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Rao SS, Kundapura SV, Dey D, Palaniappan C, Sekar K, Kulal A, Ramagopal UA. Cumulative phylogenetic, sequence and structural analysis of Insulin superfamily proteins provide unique structure-function insights. Mol Inform 2024:e202300160. [PMID: 38973776 DOI: 10.1002/minf.202300160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 01/17/2024] [Accepted: 03/14/2024] [Indexed: 07/09/2024]
Abstract
The insulin superfamily proteins (ISPs), in particular, insulin, IGFs and relaxin proteins are key modulators of animal physiology. They are known to have evolved from the same ancestral gene and have diverged into proteins with varied sequences and distinct functions, but maintain a similar structural architecture stabilized by highly conserved disulphide bridges. The recent surge of sequence data and the structures of these proteins prompted a need for a comprehensive analysis, which connects the evolution of these sequences (427 sequences) in the light of available functional and structural information including representative complex structures of ISPs with their cognate receptors. This study reveals (a) unusually high sequence conservation of IGFs (>90 % conservation in 184 sequences) and provides a possible structure-based rationale for such high sequence conservation; (b) provides an updated definition of the receptor-binding signature motif of the functionally diverse relaxin family members (c) provides a probable non-canonical C-peptide cleavage site in a few insulin sequences. The high conservation of IGFs appears to represent a classic case of resistance to sequence diversity exerted by physiologically important interactions with multiple partners. We also propose a probable mechanism for C-peptide cleavage in a few distinct insulin sequences and redefine the receptor-binding signature motif of the relaxin family. Lastly, we provide a basis for minimally modified insulin mutants with potential therapeutic application, inspired by concomitant changes observed in other insulin superfamily protein members supported by molecular dynamics simulation.
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Affiliation(s)
- Shrilakshmi Sheshagiri Rao
- Division of Biological Sciences, Poornaprajna Institute of Scientific Research, Poornaprajnapura, 562110, Bidalur (Post), Bengaluru, India
- Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Shankar V Kundapura
- Division of Biological Sciences, Poornaprajna Institute of Scientific Research, Poornaprajnapura, 562110, Bidalur (Post), Bengaluru, India
- Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Debayan Dey
- Division of Biological Sciences, Poornaprajna Institute of Scientific Research, Poornaprajnapura, 562110, Bidalur (Post), Bengaluru, India
- Present address: Department of Biochemistry, Emory University School of Medicine, GA 30322, Atlanta, USA
| | - Chandrasekaran Palaniappan
- Department of Computational and Data Sciences, Indian Institute of Science, 560012, Bangalore, India
- Molecular Biophysics Unit, Indian Institute of Science, 560012, Bangalore, India
| | - Kanagaraj Sekar
- Department of Computational and Data Sciences, Indian Institute of Science, 560012, Bangalore, India
| | - Ananda Kulal
- Division of Biological Sciences, Poornaprajna Institute of Scientific Research, Poornaprajnapura, 562110, Bidalur (Post), Bengaluru, India
| | - Udupi A Ramagopal
- Division of Biological Sciences, Poornaprajna Institute of Scientific Research, Poornaprajnapura, 562110, Bidalur (Post), Bengaluru, India
- Department of Microbiology and FST, School of Science, GITAM University, 530045, Visakhapatnam, India
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Yu L, Wei Y, Lu T, Li Z, Lai S, Yan Y, Chen C, Wen W. The SMYD3-dependent H3K4me3 status of IGF2 intensifies local Th2 differentiation in CRSwNP via positive feedback. Cell Commun Signal 2023; 21:345. [PMID: 38037054 PMCID: PMC10688075 DOI: 10.1186/s12964-023-01375-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 10/31/2023] [Indexed: 12/02/2023] Open
Abstract
Chronic rhinosinusitis with nasal polyps (CRSwNP) is a heterogeneous and common upper airway disease divided into various inflammatory endotypes. Recent epidemiological findings showed a T helper 2 (Th2)-skewed dominance in CRSwNP patients. Histone modification alterations can regulate transcriptional and translational expression, resulting in abnormal pathogenic changes and the occurrence of diseases. Trimethylation of histone H3 lysine 4 (H3K4me3) is considered an activator of gene expression through modulation of accessibility for transcription, which is closely related to CRSwNP. H3K4me3 levels in the human nasal epithelium may change under Th2-biased inflammatory conditions, resulting in exaggerated local nasal Th2 responses via the regulation of naïve CD4+ T-cell differentiation. Here, we revealed that the level of SET and MYND domain-containing protein 3 (SMYD3)-mediated H3K4me3 was increased in NPs from Th2 CRSwNP patients compared with those from healthy controls. We demonstrated that SMYD3-mediated H3K4me3 is increased in human nasal epithelial cells under Th2-biased inflammatory conditions via S-adenosyl-L-methionine (SAM) production and further found that the H3K4me3high status of insulin-like growth factor 2 (IGF2) produced in primary human nasal epithelial cells could promote naïve CD4+ T-cell differentiation into Th2 cells. Moreover, we found that SAM production was dependent on the c-Myc/methionine adenosyltransferase 2A (MAT2A) axis in the nasal epithelium. Understanding histone modifications in the nasal epithelium has immense potential utility in the development of novel classes of therapeutics targeting Th2 polarization in Th2 CRSwNP. Video Abstract.
