title: Periodontitis increases rheumatic factor serum levels and citrullinated proteins in gingival tissues and alter cytokine balance in arthritic rats.
abstract: 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-1β, IL-4, IL-6, IL-17 and TNF-α 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.
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Mônica G
authors.initials: MG
authors.lastname: Corrêa
authors.affiliation: Pediatric Rheumatology Unit, Pediatric Rheumatology Unit, Santa Casa de São Paulo, São Paulo, SP, Brazil.
authors.forename: Silvana B
authors.initials: SB
authors.lastname: Sacchetti
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Fernanda Vieira
authors.initials: FV
authors.lastname: Ribeiro
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Suzana Peres
authors.initials: SP
authors.lastname: Pimentel
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Renato Corrêa Viana
authors.initials: RC
authors.lastname: Casarin
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Fabiano Ribeiro
authors.initials: FR
authors.lastname: Cirano
authors.affiliation: Dental Research Division, School of Dentistry, Paulista University, São Paulo, São Paulo, Brazil.
authors.forename: Marcio Z
authors.initials: MZ
authors.lastname: Casati
mesh_terms: D000818:Animals; D016207:Cytokines / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005881:Gingiva / Q000378:metabolism*; D020381:Interleukin-17 / Q000378:metabolism; D015847:Interleukin-4 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D008297:Male; D010518:Periodontitis / Q000097:blood* / Q000150:complications*; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012217:Rheumatoid Factor / Q000097:blood*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D016207:Cytokines; D020381:Interleukin-17; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4; D012217:Rheumatoid Factor