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Buishand FO, van Erp MG, Groenveld HA, Mol JA, Kik M, Robben JH, Kooistra HS, Kirpensteijn J. Expression of insulin-like growth factor-1 by canine insulinomas and their metastases. Vet J 2012; 191:334-40. [DOI: 10.1016/j.tvjl.2011.03.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 12/17/2010] [Accepted: 03/16/2011] [Indexed: 12/22/2022]
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2
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Li R, Pourpak A, Morris SW. Inhibition of the insulin-like growth factor-1 receptor (IGF1R) tyrosine kinase as a novel cancer therapy approach. J Med Chem 2010; 52:4981-5004. [PMID: 19610618 DOI: 10.1021/jm9002395] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Rongshi Li
- Drug Discovery, H. Lee Moffitt Cancer Center and Research Institute, Oncologic Sciences, University of South Florida, 12902 Magnolia Drive, Tampa, FL 33612, USA.
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Medina MC, Souza LC, Caperuto LC, Anhê GF, Amanso AM, Teixeira VPA, Bordin S, Carpinelli AR, Britto LRG, Barbieri RL, Borella MI, Carvalho CRO. Dehydroepiandrosterone increases β-cell mass and improves the glucose-induced insulin secretion by pancreatic islets from aged rats. FEBS Lett 2005; 580:285-90. [PMID: 16376341 DOI: 10.1016/j.febslet.2005.12.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Revised: 11/27/2005] [Accepted: 12/05/2005] [Indexed: 12/31/2022]
Abstract
The effect of dehydroepiandrosterone (DHEA) on pancreatic islet function of aged rats, an animal model with impaired glucose-induced insulin secretion, was investigated. The following parameters were examined: morphological analysis of endocrine pancreata by immunohistochemistry; protein levels of insulin receptor, IRS-1, IRS-2, PI 3-kinase, Akt-1, and Akt-2; and static insulin secretion in isolated pancreatic islets. Pancreatic islets from DHEA-treated rats showed an increased beta-cell mass accompanied by increased Akt-1 protein level but reduced IR, IRS-1, and IRS-2 protein levels and enhanced glucose-stimulated insulin secretion. The present results suggest that DHEA may be a promising drug to prevent diabetes during aging.
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Affiliation(s)
- Mayrin C Medina
- Department of Physiology and Biophysics, ICB, USP, São Paulo, SP, CEP05389-970, Brazil
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Miller BS, Yee D. Type I Insulin-like Growth Factor Receptor as a Therapeutic Target in Cancer: Figure 1. Cancer Res 2005; 65:10123-7. [PMID: 16287993 DOI: 10.1158/0008-5472.can-05-2752] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Data from experimental model systems and population studies have implicated type I insulin-like growth factor receptor (IGF1R) signaling in many different human cancers. Drugs to disrupt IGF1R function have been developed and are now entering clinical trial. This brief review will identify key areas to consider as these clinical trials move forward.
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Affiliation(s)
- Bradley S Miller
- Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Li M, Miyagawa JI, Moriwaki M, Yuan M, Yang Q, Kozawa J, Yamamoto K, Imagawa A, Iwahashi H, Tochino Y, Yamagata K, Matsuzawa Y. Analysis of expression profiles of islet-associated transcription and growth factors during beta-cell neogenesis from duct cells in partially duct-ligated mice. Pancreas 2003; 27:345-55. [PMID: 14576499 DOI: 10.1097/00006676-200311000-00013] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
INTRODUCTION Beta-cell neogenesis from pancreatic duct cells has been reported to occur in duct-ligated rat. Nevertheless, detailed process of this phenomenon has not been clarified. AIMS AND METHODOLOGY To clarify the mechanism of beta-cell neogenesis, a partial pancreatic duct ligation mouse model was created. Proliferation of duct cells, beta-cell neogenesis, and expression of transcription factors and differentiation/growth factors were studied by immunohistochemistry, cDNA array, and RT-PCR methods. RESULTS In the duct-ligated portion of the pancreas, newly formed islet-like cell clusters (ICCs) were observed arising from the ducts on day 7 and afterward. Transcription factors, such as pancreatic and duodenal homeobox gene-1 (PDX-1), paired box factor 6 (Pax6), islet1 and Nkx2.2-positive cells, and protein gene product 9.5 (PGP9.5) were also induced in duct lining cells. By cDNA microarray analysis, expression of insulin-like growth factor-1 (IGF-1) and transforming growth factor beta1 (TGF-beta1) were above control levels on day 5, and RT-PCR showed an increase from day 5 to day 28. IGF-1 and activin A-positive cells were detected in ducts. In addition, expression of betacellulin (BTC), heparin-binding epidermal growth factor-like growth factor (HB-EGF), and TGF-alpha were also increased from day 3 or 5. CONCLUSION These findings suggest that beta-cell or endocrine precursors are localized among duct lining cells. Induction of several islet cell-associated transcription factors and differentiation and/or growth factors may play important roles during beta-cell neogenesis in this model.
