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Sema and stem cell

Margaret Stromecki, Nazanin Tatari, Ludivine Coudière Morrison, Ravinder Kaur, Jamie Zagozewski, Gareth Palidwor, Vijay Ramaswamy, Patryk Skowron, Matthias Wölfl, Till Milde, Marc R Del Bigio, Michael D Taylor, Tamra Werbowetski-Ogilvie
Medulloblastoma (MB) is the most common malignant primary pediatric brain cancer. Among the most aggressive subtypes, Group 3 and Group 4 originate from stem/progenitor cells, frequently metastasize, and often display the worst prognosis, yet we know the least about the molecular mechanisms driving their progression. Here, we show that the transcription factor orthodenticle homeobox 2 (OTX2) promotes self-renewal while inhibiting differentiation in vitro and increases tumor initiation from MB stem/progenitor cells in vivo...
January 27, 2018: Molecular Oncology
Serap Aksoylar, Ali Varan, Canan Vergin, Volkan Hazar, Ferhan Akici, Ayhan Dagdemir, Mustafa Buyukavci, Rejin Kebudi, Nilgun Kurucu, Betul Sevinir, Emel Unal, Sema Vural, Elif Guler, Hilmi Apak, Haldun Oniz, Ceyda Karadeniz, Cengiz Canpolat, Sema Anak, Inci Ilhan, Dilek Ince, Emre Cecen, Nur Olgun
BACKGROUND: The national protocol aimed to improve the outcome of the high risk neuroblastoma patients by high-dose chemotherapy and stem cell rescue with intensive multimodal therapy. MATERIALS AND METHODS: After the 6 induction chemotherapy cycles, patients without disease progression were nonrandomly (by physicians' and/or parent's choices) allocated into two treatment arms, which were designed to continue the conventional chemotherapy (CCT), or myeloablative therapy with autologous stem cell rescue (ASCR)...
April 2017: Journal of Cancer Research and Therapeutics
Volkan Hazar, Vural Kesik, Gülsün Tezcan Karasu, Gülyüz Öztürk, Alphan Küpesiz, Suar Çakı Kılıç, Erman Ataş, Vedat Uygun, Nurşah Eker, Fatih Erbey, Şebnem Yılmaz Bengoa, Suna Emir, Sema Anak, Haldun Öniz, Hayriye Daloğlu, Serap Aksoylar, Ülker Koçak, Musa Karakükçü, Murat Elli, Nilgün Kurucu, Akif Yeşilipek
We examined outcomes of 62 pediatric patients with relapsed or refractory non-Hodgkin lymphoma (rr-NHL) who underwent hematopoietic stem cell transplantation (HSCT). The overall survival (OS) and event-free survival (EFS) rates were 65% and 48%, respectively. Survival rates for patients with chemosensitive disease at the time of HSCT were significantly higher than those of patients with chemoresistant disease (69% vs. 37%, p = .019 for OS; 54% vs. 12%, p < .001 for EFS; respectively). A chemoresistant disease at transplantation was the only factor that predicted a limited OS (hazard ratio = 10...
June 2, 2017: Leukemia & Lymphoma
Hung-Chang Shen, Sao-Yu Chu, Tsai-Chi Hsu, Chun-Han Wang, I-Ya Lin, Hung-Hsiang Yu
Elucidating how appropriate neurite patterns are generated in neurons of the olfactory system is crucial for comprehending the construction of the olfactory map. In the Drosophila olfactory system, projection neurons (PNs), primarily derived from four neural stem cells (called neuroblasts), populate their cell bodies surrounding to and distribute their dendrites in distinct but overlapping patterns within the primary olfactory center of the brain, the antennal lobe (AL). However, it remains unclear whether the same molecular mechanisms are employed to generate the appropriate dendritic patterns in discrete AL glomeruli among PNs produced from different neuroblasts...
