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2017 ; 12
(3
): e0174442
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Periodontitis increases rheumatic factor serum levels and citrullinated proteins
in gingival tissues and alter cytokine balance in arthritic rats
#MMPMID28358812
PLoS One
2017[]; 12
(3
): e0174442
PMID28358812
show ga
This study investigated some immunological features by experimental periodontitis
(EP) and rheumatoid arthritis (RA) disease interact in destructive processes in
arthritic rats. Rats were assigned to the following groups: EP +RA; RA; EP; and
Negative Control. RA was induced by immunizations with type-II collagen and a
local immunization with Complete Freund's adjuvant in the paw. Periodontitis was
induced by ligating the right first molars. The serum level of rheumatoid factor
(RF) and anti-citrullinated protein antibody (ACCPA) were measured before the
induction of EP (T1) and at 28 days after (T2) by ELISA assay. ACCPA levels were
also measured in the gingival tissue at T2. The specimens were processed for
morphometric analysis of bone loss, and the gingival tissue surrounding the first
molar was collected for the quantification of interleukin IL-1?, IL-4, IL-6,
IL-17 and TNF-? using a Luminex/MAGpix assay. Paw edema was analyzed using a
plethysmometer. Periodontitis increased the RF and ACCPA levels in the serum and
in the gingival tissue, respectively. Besides, the level of paw swelling was
increased by EP and remained in progress until the end of the experiment, when EP
was associated with RA. Greater values of IL-17 were observed only when RA was
present, in spite of PE. It can be concluded that periodontitis increases
rheumatic factor serum levels and citrullinated proteins level in gingival
tissues and alter cytokine balance in arthritic rats; at the same time, arthritis
increases periodontal destruction, confirming the bidirectional interaction
between diseases.