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Affiliation(s)
- Ming Li
- Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University, Suita, Japan
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Rakatzi I, Seipke G, Eckel J. [LysB3, GluB29] insulin: a novel insulin analog with enhanced β-cell protective action. Biochem Biophys Res Commun 2003; 310:852-9. [PMID: 14550282 DOI: 10.1016/j.bbrc.2003.09.090] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Insulin receptor substrate (IRS)-2 has been implicated in the promotion of beta-cell survival. Here we tested the hypothesis that the novel analog [LysB3, GluB29] insulin (insulin glulisine, IG) might mediate an enhanced beta-cell protective effect due to its unique property of preferential IRS-2 phosphorylation. We assessed IRS activation by IG and its anti-apoptotic activity against cytokines or palmitic acid in comparison to insulin, insulin analogs, and insulin-like growth factor (IGF)-I using INS-1 cells. IG induced a prominent IRS-2 activation without significant IRS-1 stimulation. The marked cytokine- and fatty acid-induced apoptosis was strongly (55-60%) inhibited by IG both at the level of caspase 3 activation and nucleosomal release, with only 15% inhibition of apoptosis by regular insulin. At 1nM, insulin, insulin aspart, and insulin lispro were much less effective compared to IG. In conclusion, the prominent anti-apoptotic activity of insulin glulisine might serve to counteract autoimmune- and lipotoxicity-induced beta-cell destruction.
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Affiliation(s)
- Irini Rakatzi
- Department of Clinical Biochemistry and Pathobiochemistry, German Diabetes Research Institute, Düsseldorf, Germany
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Strle K, Zhou JH, Broussard SR, Venters HD, Johnson RW, Freund GG, Dantzer R, Kelley KW. IL-10 promotes survival of microglia without activating Akt. J Neuroimmunol 2002; 122:9-19. [PMID: 11777539 DOI: 10.1016/s0165-5728(01)00444-1] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
IL-10 is an anti-inflammatory cytokine that has recently been shown to promote survival of neurons and glia. Here we establish that IL-10 induces phosphorylation of Stat3 on Tyr(705) and serves as a survival factor for N13 microglial cells. Recombinant IL-10 (10 ng/ml) decreases growth factor withdrawal-induced apoptosis by 50%, as assessed by TUNEL. In contrast to IL-10, IGF-I increases enzymatic activity of PI 3-kinase and causes phosphorylation on serine(473) of Akt but does not prevent microglial apoptosis. These data establish that IL-10 activates Stat3 and inhibits the mitochondrial pathway of cell death without activating the Akt cell survival pathway.
