Paul Nettesheim

Learn More
The goal of our studies was to establish procedures for subculturing normal human tracheobronchial epithelial (NHTBE) cells without compromising their ability to differentiate into mucous and ciliated cells (i.e., differentiation competence) and to study the regulation of airway secretions by epidermal growth factor (EGF) and retinoic acid (RA). Primary(More)
This study tested the hypothesis that gene expression profiling can reveal indicators of subtle injury to the liver induced by a low dose of a substance that does not cause overt toxicity as defined by conventional criteria of toxicology (e.g., abnormal clinical chemistry and histopathology). For the purpose of this study we defined this low dose as(More)
The purpose of these studies was to define culture conditions that support growth and differentiation of normal epithelial cells obtained from hamster tracheas. Epithelial cells from tracheas of adult hamsters were collected using enzymatic procedures and cultured under various conditions. The medium used consisted of a 1:1 mixture of medium 199 and(More)
In vitro culture conditions enabling rat tracheal epithelial (RTE) cells to differentiate to mucociliary, mucous, or squamous phenotypes are described. Medium composition for rapid cell growth to confluence in membrane insert cultures was determined, and the effects of major modifiers of differentiation were tested. Retinoic acid (RA), collagen gel(More)
Specific-pathogen-free female F344 rats were exposed by inhalation to what was considered a maximal tolerated dose of cigarette smoke. Total pulmonary deposition of smoke particulates from a single cigarette was 0.25 mg in young rats. Rats were exposed to smoke from 7 cigarettes/day for as long as 2.5 years, at which time 30% of the rats remained alive.(More)
The cellular pathway of ciliated cell differentiation and its regulation is poorly defined. To begin to understand the process of ciliated cell differentiation, we sought to identify factors regulating ciliated cell development in vitro. Rat tracheal epithelial (RTE) cells were cultured on collagen gel-coated membranes at an air-liquid interface in hormone-(More)
To investigate which retinoid receptors are critical in the regulation by all-trans-retinoic acid (RA) of the mucin genes MUC2, MUC5AC and MUC5B in cultured normal human tracheobronchial epithelial (NHTBE) cells, we used pan-RAR-, pan-RXR- and RAR- isotype (alpha, beta and gamma)-selective agonists and RARalpha- and RARgamma-selective antagonists (RAR is RA(More)
Glutathione plays an essential role in protecting the pulmonary system from toxic insults. gamma-Glutamyl transpeptidase-related enzyme (GGT-rel) is a novel protein capable of cleaving the gamma-glutamyl peptide bond of glutathione and of converting leukotriene C4 to leukotriene D4. A rat homologue of GGT-rel was identified and was found to be highly(More)
The objective of this study was to examine the differentiation potential of basal cells purified from rabbit tracheas by means of centrifugal elutriation. Cell suspensions containing between 83 and 94% basal cells were inoculated into tracheal grafts denuded of their own epithelium and transplanted to the backs of nude mice. Within 1 week after inoculation,(More)