İstanbul Sağlık ve Teknoloji Üniversitesi Kurumsal Akademik Arşivi
DSpace@İSTÜN, Üniversite mensupları tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Temporal trends and regional variations in hepatocellular carcinoma etiology: A multinational study across Asia
(Springer Nature Link, 2026) Takeuchi, Yasuto; Tateishi, Ryosuke; Obi, Shuntaro; Otsuka, Motoyuki; Mochizuki, Hitoshi; Jazag, Amarsanaa; Yokosuka, Osamu; Ogasawara, Sadahisa; Örmeci, Necati; Sarin, Shiv Kumar; Omata, Masao
Background Hepatocellular carcinoma (HCC) remains a major health burden in Asia. Advances in antiviral therapies are reshaping the etiological landscape of HCC. This study evaluated temporal shifts in HCC etiology across Asian countries and their clinical implications. Methods This multinational study analyzed 6,261 newly diagnosed HCC patients registered in the APASL Hepatology/ Oncology Consortium (A-HOC) from 19 centers across seven Asian countries and regions between 2013 and 2023. Data on demographics, tumor characteristics, etiology, and treatment patterns were collected. Etiologies included hepatitis B virus (HBV), hepatitis C virus (HCV), alcoholic liver disease (ALD), metabolic dysfunction-associated fatty liver disease (MAFLD), MAFLD plus excess alcoholic intake (MAFLD +eAL), autoimmune liver disease, cryptogenic, and others. Temporal trends and regional variations were assessed. Results In many countries, HBV remained predominant (43.3%–69.5%) and relatively stable throughout the period, while HCV showed only modest reductions. In Japan, HCV was the leading cause of HCC (33.1%), with a significant decline over time, accompanied by a rise in MAFLD-related HCC. ALD-related HCC increased in South Korea, and MAFLD-related HCC rose in Turkey. Tumor size and stage at diagnosis varied by etiology and region, affecting treatment strategies. Early stage diagnosis was more frequent in Japan and Taiwan, whereas advanced-stage HCC was common in China and Indonesia. Conclusions Distinct regional patterns and temporal changes in HCC etiology across Asia highlight the need for tailored prevention and surveillance measures. The growing burden of MAFLD-related HCC emphasizes its emerging role in liver cancer development, particularly in regions with declining viral hepatitis.
Metabolik hastalıklara eşlik eden nöropsikiyatrik komorbidite modelleri
(Nobel Tıp Kitabevleri, 2025) Kaya, Gül Büşra; Algül, Sermin; Deniz, Gülnihal; Keskin, Seda
Nöropsikiyatrik komorbiditeler ve metabolik hastalıklar arasında oldukça yakın bir ilgi vardır. Son yıllarda araştırma alanı olarak ve klinikte yoğun ilgi görmektedir. Bu iki konu ile ilgili olarak çeşitli komorbidite modelleri tasarlanıp, geliştirilmiş ve çalışmalara konu olmuştur (1-4). Bu bölümde metabolik hastalıklarla seyreden nöropsikiyatrik komorbidite modellerinin ana başlıkları ve de tayları yer almaktadır.
Diagnosis of muscle diseases nd the use of functional near infrared spectroscopy (fNIRS)
(Türkiye Klinikleri Yayınevi, 2025) Coşkun, Ebru; Hanoğlu, Lütfü
Muscle diseases are a class of illnesses that share several pathologies and can be brought on by auto immune, metabolic, inflammatory, toxic, or hereditary factors. Investigating the pathophysiological properties of diseases and developing appropriate diagnostic methods are essential for implementing appropriate therapeutic approaches and evaluating treatment effectiveness. Although anamnesis and clinical examination findings are still the most effective way to diagnose muscle diseases in routine practice, methods such as muscle electrophysiology, laboratory tests, and neuroimaging are important, especially for the differential diagnosis of complex muscle diseases. In recent years, another neuroim aging method, functional near-infrared spectroscopy (fNIRS), has begun to assess muscle oxygenation during exercise or rest in healthy and pathological conditions. fNIRS is an optical-based, noninvasive imaging method used to assess oxygenation in many tissues, such as the brain and muscle, since the 1980s. It provides information about the metabolic activity of the tissue through tissue oxygenation. The device sends light in the near-infrared range through the source optode to the tissue to evaluate ox ygenation change. Oxygen-carrying chromophores (hemoglobin and myoglobin, respectively) found in blood and skeletal muscle absorb near-infrared light sent to the tissue. Detector optodes collect the rays reflected back from the tissue, and the concentration change of oxygenated and deoxygenated chromophores in the tissue is determined according to the absorption amount. In recent years, its use in various physiological and pathophysiological conditions has become widespread. It is a promising approach, particularly for diagnosing muscle disorders, comprehending their etiology, and developing effective treatment plans.
