Expression of gene proteins, interleukins and β-defensin in cleft-affected tissue PAPER ID 22090 Iveta Jankovska, D.D.S., Department of Orthodontics, Riga.

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Expression of gene proteins, interleukins and β-defensin in cleft-affected tissue PAPER ID 22090 Iveta Jankovska, D.D.S., Department of Orthodontics, Riga Stradins University Mara Pilmane, Prof., Dr. hab. med., Department of Morphology, Riga Stradins University Ilze Akota, Prof., Department of Oral and Maxillofacial Surgery, Rigas Stradins University Introduction Results The most common craniofacial malformation worldwide in the newborn infants is the orofacial cleft, consisting of cleft lip with or without cleft palate and isolated cleft palate. In Latvia cleft lip and palate occur in 1 of 700 - 800 live births what is average occurrence in Europe population. Fusion, migration and elevation of primary palate takes place at about the fifth or sixth week of embryonic life, whereas elevation and fusion of the secondary palate occurs at about six to eight weeks by a highly regulated process of mesenchymal proliferation and epithelial breakdown in three facial prominences: maxillary, the lateral nasal and medial nasal. Clefts of the palate can arise due to failure at any of several steps including palatal shelves elevation, migration, or fusion. This complicated process in craniofacial region are strongly caused, controlled and regulated by multiple factors, such as growth factors, cytokines, neuropeptides, some genes and gene proteins. Results showed prominent expression of IL10 (mean value 47.28 ± 4.26 in visual field) followed by IL7 (35.62 ± 11.18) in cartilage of patients, but slightly less pronounced expression of IL8 (30.14 ± 8.74), IL6 (22.52 ± 10.88) and IL4 (14.81 ± 6.94). The expression of β-defensin 2 was prominent (34.52 ± 11.79) and similar to expression of IL7 in tissue samples of cartilage. MSX1, PAX9, RYK and IRF6 (17.67 ± 5.94; 16.14 ± 5.52; 16.57 ± 5.22 and 11.86 ± 4.21) in cartilage was less pronounced than interleukins and β-defensin 2. MSX1 (12.44 ± 3.34), PAX9 (6.89 ± 2.14), RYK (11.0 ± 5.92) and IRF6 (9.1 ± 4.76) gene proteins expression in bone showed mostly rare occurrence of positive structures.  Aim of the project The aim of the study was to investigate cleft – affected tissues in children with cleft lip and palate in order to detect appearance frequency of β-defensin 2, interleukins (IL4, IL6, IL7, IL8, IL10) and gene proteins (MSX1, RYK, PAX9, IRF6).  Materials and methods Study group included 10 patients with cleft lip and palate with mean age 8.6 ± 1.03 years. Biopsy samples from cartilage and bone were taken during nose surgery. Standard biotine and streptovidine immunohistochemical method was used for the detection of gene proteins, β-defensin 2 and interleukins (MSX1 (orb18823, 1:100, Biorbyt Ltd., UK), IRF6 (ab167403, 1:100, Abcam, UK), PAX9 (orb120466, 1:100, Biorbyt Ltd., UK), RYK (orb38371, 1:100, Biorbyt Ltd., UK), β-defensin 2 (af27580, 1:100, RD Systems, UK), and interleukins IL4 (orb10908, 1:100, Biorbyt Ltd., UK), IL6 (sc130326, 1:50, Santa Cruz Biotechnology, USA), IL7 (orb48420, 1:100, Biorbyt Ltd., UK), IL8 (sc1269, 1:50, Santa Cruz Biotechnology Inc., USA), and IL10 (ab34843, 1:400, Abcam, UK). The data were analyzed using descriptive and analytical statistical methods. Counting of positive cells per 3 visual fields and calculation of mean value and standard deviation performed semi-quantative analysis of the slides. Table 1. Mean numbers and standard deviations of immunoreactive cells in cartilage of patients with cleft lip and palate. Table 2. Mean numbers and standard deviations of immunoreactive cells in bone of patients with cleft lip and palate. Fig. 1. Microphotograph of β-defensin 2 immunoreactive cells in cartilage of cleft lip and palate patient, IMH, x200. Fig. 2. Microphotograph of PAX9 immunoreactive cells in bone of cleft lip and palate patient, IMH, x200. Fig.4. Microphotograph of IL4 positive structures in cartilage of cleft lip and palate patient, IMH, x100. Fig. 3. Microphotograph of IL10 containing cells in cartilage of cleft lip and palate patient, IMH, x100. Conclusions The most prominent was the expression of IL10 in tissue samples of cartilage with numerous and/or plenty of positive structures in the visual field and significant expression of IL7 and β-defensin 2, but slightly less pronounced expression of IL4, IL6 and IL8. Significant expression of IL10 and β-defensin 2 and IL7 in cartilage proves the prominent immune response in cleft affected hard tissue. Mostly indistinct MSX1, PAX9, RYK and IRF6 gene proteins expression in bone might be an indicator of not complete cellular differentiation, proliferation and migration events in cleft disordered hard tissue.