1
|
Hopperstad K, Truschel T, Wahlicht T, Stewart W, Eicher A, May T, Deisenroth C. Characterization of Novel Human Immortalized Thyroid Follicular Epithelial Cell Lines. APPLIED IN VITRO TOXICOLOGY 2021; 7:39-49. [PMID: 35663474 PMCID: PMC9157743 DOI: 10.1089/aivt.2020.0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
INTRODUCTION Investigation of normal human thyroid function using in vitro culture systems is dependent on cells that recapitulate physiology of differentiated thyrocytes. Primary thyrocytes retain features of the native organ but have limited lifespan in culture. Immortalized thyrocytes offer an alternative if challenges maintaining phenotypic stability can be overcome to retain functional features of primary cells. MATERIALS AND METHODS CI-SCREEN immortalization technology was applied to normal human thyroid tissue to generate four cell line variants. The lines were characterized for transgene integration, biomarker expression, genomic stability, and proliferation rates. Thyroid Stimulating Hormone (TSH)-dependent morphology, thyroglobulin production, thyroxine hormone synthesis, and viability were assessed using conventional 2D monolayer and 3D microtissue culture formats in huThyrEC or h7H medium. RESULTS Despite differential transgene profiles, the lines had similar biomarker expression patterns and proliferation rates. In 2D culture there was no thyroxine synthesis or changes in viability, but TSH-dependent thyroglobulin production was more significant for several lines in h7H than huThyrEC medium. Comparatively, in 3D microtissues, TSH-dependent thyroglobulin induction was greater for cell lines in h7H medium. Synthesis of thyroxine in one cell line was higher than background with TSH exposure, but not significantly different than control. DISCUSSION Immortalization of primary human thyrocytes yielded transgenic lines of epithelial origin. When evaluated in 2D or 3D culture formats, h7H medium supported thyroglobulin production to a greater magnitude than huThyrEC medium. One cell line cultured in 3D microtissue format marginally recapitulated T4 synthesis under continuous TSH exposure. CONCLUSION Select human thyroid cell lines exhibited morphological and functional features of primary thyrocytes and are a novel resource for in vitro disease modeling and toxicity testing that will enable reproducible culture models more representative of normal human thyroid function.
Collapse
Affiliation(s)
- Kristen Hopperstad
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States
| | | | - Tom Wahlicht
- InSCREENeX GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Wendy Stewart
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States
| | - Andrew Eicher
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States
| | - Tobias May
- InSCREENeX GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Chad Deisenroth
- Center for Computational Toxicology and Exposure, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States
| |
Collapse
|
2
|
Deisenroth C, Soldatow VY, Ford J, Stewart W, Brinkman C, LeCluyse EL, MacMillan DK, Thomas RS. Development of an In Vitro Human Thyroid Microtissue Model for Chemical Screening. Toxicol Sci 2020; 174:63-78. [PMID: 31808822 PMCID: PMC8061085 DOI: 10.1093/toxsci/kfz238] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Thyroid hormones (TH) are essential for regulating a number of diverse physiological processes required for normal growth, development, and metabolism. The US EPA Endocrine Disruptor Screening Program (EDSP) has identified several molecular thyroid targets relevant to hormone synthesis dynamics that have been adapted to high-throughput screening (HTS) assays to rapidly evaluate the ToxCast/Tox21 chemical inventories for potential thyroid disrupting chemicals (TDCs). The uncertainty surrounding the specificity of active chemicals identified in these screens and the relevance to phenotypic effects on in vivo human TH synthesis are notable data gaps for hazard identification of TDCs. The objective of this study was to develop a medium-throughput organotypic screening assay comprised of reconstructed human thyroid microtissues to quantitatively evaluate the disruptive effects of chemicals on TH production and secretion. Primary human thyroid cells procured from qualified euthyroid donors were analyzed for retention of NK2 homeobox 1 (NKX2-1), Keratin 7 (KRT7), and Thyroglobulin (TG) protein expression by high-content image analysis to verify enrichment of follicular epithelial cells. A direct comparison of 2-dimensional (2D) and 3-dimensional (3D) 96-well culture formats was employed to characterize the morphology, differential gene expression, TG production, and TH synthesis over the course of 20 days. The results indicate that modeling human thyroid cells in the 3D format was sufficient to restore TH synthesis not observed in the 2D culture format. Inhibition of TH synthesis in an optimized 3D culture format was demonstrated with reference chemicals for key molecular targets within the thyroid gland. Implementation of the assay may prove useful for interpreting phenotypic effects of candidate TDCs identified by HTS efforts currently underway in the EDSP.
