Shadmehr (Shawn) Demehri, M.D., Ph.D.

Demehri Lab

The focus of the Demehri laboratory is to determine the role of the immune system in regulating the early stages of cancer development in order to harness its anti-tumor potential for cancer treatment and prevention.

Overview

Shadmehr (Shawn) Demehri, M.D., Ph.D.
Assistant Professor of Dermatology
Massachusetts General Hospital Cancer Center
Harvard Medical School

Research Summary

The focus of the Demehri laboratory is to determine the role of the immune system in regulating the early stages of cancer development in order to harness its anti-tumor potential for cancer prevention and treatment. To date, several cancer immunotherapies have been developed with proven efficacy against late-stage cancers; however, the role of the immune system in preventing the early development of cancer remains uncertain. The research in our laboratory is focused on identifying the immune mechanisms that drive an immune activation sufficient to prevent cancer formation from pre-cancerous lesions. This approach raises a great opportunity to discover novel immune pathways that can be leveraged in cancer therapy and prevention.

Immune Regulation of Cancer Development

Immune Regulation of Cancer Development

Read the Demehri Annual Report in Full

Group Members

Shadmehr (Shawn) Demehri, M.D., Ph.D.
Assistant Professor
Massachusetts General Hospital
Harvard Medical School

B.S.: Biology, Washington State University
M.D.: Washington University in St. Louis
Ph.D.: Cell and Molecular Biology, Washington University in St. Louis
Residency: Dermatology, Barnes Jewish Hospital/ Washington University
Postdoctoral Fellowship: Immunology, Washington University in St. Louis

 


  • Amir Ameri

    Howard Hughes Medical Institute Medical Research Fellow

    B.S.: (Distinction), Molecular, Cellular, and Developmental Biology Intensive Major, Yale College
    M.D.: Harvard Medical School (in progress)

    Amir received his B.S. in Molecular, Cellular, and Developmental Biology from Yale College. At Yale, he developed a protocol for the synthesis of manganese-based MRI contrast agents for cell tracking and epitope identification. He also studied the role of the tumor suppressor gene, RASSF1A, and oncogene, CTNNB1, in the progression of adrenocortical carcinoma. At the National Cancer Institute, he helped identify a key signaling molecule downstream of the TWEAK – Fn14 pathway that plays a critical role in the promotion of prostate cancer bone metastasis. At Harvard Medical School, he used drug screens to distinguish the PI3K/AKT and Notch signaling pathways as vulnerable targets in breast circulating tumor cell lines. He also used CRISPR - Cas9 genome editing to demonstrate the role of the mTORC1 pathway’s amino acid-sensing arm in the progression of acute leukemia. In the Demehri Laboratory, he is investigating the mechanism of cancer promotion in the context of chronic inflammation.


  • Mary Awad

    Medical Student

    B.S.: Biochemistry, Molecular and Cellular Biology University of New Hampshire (UNH)
    M.D.: candidate 2020 University of Massachusetts Medical School (UMMS)

    Mary is currently pursuing her medical degree at the University of Massachusetts Medical School. She previously studied the role of master transcription factors on the epigenetic landscape of varying pediatric cancers at MGH. Mary hopes to leverage her cancer and biochemistry background to better understand the role of the Human Papilloma Virus and the oncogenesis of non-melanoma skin cancers.


  • Margherita Boieri, Ph.D.

    Postdoctoral Fellow

    B.Sc.: Biotechnology, University of Turin, Italy
    M.Sc.: Medical biotechnologies, Regenerative Medicine, University of Florence, Italy
    Ph.D.: Immunology, University of Oslo, Norway

    Margherita received her PhD in immunology studying how NK cells pre-activated in vitro with IL-12, IL-15, and IL-18 can be used as therapeutic tool to treat T-cell acute lymphoblastic leukemia in animal models. In a parallel project, she studied the contribution of the different Th population to the development of experimental acute GvHD in animal models. She plans to focus her studies into the role of CD4+ T cells and NK cells in antitumor immunity.


  • Mark Bunting, Ph.D.

    Postdoctoral Fellow

    B.S.: Biomedical Science, The University of Adelaide, Australia
    B.S. (Honours): Immunology, The University of Adelaide, Australia
    Ph.D.: Immunology, The University of Adelaide, Australia

    Mark obtained his Ph.D. in chemokine biology focusing on the atypical decoy chemokine receptor, ACKR4/CCX-CKR. ACKR4 expression in the skin was found to be critical for robust trafficking of antigen-loaded dendritic cells to the lymphatic endothelium while thymic ACKR4 expression was required for normal thymocyte development. The absence of ACKR4 led to development of a Sjögren’s syndrome-like disease. Mark then worked as a postdoctoral fellow in the Bone Marrow Transplantation laboratory at QIMR in Brisbane, Australia to understand how graft-versus-host disease impacts NK cell reconstitution post-transplant and the contribution of mucosal innate lymphoid cells to providing protection from this disease. His current work in the Demehri laboratory is focused on NK cell activation and tumor immunity.


