Adenosine receptor stimulation by polynucleotides (PDRN) reduces inflammation in experimental periodontitis.
J Clin Periodontol 2012;
40:26-32. [PMID:
23033941 DOI:
10.1111/jcpe.12010]
[Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2012] [Indexed: 11/29/2022]
Abstract
AIM
Adenosine receptors modulate inflammation in periodontal tissues. No data are available regarding the effects of adenosine A(2A) receptor stimulation in experimental periodontitis (EPD). The aim of this study was to investigate the effects of polynucleotides (also known as polydeoxyribonucleotide, PDRN), a ligand of A(2A) receptor, in EPD in rats.
MATERIALS AND METHODS
EPD was induced ligating the cervix of the lower left first molar. Sham-EPD had no ligature. After 7 days, EPD animals were randomized to a daily treatment with vehicle gel or 0.75% PDRN gel or PDRN gel with a specific A(2A) antagonist (DMPX). Treatments lasted 7 days. Animals were then euthanized and the periodontium and surrounding gingival tissue were excised for histological evaluation and bio-molecular analysis of inflammatory (p-JNK, p-ERK, TNF-α, IL-6, HMGB-1) and apoptotic proteins (BAX and Bcl-2).
RESULTS
Vehicle-treated EPD rats showed severe inflammatory infiltrate in both gingival and periodontal ligament, as well as an enhanced expression of p-JNK, p-ERK, TNF-α, IL-6, HMGB-1 and BAX and a reduction in Bcl-2. PDRN gel restored the histological features, blunted inflammatory and apoptotic proteins expression and preserved Bcl-2 expression. DMPX abrogated PDRN positive effects.
CONCLUSION
Our data suggest that adenosine receptor stimulation by PDRN might represent a new therapeutic strategy for periodontitis.
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