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Stem cells

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Activation of mTOR signaling in adult lung microvascular progenitor cells accelerates lung aging
Emma C. Mason, … , Fabienne Gally, Susan M. Majka
Emma C. Mason, … , Fabienne Gally, Susan M. Majka
Published October 24, 2023
Citation Information: J Clin Invest. 2023. https://doi.org/10.1172/JCI171430.
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Activation of mTOR signaling in adult lung microvascular progenitor cells accelerates lung aging

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Abstract

Reactivation and dysregulation of the mTOR signaling pathway is a hallmark of aging and chronic lung disease, however the impact on microvascular progenitor cells (MVPC), capillary angiostasis and tissue homeostasis is unknown. While the existence of an adult lung vascular progenitor has long been hypothesized, these studies show that Abcg2 enriches for a population of angiogenic tissue resident MVPC present in both adult mouse and human lungs using functional, lineage and transcriptomic analyses. These studies link human and mouse MVPC specific mTORC1 activation to decreased stemness, angiogenic potential, disruption of p53 and Wnt pathways, with consequent loss of alveolar-capillary structure and function. Following mTOR activation these MVPC adapt a unique transcriptome signature and emerge as a venous subpopulation in the angiodiverse microvascular endothelial subclusters. Thus, our findings support a significant role for mTOR in the maintenance of MVPC function, microvascular niche homeostasis as well as a cell-based mechanism driving loss of tissue structure underlying lung aging and the development of emphysema.

Authors

Emma C. Mason, Swapna Menon, Benjamin R. Schneider, Christa F. Gaskill, Maggie M. Dawson, Camille M. Moore, Laura Craig Armstrong, Okyong J. Cho, Bradley W. Richmond, Jonathan A. Kropski, James D. West, Patrick Geraghty, Brigitte N. Gomperts, Kevin C. Ess, Fabienne Gally, Susan M. Majka

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Human endogenous retrovirus K contributes to a stem cell niche in glioblastoma
Ashish H. Shah, … , John D. Heiss, Avindra Nath
Ashish H. Shah, … , John D. Heiss, Avindra Nath
Published July 3, 2023
Citation Information: J Clin Invest. 2023;133(13):e167929. https://doi.org/10.1172/JCI167929.
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Human endogenous retrovirus K contributes to a stem cell niche in glioblastoma

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Abstract

Human endogenous retroviruses (HERVs) are ancestral viral relics that constitute nearly 8% of the human genome. Although normally silenced, the most recently integrated provirus HERV-K (HML-2) can be reactivated in certain cancers. Here, we report pathological expression of HML-2 in malignant gliomas in both cerebrospinal fluid and tumor tissue that was associated with a cancer stem cell phenotype and poor outcomes. Using single-cell RNA-Seq, we identified glioblastoma cellular populations with elevated HML-2 transcripts in neural progenitor–like cells (NPC-like) that drive cellular plasticity. Using CRISPR interference, we demonstrate that HML-2 critically maintained glioblastoma stemness and tumorigenesis in both glioblastoma neurospheres and intracranial orthotopic murine models. Additionally, we demonstrate that HML-2 critically regulated embryonic stem cell programs in NPC-derived astroglia and altered their 3D cellular morphology by activating the nuclear transcription factor OCT4, which binds to an HML-2–specific long-terminal repeat (LTR5Hs). Moreover, we discovered that some glioblastoma cells formed immature retroviral virions, and inhibiting HML-2 expression with antiretroviral drugs reduced reverse transcriptase activity in the extracellular compartment, tumor viability, and pluripotency. Our results suggest that HML-2 fundamentally contributes to the glioblastoma stem cell niche. Because persistence of glioblastoma stem cells is considered responsible for treatment resistance and recurrence, HML-2 may serve as a unique therapeutic target.

Authors

Ashish H. Shah, Sarah R. Rivas, Tara T. Doucet-O’Hare, Vaidya Govindarajan, Catherine DeMarino, Tongguang Wang, Leonel Ampie, Yong Zhang, Yeshavanth Kumar Banasavadi-Siddegowda, Stuart Walbridge, Dragan Maric, Marta Garcia-Montojo, Robert K. Suter, Myoung-Hwa Lee, Kareem A. Zaghloul, Joseph Steiner, Abdel G. Elkahloun, Jay Chandar, Deepa Seetharam, Jelisah Desgraves, Wenxue Li, Kory Johnson, Michael E. Ivan, Ricardo J. Komotar, Mark R. Gilbert, John D. Heiss, Avindra Nath

