Diş Çürüğünün Potansiyel Biyobelirteçleri
Özet
Diş çürükleri, dünya genelinde yaygın olarak görülen, bakteriyel enfeksiyonların yanı sıra konakçı ve diyet faktörlerinden de etkilenen inflamatuvar bir hastalıktır. Son dönemdeki araştırmalar, ağız ortamının birincil savunma sistemi olan tükürükteki potansiyel biyobelirteçler ile diş çürükleri arasındaki ilişkiyi incelemeye odaklanmıştır. Tükürük; tamponlama, mekanik durulama ve barındırdığı antimikrobiyal proteinler sayesinde diş yüzeylerini korur. İmmünoglobulin A (IgA), epitel hücrelerine bakteriyel yapışmayı önleyerek mikrobiyal istilaya karşı ilk savunma hattını oluştururken; müsinler (MUC5B ve MUC7) viskoelastik bir tabaka ile mikroorganizmaları hapsedip demineralizasyon sürecini kontrol eder. Ayrıca küçük katyonik proteinler olan defensinler, histatinler ve demir bağlayıcı laktoferrin ile gram-pozitif bakterileri öldüren lizozim gibi bileşenler ağız içi florayı düzenlemede sinerjik roller üstlenir. Dentin çürüğü sürecinde ise organik matriksin bozulmasında matriks metalloproteinazlar (MMP) ve bunların asit reaksiyonları kritik rol oynar; bu enzimlerin kimyasal inhibitörlerle durdurulması çürük ilerlemesini geciktirebilir. Tükürüğün peroksidaz sistemi ile antioksidan ve oksidan kapasiteleri (TAS, TOS, MDA) ise serbest radikallerin yol açtığı oksidatif strese karşı savunma mekanizmalarını şekillendirir. Son olarak tükürükteki bakır, çinko gibi eser elementler ile lipopolisakkaritleri nötralize eden CD14 ko-reseptörleri, diş çürüğünün patogenezinde ve immün yanıtın değerlendirilmesinde önemli tanısal biyobelirteçler olarak öne çıkmaktadır.
Dental caries is a widespread inflammatory disease that affects a large portion of the global population, developing as a result of bacterial infection and being heavily influenced by host and dietary factors. Recent research focuses on identifying salivary biomarkers to understand risk factors and oral defense mechanisms, as saliva serves as the primary system protecting exposed tooth surfaces through mechanical rinsing, buffering, and antimicrobial proteins. Immunoglobulin A (IgA) acts as the first line of defense by inhibiting bacterial attachment to epithelial cells, while mucins (MUC5b and MUC7) trap microorganisms and regulate demineralization and remineralization processes. Small cationic peptides such as defensins and histatins, along with iron-binding lactoferrin and lysozyme, exhibit broad-spectrum antimicrobial properties that control the oral microflora. In dentin caries, matrix metalloproteinases (MMPs) are responsible for degrading the organic matrix under acidic conditions, and their inhibition presents a potential therapeutic approach to arrest lesion progression. Furthermore, the salivary peroxidase system and oxidative stress markers, including total antioxidant capacity (TAS) and malondialdehyde (MDA), represent compensatory defense responses against free-radical damage. Finally, salivary trace elements like copper and zinc, alongside sCD14 co-receptors that neutralize bacterial components, serve as significant indicators in assessing dental caries susceptibility and pathogenesis.
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