Timothy Quan, MD
Research & Publications
Biography
Research Summary
We seek to understand the role of viruses in inducing autoimmune pathology. A main focus of our efforts is the role of Epstein Barr virus in SLE. Increased seroprevalence of EBV has been demonstrated in lupus patients compared to controls and we have demonstrated elevated EBV viral loads in the periphery of patients with SLE. An important goal for us is to understand the cause and effects of elevated viral loads in relationship to lupus. Our laboratory investigates this relationship using immunologic, molecular and cellular techniques. We have demonstrated that EBV can induce IFN-alpha production from plasmacytoid dendritic cells through an MHC class II mechanism. IFN–alpha has been shown to be a key player in inducing autoimmune disease. Our studies support an important role for EBV in perpetuating or initiating autoimmune disease.
In a separate line of investigation, we study the biology of fibrocytes, a blood-borne cell with inflammatory and fibrogenic properties. We are characterizing these cells in both human and animal models. We are exploring the role of these cells in normal and pathologic fibrosis.
In a separate line of investigation, we study the biology of fibrocytes, a blood-borne cell with inflammatory and fibrogenic properties. We are characterizing these cells in both human and animal models. We are exploring the role of these cells in normal and pathologic fibrosis.
Extensive Research Description
Dr. Quan’s project, The Role of Dendritic Cells in Interstitial Lung Disease Associated with Rheumatoid Arthritis, tests a new model which examines fibrosis in the context of well known inflammatory cells, myeloid dendritic cells (mDC), that may link inflammation to fibrosis. Myeloid dendritic cells promote fibrosis by producing collagen and are thus key players in interstitial lung disease associated with rheumatoid arthritis.
Coauthors
Selected Publications
- Culture and Analysis of Circulating FibrocytesQuan TE, Bucala R. Culture and Analysis of Circulating Fibrocytes. 2007, 135: 423-434. PMID: 17951676, DOI: 10.1007/978-1-59745-401-8_28.
- The role of circulating fibrocytes in fibrosisQuan TE, Cowper SE, Bucala R. The role of circulating fibrocytes in fibrosis. Current Rheumatology Reports 2006, 8: 145-150. PMID: 16569374, DOI: 10.1007/s11926-006-0055-x.
- Utility of age, gender, ANA titer and pattern as predictors of anti-ENA and -dsDNA antibodiesKang I, Siperstein R, Quan T, Breitenstein ML. Utility of age, gender, ANA titer and pattern as predictors of anti-ENA and -dsDNA antibodies. Clinical Rheumatology 2004, 23: 509-515. PMID: 15801070, DOI: 10.1007/s10067-004-0937-0.
- Circulating fibrocytes: collagen-secreting cells of the peripheral bloodQuan TE, Cowper S, Wu SP, Bockenstedt LK, Bucala R. Circulating fibrocytes: collagen-secreting cells of the peripheral blood. The International Journal Of Biochemistry & Cell Biology 2004, 36: 598-606. PMID: 15010326, DOI: 10.1016/j.biocel.2003.10.005.
- Defective Control of Latent Epstein-Barr Virus Infection in Systemic Lupus ErythematosusKang I, Quan T, Nolasco H, Park SH, Hong MS, Crouch J, Pamer EG, Howe JG, Craft J. Defective Control of Latent Epstein-Barr Virus Infection in Systemic Lupus Erythematosus. The Journal Of Immunology 2004, 172: 1287-1294. PMID: 14707107, DOI: 10.4049/jimmunol.172.2.1287.