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Ruxolitinib improves hematopoietic regeneration by restoring mesenchymal stromal cell function in acute graft-versus-host disease
Yan Lin, … , Hui Cheng, Xiaoxia Hu
Yan Lin, … , Hui Cheng, Xiaoxia Hu
Published June 20, 2023
Citation Information: J Clin Invest. 2023. https://doi.org/10.1172/JCI162201.
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Ruxolitinib improves hematopoietic regeneration by restoring mesenchymal stromal cell function in acute graft-versus-host disease

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Abstract

Acute graft-versus-host disease (aGVHD) is a severe complication of allogeneic hematopoietic stem cell transplantation. Hematopoietic dysfunction accompanied by severe aGVHD, which may be caused by niche impairment, is a long-standing clinical problem. However, how the bone marrow (BM) niche is damaged in aGVHD hosts is poorly defined. To comprehensively address this question, we employed a haplo-MHC-matched transplantation aGVHD murine model and performed single-cell RNA sequencing of non-hematopoietic BM cells. Transcriptional analysis showed that BM mesenchymal stromal cells (BMSCs) were severely affected with a reduction in cell ratio, abnormal metabolism, compromised differentiation potential and defective hematopoietic supportive function, which were validated by functional assays. We found that ruxolitinib, a selective JAK1/2 inhibitor, ameliorated aGVHD-related hematopoietic dysfunction through direct effect on recipient BMSCs, resulting in improved proliferation ability, adipogenesis/osteogenesis potential, mitochondrial metabolism capacity and crosstalk with donor-derived hematopoietic stem/progenitor cells. By inhibiting the JAK2/STAT1 pathway, ruxolitinib maintained long-term improvement of aGVHD BMSC function. Additionally, ruxolitinib pretreatment in vitro primed BMSCs to better support donor-derived hematopoiesis in vivo. These observations in the murine model were validated in patient samples. Overall, our findings suggest that ruxolitinib can directly restore BMSC function via JAK2/STAT1 pathway and in turn, improve the hematopoietic dysfunction caused by aGVHD.

Authors

Yan Lin, Quan Gu, Shihong Lu, Zengkai Pan, Zining Yang, Yapu Li, Shangda Yang, Yanling Lv, Zhaofeng Zheng, Guohuan Sun, Fanglin Gou, Chang Xu, Xiangnan Zhao, Fengjiao Wang, Chenchen Wang, Shiru Yuan, Xiaobao Xie, Yang Cao, Yue Liu, Weiying Gu, Tao Cheng, Hui Cheng, Xiaoxia Hu

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iPSC-derived reactive astrocytes from patients with multiple-sclerosis protect cocultured neurons in inflammatory conditions
Janis Kerkering, … , Marlen Alisch, Volker Siffrin
Janis Kerkering, … , Marlen Alisch, Volker Siffrin
Published May 23, 2023
Citation Information: J Clin Invest. 2023. https://doi.org/10.1172/JCI164637.
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iPSC-derived reactive astrocytes from patients with multiple-sclerosis protect cocultured neurons in inflammatory conditions

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Abstract

Multiple sclerosis (MS) is the most common chronic inflammatory disease of the central nervous system (CNS). The individual course is highly variable with complete remission in some patients and relentless courses in others. We generated induced pluripotent stem cells (iPSCs) to investigate possible mechanisms in benign MS (BMS), compared to progressive MS (PMS). We differentiated neurons and astrocytes that were then stressed with inflammatory cytokines typically associated with MS. TNFα/IL-17A treatment increased neurite damage in MS neurons irrespective of clinical phenotypes. In contrast, TNFα/IL-17A-reactive BMS astrocytes cultured with healthy control (HC) neurons exhibited significantly decreased axonal damage, compared to PMS astrocytes. Accordingly, single cell transcriptomic analysis of BMS-astrocyte co-cultured neurons demonstrated upregulated pathways of neuronal resilience, namely these astrocytes revealed differential growth factor expression. Moreover, supernatants from BMS astrocyte-neuron co-cultures rescued TNFα/IL-17-induced neurite damage. This process was associated with the unique expression of the growth factors, LIF and TGF-β1, as induced by TNFα/IL-17 and JAK-STAT activation. Our findings highlight a potential therapeutic role of modulating astrocyte phenotypes that generate a neuroprotective milieu preventing permanent neuronal damage.

