Ağrının Sirkadiyen Kontrolü
Özet
Sağlık kurumlarına başvuruların en sık nedeni olan ağrının şiddeti ve eşiği, sirkadiyen ritim ile melatonine bağlı olarak gündüz ve gece döngüsünde değişiklik göstermektedir. Dokunun hasar görmesiyle başlayan ve kortekste algılanan nosisepsiyon süreci; transdüksiyon, transmisyon, modülasyon ve persepsiyon olmak üzere dört aşamada gerçekleşirken, bu iletim yapılarında ağrı kontrolünü sağlayan MT1 ve MT2 melatonin reseptörleri yer almaktadır. Pineal bez tarafından karanlıkta sentezi artan lipofilik melatonin hormonu, suprakiazmatik nükleustaki reseptörleri aracılığıyla sirkadiyen ritmi düzenlerken, fibromiyalji, migren ve nöropatik ağrılarda belirgin bir analjezik etki sunmaktadır. Hücre çekirdeğindeki BMAL1, CLOCK, PER ve CRY gibi genlerin oluşturduğu moleküler feed-back mekanizmaları, merkezi sinir sistemindeki glial hücreler ile bağışıklık sistemine ait inflamatuar sitokinlerin (IL-2, TNF-α, IL-6) sirkadiyen ritme uygun şekilde salınmasını kontrol etmektedir. Son çalışmalar, sirkadiyen ritim bozuklukları ile nöroinflamatuar süreçlerin ağrıyı doğrudan tetiklediğini göstererek, kronik ağrı yönetiminde fototerapi ile kronoterapinin klinik olarak kullanılabilirliğini ve geliştirilmesini desteklemektedir.
Pain, the most common reason for healthcare visits, varies in intensity and threshold throughout the day and night cycle depending on circadian rhythms and melatonin. The nociception process, which begins with tissue damage and is perceived in the cortex, occurs in four stages—transduction, transmission, modulation, and perception—and MT1 and MT2 melatonin receptors that provide pain control are located within these transmission structures. The lipophilic hormone melatonin, synthesized by the pineal gland during darkness, regulates the circadian rhythm via receptors in the suprachiasmatic nucleus, offering a distinct analgesic effect in fibromyalgia, migraine, and neuropathic pain. Molecular feed-back mechanisms consisting of genes like BMAL1, CLOCK, PER, and CRY in the cell nucleus control the secretion of inflammatory cytokines (IL-2, TNF-α, IL-6) and glial cells in the central nervous system in accordance with the circadian rhythm. Recent studies indicate that circadian disruptions and neuroinflammatory processes directly trigger pain, supporting the clinical usability and development of phototherapy and chronotherapy in chronic pain management.
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