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Affiliation(s)
- Lei Yu
- Department of Otolaryngology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, P.R. China
| | - Yi Wei
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
- Otorhinolaryngology Institute of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
- Guangzhou Key Laboratory of Otorhinolaryngology, Guangzhou, Guangdong, P.R. China
| | - Tong Lu
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Zhengqi Li
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Shimin Lai
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Yan Yan
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Changhui Chen
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
| | - Weiping Wen
- Department of Otolaryngology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, P.R. China.
- Department of Otolaryngology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China.
- Otorhinolaryngology Institute of Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China.
- Guangzhou Key Laboratory of Otorhinolaryngology, Guangzhou, Guangdong, P.R. China.
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Feng Y, Dimitrov DS. Antibody-based therapeutics against components of the IGF system. Oncoimmunology 2021; 1:1390-1391. [PMID: 23243603 PMCID: PMC3518512 DOI: 10.4161/onci.20925] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The insulin-like growth factor I (IGF-I) receptor (IGF-1R) is overexpressed in most human neoplasms tested so far. Many tumors in young patients produce high levels of the IGF-1R ligands, IGF-I and IGF-II. Given the complexity of the IGF signaling pathway, its complete inhibition may require combination therapies with antibodies targeting both IGF-1R and IGF-II.
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Affiliation(s)
- Yang Feng
- Protein Interactions Group; FNLCF; NIH; Frederick, MD USA
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Abstract
The insulin and insulin-like growth factor (IGF) family of proteins are part of a complex network that regulates cell proliferation and survival. While this system is undoubtedly important in prenatal development and postnatal cell growth, members of this family have been implicated in several different cancer types. Increased circulating insulin and IGF ligands have been linked to increased risk of cancer incidence. This observation has led to targeting the IGF system as a therapeutic strategy in a number of cancers. This chapter aims to describe the well-characterized biology of the IGF1R system, outline the rationale for targeting this system in cancer, summarize the clinical data as it stands, and discuss where we can go from here.
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Xiong X, Blakely A, Karra P, VandenBerg MA, Ghabash G, Whitby F, Zhang YW, Webber MJ, Holland WL, Hill CP, Chou DHC. Novel four-disulfide insulin analog with high aggregation stability and potency. Chem Sci 2019; 11:195-200. [PMID: 32110371 PMCID: PMC7012051 DOI: 10.1039/c9sc04555d] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 11/05/2019] [Indexed: 12/15/2022] Open
Abstract
A novel four-disulfide insulin analog was designed with retained bioactivity and increased fibrillation stability.
Although insulin was first purified and used therapeutically almost a century ago, there is still a need to improve therapeutic efficacy and patient convenience. A key challenge is the requirement for refrigeration to avoid inactivation of insulin by aggregation/fibrillation. Here, in an effort to mitigate this problem, we introduced a 4th disulfide bond between a C-terminal extended insulin A chain and residues near the C-terminus of the B chain. Insulin activity was retained by an analog with an additional disulfide bond between residues A22 and B22, while other linkages tested resulted in much reduced potency. Furthermore, the A22-B22 analog maintains the native insulin tertiary structure as demonstrated by X-ray crystal structure determination. We further demonstrate that this four-disulfide analog has similar in vivo potency in mice compared to native insulin and demonstrates higher aggregation stability. In conclusion, we have discovered a novel four-disulfide insulin analog with high aggregation stability and potency.
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Affiliation(s)
- Xiaochun Xiong
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
| | - Alan Blakely
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
| | - Prasoona Karra
- Department of Nutrition and Integrative Physiology , University of Utah , Salt Lake City UT 84112 , USA
| | - Michael A VandenBerg
- Department of Chemical & Biomolecular Engineering , University of Notre Dame , IN 46556 , USA
| | - Gabrielle Ghabash
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
| | - Frank Whitby
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
| | - Yi Wolf Zhang
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
| | - Matthew J Webber
- Department of Chemical & Biomolecular Engineering , University of Notre Dame , IN 46556 , USA
| | - William L Holland
- Department of Nutrition and Integrative Physiology , University of Utah , Salt Lake City UT 84112 , USA
| | - Christopher P Hill
- Department of Biochemistry , University of Utah , Salt Lake City UT 84112 , USA . ;
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Subbotin VM. A hypothesis on paradoxical privileged portal vein metastasis of hepatocellular carcinoma. Can organ evolution shed light on patterns of human pathology, and vice versa? Med Hypotheses 2019; 126:109-128. [PMID: 31010487 DOI: 10.1016/j.mehy.2019.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 02/25/2019] [Accepted: 03/21/2019] [Indexed: 02/06/2023]
Abstract
Unlike other carcinomas, hepatocellular carcinoma (HCC) metastasizes to distant organs relatively rarely. In contrast, it routinely metastasizes to liver vasculature/liver, affecting portal veins 3-10 times more often than hepatic veins. This portal metastatic predominance is traditionally rationalized within the model of a reverse portal flow, due to accompanying liver cirrhosis. However, this intuitive model is not coherent with facts: 1) reverse portal flow occurs in fewer than 10% of cirrhotic patients, while portal metastasis occurs in 30-100% of HCC cases, and 2) portal vein prevalence of HCC metastasis is also characteristic of HCC in non-cirrhotic livers. Therefore, we must assume that the route for HCC metastatic dissemination is the same as for other carcinomas: systemic dissemination via the draining vessel, i.e., via the hepatic vein. In this light, portal prevalence versus hepatic vein of HCC metastasis appears as a puzzling pattern, particularly in cases when portal HCC metastases have appeared as the sole manifestation of HCC. Considering that other GI carcinomas (colorectal, pancreatic, gastric and small bowel) invariably disseminate via portal vein, but very rarely form portal metastasis, portal prevalence of HCC metastasis appears as a paradox. However, nature does not contradict itself; it is rather our wrong assumptions that create paradoxes. The 'portal paradox' becomes a logical event within the hypothesis that the formation of the unique portal venous system preceded the appearance of liver in evolution of chordates. The analysis suggests that the appearance of the portal venous system, supplying hormones and growth factors of pancreatic family, which includes insulin, glucagon, somatostatin, and pancreatic polypeptide (HGFPF) to midgut diverticulum in the early evolution of chordates (in an Amphioxus-like ancestral animal), promoted differentiation of enterocytes into hepatocytes and their further evolution to the liver of vertebrates. These promotional-dependent interactions are conserved in the vertebrate lineage. I hypothesize that selective homing and proliferation of malignant hepatocytes (i.e., HCC cells) in the portal vein environment are due to a uniquely high concentration of HGFPF in portal blood. HGFPF are also necessary for liver function and renewal and are significantly extracted by hepatocytes from passing blood, creating a concentration gradient of HGFPF between the portal blood and hepatic vein outflow, making post-liver vasculature and remote organs less favorable spaces for HCC growth. It also suggested that the portal vein environment (i.e., HGFPF) promotes the differentiation of more aggressive HCC clones from already-seeded portal metastases, explaining the worse outcome of HCC with the portal metastatic pattern. The analysis also offers new hypothesis on the phylogenetic origin of the hepatic diverticulum of cephalochordates, with certain implications for the modeling of the chordate phylogeny.