  • Scarlett (Se Yun) Cheon

    Research Technician

    B.A.: Wellesley College

    Scarlett has recently received her B.A. degree in Biological Sciences from Wellesley College. She has previously worked in Knoechel lab, a cancer epigenetic lab, at Dana Farber Cancer Institute/Boston Children’s Hospital and Fusco lab at MGH/HMS. In Fusco lab, she worked on identifying host factors that are required in interferon antiviral response post viral subversion points through in vitro and in vivo models for dengue/zika viruses. In Demehri lab, Scarlett is studying the mechanism of NK and other immune cells activation in the skin.


  • Danielle Conrad

    Research Technician (Lab Manager)

    B.A.: Anthropology, University of Cincinnati
    B.A.: Archaeology, University of Cincinnati
    B.S.: Biological Science, University of Rhode Island

    Danielle joined Demehri lab as a recent Biological Science graduate from URI. With a background in healthcare, she will be assisting with the clinical aspects of the laboratory research and working with other lab members on their research projects while further developing her own skills and techniques. She is interested in studying the role genetics play in cancer development and treatment..


  • Kaitlin Dempsey

    Research Technician

    B.A.: Biochemistry, Smith College
    M.S.: Human Physiology, Boston University

    Katie comes to our lab having recently completed a Master of Science degree in Human Physiology from Boston University. Though her background is in clinical research and patient care, she hopes to gain laboratory experience and advance her skills to further contribute to laboratory studies. She looks to apply her interest in genetics to the field of cancer biology, immunology and gain knowledge of the innate immune system’s role in cancer.


  • Tatsuya Hasegawa, Ph.D.

    Research Fellow

    B.S.: Pharmacy, Kanazawa University
    Ph.D.: Pharmacy, Kanazawa University

    Tatsuya received his Ph.D. degree in Pharmacy in 2008 studying the role of antioxidants compounds from E. globulus and Sasa kurilensis as anti-inflammatory as well as anti-melanogenesis agents. During his postdoctoral training, Tatsuya studied the role of inflammasome and autophagy in skin inflammatory responses. He is interested in understanding the changes in skin immunity in response to cellular damage like UV radiation.


  • Sanne Kroon

    Graduate Student

    B.Sc.: Bio-Pharmaceutical Sciences (Biotherapeutics), Leiden University (Degree in progress)

    Sanne is currently pursuing her Master of Science degree in Bio-Pharmaceutical Sciences (Biotherapeutics) at Leiden University. She previously studied the immune response in atherosclerosis at the Leiden Academic Centre for Drug Research. In the Demehri lab, Sanne is participating in the efforts to study breast cancer immunoprevention.


  • Tiancheng Li, M.D.

    Research Fellow

    Bachelor of Medicine: Clinical Medicine, Dalian Medical University, China
    Master of Medicine: Otolaryngology Head and Neck Surgery, Peking University Health Science Center, China
    M.D: Otolaryngology Head and Neck Surgery, Peking University Health Science Center, China

    Tiancheng specialize in head and neck carcinoma. At Peking University, he has directed research projects on 1) studying Cetuximab hypersensitivity reaction and the effect of this hypersensitivity reaction on head, neck and colorectal cancer prognosis (basic research); and 2) applied research on a new endoscopic assisted hidden incision in the parotid gland tumor Surgery (clinical research). Currently, Tiancheng is supported by the China Scholarship Council to expand his research into the field of cancer immunology. In the Demehri laboratory, he is mainly investigating the role of the immune response to Human Papilloma Virus in cancer development.


  • Jonathan Messerschmidt

    Research Technician

    B.A.: Biochemistry and Molecular Biology (Honors, Summa Cum Laude)

    Jon is a recent graduate of the Biochemistry and Molecular Biology program at Boston University. He started his research career at Lankenau Institute for Medical Research studying the effects of indoleamine 2,3-dioxygenase 2 (IDO2) in the development and progression of autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus. At Boston University, he characterized a novel multiple cysteine cluster Toll-Like Receptor and discovered the first pathogen in a coral immunity model organism. Jon hopes to take the insight and technical skills he develops in Demehri lab onto his future career as an oncologist. In addition to treating patients, he plans to study methods of immune modulation in solid tumors to develop novel therapeutics for cancer treatment. Jon has joined the research efforts into role of chronic inflammation in cancer promotion.


  • Kenneth Ngo

    Research Technician

    B.S.: Biomedical Sciences, Boston University
    Research Animal Specialist: Boston University

    Ken joined our lab as a BU student with strong interest in the field of cancer biology and immunology. In the upcoming months, he will be assisting the Demehri lab in the effort to identify the factors in a Th2 immune environment that are critical for suppression of early stages of cancer development. He hopes to pursue a master in bioinformatics, so that he can further advance his skill set and contribute to the research in the lab.


