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Ilona Okhremchuk, Anh Tuan Nguyen, Bernard Fouet, Jean-Jacques Morand
An 83-year-old man presented to the dermatology department for an ulcerated skin lesion of the back that had been increasing in size during the past 11 years. The physical examination revealed a well-defined, fleshy, reddish plaque measuring 10 × 20 cm in diameter with erosions and black areas on the surface. The patient underwent surgical excision with margins of 10 mm followed by a skin graft. Histologic section showed a lesion composed of 2 intimately intermingled epithelial and mesenchymal components associated with a basal cell carcinoma (BCC)...
June 14, 2018: American Journal of Dermatopathology
Shuangjiao Deng, Hongfei Wang, Heng Fan, Lijuan Zhang, Jianli Hu, Qing Tang, Zhexing Shou, Xingxing Liu, Dongmei Zuo, Jia Yang, Meng Xu, Qianyun Chen, Yalan Dong, Zhen Nan, Hui Wu, Yujin Liu
Our study was to explore the potential role of miRNA-200b in modulating tumorigenesis in the model of ulcerative colitis-related colorectal cancer (UCRCC) and, further, to decipher the underlying mechanisms associated with this effect. In this study, we examined a greater number of polyps or adenomas, a higher grade of epithelial dysplasia accompanied with a decrease in survival ratio in azoxymethane (AOM)/dextran sulfate sodium (DSS) model mice compared to mice treated with over-expressed miRNA-200b. Surprisingly, enforced miRNA-200b expression significantly suppressed AOM/DSS-induced up-regulation of oncologic markers including β-catenin and CD133...
June 19, 2018: International Immunopharmacology
Joanna Maria Sadowska, Jordi Guillem-Marti, Montserrat Espanol, Christoph Stähli, Nicola Döbelin, Maria-Pau Ginebra
Biomaterials can interact with cells directly, that is, by direct contact of the cells with the material surface, or indirectly, through soluble species that can be released to or uptaken from the surrounding fluids. However, it is difficult to characterise the relevance of this fluid-mediated interaction separately from the topography and composition of the substrate, because they are coupled variables. These fluid-mediated interactions are amplified in the case of highly reactive CaPs such as biomimetic calcium deficient hydroxyapatite (CDHA), particularly in static in vitro cultures...
June 19, 2018: Acta Biomaterialia
Yang Song, Hong-Yan Zhao, Zhong-Shi Lyu, Xie-Na Cao, Min-Min Shi, Qi- Wen, Fei-Fei Tang, Yu Wang, Lan-Ping Xu, Xiao-Hui Zhang, Xiao-Jun Huang, Yuan Kong
Poor graft function (PGF) is a life-threatening complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT) and is characterized by defective hematopoiesis. Mesenchymal stem cells (MSCs) have been shown to support hematopoiesis, but little is known about the role of MSCs in the pathogenesis of PGF. In the current prospective case-control study, we evaluated whether the number and function of bone marrow (BM) MSCs in PGF patients differed from those in good graft function (GGF) patients. We found that BM MSCs from PGF patients expanded more slowly and appeared flattened and larger, exhibiting more apoptosis and senescence than MSCs from GGF patients...
June 19, 2018: Biology of Blood and Marrow Transplantation
Marzieh Mohammadi, Mona Alibolandi, Khalil Abnous, Zahra Salmasi, Mahmoud Reza Jaafari, Mohammad Ramezani
In the present study, we fabricated an efficient, simple biomimetic scaffold to stimulate osteogenic differentiation of mesenchymal stem cells (MSCs). Electrospun poly L-lactic acid nanofibers were employed to mimic the nanofibrillar structure of bone proteins and coated with hydroxyapatite nanoparticles to simulate bone minerals. Thereafter, we regulated the release pattern of BMP-2 peptide through covalent attachment of an optimized liposomal formulation to the scaffold. The fabricated platform provided a sustained release profile of BMP-2 peptide up to 21days while supported cellular attachment and proliferation without cytotoxicity...
