CONTEXT: The molecular basis for anatomically dispersed clinical manifestations in Graves' disease (GD) eludes our understanding. Bone marrow-derived, pluripotent fibrocytes represent a subset of peripheral blood mononuclear cells and infiltrate the orbital and thyroid tissues in GD. These cells may be involved in the pathogenesis of thyroid-associated ophthalmopathy (TAO). OBJECTIVE: The objective of the study was to quantify fibrocyte display of functional cell surface TSH receptor (TSHR), identify the profile of chemokines they express after TSHR activation, and determine whether circulating TSHR(+) peripheral blood fibrocytes are more frequent in situ in patients with TAO. DESIGN/SETTING/PARTICIPANTS: Using a newly developed technique, fibrocytes were directly identified in peripheral blood from 31 patients with TAO and 19 healthy subjects receiving care at a multidisciplinary academic center. MAIN OUTCOME MEASURES: The frequency in situ of fibrocytes (collagen 1(+), CD45(+), CD34(+), CD14(+), CD86(+) peripheral blood mononuclear cells) was assessed by multiparameter flow cytometry and correlated to clinical disease activity and smoking status. Levels of TSHR-displaying fibrocytes and their response to TSH and TSHR-activating antibody, M22, were measured by flow cytometry, Luminex, and real-time PCR. RESULTS: The levels of TSHR expression by fibrocytes are substantially higher than those found in orbital fibroblasts. Moreover, the frequency of TSHR(+) fibrocytes in patients with TAO was greater than that in healthy subjects in situ. Their abundance is not influenced by disease activity or smoking history. These cells produce high levels of several cytokines and chemokines including IL-8, regulated upon activation, normal T cell expressed and secreted, and monocyte chemoattractant protein-1 when treated with TSH or M22. TSH induces IL-8 production at the pretranslational level. This induced cytokine can be detected in intact fibrocytes ex vivo. CONCLUSIONS: Frequency of circulating TSHR(+) fibrocytes is markedly increased in patients with TAO, and they express proinflammatory chemokines in response to TSH. Because they infiltrate both orbit and thyroid in GD, they may represent the link between systemic immunoreactivity and organ-specific autoimmunity.
CONTEXT: The molecular basis for anatomically dispersed clinical manifestations in Graves' disease (GD) eludes our understanding. Bone marrow-derived, pluripotent fibrocytes represent a subset of peripheral blood mononuclear cells and infiltrate the orbital and thyroid tissues in GD. These cells may be involved in the pathogenesis of thyroid-associated ophthalmopathy (TAO). OBJECTIVE: The objective of the study was to quantify fibrocyte display of functional cell surface TSH receptor (TSHR), identify the profile of chemokines they express after TSHR activation, and determine whether circulating TSHR(+) peripheral blood fibrocytes are more frequent in situ in patients with TAO. DESIGN/SETTING/PARTICIPANTS: Using a newly developed technique, fibrocytes were directly identified in peripheral blood from 31 patients with TAO and 19 healthy subjects receiving care at a multidisciplinary academic center. MAIN OUTCOME MEASURES: The frequency in situ of fibrocytes (collagen 1(+), CD45(+), CD34(+), CD14(+), CD86(+) peripheral blood mononuclear cells) was assessed by multiparameter flow cytometry and correlated to clinical disease activity and smoking status. Levels of TSHR-displaying fibrocytes and their response to TSH and TSHR-activating antibody, M22, were measured by flow cytometry, Luminex, and real-time PCR. RESULTS: The levels of TSHR expression by fibrocytes are substantially higher than those found in orbital fibroblasts. Moreover, the frequency of TSHR(+) fibrocytes in patients with TAO was greater than that in healthy subjects in situ. Their abundance is not influenced by disease activity or smoking history. These cells produce high levels of several cytokines and chemokines including IL-8, regulated upon activation, normal T cell expressed and secreted, and monocyte chemoattractant protein-1 when treated with TSH or M22. TSH induces IL-8 production at the pretranslational level. This induced cytokine can be detected in intact fibrocytes ex vivo. CONCLUSIONS: Frequency of circulating TSHR(+) fibrocytes is markedly increased in patients with TAO, and they express proinflammatory chemokines in response to TSH. Because they infiltrate both orbit and thyroid in GD, they may represent the link between systemic immunoreactivity and organ-specific autoimmunity.
Authors: Terry J Smith; Laura Koumas; AnneMarie Gagnon; Andrea Bell; Gregory D Sempowski; Richard P Phipps; Alexander Sorisky Journal: J Clin Endocrinol Metab Date: 2002-01 Impact factor: 5.958
Authors: Andrea Alter; Martin Duddy; Sherry Hebert; Katarzyna Biernacki; Alexandre Prat; Jack P Antel; Voon Wee Yong; Robert K Nuttall; Caroline J Pennington; Dylan R Edwards; Amit Bar-Or Journal: J Immunol Date: 2003-05-01 Impact factor: 5.422
Authors: Liju Yang; Paul G Scott; Jennifer Giuffre; Heather A Shankowsky; Aziz Ghahary; Edward E Tredget Journal: Lab Invest Date: 2002-09 Impact factor: 5.662
Authors: Erin F Gillespie; Nupur Raychaudhuri; Konstantinos I Papageorgiou; Stephen J Atkins; Ying Lu; Laya K Charara; Tünde Mester; Terry J Smith; Raymond S Douglas Journal: Invest Ophthalmol Vis Sci Date: 2012-11-21 Impact factor: 4.799
Authors: Hendrik W van Deventer; Daniela A Palmieri; Qing Ping Wu; Everett C McCook; Jonathan S Serody Journal: J Immunol Date: 2013-03-27 Impact factor: 5.422
Authors: Brian J Lee; Stephen Atkins; Anna Ginter; Victor M Elner; Christine C Nelson; Raymond S Douglas Journal: Ophthalmic Plast Reconstr Surg Date: 2015 May-Jun Impact factor: 1.746