Int Poster J Dent Oral Med 2010, Vol 12 No 2, Poster 488
Interleukin-4 promoter polymorphisms in patients with aggressive or chronic periodontitis
PD Dr. med. dent. Stefan Reichert, Dr. med. dent. Jana Klapproth, Dr. med. dent. Uta Zimmermann, Prof. Dr. Hans-Günter Schaller, Dr. rer. nat. Susanne Schulz,
Martin-Luther-University Halle-Wittenberg, Dep. of Operative Dentistry and Periodontology, Halle (Saale), Germany
Dr. rer. nat. Helmut KG.Machulla,
Martin-Luther-University Halle-Wittenberg, Dep. Ghatt, Interbranch HLA Laborartory, Halle (Saale), Germany
Private Dental Department, Halle (Saale), Germany
PD Dr. med. dent. Jamal M. Stein,
RWTH Aachen, Dep. of Operative Dentistry, Periodontology and Preventive Dentistry, Aachen, Germany
Dr. rer. nat. Christiane Gläser,
Martin-Luther-University Halle-Wittenberg, Institute of Human Genetics and Medical Biology, Halle (Saale), Germany
November 4th-7th, 2009
In periodontitis susceptibility individuals, disease progression involves a predominantly Th2-like immune response (1). IL-4 stimulates a Th2-type of immune response while inhibits Th1 cells (2,3). Moreover, IL-4 limits the persistence of macrophages in periodontitis lesions and down regulates CD14 receptor, one of the key receptors for lipopolysaccharides (4).
Promoter polymorphisms of the interleukin-4 gene have been associated with altered IL-4 production (5-7). Thus, they could be indicative for periodontitis. Therefore, the aim of this study was to determine allele- genotype- and haplotype- frequencies of IL-4 SNPs at positions -1098T/G, -590C/T and -33C/T in patients with generalized aggressive (AP) or generalized chronic periodontitis (CP) in comparison to periodontitis free controls.Calculation of adjusted Odds ratios (OR) were carried out with respect to established cofactors for periodontitis such as age, gender, smoking, and plaque index.
Material and Methods
121 patients with sever periodontitis (attachment loss >4mm in 80% of the teeth; CP: n=54, mean age 49,3 ±10.0 years; AP: n=67, mean age 41 ±9.9 years) and 81 individuals without periodontitis (Controls:mean age 46,9 ±10.7 years) were included.
Proof of IL-4 promoter polymorphisms
IL-4 SNPs were analyzed by PCR-SSP (CTS-Kit, Heidelberg, Germany). Distributions of single alleles, genotypes, and haplotypes were calculated by Chi2-Test with Yates correction or Fisher's exact test. Risk factor analyses were carried out by logistic regression under consideration of established cofactors for periodontitis such as age, gender, smoking status, and plaque index.
The mutant allele G at position -1098 was significantly increased among both patient groups. The mutant alleles -590 T und -33 T were more frequently proven only among patients with AP (Fig. 1)
The mutant genotype -1098 TG was significantly increased among both patient groups (Fig. 2). Moreover, the mutant genotypes -590 CT and -33 CT were likewise significantly increased (linkage disequilibrium!) among patients with AP (Fig. 3 and 4).
Among both, patients with AP and CP the mutant haplotype -1098, -590, -33 GCC was significantly increased. Moreover, the haplotype -1098, -590, -33 TTT was significantly more proven only among patients with AP (Fig. 5).
Risik analysis with binary logistical regression
The haplotype -1098,-590,-33 GCC increased the adjusted OR for AP and CP. Mutations (C>T) at positions -590 and -33 were indicative only for AP (Fig. 6).
Genotypes and haplotypes who expressed the mutant allele G at position -1098 were indicative for both, CP and AP. Polymorphisms (C>T) at positions -590 and -33 (high interleukin-4 producer genotypes) increased the Odds ratio for an AP. In a further study it would be useful to investigate the IL-4 production in association to IL-4 polymorphisms.
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AP = aggressive periodontitis
CP = chronic periodontitis
IL = interleukin
Th = T helper cells
PCR-SSP = polymerase chain reaction with sequence specific primers
This Poster was submitted by PD Dr. med. dent. Stefan Reichert.
PD Dr. med. dent. Stefan Reichert
Dep. für Zahnerhaltungskunde und Parodontologie
Große Steinstrasse 19
06108 Halle (Saale), Germany