that it is stabilised by densely packed proteins, potentially members of the reticulon family that tubulate the cortical ER. The diameter of the constricted ER within PD is similar to membrane stalks in dynamin-mediated membrane fission during endocytosis and may need to be stabilised against spontaneous rupture. The function of this extreme membrane constriction, and the reasons why the ER is connected between plant cells remain unknown. Whilst the technically challenging search for the protein components of PD is ongoing, there has been significant recent progress in research on biological membranes that could benefit our understanding of PD function. With this Research Topic, we therefore aim to bring together researchers in the PD field and those in related areas, such as membrane biophysics, membrane composition and fluidity, protein-lipid interactions, lateral membrane heterogeneity, lipid rafts, membrane curvature, and membrane fusion/fission.

Plant cells and tissues. --- Plant cell culture. --- Plasmodesmata. --- lipid rafts --- membrane curvature --- plasmodesmata --- membrane microdomains --- plasma membrane --- protein-lipid interaction --- endoplasmic reticulum --- super-resolution microscopy

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Plasmodesmata (PD) are plant-specific intercellular nanopores defined by specialised domains of the plasma membrane (PM) and the endoplasmic reticulum (ER), both of which contain unique proteins, and probably different lipid compositions than the surrounding bulk membranes. The PD membranes form concentric tubules with a minimal outer diameter of only 50 nm, and the central ER strand constricted to ~10-15 nm, representing one of the narrowest stable membrane tubules in nature. This unique membrane architecture poses many biophysical, structural and functional questions. PM continuity across PD raises the question as to how a locally confined membrane site is established and maintained at PD. There is increasing evidence that the PM within PD may be enriched in membrane ‘rafts’ or TET web domains. Lipid rafts often function as signalling platforms, in line with the emerging view of PD as central players in plant defense responses. Lipid-lipid immiscibility could also provide a mechanism for membrane sub- compartmentalisation at PD. Intricate connections of the PM to the wall and the underlying cytoskeleton and ER may anchor the specialised domains locally. The ER within PD is even more strongly modified. Its extreme curvature suggests that it is stabilised by densely packed proteins, potentially members of the reticulon family that tubulate the cortical ER. The diameter of the constricted ER within PD is similar to membrane stalks in dynamin-mediated membrane fission during endocytosis and may need to be stabilised against spontaneous rupture. The function of this extreme membrane constriction, and the reasons why the ER is connected between plant cells remain unknown. Whilst the technically challenging search for the protein components of PD is ongoing, there has been significant recent progress in research on biological membranes that could benefit our understanding of PD function. With this Research Topic, we therefore aim to bring together researchers in the PD field and those in related areas, such as membrane biophysics, membrane composition and fluidity, protein-lipid interactions, lateral membrane heterogeneity, lipid rafts, membrane curvature, and membrane fusion/fission.

Plant cells and tissues. --- Plant cell culture. --- Plasmodesmata. --- lipid rafts --- membrane curvature --- plasmodesmata --- membrane microdomains --- plasma membrane --- protein-lipid interaction --- endoplasmic reticulum --- super-resolution microscopy --- lipid rafts --- membrane curvature --- plasmodesmata --- membrane microdomains --- plasma membrane --- protein-lipid interaction --- endoplasmic reticulum --- super-resolution microscopy

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The discovery of new drugs is one of pharmaceutical research's most exciting and challenging tasks. Unfortunately, the conventional drug discovery procedure is chronophagous and seldom successful; furthermore, new drugs are needed to address our clinical challenges (e.g., new antibiotics, new anticancer drugs, new antivirals).Within this framework, drug repositioning—finding new pharmacodynamic properties for already approved drugs—becomes a worthy drug discovery strategy.Recent drug discovery techniques combine traditional tools with in silico strategies to identify previously unaccounted properties for drugs already in use. Indeed, big data exploration techniques capitalize on the ever-growing knowledge of drugs' structural and physicochemical properties, drug–target and drug–drug interactions, advances in human biochemistry, and the latest molecular and cellular biology discoveries.Following this new and exciting trend, this book is a collection of papers introducing innovative computational methods to identify potential candidates for drug repositioning. Thus, the papers in the Special Issue In Silico Strategies for Prospective Drug Repositionings introduce a wide array of in silico strategies such as complex network analysis, big data, machine learning, molecular docking, molecular dynamics simulation, and QSAR; these strategies target diverse diseases and medical conditions: COVID-19 and post-COVID-19 pulmonary fibrosis, non-small lung cancer, multiple sclerosis, toxoplasmosis, psychiatric disorders, or skin conditions.

Medicine --- Pharmaceutical industries --- COVID-19 --- drug repurposing --- topological data analysis --- persistent Betti function --- SARS-CoV-2 --- network-based pharmacology --- combination therapy --- nucleoside GS-441524 --- fluoxetine --- synergy --- antidepressant --- natural compounds --- QSAR --- molecular docking --- drug repositioning --- UK Biobank --- vaccine --- LC-2/ad cell line --- drug discovery --- docking --- MM-GBSA calculation --- molecular dynamics --- cytotoxicity assay --- GWAS --- multiple sclerosis --- oxidative stress --- repurposing --- ADME-Tox --- bioinformatics --- complex network analysis --- modularity clustering --- ATC code --- hidradenitis suppurativa --- acne inversa --- transcriptome --- proteome --- comorbid disorder --- biomarker --- signaling pathway --- druggable gene --- drug-repositioning --- MEK inhibitor --- MM/GBSA --- Glide docking --- MD simulation --- MM/PBSA --- single-cell RNA sequencing --- pulmonary fibrosis --- biological networks --- p38α MAPK --- allosteric inhibitors --- in silico screening --- computer-aided drug discovery --- network analysis --- psychiatric disorders --- medications --- psychiatry --- mental disorders --- toxoplasmosis --- Toxoplasma gondii --- in vitro screening --- drug targets --- drug-disease interaction --- target-disease interaction --- DPP4 inhibitors --- lipid rafts

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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