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Affiliation(s)
- Marian Ludgate
- Thyroid Research Group, Division of Infection & Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, UK.
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52
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TSH/IGF1 receptor crosstalk: Mechanism and clinical implications. Pharmacol Ther 2020; 209:107502. [PMID: 32061922 DOI: 10.1016/j.pharmthera.2020.107502] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 02/05/2020] [Indexed: 02/07/2023]
Abstract
Increasing evidence of interdependence between G protein-coupled receptors and receptor tyrosine kinase signaling pathways has prompted reevaluation of crosstalk between these receptors in disease and therapy. Investigations into thyroid-stimulating hormone (TSH) and insulin-like growth factor 1 (IGF1) receptor crosstalk, and its application to the clinic have in particular shown recent progress. In this review, we summarize current insights into the mechanism of TSH/IGF1 receptor crosstalk. We discuss evidence that crosstalk is one of the underlying causes of TSHR-based disease and the feasibility of using combinations of TSH receptor and IGF1 receptor antagonists to increase the therapeutic index for the treatment of Graves' hyperthyroidism and Graves' ophthalmopathy.
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Taylor PN, Zhang L, Lee RWJ, Muller I, Ezra DG, Dayan CM, Kahaly GJ, Ludgate M. New insights into the pathogenesis and nonsurgical management of Graves orbitopathy. Nat Rev Endocrinol 2020; 16:104-116. [PMID: 31889140 DOI: 10.1038/s41574-019-0305-4] [Citation(s) in RCA: 138] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/26/2019] [Indexed: 12/13/2022]
Abstract
Graves orbitopathy, also known as thyroid eye disease or thyroid-associated orbitopathy, is visually disabling, cosmetically disfiguring and has a substantial negative impact on a patient's quality of life. There is increasing awareness of the need for early diagnosis and rapid specialist input from endocrinologists and ophthalmologists. Glucocorticoids are the mainstay of treatment; however, recurrence occurs frequently once these are withdrawn. Furthermore, in >60% of cases, normal orbital anatomy is not restored, and skilled rehabilitative surgery is required. Clinical trials have shown that considerable benefit can be derived from the addition of antiproliferative agents (such as mycophenolate or azathioprine) in preventing deterioration after steroid cessation. In addition, targeted biologic therapies have shown promise, including teprotumumab, which reduces proptosis, rituximab (anti-CD20), which reduces inflammation, and tocilizumab, which potentially benefits both of these parameters. Other strategies such as orbital radiotherapy have had their widespread role in combination therapy called into question. The pathophysiology of Graves orbitopathy has also been revised with identification of new potential therapeutic targets. In this Review we provide an up-to-date overview of the field, outline the optimal management of Graves orbitopathy and summarize the research developments in this area to highlight future research questions and direct future clinical trials.
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Affiliation(s)
- Peter N Taylor
- Thyroid Research Group, Systems Immunity Research Institute, Cardiff University School of Medicine, Cardiff, UK.
| | - Lei Zhang
- Thyroid Research Group, Systems Immunity Research Institute, Cardiff University School of Medicine, Cardiff, UK
| | - Richard W J Lee
- Moorfields Eye Hospital NHS Foundation Trust, London, UK
- University of Bristol, Bristol, UK
| | - Ilaria Muller
- Thyroid Research Group, Systems Immunity Research Institute, Cardiff University School of Medicine, Cardiff, UK
- Fondazione IRRCS Ca' Granda Ospedale Maggiore Policinico, Department of Endocrinology, Milan, Italy
| | - Daniel G Ezra
- Moorfields Eye Hospital NHS Foundation Trust, London, UK
| | - Colin M Dayan
- Thyroid Research Group, Systems Immunity Research Institute, Cardiff University School of Medicine, Cardiff, UK
| | - George J Kahaly
- Department of Medicine I, Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Marian Ludgate
- Thyroid Research Group, Systems Immunity Research Institute, Cardiff University School of Medicine, Cardiff, UK
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Schwiebert C, Kühnen P, Becker NP, Welsink T, Keller T, Minich WB, Wiegand S, Schomburg L. Antagonistic Autoantibodies to Insulin-Like Growth Factor-1 Receptor Associate with Poor Physical Strength. Int J Mol Sci 2020; 21:ijms21020463. [PMID: 31940750 PMCID: PMC7013472 DOI: 10.3390/ijms21020463] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 01/04/2023] Open
Abstract
Natural autoantibodies to the IGF1 receptor (IGF1R-aAb) have been described in relation to Graves' ophthalmopathy. Other physiological roles of natural IGF1R-aAb are not known. We hypothesized that IGF1R-aAb may be related to muscle development. Serum samples (n = 408) from young overweight subjects (n = 143) were collected during a lifestyle intervention study. Anthropometric parameters, along with leptin, IGF1 and IGF1R-aAb concentrations, were analyzed, and the subjects were categorized into positive or negative for IGF1R-aAb. Eleven out of 143 subjects (7.7%) were positive for IGF1R-aAb. Identified IGF1R-aAb were molecularly characterized and showed antagonistic activity in vitro impairing IGF1-mediated IGF1R activation. Mean body weight, height or age were similar between IGF1R-aAb-positive and -negative subjects, but IGF1 concentrations differed. Jumping ability, as well as right and left handgrip strengths, were lower in the IGF1R-aAb-positive as compared to the IGF1R-aAb-negative subjects. We conclude that natural IGF1R-aAb are detectable in apparently healthy subjects and are capable of antagonizing IGF1-dependent IGF1R activation. Moreover, the presence of IGF1R-aAb is associated with poor physical strength. Although the causality of this association is unclear, the data imply a potential influence of IGF1R autoimmunity on muscle development.
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Affiliation(s)
- Christian Schwiebert
- Institute for Experimental Endocrinology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (C.S.); (N.-P.B.); (T.W.); (W.B.M.)
| | - Peter Kühnen
- Department of Paediatric Endocrinology and Diabetology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (P.K.); (S.W.)
| | - Niels-Peter Becker
- Institute for Experimental Endocrinology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (C.S.); (N.-P.B.); (T.W.); (W.B.M.)
| | - Tim Welsink
- Institute for Experimental Endocrinology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (C.S.); (N.-P.B.); (T.W.); (W.B.M.)
| | - Theresa Keller
- Institute of Biometry and Clinical Epidemiology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Charitéplatz 1, D-10117 Berlin, Germany;
| | - Waldemar B. Minich
- Institute for Experimental Endocrinology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (C.S.); (N.-P.B.); (T.W.); (W.B.M.)
| | - Susanna Wiegand
- Department of Paediatric Endocrinology and Diabetology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (P.K.); (S.W.)
| | - Lutz Schomburg
- Institute for Experimental Endocrinology, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Augustenburger Platz 1, D-13353 Berlin, Germany; (C.S.); (N.-P.B.); (T.W.); (W.B.M.)
- Correspondence: ; Tel.: +49-30-450-524289
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Längericht J, Krämer I, Kahaly GJ. Glucocorticoids in Graves' orbitopathy: mechanisms of action and clinical application. Ther Adv Endocrinol Metab 2020; 11:2042018820958335. [PMID: 33403097 PMCID: PMC7745544 DOI: 10.1177/2042018820958335] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/20/2020] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Graves' orbitopathy (GO) is the most frequent extrathyroidal manifestation of the autoimmune Graves' disease. GO significantly impacts quality of life and has a psycho-social morbidity. Inflammation and swelling of the orbital tissue often leads to proptosis, diplopia, and decrease of visual acuity. Due to the inflammatory background of the disease, glucocorticoids (GC) have been used as a first-line treatment for decades. METHODS PubMed and MeSH database were searched for original articles, clinical trials, reviews, and meta-analyses published between 1 January 2000 and 31 March 2020 and pertaining to both the mechanism of action and immunological effects of GC as well as to the treatment of GO by GC. The publications were evaluated according to their setting and study design. RESULTS GC act through genomic (trans-activation and trans-repression) and rapid non-genomic mechanisms. GC in general, and the intravenous (IV) administration of GC in particular, markedly decrease the activity and number of the most potent antigen-presenting dendritic cells. According to the internationally acknowledged European Thyroid Association Guidelines for the management of GO, weekly IVGC application over 12 weeks is recommended as first-line treatment for patients with active and severe GO. The daily and cumulative dose should be tailored according to clinical severity, for example, 4.5 g of IV methylprednisolone for the inflammatory component versus 7.5 g in the presence of diplopia and severe proptosis. Fast and significant improvements in orbital symptoms and signs are noted in 65-70% of patients. Long-term experience over decades, and worldwide availability at low cost, underline the clinical and therapeutic relevance of GC. Adverse events are rarely severe, dose-dependent, and usually reversible, hence easy to handle by medical investigators. Oral GC application on a daily basis is characterized by high bioavailability but reduced efficacy and increased toxicity. CONCLUSION IVGC still represents the standard of care in active/severe GO. Innovative biologicals, like monoclonal antibodies targeting the thyrotropin/Insulin-like growth factor-1 receptors or pro-inflammatory cytokines (e.g., Interleukin-6) should be compared with standard GC treatment with respect to short- and long-term efficacy, safety, costs, and global availability.
