A variety of indirect data exist which, in aggregate, suggest that exocytosis can alter tight junction structure and/or permeability. These experiments are designed to assess the feasibility of utilizing a homogenous epithelia monolayer derived from a human intestinal cell line to study the effects of exocytosis on tight junction structure and permeability. To accomplish this goal we will utilize the 18N2 clone of the HT29 cell line which was derived from a human colonic carcinoma. HT 29-18N2 cells differentiate as goblet cells, grow as monolayers on coverslips, and respond to cholinergic stimulation with exocytosis of mucin granule content. We will first attempt to identify conditions under which HT2918N2 cells can be grown on permeable supports as confluent monolayers from which electrophysical and flux data can be obtained. Using physiological techniques we will then ascertain if stimulated exocytosis perturbs tight junction barrier function. Using electron microscopy and freeze fracture techniques we will define the effects which exocytosis exert on tight junction structure. Lastly we will define and inter-relate physiological and structural events which occur as monolayers recover from stimulated exocytosis. These studies may yield insights into how local events such as exocytosis influence tight junction barrier function. These studies may also define methods whereby electrophysiological studies can be performed on homogeneous, flat, easily manipulated monolayers composed entirely of one of the major subtypes of cells in the intestinal epithelium - the goblet cell.

Project Start
Project End
Budget Start
Budget End
Support Year
7
Fiscal Year
1990
Total Cost
Indirect Cost
Name
Harvard University
Department
Type
DUNS #
082359691
City
Boston
State
MA
Country
United States
Zip Code
02115
McSweeney, Maireade E; Kerr, Jessica; Amirault, Janine et al. (2018) Preoperative Evaluation Is Not Predictive of Transpyloric Feeding Conversion in Gastrostomy-dependent Pediatric Patients. J Pediatr Gastroenterol Nutr 66:887-892
Thiagarajah, Jay R; Kamin, Daniel S; Acra, Sari et al. (2018) Advances in Evaluation of Chronic Diarrhea in Infants. Gastroenterology 154:2045-2059.e6
Masuyer, Geoffrey; Zhang, Sicai; Barkho, Sulyman et al. (2018) Structural characterisation of the catalytic domain of botulinum neurotoxin X - high activity and unique substrate specificity. Sci Rep 8:4518
Xenakis, Jason J; Howard, Emily D; Smith, Kalmia M et al. (2018) Resident intestinal eosinophils constitutively express antigen presentation markers and include two phenotypically distinct subsets of eosinophils. Immunology 154:298-308
Desai, Anal; Alves-Bezerra, Michele; Li, Yingxia et al. (2018) Regulation of fatty acid trafficking in liver by thioesterase superfamily member 1. J Lipid Res 59:368-379
Richmond, Camilla A; Rickner, Hannah; Shah, Manasvi S et al. (2018) JAK/STAT-1 Signaling Is Required for Reserve Intestinal Stem Cell Activation during Intestinal Regeneration Following Acute Inflammation. Stem Cell Reports 10:17-26
Rankin, Carl Robert; Theodorou, Evangelos; Man Law, Ivy Ka et al. (2018) Identification of novel mRNAs and lncRNAs associated with mouse experimental colitis and human inflammatory bowel disease. Am J Physiol Gastrointest Liver Physiol 315:G722-G733
Garcia-Castillo, Maria Daniela; Lencer, Wayne I; Chinnapen, Daniel J-F (2018) Transcytosis Assay for Transport of Glycosphingolipids across MDCK-II Cells. Bio Protoc 8:
Richardson, Gavin David; Sage, Andrew; Bennaceur, Karim et al. (2018) Telomerase Mediates Lymphocyte Proliferation but Not the Atherosclerosis-Suppressive Potential of Regulatory T-Cells. Arterioscler Thromb Vasc Biol 38:1283-1296
Hong, Shangyu; Song, Wei; Zushin, Peter-James H et al. (2018) Phosphorylation of Beta-3 adrenergic receptor at serine 247 by ERK MAP kinase drives lipolysis in obese adipocytes. Mol Metab 12:25-38

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