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Machado-Carvalho L, Martín M, Torres R, Gabasa M, Alobid I, Mullol J, Pujols L, Roca-Ferrer J, Picado C. Low E-prostanoid 2 receptor levels and deficient induction of the IL-1β/IL-1 type I receptor/COX-2 pathway: Vicious circle in patients with aspirin-exacerbated respiratory disease. J Allergy Clin Immunol 2015; 137:99-107.e7. [PMID: 26560040 DOI: 10.1016/j.jaci.2015.09.028] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 09/01/2015] [Accepted: 09/23/2015] [Indexed: 01/15/2023]
Abstract
BACKGROUND We hypothesized that the 2 reported alterations in aspirin-exacerbated respiratory disease (AERD), reduced expression/production of COX-2/prostaglandin (PG) E2 and diminished expression of E-prostanoid (EP) 2 receptor, are closely linked. OBJECTIVE We sought to determine the mechanisms involved in the altered regulation of the COX pathway in patients with AERD. METHODS Fibroblasts were obtained from nasal mucosa; samples of control subjects (NM-C, n = 8) and from nasal polyps from patients with aspirin-exacerbated respiratory disease (NP-AERD, n = 8). Expression of the autocrine loop components regulating PGE2 production and signaling, namely IL-1 type I receptor (IL-1RI), COX-2, microsomal prostaglandin E synthase 1 (mPGES-1), and EP receptors, was assessed at baseline and after stimulation with IL-1β, PGE2, and specific EP receptor agonists. RESULTS Compared with NM-C fibroblasts, basal expression levels of IL-1RI and EP2 receptor were lower in NP-AERD fibroblasts. IL-1β-induced IL-1RI, COX-2, and mPGES-1 expression levels were also lower in these cells. Levels of IL-1RI positively correlated with COX-2 and mPGES-1 expression in both NM-C and NP-AERD fibroblasts. Incubation with either exogenous PGE2 or selective EP2 agonist significantly increased expression of IL-1RI in NM-C fibroblasts and had hardly any effect on NP-AERD fibroblasts. Alterations in IL-1RI, COX-2, and mPGES-1 expression that were found in NP-AERD fibroblasts were corrected when EP2 receptor expression was normalized by transfection of NP-AERD fibroblasts. CONCLUSION Altered expression of EP2 in patients with AERD contributes to deficient induction of IL-1RI, reducing the capacity of IL-1β to increase COX-2 and mPGES-1 expression, which results in low PGE2 production. This impairment in the generation of PGE2 subsequently reduces its ability to induce IL-1RI.
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Affiliation(s)
- Liliana Machado-Carvalho
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain.
| | - Margarita Martín
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Biochemistry Unit, School of Medicine, Universitat de Barcelona, Barcelona, Spain
| | - Rosa Torres
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain; Department of Pharmacology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Marta Gabasa
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
| | - Isam Alobid
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain; Rhinology Unit & Smell Clinic, ENT Department, Hospital Clínic, Barcelona, Spain
| | - Joaquim Mullol
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain; Rhinology Unit & Smell Clinic, ENT Department, Hospital Clínic, Barcelona, Spain
| | - Laura Pujols
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
| | - Jordi Roca-Ferrer
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
| | - Cesar Picado
- Clinical and Experimental Respiratory Immunoallergy, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain; Pneumology and Respiratory Allergy Department, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
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Ito A, Takii T, Matsumura T, Onozaki K. Augmentation of Type I IL-1 Receptor Expression and IL-1 Signaling by IL-6 and Glucocorticoid in Murine Hepatocytes. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.7.4260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
IL-1 signal is transduced through type I receptor (IL-1RI). We have recently reported that LPS augments IL-1RI mRNA expression in the hepatocytes of mice in vivo, and the augmentation is mediated by the interaction of IL-1, IL-6, and glucocorticoid (GC). In this study, we examined whether IL-1RI mRNA expression level in the hepatocytes reflects those of cell surface molecule and IL-1 signaling. When primary cultured murine hepatocytes were treated with dexamethasone (Dex) or IL-6, these two reagents synergistically up-regulated IL-1RI mRNA expression in the cells. 125I-labeled IL-1 binding experiment showed that the level of binding was also up-regulated by the treatment with Dex and IL-6. Scatchard analysis revealed that the number of IL-1R increased. The increased binding of IL-1 was completely inhibited by an Ab against murine IL-1RI, indicating that Dex and IL-6 augmented the expression of cell surface IL-1RI molecule. When hepatocytes were pretreated with Dex and IL-6, the activation of IL-1R-associated kinase was augmented in response to IL-1, indicating that IL-1 signaling was also augmented. In addition, IL-1 treatment following administration of the combination of Dex and IL-6 into mice markedly increased the serum level of serum amyloid A. These results indicate that GC and IL-6 augment the expression of cell surface IL-1RI in hepatocytes, as well as IL-1 signaling and IL-1R-associated kinase activation, through up-regulation of IL-1RI mRNA level, which represents a novel regulatory network between IL-1, GC, and IL-6.