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Affiliation(s)
- Jan Längericht
- Department of Medicine I., Johannes Gutenberg University (JGU) Medical Center, Mainz, Rheinland-Pfalz, Germany
| | - Irene Krämer
- Department of Pharmacy, Johannes Gutenberg University (JGU) Medical Center, Mainz, Rheinland-Pfalz, Germany
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Boutin A, Gershengorn MC, Neumann S. β-Arrestin 1 in Thyrotropin Receptor Signaling in Bone: Studies in Osteoblast-Like Cells. Front Endocrinol (Lausanne) 2020; 11:312. [PMID: 32508750 PMCID: PMC7251030 DOI: 10.3389/fendo.2020.00312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 04/24/2020] [Indexed: 12/20/2022] Open
Abstract
A direct action of thyrotropin (TSH, thyroid-stimulating hormone) on bone precursors in humans is controversial. Studies in rodent models have provided conflicting findings. We used cells derived from a moderately differentiated osteosarcoma stably overexpressing human TSH receptors (TSHRs) as a model of osteoblast precursors (U2OS-TSHR cells) to investigate TSHR-mediated effects in bone differentiation in human cells. We review our findings that (1) TSHR couples to several different G proteins to induce upregulation of genes associated with osteoblast activity-interleukin 11 (IL-11), osteopontin (OPN), and alkaline phosphatase (ALPL) and that the kinetics of the induction and the G protein-mediated signaling pathways involved were different for these genes; (2) TSH can stimulate β-arrestin-mediated signal transduction and that β-arrestin 1 in part mediates TSH-induced pre-osteoblast differentiation; and (3) TSHR/insulin-like growth factor 1 (IGF1) receptor (IGF1R) synergistically increased OPN secretion by TSH and IGF1 and that this crosstalk was mediated by physical association of these receptors in a signaling complex that uses β-arrestin 1 as a scaffold. These findings were complemented using a novel β-arrestin 1-biased agonist of TSHR. We conclude that TSHR can signal via several transduction pathways leading to differentiation of this model system of human pre-osteoblast cells and, therefore, that TSH can directly regulate these bone cells.
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57
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Paik JS, Kim SE, Kim JH, Lee JY, Yang SW, Lee SB. Insulin-like growth factor-1 enhances the expression of functional TSH receptor in orbital fibroblasts from thyroid-associated ophthalmopathy. Immunobiology 2019; 225:151902. [PMID: 31899052 DOI: 10.1016/j.imbio.2019.151902] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 12/12/2019] [Accepted: 12/24/2019] [Indexed: 01/09/2023]
Abstract
Thyroid-associated ophthalmopathy (TAO), an autoimmune disease, occurs in approximately 50 % of patients with Graves' hyperthyroidism. Thyroid-stimulating hormone receptor (TSHR) that is expressed in orbital fibroblasts is the autoimmune target in the development of TAO. In addition to thyroid-stimulating immunoglobulin (TSI), insulin-like growth factor (IGF)-1 is also involved in the development of TAO. IGF-1 has been reported to potentiate the effects of thyroid-stimulating hormone (TSH) and TSI on TSHR signaling. In the current study, we investigated the effects of IGF-1 on the cell surface expression of the functional TSHR and its possible mechanism of action in human orbital fibroblasts. Our results show that orbital fibroblasts from the TAO patients expressed higher levels of IGF-1 receptor (IGF-R), compared to control subjects. Treatment with IGF-1 enhanced the expression of surface TSHR in orbital fibroblasts from TAO patients, but not from control subjects. In addition, treatment with IGF-1 increased the level of TSHR at both the protein and mRNA levels. Furthermore, pre-treatment with IGF-1 potentiated TSH-induced cAMP production, compared to cells that were treated with only TSH. Our results also show that pre-treatment with cycloheximide, an inhibitor of mRNA translation, partially, but not completely, inhibited the expression of TSHR on the cell surfaces of orbital fibroblasts from TAO patients. These collective results show that IGF-1enhances the cell surface expression of functional TSHR, not only by increasing TSHR expression, but also by inducing TSHR translocation to the plasma membrane in orbital fibroblasts from TAO.
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Affiliation(s)
- Ji Sun Paik
- Department of Ophthalmology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sung-Eun Kim
- Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ji Hyun Kim
- Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ji-Young Lee
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Suk-Woo Yang
- Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seong-Beom Lee
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
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58
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Yang IH, Rose GE, Ezra DG, Bailly M. Macrophages promote a profibrotic phenotype in orbital fibroblasts through increased hyaluronic acid production and cell contractility. Sci Rep 2019; 9:9622. [PMID: 31270379 PMCID: PMC6610127 DOI: 10.1038/s41598-019-46075-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 06/21/2019] [Indexed: 12/29/2022] Open
Abstract
Graves’ orbitopathy (GO) is an autoimmune inflammatory disease affecting the orbit. Orbital fibroblasts are a key component in GO pathogenesis, which includes inflammation, adipogenesis, hyaluronic acid (HA) secretion, and fibrosis. Macrophages are thought to participate in the immunological stage of GO, but whether they can directly affect the fibroblasts phenotype and modulate disease progression is unknown. We previously showed that GO adipogenic and fibrotic phenotypes could be modelled in a pseudo-physiological 3D environment in vitro. Here, we introduced macrophages in this 3D culture model to investigate role for macrophages in modulating adipogenesis, HA production, and contractility in orbital fibroblasts. Macrophages had a minimal effect on lipid droplet formation in fibroblasts, but significantly increased HA production and cell contractility, suggesting that they may promote the fibrotic phenotype. This effect was found to be mediated at least in part through phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) activation and linked to an increase in actin polymerization and protrusive activity in fibroblasts. Overall our work shows for the first time a direct role for macrophages in modulating the fibroblasts’ phenotype in GO, supporting a role for macrophages in the progression of the fibrotic phenotype through induction of HA production and stimulation of the contractile phenotype in orbital fibroblasts.
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Affiliation(s)
- I-Hui Yang
- UCL Institute of Ophthalmology, London, EC1V 9EL, UK.,Department of Ophthalmology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Geoffrey E Rose
- Department of Adnexal Surgery, Moorfields Eye Hospital, London, EC1V 2PD, UK
| | - Daniel G Ezra
- UCL Institute of Ophthalmology, London, EC1V 9EL, UK.,Department of Adnexal Surgery, Moorfields Eye Hospital, London, EC1V 2PD, UK.,NIHR Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital, City Road, London, EC1V 2PD, UK
| | - Maryse Bailly
- UCL Institute of Ophthalmology, London, EC1V 9EL, UK.
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Oeverhaus M, Copei A, Mattheis S, Ringelstein A, Tiemessen M, Esser J, Eckstein A, Stähr K. Influence of orbital morphology on proptosis reduction and ocular motility after decompression surgery in patients with Graves' orbitopathy. PLoS One 2019; 14:e0218701. [PMID: 31233522 PMCID: PMC6590818 DOI: 10.1371/journal.pone.0218701] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/08/2019] [Indexed: 12/26/2022] Open
Abstract
PURPOSE Orbital decompression surgery is performed in patients with Graves' orbitopathy to treat dysthyroid optical neuropathy (DON) and reduce disfiguring proptosis. The intended proptosis reduction can deviate from the postoperative result and changes of motility with consecutive diplopia can occur. We performed a retrospective study to identify anatomical factors in computed tomography (CT), which influence the surgical effect and postoperative ocular motility and diplopia. METHODS Pre- and postoperative CT-scans of 125 eyes of 68 patients, who mainly underwent a balanced orbital decompression for disfiguring proptosis (≥18mm Hertel Index), have been analyzed. Proptosis, ductions, misalignment and diplopia were assessed before and after surgery. Medial and lateral orbital wall length, conus angle, depth of ethmoidal sinus, orbital surface, length of medial and orbital defect, depth of tissue prolapse and horizontal muscle diameters were analyzed in CT scans before and after surgery. With linear regression and multivariate analyses these parameters have been correlated with postoperative proptosis, abduction deficit, deviation and binocular single vision (BSV). RESULTS Proptosis could be reduced by 5.3±2mm. Patients with <5mm proptosis reduction had significantly less often new onset of diplopia compared to patients with >5mm reduction (13% vs. 56%, p = 0.02). Multiple linear regression showed a significant correlation between tissue prolapse and depth of the ethmoidal sinus as well as age (p<0.001, r = 0.71). Proptosis reduction could not be predicted by tissue prolapse, defect length or depth of ethmoidal sinus. The abduction deficit correlated significantly with tissue prolapse and orbital surface area (p<0.001, r = 0.37) but not with the horizontal muscle diameter. CONCLUSION We were able to show that orbital morphology influences the outcome of balanced orbital decompression surgery in terms of proptosis reduction and motility. However, the rather low coefficients of correlation show that the surgical outcome cannot be predicted with simple CT measurements, although risk factors for postoperative abduction deficit could be found. Therefore, preoperative planning should consider especially the orbital surface area and depth of ethmoidal sinus. Patients should be informed about the higher risk of diplopia with higher proptosis reduction.