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Affiliation(s)
- Vladimir M Subbotin
- Arrowhead Parmaceuticals, Madison, WI 53719, USA; University of Wisconsin, Madison, WI 53705, USA; University of Pittsburgh, Pittsburgh, PA 15260, USA.
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De Giovanni C, Nanni P, Landuzzi L, Ianzano ML, Nicoletti G, Croci S, Palladini A, Lollini PL. Immune targeting of autocrine IGF2 hampers rhabdomyosarcoma growth and metastasis. BMC Cancer 2019; 19:126. [PMID: 30732578 PMCID: PMC6367747 DOI: 10.1186/s12885-019-5339-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 01/31/2019] [Indexed: 11/18/2022] Open
Abstract
Background Insulin-like Growth Factor Receptor-1 (IGF1R) system sustains the genesis of rhabdomyosarcoma through IGF2 autocrine overexpression. While several IGF1R-targeted strategies have been investigated to interphere with rhabdomyosarcoma growth, no attempt to neutralize IGF2 has been reported. We therefore studied the possibility to hamper rhabdomyosarcoma growth with passive and active immune approaches targeting IGF2. Methods A murine model developing IGF2-overexpressing pelvic rhabdomyosarcoma, along with IGF2-independent salivary carcinoma, was used to investigate the efficacy and specificity of passive anti-IGFs antibody treatment. Active vaccinations with electroporated DNA plasmids encoding murine or human IGF2 were performed to elicit autochthonous anti-IGF2 antibodies. Vaccinated mice received the intravenous injection of rhabdomyosarcoma cells to study the effects of anti-IGF2 antibodies against developing metastases. Results Passive administration of antibodies neutralizing IGFs delayed the onset of IGF2-overexpressing rhabdomyosarcoma but not of IGF2-independent salivary carcinoma. A DNA vaccine against murine IGF2 did not elicit antibodies, even when combined with Treg-depletion, while a DNA vaccine encoding the human IGF2 gene elicited antibodies crossreacting with murine IGF2. Mice with anti-IGF2 antibodies were partially protected against the metastatic growth of IGF2-addicted rhabdomyosarcoma cells. Conclusions Immune targeting of autocrine IGF2 inhibited rhabdomyosarcoma genesis and metastatic growth.
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Affiliation(s)
- Carla De Giovanni
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy
| | - Patrizia Nanni
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy
| | - Lorena Landuzzi
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Marianna L Ianzano
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy
| | - Giordano Nicoletti
- Laboratory of Experimental Oncology, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Stefania Croci
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy.,Present address: Unit of Clinical Immunology, Allergy and Advanced Biotechnologies, Azienda Unità Sanitaria Locale-IRCCS, Reggio Emilia, Italy
| | - Arianna Palladini
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy
| | - Pier-Luigi Lollini
- Laboratory of Immunology and Biology of Metastasis, Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Viale Filopanti 22, I-40126, Bologna, Italy.
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Differential Sensitivity of Human Hepatocellular Carcinoma Xenografts to an IGF-II Neutralizing Antibody May Involve Activated STAT3. Transl Oncol 2018; 11:971-978. [PMID: 29933129 PMCID: PMC6020079 DOI: 10.1016/j.tranon.2018.05.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/24/2018] [Accepted: 05/24/2018] [Indexed: 01/11/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is highly refractory to current therapeutics used in the clinic. DX-2647, a recombinant human antibody, potently neutralizes the action of insulin-like growth factor-II (IGF-II), a ligand for three cell-surface receptors (IGF-IR, insulin receptor A and B isoforms, and the cation-independent mannose-6-phosphate receptor) which is overexpressed in primary human HCC. DX-2647 impaired the growth of tumor xenografts of the HCC cell line, Hep3B; however, xenografts of the HCC cell line, HepG2, were largely unresponsive to DX-2647 treatment. Analysis of a number of aspects of the IGF signaling axis in both cell lines did not reveal any significant differences between the two. However, while DX-2647 abolished phospho (p)-IGF-IR, p-IR and p-AKT signaling in both cell lines, HepG2 showed high levels of p-STAT3, which was unaffected by DX-2647 treatment and was absent from the Hep3B cell line. The driver of p-STAT3 was found to be a secreted cytokine, and treatment of HepG2 cells with a pan- JAK kinase inhibitor resulted in a loss of p-STAT3. These findings implicate the activation of STAT3 as one pathway that may mediate resistance to IGF-II-targeted therapy in HCC.