April 2017: PLoS Genetics
Emin Kurekci, Alphan Küpesiz, Sema Anak, Gülyüz Öztürk, Orhan Gürsel, Serap Aksoylar, Talia Ileri, Barış Kuşkonmaz, İbrahim Eker, Mualla Cetin, Gülsün Tezcan Karasu, Zühre Kaya, Tunç Fışgın, Mehmet Ertem, Savaş Kansoy, Mehmet Akif Yeşilipek
Preimplantation genetic diagnosis involves the diagnosis of a genetic disorder in embryos obtained through in vitro fertilization, selection of healthy embryos, and transfer of the embryos to the mother's uterus. Preimplantation genetic diagnosis has been used not only to avoid the risk of having an affected child, but it also offers, using HLA matching, preselection of potential HLA-genoidentical healthy donor progeny for an affected sibling who requires bone marrow transplantation. Here, we share the hematopoietic stem cell transplantation results of 52 patients with different benign and malign hematological or metabolic diseases or immunodeficiencies whose donors were siblings born with this technique in Turkey since 2008...
February 10, 2017: Biology of Blood and Marrow Transplantation
Rejin Kebudi, Harzem Ozger, Hande Kızılocak, Sema Buyukkapu Bay, Bilge Bilgiç
Osteosarcoma as a secondary malignancy after hematopoietic stem cell transplantation (HSCT) is very rare. We present a case and review of 18 other cases reported to date. Our patient underwent HSCT for myelodysplastic syndrome at the age of 4 years. She developed osteosarcoma 13 years later. She underwent surgery after three courses of neoadjuvant chemotherapy followed by chemotherapy and mifamurtide. She has no evidence of disease 28 months after termination of chemotherapy. In 18 other cases of secondary osteosarcoma in the literature, 15 had received total body irradiation, eight had received alkylating agents, and six had received etoposide...
September 2016: Pediatric Blood & Cancer
Volkan Hazar, Vural Kesik, Serap Aksoylar, Musa Karakukcu, Gulyuz Ozturk, Alphan Kupesiz, Erman Atas, Haldun Oniz, Savas Kansoy, Ekrem Unal, Atila Tanyeli, Fatih Erbey, Murat Elli, Nurdan Tacyildiz, Gulsun Tezcan Karasu, Ulker Kocak, Sema Anak, Sebnem Yilmaz Bengoa, Gulay Sezgin, Didem Atay, Emel Unal, Vedat Uygun, Nilgun Kurucu, Zuhre Kaya, Akif Yesilipek
This study evaluates the outcome of 66 pediatric patients with rrHL who underwent autoHSCT. Twenty-nine patients experienced early relapse, and 19 patients experienced late relapse. Of 18 newly diagnosed with HL, 13 were primary refractory disease and five had late responsive disease. At the time of transplantation, only 68% of the patients were chemosensitive. The majority of patients received BCNU + etoposide + ara-C + melphalan for conditioning (45/66), and peripheral blood (56/66) was used as a source of stem cells...
November 2015: Pediatric Transplantation
Tuba Hacibekiroglu, Sema Akinci, Abdulkadir Basturk, Besime inal, Tekin Guney, Sule Mine Bakanay, Imdat Dilek
BACKGROUND: Chronic myeloproliferative diseases are clonal stem cell diseases which occur as a result of uncontrollable growth and reproduction of hematopoietic stem cells, which are the myeloid series source in bone marrow. Recent studies have suggested that chronic inflammation can be a triggering factor in the clonal change in chronic myeloproliferative neoplasia (CMPN). In our study, we evaluated the existence of a chronic inflammation process in our Philadelphia negative (Ph-)CMPN patients using inflammation parameters in combination with demographic, laboratory and clinical characteristics of the patients...
2015: Asian Pacific Journal of Cancer Prevention: APJCP
Sema S Hakki, Seyit Ali Kayis, Erdogan E Hakki, S Buket Bozkurt, Gokhan Duruksu, Zehra Seda Unal, Gizem Turaç, Erdal Karaoz
BACKGROUND: Cell-based therapy using mesenchymal stem cells (MSCs) seems promising to obtain regeneration of dental tissues. A comparison of tissue sources, including periodontal ligament (PDL) versus pulp (P), could provide critical information to select an appropriate MSC population for designing predictable regenerative therapies. The purpose of this study is to compare the proliferation and stemness and the MSC-specific and mineralized tissue-specific gene expression of P-MSCs and PDL-MSCs...