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Affiliation(s)
- Michael Oeverhaus
- Department of Ophthalmology, University Hospital Essen, Essen, Germany
| | - Anna Copei
- Department of Ophthalmology, University Hospital Essen, Essen, Germany
- Department of Gynecology, University Hospital Oldenburg, Oldenburg, Germany
| | - Stefan Mattheis
- Department of Oto-Rhino-Laryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
| | | | - Madeleine Tiemessen
- Department of Radiology and Neuroradiology, Alfried Krupp Hospital Essen, Essen, Germany
| | - Joachim Esser
- Department of Ophthalmology, University Hospital Essen, Essen, Germany
| | - Anja Eckstein
- Department of Ophthalmology, University Hospital Essen, Essen, Germany
| | - Kerstin Stähr
- Department of Gynecology, University Hospital Oldenburg, Oldenburg, Germany
- * E-mail:
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Krieger CC, Boutin A, Jang D, Morgan SJ, Banga JP, Kahaly GJ, Klubo-Gwiezdzinska J, Neumann S, Gershengorn MC. Arrestin-β-1 Physically Scaffolds TSH and IGF1 Receptors to Enable Crosstalk. Endocrinology 2019; 160:1468-1479. [PMID: 31127272 PMCID: PMC6542485 DOI: 10.1210/en.2019-00055] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 04/20/2019] [Indexed: 01/14/2023]
Abstract
Endogenously expressed TSH receptors (TSHRs) on orbital fibroblasts of patients with Graves ophthalmopathy (GO) use crosstalk with IGF1 receptors (IGF1R) to synergistically stimulate secretion of hyaluronan (HA), a major component of GO pathology. We previously showed crosstalk occurred upstream of mitogen-activated protein kinase (ERK) phosphorylation. Because other G protein-coupled receptors engage arrestin-β-1 (ARRB1) and ERK, we tested whether ARRB1 was a necessary component of TSHR/IGF1R crosstalk. HA secretion was stimulated by the TSHR-stimulating monoclonal antibodies M22 and KSAb1, or immunoglobulins from patients with GO (GO-Igs). Treatment with M22, as previously shown, resulted in biphasic dose-response stimulation of HA secretion. The high-potency phase was IGF1R dependent, and the low-potency phase was partly IGF1R independent. KSAb1 produced a monophasic dose-response stimulation of HA secretion, whose potency was lowered >20-fold after IGF1R knockdown. ARRB1 knockdown abolished M22's high-potency phase and lowered KSAb1's potency and efficacy. ARRB1 knockdown inhibited GO-Ig stimulation of HA secretion and of ERK phosphorylation. Last, ARRB1 was shown to be necessary for TSHR/IGF1R proximity. In contrast, ARRB2 knockdowns did not show these effects. Thus, TSHR must neighbor IGF1R for crosstalk in GO fibroblasts to occur, and this depends on ARRB1 acting as a scaffold. Similar scaffolding of TSHR and IGF1R by ARRB1 was found in human osteoblast-like cells and human thyrocytes. These findings support a model of TSHR/IGF1R crosstalk that may be a general mechanism for G-protein-coupled receptor/receptor tyrosine kinase crosstalk dependent on ARRB1.
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Affiliation(s)
- Christine C Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Alisa Boutin
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Daesong Jang
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Sarah J Morgan
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - J Paul Banga
- Faculty of Life Sciences & Medicine, King’s College London, The Rayne Institute, London, United Kingdom
| | - George J Kahaly
- Molecular Thyroid Research Laboratory, Department of Medicine I, Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Joanna Klubo-Gwiezdzinska
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Marvin C Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
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Marinò M, Rotondo Dottore G, Ionni I, Lanzolla G, Sabini E, Ricci D, Sframeli A, Mazzi B, Menconi F, Latrofa F, Vitti P, Marcocci C, Chiovato L. Serum antibodies against the insulin-like growth factor-1 receptor (IGF-1R) in Graves' disease and Graves' orbitopathy. J Endocrinol Invest 2019; 42:471-480. [PMID: 30132285 DOI: 10.1007/s40618-018-0943-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 08/09/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND A role of the insulin-like growth factor-1 receptor (IGF-1R) in the pathogenesis of Graves' orbitopathy (GO) has been proposed, but the existence and function of anti-IGF-1R-antibodies (IGF-1R-Abs) are debated. METHODS We designed a cross-sectional investigation to measure serum IGF-1R-Abs by a commercial assay in consecutive patients with Graves' disease (GD) compared with healthy subjects and patients with autoimmune thyroiditis (AT). A total of 134 subjects were screened including 27 healthy subjects, 80 GD patients (54 of whom with GO), and 27 AT patients. The main outcome measure was the prevalence of positive serum IGF-1R-Abs in GO, compared with GD without GO and with the other study groups. RESULTS Having established a cut-off value at 55.2 ng/ml for positive tests, positive IGF-1R-Abs were more frequent in GD (25%), than in AT (3.7%, P = 0.003) and healthy subjects (0%, P = 0.006). Within GD, there was no difference between patients with or without GO. Serum levels of IGF-1R-Abs differed across the study population (P < 0.0001), reflecting their higher concentrations in GD (P < 0.0001 vs both AT and healthy subjects), but with no difference between patients with or without GO. In patients with GO, there was an inverse correlation between serum IGF-1R-Abs and CAS (R = - 0.376, 95% CI: from - 0.373 to - 0.631; P = 0.005), the significance of which remains to be investigated. CONCLUSIONS Serum autoantibodies against the IFG-1R are present in one-fourth of GD patients, regardless of the presence of GO. Further functional studies are needed to investigate the significance of their inverse correlation with GO activity.
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Affiliation(s)
- M Marinò
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy.
| | - G Rotondo Dottore
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - I Ionni
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - G Lanzolla
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - E Sabini
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
- Division of Immunology, Department of Pathology, The Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - D Ricci
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - A Sframeli
- Ophthalmology Unit I, Department of Surgical, Medical and Molecular Pathology, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - B Mazzi
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - F Menconi
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - F Latrofa
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - P Vitti
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - C Marcocci
- Endocrinology Unit I, Department of Clinical and Experimental Medicine, University Hospital of Pisa, University of Pisa, Via Paradisa 2, 56124, Pisa, Italy
| | - L Chiovato
- Unit of Endocrinology, Department of Internal Medicine and Medical Therapy, University of Pavia, Fondazione Salvatore Maugeri IRCCS, Pavia, Italy
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Schrijver B, Kooiman MA, Kasteleijn E, van Holten-Neelen C, Virakul S, Paridaens D, Peeters RP, van Hagen PM, Dalm VASH, Dik WA. Basic Fibroblast Growth Factor Induces Adipogenesis in Orbital Fibroblasts: Implications for the Pathogenesis of Graves' Orbitopathy. Thyroid 2019; 29:395-404. [PMID: 30724135 DOI: 10.1089/thy.2018.0544] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
BACKGROUND Basic fibroblast growth factor (bFGF) has been implicated in the pathogenesis of Graves' orbitopathy (GO). It stimulates several processes, including hyaluronan synthesis, involved in orbital tissue volume expansion and may act synergistically with platelet-derived growth factor (PDGF)-BB. PDGF-BB is known to stimulate adipogenesis in orbital fibroblasts, but the effect of bFGF on adipogenesis in orbital fibroblasts is so far unknown. This study was conducted to determine whether (i) bFGF induces adipogenesis in orbital fibroblasts, (ii) bFGF and PDGF-BB together exert an additive or synergistic effect on adipogenesis, and (iii) treatment directed at bFGF- and PDGF-BB signaling may potentially be of interest for the treatment of GO. METHODS Orbital fibroblasts from GO patients and controls were cultured in adipocyte differentiation medium with or without bFGF and/or PDGF-BB at different concentrations. Adipogenesis was determined by Oil Red O staining and messenger RNA expression of the late adipocyte differentiation markers cell death-inducing DFFA-like effector C (CIDEC) and adiponectin (ADIPOQ). To demonstrate involvement of FGF-receptor and PDGF-receptor signaling, experiments were also conducted in the presence of dasatinib (inhibitor of PDGF-receptor) or nintedanib (inhibitor of PDGF-receptor and FGF-receptor). RESULTS bFGF significantly stimulated adipogenesis by orbital fibroblasts, as shown by increased Oil Red O staining and CIDEC and ADIPOQ expression after 14 days of differentiation. Furthermore, an additive effect of bFGF/PDGF-BB co-stimulation on adipogenesis was observed at the lowest concentration (12.5 ng/mL) of the growth factors tested. Nintedanib completely inhibited bFGF-, PDGF-BB-, and bFGF/PDGF-BB-induced adipogenesis, while dasatinib only fully abrogated PDGF-BB-induced adipogenesis. CONCLUSION bFGF induces adipogenesis in orbital fibroblasts and as such may contribute to GO. The additive effect of bFGF and PDGF-BB on adipogenesis, along with the observed inhibitory effects of dasatinib and nintedanib, point at independent receptor-mediated effects. This supports the hypothesis that multi-target directed therapy might be more efficient in the treatment of GO.
