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Tight junctions (Cell biology) --- Junctions, Tight (Cell biology) --- Pentilaminar junctions (Cell biology) --- Zonula occludens --- Cell junctions --- Junctional complexes (Epithelium)

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Tight junctions (Cell biology) --- Life sciences. --- Biosciences --- Sciences, Life --- Science --- Junctions, Tight (Cell biology) --- Pentilaminar junctions (Cell biology) --- Zonula occludens --- Cell junctions --- Junctional complexes (Epithelium)

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ight junctions (TJs) are cell-ceil adhesion belts that encircle epithelial and endothelial cells at the limit between the apical and the lateral T-membrane. These junctions are crucial for the establishment of separate compartments in multicellular organisms and for the exchange of substances between the internal milieu and the external environment. The perception of TJs has changed over the years. From being regarded as static paracellular seals, they have come to be perceived as dynamic structures that adjust their morphol­ogy and function in response to physiological, pharmacological and pathologi­cal challenges. The roles that TJs play in epithelial and endothelial cells has also widened, and nowadays this structure is regarded not only as a fence that limits within the membrane, the movement of proteins and lipids between the apical and basolateral membranes, or as a gate that regulates in a size and charge selec­tive manner the transit of ion and molecules through the paracellular pathway, but also as a structure integrated by molecules that participate in the control of cell proliferation. These observations highlight the importance of understand­ing TJ physiology in order to develop effective strategies for the treatment of pathological conditions such as cancer and autoimmune diseases. This broader perception of TJs is reflected in all the chapters of the book and has been attained thanks to the identification in recent years of a wide array of proteins that constitute TJs in epithelial and endothelial cells as well as in central nervous system myelin.

Tight junctions (Cell biology) --- Cell junctions. --- Junctions, Cell --- Cell interaction --- Cell membranes --- Membrane fusion --- Junctions, Tight (Cell biology) --- Pentilaminar junctions (Cell biology) --- Zonula occludens --- Cell junctions --- Junctional complexes (Epithelium) --- Cytology. --- Neurosciences. --- Neurobiology. --- Oncology. --- Toxicology. --- Cell Biology. --- Cancer Research. --- Pharmacology/Toxicology. --- Chemicals --- Medicine --- Pharmacology --- Poisoning --- Poisons --- Tumors --- Neurosciences --- Neural sciences --- Neurological sciences --- Neuroscience --- Medical sciences --- Nervous system --- Cell biology --- Cellular biology --- Biology --- Cells --- Cytologists --- Toxicology --- Cell biology. --- Cancer research. --- Pharmacology. --- Drug effects --- Medical pharmacology --- Chemotherapy --- Drugs --- Pharmacy --- Cancer research --- Physiological effect

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For a long time, the tight junction (TJ) was known to form and regulate the paracellular barrier between epithelia and endothelial cell sheets. Starting shortly after the discovery of the proteins forming the TJ—mainly the two families of claudins and TAMPs—several other functions have been discovered, a striking one being the surprising finding that some claudins form paracellular channels for small ions and/or water. This Special Issue includes 43 articles covering numerous dedicated topics including pathogens affecting the TJ barrier, TJ regulation via immune cells, the TJ as a therapeutic target, TJ and cell polarity, function and regulation by proteins of the tricellular TJ, TJ as a regulator of cellular processes, organ- and tissue-specific functions, TJ as sensors and reacting to environmental conditions, and last but not least, TJ proteins and cancer.