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Subbotin VM. Privileged portal metastasis of hepatocellular carcinoma in light of the coevolution of a visceral portal system and liver in the chordate lineage: a search for therapeutic targets. Drug Discov Today 2018; 23:548-564. [PMID: 29330122 DOI: 10.1016/j.drudis.2018.01.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 11/21/2017] [Accepted: 01/04/2018] [Indexed: 02/07/2023]
Abstract
Hepatocellular carcinoma (HCC) disseminates systemically, but metastases occur in distant organs only in minority of patients, whereas HCC routinely metastasizes to liver and its vessels. HCC cells disseminate via hepatic veins, but portal veins are affected by metastasis more frequently than are hepatic veins, and correlates with poor prognosis. In this review, I suggest that privileged HCC portal metastasis occurs because of high levels of pancreatic family hormones and growth factors (PHGFs) in the portal blood. The analysis suggests that the appearance of the portal system carrying PHGFs in the evolution of invertebrate chordate (Amphioxus) led to the evolution of the liver in vertebrate; given that the portal pattern of HCC metastasis and selection of more-aggressive clones are PHGF dependent, PHGFs and their ligands constitute therapeutic targets.
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Affiliation(s)
- Vladimir M Subbotin
- Department of Oncology, University of Wisconsin, Madison, WI 53705, USA; Department of Pathology, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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Strzalka-Mrozik B, Kimsa-Furdzik M, Kabiesz A, Michalska-Malecka K, Nita M, Mazurek U. Gene expression levels of the insulin-like growth factor family in patients with AMD before and after ranibizumab intravitreal injections. Clin Interv Aging 2017; 12:1401-1408. [PMID: 28919726 PMCID: PMC5592959 DOI: 10.2147/cia.s135030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Purpose The present study focused on the assessment of the mRNA levels of the insulin-like growth factor (IGF) family in patients with the exudative form of age-related macular degeneration (AMD) before and after ranibizumab intravitreal injections. Patients and methods An analysis of the expression profile of the IGF family of genes in patients with AMD was carried out using the oligonucleotide microarray and quantitative reverse transcriptase polymerase chain reaction (RT-qPCR) methods. Results In the peripheral blood mononuclear cells (PBMCs) obtained from AMD group receiving ranibizumab compared to the peripheral blood mononuclear cells from AMD group before ranibizumab treatment using oligonucleotide microarray technique, six statistically significant differentially expressed transcripts related to the IGF family were detected (unpaired t-test, p<0.05, fold change >1.5). Moreover, analysis using the real-time RT-qPCR technique revealed statistically significant differences in the IGF2 and IGF2R mRNA levels (Mann–Whitney U test, p<0.05) between the two groups that were studied. Statistical analyses of both oligonucleotide microarray and real-time RT-qPCR results demonstrated a significant decreased expression only for IGF2 mRNA. Conclusion Our results revealed a changed expression of IGF2 mRNA after ranibizumab treatment.
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Affiliation(s)
- Barbara Strzalka-Mrozik
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
| | - Malgorzata Kimsa-Furdzik
- Department of Biochemistry, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland
| | - Adam Kabiesz
- University Center for Ophthalmology and Oncology, Independent Public Clinical Hospital, Medical University of Silesia, Katowice, Poland
| | - Katarzyna Michalska-Malecka
- University Center for Ophthalmology and Oncology, Independent Public Clinical Hospital, Medical University of Silesia, Katowice, Poland.,Department of Ophthalmology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland
| | - Malgorzata Nita
- Domestic and Specialized Medicine Centre "Dilmed", Katowice, Poland
| | - Urszula Mazurek
- Department of Molecular Biology, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Poland
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Martinez-Quetglas I, Pinyol R, Dauch D, Torrecilla S, Tovar V, Moeini A, Alsinet C, Portela A, Rodriguez-Carunchio L, Solé M, Lujambio A, Villanueva A, Thung S, Esteller M, Zender L, Llovet JM. IGF2 Is Up-regulated by Epigenetic Mechanisms in Hepatocellular Carcinomas and Is an Actionable Oncogene Product in Experimental Models. Gastroenterology 2016; 151:1192-1205. [PMID: 27614046 DOI: 10.1053/j.gastro.2016.09.001] [Citation(s) in RCA: 228] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 08/23/2016] [Accepted: 09/01/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Effective treatments are urgently needed for hepatocellular carcinoma (HCC), which is usually diagnosed at advanced stages. Signaling via the insulin-like growth factor (IGF) pathway is aberrantly activated in HCC by IGF2 overexpression. We aimed to elucidate the mechanism of IGF2 overexpression and its oncogenic activities and evaluate the anti-tumor effects of reducing IGF2 signaling. METHODS We obtained 228 HCC samples from patients who underwent liver resection, 168 paired non-tumor adjacent cirrhotic liver samples, and 10 non-tumor liver tissues from patients undergoing resection for hepatic hemangioma. We analyzed gene expression, microRNA, and DNA methylation profiles for all samples, focusing on genes in the IGF signaling pathway. IGF2 was expressed in SNU449 and PLC5 HCC cells and knocked down with small