No abstract

Three‐dimensional (3D) cancer tumor models are becoming vital approaches for high‐throughput drug screening, drug targeting, development of novel theranostic systems, and personalized medicine. Yet, it is becoming more evident that the tumor progression and metastasis is fueled by a subpopulation of stem‐like cells within the tumor that are also called cancer stem cells (CSCs). This study aimed to develop a tumoroid model using CSCs. For this purpose CD133+ cells were isolated from SaOS‐2 osteosarcoma cell line with magnetic‐activated cell sorting. To evaluate tumoroid formation ability, the cells were incubated in different cell numbers in agar gels produced by 3D Petri Dish® method. Subsequently, CD133+ cells and CD133− cells were co‐cultured to investigate CD133+ cell localization in tumoroids. The characterization of tumoroids was performed using Live&Dead staining, immunohistochemistry, and quantitative polymerase chain reaction analysis. The results showed that, CD133+, CD133− and SaOS‐2 cells were all able to form 3D tumoroids regardless of the initial cell number, but, while 72 hr were needed for CD133+ cells to self‐assemble, 24 hr were enough for CD133− and SaOS‐2 cells. CD133+ cells were located within tumoroids randomly with high cell viability. Finally, when compared to two‐dimensional (2D) cultures, there were 5.88, 4.14, 6.95, and 1.68‐fold higher messenger RNA expressions for Sox2, OCT3/4, Nanog, and Nestin, respectively, in CD133+ cells that were cultured within 3D tumoroids, showing longer maintenance of stem cell phenotype in 3D, that can allow more relevant screening and targeting efficiency in pharmaceutical testing. It was concluded that CSC‐based tumoroids are propitious as 3D tumor models to fill the gap between conventional 2D in vitro culture and in vivo animal experiments for cancer research.

These data suggest that the cleavage of FLNA by calpain is an important cellular event in the regulation of tumor cell growth.

The use of stem cells derived from adipose tissue as an autologous and self-replenishing source for a variety of differentiated cell phenotypes, provides a great deal of promise for reconstructive surgery. The secret of the human body, stem cells are reserved. Stem cells are undifferentiated cells found in the human body placed in any body tissue characteristics that differentiate and win ever known to cross the tissue instead of more than 200 diseases and thus improve and, rejuvenates the tissues. So far, the cord blood of newborn babies are used as a source of stem cells, bone marrow, and twenty years after tooth stem cells in human adipose tissue, scientists studied more than other sources of stem cells in adipose tissue and discovered that. Increase in number of in vitro studies on adult stem cells, depending on many variables is that the stem cells directly to the desired soybean optimization can be performed.. We will conclude by assessing potential avenues for developing this incredibly promising field. The aim of this paper is to review the existing literature on applications of harvest, purification, characterization and cryopreservation of adipose-derived stem cells (ASCs). Key words: Stem cell, Adipose tissue, Wound Healing, Differentiation ÖZETKompleks bir canlı olan insan, olağanüstü bir koruma mekanizması geliştirerek zararlı olabilecek etkenlerden mümkün olduğunca kendini uzak tutar ve bunu başarabilmek için de bazı farklılaşmamış hücreleri kullanır. Yani her türlü doku kayıplarında yeniden fonksiyon gösterebilmesinin sırrı sahip olduğu kök hücrelerde saklıdır. Vücudumuzda farklılaşmamış bir hücre olarak bulunan kök hücreler herhangi bir organa yerleştirildiklerinde farklılaşıp o dokunun özelliklerini kazanarak şimdiye kadar bilinen oldukça fazla dokunun yerine geçebilmekte ve bu sayede hastalıkları iyileştirip, dokuları yenileyebilmektedir. Kök hücre kaynağı olarak kullanılan, kordon kanı, kemik iliği ve yirmi yaş dişinden sonra bilim adamları insan yağ dokusunda da kök hücre araştırdılar ve yağ dokusunda diğer kaynaklardan çok daha fazla kök hücre bulunduğunu keşfettiler. Bu hücreler üzerinde yapılan in vitro çalışmalar şunu gösteriyor ki bu hücrelerden birçok değişkene bağlı istenen soya yönelik doğrudan kök hücre optimizasyonu yapılabilmektedir. Bu derlemede de, adipoz kaynaklı kök hücrelerin saflaştırılması ve uygulamalarda kullanılması ile ilgili mevcut literatür gözden geçirilerek bilim dünyasına katı sağlaması amaçlanmıştır.