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Topic: Zonula occludens

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	[No title]
		Zonula occludens toxin structure –function analysis: identification of the fragment biologically active on tight junctions and of the zonulin receptor binding domain.
		Zonula occludens toxin (Zot) interferes with the induction of nasal tolerance to gliadin.
		Effect of the biologically active fragment of zonula occludens toxin, DeltaG, on the intestinal paracellular transport and oral absorption of mannitol.
	medschool.umaryland.edu /FACULTYRESEARCHPROFILE/viewprofile.aspx?id=1891 (2019 words)

	Cell Isolation Theory
		On the lateral surfaces of adjacent epithelial cells there are four distinct types of intercellular bonds: the zonula occludens, zonula adherens, macula adherens and nexus.
		In the zonula occludens, or "tight junction", there are multiple sites of actual fusion of the adjacent unit membranes interspersed by short regions of unit membrane separation of approximately 100-150 Å.
		In a zonula adherens, or "intermediate junction", a fine network of cytoplasmic filaments radiates from the cell membrane into the cytoplasm.
	www.tissuedissociation.com /theory.html (2479 words)

	Tjp1 - Tight junction protein ZO-1
		Colocalization of Cx43 and of the tight-junction- associated protein zonula occludens 1 (ZO-1) was demonstrated in seminiferous tubules by using dual-label immunofluorescence in conjunction with confocal microscopy.
		Zonula occludens proteins (ZOPs), currently comprising ZO-1, ZO-2, and ZO-3, belong to the family of membrane-associated guanylate kinase homologue (MAGUK) proteins that are involved in the organization of epithelial and endothelial intercellular junctions.
		To this purpose, we used two tight junction markers, the Zonula occludens (ZO-1) and claudin-1 proteins, and a glial marker, the aquaporin-4 (AQP4) protein, whose expression is correlated with BBB differentiation and integrity.
	www.pdg.cnb.uam.es /UniPub/iHOP/gg/125591.html (5429 words)

	TJP2 - Tight junction protein ZO-2 (Site not responding. Last check: 2007-10-07)
		Zonula occludens (ZO)-1 and ZO-2: membrane-associated guanylate kinase homologues (MAGuKs) of the tight junction.
		One of the tight junction components, zonula occludens protein 2 (ZO-2), is expressed as two isoforms, ZO-2A and ZO-2C, in normal epithelia.
		We have observed that 2 forms of zonula occludens 2 (ZO-2) protein, ZO-2A and ZO-2C, are expressed in normal human pancreatic duct cells, but only ZO-2C in pancreatic duct adenocarcinoma.
	www.pdg.cnb.uam.es /UniPub/iHOP/gi/94634.html (686 words)

	Loss of the tight junction proteins occludin and zonula occludens-1 from cerebral vascular endothelium during ...
		Loss of the tight junction proteins occludin and zonula occludens-1 from cerebral vascular endothelium during neutrophil-induced blood-brain barrier breakdown in vivo.
		These particular vessels displayed an increase in phosphotyrosine staining, loss of the tight junctional proteins, occludin and zonula occludens-1, and apparent redistribution of the adherens junction protein vinculin.
		Our results have established an endothelial cell molecular profile associated with leucocyte-induced blood-brain barrier breakdown in vivo, and the relevance of different in vitro cell culture models may now be viewed more objectively.
	www.arclab.org /medlineupdates/abstract_9697130.html (275 words)

	Trophectoderm differentiation in the bovine embryo: characterization of a polarized epithelium -- Barcroft et al. 114 ...
		The present study was conducted to characterize the mRNA expression and distribution of polypeptides encoding E-cadherin, beta-catenin, and the tight junction associated protein, zonula occludens protein 1, in pre-attachment bovine embryos, in vitro.
		Zonula occludens protein 1 immunoreactivity was undetectable until the morula stage and first appeared as punctate points between the outer cells.
		In the blastocyst, zonula occludens protein 1 was localized as a continuous ring at the apical points of trophectoderm cell contact and was undetectable in the inner cell mass.
	www.reproduction-online.org /cgi/content/abstract/114/2/327 (439 words)

	III. Tubular Anatomy and Function
		Around each cell near its luminal or apical face is a circumferential belt, the zonula occludens (tight junction) which connects it with neighboring cells.
		The width of the zonula occludens and the paracellular space have been greatly exaggerated for purposes of emphasis.
		The zonula occludens surrounding these cells has a low permeability to Na so there is little passive diffusion back into the lumen and the cells can reduce the urine Na concentration to very low levels.
	www2.kumc.edu /ki/physiology/course/three/3_1.htm (514 words)