hairpin RNAs in Hep3B and Huh7 cell lines. We analyzed these cells for proliferation, apoptosis, migration, and colony formation. We performed studies in mice engineered to express Myc and Akt1 in liver, which develop liver tumors, with or without hepatic expression of Igf2. Mice with xenograft tumors grown from HCC cells were given a monoclonal antibody against IGF1 and IGF2 (xentuzumab), along with sorafenib; tumor growth was measured and tissues were analyzed by immunohistochemistry and immunoblots. RESULTS Levels of IGF2 messenger RNA and protein were increased >20-fold in 15% of human HCC tissues compared with non-tumor liver tissues. Methylation at the fetal promoters of IGF2 was reduced in the HCC samples and cell lines that overexpressed IGF2, compared with those that did not overexpress this gene, and non-tumor tissues. Tumors that overexpressed IGF2 had gene expression patterns significantly associated with hepatic progenitor cell features, stellate cell activation, NOTCH signaling, and an aggressive phenotype (P < .0001). In mice engineered to express Myc and Akt1 in liver, co-expression of Igf2 accelerated formation of liver tumors, compared to mice with livers expressing only Myc and Akt1, and shortened survival times (P = .02). The antibody xentuzumab blocked phosphorylation of IGF1 receptor in HCC cell lines and reduced their proliferation and colony formation. In mice with xenograft tumors, injection of xentuzumab, with or without sorafenib, slowed tumor growth and increased survival times compared to vehicle or sorafenib alone. Xentuzumab inhibited phosphorylation of IGF1 receptor and AKT and reduced decreased tumor vascularization compared with vehicle. CONCLUSIONS A large proportion of HCC samples were found to overexpress IGF2, via demethylation of its fetal promoter. Overexpression of IGF2 accelerates formation of liver tumors in mice with hepatic expression of MYC and AKT1, via activation of IGF1 receptor signaling. An antibody against IGF1 and IGF2 slows growth of xenograft tumors and increases survival of these mice.
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Affiliation(s)
- Iris Martinez-Quetglas
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Roser Pinyol
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Daniel Dauch
- Division of Translational Gastrointestinal Oncology, Department of Internal Medicine I, University of Tübingen, Tübingen, Germany
| | - Sara Torrecilla
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Victoria Tovar
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Agrin Moeini
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Clara Alsinet
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Anna Portela
- Cancer Epigenetics and Biology Program, Bellvitge Biomedical Research Institute, Barcelona, Catalonia, Spain
| | - Leonardo Rodriguez-Carunchio
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Manel Solé
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain
| | - Amaia Lujambio
- Liver Cancer Program, Division of Liver Diseases and Pathology Department, Tisch Cancer Institute, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York; Oncological Sciences Department, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Augusto Villanueva
- Liver Cancer Program, Division of Liver Diseases and Pathology Department, Tisch Cancer Institute, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York; Division of Hematology and Medical Oncology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Swan Thung
- Liver Cancer Program, Division of Liver Diseases and Pathology Department, Tisch Cancer Institute, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Manel Esteller
- Cancer Epigenetics and Biology Program, Bellvitge Biomedical Research Institute, Barcelona, Catalonia, Spain; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Catalonia, Spain
| | - Lars Zender
- Division of Translational Gastrointestinal Oncology, Department of Internal Medicine I, University of Tübingen, Tübingen, Germany; Translational Gastrointestinal Oncology Group within the German Center for Translational Cancer Research, German Cancer Research Center, Heidelberg, Germany
| | - Josep M Llovet
- Liver Cancer Translational Research Laboratory, Barcelona Clinic Liver Cancer Group, Liver Unit, IDIBAPS-Hospital Clínic de Barcelona, CIBERehd Universitat de Barcelona, Catalonia, Spain; Liver Cancer Program, Division of Liver Diseases and Pathology Department, Tisch Cancer Institute, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Catalonia, Spain.
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12
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Abstract
INTRODUCTION Adrenal tumor is a relatively common tumor. The discrimination between adrenal cortical adenoma (ACA) and adrenal cortical carcinoma (ACC) is crucial as these two diseases have distinct prognosis. ACA is a benign tumor curable by surgical excision, while the prognosis of ACC is extremely poor, with a 5-year mortality of 75-90%. Therefore, previous proteomic studies focused on markers allowing the differentiation between ACA and ACC. AREAS COVERED Several proteomic approaches based on the analysis of various samples such as human tissues, urine, and cell lines. In this review, we focused on proteomic studies performed to improve adrenal tumor diagnosis and identify ACC therapeutic targets. Expert commentary: The rapid development of cancer genomics provided a lot of information, which affects functional proteomics. In practice, differentially expressed proteins between ACA and ACC have been suggested in several proteomic studies and had a biologic implication in ACC.