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Affiliation(s)
- Atsushi Ito
- Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Takemasa Takii
- Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Takayuki Matsumura
- Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Kikuo Onozaki
- Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
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3
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Di Battista J, Doré S, Morin N, He Y, Pelletier JP, Martel-Pelletier J. Prostaglandin E2 stimulates insulin-like growth factor binding protein-4 expression and synthesis in cultured human articular chondrocytes: Possible mediation by Ca++ -calmodulin regulated processes. J Cell Biochem 1997. [DOI: 10.1002/(sici)1097-4644(19970601)65:3<408::aid-jcb10>3.0.co;2-b] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Ito A, Takii T, Soji T, Onozaki K. Endotoxin-induced upregulation of type I interleukin-1 receptor mRNA expression in hepatocytes of mice: role of cytokines. J Interferon Cytokine Res 1997; 17:55-61. [PMID: 9041472 DOI: 10.1089/jir.1997.17.55] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Interleukin-1 (IL-1) signal is transduced through the type I IL-1 receptor (IL-1RI). Although regulation of IL-1R expression has been extensively studied in vitro, little is known about it in vivo. By using RT-PCR analysis, we investigated the regulation of the IL-1RI mRNA expression level in various organs of mice at 2, 6, and 24 h following lipopolysaccharide (LPS) administration. IL-1RI mRNA expression in response to LPS appeared to be different in various organs. As a marked and sustained increase of IL-1RI mRNA expression in the liver was observed, we investigated the mechanism of the upregulation. IL-1, IL-6, and tumor necrosis factor (TNF) all increased the mRNA expression in the liver when administrated in vivo. In situ hybridization revealed that upregulation of IL-1R mRNA was observed in parenchymal liver cells (hepatocytes) in response to LPS administration. When primary cultured hepatocytes were treated in vitro, IL-1, IL-6, conditioned medium from LPS-treated mouse macrophages, and serum from LPS-treated mouse upregulated IL-1RI mRNA expression, but LPS, TNF, and prostaglandin E2 failed to do so. Therefore, these results suggest that the upregulation of IL-1RI mRNA in the hepatocytes by LPS administration is mediated by cytokines, especially by IL-1 and IL-6. The results also indicate that the regulation is different in different organs, and microenvironmental factors may be important.