	Epithelium
		zonula adherens, which also completely encircles each cell, but the adjacent plasma membranes are separated by a gap of about 20 nm.
		While it is the zonula occludens of the junctional complex that principally affects this function, it is the adhesive properties of the zonula and macula adherens which guard against physical disruption of the barrier.
		Cell-cell and cell-extracellular matrix (ECM) adhesive interactions are clearly important in maintaining the integrity of epithelial sheets, and in some disease states--most noticeably inflammation, tumor invasion and metastasis (the spread of cancer cells from one site to another).
	neuromedia.neurobio.ucla.edu /campbell/lectures/Epithelium.htm (2312 words)

	Gene encoding zonula occludens toxin (zot) does not occur independently from cholera enterotoxin genes (ctx) in Vibrio ...
		Gene encoding zonula occludens toxin (zot) does not occur independently from cholera enterotoxin genes (ctx) in Vibrio cholerae -- Johnson et al.
		Gene encoding zonula occludens toxin (zot) does not occur independently from cholera enterotoxin genes (ctx) in Vibrio cholerae
		zonula occludens toxin (zot) or cholera toxin (ctx) genes, 3.0% of non- O1,
	jcm.asm.org /cgi/content/abstract/31/3/732 (181 words)

	GlutenSensitivity.net Tests Comparison
		Between these cells are the “tight junctions” (also referred to as the zonula occludens).
		Researchers at the Center for Vaccine Development at the University of Maryland were trying to develop a vaccine for the cholera bacterium (cholera is one of the leading causes of death in children worldwide, and it causes a profuse, watery diarrhea).
		The researchers discovered that cholera causes diarrhea by secreting a toxin called Zot (zonula occludens toxin), which can open the tight junctions (zonula occludens), thereby contributing to the severe, life-threatening diarrhea.
	glutensensitivity.net /testing.htm (5769 words)

	Epithelial tissue
		Zonula occludens form a complete, tight seal and prevent the passage of material across the epithelium (e.g., macromolecules are prevented from passing from the intestinal lumen into the intercellular space).
		Together, the zonula occludens, zonula adherens, and macula adherens constitute the junctional complex visible in the electron microscope.
		The microfilaments from the microvilli and zonula adherens, as well as the tonofilaments from the desmosomes, all intermingle to some degree within the terminal web.
	anatomy.iupui.edu /courses/histo_D502/D502f02/Epithelia/Epithelia.html (1788 words)

	Zonula Occludens Toxin Acts as an Adjuvant through Different Mucosal Routes and Induces Protective Immune Responses -- ...
		Fasano, A. Regulation of intercellular tight junctions by Zonula occludens toxin and its eukaryotic analogue zonulin.
		Zonula occludens toxin modulates tight junctions through protein kinase C-dependent actin reorganization, in vitro.
		Zonula occludens toxin is a powerful mucosal adjuvant for intranasally delivered antigens.
	iai.asm.org /cgi/content/full/71/4/1897 (4512 words)

	Age-related changes in rat cerebral occludin and zonula occludens-1 (ZO-1). (Site not responding. Last check: 2007-10-07)
		Age-related changes in rat cerebral occludin and zonula occludens-1 (ZO-1).
		Since aging is associated with significant alterations in the blood-brain barrier (BBB) it is possible that specific tight junction proteins may be altered in the cerebrum of aging rats.
		To test this hypothesis, Western and Northern blot analysis were carried out to measure the steady-state level of occludin and zonula occludens-one (ZO-1) proteins and their mRNA in cerebral tissue of 3-, 12- and 24-month-old rats.
	www.arclab.org /medlineupdates/abstract_12633933.html (145 words)

	BBB anatomy and physiology of cerebral capillary endothelia (Site not responding. Last check: 2007-10-07)
		The complex is classified as macula and zonula adhaerens and zonula occludens.
		Claudins comprise a multigene family and to date there are 20 claudin isomers, which form dimers that bind homotypically to claudins on adjacent endothelial cells to form the primary seal of the tight junction (Furuse et al., 1999).
		Zonula occludens (ZO-1/2/3) are cytoplasmic proteins that interact with occludin and serve to as recognition proteins for tight junctional placement, and support structure for signal transduction proteins (Haskins, et al., 1998).
	users.ahsc.arizona.edu /davis/bbbanatomy.htm (1104 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		Zonula occludens Nuclear pores Macula adherens Gap junction All of the above E: Freeze fracturing is a method by which the individual leaflets is a lipid bilayer can be studied separately.
		Zonulae adherens requires cadherin and calcium to form a stable junction.
		Zonula occludens (tight junctions) separate the apical from baso-lateral surfaces.
	www.student.med.umn.edu /knowledge/packets0405/Histology/2003HistoExam1Explained.doc (5935 words)