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Affiliation(s)
- Klemen Strle
- Laboratory of Immunophysiology, Department of Animal Sciences, University of Illinois, 207 ERML, 1201 W. Gregory Dr., Urbana, IL 61801, USA
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Elliott J, Scarpello JHB, Morgan NG. Effects of tyrosine kinase inhibitors on cell death induced by sodium fluoride and pertussis toxin in the pancreatic beta-cell line, RINm5F. Br J Pharmacol 2001; 132:119-26. [PMID: 11156568 PMCID: PMC1572541 DOI: 10.1038/sj.bjp.0703783] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
1. Sodium fluoride causes apoptosis of pancreatic beta-cells and this response is enhanced by pre-treatment with pertussis toxin. In the present study, tyrosine kinase inhibitors were used to investigate the mechanisms of action of NaF and pertussis toxin in the beta-cell line, RINm5F. 2. Exposure of RINm5F cells to low concentrations of genistein or tyrphostin A25 resulted in significant inhibition of cell death induced by 5 mM NaF. Higher concentrations (>25 microM) were cytotoxic in the absence of NaF but, paradoxically, the combination of genistein and NaF induced less cell death than when each agent was used alone. 3. The increase in cell death induced by 100 microM genistein was markedly inhibited by ciprofloxacin, a drug which binds to topoisomerase II. Etoposide (which inhibits topoisomerase II but has no effect on tyrosine kinase activity) also caused an increase in RINm5F cell death. Neither etoposide nor ciprofloxacin altered the response to 5 mM NaF. 4. Pertussis toxin markedly enhanced the extent of RINm5F cell death induced by NaF and this effect was completely prevented by 25 microM genistein. The inhibition caused by genistein was not affected by ciprofloxacin but was reproduced by a structurally dissimilar tyrosine kinase inhibitor, herbimycin A. 5. The results demonstrate that RINm5F beta-cells express a pertussis toxin sensitive pathway that is anti-apoptotic. The activity of this pathway is most evident in cells exposed to pro-apoptotic stimuli where the effects of pertussis toxin can be blocked by inhibitors of tyrosine kinase enzymes. A genistein-sensitive tyrosine kinase does not appear to be involved in RINm5F cell survival under basal conditions.
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Affiliation(s)
- Jim Elliott
- Cellular Pharmacology Group, School of Life Sciences, Keele University, Keele, Staffs ST5 5BG
| | - John H B Scarpello
- Cellular Pharmacology Group, School of Life Sciences, Keele University, Keele, Staffs ST5 5BG
| | - Noel G Morgan
- Cellular Pharmacology Group, School of Life Sciences, Keele University, Keele, Staffs ST5 5BG
- Author for correspondence:
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Burns CJ, Squires PE, Persaud SJ. Signaling through the p38 and p42/44 mitogen-activated families of protein kinases in pancreatic beta-cell proliferation. Biochem Biophys Res Commun 2000; 268:541-6. [PMID: 10679240 DOI: 10.1006/bbrc.2000.2179] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study has focused on the role of the 42- and 44-kDa mitogen-activated protein kinases (p42/44 MAPKs) and the 38-kDa mitogen-activated protein kinase (p38 MAPK) in the proliferation of the pancreatic beta-cell line MIN6. MIN6 beta-cell proliferation was assessed by measuring 5-bromo-2'-deoxyuridine (BrdU) incorporation into cellular DNA. Inhibition of both the p42/44 MAPK pathway using the MEK inhibitor PD098059 (PD) and the p38 MAPK pathway using the p38 inhibitor SB203580 (SB) caused a marked, concentration-dependent reduction in the BrdU immunostaining observed in the presence of 15% FCS when assessed using fluorescence immunocytochemistry. These data provide direct evidence of a role for p42/44 MAPKs in the mitogenic response of MIN6 beta-cells to FCS. Furthermore, these data also suggest a novel role for the p38 MAPK pathway in MIN6 beta-cell proliferation.
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Affiliation(s)
- C J Burns
- Endocrinology and Reproduction Research Group, Guy's, King's, & St. Thomas' School of Biomedical Sciences, Guy's Campus, London Bridge, London, SE1 9RT, United Kingdom.