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Affiliation(s)
- Benjamin Schrijver
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
| | - Merel A Kooiman
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
| | - Esmee Kasteleijn
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
| | | | - Sita Virakul
- 2 Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Dion Paridaens
- 4 Academic Center for Thyroid Diseases; Rotterdam, The Netherlands
- 3 Rotterdam Eye Hospital, Rotterdam, The Netherlands
| | - Robin P Peeters
- 4 Academic Center for Thyroid Diseases; Rotterdam, The Netherlands
- 5 Department of Internal Medicine; Erasmus MC, Rotterdam, The Netherlands
| | - P Martin van Hagen
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
- 4 Academic Center for Thyroid Diseases; Rotterdam, The Netherlands
- 5 Department of Internal Medicine; Erasmus MC, Rotterdam, The Netherlands
| | - Virgil A S H Dalm
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
- 4 Academic Center for Thyroid Diseases; Rotterdam, The Netherlands
- 5 Department of Internal Medicine; Erasmus MC, Rotterdam, The Netherlands
| | - Willem A Dik
- 1 Department of Immunology, Laboratory Medical Immunology; Rotterdam, The Netherlands
- 4 Academic Center for Thyroid Diseases; Rotterdam, The Netherlands
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Lu Y, Atkins SJ, Fernando R, Trierweiler A, Mester T, Grisolia ABD, Mou P, Novaes P, Smith TJ. CD34- Orbital Fibroblasts From Patients With Thyroid-Associated Ophthalmopathy Modulate TNF-α Expression in CD34+ Fibroblasts and Fibrocytes. Invest Ophthalmol Vis Sci 2019; 59:2615-2622. [PMID: 29847668 PMCID: PMC5968835 DOI: 10.1167/iovs.18-23951] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Purpose Orbital fibroblasts from patients with Graves' disease (GD-OF) express many different cytokines when treated with bovine thyrotropin (bTSH). The present study aimed to determine why TNF-α cannot be induced by bTSH in GD-OF. Methods Fibrocytes and GD-OFs were cultivated from donors who were patients in a busy academic medical center practice. Real-time PCR, Western blot analysis, reporter gene assays, cell transfections, mRNA stability assays, ELISA, and flow cytometry were performed. Results We found that bTSH induces TNF-α dramatically in fibrocytes but is undetectable in GD-OF. The induction in fibrocytes is a consequence of increased TNF-α gene promoter activity and is independent of ongoing protein synthesis. It could be attenuated by dexamethasone and the IGF-1 receptor inhibiting antibody, teprotumumab. When separated into pure CD34+ OF and CD34- OF subsets, TNF-α mRNA became highly inducible by bTSH in CD34+ OF but remained undetectable in CD34- OF. Conditioned medium from CD34- OF inhibited induction of TNF-α in fibrocytes. Conclusions Our data indicate that CD34- OF appear to release a soluble(s) factor that downregulates expression and induction by bTSH of TNF-α in fibrocytes and their derivative CD34+ OF. We proffer that CD34- OF produce an unidentified modulatory factor that attenuates TNF-α expression in GD-OF and may do so in the TAO orbit.
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Affiliation(s)
- Yan Lu
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Stephen J Atkins
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Roshini Fernando
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Aaron Trierweiler
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Tünde Mester
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Ana Beatriz Diniz Grisolia
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Pei Mou
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Priscila Novaes
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States
| | - Terry J Smith
- Departments of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, Michigan, United States.,Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, United States
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Smith TJ, Janssen JAMJL. Insulin-like Growth Factor-I Receptor and Thyroid-Associated Ophthalmopathy. Endocr Rev 2019; 40:236-267. [PMID: 30215690 PMCID: PMC6338478 DOI: 10.1210/er.2018-00066] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 06/21/2018] [Indexed: 12/15/2022]
Abstract
Thyroid-associated ophthalmopathy (TAO) is a complex disease process presumed to emerge from autoimmunity occurring in the thyroid gland, most frequently in Graves disease (GD). It is disfiguring and potentially blinding, culminating in orbital tissue remodeling and disruption of function of structures adjacent to the eye. There are currently no medical therapies proven capable of altering the clinical outcome of TAO in randomized, placebo-controlled multicenter trials. The orbital fibroblast represents the central target for immune reactivity. Recent identification of fibroblasts that putatively originate in the bone marrow as monocyte progenitors provides a plausible explanation for why antigens, the expressions of which were once considered restricted to the thyroid, are detected in the TAO orbit. These cells, known as fibrocytes, express relatively high levels of functional TSH receptor (TSHR) through which they can be activated by TSH and the GD-specific pathogenic antibodies that underpin thyroid overactivity. Fibrocytes also express insulin-like growth factor I receptor (IGF-IR) with which TSHR forms a physical and functional signaling complex. Notably, inhibition of IGF-IR activity results in the attenuation of signaling initiated at either receptor. Some studies suggest that IGF-IR-activating antibodies are generated in GD, whereas others refute this concept. These observations served as the rationale for implementing a recently completed therapeutic trial of teprotumumab, a monoclonal inhibitory antibody targeting IGF-IR in TAO. Results of that trial in active, moderate to severe disease revealed dramatic and rapid reductions in disease activity and severity. The targeting of IGF-IR with specific biologic agents may represent a paradigm shift in the therapy of TAO.
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Affiliation(s)
- Terry J Smith
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, and Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan
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Marcinkowski P, Hoyer I, Specker E, Furkert J, Rutz C, Neuenschwander M, Sobottka S, Sun H, Nazare M, Berchner-Pfannschmidt U, von Kries JP, Eckstein A, Schülein R, Krause G. A New Highly Thyrotropin Receptor-Selective Small-Molecule Antagonist with Potential for the Treatment of Graves' Orbitopathy. Thyroid 2019; 29:111-123. [PMID: 30351237 DOI: 10.1089/thy.2018.0349] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND The thyrotropin receptor (TSHR) is the target for autoimmune thyroid stimulating antibodies (TSAb) triggering hyperthyroidism. Whereas elevated thyroid hormone synthesis by the thyroid in Graves' disease can be treated by antithyroid agents, for the pathogenic activation of TSHR in retro-orbital fibroblasts of the eye, leading to Graves' orbitopathy (GO), no causal TSHR directed therapy is available. METHODS Due to the therapeutic gap for severe GO, TSHR inhibitors were identified by high-throughput screening in Chinese hamster ovary cells expressing the TSHR. Stereo-selective synthesis of the screening hits led to the molecule S37, which contains seven chiral centers. Enantiomeric separation of the molecule S37 resulted in the enantiopure molecule S37a-a micro-molar antagonist of thyrotropin-induced cyclic adenosine monophosphate accumulation in HEK 293 cells expressing the TSHR. RESULTS The unique rigid bent shape of molecule S37a may mediate the observed high TSHR selectivity. Most importantly, the closely related follitropin and lutropin receptors were not affected by this compound. S37a not only inhibits the TSHR activation by thyrotropin itself but also activation by monoclonal TSAb M22 (human), KSAb1 (murine), and the allosteric small-molecule agonist C2. Disease-related ex vivo studies in HEK 293 cells expressing the TSHR showed that S37a also inhibits cyclic adenosine monophosphate formation by oligoclonal TSAb, which are highly enriched in GO patients' sera. Initial in vivo pharmacokinetic studies revealed no toxicity of S37a and a remarkable 53% oral bioavailability in mice. CONCLUSION In summary, a novel highly selective inhibitor for the TSHR is presented, which has promising potential for further development for the treatment of GO.