	Rat Genome Database: References
		A systematic analysis of 40 random genes in cultured vascular smooth muscle subtypes reveals a heterogeneity of gene expression and identifies the tight junction gene zonula occludens 2 as a marker of epithelioid "pup" smooth muscle cells and a participant in carotid neointimal formation.
		The following 5 consistently differentially expressed genes were identified in vitro: zonula occludens 2 (ZO-2); peroxisome proliferator-activated receptor delta (PPARdelta); secreted protein, acidic and rich in cysteine (SPARC); alpha1(I)collagen; and A2, an uncharacterized gene.
		We examined these 5 clones during carotid artery injury and an inconsistently differentially expressed clone Krox-24 because, as an early response transcription factor, it could be involved in the injury response.
	rgd.mcw.edu /tools/references/references_view.cgi?id=631940 (378 words)

	Epithelial Tissue
		This is called a fascia occludens (e.g., the endothelium of blood vessels).
		There are two types of adhering junctions: (1) zonula adherens and (2) macula adherens.
		The zonula adherens is also the site for the attachment of a circumferential band of microfilaments located just deep to the membrane.
	anatomy.iupui.edu /courses/histo_D502/D502f03/f03_lectures/Epitheliaf03/Epithf03.html (1768 words)

	LLU - EPITHELIUM
		Zonula adherens - similar to a desmosome but forms a continuous belt-like band surrounding the apex of columnar cells and the intercellular substances is usually not visible.
		Zonula occludens - (tight junctions) provide the seal.
		Simple squamous epithelium - Provides a minimal boundary having zonula occludens with variable permeability between different tissue compartments.
	www.llu.edu /llu/medicine/anatomy/glossary/syllabus/Epithelia.htm (1028 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		In MDCKII cells, this complex localizes to the zonula occludens (tight junctions) and appears to regulate epithelial polarity.
		affects the formation and maintenance of the zonula adherens in the polarized epithelia of the retina, neural tube, and digestive tract, leading to novel phenotypes, such as the formation of multiple lumens in the developing intestine.
		is required for the formation and maintenance of the zonula adherens during early epithelial development in vertebrates and demonstrate a previously undescribed yet critical role for this protein in organ morphogenesis.
	www.elsevier.com /cdweb/journals/09609822/articles/11/19/S096098220100458.abstract.en (233 words)

	Graduate Students
		Major emphasis is on investigation and evaluation of the use of novel absorption enhancers (Zonula Occludens Toxin and Delta G) as well as the use of potential P-glycoprotein inhibitors (Enaminones).
		"The Active Fragment of Zonula Occludens Toxin (Zot), Delta G, Increases the In Vitro Transport and the In Vivo Absorption of the Hydrophilic Paracellular Markers, Mannitol and Inulin and the Hydrophobic Anti-Cancer Agent, Paclitaxel" American Association of Pharmaceutical Scientists annual meeting, Toronto, Canada, November 10-14, 2002.
		"Effect of the Active Fragment of Zonula Occludens Toxin (ZOT), Delta G, on the Oral Bioavailability of Mannitol" 24th annual Graduate research Conference, Baltimore County, Baltimore, MD, April 19, 2002.
	www.pharmacy.umaryland.edu /faculty/tdowling/Noha.htm (567 words)

	Caption (Site not responding. Last check: 2007-10-07)
		The terminal bar (arrow), visualized as dark spots that punctuate the terminal web at the point where two cells touch at their apical margins, marks the location of the apical junctional complex.
		This complex consists of the zonula occludens junction, which forms a water tight seal around the apex of the columnar epithelial cells and the zonula adheres junction, which attaches adjacent cells firmly together.
		The zonula adherens junction is reinforced by a band of actin microfilaments located on the cytoplasmic face of the plasma membrane.
	casweb.cas.ou.edu /pbell/histology/Captions/Epithelium/il.t.bar.plast.100x.html (86 words)

	NZSAP 2004 Proceedings: Abstract AB04013 (Site not responding. Last check: 2007-10-07)
		Expression of the tight junction protein zonula occludens-1 during mammary engorgement
		An increase in tight junction (TJ) permeability occurs during extended milking intervals and is associated with reduced milk secretion.
		This paper examines temporal changes in the expression of a major TJ protein, zonula occludens-1 (ZO-1), during mammary engorgement.
	nzsap.org.nz /proc/2004/ab04013.html (251 words)