Collapse
Affiliation(s)
- Chad Deisenroth
- National Center for Computational Toxicology, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | | | - Jermaine Ford
- Research Cores Unit, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Research Triangle Park, North Carolina 27711
| | - Wendy Stewart
- National Center for Computational Toxicology, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | - Cassandra Brinkman
- National Center for Computational Toxicology, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| | | | - Denise K. MacMillan
- Research Cores Unit, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Research Triangle Park, North Carolina 27711
| | - Russell S. Thomas
- National Center for Computational Toxicology, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711
| |
Collapse
|
3
|
Sebai H, Ristorcelli E, Sbarra V, Hovsepian S, Fayet G, Aouani E, Lombardo D. Protective effect of resveratrol against LPS-induced extracellular lipoperoxidation in AR42J cells partly via a Myd88-dependent signaling pathway. Arch Biochem Biophys 2009; 495:56-61. [PMID: 20035708 DOI: 10.1016/j.abb.2009.12.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Revised: 12/13/2009] [Accepted: 12/16/2009] [Indexed: 01/21/2023]
Abstract
Lipopolysaccharides (LPS) are major components of the cell wall of Gram negative bacteria implicated in the pathogenesis of bacterial infection. Resveratrol is a polyphenolic phytoalexin exhibiting antioxidant and anti-inflammatory properties. We investigated the protective effects of this natural compound on LPS-induced proinflammatory effect using non-myeloid AR42J pancreatic cells. We found that LPS dose-dependently increased extracellular malondialdehyde (MDA) and nitric oxide without affecting their intracellular level whereas resveratrol abolished all these deleterious effects. LPS increased CD14 expression; IRAK1 and a phosphorylated form of p38 MAPK protein. Resveratrol counteracted LPS effect by decreasing CD14 and IRAK1 expression but unexpectedly increased the p38 MAPK protein phosphorylation. Altogether, our data highlighted the functionality of the TLR4-Myd88 signaling pathway in LPS pro-oxidant effect using non-myeloid cells. They further suggested that resveratrol exerted antioxidant properties either by a Myd88-dependent way not involving IRAK1 or by a TRIF dependent pathway.
Collapse
Affiliation(s)
- Hichem Sebai
- INSERM UMR-911 CRO2, Aix-Marseille Université, Faculté de Médecine-Timone, 27 Bld Jean Moulin, 13385 Marseille Cedex 05, France.
| | | | | | | | | | | | | |
Collapse
|
4
|
Fayet G, Hovsépian S. Isolation of a normal human thyroid cell line: hormonal requirement for thyroglobulin regulation. Thyroid 2002; 12:539-46. [PMID: 12193296 DOI: 10.1089/105072502320288375] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The long-term culture of functional follicular cells from normal adult human thyroid tissue has been obtained. They were expanded using a 1:2 split ratio until passage 28 (present status) in Click-RPMI medium enhanced with 5% fetal calf serum and diverse associations of hormones or components including porcine insulin and bovine thyrotropin. At passages 10 and 20, chromosome countings showed a normal diploid number and a normal karyotype. In calf serum containing media, cells are epithelial in the presence of thyrotropin (TSH) but present a slight elongated form in the absence of TSH. In serum-free media, 30 minutes after TSH stimulation, both epithelial and elongated cells changed in morphology to stellate-shaped, arborized forms, indicating the presence of functional TSH-receptors even in long term (18 months) TSH-free cultures. Cells produce thyroglobulin constitutively and large amounts of thyroglobulin are easily recovered in TSH-supplemented media, especially in the presence of insulin. Thyroglobulin production was increased versus days under TSH or insulin stimulation. Combination of the two hormones clearly resulted in a synergistic and not an additive effect. The other hormones present in the 6H components (transferrin, glycylhistidyl-lysine, somatostatin, and hydrocortisone) had no positive effect on thyroglobulin accumulation in media in our experimental conditions. Addition of TSH to hormone-free cultures or to insulin-, insulin plus hydrocortisone-, or 5H-containing cultures resulted in a clear increase in thyroglobulin production. Withdrawal of TSH from 6H cultures resulted in a decrease in thyroglobulin accumulation in media. Six months were required to select fibroblast-free cultures and to get passage 6. But only 17 months separated passage 6 to passage 28, indicating that the proliferative rate is increasing with in vitro cell adaptation. Such normal adult thyroid cells, thyroglobulin-producing, TSH, and insulin-sensitive, represent a new normal human thyroid cell line allowing comparative studies with cells originating from pathologic thyroid tissues.