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Affiliation(s)
| | - Inna Hoyer
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Edgar Specker
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Jens Furkert
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Claudia Rutz
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | | | - Sebastian Sobottka
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Han Sun
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Marc Nazare
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | | | | | - Anja Eckstein
- 2 Department of Ophthalmology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Ralf Schülein
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
| | - Gerd Krause
- 1 Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Berlin, Germany
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Krieger CC, Morgan SJ, Neumann S, Gershengorn MC. Thyroid Stimulating Hormone (TSH)/Insulin-like Growth Factor 1 (IGF1) Receptor Cross-talk in Human Cells. CURRENT OPINION IN ENDOCRINE AND METABOLIC RESEARCH 2018; 2:29-33. [PMID: 30547142 PMCID: PMC6287758 DOI: 10.1016/j.coemr.2018.01.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Thyroid stimulating hormone and insulin-like growth factor 1 receptors (TSHRs and IGF1Rs, respectively) interact leading to additive or synergistic stimulation of cellular responses. Recent findings provide evidence that the interaction between TSHRs and IGF1Rs is similar to that described for other G protein-coupled receptors and receptor tyrosine kinases. These types of interactions occur at or proximal to the receptors and are designated "receptor cross-talk." Herein, we describe our studies in human thyrocytes, human retro-orbital fibroblasts from Graves' orbitopathy patients and a model cell line that support the concept of TSHR/IGF1R cross-talk. We also discuss how receptor cross-talk is involved in stimulation by a monoclonal TSHR-stimulating antibody and how targeting both receptors may lead to novel treatments of Graves' orbitopathy.
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Affiliation(s)
- Christine C. Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Sarah J. Morgan
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Marvin C. Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
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Abstract
PURPOSE Thyroid autoimmunity affects approximately 5% of the population, and its investigation relies heavily on the use of autoantibodies. Thyroid stimulating hormone receptor (TSHR) autoantibodies (TRAb) play a central role in the evaluation of Graves disease (GD), Graves ophthalmopathy (GO) and pretibial myxedema (PTM). However, there is still controversy regarding overall TRAb assay diagnostic accuracy and their prognostic utility. METHODS We reviewed and analyzed the literature reporting TRAb assays and their clinical utility. RESULTS Current assays measure the overall TRAb titer in a competitive manner (TSH binding inhibiting immunoglobulin assay) or biologic activity of the stimulating TSHR autoantibodies (thyroid stimulating immunoglobulin assay). Both types of assays have improved over time with advances in sensitivity and specificity. TRAb are particularly relevant in hyperthyroidism cases where use of iodinated contrast is not an option (e.g., pregnancy or recent use of iodinated contrast) or in cases of euthyroid eye disease, suspicious for GO. Third generation TRAb assays are useful for therapy selection in GD, prognostic predictions in GO and risk prediction for fetal and neonatal thyrotoxicosis. DISCUSSION Given the pathogenic role of TRAb, we expect that the future will bring useful evidence regarding their predictive role with respect to efficacy of therapeutic modalities for GO and PTM. We also hope to better understand the role of blocking and neutral antibodies against TSHR, and harness that ability for modulation of thyroid function or therapy of differentiated thyroid carcinoma managed with TSH suppression. CONCLUSIONS Thyroid autoimmune diseases have seen tremendous gains in understanding their pathophysiology, largely antibody mediated. Better TRAb testing is becoming a springboard for providing individualized patient care.
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Smith TJ. Challenges in Orphan Drug Development: Identification of Effective Therapy for Thyroid-Associated Ophthalmopathy. Annu Rev Pharmacol Toxicol 2018; 59:129-148. [PMID: 30044728 DOI: 10.1146/annurev-pharmtox-010617-052509] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Thyroid-associated ophthalmopathy (TAO), the ocular manifestation of Graves' disease, is a process in which orbital connective tissues and extraocular muscles undergo inflammation and remodeling. The condition seems to result from autoimmune responses to antigens shared by the thyroid and orbit. The thyrotropin receptor (TSHR), expressed at low levels in orbital tissues, is a leading candidate antigen. Recent evidence suggests that another protein, the insulin-like growth factor-I receptor (IGF-IR), is overexpressed in TAO, and antibodies against IGF-IR have been detected in patients with the disease. Furthermore, TSHR and IGF-IR form a physical and functional complex, and signaling initiated at TSHR requires IGF-IR activity. Identification of therapy for this rare disease has proven challenging and currently relies on nonspecific and inadequate agents, thus representing an important unmet need. A recently completed therapeutic trial suggests that inhibiting IGF-IR activity with a monoclonal antibody may be an effective and safe treatment for active TAO.
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Affiliation(s)
- Terry J Smith
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, and Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48105, USA;
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Mohyi M, Smith TJ. IGF1 receptor and thyroid-associated ophthalmopathy. J Mol Endocrinol 2018; 61:T29-T43. [PMID: 29273685 PMCID: PMC6561656 DOI: 10.1530/jme-17-0276] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 12/22/2017] [Indexed: 12/13/2022]
Abstract
Thyroid-associated ophthalmopathy (TAO) is a vexing and poorly understood autoimmune process involving the upper face and tissues surrounding the eyes. In TAO, the orbit can become inflamed and undergo substantial remodeling that is disfiguring and can lead to loss of vision. There are currently no approved medical therapies for TAO, the consequence of its uncertain pathogenic nature. It usually presents as a component of the syndrome known as Graves' disease where loss of immune tolerance to the thyrotropin receptor (TSHR) results in the generation of activating antibodies against that protein and hyperthyroidism. The role for TSHR and these antibodies in the development of TAO is considerably less well established. We have reported over the past 2 decades evidence that the insulin-like growth factorI receptor (IGF1R) may also participate in the pathogenesis of TAO. Activating antibodies against IGF1R have been detected in patients with GD. The actions of these antibodies initiate signaling in orbital fibroblasts from patients with the disease. Further, we have identified a functional and physical interaction between TSHR and IGF1R. Importantly, it appears that signaling initiated from either receptor can be attenuated by inhibiting the activity of IGF1R. These findings underpin the rationale for therapeutically targeting IGF1R in active TAO. A recently completed therapeutic trial of teprotumumab, a human IGF1R inhibiting antibody, in patients with moderate to severe, active TAO, indicates the potential effectiveness and safety of the drug. It is possible that other autoimmune diseases might also benefit from this treatment strategy.
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Affiliation(s)
- Michelle Mohyi
- Department of Ophthalmology and Visual SciencesUniversity of Michigan, Ann Arbor, Michigan, USA
| | - Terry J Smith
- Department of Ophthalmology and Visual SciencesUniversity of Michigan, Ann Arbor, Michigan, USA
- Division of MetabolismEndocrine, and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
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Marcus-Samuels B, Krieger CC, Boutin A, Kahaly GJ, Neumann S, Gershengorn MC. Evidence That Graves' Ophthalmopathy Immunoglobulins Do Not Directly Activate IGF-1 Receptors. Thyroid 2018; 28:650-655. [PMID: 29631510 PMCID: PMC5952334 DOI: 10.1089/thy.2018.0089] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Graves' ophthalmopathy (GO) pathogenesis involves thyrotropin (TSH) receptor (TSHR)-stimulating autoantibodies. Whether there are autoantibodies that directly stimulate insulin-like growth factor 1 receptors (IGF-1Rs), stimulating insulin-like growth factor receptor antibodies (IGFRAbs), remains controversial. This study attempted to determine whether there are stimulating IGFRAbs in patients with GO. METHODS Immunoglobulins (Igs) were purified from normal volunteers (NV-Igs) and patients with GO (GO-Igs). The effects of TSH, IGF-1, NV-Igs, and GO-Igs on pAKT and pERK1/2, members of pathways used by IGF-1R and TSHR, were compared in orbital fibroblasts from GO patients (GOFs) and U2OS-TSHR cells overexpressing TSHRs, and U2OS cells that express TSHRs at very low endogenous levels. U2OS-TSHR and U2OS cells were used because GOFs are not easily manipulated using molecular techniques such as transfection, and U2OS cells because they express TSHRs at levels that do not measurably stimulate signaling. Thus, comparing U2OS-TSHR and U2OS cells permits specifically distinguishing signaling mediated by the TSHR and IGF-1R. RESULTS In GOFs, all GO-Igs stimulated pERK1/2 formation and 69% stimulated pAKT. In U2OS-TSHR cells, 15% of NV-IGs and 83% of GO-Igs stimulated increases in pERK1/2, whereas all NV-Igs and GO-Igs stimulated increases in pAKT. In U2OS cells, 70% of GO-Igs stimulated small increases in pAKT. Knockdown of IGF-1R caused a 65 ± 6.3% decrease in IGF-1-stimulated pAKT but had no effect on GO-Igs stimulation of pAKT. Thus, GO-Igs contain factor(s) that stimulate pAKT formation. However, this factor(s) does not directly activate IGF-1R. CONCLUSIONS Based on the findings analyzing these two signaling pathways, it is concluded there is no evidence of stimulating IGFRAbs in GO patients.
