Atopik Dermatit ve D Vitamini
Özet
Atopik dermatit, dünya genelinde sık görülen, kronik ve kaşıntılı bir inflamatuar cilt hastalığıdır. Hastalığın patogenezinde cilt bariyerinin bozulması, immün disregülasyon ve Staphylococcus aureus gibi enfeksiyöz ajanların kolonizasyonu rol oynamaktadır. Son yıllarda, D vitamininin immün modülatör etkileri, T hücre yanıtlarını düzenlemesi ve katelisidin gibi antimikrobiyal peptitlerin sentezini uyararak cilt bariyerini güçlendirmesi nedeniyle atopik dermatit üzerindeki rolü yoğun şekilde araştırılmaktadır. Birçok gözlemsel çalışma ve meta-analiz, atopik dermatitli çocuklarda serum D vitamini (25(OH)D) düzeylerinin sağlıklı akranlarına göre daha düşük olduğunu ve düşük D vitamini seviyelerinin hastalık şiddetiyle (SCORAD indeksi) ters orantılı olduğunu göstermektedir. Oral D vitamini takviyesinin semptomları ve klinik skorları (EASI ve SCORAD) iyileştirdiğine dair umut verici çift-kör randomize kontrollü çalışmalar bulunmakla birlikte, çocukluk döneminde yüksek alımın besin alerjisi riskini artırabileceğini veya etkinliğin yetersiz olduğunu savunan çelişkili yayınlar da mevcuttur. Topikal D vitamini analoglarının ise keratinositlerde pro-alerjik sitokinleri (IL-4 ve TSLP) indükleyerek egzama alevlenmelerine yol açabileceği belirtilmekte ve rutin tedavide önerilmemektedir. Mevcut uluslararası kılavuzlar atopi gelişimini önlemek amacıyla profilaktik D vitamini kullanımını tavsiye etmemekte olup, optimal tedavi dozu ve süresinin belirlenmesi için daha fazla randomize kontrollü çalışmaya ihtiyaç duyulmaktadır.
Atopic dermatitis is a common, chronic, and pruritic inflammatory skin disease worldwide. Defective skin barrier, immune dysregulation, and colonization of infectious agents like Staphylococcus aureus play roles in its pathogenesis. Recently, the role of vitamin D in atopic dermatitis has been extensively investigated due to its immunomodulatory effects, regulation of T-cell responses, and enhancement of the skin barrier by stimulating antimicrobial peptides such as cathelicidin. Numerous observational studies and meta-analyses indicate that serum vitamin D (25(OH)D) levels are lower in children with atopic dermatitis compared to healthy controls, showing an inverse correlation with disease severity (SCORAD index). Although promising double-blind randomized controlled trials suggest that oral vitamin D supplementation improves symptoms and clinical scores (EASI and SCORAD), conflicting publications argue that high intake during infancy might increase food allergy risks or offer insufficient efficacy. Topical vitamin D analogs are not recommended for routine treatment, as they may trigger eczema exacerbations by inducing pro-allergic cytokines (IL-4 and TSLP) in keratinocytes. Current international guidelines do not recommend prophylactic vitamin D usage to prevent atopy development, highlighting the need for further randomized controlled trials to establish optimal therapeutic dosages and durations.
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