The data distributions of salivary immunoglobulin levels were skewed, therefore non-parametric MannWhitney U tests were applied. were detected in the Crohns disease group compared to the controls. SalivaryP. gingivaliscarriage was lower in the Crohns disease group in comparison to the controls (p= 0.024). In conclusion, salivary IgA antibody responses againstP. gingivalisand IgG antibody responses againstP. intermediahave independent associations with Crohns disease. Keywords:Crohns disease, immune response, plasma cells == 1. Introduction == Crohns disease is an inflammatory bowel disease with chronic and relapsing-remitting character. Crohns disease has multifactorial etiology, and the cellular and humoral GLPG2451 immune responses play significant roles in their pathogenesis [1]. Crohns disease can be observed at any part of the gastrointestinal tract, including the oral cavity [2]. Early studies identified three common immune response disruptions in Crohns disease patients; excessive T-cell activation, decreased T-cell suppression, and elevated B-cell activation [3]. In line with these findings, recent studies also demonstrated increased mucosal cells expression of interleukin (IL)-23/tumor necrosis factor (TNF)- and activated Th17/Th1 cascade in Crohns GLPG2451 disease [2]. Yet, the interest in the contribution of B cells and their immunoglobulins to Crohns disease pathogenesis accelerated recently. Secretory immunoglobulins maintain the mutual symbiotic relationship between microorganisms and the host. An elevated number of immunoglobulin (Ig) secreting cells [3] and an increased number of IgA- and IgG-bound commensal bacteria [4] were observed in Crohns disease patients. Indeed, increased serum IgA and IgG levels in Crohns disease were related to disease severity [5]. Yet, the elevated immunoglobulin levels in Crohns disease cannot be fully explained with the gastrointestinal mucosal barrier dysfunctions or acute inflammatory flares [6]. Shared similarities in the ethiopathogenesis of periodontitis and Crohns disease include defective neutrophil chemotaxis, impaired TNF- expression, and atypical Th1 cell response [7]. Moreover, the intraoral abundance of some periodontitis-associated bacteria, genusPrevotellaandVeillonella, increase in Crohns disease patients [8]. In the present study, we hypothesized that the shifts in immunoglobulin response in Crohns disease patients reflect in salivary levels of species-specific IgA and IgG antibody levels. Therefore, the aim of this study was to analyze the salivary levels of IgA and IgG antibodies againstPorphyromonas gingivalis,Tannerella forsythia,Aggregatibacter actinomycetemcomitans, andPrevotella intermediain Crohns disease patients. == 2. Results == Detailed descriptions of the demographic data were published previously [9]. Briefly, the percentage of males was 23.4 % in the Crohns disease group and 29.3% in the control group (p= 0.629), the mean age was (46.4 13.9) in the Crohns disease group and (47.4 13.2) in the control group (p= 0.734), and the percentage of the periodontally healthy individuals was 25% in the Crohns disease group and 36.6% in the control group (p= 0.021). No difference was observed in stimulated salivary flow levels between Crohns disease (mean 1.42 0.72 mL/min) and control (1.59 0.9 mL/min) groups (p= 0.313). According to the short CDAI score, 53.2% of the GLPG2451 Crohns disease patients were in remission (short CDAI < 150 points), 31.9% had mild disease (short CDAI Rabbit polyclonal to ACADM 150219 points), 14.9% had moderate disease (short CDAI 220450 points), and none had severe disease (CDAI > 450 points). Salivary carriage ofP. gingivalis,T. forsythia,A. actinomycetemcomitans, andP. intermediaare given inTable 1. A higher percentage of individuals withP. gingivalispositivity was observed in the control group in comparison to Crohns disease group (p= 0.040). No other significant difference was observed in the salivary carriage ofT. forsythia,A. actinomycetemcomitans, andP. intermedia. == Table 1. == Salivary carriage ofP. gingivalis(Pg),T. forsythia(Tf),A. actinomycetemcomitans(Aa), orP. intermedia(Pi) in Crohns disease and control groups. p-values derived from Chi-Square tests. Salivary levels of total IgA, IgG1, IgG2, IgG3, IgG4, and IgM antibody levels are given inTable 2. Salivary IgG2 (p= 0.011) and IgG3 (p= 0.006) antibody levels were found to be higher in Crohns disease group in comparison to the controls. == Table 2. == Salivary levels of IgA, IgG1, IgG2, IgG3, GLPG2451 IgG4, and IgM antibodies in Crohns disease and GLPG2451 control groups. Data are presented as medians and interquartile ranges (in parenthesis).p-values derive from MannWhitney U test. Salivary IgA and IgG antibody levels againstP. gingivalis, T. forsythia, A. actinomycetemcomitans, andP. intermediaare given inTable 3. SalivaryP. gingivalisIgA (p< 0.001),A. actinomycetemcomitansIgG (p= 0.001) andP. intermediaIgG (p< 0.001) antibody levels were higher in the Crohns disease group compared to the controls. == Table 3. == Salivary IgA and IgG antibody levels againstP. gingivalis (Pg), T. forsythia (Tf), A. actinomycetemcomitans (Aa), andP. intermedia (Pi)in Crohns disease and control groups..