The role of potassium channels in the endothelial dysfunction induced by periodontitis
J. appl. oral sci
;
26: e20180048, 2018. graf
Article
in English
| LILACS, BBO
| ID: biblio-954519
ABSTRACT
Abstract Objective:
Periodontitis is associated with endothelial dysfunction, which is clinically characterized by a reduction in endothelium-dependent relaxation. However, we have previously shown that impairment in endothelium-dependent relaxation is transient. Therefore, we evaluated which mediators are involved in endothelium-dependent relaxation recovery. Material andmethods:
Rats were subjected to ligature-induced experimental periodontitis. Twenty-one days after the procedure, the animals were prepared for blood pressure recording, and the responses to acetylcholine or sodium nitroprusside were obtained before and 30 minutes after injection of a nitric oxide synthase inhibitor (L-NAME), cyclooxygenase inhibitor (Indomethacin, SC-550 and NS- 398), or calcium-dependent potassium channel blockers (apamin plus TRAM- 34). The maxilla and mandible were removed for bone loss analysis. Blood and gingivae were obtained for C-reactive protein (CRP) and myeloperoxidase (MPO) measurement, respectively.Results:
Experimental periodontitis induces bone loss and an increase in the gingival MPO and plasmatic CRP. Periodontitis also reduced endothelium-dependent vasodilation, a hallmark of endothelial dysfunction, 14 days after the procedure. However, the response was restored at day 21. We found that endothelium-dependent vasodilation at day 21 in ligature animals was mediated, at least in part, by the activation of endothelial calcium-activated potassium channels.Conclusions:
Periodontitis induces impairment in endothelial-dependent relaxation; this impairment recovers, even in the presence of periodontitis. The recovery is mediated by the activation of endothelial calcium-activated potassium channels in ligature animals. Although important for maintenance of vascular homeostasis, this effect could mask the lack of NO, which has other beneficial properties.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Periodontitis
/
Vasodilation
/
Potassium Channels
/
Prostaglandin-Endoperoxide Synthases
/
Nitric Oxide
Limits:
Animals
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2018
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual de Ponta Grossa/BR
/
Universidade Federal de Santa Catarina/BR
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