February 2015: Journal of Periodontology
Semra Kahraman, Cagri Beyazyurek, Mehmet Akif Yesilipek, Gulyuz Ozturk, Mehmet Ertem, Sema Anak, Savas Kansoy, Serap Aksoylar, Barış Kuşkonmaz, Haldun Oniz, Shimon Slavin, Zeynep Karakas, Huseyin Avni Tac, Nese Gulum, Gokhan Cumhur Ekmekci
Haematopoietic stem cell transplantation (HSCT) remains the best therapeutic option for many acquired and inherited paediatric haematological disorders. Unfortunately, the probability of finding an HLA matched donor is limited. An alternative technique is PGD combined with HLA matching, which offers the possibility of selecting unaffected embryos that are HLA compatible with the sick child, with the aim of possible use of stem cells from the resulting baby in future. Since the first successful report for Fanconi anaemia a decade ago, the therapeutic success of this technique was reported in a few cases and for a limited number of disorders...
September 2014: Reproductive Biomedicine Online
Sema S Hakki, Buket Bozkurt, Erdogan E Hakki, Seyit Ali Kayis, Gizem Turac, Irem Yilmaz, Erdal Karaoz
The utility of adult stem cells for bone regeneration may be an attractive alternative in the treatment of extensive injury, congenital malformations, or diseases causing large bone defects. To create an environment that is supportive of bone formation, signals from molecules such as the bone morphogenetic proteins (BMPs) are required to engineer fully viable and functional bone. We therefore determined whether BMP-2, -6, and -7 differentially regulate the (1) proliferation, (2) mineralization, and (3) mRNA expression of bone/mineralized tissue associated genes of human periodontal ligament stem cells (hPDLSCs), which were obtained from periodontal ligament tissue of human impacted third molars...
January 2014: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Amanda Boyd, Hui Zhang, Anna Williams
Failure of remyelination of multiple sclerosis (MS) lesions contributes to neurodegeneration that correlates with chronic disability in patients. Currently, there are no available treatments to reduce neurodegeneration, but one therapeutic approach to fill this unmet need is to promote remyelination. As many demyelinated MS lesions contain plentiful oligodendrocyte precursor cells (OPCs), but no mature myelinating oligodendrocytes, research has previously concentrated on promoting OPC maturation. However, some MS lesions contain few OPCs, and therefore, remyelination failure may also be secondary to OPC recruitment failure...
June 2013: Acta Neuropathologica
M Akif Yesilipek, Mehmet Ertem, Mualla Cetin, Haldun Öniz, Savas Kansoy, Atila Tanyeli, Sema Anak, Emin Kurekci, Volkan Hazar
From January 1991 to June 2009, 245 children with beta thalassemia major who underwent their first allogeneic HSCT in Turkey and who were followed for a minimum of one yr post-transplantation were enrolled this study. The median age of the patients was 6.6 yr old (range, 1-22 yr). The distribution of Pesaro risk class I, II, and III categories was 41, 130, and 63 children, respectively. The median serum ferritin level was 2203 ng/mL. Eighty-eight patients received bone marrow (BM) stem cells; 137, peripheral blood (PB) stem cells; and 20, cord blood (CB) stem cells...
December 2012: Pediatric Transplantation
Sema Yilmaz, Nihal Inandiklioglu, Dincer Yildizdas, Cansu Subasi, Arbil Acikalin, Yurdun Kuyucu, Ibrahim Bayram, Ali Topak, Atila Tanyeli, Gokhan Duruksu, Erdal Karaoz
We hypothesized that bone marrow-derived mesenchymal stem cells (BM-MSCs) would have a possible role in the treatment of acute respiratory distress syndrome (ARDS). ARDS disease model was developed in Wistar albino male rats by intratracheal instillation of physiological saline solution. Anesthezied and tracheotomized rats (n = 8) with ARDS were pressure-controlled ventilated. Isolated and characterized rat (r-) BM-MSCs were labeled with GFP gene, and introduced in the lungs of the ARDS rat-model. After applying of MSCs, the life span of each rat was recorded...