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Affiliation(s)
- Hye Min Kim
- a Department of Pathology , Yonsei University College of Medicine , Seoul , South Korea
| | - Yu Kyung Lee
- a Department of Pathology , Yonsei University College of Medicine , Seoul , South Korea
| | - Ja Seung Koo
- a Department of Pathology , Yonsei University College of Medicine , Seoul , South Korea
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13
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Frago S, Nicholls RD, Strickland M, Hughes J, Williams C, Garner L, Surakhy M, Maclean R, Rezgui D, Prince SN, Zaccheo OJ, Ebner D, Sanegre S, Yu S, Buffa FM, Crump MP, Hassan AB. Functional evolution of IGF2:IGF2R domain 11 binding generates novel structural interactions and a specific IGF2 antagonist. Proc Natl Acad Sci U S A 2016; 113:E2766-75. [PMID: 27140600 PMCID: PMC4878476 DOI: 10.1073/pnas.1513023113] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Among the 15 extracellular domains of the mannose 6-phosphate/insulin-like growth factor-2 receptor (M6P/IGF2R), domain 11 has evolved a binding site for IGF2 to negatively regulate ligand bioavailability and mammalian growth. Despite the highly evolved structural loops of the IGF2:domain 11 binding site, affinity-enhancing AB loop mutations suggest that binding is modifiable. Here we examine the extent to which IGF2:domain 11 affinity, and its specificity over IGF1, can be enhanced, and we examine the structural basis of the mechanistic and functional consequences. Domain 11 binding loop mutants were selected by yeast surface display combined with high-resolution structure-based predictions, and validated by surface plasmon resonance. We discovered previously unidentified mutations in the ligand-interacting surface binding loops (AB, CD, FG, and HI). Five combined mutations increased rigidity of the AB loop, as confirmed by NMR. When added to three independently identified CD and FG loop mutations that reduced the koff value by twofold, these mutations resulted in an overall selective 100-fold improvement in affinity. The structural basis of the evolved affinity was improved shape complementarity established by interloop (AB-CD) and intraloop (FG-FG) side chain interactions. The high affinity of the combinatorial domain 11 Fc fusion proteins functioned as ligand-soluble antagonists or traps that depleted pathological IGF2 isoforms from serum and abrogated IGF2-dependent signaling in vivo. An evolved and reengineered high-specificity M6P/IGF2R domain 11 binding site for IGF2 may improve therapeutic targeting of the frequent IGF2 gain of function observed in human cancer.
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Affiliation(s)
- Susana Frago
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Ryan D Nicholls
- Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Madeleine Strickland
- Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Jennifer Hughes
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Christopher Williams
- Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Lee Garner
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Mirvat Surakhy
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Rory Maclean
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Dellel Rezgui
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Stuart N Prince
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Oliver J Zaccheo
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Daniel Ebner
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, United Kingdom
| | - Sabina Sanegre
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | - Sheng Yu
- Department of Oncology, University of Oxford, Oxford OX3 7DQ, United Kingdom
| | - Francesca M Buffa
- Department of Oncology, University of Oxford, Oxford OX3 7DQ, United Kingdom
| | - Matthew P Crump
- Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom;
| | - Andrew Bassim Hassan
- Tumour Growth Control Group, Oxford Molecular Pathology Institute, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom;
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14
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Chettouh H, Lequoy M, Fartoux L, Vigouroux C, Desbois-Mouthon C. Hyperinsulinaemia and insulin signalling in the pathogenesis and the clinical course of hepatocellular carcinoma. Liver Int 2015; 35:2203-17. [PMID: 26123841 DOI: 10.1111/liv.12903] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 06/09/2015] [Indexed: 12/11/2022]
Abstract
Hepatocellular carcinoma (HCC) is the fifth most prevalent cancer and is one of the leading causes of cancer-related death. The risk factors for HCC include cirrhosis, chronic viral hepatitis, heavy alcohol intake and metabolic diseases such as obesity, type 2 diabetes and metabolic syndrome. Insulin resistance is a common denominator of all of these conditions and is tethered to hyperinsulinaemia. Here, we give an overview of the recent advances linking hyperinsulinaemia to HCC development and progression. In particular, we summarise the underlying causes of hyperinsulinaemia in the setting of chronic liver diseases. We present epidemiological evidence linking metabolic diseases to HCC risk and HCC-related mortality, as well as the pathogenic cellular and molecular mechanisms explaining this relation. A better understanding of the mechanisms by which insulin participates in HCC biology might ultimately provide novel opportunities for prevention and treatment.
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Affiliation(s)
- Hamza Chettouh
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France
| | - Marie Lequoy
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,Service d'Hépatologie, AP-HP, Hôpital Saint-Antoine, Paris, France
| | - Laetitia Fartoux
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,Service d'Hépatologie, AP-HP, Hôpital Saint-Antoine, Paris, France
| | - Corinne Vigouroux
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,Laboratoire Commun de Biologie et Génétique Moléculaires AP-HP, Hôpital Saint-Antoine, Paris, France.,ICAN, Institute of Cardiometabolism and Nutrition, Paris, France
| | - Christèle Desbois-Mouthon
- Sorbonne Universités, UPMC Univ Paris 06, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France.,INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Paris, France
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15
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Zhao Q, Tran H, Dimitrov DS, Cheung NKV. A dual-specific anti-IGF-1/IGF-2 human monoclonal antibody alone and in combination with temsirolimus for therapy of neuroblastoma. Int J Cancer 2015; 137:2243-52. [PMID: 25924852 DOI: 10.1002/ijc.29588] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 04/14/2015] [Indexed: 12/16/2022]
Abstract
The insulin-like growth factors (IGFs), IGF-1 and IGF-2, have been implicated in the growth, survival and metastasis of a broad range of malignancies including pediatric tumors. They bind to the IGF receptor type 1 (IGF-1R) and the insulin receptor (IR) which are overexpressed in many types of solid malignancies. Activation of the IR by IGF-2 results in increased survival of tumor cells. We have previously identified a novel human monoclonal antibody, m708.5, which binds with high (pM) affinity to both human IGF-1 and IGF-2, and potently inhibits phosphorylation of the IGF-1R and the IR in tumor cells. m708.5 exhibited strong antitumor activity as a single agent against most cell lines derived from neuroblastoma, Ewing family of tumor, rhabdomyosarcoma and osteosarcoma. When tested in neuroblastoma cell lines, it showed strong synergy with temsirolimus and synergy with chemotherapeutic agents in vitro. In xenograft models, the combination of m708.5 and temsirolimus significantly inhibited neuroblastoma growth and prolonged mouse survival. Taken together, these results support the clinical development of m708.5 for pediatric solid tumors with potential for synergy with chemotherapy and mTOR inhibitors.