  • Jongho Park, Ph.D.

    Postdoctoral Fellow

    B.Sc.: Computer Science Engineering and Biomedical Science, Pusan National University, Pusan, Korea
    M.S. & Ph.D.: Biological Science, Seoul National University, Seoul, Korea

    Jongho received his Ph.D. in biological science in 2016 studying protein modifications, such as ubiquitination and SUMOylation. He demonstrated a novel post-translational modification of tumor suppressor DBC1 and p53 induced by DNA damage, which can lead to upregulation of their suppressor activity. During his work in industry, Jongho has investigated the mechanism of rare genetic diseases, such as hemophilia, for the development of new therapeutic antibodies. His current work in the Demehri laboratory is focused on molecular signaling pathway within keratinocyte that can govern skin cancer immunity.


  • Marta Requesens Rueda

    Graduate Student

    B.Sc.: Biochemistry, University of Barcelona (UB
    M.S.: Medical and Pharmaceutical Drug Innovation, University of Groningen (RUG; Degree in progress)

    After graduating with a biochemistry degree, Marta is currently pursuing her master’s degree at the University of Groningen (The Netherlands). She is passionate about translational research in the fields of immunology and cancer biology. Marta previously investigated the role of PD-L1 on tumor cell metabolism and metastasis. In the Demehri lab, she is focused on studying the mechanisms of NK cell activation in peripheral tissues for its further application to cancer immunotherapy.


  • Erik Schiferle

    Research Technician

    B.A.: English/Pre-Med, Columbia University
    M.S.: Materials Science and Engineering (Biomaterials), Boston University (Degree in process)

    Erik joined our lab as a student pursuing his Master of Science degree in Materials Science and Engineering (Biomaterials) from Boston University. He has been involved in research at the Physiology and Biophysics Department of the University at Buffalo and the Ames National lab. Erik has joined our research effort into understanding the role of NK cells in tumor immunity and assists in other laboratory studies on cancer immunology.


  • Maulik Vyas, Ph.D.

    Postdoctoral Fellow

    B.Sc. (Honors): Biomedical Science, University of Central Lancashire, UK
    M.Sc.: Cancer Immunology & Biotechnology, University of Nottingham, UK
    Ph.D.: Cancer Immunotherapy, University of Cologne, Germany

    Maulik received his PhD in the field of Cancer Immunotherapy in 2016 where his work focused on designing and developing recombinant trispecific immunoligands (“triplebodies”) to harness NK cells against leukemia. His triplebodies showed successful retargeting of NKG2D-dependent NK cell response against primary leukemia cells in both, allogeneic and autologous settings. Significant in vivo potency of the triplebody was observed in immunodeficient (NSG) mouse model which further suggested its therapeutic potential. Maulik then worked as a postdoctoral fellow at Philipps University Marburg, Germany to study the NK cell suppression in response to soluble NKG2D-ligands or other yet unknown factors present within the ascites of ovarian cancer patients. His current work in the Demehri laboratory is focused on understanding how immune cells, in particular NK cells, regulate the early stages of cancer development.


Alumni:
Trevor Cunningham
Roy Feng, M.D.
Aeden Ghebreselassie, MSN, NP-C
Sophia Lee
Kaiwen Li, M.D.
Elena Lopez
Sara Moradi Tuchayi, M.D., M.P.H.
Anniek Zaalberg
Anna Zemel, Ph.D.

Research Projects

The field of cancer immunology has made substantial advances in recent years by deciphering the role of the tumor infiltrating CD8+ cytotoxic T lymphocytes (CTLs) in attacking cancer cells, which have led to promising new cancer immunotherapeutics. The current immunotherapeutic approaches, however, are largely designed to boost the anti-tumor immune response that has already formed against late-stage metastatic cancers. Therefore, the current cancer immunotherapies like immune checkpoint blockade, which rely on a pre-existing CTL infiltrate in the tumor for their effects, are proven ineffective to treat cancers that frequently lack a significant anti-tumor immune infiltrate, especially during the early in-situ phases of their development. In order to expand the potential of cancer immunotherapy, our laboratory studies the pathways that lead to immune system activation against early phases of cancer development. Devising a mechanism to activate the immune system against early-stage cancers has clear immunopreventive implications by directly blocking the cancer promotion and immunotherapeutic benefits by potentiating the immunity against late disease.

