NO-cGMP signaling molecules in cells of the rat molar dentin-pulp complex.
By the formation of cyclic guanosine 3',5'-monophosphate (cGMP), nitric oxide (NO)-sensitive enzyme-soluble guanylate cyclase (sGC) plays a receptor role for NO within the NO-cGMP signaling cascade, which is involved in vasodilatation and neurotransmission. The hypothesis that NO-cGMP signaling molecules modulate cells of the dentin-pulp complex was investigated in rat molars by histochemical, immunohistochemical, immuno-ultrastructural, and organ bath techniques. NO synthase (NOS) I-III, the sGC alpha(2)-subunit/beta(1)-subunit, and cGMP were detected in odontoblasts and blood vessels. NOS I, sGC alpha(2), and cGMP were identified in nerve fibers. Treatment of rat molars with the NO donor NONOate (10(-5) M) increased cGMP staining intensities in blood vessels and odontoblasts, while NO synthase inhibitor L-NAME (10(-4) M) attenuated intensity of the reaction products for cGMP, suggesting an effect of endogenous NO on sGC. These correlations of patterns and alterations of cGMP staining intensities after treatment with the NO donor or NO inhibitor might represent an NO-sGC-cGMP signaling-dependent modulation of odontoblasts, blood vessels, and nerve fibers in the dentin-pulp complex.
Department of Operative and Preventive Dentistry and Endodontics, Heinrich-Heine-University, Moorenstrasse 5, 40225 Düsseldorf, Germany. yueksel.korkmaz@uni-duesseldorf.de
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Korkmaz
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Baumann
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Steinritz
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Schröder
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Behrends
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Addicks
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Schneider
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Raab
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Bloch
D000818:Animals; D006152:Cyclic GMP / Q000378:metabolism*; D003782:Dental Pulp / Q000201:enzymology* / Q000648:ultrastructure; D003804:Dentin / Q000201:enzymology* / Q000648:ultrastructure; D006162:Guanylate Cyclase / Q000378:metabolism; D007150:Immunohistochemistry; D008297:Male; D008963:Molar / Q000166:cytology / Q000201:enzymology / Q000648:ultrastructure; D009569:Nitric Oxide / Q000378:metabolism*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D009804:Odontoblasts / Q000201:enzymology* / Q000648:ultrastructure; D051381:Rats; D017208:Rats, Wistar; D015398:Signal Transduction / Q000502:physiology; D014018:Tissue Distribution
D009569:Nitric Oxide; D019001:Nitric Oxide Synthase; D006162:Guanylate Cyclase; D006152:Cyclic GMP