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Gray SG, Yakovleva T, Hartmann W, Tally M, Bakalkin G, Ekström TJ. IGF-II enhances trichostatin A-induced TGFbeta1 and p21(Waf1,Cip1, sdi1) expression in Hep3B cells. Exp Cell Res 1999; 253:618-28. [PMID: 10585285 DOI: 10.1006/excr.1999.4661] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cell growth and division are controlled through the actions of cyclin-dependent kinases (CDKs) and cyclin dependent kinase inhibitors (CKIs). Treatment of cell lines with Trichostatin A leads to induction of one of these CKIs, p21, and growth arrest. Induction of p21 can also occur through the actions of TGFbeta1. Latent TGFbeta1 can be activated by the M6P/IGF2R. In the present study we have examined the effect of TSA on members of the IGF axis, the CKIs p21 and p27, and also TGFbeta1 in Hep3B cells. The only member of the IGF axis to be affected by treatments was IGF2. Expression of another gene from the same chromosomal location, H19, was also affected. TGFbeta1 expression was greatly enhanced by TSA. In addition, both CKIs, p21 and p27, were upregulated by TSA. Effects of adding IGF-II or TGFbeta1 to TSA-treated cells on p21 induction were examined. The results show that the induction of p21 by TSA can be modulated by additions of IGF-II whereas addition of TGFbeta1 affects its own expression but not p21. In conclusion, the results indicate that the induction of p21 and cell growth arrest caused by Trichostatin A may involve multiple signaling pathways.
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Affiliation(s)
- S G Gray
- Experimental Alcohol and Drug Addiction Research Section, Department of Clinical Neuroscience, Department of Clinical Neuroscience, Karolinska Institute, CMM, L8 01, Stockholm, S-171 76, Sweden
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Xu G, Kwon G, Marshall CA, Lin TA, Lawrence JC, McDaniel ML. Branched-chain amino acids are essential in the regulation of PHAS-I and p70 S6 kinase by pancreatic beta-cells. A possible role in protein translation and mitogenic signaling. J Biol Chem 1998; 273:28178-84. [PMID: 9774438 DOI: 10.1074/jbc.273.43.28178] [Citation(s) in RCA: 200] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Amino acids have been identified as important signaling molecules involved in pancreatic beta-cell proliferation, although the cellular mechanism responsible for this effect is not well defined. We previously reported that amino acids are required for glucose or exogenous insulin to stimulate phosphorylation of PHAS-I (phosphorylated heat- and acid-stable protein regulated by insulin), a recently discovered regulator of translation initiation during cell mitogenesis. Here we demonstrate that essential amino acids, in particular branched-chain amino acids (leucine, valine, and isoleucine), are largely responsible for mediating this effect. The transamination product of leucine, alpha-ketoisocaproic acid, also stimulates PHAS-I phosphorylation although the transamination products of isoleucine and valine are ineffective. Since amino acids are secretagogues for insulin secretion by beta-cells, we investigated whether endogenous insulin secreted by beta-cells is involved. Interestingly, branched-chain amino acids stimulate phosphorylation of PHAS-I independent of endogenous insulin secretion since genistein (10 microM) and herbimycin A (1 microM), two tyrosine kinase inhibitors in the insulin signaling pathway, exert no effect on amino acid-induced phosphorylation of PHAS-I. Furthermore, branched-chain amino acids retain their ability to induce phosphorylation of PHAS-I under conditions that block insulin secretion from beta-cells. In exploring the signaling pathway responsible for these effects, we find that rapamycin (25 nM) inhibits the ability of branched-chain amino acids to stimulate the phosphorylation of PHAS-I and p70(s6) kinase, suggesting that the mammalian target of rapamycin signaling pathway is involved. The branched-chain amino acid, leucine, also exerts similar effects on PHAS-I phosphorylation in isolated pancreatic islets. In addition, we find that amino acids are necessary for insulin-like growth factor (IGF-I) to stimulate the phosphorylation of PHAS-I indicating that a requirement for amino acids may be essential for other beta-cell growth factors in addition to insulin and IGF-I to activate this signaling pathway. We propose that amino acids, in particular branched-chain amino acids, may promote beta-cell proliferation either by stimulating phosphorylation of PHAS-I and p70(s6k) via the mammalian target of rapamycin pathway and/or by facilitating the proliferative effect mediated by growth factors such as insulin and IGF-I.
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Affiliation(s)
- G Xu
- Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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