June 19, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Luisa H A Silva, Sueli M da Silva, Emilia C D Lima, Renata C Silva, Daniel J Weiss, Marcelo M Morales, Fernanda F Cruz, Patricia R M Rocco
The magnetic targeting (MT) technique improves delivery of mesenchymal stromal cells (MSCs) to target sites. However, the moderate-intensity static magnetic fields (SMF) used for MT may exert adverse effects on MSCs. Thus, we aimed to evaluate the effects of SMF on MSCs in vitro. Cells were initially magnetized using citrate-coated magnetite nanoparticles. Then, control and magnetized MSCs were transferred to an in vitro MT system and exposed to 0.3-0.45 Tesla SMFs. MSC viability, morphology, ultrastructure, proliferation rates, differentiation, and immunomodulation were evaluated after 24 and 48hours of exposure...
June 19, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Michael Bartoschek, Kristian Pietras
The development and progression of a tumor depends on the close interaction of malignant cells and the supportive and suppressive tumor microenvironment. Paracrine signaling enables tumor cells to shape the surrounding tissue in order to decrease recognition by the immune system, attract blood vessels to fuel growth, change metabolic programs and induce wound healing programs. In this study, we investigate the role of the platelet-derived growth factor (PDGF) family members PDGFA, PDGFB, PDGFC and PDGFD and their cognate tyrosine kinase receptors PDGFRA and PDGFRB, using publicly available data from The Cancer Genome Atlas and the Human Protein Atlas...
June 19, 2018: Biochemical and Biophysical Research Communications
Jian Wu, Jibo Liu, Yaqin Ding, Mingying Zhu, Kan Lu, Jing Zhou, Xin Xie, Yi Xu, Xiaoyu Shen, Yiyue Chen, Xiaohong Shao, Chunling Zhu
Emerging evidence has shown that microRNAs (miRNAs) play a mediatory role in the pathogenesis of diabetic nephropathy (DN), but the function of the involved miRNAs is still incomplete. Here, we found that miR-455-3p was down-regulated in the human mesangial cells (HMC) and human proximal tubule epithelial cells (HK-2) stimulated with high glucose (HG) or transforming growth factor beta 1 (TGF-β1). Rho-associated coiled coil-containing protein kinase 2 (ROCK2) was identified as a directed target of miR-455-3p...
June 19, 2018: Biochemical and Biophysical Research Communications
Lei Liu, Yiping Li, Zhi Wang, Fengan Ding, Zhengyuan Cheng, Qing Xu, Yingying Cai, Manoj Hang Limbu, Yiqiong Yang, Bicheng Liu, Pingsheng Chen
Most patients with chronic kidney disease (CKD) present with proteinuria and extracellular matrix (ECM) deposition in the interstitium. Matrix metalloproteinase-2 (MMP-2) is important for maintaining ECM metabolism and it affects the formation and development of CKD. Autophagy has been reported to be protective against renal tubular injury, but the role of autophagy related to ECM metabolism is unclear. Rab7 is a shared molecule of endocytosis and autophagy. The aim of this study is to explore the role of autophagy in regulating MMP-2 activity and to determine whether Rab7 functions in regulating MMP-2 activity and injury in albumin-overloaded TECs...
June 19, 2018: Experimental Cell Research
H Wang, C Lv, Y Gu, Q Li, L Xie, H Zhang, D Miao, W Sun
Sirt1 promotes odontoblastic gene expression in human dental pulp cells, whereas the inhibition of Sirt1 downregulates the expression of those genes. To investigate whether the overexpression of Sirt1 in mesenchymal stem cells (MSCs) driven by Prx1 promoter could rescue the dentin formation defects in Bmi1-deficient (Bmi1-/- ) mice, we established the MSCs overexpressing Sirt1 in Bmi1 knockout mice (Sirt1TG Bmi1-/- ). First, we used Prx1-Cre/ROSAnTnG mice to demonstrate that Prx1 linage cells exist mainly in the pulp horns at 4 wk of age...
