Michael J. Lenardo, M.D.
Molecular Development of the Immune System Section
Building 10, Room 11N246
10 Center Drive
Bethesda, MD 20892
Our laboratory investigates the molecular regulation of T lymphocytes, particularly as it relates to immunological tolerance, apoptosis, and autoimmune diseases such as multiple sclerosis, type 1 diabetes mellitus, and similar diseases. We use both molecular biology and cellular immunology techniques to pursue these investigations, with a focus on programs of cell death and survival, including apoptosis, autophagy, and necrosis mechanisms. Our approach has been to use contemporary genomic approaches to discover the molecular basis of new genetic diseases of the immune system that affect activation, tolerance, and homeostasis and to develop novel means of diagnosis and immunomodulation of these diseases. Also, we are attempting to pioneer a means of antigen-specific induction of apoptosis of pathogenic T cells as a means of treating autoimmune disease. Such studies could lead to a better understanding of molecular regulatory mechanisms that are important for human immunological diseases.
Credit: NIAIDA model of mature T-cell homeostasis during immune responses
Figure 1: Antigen stimulation activates naïve T lymphocytes to produce cytokines that promote T-cell growth, such as IL-2 and IL-4 (other immunoreactive cells express IL-7 in support). These cytokines drive activated T cells to proliferate. After antigenic stimulation, the activated T cells are subject to population control at multiple levels. First, the presence of regulatory T cells (Treg) can deprive the activated T cells of sufficient growth cytokines and trigger cytokine deprivation-induced apoptosis. Secondly, repeated T-cell receptor (TCR)-stimulation by an antigen can cause TCR re-stimulation-induced cell death (RICD). Lastly, at the end phase of an immune response, lacking IL-2 and other survival cytokines leads activated T cells to undergo cytokine withdrawal-induced apoptosis (CWID). A small fraction of activated T cells may develop into memory T cells provided with appropriate microenvironments. By all means, T cell-dependent immunity and homeostasis are maintained by balancing between proliferation and contraction of antigen-specific T-cell populations.
Dr. Lenardo graduated with a B.A. from the Johns Hopkins University and an M.D. from Washington University, St. Louis. He performed clinical work in internal medicine and research at the University of Iowa and received postdoctoral training at the Whitehead Institute for Biomedical Research at the Massachusetts Institute of Technology. He established an independent research unit in the Laboratory of Immunology in 1989 and became a senior investigator and section chief in 1994. Dr. Lenardo serves on several editorial boards and has given numerous lectures around the world on his work on the molecular regulation of immune homeostasis. His work focuses on lymphocyte apoptosis, autoimmunity, and genomics of the immune system. He was one of the founders of the NIH-Oxford-Cambridge Scholars program for doctoral training and the NIH M.D./Ph.D. partnership program.
Lenardo M, Lo B, Lucas CL. Genomics of Immune Diseases and New Therapies. Annu Rev Immunol. 2016;34:121-49.
Lu W, Zhang Y, McDonald DO, Jing H, Carroll B, Robertson N, Zhang Q, Griffin H, Sanderson S, Lakey JH, Morgan NV, Reynard LN, Zheng L, Murdock HM, Turvey SE, Hackett SJ, Prestidge T, Hall JM, Cant AJ, Matthews HF, Koref MF, Simon AK, Korolchuk VI, Lenardo MJ, Hambleton S, Su HC. Dual proteolytic pathways govern glycolysis and immune competence. Cell. 2014;159(7):1578-90.
Li FY, Chaigne-Delalande B, Su H, Uzel G, Matthews H, Lenardo MJ. XMEN disease: a new primary immunodeficiency affecting Mg2+ regulation of immunity against Epstein-Barr virus. Blood. 2014;123(14):2148-52.
Lo B, Zhang K, Lu W, Zheng L, Zhang Q, Kanellopoulou C, Zhang Y, Liu Z, Fritz JM, Marsh R, Husami A, Kissell D, Nortman S, Chaturvedi V, Haines H, Young LR, Mo J, Filipovich AH, Bleesing JJ, Mustillo P, Stephens M, Rueda CM, Chougnet CA, Hoebe K, McElwee J, Hughes JD, Karakoc-Aydiner E, Matthews HF, Price S, Su HC, Rao VK, Lenardo MJ, Jordan MB. AUTOIMMUNE DISEASE. Patients with LRBA deficiency show CTLA4 loss and immune dysregulation responsive to abatacept therapy. Science. 2015;349(6246):436-40.
Ozen A, Comrie WA, Ardy RC, Domínguez Conde C, Dalgic B, Beser ÖF, Morawski AR, Karakoc-Aydiner E, Tutar E, Baris S, Ozcay F, Serwas NK, Zhang Y, Matthews HF, Pittaluga S, Folio LR, Unlusoy Aksu A, McElwee JJ, Krolo A, Kiykim A, Baris Z, Gulsan M, Ogulur I, Snapper SB, Houwen RHJ, Leavis HL, Ertem D, Kain R, Sari S, Erkan T, Su HC, Boztug K, Lenardo MJ. CD55 Deficiency, Early-Onset Protein-Losing Enteropathy, and Thrombosis. N Engl J Med. 2017;377(1):52-61.
Related Scientific Focus Areas
Molecular Biology and Biochemistry
Genetics and Genomics
This page was last updated on September 11th, 2017