Collapse
Affiliation(s)
- G Fayet
- Laboratoire de Biochimie et de Biologie Moléculaire du Centre et Unité INSERM 559, Faculté de Médecine, Marseille, France.
| | | |
Collapse
|
5
|
Kimura T, Van Keymeulen A, Golstein J, Fusco A, Dumont JE, Roger PP. Regulation of thyroid cell proliferation by TSH and other factors: a critical evaluation of in vitro models. Endocr Rev 2001; 22:631-56. [PMID: 11588145 DOI: 10.1210/edrv.22.5.0444] [Citation(s) in RCA: 297] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
TSH via cAMP, and various growth factors, in cooperation with insulin or IGF-I stimulate cell cycle progression and proliferation in various thyrocyte culture systems, including rat thyroid cell lines (FRTL-5, WRT, PC Cl3) and primary cultures of rat, dog, sheep and human thyroid. The available data on cell signaling cascades, cell cycle kinetics, and cell cycle-regulatory proteins are thoroughly and critically reviewed in these experimental systems. In most FRTL-5 cells, TSH (cAMP) merely acts as a priming/competence factor amplifying PI3K and MAPK pathway activation and DNA synthesis elicited by insulin/IGF-I. In WRT cells, TSH and insulin/IGF-I can independently activate Ras and PI3K pathways and DNA synthesis. In dog thyroid primary cultures, TSH (cAMP) does not activate Ras and PI3K, and cAMP must be continuously elevated by TSH to directly control the progression through G(1) phase. This effect is exerted, at least in part, via the cAMP-dependent activation of the required cyclin D3, itself synthesized in response to insulin/IGF-I. This and other discrepancies show that the mechanistic logics of cell cycle stimulation by cAMP profoundly diverge in these different in vitro models of the same cell. Therefore, although these different thyrocyte systems constitute interesting models of the wide diversity of possible mechanisms of cAMP-dependent proliferation in various cell types, extrapolation of in vitro mechanistic data to TSH-dependent goitrogenesis in man can only be accepted in the cases where independent validation is provided.
Collapse
Affiliation(s)
- T Kimura
- Institute of Interdisciplinary Research (IRIBHN), School of Medicine, Université Libre de Bruxelles, Campus Erasme, B-1070 Brussels, Belgium
| | | | | | | | | | | |
Collapse
|
6
|
Aouani A, Samih N, Amphoux-Fazekas T, Hovsépian S, Fayet G. Hexamethylenebisacetamide modulation of thyroglobulin and protein levels in thyroid cells is not mediated by phosphatidylinositol-3-kinase: a study with wortmannin. Arch Physiol Biochem 1999; 107:77-83. [PMID: 10650339 DOI: 10.1076/apab.107.2.77.4340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Hexamethylenebisacetamide (HMBA) induces in murine erythroleukemia cells (MELC) the commitment to terminal differentiation leading to globin gene expression. In the thyroid, HMBA acts as a growth factor and also as a differentiating agent. In the present paper, we studied the effect of HMBA on the very specific thyroid marker thyroglobulin (Tg) in two different thyroid cell systems, i.e., porcine cells in primary culture and ovine cells in long term culture. Using wortmannin, a specific inhibitor of phosphatidylinositol-3-kinase, we investigated whether this enzyme is involved in HMBA mode of action. We found that HMBA is a positive modulator of Tg production in porcine cells, but a negative effector in the OVNIS cell line. As all HMBA effects studied in the present paper, i.e., Tg production and total protein levels, are not inhibited by wortmannin, we suggest the non-involvement of phosphatidylinositol-3-kinase in HMBA mode of action.
