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https://www.readbyqxmd.com/read/28102835/spinal-cord-regeneration-in-xenopus-laevis
#1
Gabriela Edwards-Faret, Rosana Muñoz, Emilio E Méndez-Olivos, Dasfne Lee-Liu, Victor S Tapia, Juan Larraín
Here we present a protocol for the husbandry of Xenopus laevis tadpoles and froglets, and procedures to study spinal cord regeneration. This includes methods to induce spinal cord injury (SCI); DNA and morpholino electroporation for genetic studies; in vivo imaging for cell analysis; a swimming test to measure functional recovery; and a convenient model for screening for new compounds that promote neural regeneration. These protocols establish X. laevis as a unique model organism for understanding spinal cord regeneration by comparing regenerative and nonregenerative stages...
February 2017: Nature Protocols
https://www.readbyqxmd.com/read/28102558/concise-reviews-regeneration-in-mammalian-cochlea-hair-cells-help-from-supporting-cells-transdifferentiation
#2
Bénédicte Franco, Brigitte Malgrange
It is commonly assumed that mammalian cochlear cells do not regenerate. Therefore, if hair cells are lost following an injury, no recovery could occur. However, during the first postnatal week, mice harbor some progenitor cells that retain the ability to give rise to new hair cells. These progenitor cells are in fact supporting cells. Upon hair cells loss, those cells are able to generate new hair cells both by direct transdifferentiation or following cell cycle re-entry and differentiation. However, this property of supporting cells is progressively lost after birth...
January 19, 2017: Stem Cells
https://www.readbyqxmd.com/read/28102237/tracking-of-mesenchymal-stem-cells-with-fluorescence-endomicroscopy-imaging-in-radiotherapy-induced-lung-injury
#3
Jessica R Perez, Norma Ybarra, Frederic Chagnon, Monica Serban, Sangkyu Lee, Jan Seuntjens, Olivier Lesur, Issam El Naqa
Mesenchymal stem cells (MSCs) have potential for reducing inflammation and promoting organ repair. However, limitations in available techniques to track them and assess this potential for lung repair have hindered their applicability. In this work, we proposed, implemented and evaluated the use of fluorescence endomicroscopy as a novel imaging tool to track MSCs in vivo. MSCs were fluorescently labeled and injected into a rat model of radiation-induced lung injury via endotracheal (ET) or intravascular (IV) administration...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101183/protective-effect-of-berberine-against-oxidative-stress-induced-apoptosis-in-rat-bone-marrow-derived-mesenchymal-stem-cells
#4
Wangyang Li, Yamei Liu, Bin Wang, Yiwen Luo, Nianhong Hu, Dongfeng Chen, Xunchao Zhang, Yunpu Xiong
Bone marrow-derived mesenchymal stem cells (BMSCs) have the potential to be used for the treatment of delayed union, nonunion or persistent bone defects in MSC-based cell therapy. However, implantation of BMSCs into the fracture site is confronted with apoptosis on account of harsh conditions and oxidative stress. In the present study, the anti-apoptotic effects of berberine (BBR) on BMSCs subjected to hydrogen peroxide (H2O2) are investigated, and the potential underlying mechanisms are explored. Oxidative injury was induced by exposure to H2O2, and cell viability was assessed using a cell counting kit-8 assay...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28099928/the-sdf-1-cxcr4-axis-promotes-recovery-after-spinal-cord-injury-by-mediating-bone-marrow-derived-from-mesenchymal-stem-cells
#5
Guo-Dong Wang, Yi-Xun Liu, Xiao Wang, Yong-Le Zhang, Ya-Dong Zhang, Feng Xue
This study aims to explore the role of the SDF-1/CXCR4 axis in mediating BMSCs and SCI recovery. BMSCs were collected and SCI rat models were established. Wistar rats were assigned into the blank control, sham, SCI, SCI + BMSCs, SCI + BMSCs + SDF-1, SCI + BMSCs + AMD3100 (an inhibitor of SDF-1/CXCR4 axis) and SCI + BMSCs + SDF-1 + AMD3100 groups. Hind limb motor function was measured 7, 14, 21 and 28 days after operation. qRT-PCR, western blotting and ELISA was performed to determine the expressions of SDF-1, CXCR4, NGF, BDNF, GFAP and GAP-43, TNF-α, IL-1β, L-6 and IFN-γ...