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Affiliation(s)
- Bernice Marcus-Samuels
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Christine C. Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Alisa Boutin
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - George J. Kahaly
- Molecular Thyroid Research Laboratory, Department of Medicine I, Johannes Gutenberg University (JGU) Medical Center, Mainz, Germany
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Marvin C. Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
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Thyroid-Associated Orbitopathy and Biomarkers: Where We Are and What We Can Hope for the Future. DISEASE MARKERS 2018; 2018:7010196. [PMID: 29736194 PMCID: PMC5875031 DOI: 10.1155/2018/7010196] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 12/21/2017] [Accepted: 01/30/2018] [Indexed: 01/10/2023]
Abstract
Background Thyroid-associated orbitopathy (TAO) is the most common autoimmune disease of the orbit. It occurs more often in patients presenting with hyperthyroidism, characteristic of Graves' disease, but may be associated with hypothyroidism or euthyroidism. The diagnosis of TAO is based on clinical orbital features, radiological criteria, and the potential association with thyroid disease. To date, there is no specific marker of the orbital disease, making the early diagnosis difficult, especially if the orbital involvement precedes the thyroid dysfunction. Summary The goal of this review is to present the disease and combine the available data in the literature concerning investigation of TAO biomarkers. Conclusions Despite the progress done in the understanding of TAO disease, some important pieces are still missing. Typically, for the future, major efforts have to be done in the discovery of new biomarkers, validation of the suspected candidates on multicenter cohorts with standardized methodologies, and establishment of their clinical performances on the specific clinical application fields in order to improve not only the management of the TAO patients but also the therapeutic options and follow-up.
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Smith TJ. New advances in understanding thyroid-associated ophthalmopathy and the potential role for insulin-like growth factor-I receptor. F1000Res 2018; 7:134. [PMID: 29744034 PMCID: PMC5795270 DOI: 10.12688/f1000research.12787.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/24/2018] [Indexed: 01/15/2023] Open
Abstract
Thyroid-associated ophthalmopathy (TAO), a localized periocular manifestation of the autoimmune syndrome known as Graves’ disease, remains incompletely understood. Discussions of its pathogenesis are generally focused on the thyrotropin receptor, the proposed role for which is supported by substantial evidence. Considerations of any involvement of the insulin-like growth factor-I receptor (IGF-IR) in the disease are frequently contentious. In this brief, topically focused review, I have attempted to provide a balanced perspective based entirely on experimental results that either favor or refute involvement of IGF-IR in TAO. Discussion in this matter seems particularly timely since the currently available treatments of this disfiguring and potentially sight-threatening disease remain inadequate. Importantly, no medical therapy has thus far received approval from the US Food and Drug Administration. Results from a very recently published clinical trial assessing the safety and efficacy of teprotumumab, an inhibitory human anti–IGF-IR monoclonal antibody, in active, moderate to severe TAO are extremely encouraging. That double-masked, placebo-controlled study involved 88 patients and revealed unprecedented clinical responses in the improvement of proptosis and clinical activity as well as a favorable safety profile. Should those results prove reproducible in an ongoing phase III trial, therapeutic inhibition of IGF-IR could become the basis for paradigm-shifting treatment of this vexing disease.
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Affiliation(s)
- Terry J Smith
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center and Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI 48105, USA
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Neumann S, Gershengorn MC. Rebuttal to Smith and Janssen (Thyroid 2017;27:746-747. DOI: 10.1089/thy.2017.0281). Thyroid 2017; 27:1459-1460. [PMID: 28922977 PMCID: PMC5695741 DOI: 10.1089/thy.2017.0472] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institutes of Diabetes, Digestive, and Kidney, National Institutes of Health , Bethesda, Maryland
| | - Marvin C Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institutes of Diabetes, Digestive, and Kidney, National Institutes of Health , Bethesda, Maryland
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Oeverhaus M, Witteler T, Lax H, Esser J, Führer D, Eckstein A. Combination Therapy of Intravenous Steroids and Orbital Irradiation is More Effective Than Intravenous Steroids Alone in Patients with Graves' Orbitopathy. Horm Metab Res 2017; 49:739-747. [PMID: 28922676 DOI: 10.1055/s-0043-116945] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The aim of this study was to evaluate and compare the efficacy of intravenous (iv) glucocorticoids (GCs) with and without orbital radiotherapy (ORT) in a retrospective analysis of patients with active, moderate-to-severe Graves' orbitopathy (GO). Since diplopia has the strongest impact on quality of life, a careful work up of motility and binocular single vision (BSV) has been performed. The Essen-EUGOGO-Center database (n=3655) was screened for patients with untreated moderate-to-severe, active GO, onset ≤12 months. The inclusion criteria were met by 148 patients (n=76 ivGC, n=72 ivGC + ORT). We analyzed CAS (inactivation: ≤2), NOSPECS, lid-width, proptosis, motility, and field of BSV. To score the overall ophthalmic outcome, a severity-weighted-score (SOS) was compared with an established EUGOGO inflammation-weighted-score (IOS). Cumulative ivGCs dosages and duration of GO did not differ between the groups. Patients with combination therapy had a significantly more severe GO at baseline. Therefore, a subgroup with matched severity was additionally compared. In the IOS, both groups reached similar improvement rates (55.2 vs. 63.9%; p=0.31). However, in the SOS, the rates differed significantly (46.1 vs. 61.1%; p=0.03- unmatched and p=0.03 matched), despite similar rates of inactivation (65.8 vs. 63.8%). Impaired motility improved significantly more often after combination therapy (p=0.01 matched, p=0.004 unmatched). Treatment responders showed only partial improvement (proptosis: 2.5±0.5 mm; motility: 11.3±10.9°). In our retrospective analysis, combination therapy (ivGCs + ORT) was significantly more effective in reduction of severity and should therefore always be considered in moderate-to-severe GO stages, especially in the presence of motility disorders. However, the limited improvement in clinical parameters, despite the promising effect on inactivation of inflammation, has to be outlined to the patients.
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Affiliation(s)
- Michael Oeverhaus
- Department of Ophthalmology, University Hospital Essen (EUGOGO Center Essen), Essen, Germany
| | - Tobias Witteler
- Department of Ophthalmology, University Hospital Essen (EUGOGO Center Essen), Essen, Germany
- Department of Medical Oncology, Kliniken Essen-Mitte, Essen, Germany
| | - Hildegard Lax
- Institute of Medical Informatics, Biometry and Epidemiology, University of Duisburg-Essen, Essen, Germany
| | - Joachim Esser
- Department of Ophthalmology, University Hospital Essen (EUGOGO Center Essen), Essen, Germany
| | - Dagmar Führer
- Department of Endocrinology and Metabolism, University Hospital Essen, (EUGOGO Center Essen) University Duisburg-Essen, Essen, Germany
| | - Anja Eckstein
- Department of Ophthalmology, University Hospital Essen (EUGOGO Center Essen), Essen, Germany
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Krieger CC, Perry JD, Morgan SJ, Kahaly GJ, Gershengorn MC. TSH/IGF-1 Receptor Cross-Talk Rapidly Activates Extracellular Signal-Regulated Kinases in Multiple Cell Types. Endocrinology 2017; 158:3676-3683. [PMID: 28938449 PMCID: PMC5659693 DOI: 10.1210/en.2017-00528] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/08/2017] [Indexed: 12/25/2022]
Abstract
We previously showed that thyrotropin (TSH)/insulinlike growth factor (IGF)-1 receptor cross-talk appears to be involved in Graves' orbitopathy (GO) pathogenesis and upregulation of thyroid-specific genes in human thyrocytes. In orbital fibroblasts from GO patients, coadministration of TSH and IGF-1 induces synergistic increases in hyaluronan secretion. In human thyrocytes, TSH plus IGF-1 synergistically increased expression of the sodium-iodide symporter that appeared to involve ERK1/2 activation. However, the details of ERK1/2 activation were not known, nor was whether ERK1/2 was involved in this synergism in other cell types. Using primary cultures of GO fibroblasts (GOFs) and human thyrocytes, as well as human embryonic kidney (HEK) 293 cells overexpressing TSH receptors (HEK-TSHRs), we show that simultaneous activation of TSHRs and IGF-1 receptors (IGF-1Rs) causes rapid, synergistic phosphorylation/activation of ERK1 and ERK2 in all three cell types. This effect is partially inhibited by pertussis toxin, an inhibitor of TSHR coupling to Gi/Go proteins. In support of a role for Gi/Go proteins in ERK1/2 phosphorylation, we found that knockdown of Gi(1-3) and Go in HEK-TSHRs inhibited ERK1/2 phosphorylation stimulated by TSH and TSH plus IGF-1. These data demonstrate that the synergistic effects of TSH plus IGF-1 occur early in the TSHR signaling cascade and further support the idea that TSHR/IGF-1R cross-talk is an important mechanism for regulation of human GOFs and thyrocytes.
