Oreksijenik ve Anoreksijenik Peptitlerin Açlık-Tokluk Mekanizmasına Etkisi
Özet
Açlık ve tokluk mekanizmaları üzerinde zıt etkilere sahip olan oreksijenik (besin alımını uyaran) ve anoreksijenik (besin alımını durduran) peptitler, vücudun enerji homeostazının sürdürülmesinde kritik roller oynamaktadır. İştah regülasyonu; hipotalamus, beyin sapı ve gastrointestinal sistemden gelen sinyallerin entegre bir şekilde çalışmasıyla yürütülen son derece karmaşık bir süreçtir. Arkuat çekirdekte yer alan AgRP/NPY nöronları oreksijenik yolakları tetiklerken, POMC/CART nöronları besin alımını baskılayan anoreksijenik sinyalleri aktive eder. Mideden salgılanan ghrelin en güçlü iştah artırıcı hormonlardan biriyken; yağ dokudan salgılanan leptin ile pankreatik insülin, uzun vadeli enerji depolarını beyne ileterek beslenmeyi inhibe eder. Ayrıca CCK, PYY ve GLP-1 gibi gastrointestinal peptitler, kısa süreli açlık ve tokluk dengesini akut olarak modüle ederek öğünlerin sonlandırılmasına katkı sağlar. Bu peptitlerin aktiviteleri ile nöronal devreler arasındaki hassas denge, vücut ağırlığının korunması ve metabolik homeostaz için temel teşkil eder.
Orexigenic (appetite-stimulating) and anorexigenic (appetite-suppressing) peptides, which exert opposing effects on hunger and satiety mechanisms, play pivotal roles in maintaining energy homeostasis. Appetite regulation is a highly complex process integrated through coordinated signals from the hypothalamus, brainstem, and gastrointestinal tract. Within the arcuate nucleus, AgRP/NPY neurons trigger orexigenic pathways, whereas POMC/CART neurons activate anorexigenic signals to suppress food intake. While stomach-derived ghrelin acts as one of the most potent appetite stimulants, adipose-derived leptin and pancreatic insulin signal long-term energy stores to the brain, effectively inhibiting feeding behavior. Additionally, gastrointestinal peptides such as CCK, PYY, and GLP-1 acutely modulate short-term hunger and satiety balance, contributing to meal termination. The delicate equilibrium between these peptide activities and neuronal circuits forms the foundation for body weight regulation and metabolic homeostasis.
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