 

CD4 T cell mediated immunity against breast carcinogenesis
CD4+ T cell-mediated immunity against breast cancer development


To pursue this goal, our laboratory is currently focused on three areas of research:

(1) Mechanisms of CD4+ T cell activation against cancer. Our laboratory has studied the mechanism of thymic stromal lymphopoietin (TSLP) in evoking tumor suppression. TSLP is an epithelial-derived cytokine that plays a central role in stimulating CD4+ T helper 2 (Th2)-mediated allergic diseases like atopic dermatitis and asthma. We have shown that high TSLP levels establish a dominant anti-tumorigenic immune environment preventing cancer promotion. Currently, our team investigates the detailed mechanism of TSLP anti-tumor function against solid cancers and examines its application for the treatment of pre-cancerous skin and breast lesions in patients.

(2) Mechanisms of natural killer (NK) cell recruitment and activation against cancer. NK cells are known for their potent anti-tumor properties. However, their role in controlling the cancer development in vivo remains unclear. Our laboratory is utilizing a virally encoded ligand for NK cells to determine the combination of signals necessary to activate NK cells against early stages of carcinogenesis and to identify the mechanism of anti-tumor immunity mounted by the activated NK cells in order to block cancer promotion and progression.

(3) Mechanisms of tumor promotion by the immune system. Although immune cells can mount anti-tumor immunity against cancer, they are also implicated in promoting cancer development under certain conditions. Chronic inflammation is one of the conditions that can predispose patients to cancer; however, the mechanism of such immune-mediated tumor promotion is unclear. To determine this mechanism, our laboratory studies skin and colorectal cancer development as ideal cancer models in which the spatial and temporal relationship between inflammation and cancer development can be determined with exceptional precision. We are currently investigating the immune mechanisms that promote skin cancer development in the context of chronic allergic contact dermatitis and cutaneous lupus and colorectal cancer development in the context inflammatory bowel disease.

Research Positions

Postdoctoral Research Fellow position is available for a highly motivated individual with expertise in immunology, cancer biology and genomics. Expertise in biochemical, immunological and mice experimentations are required for this position.

Interested candidates should send their information including CV and the name of 2-3 references to Dr. Shawn Demehri: sdemehri1@mgh.harvard.edu

Select Publications

For the full list of publications from the Demehri lab, please visit PubMed here.

Select publications:

Ameri AH, Moradi Tuchayi S, Zaalberg A, Park JH, Ngo KH, Li T, Lopez E, Colonna M, Lee RT, Mino-Kenudson M, Demehri S. IL-33/regulatory T cell axis triggers the development of a tumor-promoting immune environment in chronic inflammation. Proceedings of the National Academy of Sciences of the United States of America. 2019. Epub 2019/01/31. doi: 10.1073/pnas.1815016116.

Zaalberg A, MoradiTuchayi S, Ameri AH, Ngo KH, Cunningham TJ, Eliane JP, Livneh M, Horn TD, Rosman IS, Musiek A, Anadkat MJ, Demehri SChronic inflammation promotes skin carcinogenesis in cancer-prone discoid lupus erythematosus. The Journal of investigative dermatology. 2018Jul 17. pii: S0022-202X(18)32328-5.

Cunningham, T.J., Tabacchi, M., Eliane, J.P., Tuchayi, S.M., Manivasagam, S., Mirzaalian, H., Turkoz, A., Kopan, R., Schaffer, A., Saavedra, A.P., Wallendorf, M., Cornelius, L.A., and Demehri, S. Randomized trial of calcipotriol combined with 5-fluorouracil for skin cancer precursor immunotherapy. J Clin Invest 2017; 127(1): 106-116.

Demehri, S., Cunningham, T.J., Manivasagam, S., Ngo, K.H., Moradi Tuchayi, S., Reddy, R., Meyers, M.A., DeNardo, D.G., and Yokoyama, W.M. Thymic stromal lymphopoietin blocks early stages of breast carcinogenesis. J Clin Invest 2016; 126(4): 1458-70.

Demehri, S., Turkoz, A., Manivasagam, S., Yockey, L.J., Turkoz, M., and Kopan, R. Elevated epidermal thymic stromal lymphopoietin levels establish an antitumor environment in the skin. Cancer Cell 2012; 22(4): 494-505.

Demehri, S., Turkoz, A., and Kopan, R. Epidermal Notch1 loss promotes skin tumorigenesis by impacting the stromal microenvironment. Cancer Cell 2009; 16(1): 55-66.

Demehri, S., Morimoto, M., Holtzman, M.J., and Kopan, R. Skin-derived TSLP triggers progression from epidermal-barrier defects to asthma. PLoS Biol 2009; 7(5): e1000067.

 

Contact

Our laboratory is located at the MGH-Charlestown Navy Yard, a historic neighborhood in Boston!

Mailing Address:

Demehri Lab
Cutaneous Biology Research Center
Building 149 13th Street, 3rd floor
Charlestown MA 02129
Phone: 617-724-8128
Email: sdemehri1@mgh.harvard.edu

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