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Affiliation(s)
- Christine C. Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892
| | - Joseph D. Perry
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892
| | - Sarah J. Morgan
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892
| | - George J. Kahaly
- Molecular Thyroid Research Laboratory, Department of Medicine I, Johannes Gutenberg University Medical Center, Langenbeckstreet 1, 55131 Mainz, Germany
| | - Marvin C. Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892
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Smith TJ, Kahaly GJ, Ezra DG, Fleming JC, Dailey RA, Tang RA, Harris GJ, Antonelli A, Salvi M, Goldberg RA, Gigantelli JW, Couch SM, Shriver EM, Hayek BR, Hink EM, Woodward RM, Gabriel K, Magni G, Douglas RS. Teprotumumab for Thyroid-Associated Ophthalmopathy. N Engl J Med 2017; 376:1748-1761. [PMID: 28467880 PMCID: PMC5718164 DOI: 10.1056/nejmoa1614949] [Citation(s) in RCA: 426] [Impact Index Per Article: 60.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Thyroid-associated ophthalmopathy, a condition commonly associated with Graves' disease, remains inadequately treated. Current medical therapies, which primarily consist of glucocorticoids, have limited efficacy and present safety concerns. Inhibition of the insulin-like growth factor I receptor (IGF-IR) is a new therapeutic strategy to attenuate the underlying autoimmune pathogenesis of ophthalmopathy. METHODS We conducted a multicenter, double-masked, randomized, placebo-controlled trial to determine the efficacy and safety of teprotumumab, a human monoclonal antibody inhibitor of IGF-IR, in patients with active, moderate-to-severe ophthalmopathy. A total of 88 patients were randomly assigned to receive placebo or active drug administered intravenously once every 3 weeks for a total of eight infusions. The primary end point was the response in the study eye. This response was defined as a reduction of 2 points or more in the Clinical Activity Score (scores range from 0 to 7, with a score of ≥3 indicating active thyroid-associated ophthalmopathy) and a reduction of 2 mm or more in proptosis at week 24. Secondary end points, measured as continuous variables, included proptosis, the Clinical Activity Score, and results on the Graves' ophthalmopathy-specific quality-of-life questionnaire. Adverse events were assessed. RESULTS In the intention-to-treat population, 29 of 42 patients who received teprotumumab (69%), as compared with 9 of 45 patients who received placebo (20%), had a response at week 24 (P<0.001). Therapeutic effects were rapid; at week 6, a total of 18 of 42 patients in the teprotumumab group (43%) and 2 of 45 patients in the placebo group (4%) had a response (P<0.001). Differences between the groups increased at subsequent time points. The only drug-related adverse event was hyperglycemia in patients with diabetes; this event was controlled by adjusting medication for diabetes. CONCLUSIONS In patients with active ophthalmopathy, teprotumumab was more effective than placebo in reducing proptosis and the Clinical Activity Score. (Funded by River Vision Development and others; ClinicalTrials.gov number, NCT01868997 .).
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Affiliation(s)
- Terry J Smith
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - George J Kahaly
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Daniel G Ezra
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - James C Fleming
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Roger A Dailey
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Rosa A Tang
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Gerald J Harris
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Alessandro Antonelli
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Mario Salvi
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Robert A Goldberg
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - James W Gigantelli
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Steven M Couch
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Erin M Shriver
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Brent R Hayek
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Eric M Hink
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Richard M Woodward
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Kathleen Gabriel
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Guido Magni
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
| | - Raymond S Douglas
- From the Department of Ophthalmology and Visual Sciences, Kellogg Eye Center (T.J.S., R.S.D.), and the Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine (T.J.S.), University of Michigan Medical School, Ann Arbor; the Department of Medicine, Johannes Gutenberg University Medical Center, Mainz, Germany (G.J.K.); Moorfields Eye Hospital, London (D.G.E.); the University of Tennessee Health Science Center, Memphis (J.C.F.); the Oculofacial Plastic Surgery Division, Oregon Health and Science University, Portland (R.A.D.); Eye Wellness Center, Neuro-Ophthalmology of Texas, Houston (R.A.T.); the Department of Ophthalmology, Medical College of Wisconsin, Milwaukee (G.J.H.); the Department of Clinical and Experimental Medicine, University of Pisa, Pisa (A.A.), and the Endocrinology and Diabetology Unit, Fondazione IRCCS Ca' Granda, University of Milan, Milan (M.S.) - both in Italy; the Jules Stein Eye Institute, University of California, Los Angeles, Los Angeles (R.A.G.); the University of Nebraska Medical Center, Omaha (J.W.G.); Barnes-Jewish Hospital, Washington University, St. Louis (S.M.C.); the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (E.M.S.); the Department of Ophthalmology, Emory University, Atlanta (B.R.H.); the Department of Ophthalmology, University of Colorado, Aurora (E.M.H.); and River Vision Development, New York (R.M.W., K.G., G.M.)
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Krieger CC, Neumann S, Marcus-Samuels B, Gershengorn MC. TSHR/IGF-1R Cross-Talk, Not IGF-1R Stimulating Antibodies, Mediates Graves' Ophthalmopathy Pathogenesis. Thyroid 2017; 27:746-747. [PMID: 28346855 PMCID: PMC5421635 DOI: 10.1089/thy.2017.0105] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Christine C Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Bernice Marcus-Samuels
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Marvin C Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
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Abstract
INTRODUCTION Graves' disease (GD) and thyroid-associated ophthalmopathy (TAO) are thought to result from actions of pathogenic antibodies mediated through the thyrotropin receptor (TSHR). This leads to the unregulated consequences of the antibody-mediated receptor activity in the thyroid and connective tissues of the orbit. Recent studies reveal antibodies that appear to be directed against the insulin-like growth factor-I receptor (IGF-IR). Areas covered: In this brief article, I attempt to review the fundamental characteristics of the TSHR, its role in GD and TAO, and its relationship to IGF-IR. Strong evidence supports the concept that the two receptors form a physical and functional complex and that IGF-IR activity is required for some of the down-stream signaling initiated through TSHR. Recently developed small molecules and monoclonal antibodies that block TSHR and IGF-IR signaling are also reviewed in the narrow context of their potential utility as therapeutics in GD and TAO. The Pubmed database was searched from its inception for relevant publications. Expert opinion: Those agents that can interrupt the TSHR and IGF-IR pathways possess the potential for offering more specific and better tolerated treatments of both hyperthyroidism and TAO. This would spare patients exposure to toxic drugs, ionizing radiation and potentially hazardous surgeries.
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Affiliation(s)
- Terry Smith
- a Department of Ophthalmology and Visual Sciences , University of Michigan , Ann Arbor , MI , USA
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Place RF, Krieger CC, Neumann S, Gershengorn MC. Inhibiting thyrotropin/insulin-like growth factor 1 receptor crosstalk to treat Graves' ophthalmopathy: studies in orbital fibroblasts in vitro. Br J Pharmacol 2017; 174:328-340. [PMID: 27987211 DOI: 10.1111/bph.13693] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 12/05/2016] [Accepted: 12/14/2016] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND AND PURPOSE Crosstalk between thyrotropin (TSH) receptors and insulin-like growth factor 1 (IGF-1) receptors initiated by activation of TSH receptors could be important in the development of Graves' ophthalmopathy (GO). Specifically, TSH receptor activation alone is sufficient to stimulate hyaluronic acid (HA) secretion, a major component of GO, through both IGF-1 receptor-dependent and -independent pathways. Although an anti-IGF-1 receptor antibody is in clinical trials, its effectiveness depends on the relative importance of IGF-1 versus TSH receptor signalling in GO pathogenesis. EXPERIMENTAL APPROACH TSH and IGF-1 receptor antagonists were used to probe TSH/IGF-1 receptor crosstalk in primary cultures of Graves' orbital fibroblasts (GOFs) following activation with monoclonal TSH receptor antibody, M22. Inhibition of HA secretion following TSH receptor stimulation was measured by modified HA elisa. KEY RESULTS TSH receptor antagonist, ANTAG3 (NCGC00242364), inhibited both IGF-1 receptor -dependent and -independent pathways at all doses of M22; whereas IGF-1 receptor antagonists linsitinib and 1H7 (inhibitory antibody) lost efficacy at high M22 doses. Combining TSH and IGF-1 receptor antagonists exhibited Loewe additivity within the IGF-1 receptor-dependent component of the M22 concentration-response. Similar effects were observed in GOFs activated by autoantibodies from GO patients' sera. CONCLUSIONS AND IMPLICATIONS Our data support TSH and IGF-1 receptors as therapeutic targets for GO, but reveal putative conditions for anti-IGF-1 receptor resistance. Combination treatments antagonizing both receptors yield additive effects by inhibiting crosstalk triggered by TSH receptor stimulatory antibodies. Combination therapy may be an effective strategy for dose reduction and/or compensate for any loss of anti-IGF-1 receptor efficacy.