Collapse
Affiliation(s)
- A Aouani
- Faculté de Medecine, Laboratoire de Recherches en Nutrition U 260 INSERM, Marseille, 13385, France. Mohamed.Amri.@fst.rnu.tn
| | | | | | | | | |
Collapse
|
7
|
Fayet G, Amphoux-Fazekas T, Aouani A, Hovsépian S. Hexamethylenebisacetamide (HMBA) is a growth factor for human, ovine and porcine thyroid cells. Mol Cell Endocrinol 1996; 117:111-6. [PMID: 8734479 DOI: 10.1016/0303-7207(95)03732-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Hexamethylenebisacetamide (HMBA) provokes in murine erythroleukemia cells (MELC) a commitment to terminal differentiation leading to the activation of the expression of hemoglobin. HMBA has been tested also in other cells from colon cancer, melanoma or lung cancer. However it has not yet been tested in the thyroid. We demonstrate in this paper that HMBA in kinetics and concentration-response experiments increases the proliferation of human thyroid cells isolated from Graves'-Basedow patients. It also acts like a growth factor for ovine and porcine thyroid cells, respectively, from the OVNIS line and the ATHOS line. This molecule which is a differentiating factor in the MELC system and a growth factor in human thyroid cell cultures represents a potential to get human thyroid cell lines expressing specialized functions.
Collapse
Affiliation(s)
- G Fayet
- Laboratoire de Biochimie Médicale et U 38 INSERM, Faculté de Médecine, Marseille, France
| | | | | | | |
Collapse
|
8
|
Desruisseau S, Alquier C, Depetris D, Gruffat D, Chabaud O. Hormonal regulation of some steps of thyroglobulin synthesis and secretion in bicameral cell culture. J Cell Physiol 1994; 160:336-44. [PMID: 8040191 DOI: 10.1002/jcp.1041600215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Porcine thyroid cells were cultured for 15 days on porous bottom chambers with or without different mixtures of hormones added to serum-free basal medium. Assays with 10% serum were also performed for comparison with previously published results. The effects of the hormones, particularly insulin, TSH and hydrocortisone, were studied on total RNA content, thyroglobulin mRNA level, the amount of thyroglobulin secreted into the apical medium and on glycosylation. Insulin and TSH similarly increased the total RNA content, and their effects were additive. Thyroglobulin mRNA content was increased twofold by insulin and threefold by TSH. When they were added simultaneously, the maximal level of thyroglobulin mRNA was reached, showing that TSH and insulin effects on thyroglobulin gene expression were additive. Hydrocortisone alone did not modify total RNA or thyroglobulin mRNA content but the hormone amplified total RNA when insulin and TSH were present together. The basal level of thyroglobulin secreted into the apical medium was increased threefold by insulin and fourfold by TSH. The effects of these two hormones added together appeared to be additive. Hydrocortisone had no effect alone or even when combined with insulin or TSH. However, when the three hormones were added together, the hormonal response was amplified. TSH effect and insulin effect on the incorporation of 3H-mannose into thyroglobulin as well as on the anionic residue content of the molecule were additive.