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Affiliation(s)
- A Ito
- Department of Hygienic Chemistry, Faculty of Pharmaceutical Sciences, Nagoya City University, Japan
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5
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DiBattista J, Doré S, Morin N, Abribat T. Prostaglandin E2 up-regulates insulin-like growth factor binding protein-3 expression and synthesis in human articular chondrocytes by a c-AMP-independent pathway: Role of calcium and protein kinase A and C. J Cell Biochem 1996. [DOI: 10.1002/(sici)1097-4644(19961201)63:3<320::aid-jcb7>3.0.co;2-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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6
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DiBattista JA, Doré S, Morin N, Abribat T. Prostaglandin E2 up-regulates insulin-like growth factor binding protein-3 expression and synthesis in human articular chondrocytes by a c-AMP-independent pathway: role of calcium and protein kinase A and C. J Cell Biochem 1996; 63:320-33. [PMID: 8913883 DOI: 10.1002/(sici)1097-4644(19961201)63:3%3c320::aid-jcb7%3e3.0.co;2-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Insulin-like growth factor-1, IGF-1, is believed to be an important anabolic modulator of cartilage metabolism and its bioactivity and bioavailability is regulated, in part, by IGF-1 binding protein 3 (IGFBP-3). Prostaglandin E2 (PGE2) stimulates IGF-1 production by articular chondrocytes and we determined whether the eicosanoid could regulate IGFBP-3 and, as such, act as a modifier of IGF-1 action at a different level. Using human articular chondrocytes in high density primary culture, Western and Western ligand blotting to measure secreted IGFBP-3 protein, and Northern analysis to monitor IGFBP-3 mRNA levels, we demonstrated that PGE2 provoked a 3.9 +/- 1.1 (n = 3) fold increase in IGFBP-3 mRNA and protein. This effect was reversed by the Ca++ channel blockers, verapamil and nifedipine, and the Ca++/calmodulin inhibitor, W-7. The Ca+2 ionophore, ionomycin, mimicked the effects of PGE2 as did the phorbol ester PMA, which activates Ca++/-phospholipid-dependent protein kinase C (PKC). Cyclic AMP mimetics, such as forskolin, IBMX, Ro-20-1724, and Sp-cAMP, inhibited the expression and synthesis of the binding protein. PGE2 did not increase the levels of cAMP or protein kinase A (PKA) activity in chondrocytes. The PGE2 secretagogue, IL-1 beta, down-regulated control levels of IGFBP-3 which could be completely abrogated by pre-incubation with the tyrosine kinase inhibitor, erbstatin, and partially reversed (50 +/- 8%) by KT-5720, a PKA inhibitor. These observations suggested that PGE2 does not mediate the effect of its secretagogue and that IL-1 beta signalling in chondrocytes may involve multiple kinases of diverse substrate specificities. Dexamethasone down-regulated control, constitutive levels of IGFBP-3 mRNA and protein eliminating the previously demonstrated possibility of cross-talk between glucocorticoid receptor (GR) and PGE2 receptor signalling pathways. Taken together, our results suggest that PGE2 modulates IGFBP-3 expression, protein synthesis, and secretion, and that such regulation may modify human chondrocyte responsiveness to IGF-1 and influence cartilage metabolism.
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Affiliation(s)
- J A DiBattista
- Department of Medicine, University of Montereal, Quebec, Canada
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Amara FM, Sun J, Wright JA. Defining a novel cis-element in the 3'-untranslated region of mammalian ribonucleotide reductase component R2 mRNA. cis-trans-interactions and message stability. J Biol Chem 1996; 271:20126-31. [PMID: 8702735 DOI: 10.1074/jbc.271.33.20126] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Mammalian ribonucleotide reductase is a highly regulated activity essential for DNA synthesis and repair. The 3'-untranslated region (3'-UTR) of mammalian ribonucleotide reductase R2 mRNA has been implicated in the tumor promoter, 12-O-tetradecanoylphorbol-13-acetate-mediated stabilization of mouse BALB/c 3T3 R2 message. We investigated the possibility that the 3'-UTR contains regulatory information for R2 mRNA turnover. Using 3'-end-labeled RNA in gel shift and UV cross-linking analyses, we detected in the 3'-UTR a novel 9-nucleotide cis-element, 5'-UCGUGUGCU-3', which interacted with a widely distributed cellular cytosolic protease-sensitive factor(s) in a sequence-specific manner to form a 45-kDa R2 binding protein complex. The binding activity was redox-sensitive and down-regulated by 12-O-tetradecanoylphorbol-13-acetate and okadaic acid in a dose-dependent manner. Insertion of a 154-base pair fragment containing the cis-element led to markedly reduced accumulation of chloramphenicol acetyltransferase hybrid mRNA relative to the same insert carrying a series of G --> A mutations within this element that eliminated binding. We suggest that the 9-nucleotide region functions as a destabilizing element. These results provide a model for ribonucleotide reductase gene expression through a novel and specific mRNA cis-trans-interaction involving a phosphorylation signal pathway that leads to changes in the stability of R2 message.