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Affiliation(s)
- Robert F Place
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Christine C Krieger
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Marvin C Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health (NIH), Bethesda, MD, USA
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80
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Abstract
Hyperthyroidism is a form of thyrotoxicosis in which there is excess thyroid hormone synthesis and secretion. Multiple etiologies can lead to a common clinical state of "thyrotoxicosis," which is a consequence of the high thyroid hormone levels and their action on different tissues of the body. The most common cause of thyrotoxicosis is Graves' disease, an autoimmune disorder in which stimulating thyrotropin receptor antibodies bind to thyroid stimulating hormone (TSH) receptors on thyroid cells and cause overproduction of thyroid hormones. Other etiologies include: forms of thyroiditis in which inflammation causes release of preformed hormone, following thyroid gland insult that is autoimmune, infectious, mechanical or medication induced; secretion of human chorionic gonadotropin in the setting of transient gestational thyrotoxicosis and trophoblastic tumors; pituitary thyrotropin release, and exposure to extra-thyroidal sources of thyroid hormone that may be endogenous or exogenous. © 2017 American Physiological Society. Compr Physiol 7:67-79, 2017.
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Affiliation(s)
- Ishita Singh
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, David Geffen School of Medicine at UCLA and VA Greater Los Angeles Healthcare Systems, Los Angeles, California, USA
| | - Jerome M Hershman
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, David Geffen School of Medicine at UCLA and VA Greater Los Angeles Healthcare Systems, Los Angeles, California, USA
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81
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Morgan SJ, Neumann S, Marcus-Samuels B, Gershengorn MC. Thyrotropin and Insulin-Like Growth Factor 1 Receptor Crosstalk Upregulates Sodium-Iodide Symporter Expression in Primary Cultures of Human Thyrocytes. Thyroid 2016; 26:1794-1803. [PMID: 27638195 PMCID: PMC5175432 DOI: 10.1089/thy.2016.0323] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Major regulation of thyroid gland function is mediated by thyrotropin (TSH) activating the TSH receptor (TSHR) and inducing upregulation of genes involved in thyroid hormone synthesis. Evidence suggests that the insulin-like growth factor 1 (IGF-1) receptor (IGF-1R) may play a role in regulating TSHR functional effects. This study examined the potential role of TSHR/IGF-1R crosstalk in primary cultures of human thyrocytes. RESULTS TSH/IGF-1 co-treatment elicited additive effects on thyroglobulin (TG), thyroperoxidase (TPO), and deiodinase type 2 (DIO2) mRNA levels but synergistic effects on sodium-iodide symporter (NIS) mRNA. Similar cooperativity was seen on the level of TG protein secretion (additive) and NIS protein expression (synergistic). The IGF-1R tyrosine kinase inhibitor linsitinib inhibited TSH-stimulated upregulation of NIS but not TG, indicating that NIS regulation is in part IGF-1R dependent and occurs via receptor crosstalk. Cooperativity was not seen at the level of cAMP/protein kinase A (PKA) signaling, IGF-1R phosphorylation, or Akt activation. However, TSH and IGF-1 synergistically activated ERK1/2. Pharmacological inhibition of ERK1/2 by the MEK1/2 inhibitor U0126 and of Akt by MK-2206 virtually abolished NIS stimulation by TSH and the synergistic effect of IGF-1. CONCLUSION As linsitinib inhibited upregulation of NIS stimulated by TSH alone, it is concluded that crosstalk between TSHR and IGF-1R, without agonist activation of IGF-1R, plays a role in NIS regulation in human thyrocytes via a mechanism involving ERK1/2 and/or Akt. Fully understanding the nature of this crosstalk has clinical implications for the treatment of thyroid diseases, including thyroid cancer.
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Affiliation(s)
- Sarah J Morgan
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Susanne Neumann
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Bernice Marcus-Samuels
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
| | - Marvin C Gershengorn
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland
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Novaes P, Diniz Grisolia AB, Smith TJ. Update on thyroid-associated Ophthalmopathy with a special emphasis on the ocular surface. Clin Diabetes Endocrinol 2016; 2:19. [PMID: 28702253 PMCID: PMC5471935 DOI: 10.1186/s40842-016-0037-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/10/2016] [Indexed: 01/08/2023] Open
Abstract
Thyroid-associated ophthalmopathy (TAO) is a condition associated with a wide spectrum of ocular changes, usually in the context of the autoimmune syndrome, Graves’ disease. In this topical review, we attempted to provide a roadmap of the recent advances in current understanding the pathogenesis of TAO, important aspects of its clinical presentation, its impact on the ocular surface, describe the tissue abnormalities frequently encountered, and describe how TAO is managed today. We also briefly review how increased understanding of the disease should culminate in improved therapies for patients with this vexing condition.
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Affiliation(s)
- Priscila Novaes
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI 48105 USA
| | - Ana Beatriz Diniz Grisolia
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI 48105 USA
| | - Terry J Smith
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan Medical School, Ann Arbor, MI 48105 USA.,Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI 48105 USA.,Department of Ophthalmology and Visual Sciences, Brehm Tower, Room 7112, 1000 Wall Street, Ann Arbor, MI 48105 USA
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83
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Moleti M, Sturniolo G, Vermiglio F. Safety of total thyroid ablation in patients with Graves' orbitopathy. J Endocrinol Invest 2016; 39:1199-201. [PMID: 27206633 DOI: 10.1007/s40618-016-0485-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 05/09/2016] [Indexed: 10/21/2022]
Affiliation(s)
- M Moleti
- Dipartimento di Medicina Clinica e Sperimentale, University of Messina, Messina, Italy
| | - G Sturniolo
- Dipartimento di Medicina Clinica e Sperimentale, University of Messina, Messina, Italy
- Dipartimento di Patologia Umana dell'adulto e dell'età evolutiva "Gaetano Barresi", University of Messina, Via Consolare Valeria 1, 98125, Messina, Italy
| | - F Vermiglio
- Dipartimento di Medicina Clinica e Sperimentale, University of Messina, Messina, Italy.
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84
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Spaulding SW. Patients with TSH-Receptor Blocking Antibodies Give a “Positive” Result for Stimulating Activity in Several Commercial Assays. ACTA ACUST UNITED AC 2016. [DOI: 10.1089/ct.2016;28.206-207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Smith TJ, Janssen JAMJL. Building the Case for Insulin-Like Growth Factor Receptor-I Involvement in Thyroid-Associated Ophthalmopathy. Front Endocrinol (Lausanne) 2016; 7:167. [PMID: 28096798 PMCID: PMC5206614 DOI: 10.3389/fendo.2016.00167] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 12/13/2016] [Indexed: 11/18/2022] Open
Abstract
The pathogenesis of orbital Graves' disease (GD), a process known as thyroid-associated ophthalmopathy (TAO), remains incompletely understood. The thyrotropin receptor (TSHR) represents the central autoantigen involved in GD and has been proposed as the thyroid antigen shared with the orbit that could explain the infiltration of immune cells into tissues surrounding the eye. Another cell surface protein, insulin-like growth factor-I receptor (IGF-IR), has recently been proposed as a second antigen that participates in TAO by virtue of its interactions with anti-IGF-IR antibodies generated in GD, its apparent physical and functional complex formation with TSHR, and its necessary involvement in TSHR post-receptor signaling. The proposal that IGF-IR is involved in TAO has provoked substantial debate. Furthermore, several studies from different laboratory groups, each using different experimental models, have yielded conflicting results. In this article, we attempt to summarize the biological characteristics of IGF-IR and TSHR. We also review the evidence supporting and refuting the postulate that IGF-IR is a self-antigen in GD and that it plays a potentially important role in TAO. The putative involvement of IGF-IR in disease pathogenesis carries substantial clinical implications. Specifically, blocking this receptor with monoclonal antibodies can dramatically attenuate the induction by TSH and pathogenic antibodies generated in GD of proinflammatory genes in cultured orbital fibroblasts and fibrocytes. These cell types appear critical to the development of TAO. These observations have led to the conduct of a now-completed multicenter therapeutic trial of a fully human monoclonal anti-IGF-IR blocking antibody in moderate to severe, active TAO.
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Affiliation(s)
- Terry J. Smith
- Department of Ophthalmology and Visual Sciences, Division of Metabolism, Endocrinology, and Diabetes, University of Michigan Medical School, Ann Arbor, MI, USA
- Department of Internal Medicine, Division of Metabolism, Endocrinology, and Diabetes, University of Michigan Medical School, Ann Arbor, MI, USA
- *Correspondence: Terry J. Smith,
| | - Joseph A. M. J. L. Janssen
- Department of Internal Medicine, Erasmus Medical Center, Division of Endocrinology, Rotterdam, Netherlands
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