Spermatogenez
(BİDGE Yayınları, 2025) İnce, Zeynep Yelda; Ündağ, İlknur; Ündağ, İlknur; Dönmez, Hasan Hüseyin
Spermatogenez, testisteki seminifer tübüller içinde yer alan germ hücrelerinin, spermatogonyal kök hücre düzeyinden olgun spermatozoona kadar ilerleyen, mitotik, mayotik ve postmayotik farklılaşma basamaklarını içeren son derece organize bir süreçtir (Jan ve ark., 2017; Griswold, 2018). Bu süreç boyunca spermatogonyumlar, kendini yenileme ve farklılaşma arasında karmaşık bir denge kurarak gelişimsel kaderlerini belirlerken, primer ve sekonder spermatositler ardışık mayoz bölünmeler aracılığıyla kromozom yükünü haploid düzeye indirger. Bunu takiben, spermatidler spermiogenez olarak tanımlanan terminal maturasyon evresinde yoğun bir morfolojik ve yapısal yeniden düzenlenme geçirerek fonksiyonel spermatozoona dönüşür (Rowley ve ark., 1971; Zickler & Kleckner, 2015). Spermatogenez, yalnızca germ hücre döngüsünün içsel kinetiklerine indirgenemeyecek kadar kompleks bir biyolojik süreç olup, Sertoli hücreleri, Leydig hücreleri, peritübüler miyoid hücreler ve interstisyel mikroçevrenin bütünleşik yapısal ve parakrin katkıları ile şekillenir (Griswold, 2018; Thumfart & Mansuy, 2023). Seminifer epitelde her bir gelişim basamağının belirli bir mekânsal ve zamansal dizilim içerisinde ortaya çıkması, germ hücre maturasyonunun yüksek derecede organize bir epitel siklusuna tabi olduğunu ve bu siklusun seminifer tübüller boyunca koordineli olarak ilerleyen, ardışık gelişimsel kümeler şeklinde düzenlendiğini ortaya koymaktadır (Jan ve ark., 2017). Güncel araştırmalar, spermatogenezin sürdürülebilir başarısının; germ hücrelerine özgü transkriptomik programların dinamik düzenlenmesi, spermatogonyal kök hücre nişinin yapısal ve işlevsel bütünlüğü, Sertoli hücrelerinden salınan büyüme faktörleri ile eksozomal yüklerin koordinasyonu ve bunları şekillendiren hassas endokrin ve parakrin sinyal ağlarının etkileşimine bağımlı olduğunu göstermektedir (Fayomi & Orwig, 2018; Tian ve ark., 2024).
Novel 1-benzyl-2-indolinone indole hybrids as tyrosine kinase inhibitors: Design, synthesis, and biological activity evaluation
(Elsevier, 2026) Cihan Üstündağ, Gökçe; Cinek, Tuğçe; Sancar, Serap; Yıldırım, Merve; Genç Akar, Öyküm; Özen Eroğlu, Güneş; Erol Bozkurt, Ayşe; Öztay, Füsun; Soylu Eter, Özge; Bolkent, Şehnaz; Kuruca, Serap; Karalı, Nilgün
In the present study, new 1-benzyl-2-indolinone indole hybrids (4a-s) were synthesized and their cytotoxic ef fects were determined against human breast (MCF-7 and MDA-MB 231), lung (A549), kidney (CAKI-1 and A498), colon (HT-29 and HCT-116), and pancreas (MIA PaCa-2) cancer cells by MTT assay. Some of the tested com pounds showed significantly better inhibitory effects and safety profiles than sunitinib malate against A498 and MIA PaCa-2 cells. Compound 4s showed a selective and significant cytotoxic effect on MIA PaCa-2 cells (IC50 = 0.15 μM; SI > 666.7). Compound 4b displayed significant cytotoxic effects on both A498 (IC50 = 0.87 μM; SI > 58.3) and MIA PaCa-2 (IC50 = 0.13 μM; SI = 390.0) cells. Compound 4b in A498 cells and compounds 4a-c, 4h, and 4s in MIA PaCa-2 cells significantly decreased general tyrosine kinase activity and induced apoptosis, accompanied by reduced ERK signalings. The inhibitory activities of compounds 4a–c, 4h, and 4s against SRC, PDGFR-β, and c-MET kinases were assessed in MIA PaCa-2 cells. Compounds 4a, 4b, 4h, and 4s inhibited PDGFR β, with 4h and 4s additionally targeting c-MET, while 4a, 4b, and 4h also demonstrated SRC inhibition. In this study, lead compounds 4b and 4s were identified as selective cytotoxic agents against human pancreatic car cinoma cells through induction of apoptosis and inhibition of SRC/PDGFR-β/c-MET signaling. Notably, com pounds 4b and 4s demonstrated a significantly better safety profile than sunitinib malate against noncancerous cells, underscoring their broader therapeutic potential. To understand their potential binding modes, molecular modeling studies were performed at the ATP-binding domains of SRC, PDGFR, and c-MET kinases.