Collapse
Affiliation(s)
- S Desruisseau
- INSERM U 270, Faculté de Médecine Nord, Marseille, France
| | | | | | | | | |
Collapse
|
9
|
Pályi I, Péter I, Daubner D, Vincze B, Lõrincz I. Establishment, characterization and drug sensitivity of a new anaplastic thyroid carcinoma cell line (BHT-101). VIRCHOWS ARCHIV. B, CELL PATHOLOGY INCLUDING MOLECULAR PATHOLOGY 1993; 63:263-9. [PMID: 8099464 DOI: 10.1007/bf02899271] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A thyroid carcinoma cell line, BHT-101, has been established in vitro from a metastatic lymph node deposit in a female patient with a non-hormone producing anaplastic, partly thyroglobulin- and thyroxine (T4)-positive papillary thyroid cancer. The cell population is heterogeneous, containing epithelial-like and fibroblast-like cells, and has a doubling time of 24 h. The cell line is polyploid with hypertetraploid predominance and the karyotype showed trisomies, tetrasomies, pentasomies as well as many marker chromosomes. The majority of the cells are negative or weakly positive for thyroglobulin and thyroxine and estrogen and progesterone receptors are present in the cells. BHT-101 cells produce tumours when injected into immunosuppressed CBA/Ca mice. The cells are sensitive to adriamycin, methotrexate and tamoxifen but not to methimazole (Favistan). The epithelial-like clone 1 and the fibroblast-like clone 3, isolated from the parental line, differed in drug sensitivity. This new cell line is suitable for studying the biology of thyroid carcinoma and for parallel in vivo and in vitro studies of drug activity against thyroid cancer.
Collapse
Affiliation(s)
- I Pályi
- Department of Cell Biology, National Institute of Oncology, Budapest, Hungary
| | | | | | | | | |
Collapse
|
10
|
Skinner CA, Kelly D, Kao LR, Nayfeh SN, Popko B, Chae CB. Thyroid-specific and hormone-dependent expression of rat thyroglobulin promoter fused with bacterial chloramphenicol acetyltransferase gene in transgenic mice. Mol Cell Endocrinol 1992; 90:33-8. [PMID: 1301397 DOI: 10.1016/0303-7207(92)90098-q] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The minimal promoter of rat thyroglobulin (TG) gene (168 bp) was fused with bacterial chloramphenicol acetyltransferase (CAT) gene, and transgenic mice carrying the TGCAT gene were produced. The minimal promoter is sufficient for thyroid-specific and hormone-dependent expression of TGCAT in transgenic mice. Deletion of a region between -128 and -92 bp (TGII), which is not required for the expression of TGCAT in transient expression assays but whose sequence is most extensively conserved among different species, appears to decrease frequency of the expression of TGCAT in transgenic mice. However, the same deletion apparently has no significant effect on TG promoter activity in stably transformed rat FRTL-5 cells.
Collapse
Affiliation(s)
- C A Skinner
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill 27599-7260
| | | | | | | | | | | |
Collapse
|
11
|
Maenhaut C, Brabant G, Vassart G, Dumont J. In vitro and in vivo regulation of thyrotropin receptor mRNA levels in dog and human thyroid cells. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)50686-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
12
|
Breton MF, Haye B, Denef JF, Pavlovic-Hournac M. Changes in cAMP-dependent and Ca2(+)-phospholipid-dependent protein kinase activities in suspension cultures of porcine thyroid cells. Mol Cell Endocrinol 1990; 71:217-27. [PMID: 2170212 DOI: 10.1016/0303-7207(90)90027-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The morphological and functional characteristics and the activities of cyclic AMP- (PKA I and PKA II) and calcium and phospholipid-dependent (PKC) protein kinases were studied in 2-day-old suspension cultures of porcine thyroid cells and were compared with those in freshly dissociated cells and intact glands. Thyroid cell morphology changed during the 2-day culture in the absence of specific regulators. This is characterized by a loss of cellular polarity, exo- and endocytotic vesicles and membranes of the rough endoplasmic reticulum, and an increase in the number of lysosomes, pseudomyelinic structures, lipidic inclusions and free ribosomes. Functional changes are characterized by a progressive decrease in protein iodination and its sensitivity to TSH stimulation. The total PKA activity in the cytosols of these cultures was slightly greater than that of freshly prepared tissue, due to the selective and significant accumulation of PKA I in cultured cells. In the particulate fraction the PKA activity was unchanged. PKC is the major kinase activity in porcine thyroids, and remains so in cultured cells. The slight drop in its activity in cytosols was offset by a significant increase in the particulate fraction, suggesting an intracellular redistribution of this kinase in cultured cells. The PKC activity is also partly activated in both the cytosol and particulate fraction, which results in an increased basal activity. The changes in PKA and PKC activities greatly modified the PKC/PKA ratios in the cytosols and the particulate fractions of cultured cells. These modifications could be partly responsible for the changes in sensitivity of cultured cells to the agents which control their activity.