January 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28098485/effects-of-umbilical-cord-blood-stem-cells-on-healing-factors-for-diabetic-foot-injuries
#6
N Çil, E O Oğuz, E Mete, A Çetinkaya, G A Mete
The use of stem or progenitor cells from bone marrow, or peripheral or umbilical cord blood is becoming more common for treatment of diabetic foot problems. These cells promote neovascularization by angiogenic factors and they promote epithelium formation by stimulating cell replication and migration under certain pathological conditions. We investigated the role of CD34 + stem cells from human umbilical cord blood in wound healing using a rat model. Rats were randomly divided into a control group and two groups with diabetes induced by a single dose of 55 mg/kg intraperitoneal streptozocin...
January 18, 2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/28097682/evaluation-of-perforated-demineralized-dentin-scaffold-on-bone-regeneration-in-critical-size-sheep-iliac-defects
#7
Md Arafat Kabir, Masaru Murata, Toshiyuki Akazawa, Kaoru Kusano, Katsuhisa Yamada, Manabu Ito
OBJECTIVES: Regenerating critical-size bone injury is a major problem that continues to inspire the design of new graft materials. Therefore, tissue engineering has become a novel approach for targeting bone regeneration applications. Human teeth are a rich source of stem cells, matrix, trace metal ions, and growth factors. A vital tooth-derived demineralized dentin matrix is acid-insoluble and composed of cross-linked collagen with growth factors. In this study, we recycled human non-functional tooth into a unique geometric dentin scaffold, entitled perforated root-demineralized dentin matrix (PR-DDM)...
January 17, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28096400/defining-recovery-neurobiology-of-injured-spinal-cord-by-synthetic-matrix-assisted-hmsc-implantation
#8
Alexander E Ropper, Devang K Thakor, InBo Han, Dou Yu, Xiang Zeng, Jamie E Anderson, Zaid Aljuboori, Soo-Woo Kim, Hongjun Wang, Richard L Sidman, Ross D Zafonte, Yang D Teng
Mesenchymal stromal stem cells (MSCs) isolated from adult tissues offer tangible potential for regenerative medicine, given their feasibility for autologous transplantation. MSC research shows encouraging results in experimental stroke, amyotrophic lateral sclerosis, and neurotrauma models. However, further translational progress has been hampered by poor MSC graft survival, jeopardizing cellular and molecular bases for neural repair in vivo. We have devised an adult human bone marrow MSC (hMSC) delivery formula by investigating molecular events involving hMSCs incorporated in a uniquely designed poly(lactic-co-glycolic) acid scaffold, a clinically safe polymer, following inflammatory exposures in a dorsal root ganglion organotypic coculture system...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28096308/-re-building-a-kidney
#9
Leif Oxburgh, Thomas J Carroll, Ondine Cleaver, Daniel R Gossett, Deborah K Hoshizaki, Jeffrey A Hubbell, Benjamin D Humphreys, Sanjay Jain, Jan Jensen, David L Kaplan, Carl Kesselman, Christian J Ketchum, Melissa H Little, Andrew P McMahon, Stuart J Shankland, Jason R Spence, M Todd Valerius, Jason A Wertheim, Oliver Wessely, Ying Zheng, Iain A Drummond
(Re)Building a Kidney is a National Institute of Diabetes and Digestive and Kidney Diseases-led consortium to optimize approaches for the isolation, expansion, and differentiation of appropriate kidney cell types and the integration of these cells into complex structures that replicate human kidney function. The ultimate goals of the consortium are two-fold: to develop and implement strategies for in vitro engineering of replacement kidney tissue, and to devise strategies to stimulate regeneration of nephrons in situ to restore failing kidney function...
January 17, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28095754/3d-co-culture-of-meniscal-cells-and-mesenchymal-stem-cells-in-collagen-type-i-hydrogel-on-a-small-intestinal-matrix-a-pilot-study-towards-equine-meniscus-tissue-engineering
#10
Antje Kremer, Iris Ribitsch, Jenny Reboredo, Julia Dürr, Monika Egerbacher, Florien Jenner, Heike Walles
Meniscal injuries are the most frequently encountered soft tissue injuries in the equine stifle joint. Due to the inherent limited repair potential of meniscal tissue, meniscal injuries do not only affect the meniscus itself but also lead to impaired joint homeostasis and secondary osteoarthritis. The presented study compares 3D co-culture constructs of primary equine mesenchymal stem cells (MSC) and meniscus cells (MC) seeded on three different scaffolds - a cell-laden collagen type I hydrogel (Col I gel), a tissue-derived small intestinal matrix scaffold (SIS-muc) and a combination thereof - for their qualification to be applied for meniscus tissue engineering...