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Affiliation(s)
- Qi Zhao
- Department of Pediatrics, Memorial Sloan-Kettering Cancer Center, New York, NY.,Laboratory of Fully Human Antibody Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Guangdong, China
| | - Hoa Tran
- Department of Pediatrics, Memorial Sloan-Kettering Cancer Center, New York, NY
| | - Dimiter S Dimitrov
- Protein Interaction Section, Laboratory of Experimental Immunology, Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute-Frederick, National Institutes of Health, Frederick, MD, USA
| | - Nai-Kong V Cheung
- Department of Pediatrics, Memorial Sloan-Kettering Cancer Center, New York, NY
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16
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Brouwer-Visser J, Huang GS. IGF2 signaling and regulation in cancer. Cytokine Growth Factor Rev 2015; 26:371-7. [PMID: 25704323 DOI: 10.1016/j.cytogfr.2015.01.002] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 01/27/2015] [Indexed: 12/12/2022]
Abstract
Upregulation of IGF2 occurs in both childhood and adult malignancies. Its overexpression is associated with resistance to chemotherapy and worse prognosis. IGF2 promoter usage is developmentally regulated; however, malignant tissues are characterized by re-activation of the fetal IGF2 promoters, especially P3. In this review, we describe the mechanisms of IGF2 signaling and regulation in normal and malignant tissues and their clinical implications.
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Affiliation(s)
- Jurriaan Brouwer-Visser
- Department of Obstetrics and Gynecology & Women's Health (Division of Gynecologic Oncology), Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY, United States; Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, United States
| | - Gloria S Huang
- Department of Obstetrics and Gynecology & Women's Health (Division of Gynecologic Oncology), Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY, United States; Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, United States; Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY, United States.
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17
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Tang S, Hu W, Hu J, Wu S, Li J, Luo Y, Cao M, Zhou H, Jiang X. Hepatitis B virus X protein promotes P3 transcript expression of the insulin-like growth factor 2 gene via inducing hypomethylation of P3 promoter in hepatocellular carcinoma. Liver Int 2015; 35:608-19. [PMID: 24423280 DOI: 10.1111/liv.12469] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 01/08/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS Hepatitis B virus (HBV) X protein (HBx) contributes to hepatocarcinogenesis. The overexpression of transcripts from P3 and P4 promoters of the insulin-like growth factor 2 (IGF2) gene is observed in hepatocellular carcinoma (HCC). Here, we aimed to explore the involvement of HBx in P3-driven mRNA overexpression and underlying epigenetic mechanism. METHODS P3 mRNA, P3 methylation status, HBx mRNA and HBx protein were analysed in human HCC samples with and without HBV infection using quantitative RT-PCR, bisulphite sequencing and Western blotting. The effects of HBx on P3 mRNA expression, and P3 transcriptional activity and methylation were further evaluated in HCC cell lines. RESULTS P3 mRNA level was higher and P3 methylation level was lower in HBV-positive HCC specimens compared with those of HBV-negative HCC specimens. P3 transcript abundance was positively correlated with HBx expression and negatively correlated with P3 methylation in HCC specimens. The stable expression of HBx upregulated P3 mRNA expression and reduced P3 methylation level in HepG2-HBx cells. The transient expression of HBx stimulated P3 promoter activity and decreased P3 methylation level of P3 promoter-luciferase construct in a dose-dependent manner in HepG2 and Huh-7 cells. Furthermore, HBx mRNA expression was found to be independent predictive factors for both shorter disease-free survival time and shorter overall survival time of HCC patients. CONCLUSION HBx may promote IGF2-P3 transcript expression by inducing hypomethylation of P3 promoter and may be associated with an inferior clinical outcome of HBV-related HCC patients. This study provides useful information for understanding the mechanism of HBx-mediated HCC.
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Affiliation(s)
- Shaohui Tang
- Department of Gastroenterology, The First Affiliated Hospital, Jinan University, Guangzhou, China
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18
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Abstract
Endothelial cells line blood vessels and modulate vascular tone, thrombosis, inflammatory responses and new vessel formation. They are implicated in many disease processes including atherosclerosis and cancer. IGFs play a significant role in the physiology of endothelial cells by promoting migration, tube formation and production of the vasodilator nitric oxide. These actions are mediated by the IGF1 and IGF2/mannose 6-phosphate receptors and are modulated by a family of high-affinity IGF binding proteins. IGFs also increase the number and function of endothelial progenitor cells, which may contribute to protection from atherosclerosis. IGFs promote angiogenesis, and dysregulation of the IGF system may contribute to this process in cancer and eye diseases including retinopathy of prematurity and diabetic retinopathy. In some situations, IGF deficiency appears to contribute to endothelial dysfunction, whereas IGF may be deleterious in others. These differences may be due to tissue-specific endothelial cell phenotypes or IGFs having distinct roles in different phases of vascular disease. Further studies are therefore required to delineate the therapeutic potential of IGF system modulation in pathogenic processes.
