Timothy E. Quan MD

Assistant Clinical Professor of Medicine (Rheumatology)

Research Interests

viruses; autoimmune pathology; biology of fibrocytes

Current Projects

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.

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.


Selected Publications

  • Quan, T., Bucala, R. Culture and analysis of circulating fibrocytes. Arthritis Research Methods and Protocols, Vol 1 (ed. Cope), Humana Press, Totowa, NJ, 135:423-433, 2007.
  • Quan, T., Cowper, S., Bucala, R., The role of circulating fibrocytes in fibrosis. Current Reports in Rheumatology, 8(2):145-50, 2006.
  • Kang, I., Siperstein, R., Quan, T., Breitenstein, ML. Utility of age, gender, and ANA titer and pattern as predictors of anti-ENA and -dsDNA antibodies. Clinical Rheumatology, 23:509-515, 2004.
  • Quan, T., Cowper, S., Wu, S., Bockenstedt, L., Bucala, R. Circulating fibrocytes: collagen-secreting cells of the peripheral blood. The International Journal of Biochemistry and Cell Biology 36:598-606, 2004.
  • Kang*, I., Quan*, T., Nolasco, H., Park, S.H., Hong, S.H., Crouch, J., Howe, J.G., Craft, J. Defective control of latent EBV infection in systemic lupus erythematosus. The Journal of Immunology, 172:1287-1294, 2004. (* joint first authors)

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