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See https://www.med.upenn.edu/CSTL/ for more information.Research interests:Elucidating the etiology, dysregulated cell types, signaling pathways, and effector cytokines in idiopathic multicentric Castleman disease (iMCD) and related cytokine storm disorders; identifying effective treatments for iMCD patients; PI3K/Akt/mTOR signaling in iMCD; role of stromal cells and chemokines in iMCD; methods for accelerating drug development and drug repurposingKeywords:IL-6, cytokine storm, stromal cells; chemokines, PI3K/Akt/mTORResearch summary:1) Elucidating the etiology, dysregulated cell types, signaling pathways, and effector cytokines in idiopathic multicentric Castleman disease (iMCD) and related cytokine storm disordersiMCD is a poorly-understood and deadly hematologic disorder. A proinflammatory cytokine storm and reactive lymphoproliferation occur for an unknown etiology. The poor understanding of etiology and pathogenesis has limited the development of effective treatments and contributed to the significant morbidity and mortality associated with iMCD (55-77% 5-year overall survival). Currently, we leverage a variety of techniques to study the etiology and pathogenesis of iMCD. In addition, we leverage a biobank (CastleBank) to collect samples to fuel our translational research.2) Identifying effective treatments for iMCD patientsThe poor understanding of iMCD pathogenesis has slowed the development of treatment approaches. Currently, there is only one FDA-approved treatment for iMCD, which is effective in approximately one-third or patients. We run an international Natural History Study of Castleman Disease (ACCELERATE) to collect in-depth data on patients around the world to identify effective treatment approaches currently being used off-label.3) PI3K/Akt/mTOR signaling in iMCDProteomic, flow cytometric, and immunostaining studies revealed upregulation of Vascular Endothelial Growth Factor (VEGF), activated CD8+ T cells, and uncontrolled PI3K/Akt/mTOR signaling in iMCD. Whole genome sequencing of an iMCD patient and both parents revealed rare compound heterozygous missense mutations in both alleles of a negative regulator of T cell activation and a candidate etiological mechanism. These novel findings led to the first-ever use of sirolimus in iMCD and a prolonged remission for a refractory patient (manuscript in submission). Drawing upon the world’s largest collection of iMCD patients and their biospecimens in ACCELERATE, we are employing whole genome sequencing, transcriptomics, proteomics, flow cytometry and phospho-flow, and cellular signaling assays to continue to elucidate the role of PI3K/Akt/mTOR signaling in iMCD. As there are no animal models, we are also performing extensive correlative studies to quantify changes in VEGF, T cell activation, PI3K/Akt/mTOR signaling, and other immunological markers following in vivo sirolimus administration to patients and documenting treatment efficacy. 4) Investigating the role of stromal cells and chemokines in iMCDQuantification of 1,129 plasma proteins in iMCD revealed highly up-regulated acute phase reactants and chemokines. The chemokines that were most upregulated are essential for normal lymph node morphology/function and typically produced by lymph node stromal cells. The most up-regulated chemokine, CXCL13, is responsible for homing B cells into the germinal center. This is interesting, because the pathological hallmark of iMCD is dysmorphic lymph node germinal centers with either too few (atrophic) or too many B cells (hyperplastic). Immunohistochemistry confirmed significantly increased germinal center expression of CXCL13. We are exploring the mechanisms of lymph node stromal cell activation and chemokine signaling.Rotation Projects are available in all areas Lab personnel:Josh Brandstadter, MD, PhD, Director of Clinical ResearchMelanie Mumau, PhD, Associate Director of Translational ResearchMichael Gonzalez, PhD, Associate Director of Computational ResearchDaniel Korn, PhD, Data ScientistTracey Sikora, Associate Director of Drug RepurposingBridget Austin, Biobank Program ManagerAbiola Irvine, Research SpecialistIra Miller, Research SpecialistSaishravan Shyamsundar, Data AnalystMateo Sarmiento Bustamante, Data AnalystCriswell Lavery, Research Administration CoordinatorAmber Cohen, Executive AdministratorBrent Shaw, Medical Communications FellowSally Nijim, 2023-2024 Biomedical Leadership Fellow, MS3The Center for Cytokine Storm Treatment & Laboratory and Fajgenbaum Lab are currently searching for multiple new roles. Visit https://www.cstlupenn.org/joinus for more information.