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Affiliation(s)
- F M Amara
- Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
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8
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Pringle AK, Gardner CR, Walker RJ. Reduction of cerebellar GABAA responses by interleukin-1 (IL-1) through an indomethacin insensitive mechanism. Neuropharmacology 1996; 35:147-52. [PMID: 8734482 DOI: 10.1016/0028-3908(95)00161-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Recently, a role of IL-1 in the central nervous system has been described, principally a fever-inducing effect in the hypothalamus through a prostaglandin second messenger system. IL-1 has also been shown to potentiate gamma-aminobutyric acid (GABAA) responses in embryonic chick neurones. This study describes the investigation of the effect of IL-1 on GABAA responses within the in vitro rat cerebellar slice, a preparation containing intact neuronal circuitry. Stimulation of the area of passage of paralleled fibres produced a pure GABAA inhibition of the spontaneous firing of Purkinje cells. 5 and 10 ng/ml IL-1 produced a reduction in the duration of inhibition 10 min after beginning perfusion of IL-1. This effect reversed within 15 min of washing out the IL-1. 10 ng/ml IL-1 also reduced the effects of exogenously-applied GABA (0.1 mM) with the same time course. In the presence of 1 uM indomethacin, there was no change in the effect of the IL-1. It can therefore be concluded that the reduction in cerebellar GABAA responses by IL-1 is not mediated by the indomethacin-sensitive prostaglandin second messenger system.
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Affiliation(s)
- A K Pringle
- Department of Physiology and Pharmacology, University of Southhampton, U.K
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9
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Chen X, Nishimura J, Hasna J, Kobayashi S, Shikasho T, Kanaide H. Protein kinase C and protein kinase A regulate the expression of angiotensin II receptor mRNA in smooth muscle cells. Eur J Pharmacol 1994; 267:175-83. [PMID: 7519561 DOI: 10.1016/0922-4106(94)90169-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Using reverse transcription polymerase chain reaction and fura-2 microfluorometry of intracellular Ca2+ concentrations, we investigated the effects of angiotensin II and cyclic AMP on the expression of angiotensin II type 1 receptor mRNA and the relationship between angiotensin II receptor mRNA level and physiological responsiveness in rat aortic smooth muscle cells in primary culture. Angiotensin II (1 microM) induced a time- and dose-dependent transient decrease in the level of angiotensin II receptor mRNA. The maximal decrease (50 +/- 13% of control) occurred at 6 h, followed by a gradual return to the control level within 24 h. H-7 (30 microM), a relatively specific protein kinase C inhibitor, inhibited decrease in the expression of angiotensin II receptor mRNA induced by 6 h angiotensin II treatment, while 6 h stimulation by 0.3 microM phorbol 12-myristate 13-acetate also induced a decrease (35 +/- 8% of control) in the expression of angiotensin II receptor mRNA. An increase in cellular cyclic AMP induced by 10 microM forskolin plus 10 microM 3-isobutyl-1-methyl-xanthine, decreased the angiotensin II receptor mRNA level to 50 +/- 13% of the control at 6 h and increased it to 219 +/- 39% of the control at 48 h of treatment. Angiotensin II-induced decrease and cyclic AMP-induced increase in the expression of angiotensin II receptor mRNA were accompanied by a reduction and enhancement in [Ca2+]i transients induced by angiotensin II, respectively. In contrast with angiotensin II receptor mRNA level (102 +/- 8% of control), the [Ca2+]i transients were markedly decreased in angiotensin II plus H-7 treated cells.(ABSTRACT TRUNCATED AT 250 WORDS)
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MESH Headings
- 1-Methyl-3-isobutylxanthine/pharmacology
- Angiotensin II/metabolism
- Animals
- Base Sequence
- Blotting, Northern
- Cells, Cultured
- Colforsin/pharmacology
- Cyclic AMP/pharmacology
- Cyclic AMP-Dependent Protein Kinases/physiology
- Down-Regulation/drug effects
- Fura-2
- Male
- Molecular Sequence Data
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/metabolism
- Polymerase Chain Reaction
- Protein Kinase C/physiology
- RNA, Messenger/biosynthesis
- Rats
- Rats, Wistar
- Receptors, Angiotensin/biosynthesis
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Affiliation(s)
- X Chen
- Division of Molecular Cardiology, Faculty of Medicine, Kyushu University, Higashi-ku, Japan
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Kawaguchi Y, Harigai M, Hara M, Suzuki K, Kawakami M, Ishizuka T, Hidaka T, Kitani A, Kawagoe M, Nakamura H. Increased interleukin 1 receptor, type I, at messenger RNA and protein level in skin fibroblasts from patients with systemic sclerosis. Biochem Biophys Res Commun 1992; 184:1504-10. [PMID: 1375465 DOI: 10.1016/s0006-291x(05)80053-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Summary. To elucidate the mechanisms of the fibrosis in systemic sclerosis (SSc) through the action of a cytokine, interleukin 1 (IL-1), we studied the specific biologic and biochemical features of interleukin 1 receptor (IL-1R) as expressed on the surfaces of fibroblast cells in cultures from 3 SSc patients and 3 normal donors. 125I-IL-1 beta binding assays revealed a high density of IL-1R on the cell surfaces of SSc fibroblasts as compared to those of normal subjects. We also found an enhanced expression of IL-1R messenger RNA (mRNA) in SSc fibroblasts, using Northern blot or slot blot analysis. These findings indicate that the expression of IL-1R on SSc fibroblasts were spontaneously induced at the transcriptional level. It is suggested that SSc fibroblasts are more sensitive to IL-1, and that the signal transduction of IL-1 through IL-1R may be eventually involved in the fibrosis of SSc.
