Bio

Education & Certifications


  • Bachelor of Arts, Harvard University, Human Dev. & Regenerative Bio. (2012)

Publications

All Publications


  • Referred by Google: mining Trends data to identify patterns in and correlates to searches for dermatologic concerns and providers. The British journal of dermatology Ransohoff, J. D., Sarin, K. Y. 2017

    Abstract

    Google Trends is a powerful tool that provides population-level insight into search volumes by time and geography. Since 2004, Google Trends has been profiled across studies of public interest, disease surveillance, prevention, and compliance.(1,2) Dermatologists have used Trends data to identify seasonal peaks in skin cancer and tanning searches(3,4) Other Google tools, including Health Cards(5) and Reverse Image Searching(6) , have been explored by dermatologists for generating differential diagnoses. This article is protected by copyright. All rights reserved.

    View details for DOI 10.1111/bjd.15491

    View details for PubMedID 28338220

  • Health Cards by Google: dermatologist review of inclusivity and utility of the medical search application. British journal of dermatology Ransohoff, J. D., Sarin, K. Y. 2016

    View details for DOI 10.1111/bjd.15209

    View details for PubMedID 27893155

  • Assessment of Accuracy of Patient-Initiated Differential Diagnosis Generation by Google Reverse Image Searching. JAMA dermatology Ransohoff, J. D., Li, S., Sarin, K. Y. 2016; 152 (10): 1164-1166

    View details for DOI 10.1001/jamadermatol.2016.2096

    View details for PubMedID 27367170

  • CALML5 is a ZNF750-and TINCR-induced protein that binds stratifin to regulate epidermal differentiation GENES & DEVELOPMENT Sun, B. K., Boxer, L. D., Ransohoff, J. D., Siprashvili, Z., Qu, K., Lopez-Pajares, V., Hollmig, S. T., Khavari, P. A. 2015; 29 (21): 2225-2230

    Abstract

    Outward migration of epidermal progenitors occurs with induction of hundreds of differentiation genes, but the identities of all regulators required for this process are unknown. We used laser capture microdissection followed by RNA sequencing to identify calmodulin-like 5 (CALML5) as the most enriched gene in differentiating outer epidermis. CALML5 mRNA was up-regulated by the ZNF750 transcription factor and then stabilized by the long noncoding RNA TINCR. CALML5 knockout impaired differentiation, abolished keratohyalin granules, and disrupted epidermal barrier function. Mass spectrometry identified SFN (stratifin/14-3-3?) as a CALML5-binding protein. CALML5 interacts with SFN in suprabasal epidermis, cocontrols 13% of late differentiation genes, and modulates interaction of SFN to some of its binding partners. A ZNF750-TINCR-CALML5-SFN network is thus essential for epidermal differentiation.

    View details for DOI 10.1101/gad.267708.115

    View details for Web of Science ID 000364853500002

    View details for PubMedID 26545810

    View details for PubMedCentralID PMC4647556

  • Costimulation-Adhesion Blockade is Superior to Cyclosporine A and Prednisone Immunosuppressive Therapy for Preventing Rejection of Differentiated Human Embryonic Stem Cells Following Transplantation Stem Cells Huber*, B. C., Ransohoff*, J. D., Ransohoff, K. J., Riegler, J., Ebert, A., Kodo, K., Gong, Y., Sanchez-Freire, V., Dey, D., Kooreman, N. G., Diecke, S., Zhang, W. Y., Odegaard, J., Hu, S., Gold, J. D., Robbins, R. C., Wu, J. C., (*co-first authors) 2013; 11: 2354-63

    View details for DOI 10.1002/stem.1501

  • Short-Term Immunosuppression Promotes Engraftment of Embryonic and Induced Pluripotent Stem Cells CELL STEM CELL Pearl, J. I., Lee, A. S., Leveson-Gower, D. B., Sun, N., Ghosh, Z., Lan, F., Ransohoff, J., Negrin, R. S., Davis, M. M., Wu, J. C. 2011; 8 (3): 309-317

    Abstract

    Embryonic stem cells (ESCs) are an attractive source for tissue regeneration and repair therapies because they can be differentiated into virtually any cell type in the adult body. However, for this approach to succeed, the transplanted ESCs must survive long enough to generate a therapeutic benefit. A major obstacle facing the engraftment of ESCs is transplant rejection by the immune system. Here we show that blocking leukocyte costimulatory molecules permits ESC engraftment. We demonstrate the success of this immunosuppressive therapy for mouse ESCs, human ESCs, mouse induced pluripotent stem cells (iPSCs), human induced pluripotent stem cells, and more differentiated ESC/(iPSCs) derivatives. Additionally, we provide evidence describing the mechanism by which inhibition of costimulatory molecules suppresses T cell activation. This report describes a short-term immunosuppressive approach capable of inducing engraftment of transplanted ESCs and iPSCs, providing a significant improvement in our mechanistic understanding of the critical role costimulatory molecules play in leukocyte activation.