Luke Y. C. Chen, Brian F. Skinnider, Don Wilson, David C. Fajgenbaum: Adrenalitis and anasarca in idiopathic multicentric Castleman’s disease The Lancet. 397 (10286): 1749,2021..
Sheila K. Pierson, Sushila Shenoy, Ana B. Oromendia, Alexander Gorzewski, Ruth-Anne Langan, Christopher Shield Nabel, Jason R Ruth, Sophia A. T. Parente, Daniel J. Arenas, Mary Guilfoyle, Manjula Reddy, Michael Weinblatt, Nancy Shadick, Mark Bower, Alessia Dalla Pria, Yasufumi Masaki, Laura Katz, Jason Mezey, Philip Beineke, David Lee, Craig Tendler, Taku Kambayashi, Alexander Fossa, Frits van Rhee, David C. Fajgenbaum: Discovery and validation of a novel subgroup and therapeutic target in idiopathic multicentric Castleman disease Blood Advances. 5 (17): 3445-3456,2021..
David C. Fajgenbaum & Carl H. June: Cytokine Storm New England Journal of Medicine. 383 (23): 2255–2273,2020.
Daniel J. Arenas, Katherine Floess, Dale Kobrin, Ruth-Anne Langan Pai, Maya B. Srkalovic, Mark-Avery Tamakloe, Rozena Rasheed, Jasira Ziglar, Johnson Khor, Sophia A. T. Parente, Sheila K. Pierson, Daniel Martinez, Gerald B. Wertheim, Taku Kambayashi, Joseph Baur, David T. Teachey, David C. Fajgenbaum: Increased mTOR activation in idiopathic multicentric Castleman disease Blood. 135 (19): 1673–1684,2020..
Sheila K. Pierson, Johnson S. Khor, Jasira Ziglar, Amy Liu, Katherine Floess, Erin NaPier, Alexander Gorzewski, Mark-Avery Tamakloe, Victoria Powers, Faizaan Akhter, Eric Haljasmaa, Raj Jayanthan, Arthur Rubenstein, Mileva Repasky, Kojo Elenitoba-Johnson, Jason Ruth, Bette Jacobs, Matthew Streetly, Linus Angenendt, Jose Luis Patier, Simone Ferrero, Pier Luigi Zinzani, Louis Terriou, Corey Casper, Elaine Jaffe, Christian Hoffmann, Eric Oksenhendler, Alexander Fossa, Gordan Srkalovic, Amy Chadburn, Thomas S. Uldrick, Megan Lim, Frits van Rhee, David C. Fajgenbaum: ACCELERATE: A Patient-Powered Natural History Study Design Enabling Clinical and Therapeutic Discoveries in a Rare Disorder Cell Reports Medicine. 1 (9): 100158,2020..
Ruth-Anne Langan Pai, Alberto Sada Japp, Michael Gonzalez, Rozena F. Rasheed, Mariko Okumura, Daniel Arenas, Sheila K. Pierson, Victoria Powers, Awo Akosua Kesewa Layman, Charlly Kao, Hakon Hakonarson, Frits van Rhee, Michael R. Betts, Taku Kambayashi, David C. Fajgenbaum: Type I IFN response associated with mTOR activation in the TAFRO subtype of idiopathic multicentric Castleman disease JCI Insight. 5 (9): e135031,2020..
Frits van Rhee, Eric Oksenhendler, Gordan Srkalovic, Peter Voorhees, Megan Lim, Makoto Ide, Sophia Parente, Stephen Schey, Matthew Streetly, Raymond Wong, David Wu, Ivan Maillard, Joshua Brandstadter, Nikhil Munshi, Angela Dispenzieri, Kojo S. Elenitoba-Johnson, Alexander Fössa, Mary Jo Lechowicz, Shanmuganathan Chandrakasan, Sheila K. Pierson, Amy Greenway, Sunita Nasta, Kazuyuki Yoshizaki, Razelle Kurzrock, Thomas S. Uldrick, Corey Casper, David C. Fajgenbaum: International, evidence-based consensus diagnostic and treatment guidelines for unicentric Castleman Disease Blood Advances. 4 (23): 6039-6050,2020..