Authors

Janis Kerkering, Bakhrom Muinjonov, Kamil Sebastian Rosiewicz, Sebastian Diecke, Charlotte Biese, Juliane Schiweck, Claudia Chien, Dario Zocholl, Thomas Conrad, Friedemann Paul, Marlen Alisch, Volker Siffrin

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1-Deoxynojirimycin promotes cardiac function and rescues mitochondrial cristae in mitochondrial hypertrophic cardiomyopathy
Qianqian Zhuang, … , Zhong Liu, Qingfeng Yan
Qianqian Zhuang, … , Zhong Liu, Qingfeng Yan
Published May 18, 2023
Citation Information: J Clin Invest. 2023. https://doi.org/10.1172/JCI164660.
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1-Deoxynojirimycin promotes cardiac function and rescues mitochondrial cristae in mitochondrial hypertrophic cardiomyopathy

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Abstract

Hypertrophic cardiomyopathy (HCM) is the most prominent cause of sudden cardiac death in young individuals. Due to heterogeneity in the clinical manifestations, conventional HCM drugs have limitations for mitochondrial hypertrophic cardiomyopathy. Discovering more effective compounds would be of substantial benefit for further elucidating the pathogenic mechanisms of HCM and treating patients with this condition. We previously reported the MT-RNR2 variant associated with HCM that results in mitochondrial dysfunction. Here, we screened a mitochondria-associated compound library by quantifying the mitochondrial membrane potential of HCM cybrids and the survival rate of HCM induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) in galactose media. 1-Deoxynojirimycin (DNJ) was identified to rescue mitochondrial function by targeting optic atrophy protein 1 (OPA1) to promote its oligomerization, leading to reconstruction of the mitochondrial cristae. DNJ treatment further recovered the physiological properties of HCM iPSC-CMs by improving Ca2+ homeostasis and electrophysiological properties. An angiotensin II-induced cardiac hypertrophy mouse model further verified the efficacy of DNJ in promoting cardiac mitochondrial function and alleviating cardiac hypertrophy in vivo. These results demonstrated that DNJ could be a potential mitochondrial rescue agent for mitochondrial hypertrophic cardiomyopathy. Our findings will help elucidate the mechanism of HCM and provide a potential therapeutic strategy.

Authors

Qianqian Zhuang, Fengfeng Guo, Lei Fu, Yufei Dong, Shaofang Xie, Xue Ding, Shuangyi Hu, Xuanhao D. Zhou, Yangwei Jiang, Hui Zhou, Yue Qiu, Zhaoying Lei, Mengyao Li, Huajian Cai, Mingjie Fan, Lingjie Sang, Yong Fu, Dong Zhang, Aifu Lin, Xu Li, Tilo Kunath, Ruhong Zhou, Ping Liang, Zhong Liu, Qingfeng Yan

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iPSC–derived retinal pigmented epithelial cells from patients with macular telangiectasia show decreased mitochondrial function
Kevin T. Eade, … , Paul S. Bernstein, Martin Friedlander
Kevin T. Eade, … , Paul S. Bernstein, Martin Friedlander
Published May 1, 2023
Citation Information: J Clin Invest. 2023;133(9):e163771. https://doi.org/10.1172/JCI163771.
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iPSC–derived retinal pigmented epithelial cells from patients with macular telangiectasia show decreased mitochondrial function

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Abstract

Patient-derived induced pluripotent stem cells (iPSCs) provide a powerful tool for identifying cellular and molecular mechanisms of disease. Macular telangiectasia type 2 (MacTel) is a rare, late-onset degenerative retinal disease with an extremely heterogeneous genetic architecture, lending itself to the use of iPSCs. Whole-exome sequencing screens and pedigree analyses have identified rare causative mutations that account for less than 5% of cases. Metabolomic surveys of patient populations and GWAS have linked MacTel to decreased circulating levels of serine and elevated levels of neurotoxic 1-deoxysphingolipids (1-dSLs). However, retina-specific, disease-contributing factors have yet to be identified. Here, we used iPSC-differentiated retinal pigmented epithelial (iRPE) cells derived from donors with or without MacTel to screen for novel cell-intrinsic pathological mechanisms. We show that MacTel iRPE cells mimicked the low serine levels observed in serum from patients with MacTel. Through RNA-Seq and gene set enrichment pathway analysis, we determined that MacTel iRPE cells are enriched in cellular stress pathways and dysregulation of central carbon metabolism. Using respirometry and mitochondrial stress testing, we functionally validated that MacTel iRPE cells had a reduction in mitochondrial function that was independent of defects in serine biosynthesis and 1-dSL accumulation. Thus, we identified phenotypes that may constitute alternative disease mechanisms beyond the known serine/sphingolipid pathway.