January 18, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28095625/potentiation-of-biological-effects-of-mesenchymal-stem-cells-in-ischemic-conditions-by-melatonin-via-upregulation-of-cellular-prion-protein-expression
#11
Jun Hee Lee, Yong-Seok Han, Sang Hun Lee
Mesenchymal stem cells (MSCs) are promising candidates for stem cell-based therapy in ischemic diseases. However, ischemic injury induces pathophysiological conditions, such as oxidative stress and inflammation, which diminish therapeutic efficacy of MSC-based therapy by reducing survival and functionality of transplanted MSCs. To overcome this problem, we explored the effects of melatonin on the proliferation, resistance to oxidative stress, and immunomodulatory properties of MSCs. Treatment with melatonin enhanced MSC proliferation and self-renewal via upregulation of cellular prion protein (PrP(C) ) expression...
January 17, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28094771/orphan-gpr182-suppresses-erk-mediated-intestinal-proliferation-during-regeneration-and-adenoma-formation
#12
Daniel O Kechele, R Eric Blue, Bailey Zwarycz, Scott T Espenschied, Amanda T Mah, Marni B Siegel, Charles M Perou, Shengli Ding, Scott T Magness, P Kay Lund, Kathleen M Caron
Orphan GPCRs provide an opportunity to identify potential pharmacological targets, yet their expression patterns and physiological functions remain challenging to elucidate. Here, we have used a genetically engineered knockin reporter mouse to map the expression pattern of the Gpr182 during development and adulthood. We observed that Gpr182 is expressed at the crypt base throughout the small intestine, where it is enriched in crypt base columnar stem cells, one of the most active stem cell populations in the body...
January 17, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28094257/pten-is-necessary-for-the-quiescence-and-maintenance-of-adult-muscle-stem-cells
#13
Feng Yue, Pengpeng Bi, Chao Wang, Tizhong Shan, Yaohui Nie, Timothy L Ratliff, Timothy P Gavin, Shihuan Kuang
Satellite cells (SCs) are myogenic stem cells required for regeneration of adult skeletal muscles. A proper balance among quiescence, activation and differentiation is essential for long-term maintenance of SCs and their regenerative function. Here we show a function of Pten (phosphatase and tensin homologue) in quiescent SCs. Deletion of Pten in quiescent SCs leads to their spontaneous activation and premature differentiation without proliferation, resulting in depletion of SC pool and regenerative failure...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28093371/sonographically-guided-knee-meniscus-injections-feasibility-techniques-and-validation
#14
Michael R Baria, Jacob L Sellon, Dan Lueders, Jay Smith
BACKGROUND: There is a growing interest in the use of biologic agents such as platelet-rich plasma and mesenchymal stem/stromal cells to treat musculoskeletal injuries, including meniscal tears. Although prior research has documented the role of diagnostic ultrasound to evaluate meniscal tears, sonographically guided (SG) techniques to specifically deliver therapeutic agents into the meniscus have not been described. OBJECTIVE: To describe and validate SG injection techniques for the body and posterior horn of the medial and lateral meniscus...
January 13, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28093363/alignment-of-collagen-fiber-in-knitted-silk-scaffold-for-functional-massive-rotator-cuff-repair
#15
Zefeng Zheng, Jisheng Ran, Weishan Chen, Yejun Hu, Ting Zhu, Xiao Chen, Zi Yin, Boon Chin Heng, Gang Feng, Huihui Le, Chenqi Tang, Jiayun Huang, Yangwu Chen, Yiting Zhou, Pioletti Dominique, Weiliang Shen, Hong-Wei Ouyang
: Rotator cuff tear is one of the most common types of shoulder injuries, often resulting in pain and physical debilitation. Allogeneic tendon-derived decellularized matrices do not have appropriate pore size and porosity to facilitate cell infiltration, while commercially-available synthetic scaffolds are often inadequate at inducing tenogenic differentiation. The aim of this study is to develop an advanced 3D aligned collagen/silk scaffold (ACS) and investigate its efficacy in a rabbit massive rotator cuff tear model...
