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Choline Acetyltransferase, Acetylcholinesterase, and Nicotinic Acetylcholine Receptors of Human Gingival and Esophageal Epithelia
V. Thuong Nguyen
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
L.L. Hall
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
G. Gallacher
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
A. Ndoye
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
D.L. Jolkovsky
Section of Periodontics, School of Dentistry, University of California-Los Angeles
R.J. Webber
Research & Diagnostic Antibodies, Richmond, CA, USA
R. Buchli
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
S.A. Grando
Department of Dermatology, University of California-Davis, UC Davis Medical Center, 4860 Y Street, 3400, Sacramento, CA 95817
A non-neuronal cholinergic system that includes neuronal-like nicotinic acetylcholine receptors (nAChRs) has recently been described in epithelial cells that line the skin and the upper respiratory tract. Since the use of nicotine-containing products is associated with morbidity in the upper digestive tract, and since nicotine may alter cellular functions directly via nAChRs, we sought to identify and characterize a non-neuronal cholinergic system in the gingival and esophageal epithelia. mRNA transcripts for a3,  5, 7, and β2 nAChR subunits, choline acetyltransferase, and the asymmetric and globular forms of acetylcholinesterase were amplified from gingival keratinocytes (KC) by means of polymerase chain-reactions. These proteins were visualized in the gingival and esophageal epithelia by means of specific antibodies. Variations in distribution and intensity of immunostaining were found, indicating that the repertoire of cholinergic enzymes and receptors expressed by the cells changes during epithelial maturation, and that an upward concentration gradient of free acetylcholine exists. Blocking of the nAChRs with mecamylamine resulted in reversible loss of cell-to-cell adhesion, and shrinking and rounding of cultured gingival KC. Activation of the receptors with acetylcholine or carbachol caused stretching and peripheral ruffling of the cytoplasmic aprons, and formation of new intercellular contacts. These results demonstrate that both the keratinizing epithelium of attached gingiva and the non-keratinizing epithelium lining the upper two-thirds of the esophageal mucosa possess a non-neuronal cholinergic system. The nAChRs expressed by these epithelia are coupled to regulation of cell adhesion and motility, and may provide a target for the deleterious effects of nicotine.
Key Words: gingival and esophageal epithelia • acetylcholine • carbachol • mecamylamine • cell-to-cell adhesion.
Journal of Dental Research, Vol. 79, No. 4,
939-949 (2000)
DOI: 10.1177/00220345000790040901
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