June 1, 2018: Journal of Dental Research
Wei Nie, Xiaoqian Ma, Cejun Yang, Zeyi Chen, Pengfei Rong, Minghua Wu, Jianhui Jiang, Mengqun Tan, Shounan Yi, Wei Wang
BACKGROUND: Hypoxia-induced damage is one of the key factors associated with islet graft dysfunction. Mesenchymal stem cells (MSCs) could be used to enhance the therapeutic effect of islet transplantation due to their paracrine potential such as exosomes. In this study, we investigated whether exosomes from human umbilical cord-derived MSC-conditioned medium (hu-MSC-CM) could increase the survival and function of neonatal porcine islet cell clusters (NICCs) exposed to hypoxia. METHODS: Neonatal porcine islet cell clusters were cultured with hu-MSC-CM, with or without exosomes, and native medium RPMI-1640 (Control) under hypoxic conditions (1% O2 )...
June 22, 2018: Xenotransplantation
Song Zhou, Yong-Guang Liu, Ya Zhang, Jian-Min Hu, Ding Liu, Hua Chen, Min Li, Ying Guo, Li-Pei Fan, Liu-Yang Li, Ming Zhao
An increasing number of experiments and clinical trials have demonstrated the safety, feasibility, and efficacy of mesenchymal stem cells (MSCs)-based therapies for the treatment of various diseases. The main drawbacks of MSC therapy are the lack of specific homing after systemic infusion and early death of injected cells because of the injury micro-environment. We pretreated bone mesenchymal stem cells (BMSCs) with erythropoietin (EPO) to investigate their positive effect on cyclosporine A (CsA)-induced nephrotoxicity...
June 22, 2018: Journal of Cellular Biochemistry
Carlos Alventosa Mateu, Génesis Aurora Castillo López, Cecilia Albert Antequera
Schwannoma is a mesenchymal tumor that is mainly located in the peripheral nerves or the central nervous system. Its retroperitoneal location is rare and commonly asymptomatic. Thus, it is usually diagnosed when imaging tests are performed for other purposes. The clinical course of Schwannoma is benign but it also has malignant potential. Therefore, surgical resection is the treatment of choice. The definitive diagnosis is anatomopathological. In this context, we present a patient with retroperitoneal Schwannoma...
June 22, 2018: Revista Española de Enfermedades Digestivas
Alexander Rühle, Peter E Huber, Rainer Saffrich, Ramon Lopez Perez, Nils H Nicolay
Chemotherapeutic agents are part of the standard treatment algorithms for many malignancies; however, their application and dosage are limited by their toxic effects to normal tissues. Chemotherapy-induced toxicities can be long-lasting and may be incompletely reversible; therefore, causative therapies for chemotherapy-dependent side effects are needed, especially considering the increasing survival rates of treated cancer patients. Mesenchymal stem cells (MSCs) have been shown to exhibit regenerative abilities for various forms of tissue damage...
June 22, 2018: International Journal of Cancer. Journal International du Cancer
Trushil Shah, Shanshan Qin, Mona Vashi, Dan N Predescu, Niranjan Jeganathan, Cristina Bardita, Balaji Ganesh, Salvatore diBartolo, Louis F Fogg, Robert A Balk, Sanda A Predescu
BACKGROUND: Pulmonary endothelial cells' (ECs) injury and apoptotic death are necessary and sufficient for the pathogenesis of the acute respiratory distress syndrome (ARDS), regardless of epithelial damage. Interaction of dysfunctional ECs with circulatory extracellular vesicles (EVs) holds therapeutic promise in ARDS. However, the presence in the blood of long-term ARDS survivors of EVs with a distinct phenotype compared to the EVs of non-surviving patients is not reported. With a multidisciplinary translational approach, we studied EVs from the blood of 33 patients with moderate-to-severe ARDS...