Collapse
Affiliation(s)
- M F Breton
- Unité de Recherche sur la Glande Thyroïde et la Régulation Hormonale, U 96 INSERM, Le Kremlin-Bicêtre, France
| | | | | | | |
Collapse
|
13
|
Eggo MC, Bachrach LK, Burrow GN. Interaction of TSH, insulin and insulin-like growth factors in regulating thyroid growth and function. Growth Factors 1990; 2:99-109. [PMID: 2160262 DOI: 10.3109/08977199009071497] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Primary cultures of sheep thyroid cells have been used to study regulation of thyroid growth and function by growth factors and TSH. Cells were plated at low density to minimize contributions from the endogenously produced insulin-like growth factors and their binding proteins and other proteins or hormones secreted by thyroid cells in culture. Growth of the cells was followed for 7-11 days in medium without serum. We found that TSH by itself was unable to stimulate thyroid growth. However, the ability of insulin and IGF-I to stimulate thyroid cell growth was markedly potentiated by TSH. Thyroid function was assayed by measurement of uptake of pertechnetate and organification of iodide and also by synthesis of thyroglobulin mRNA. TSH alone was unable to stimulate thyroid function appreciably. Insulin and IGF-I were ineffective by themselves at stimulating thyroid differentiated function, but in the presence of TSH, all indices were stimulated markedly. We conclude that TSH by itself is not a growth factor for thyroid cells. However, in the presence of insulin or IGF-I, TSH potentiates the growth-stimulating properties of this hormone. Similarly, TSH by itself does not stimulate thyroid function but requires the presence of insulin or IGF-I. These data show the cooperative interactions between growth factors and TSH in regulating both thyroid growth and function.
Collapse
Affiliation(s)
- M C Eggo
- Department of Medicine, University of California, San Diego, La Jolla 92093-0613
| | | | | |
Collapse
|
14
|
Christophe D, Gérard C, Juvenal G, Bacolla A, Teugels E, Ledent C, Christophe-Hobertus C, Dumont JE, Vassart G. Identification of a cAMP-responsive region in thyroglobulin gene promoter. Mol Cell Endocrinol 1989; 64:5-18. [PMID: 2547676 DOI: 10.1016/0303-7207(89)90060-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The DNA sequences involved in transcription control by a cAMP-dependent mechanism have been localized in the thyroglobulin gene promoter region by a functional assay. The proximal 5'-flanking sequences from the bovine thyroglobulin gene were linked to the bacterial chloramphenicol acetyl-transferase gene. Transient expression of this reporter gene was studied in dog thyrocytes in primary culture in the presence, or absence, of cAMP stimulation. Deletion analysis showed that the cAMP-responsive region is contained within the first 250 base-pairs of the promoter, and suggests that it could correspond to a sequence conserved between species. These DNA sequences do not bear significant homology with cAMP-responsive elements (CRE) described previously. By contrast, some similarities were found with the fat-specific element (FSE2) of genes under cAMP control in adipocytes and with DNA elements mediating cAMP-dependent regulation of expression of two different genes in the lower eukaryote Dictyostelium discoideum. This suggests that control of Tg gene transcription by cAMP could involve a mechanism different from the one mediated by a classical CRE.
