Browsing by Author "Altunkaynak, Berrin Zühal"

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Investigation of the Relationship Between HMGB1 and Obesity in the Adrenal Gland
(2022) Muhammed ERDAL; Işınsu Aydın Alkan; Emin Oztas; Berrin Zuhal ALTUNKAYNAK; Adem KOCAMAN
Aim: The interaction between obesity and increased production of pro-inflammatory cytokines results the existence of inflammation HMGB1 secreted from the adrenal gland can play a role in inflammation pathways. The aim of this study is to explain the link between HMGB1 and obesity in the adrenal gland. Material and Methods: In this study; eighteen female Wistar Albino rats were divided into two groups: untreated control group (n=8) and obese group (n=10). The rats in obese group were fed with high fat diet for ten weeks. Morphometric parameters of adrenal gland were assessed by using stereological techniques. The expression of high mobility group box protein 1 (HMGB1) in adrenal gland was evaluated. Results: At the end of the analyses; mean volumes of zona fasciculate, zona reticularis, and medulla were significantly increased in obese group. Also, the number of HMGB1 stained cells was significantly increased in the obese group in comparison to control group.Conclusion: The results suggest that obesity may be one of the reasons of inflammation and hypertrophy in the adrenal gland. HMGB1 may provide a novel perspective into the anti-inflammatory therapeutic strategies in obese patients.
Melatonin and sciatic nerve injury repair: a current perspective
(Dove Medical Press Ltd, 2018) Altunkaynak, Berrin Zuhal; Delibas, Burcu; Altun, Gamze; Deniz, Omur Gulsum
Peripheral nerve injury is an important clinical problem that can exert hazardous effects on the health of patients. For this reason, there are more studies conducted on the regeneration of the peripheral nerves via the usage of the nerves belonging to various animals with different types of lesions, ages, and by using different methods of assessment with regular follow-up. Contrary to data obtained through experimentation and clinical observation, no ideal way of treatment was found to increase the regeneration of the peripheral nerves. Finally, the effects of melatonin in the protection of peripheral nerves against trauma, especially the protection of sciatic nerve from pathological conditions, have come into attention in a wide group of scientists as there are beneficial effects of melatonin after surgery. While numerous studies indicate the melatonin's protective effects on the pathologies of nerves, there are also studies reporting its toxic effects on peripheral nerves. Melatonin is a widespread and crucial signaling molecule due to its features of free radical scavenging and anti-oxidation at both pharmacological and physiological conditions in vivo. In this context, although there are numerous studies elaborating the effects of melatonin in various tissues, its effects on peripheral nerves was documented in only a limited number of studies. The aim of this article was to perform a review of the knowledge in the literature on the subject of mostly beneficial or hazardous effects of melatonin on the repair of the damaged peripheral nerves.
Periferik Sinir Yaralanmaları ve Rejenerasyonu
(2022) Berrin Zuhal ALTUNKAYNAK; Işınsu Aydın Alkan; Esra BEKAR
Periferik sinirler merkezi sinir sistemi ve periferal organlar arasındaki motor ve duyu uyarımını sağlayan hedef organda uyardıkları fonksiyonlara göre isimledirilen çeşitli sinir liflerinden oluşan sistemdir. Travmalara oldukça açık bulunan periferik sinirlerde farklı sebepler ile yaralanmalar gözlemlenir. Bu şekilde periferik sinirlerde oluşabilecek hasar kişinin motor ve duyu uyarımını olumsuz etkilemektedir. Periferal yaralanmaların ardından perifrerik sinirde hasara bağlı olarak dejeneratif süreçler başlatılır. Aksonal devamlılığı kesintiye uğratacak derecedeki yaralanmalarda aksonda sinir fonksiyonunun devamlılığı için gereken metabolik olaylar gerçekleşemediği için distal kısımlar dejenerasyona uğrar. Periferik sinir rejenerasyonunda Schwann hücre dediferansiyasyonu, proliferasyonu ve remiyelinizasyon önemli rol oynar. Rejeneratif süreç ise oldukça fazla faktörün bir arada çalıştığı bir süreçtir. Bu derlemede, periferik sinirde meydana gelen yaralanmaların ardından gerçekleşen rejenerasyon süreci, ayrıca rejenerasyona etki eden nörotrofik faktörler ve tedavi sürecinde kullanılan farklı metotların etki mekanizmalarına değinilmiştir.