June 22, 2018: Clinical and Translational Medicine
Hong Ruan, Renshun Xiao, Xinghai Jiang, Biao Zhao, Kai Wu, Zongzuan Shao, Zhongjie Zhang, Huyang Duan, Yulin Song
Bone marrow mesenchymal stem cells (BMSCs) are multipotential differentiation cells which can differentiate into different cell types such as osteoblasts, chondrocytes, adipocytes, cardiomyocytes, hepatocytes, endothelial cells, and neuronal cells. Such multipotential differentiation makes them attractive for stem cell-based therapy aimed at treating previously incurable disorders. In the present work, we encapsulated BMSCs into a hydrogel with a three-dimensional (3D) network of nanofibers, formed from self-assembling of peptide amphiphile...
June 21, 2018: Molecular and Cellular Biochemistry
Vesna Bucan, Desiree Vaslaitis, Claas-Tido Peck, Sarah Strauß, Peter M Vogt, Christine Radtke
Peripheral nerve injury requires optimal conditions in both macro-environment and microenvironment for promotion of axonal regeneration. However, most repair strategies of traumatic peripheral nerve injury often lead to dissatisfying results in clinical outcome. Though various strategies have been carried out to improve the macro-environment, the underlying molecular mechanism of axon regeneration in the microenvironment provided by nerve conduit remains unclear. In this study, we evaluate the effects of from adipose-derived mesenchymal stem cells (adMSCs) originating exosomes with respect to sciatic nerve regeneration and neurite growth...
June 21, 2018: Molecular Neurobiology
D Durand-Herrera, F Campos, B D Jaimes-Parra, J D Sánchez-López, R Fernández-Valadés, M Alaminos, A Campos, V Carriel
Microtissues (MT) are currently considered as a promising alternative for the fabrication of natural, 3D biomimetic functional units for the construction of bio-artificial substitutes by tissue engineering (TE). The aim of this study was to evaluate the possibility of generating mesenchymal cell-based MT using human umbilical cord Wharton's jelly stromal cells (WJSC-MT). MT were generated using agarose microchips and evaluated ex vivo during 28 days. Fibroblasts MT (FIB-MT) were used as control. Morphometry, cell viability and metabolism, MT-formation process and ECM synthesis were assessed by phase-contrast microscopy, functional biochemical assays, and histological analyses...
June 11, 2018: Histochemistry and Cell Biology
Gautam Dutta, Robin Gupta, Manish Garg, Daljit Singh, Hukum Singh, Arvind K Srivastava, Anita Jagetia
Background: Gliosarcoma is a rare high-grade malignant tumor and a variant of glioblastoma characterized by biphasic glial and mesenchymal components. Gliosarcomas occur most commonly in the fifth or sixth decade of life and have a temporal lobe predilection. Occurrence in the pediatric population is extremely rare. Case Description: Here, we report the case of an 8-year-old child with histologically confirmed gliosarcoma at the parieto-occipital lobe. Only a subtotal resection of the tumor mass could be performed in view of massive bleeding from the tumor bed; and despite postoperative chemotherapy and radiotherapy, the tumor recurred in a short span of time...
2018: Surgical Neurology International
Shinji Nakamichi, Masahiro Seike, Akihiko Miyanaga, Mika Chiba, Fenfei Zou, Akiko Takahashi, Arimi Ishikawa, Shinobu Kunugi, Rintaro Noro, Kaoru Kubota, Akihiko Gemma
Anaplastic lymphoma kinase tyrosine kinase inhibitors (ALK-TKIs) induce a dramatic response in non-small cell lung cancer (NSCLC) patients with the ALK fusion gene. However, acquired resistance to ALK-TKIs remains an inevitable problem. In this study, we aimed to discover novel therapeutic targets to conquer ALK-positive lung cancer. We established three types of ALK-TKI (crizotinib, alectinib and ceritinib)-resistant H2228 NSCLC cell lines by high exposure and stepwise methods. We found these cells showed a loss of ALK signaling, overexpressed AXL with epithelial-mesenchymal transition (EMT), and had cancer stem cell-like (CSC) properties, suggesting drug-tolerant cancer cell subpopulations...
June 5, 2018: Oncotarget
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