Authors

Kevin T. Eade, Brendan Robert E. Ansell, Sarah Giles, Regis Fallon, Sarah Harkins-Perry, Takayuki Nagasaki, Simone Tzaridis, Martina Wallace, Elizabeth A. Mills, Samaneh Farashi, Alec Johnson, Lydia Sauer, Barbara Hart, Elena D. Rubio, Melanie Bahlo, Christian Metallo, Rando Allikmets, Marin L. Gantner, Paul S. Bernstein, Martin Friedlander

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Superenhancer-activation of KLHDC8A drives glioma ciliation and hedgehog signaling
Derrick Lee, … , David R. Raleigh, Jeremy N. Rich
Derrick Lee, … , David R. Raleigh, Jeremy N. Rich
Published November 17, 2022
Citation Information: J Clin Invest. 2022. https://doi.org/10.1172/JCI163592.
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Superenhancer-activation of KLHDC8A drives glioma ciliation and hedgehog signaling

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Abstract

Glioblastoma ranks among the most aggressive and lethal of all human cancers. Self-renewing, highly tumorigenic glioblastoma stem cells (GSCs) contribute to therapeutic resistance and maintain cellular heterogeneity. Here, we interrogated superenhancer landscapes of primary glioblastoma specimens and patient-derived GSCs, revealing a kelch domain-containing gene (KLHDC8A) with a previously unknown function as an epigenetically-driven oncogene. Targeting KLHDC8A decreased GSC proliferation and self-renewal, induced apoptosis, and impaired in vivo tumor growth. Transcription factor control circuitry analyses revealed that the master transcriptional regulator SOX2 stimulated KLHDC8A expression. Mechanistically, KLHDC8A bound Chaperonin-Containing TCP1 (CCT) to promote assembly of primary cilia to activate Hedgehog signaling. KLHDC8A expression correlated with Aurora B/C Kinase inhibitor activity, which induced primary cilia and Hedgehog signaling. Combinatorial targeting of Aurora B/C Kinase and Hedgehog displayed augmented benefit against GSC proliferation. Collectively, superenhancer-based discovery revealed KLHDC8A as a novel molecular target of cancer stem cells that promotes ciliogenesis to activate the Hedgehog pathway, offering insights into therapeutic vulnerabilities for glioblastoma treatment.

Authors

Derrick Lee, Ryan C. Gimple, Xujia Wu, Briana C. Prager, Zhixin Qiu, Qiulian Wu, Vikas Daggubati, Aruljothi Mariappan, Jay Gopalakrishnan, Matthew R. Sarkisian, David R. Raleigh, Jeremy N. Rich

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Neonatal hyperoxia in mice triggers long-term cognitive deficits via impairments in cerebrovascular function and neurogenesis
Marissa A. Lithopoulos, … , Baptiste Lacoste, Bernard Thébaud
Marissa A. Lithopoulos, … , Baptiste Lacoste, Bernard Thébaud
Published September 22, 2022
Citation Information: J Clin Invest. 2022. https://doi.org/10.1172/JCI146095.
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Neonatal hyperoxia in mice triggers long-term cognitive deficits via impairments in cerebrovascular function and neurogenesis

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Abstract

Preterm birth is the leading cause of death in children under 5 years of age. Premature infants who receive life-saving oxygen therapy often develop bronchopulmonary dysplasia (BPD), a chronic lung disease. Infants with BPD are at a high risk of abnormal neurodevelopment, including motor and cognitive difficulties. While neural progenitor cells (NPCs) are crucial for proper brain development, it is unclear whether they play a role in BPD-associated neurodevelopmental deficits. Here, we showed that hyperoxia-induced experimental BPD in newborn mice led to life-long impairments in cerebrovascular structure and function, as well as impairments in NPC self-renewal and neurogenesis. A neurosphere assay utilizing non-human primate preterm baboon NPCs confirmed impairment in NPC function. Moreover, gene expression profiling revealed that genes involved in cell proliferation, angiogenesis, vascular autoregulation, neuronal formation, and neurotransmission were dysregulated following neonatal hyperoxia. These impairments were associated with motor and cognitive decline in aging hyperoxia-exposed mice, reminiscent of deficits observed in patients with BPD. Altogether, our findings established a relationship between BPD and abnormal neurodevelopmental outcomes and identified molecular and cellular players of neonatal brain injury that persist throughout adulthood, that may be targeted for early intervention to aid this vulnerable patient population.