January 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28092863/adipose-derived-stem-cells-ameliorate-renal-interstitial-fibrosis-through-inhibition-of-emt-and-inflammatory-response-via-tgf-%C3%AE-1-signaling-pathway
#16
Yan Song, Changliang Peng, Shasha Lv, Jing Cheng, Shanshan Liu, Qing Wen, Guangju Guan, Gang Liu
Adipose-derived stem cells (ADSCs) have been successfully used to treat acute kidney injury or acute renal failure. However, the effect of ADSCs on treating renal interstitial fibrosis remains unknown. Here, we assessed the therapeutic efficacy of ADSCs on renal interstitial fibrosis induced by unilateral ureter obstruction (UUO) and explored the potential mechanisms. After 7days of UUO, rats were injected with ADSCs (5×10(6)) or vehicle via tail vein. We found that ADSCs administration significantly ameliorated renal interstitial fibrosis, the occurrence of epithelial-mesenchymal transition (EMT) and inflammatory response...
January 13, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28092350/long-term-renal-survival-in-patients-undergoing-t-cell-depleted-versus-conventional-hematopoietic-stem-cell-transplants
#17
I G Glezerman, S Devlin, M Maloy, M Bui, E A Jaimes, S A Giralt, A A Jakubowski
Calcineurin inhibitor (CNI)-sparing T-cell depleted (TCD) hematopoietic stem cell transplants (HSCTs) are presumed to be less nephrotoxic than conventional HSCTs. We evaluated incidence and risk factors for kidney failure and chronic kidney disease (CKD) in 231 TCD and 212 conventional HSCT recipients. Kidney failure required a median glomerular filtration rate (GFR) <60 ml/min/1.73 m(2) for ⩾100 days anytime after 180-days post-HSCT. Two-year cumulative incidence (CI) of kidney failure was 42% in the conventional versus 31% in the TCD group (P=0...
January 16, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28089754/stem-cell-therapy-an-emerging-modality-in-glomerular-diseases
#18
REVIEW
Umang G Thakkar, Aruna V Vanikar, Hargovind L Trivedi
The kidney has been considered a highly terminally differentiated organ with low proliferative potential and thus unlikely to undergo regeneration. Glomerular disease progresses to end-stage renal disease (ESRD), which requires dialysis or renal transplantation for better quality of life for patients with ESRD. Because of the shortage of implantable kidneys and complications such as immune rejection, septicemia and toxicity of immunosuppression, kidney transplantation remains a challenge. Therapeutic options available for glomerular disease include symptomatic treatment and strategies to delay progression...
January 12, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28089422/low-magnitude-mechanical-signals-and-the-spine-a-review-of-current-and-future-applications
#19
REVIEW
Martin H Pham, Zorica Buser, Jeffrey C Wang, Frank L Acosta
Animal and human studies demonstrate the anabolic properties of low-magnitude mechanical stimulation (LMMS) in its ability to improve bone formation by enhancing the proliferation of mesenchymal stem cells and their subsequent commitment down an osteoblastic lineage. Response to mechanical strains as low as 10μɛ have been seen, illustrating the sensitivity of mechanosensory cells to mechanotransduction pathways. Applications to the spine include treatment of osteoporosis in preparation for instrumented fusion, fracture reduction in spinal cord injury patients to slow bone mineral density loss, and bone tissue engineering and enhancement of bone-implant osseointegration for pseudarthrosis and hardware failure...
January 12, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28089078/hucmsc-exosome-derived-gpx1-is-required-for-the-recovery-of-hepatic-oxidant-injury
#20
Yongmin Yan, Wenqian Jiang, Youwen Tan, Shengqiang Zou, Hongguang Zhang, Fei Mao, Aihua Gong, Hui Qian, Wenrong Xu
Exosomes are small biological membrane vesicles secreted by various cells, including mesenchymal stem cells (MSCs). We previously reported that MSC-derived exosomes (MSC-Ex) can elicit hepatoprotective effects against toxicant-induced injury. However, the success of MSC-Ex-based therapy for treatment of liver diseases and the underlying mechanisms have not been well characterized. We used human umbilical cord MSC-derived exosome (hucMSC-Ex) administrated by tail vein or oral gavage at different doses and, in engrafted liver mouse models, noted antioxidant and anti-apoptotic effects and rescue from liver failure...
January 6, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
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