Collapse
Affiliation(s)
- D Christophe
- I.R.I.B.H.N., Université Libre de Bruxelles, Campus Erasme, Belgium
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Malthièry Y, Marriq C, Bergé-Lefranc JL, Franc JL, Henry M, Lejeune PJ, Ruf J, Lissitzky S. Thyroglobulin structure and function: recent advances. Biochimie 1989; 71:195-209. [PMID: 2495820 DOI: 10.1016/0300-9084(89)90057-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Thyroglobulin is a large-size iodoglycoprotein specific to thyroid tissue and is the substrate for the synthesis of thyroid hormones, thyroxine and 3,5,3'-triiodothyronine. Recent studies, which greatly benefited from recombinant DNA methodologies, improved the knowledge of several structural features of this dimeric protein and permitted insights into some structure-function relationships. Analysis-function of the primary structure of the human thyroglobulin monomer revealed several main characteristics: 1) 3 types of internal homologies; 2) extensive homology with the bovine thyroglobulin monomer and known partial sequences in the thyroglobulins of other mammalian species; 3) significant homologies with 2 other non-thyroid proteins (acetylcholinesterase and the invariant chain of the Ia class II histocompatibility antigen); 4) a terminal localization of the hormonogenic sites at both ends of the monomer. Current studies aim at determining conformational characteristics, understanding the molecular mechanisms of thyroid hormone formation and unraveling those interactions which in the thyroid cell and the thyroid follicle will permit this large pro-hormone to synthesize and release a few small thyroid hormone molecules. A more precise knowledge of this molecule in higher vertebrates and during evolution would impart valuable information concerning thyroid pathology, since thyroglobulin has been implicated in some genetic and in autoimmune thyroid diseases.
Collapse
Affiliation(s)
- Y Malthièry
- Laboratoire de Biochimie Médicale, INSERM U38, CNRS UA178, Faculté de Médecine, Marseille, France
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Pratt MA, Eggo MC, Bachrach LK, Carayon P, Burrow GN. Regulation of thyroperoxidase, thyroglobulin and iodide levels in sheep thyroid cells by TSH, tumor promoters and epidermal growth factor. Biochimie 1989; 71:227-35. [PMID: 2495823 DOI: 10.1016/0300-9084(89)90060-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Using sheep thyroid cells in culture, we have studied the effects of thyroid stimulating hormone (TSH), epidermal growth factor (EGF) and the tumor promoter, 12-O-tetradecanoylphorbol-13-acetate (TPA) on the activity and expression of both thyroglobulin (Tg) and thyroid peroxidase (TPO) and on the ability of cells to trap and organify iodide. Using Western blotting techniques, we found that TSH increased the absolute cellular levels of Tg. The optimum TSH concentration for Tg mRNA production was between 0.1-1.0 mU/ml. Thyroglobulin mRNA levels were stimulated by TSH but detectable levels were also present in cultures grown in its absence containing cortisol, insulin, transferrin, somatostatin and glycyl-lysyl-histidyl acetate. Unlike Tg, TPO protein levels were found to be completely dependent upon TSH. A time course of TSH stimulation of TPO mRNA showed increases after 8 h of TSH stimulation, whereas induction of Tg mRNA by TSH was seen at 24 h. Iodide trapping and organification were also TSH-dependent processes, showing maximum activities at 300-500 muU/ml of TSH. The addition of 10 nM TPA caused a biphasic decrease in radiolabeled pertechnetate uptake, with complete inhibition being seen at 14 h. Inhibition of iodide organification occurred more rapidly. TPA and EGF (1 nM) reduced the amount of newly synthesized Tg in TSH-stimulated cells by 50% but the absolute amount of Tg within the cells was not markedly inhibited at these early times.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- M A Pratt
- C.H. Best Institute, Toronto, Ontario, Canada
| | | | | | | | | |
Collapse
|
17
|