February 2013: Stem Cell Reviews
Séverine Lecourt, Yves Lepelletier, Valérie Vanneaux, Rafika Jarray, Thomas Domet, Françoise Raynaud, Réda Hadj-Slimane, Audrey Cras, Olivier Hermine, Jean-Pierre Marolleau, Jérôme Larghero
In human skeletal muscle, myoblasts represent the main population of myogenic progenitors. We previously showed that, beside their myogenic differentiation capacities, myoblasts also differentiate towards osteogenic and chondrogenic lineages, some properties generally considered being hallmarks of mesenchymal stem cells (MSCs). MSCs are also characterized by their immunosuppressive potential, through cell-cell contacts and soluble factors, including prostaglandin E-2 (PGE-2), transforming growth factor-β1 (TGF-β1), interleukine-10, or indoleamine 2,3-dioxygenase...
2012: Stem Cells International
Joby J Westmoreland, Gamze Kilic, Caroline Sartain, Sema Sirma, Jennifer Blain, Jerold Rehg, Natasha Harvey, Beatriz Sosa-Pineda
BACKGROUND & AIMS: The exocrine portion of the pancreas functions in digestion and preserves pancreatic homeostasis. Learning how this tissue forms during embryogenesis could improve our understanding of human pancreatic diseases. Expression of the homeobox gene Prox1 in the exocrine pancreas changes throughout development in mice. We investigated the role of Prox1 in development of the exocrine pancreas in mice. METHODS: Mice with pancreas-specific deletion of Prox1 (Prox1(ΔPanc)) were generated and their pancreatic tissues were analyzed using immunohistochemistry, transmission electron microscopy, histologic techniques, quantitative real-time polymerase chain reaction, immunoblotting, and morphometric analysis...
April 2012: Gastroenterology
Berna Tezcan, Sema Serter, Esat Kiter, A Cevik Tufan
Recent investigations credited important roles to C-type natriuretic peptide (CNP) signaling during chondrogenesis. This study investigated the putative role of CNP in transforming growth factor (TGF)-β1 induced in vitro chondrogenic differentiation of mesenchymal stem cells (MSCs) in pellet culture. MSCs were derived from human trabecular bone and were characterized on the basis of their cell surface antigens and adipogenic, osteogenic, and chondrogenic differentiation potential. TGF-β1 induced chondrogenic differentiation and glycosaminoglycan (GAG) synthesis was analyzed on the basis of basic histology, collagen type II, Sox 9 and aggrecan expressions, and Alcian blue staining...
October 2010: Journal of Molecular Histology
Fatih Erbey, Ibrahim Bayram, Baris Kuskonmaz, Sema Yilmaz, Mualla Cetin, Duygu Uckan, Atila Tanyeli
OBJECTIVES: We define the incidence, risk factors, and mortality rates for the occurrence of thrombotic microangiopathy in 50 children who underwent transplants between January 2006 and June 2008 at 2 Turkish pediatric centers. MATERIALS AND METHODS: The diagnosis of thrombotic microangiopathy was done according to the reports of International Working Group in 2007. RESULTS: Fifty patients (27 male and 23 female; age range, 3 months to 18 years) were included...
September 2010: Experimental and Clinical Transplantation
Sema Anak, Didem Atay, Aysegul Unuvar, Mesut Garipardic, Leyla Agaoglu, Gulyuz Ozturk, Zeynep Karakas, Omer Devecioglu
BACKGROUND: Respiratory syncytial virus (RSV) has been reported to cause severe morbidity and mortality among cancer patients receiving chemotherapy with or without autologous/allogeneic hematopoetic stem cell transplantation (HSCT). There have been few reports describing the outcome of RSV infection specifically among pediatric oncology patients. METHODS: Two RSV infection outbreaks developed between February-April 2006 and January-March 2009 in hospitalized pediatric patients for various hemato-oncological diseases + or - HSCT...
March 2010: Pediatric Pulmonology
Karl Sotlar, Sema Colak, Anja Bache, Sabina Berezowska, Manuela Krokowski, Burkhard Bültmann, Peter Valent, Hans-Peter Horny
In a substantial number of patients with systemic mastocytosis (SM), an associated clonal haematological non-mast cell lineage disease (AHNMD) is detectable. Although most of these patients display KIT mutations, especially KIT(D816V), little is known about their exact frequency and their distribution in AHNMD subtypes. We examined 48 patients with SM-AHNMD for the presence of mutant KIT in the SM and AHNMD components of the disease. Mast cells and AHNMD cells were obtained from immunostained bone marrow sections by laser microdissection and examined by melting point analysis of nested-PCR products...
April 2010: Journal of Pathology
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