Medicine --- tissue barrier --- tight junction --- claudins --- tricellulin --- tight junctions --- organ preservation --- intestine --- transplantation --- ischemia --- intestinal mucosa --- lung --- epithelia --- interleukin 13 --- UBE2Z --- ubiquitin --- osmolality --- hydrostatic pressure --- cancer --- sensor --- tricellular tight junctions --- endometrial cancer --- epithelial barrier dysfunction --- Claudin-7 --- permeability --- WNK4 --- epithelial sodium channel (ENaC), collecting duct cells --- claudin-1 --- hydrogen peroxide --- phosphorylation --- claudin --- angulin --- drug development --- angubindin-1 --- Clostridium perfringens enterotoxin --- Clostridium perfringens iota-toxin --- antibody --- Mz-ChA-1 cells --- biliary epithelial cells --- phosphatidylcholine --- mucus --- paracellular transport --- atopic dermatitis --- cytokines --- STAT3 --- ZO-2 --- cholestasis --- gene transcription --- hypertrophy --- tumor suppressor --- NLS --- NES --- CaSR --- RhoA --- barrier function --- paracellular permeability --- antidiuretic hormone --- Claudin-14 --- CLDN14 --- hearing loss --- vestibular function --- cochlear implantation --- Hepatitis C Virus --- viral entry --- epidermal barrier --- reconstructed human epidermis --- claudin targeting --- Campylobacter jejuni --- curcumin --- apoptosis --- co-culture --- mouse colon --- TNF --- NFκB --- lipolysis-stimulated lipoprotein receptor (LSR) --- epithelial barrier --- cell–cell contact --- caspase --- kidney stones --- ion reabsorption --- quercetin --- brain barriers --- blood-brain barrier --- neurovascular unit --- blood-cerebrospinal fluid barrier --- arachnoid barrier --- glia limitans --- adherens junctions --- paracellular sodium transport --- thick ascending limb --- nephropathy --- HELIX syndrome --- hypokalemia --- hypermagnesemia --- anhidrosis --- gland dysfunction --- aging --- blood–brain barrier --- mutations --- kidney --- liver --- skin --- human --- mice --- disease --- in silico --- drug discovery --- membrane proteins --- protein interactions --- molecular dynamics --- antibiotic-associated hemorrhagic colitis --- Klebsiella oxytoca --- tight junction assembly --- monocytes --- celiac disease --- claudin-2 --- epithelium --- inflammation --- fibrosis --- proliferation --- migration --- tricellular tight junction --- paracellular water transport --- tight epithelium --- MDCK C7 cells --- cell growth --- endothelia --- adherens junction --- apical junctional complex --- AMP-activated protein kinase (AMPK) --- paracellular barrier --- protein structure --- protein domain --- occludin --- junctional adhesion molecule --- zonula occludens --- MAGUK proteins --- PDZ domain --- stem cell --- chemoresistance --- retinal pigment epithelium --- retinopathy --- barrier formation --- collecting duct --- claudin-5 --- neuropathic pain --- nerve injury --- dorsal root ganglion --- enteropathogenic E. coli (EPEC) --- tight junctions (TJ) --- polarity --- atypical aPKCζ --- transepithelial electrical resistance (TER) --- sorting nexin 9 (SNX9) --- EspF --- claudin 1 --- tumor --- metastasis --- epithelial to mesenchymal transition --- cerebral cavernous malformation --- endothelial barrier --- Rho --- ROCK --- MEKK3 --- ion transport --- ion channel --- super-resolution microscopy --- structured illumination microscopy --- stimulated emission depletion --- single molecule localization microscopy --- Claudin --- blood-biliary barrier --- chronic liver disease --- hepatocellular carcinoma --- cholangiocellular carcinoma --- NISCH syndrome --- repair --- NHE2 --- ClC-2 --- inflammatory bowel disease --- mucosal immunology --- ZO-1 --- actomyosin --- aquaporin --- drinking rate --- epithelial fluid transport --- enterocyte --- osmoregulation --- paracellular --- proximal tubule --- calcium permeability --- claudin-12 --- paracellular channels and barriers --- cell polarity --- pathogens --- immune cells --- environmental sensors

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For a long time, the tight junction (TJ) was known to form and regulate the paracellular barrier between epithelia and endothelial cell sheets. Starting shortly after the discovery of the proteins forming the TJ—mainly the two families of claudins and TAMPs—several other functions have been discovered, a striking one being the surprising finding that some claudins form paracellular channels for small ions and/or water. This Special Issue includes 43 articles covering numerous dedicated topics including pathogens affecting the TJ barrier, TJ regulation via immune cells, the TJ as a therapeutic target, TJ and cell polarity, function and regulation by proteins of the tricellular TJ, TJ as a regulator of cellular processes, organ- and tissue-specific functions, TJ as sensors and reacting to environmental conditions, and last but not least, TJ proteins and cancer.

