Binding, uptake, and release of nicotine by human gingival fibroblasts

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Journal of Periodontology; (USA)

DOI:https://doi.org/10.1902/jop.1991.62.2.147· OSTI ID:5761244

Hanes, P J; Schuster, G S; Lubas, S ^[1]

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1. Medical College of Georgia, Augusta (USA)

Previous studies of the effects of nicotine on fibroblasts have reported an altered morphology and attachment of fibroblasts to substrates and disturbances in protein synthesis and secretion. This altered functional and attachment response may be associated with changes in the cell membrane resulting from binding of the nicotine, or to disturbances in cell metabolism as a result of high intracellular levels of nicotine. The purpose of the present study, therefore, was to (1) determine whether gingival fibroblasts bound nicotine and if any binding observed was specific or non-specific in nature; (2) determine whether gingival fibroblasts internalized nicotine, and if so, at what rate; (3) determine whether gingival fibroblasts also released nicotine back into the extracellular environment; and (4) if gingival fibroblasts release nicotine intact or as a metabolite. Cultures of gingival fibroblasts were prepared from gingival connective tissue biopsies. Binding was evaluated at 4{degree}C using a mixture of {sup 3}H-nicotine and unlabeled nicotine. Specific binding was calculated as the difference between {sup 3}H-nicotine bound in the presence and absence of unlabeled nicotine. The cells bound 1.44 (+/- 0.42) pmols/10(6) cells in the presence of unlabeled nicotine and 1.66 (+/- 0.55) pmols/10(6) cells in the absence of unlabeled nicotine. The difference was not significant. Uptake of nicotine was measured at 37{degree}C after treating cells with {sup 3}H-nicotine for time periods up to 4 hours. Uptake in pmols/10(6) cells was 4.90 (+/- 0.34) at 15 minutes, 8.30 (+/- 0.75) at 30 minutes, 12.28 (+/- 2.62) at 1 hour and 26.31 (+/- 1.15) at 4 hours.

• OSTI ID: 5761244
• Journal Information: Journal of Periodontology; (USA), Vol. 62:2; ISSN 0022-3492
• Country of Publication: United States
• Language: English

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59 BASIC BIOLOGICAL SCIENCES
NICOTINE
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AMINES
ANIMAL CELLS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
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AZOLES
CONNECTIVE TISSUE CELLS
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HYDROGEN COMPOUNDS
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MAMMALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
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PRIMATES
PYRIDINES
PYRROLES
PYRROLIDINES
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550501* - Metabolism- Tracer Techniques