Gérard CM, Roger PP, Dumont JE. Thyroglobulin gene expression as a differentiation marker in primary cultures of calf thyroid cells. Mol Cell Endocrinol 1989; 61:23-35. [PMID: 2663567 DOI: 10.1016/0303-7207(89)90186-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A system of calf thyroid follicular cells in primary cultures has been developed to investigate the control of thyroglobulin gene expression in normal cells in vitro. In low (0.1%) serum conditions, the cells remained quiescent and formed dense aggregates surrounded by slowly spreading cells. High expression of thyroid-specific differentiation markers such as thyroglobulin (Tg) mRNA accumulation and iodide transport required the continuous exposure of cells to thyrotropin (TSH) or other adenylate cyclase activators (cholera toxin and forskolin). In the absence of TSH, Tg mRNA decreased to low but still detectable levels. Addition of TSH, forskolin or cholera toxin restored high Tg gene expression. Hydrocortisone moderately stimulated basal Tg mRNA accumulation and strongly potentiated the effect of TSH. Growth promoters including serum (1-10%), epidermal growth factor (EGF), fibroblast growth factor (FGF) and 12-O-tetradecanoylphorbol 13-acetate (TPA) induced calf thyroid cells to develop as a monolayer and inhibited both basal and TSH-stimulated expression of specialized functions. Moreover, only a partial restoration of this expression was achieved after addition of TSH or forskolin to well spread-out cells that had proliferated in response to EGF or serum. The results show that in calf thyroid cells, iodide transport and Tg gene expression are regulated by TSH through cyclic AMP; hydrocortisone potentiates this effect on Tg gene expression, while all growth promoting factors inhibit the expression of these differentiated functions.
Collapse
Affiliation(s)
- C M Gérard
- Institute of Interdisciplinary Research, Free University of Brussels, School of Medicine, Belgium
| | | | | |
Collapse
|
18
|
Kasai K, Ohmori T, Koizumi N, Hosoya T, Hiraiwa M, Emoto T, Hattori Y, Shimoda S. Regulation of thyroid peroxidase activity by thyrotropin, epidermal growth factor and phorbol ester in porcine thyroid follicles cultured in suspension. Life Sci 1989; 45:1451-9. [PMID: 2811602 DOI: 10.1016/0024-3205(89)90035-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The activity of thyroid peroxidase (TPO) in porcine follicles cultured for 96 h in suspension with five hormones (5H) still attained over 50% of that in the freshly isolated follicles. On the other hand, the activity in those cultured with 5H + TSH (6H) was several times higher than that cultured with 5H after 96 h, although an initial decrease of TPO activity during the first 24 h of culture was observed in both conditions. The ability of follicles to metabolize iodide (uptake and organification) when cultured with 6H for 96 h was also several times higher than that of those cultured with 5H. The half-maximal dose of TSH for stimulation of TPO activity and iodide metabolism was 0.03-0.04 mU/ml and the effect was mediated by cAMP. These results indicate that in porcine thyroid follicles in primary suspension culture, TPO activity as well as the ability of iodide metabolism is induced by chronic TSH stimulation. In addition, epidermal growth factor (EGF, 10(-9)M) and phorbol 12-myristate 13-acetate (PMA, 10(-8) M) completely inhibited TSH stimulation on both activities and also basal (5H) activity of iodide metabolism.
Collapse
Affiliation(s)
- K Kasai
- Department of Endocrinology, Dokkyo University School of Medicine, Tochigi, Japan
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Gerard CM, Lefort A, Libert F, Christophe D, Dumont JE, Vassart G. Transcriptional regulation of the thyroperoxydase gene by thyrotropin and forskolin. Mol Cell Endocrinol 1988; 60:239-42. [PMID: 2850960 DOI: 10.1016/0303-7207(88)90184-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The expression of the gene coding for thyroperoxydase, the main enzyme involved in the synthesis of the thyroid hormones, is controlled by thyroid stimulating hormone. In vitro transcription assays performed on nuclei isolated from dog thyroid cells in primary culture showed that this control is at the transcription level, takes place rapidly (1 h) and is cyclic AMP-dependent as it is mimicked by forskolin. Insulin does not seem to be an important modulator of the thyroperoxydase gene expression.
Collapse
Affiliation(s)
- C M Gerard
- Institute of Interdisciplinary Research, School of Medicine, Free University of Brussels, Belgium
| | | | | | | | | | | |
Collapse
|