Angela Dispenzieri & David C. Fajgenbaum: Overview of Castleman Disease Blood. 135 (16): 1353–1364,2020.
David C. Fajgenbaum: Chasing My Cure: A Doctor's Race to Turn Hope Into Action Ballantine (an imprint of Penguin Random House). : 2019..
David C. Fajgenbaum, Ruth-Anne Langan, Alberto Sada Japp, Helen L. Partridge, Sheila K. Pierson, Amrit Singh, Daniel J. Arenas, Jason R. Ruth, Christopher S. Nabel, Katie Stone, Mariko Okumura, Anthony Schwarer, Fabio Freire Jose, Nelson Hamerschlak, Gerald B. Wertheim, Michael B. Jordan, Adam D. Cohen, Vera Krymskaya, Arthur Rubenstein, Michael R. Betts, Taku Kambayashi, Frits van Rhee, Thomas S. Uldrick: Identifying and targeting pathogenic PI3K/AKT/mTOR signaling in IL-6-blockade-refractory idiopathic multicentric Castleman disease Journal of Clinical Investigation. 129 (10): 4451-4463,2019..
David C. Fajgenbaum: HHV-8-negative/idiopathic multicentric Castleman disease UpToDate. : 2018-Present..
Frits van Rhee, Peter Voorhees, Angela Dispenzieri, Alexander Fossa, Gordan Srkalovic, Makoto Ide, Nikhil Munshi, Stephen Schey, Matthew Streetly, Sheila K. Pierson, Helen L. Partridge, Sudipto Mukherjee, Dustin Shilling, Katie Stone, Amy Greenway, Jason Ruth, Mary Jo Lechowicz, Shanmuganathan Chandrakasan, Raj Jayanthan, Elaine S. Jaffe, Heather Leitch, Naveen Pemmaraju, Amy Chadburn, Megan S. Lim, Kojo S. Elenitoba-Johnson, Vera Krymskaya, Aaron Goodman, Christian Hoffmann, Pier Luigi Zinzani, Simone Ferrero, Louis Terriou, Yasuharu Sato, David Simpson, Raymond Wong, Jean-Francois Rossi, Sunita Nasta, Kazuyuki Yoshizaki, Razelle Kurzrock, Thomas S. Uldrick, Corey Casper, Eric Oksenhendler, David C. Fajgenbaum: International, evidence-based consensus treatment guidelines for idiopathic multicentric Castleman disease Blood. 132 (20): 2115-2124,2018..
David C. Fajgenbaum, Thomas S. Uldrick, Adam Bagg, Dale Frank, David Wu, Gordan Srkalovic, David Simpson, Amy Y. Liu, David Menke, Shanmuganathan Chandrakasan, Mary Jo Lechowicz, Raymond S.M. Wong, Sheila Pierson, Michele Paessler, Jean-Francois Rossi, Makoto Ide, Jason Ruth, Michael Croglio, Alexander Suarez, Vera Krymskaya, Amy Chadburn, Gisele Colleoni, Sunita Nasta, Raj Jayanthan, Christopher S. Nabel, Corey Casper, Angela Dispenzieri, Alexander Fossa, Dermot Kelleher, Razelle Kurzrock, Peter Voorhees, Ahmet Dogan, Kazuyuki Yoshizaki, Frits van Rhee, Eric Oksenhendler, Elaine S. Jaffe, Kojo S.J. Elenitoba-Johnson, Megan S. Lim: International, evidence-based consensus diagnostic criteria for HHV-8-negative/idiopathic multicentric Castleman disease Blood. 129 (12): 1646-1657,2017..
David C. FajgenbaumUniversity of Pennsylvania, Perelman School of MedicineDivision of Translational Medicine & Human GeneticsCenter for Cytokine Storm Treatment & Laboratory (CSTL)3535 Market Street Suite 700, Room 717