tissue barrier --- tight junction --- claudins --- tricellulin --- tight junctions --- organ preservation --- intestine --- transplantation --- ischemia --- intestinal mucosa --- lung --- epithelia --- interleukin 13 --- UBE2Z --- ubiquitin --- osmolality --- hydrostatic pressure --- cancer --- sensor --- tricellular tight junctions --- endometrial cancer --- epithelial barrier dysfunction --- Claudin-7 --- permeability --- WNK4 --- epithelial sodium channel (ENaC), collecting duct cells --- claudin-1 --- hydrogen peroxide --- phosphorylation --- claudin --- angulin --- drug development --- angubindin-1 --- Clostridium perfringens enterotoxin --- Clostridium perfringens iota-toxin --- antibody --- Mz-ChA-1 cells --- biliary epithelial cells --- phosphatidylcholine --- mucus --- paracellular transport --- atopic dermatitis --- cytokines --- STAT3 --- ZO-2 --- cholestasis --- gene transcription --- hypertrophy --- tumor suppressor --- NLS --- NES --- CaSR --- RhoA --- barrier function --- paracellular permeability --- antidiuretic hormone --- Claudin-14 --- CLDN14 --- hearing loss --- vestibular function --- cochlear implantation --- Hepatitis C Virus --- viral entry --- epidermal barrier --- reconstructed human epidermis --- claudin targeting --- Campylobacter jejuni --- curcumin --- apoptosis --- co-culture --- mouse colon --- TNF --- NFκB --- lipolysis-stimulated lipoprotein receptor (LSR) --- epithelial barrier --- cell–cell contact --- caspase --- kidney stones --- ion reabsorption --- quercetin --- brain barriers --- blood-brain barrier --- neurovascular unit --- blood-cerebrospinal fluid barrier --- arachnoid barrier --- glia limitans --- adherens junctions --- paracellular sodium transport --- thick ascending limb --- nephropathy --- HELIX syndrome --- hypokalemia --- hypermagnesemia --- anhidrosis --- gland dysfunction --- aging --- blood–brain barrier --- mutations --- kidney --- liver --- skin --- human --- mice --- disease --- in silico --- drug discovery --- membrane proteins --- protein interactions --- molecular dynamics --- antibiotic-associated hemorrhagic colitis --- Klebsiella oxytoca --- tight junction assembly --- monocytes --- celiac disease --- claudin-2 --- epithelium --- inflammation --- fibrosis --- proliferation --- migration --- tricellular tight junction --- paracellular water transport --- tight epithelium --- MDCK C7 cells --- cell growth --- endothelia --- adherens junction --- apical junctional complex --- AMP-activated protein kinase (AMPK) --- paracellular barrier --- protein structure --- protein domain --- occludin --- junctional adhesion molecule --- zonula occludens --- MAGUK proteins --- PDZ domain --- stem cell --- chemoresistance --- retinal pigment epithelium --- retinopathy --- barrier formation --- collecting duct --- claudin-5 --- neuropathic pain --- nerve injury --- dorsal root ganglion --- enteropathogenic E. coli (EPEC) --- tight junctions (TJ) --- polarity --- atypical aPKCζ --- transepithelial electrical resistance (TER) --- sorting nexin 9 (SNX9) --- EspF --- claudin 1 --- tumor --- metastasis --- epithelial to mesenchymal transition --- cerebral cavernous malformation --- endothelial barrier --- Rho --- ROCK --- MEKK3 --- ion transport --- ion channel --- super-resolution microscopy --- structured illumination microscopy --- stimulated emission depletion --- single molecule localization microscopy --- Claudin --- blood-biliary barrier --- chronic liver disease --- hepatocellular carcinoma --- cholangiocellular carcinoma --- NISCH syndrome --- repair --- NHE2 --- ClC-2 --- inflammatory bowel disease --- mucosal immunology --- ZO-1 --- actomyosin --- aquaporin --- drinking rate --- epithelial fluid transport --- enterocyte --- osmoregulation --- paracellular --- proximal tubule --- calcium permeability --- claudin-12 --- paracellular channels and barriers --- cell polarity --- pathogens --- immune cells --- environmental sensors