	High Glucose Concentration in Isotonic Media Alters Caco-2 Cell Permeability
		In parallel, distribution of the actin filament (F-actin) and zonula occludens-1 (ZO-1) proteins was assessed by confocal microscopy.
		Transepithelial fluxes of mannitol, hydrocortisone, digoxin, and glycyl sarcosine (Gly-Sar) that permeate the intestinal mucosa by various pathways were measured to quantify the effect of glucose-induced changes on Caco-2 cell permeability.
		The objective of the present study was to evaluate the effect of nonphysiological glucose concentration in isotonic media on barrier properties of Caco-2 cell monolayers restricting paracellular and transcellular solute transport.
	www.aapsj.org /view.asp?art=ps050324 (4403 words)

	Connexin45 interacts with zonula occludens-1 and connexin43 in osteoblastic cells. (Site not responding. Last check: 2007-10-07)
		Connexin45 interacts with zonula occludens-1 and connexin43 in osteoblastic cells.
		Connexin45 interacts with zonula occludens-1 and connexin43 in osteoblastic cells.The relative expression of connexin43 and connexin45 modulates gap junctional communication and production of bone matrix proteins in osteoblastic cells.
		These studies demonstrate that ZO-1 interacts with Cx45 as well as with Cx43, and suggest that the interaction of connexins with ZO-1 may play a role in regulating the composition of the gap junction and may modulate connexin-connexin interactions.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/8992478.html (231 words)

	Rat Genome Database: References
		Diabetes-related changes in rat cerebral occludin and zonula occludens-1 (ZO-1) expression.
		Since experimental diabetes mellitus is associated with considerable alterations in the blood-brain barrier (BBB), it is possible that specific tight junction proteins may be altered in diabetes.
		To test this hypothesis, Western and Northern blot analysis were carried out to measure the steady-state level of occludin and zonula occludens-one (ZO-1) proteins and mRNA levels in cerebral tissue of streptozotocin-induced diabetic rats and the results were compared to insulin treated diabetic rats and vehicle injected control rats.
	rgd.mcw.edu /tools/references/references_view.cgi?id=633516 (170 words)

	Zonula Occludens Toxin Is a Powerful Mucosal Adjuvant for Intranasally Delivered Antigens -- Marinaro et al. 67 (3): ...
		Zonula Occludens Toxin Is a Powerful Mucosal Adjuvant for Intranasally Delivered Antigens -- Marinaro et al.
		Zonula occludens toxin (Zot) is produced by toxigenic strains of Vibrio cholerae and has the ability to reversibly alter intestinal
		Marinaro, M., Fasano, A., De Magistris, M. Zonula Occludens Toxin Acts as an Adjuvant through Different Mucosal Routes and Induces Protective Immune Responses.
	iai.asm.org /cgi/content/abstract/67/3/1287 (308 words)

	Lecture 2. Epithelium: Surface and Glandular
		fascia occludens: discontinuous strips of tight junctions between endothelial cells (except in brain)
		zonula occludens: tight junctions form continuous circumferential band
		zonula adherens = belt desmosomes: circumferential; beneath zonula occludens
	www.pitt.edu /~sshostak/biosci1450/hislec02.html (985 words)

	Effect of the biologically active fragment of zonula occludens toxin, @DG, on the intestinal paracellular transport and ...
		Effect of the biologically active fragment of zonula occludens toxin, @DG, on the intestinal paracellular transport and oral absorption of mannitol
		In general, absorption enhancers are agents that can modulate the paracellular permeability of drugs, thus, potentially increasing oral bioavailability.
		The objective of this study was to examine the effect of the active fragment of Zonula occludens toxin (Zot), @DG, on the transport of a paracellular marker, mannitol, using in vitro (Caco-2 cell monolayers) and in vivo (intraduodenal administration in rats) experimental methods.
	aaps.org /search/view.asp?ID=36536 (341 words)

	Human protein: Q9UDY2 - Tight junction protein ZO-2 (Zonula occludens 2 protein) (Zona occludens 2 protein) (Tight ...
		Human protein: Q9UDY2 - Tight junction protein ZO-2 (Zonula occludens 2 protein) (Zona occludens 2 protein) (Tight junction protein 2).
		Upstream genomic sequence for Tight junction protein 2 (zona occludens 2)
		Tight junction protein ZO-2 (Zonula occludens 2 protein) (Zona occludens 2 protein) (Tight junction protein 2).
	harvester.embl.de /harvester/Q9UD/Q9UDY2.htm (1103 words)

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