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Affiliation(s)
- Y Kawaguchi
- First Department of Internal Medicine, National Defense Medical College, Saitama, Japan
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11
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Takii T, Akahoshi T, Kato K, Hayashi H, Marunouchi T, Onozaki K. Interleukin-1 up-regulates transcription of its own receptor in a human fibroblast cell line TIG-1: role of endogenous PGE2 and cAMP. Eur J Immunol 1992; 22:1221-7. [PMID: 1315688 DOI: 10.1002/eji.1830220517] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The regulation of interleukin-1 receptor (IL-1R) mRNA expression by IL-1 in a human lung fibroblast cell line (TIG-1) was investigated. After 2 h of stimulation with human recombinant IL-1 alpha or IL-1 beta, the levels of T cell/fibroblast-type IL-1R mRNA increased, and the elevation was sustained for at least 72 h. IL-1 also stimulated synthesis of prostaglandin E2 (PGE2) and secondary cAMP accumulation. Exogenously added PGE2 increased the levels of both IL-1R mRNA and intracellular cAMP. Forskolin, cholera toxin and 8-Bromo adenosine (8-Br-cAMP) all increased IL-1R mRNA levels. Indomethacin blocked IL-1 stimulation of IL-1R mRNA expression, PGE2 production and cAMP. 125I-labeled IL-1 alpha-binding studies showed that this cell line expresses 2.6 x 10(4) IL-1R per cell with a Kd of 5.1 x 10(-10) M. After treatment of the cells with IL-1, the level of IL-1R increased over that of control cells. PGE2 also increased IL-1R without alteration in its affinity. Cross-linking experiments indicate that this cell line expresses the 80-kDa receptor molecule before and after treatment with PGE2; the molecular mass corresponds to the T cell/fibroblast type I IL-1R. These results indicate that IL-1 does not directly stimulate expression of IL-1R mRNA or cell surface IL-1R, but only indirectly by stimulation of endogenous PGE2.
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Affiliation(s)
- T Takii
- Division of Cell Biology, Fujita-Gakuen Health University, Aichi, Japan
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Kobayashi H, Fukata J, Tominaga T, Murakami N, Fukushima M, Ebisui O, Segawa H, Nakai Y, Imura H. Regulation of interleukin-1 receptors on AtT-20 mouse pituitary tumour cells. FEBS Lett 1992; 298:100-4. [PMID: 1312014 DOI: 10.1016/0014-5793(92)80031-b] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
To study the cellular mechanisms of interleukin-1 (IL-1) in the pituitary corticotroph, we studied the properties of IL-1 receptors on a mouse pituitary ACTH-producing cell line, AtT-20. Scatchard plot analysis revealed a single type of receptor with a Kd (dissociation constant) of 93 pM, and 482 binding sites/cell. [125I]IL-1 alpha binding competed with IL-1 alpha and IL-1 beta in an equimolar fashion. A 24 h pre-incubation with either CRH, epinephrine or nor-epinephrine increased the [125I]IL-1 alpha binding sites in the AtT-20 cells and conversely, a similar pre-incubation with either dexamethasone or tumour necrosis factor-alpha (TNF alpha) decreased them without affecting the affinity of the receptors in either case.
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Affiliation(s)
- H Kobayashi
- Department of Internal Medicine, Kyoto University Faculty of Medicine, Japan
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