    View details for DOI 10.1016/j.stem.2011.01.012

    View details for Web of Science ID 000288404400012

    View details for PubMedID 21362570

    View details for PubMedCentralID PMC3061351

  • Tracking gene and cell fate for therapeutic gain Nature Materials Kooreman*, N. G., Ransohoff*, J. D., Wu, J. C., (*co-first authors) 2014; 13: 106-109

    View details for DOI 10.1038/nmat3868

  • Immunogenicity of Pluripotent Stem Cells and Their Derivatives CIRCULATION RESEARCH de Almeida, P. E., Ransohoff, J. D., Nahid, A., Wu, J. C. 2013; 112 (3): 549-561

    Abstract

    The ability of pluripotent stem cells to self-renew and differentiate into all somatic cell types brings great prospects to regenerative medicine and human health. However, before clinical applications, much translational research is necessary to ensure that their therapeutic progenies are functional and nontumorigenic, that they are stable and do not dedifferentiate, and that they do not elicit immune responses that could threaten their survival in vivo. For this, an in-depth understanding of their biology, genetic, and epigenetic make-up and of their antigenic repertoire is critical for predicting their immunogenicity and for developing strategies needed to assure successful long-term engraftment. Recently, the expectation that reprogrammed somatic cells would provide an autologous cell therapy for personalized medicine has been questioned. Induced pluripotent stem cells display several genetic and epigenetic abnormalities that could promote tumorigenicity and immunogenicity in vivo. Understanding the persistence and effects of these abnormalities in induced pluripotent stem cell derivatives is critical to allow clinicians to predict graft fate after transplantation, and to take requisite measures to prevent immune rejection. With clinical trials of pluripotent stem cell therapy on the horizon, the importance of understanding immunologic barriers and devising safe, effective strategies to bypass them is further underscored. This approach to overcome immunologic barriers to stem cell therapy can take advantage of the validated knowledge acquired from decades of hematopoietic stem cell transplantation.

    View details for DOI 10.1161/CIRCRESAHA.111.249243

    View details for Web of Science ID 000314356700022

    View details for PubMedID 23371903

    View details for PubMedCentralID PMC3638957

  • Imaging Stem Cell Therapy for the Treatment of Peripheral Arterial Disease CURRENT VASCULAR PHARMACOLOGY Ransohoff, J. D., Wu, J. C. 2012; 10 (3): 361-373

    Abstract

    Arteriosclerotic cardiovascular diseases are among the leading causes of morbidity and mortality worldwide. Therapeutic angiogenesis aims to treat ischemic myocardial and peripheral tissues by delivery of recombinant proteins, genes, or cells to promote neoangiogenesis. Concerns regarding the safety, side effects, and efficacy of protein and gene transfer studies have led to the development of cell-based therapies as alternative approaches to induce vascular regeneration and to improve function of damaged tissue. Cell-based therapies may be improved by the application of imaging technologies that allow investigators to track the location, engraftment, and survival of the administered cell population. The past decade of investigations has produced promising clinical data regarding cell therapy, but design of trials and evaluation of treatments stand to be improved by emerging insight from imaging studies. Here, we provide an overview of pre-clinical and clinical experience using cell-based therapies to promote vascular regeneration in the treatment of peripheral arterial disease. We also review four major imaging modalities and underscore the importance of in vivo analysis of cell fate for a full understanding of functional outcomes.

    View details for Web of Science ID 000303258600011

    View details for PubMedID 22239638

    View details for PubMedCentralID PMC3683543

  • In Vivo Functional and Transcriptional Profiling of Bone Marrow Stem Cells After Transplantation Into Ischemic Myocardium ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY Sheikh, A. Y., Huber, B. C., Narsinh, K. H., Spin, J. M., van der Bogt, K., de Almeida, P. E., Ransohoff, K. J., Kraft, D. L., Fajardo, G., Ardigo, D., Ransohoff, J., Bernstein, D., Fischbein, M. P., Robbins, R. C., Wu, J. C. 2012; 32 (1): 92-102

    Abstract

    Clinical trials of bone marrow-derived stem cell therapy for the heart have yielded variable results. The basic mechanism(s) that underlies their potential efficacy remains unknown. In the present study, we evaluated the survival kinetics, transcriptional response, and functional outcome of intramyocardial bone marrow mononuclear cell (BMMC) transplantation for cardiac repair in a murine myocardial infarction model.We used bioluminescence imaging and high-throughput transcriptional profiling to evaluate the in vivo survival kinetics and gene expression changes of transplanted BMMCs after their engraftment into ischemic myocardium. Our results demonstrate short-lived survival of cells following transplant, with less than 1% of cells surviving by 6 weeks posttransplantation. Moreover, transcriptomic analysis of BMMCs revealed nonspecific upregulation of various cell regulatory genes, with a marked downregulation of cell differentiation and maturation pathways. BMMC therapy caused limited improvement of heart function as assessed by echocardiography, invasive hemodynamics, and positron emission tomography. Histological evaluation of cell fate further confirmed findings of the in vivo cell tracking and transcriptomic analysis.Collectively, these data suggest that BMMC therapy, in its present iteration, may be less efficacious than once thought. Additional refinement of existing cell delivery protocols should be considered to induce better therapeutic efficacy.

    View details for DOI 10.1161/ATVBAHA.111.238618

    View details for Web of Science ID 000298288700014

    View details for PubMedID 22034515

    View details for PubMedCentralID PMC3241895

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