Authors

Marissa A. Lithopoulos, Xavier Toussay, Shumei Zhong, Liqun Xu, Shamimunisa B. Mustafa, Julie Ouellette, Moises Freitas-Andrade, Cesar C. Comin, Hayam A. Bassam, Adam N. Baker, Yiren Sun, Michael Wakem, Alvaro G. Moreira, Cynthia L. Blanco, Arul Vadivel, Catherine Tsilfidis, Steven R. Seidner, Ruth S. Slack, Diane C. Lagace, Jing Wang, Baptiste Lacoste, Bernard Thébaud

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A Mitofusin 2 – Hif1α axis sets a maturation checkpoint in regenerating skeletal muscle
Xun Wang, … , Chunyu Cai, Prashant Mishra
Xun Wang, … , Chunyu Cai, Prashant Mishra
Published September 20, 2022
Citation Information: J Clin Invest. 2022. https://doi.org/10.1172/JCI161638.
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A Mitofusin 2 – Hif1α axis sets a maturation checkpoint in regenerating skeletal muscle

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Abstract

A fundamental issue in regenerative medicine is whether there exist endogenous regulatory mechanisms that limit the speed and efficiency of the repair process. We report the existence of a maturation checkpoint during muscle regeneration which pauses myofibers at a neonatal stage. This checkpoint is regulated by the mitochondrial protein mitofusin 2 (Mfn2), whose expression is activated in response to muscle injury. Mfn2 is required for growth and maturation of regenerating myofibers; in the absence of Mfn2, new myofibers arrested at a neonatal stage, characterized by centrally nucleated myofibers and loss of H3K27me3 repressive marks at the neonatal myosin heavy chain gene. A similar arrest at the neonatal stage was observed in infantile cases of human centronuclear myopathy. Mechanistically, Mfn2 upregulation suppressed expression of Hypoxia-induced Factor 1α (Hif1α), which is induced in the setting of muscle damage. Sustained Hif1α signaling blocked maturation of new myofibers at the neonatal-to-adult fate transition, revealing the existence of a checkpoint that delays muscle regeneration. Correspondingly, inhibition of Hif1α allowed myofibers to bypass the checkpoint, thereby accelerating the repair process. We conclude that skeletal muscle contains a regenerative checkpoint which regulates the speed of myofiber maturation in response to Mitofusin 2 and Hif1α activity.

Authors

Xun Wang, Yuemeng Jia, Jiawei Zhao, Nicholas P. Lesner, Cameron J. Menezes, Spencer D. Shelton, Siva Sai Krishna Venigalla, Jian Xu, Chunyu Cai, Prashant Mishra

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R-spondin-YAP axis promotes gastric oxyntic gland regeneration and Helicobacter pylori-associated metaplasia in mice
Anne-Sophie Fischer, … , Frank Tacke, Michael Sigal
Anne-Sophie Fischer, … , Frank Tacke, Michael Sigal
Published September 13, 2022
Citation Information: J Clin Invest. 2022. https://doi.org/10.1172/JCI151363.
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R-spondin-YAP axis promotes gastric oxyntic gland regeneration and Helicobacter pylori-associated metaplasia in mice

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Abstract

The stomach corpus epithelium is organized into anatomical units that consist of glands and pits and contain different specialized secretory cells. Acute and chronic injury of the corpus are associated with characteristic changes of cellular differentiation and proliferation. Processes that control cellular differentiation under homeostatic conditions and upon injury are not well understood. R-spondin 3 (Rspo3) is a Wnt signalling enhancer secreted by gastric stromal cells, which controls stem cell homeostasis in different organs. Here we investigated the function of Rspo3 in the corpus during homeostasis, acute injury, and H. pylori infection. Using organoid culture and conditional mouse models, we demonstrate that RSPO3 is a critical driver of secretory cell differentiation in the corpus gland towards parietal and chief cells, while its absence promoted pit cell differentiation. Acute loss of chief and parietal cells induced by high dose tamoxifen - or merely the depletion of LGR5+ chief cells – caused an upregulation of RSPO3 expression, which was required for the initiation of a coordinated regenerative response via the activation of yes-associated protein (YAP) signaling. This response enabled a rapid recovery of the injured secretory gland cells. However, in the context of chronic H. pylori infection, the R-spondin-driven regeneraton was maintained long-term, promoing severe glandular hyperproliferation and the development of premalignant metaplasia.

Authors

Anne-Sophie Fischer, Stefanie Müllerke, Alexander Arnold, Julian Heuberger, Hilmar Berger, Manqiang Lin, Hans-Joachim Mollenkopf, Jonas Wizenty, David Horst, Frank Tacke, Michael Sigal

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