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Affiliation(s)
- Leon A Bach
- Department of Medicine (Alfred)Monash University, Prahran 3181, AustraliaDepartment of Endocrinology and DiabetesAlfred Hospital, Commercial Road, Melbourne 3004, Australia Department of Medicine (Alfred)Monash University, Prahran 3181, AustraliaDepartment of Endocrinology and DiabetesAlfred Hospital, Commercial Road, Melbourne 3004, Australia
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19
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Pantazes RJ, Grisewood MJ, Li T, Gifford NP, Maranas CD. The Iterative Protein Redesign and Optimization (IPRO) suite of programs. J Comput Chem 2014; 36:251-63. [PMID: 25448866 DOI: 10.1002/jcc.23796] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 10/30/2014] [Accepted: 11/08/2014] [Indexed: 11/10/2022]
Abstract
Proteins are an important class of biomolecules with applications spanning across biotechnology and medicine. In many cases, native proteins must be redesigned to improve various performance metrics by changing their amino acid sequences. Algorithms can help sharpen protein library design by focusing the library on sequences that optimize computationally accessible proxies. The Iterative Protein Redesign and Optimization (IPRO) suite of programs offers an integrated environment for (1) altering protein binding affinity and specificity, (2) grafting a binding pocket into an existing protein scaffold, (3) predicting an antibody's tertiary structure based on its sequence, (4) enhancing enzymatic activity, and (5) assessing the structure and binding energetics for a specific mutant. This manuscript provides an overview of the methods involved in IPRO, input language terminology, algorithmic details, software implementation specifics and application highlights. IPRO can be downloaded at http://maranas.che.psu.edu.
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Affiliation(s)
- Robert J Pantazes
- Chemical Engineering Department, University of California, Santa Barbara, 3357 Engineering II, Santa Barbara, California, 93106
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20
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Enguita-Germán M, Fortes P. Targeting the insulin-like growth factor pathway in hepatocellular carcinoma. World J Hepatol 2014; 6:716-737. [PMID: 25349643 PMCID: PMC4209417 DOI: 10.4254/wjh.v6.i10.716] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 07/14/2014] [Accepted: 08/31/2014] [Indexed: 02/06/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths worldwide. Only 30%-40% of the patients with HCC are eligible for curative treatments, which include surgical resection as the first option, liver transplantation and percutaneous ablation. Unfortunately, there is a high frequency of tumor recurrence after surgical resection and most HCC seem resistant to conventional chemotherapy and radiotherapy. Sorafenib, a multi-tyrosine kinase inhibitor, is the only chemotherapeutic option for patients with advanced hepatocellular carcinoma. Patients treated with Sorafenib have a significant increase in overall survival of about three months. Therefore, there is an urgent need to develop alternative treatments. Due to its role in cell growth and development, the insulin-like growth factor system is commonly deregulated in many cancers. Indeed, the insulin-like growth factor (IGF) axis has recently emerged as a potential target for hepatocellular carcinoma treatment. To this aim, several inhibitors of the pathway have been developed such as monoclonal antibodies, small molecules, antisense oligonucleotides or small interfering RNAs. However recent studies suggest that, unlike most tumors, HCC development requires increased signaling through insulin growth factor II rather than insulin growth factor I. This may have great implications in the future treatment of HCC. This review summarizes the role of the IGF axis in liver carcinogenesis and the current status of the strategies designed to target the IGF-I signaling pathway for hepatocellular carcinoma treatment.
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21
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Exogenous administration of protease-resistant, non-matrix-binding IGFBP-2 inhibits tumour growth in a murine model of breast cancer. Br J Cancer 2014; 110:2855-64. [PMID: 24853186 PMCID: PMC4056053 DOI: 10.1038/bjc.2014.232] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 04/06/2014] [Accepted: 04/08/2014] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Insulin-like growth factors (IGF-I and IGF-II) signal via the type 1 IGF receptor (IGF-1R) and IGF-II also activates the insulin receptor isoform A (IR-A). Signalling via both receptors promotes tumour growth, survival and metastasis. In some instances IGF-II action via the IR-A also promotes resistance to anti-IGF-1R inhibitors. This study assessed the efficacy of two novel modified IGF-binding protein-2 (IGFBP-2) proteins that were designed to sequester both IGFs. The two modified IGFBP-2 proteins were either protease resistant alone or also lacked the ability to bind extracellular matrix (ECM). METHODS The modified IGFBP-2 proteins were tested in vitro for their abilities to inhibit cancer cell proliferation and in vivo to inhibit MCF-7 breast tumour xenograft growth. RESULTS Both mutants retained low nanomolar affinity for IGF-I and IGF-II (0.8-2.1-fold lower than IGFBP-2) and inhibited cancer cell proliferation in vitro. However, the combined protease resistant, non-matrix-binding mutant was more effective in inhibiting MCF-7 tumour xenograft growth and led to inhibition of angiogenesis. CONCLUSIONS By removing protease cleavage and matrix-binding sites, modified IGFBP-2 was effective in inhibiting tumour growth and reducing tumour angiogenesis.
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22
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Something old, something new and something borrowed: emerging paradigm of insulin-like growth factor type 1 receptor (IGF-1R) signaling regulation. Cell Mol Life Sci 2013; 71:2403-27. [PMID: 24276851 PMCID: PMC4055838 DOI: 10.1007/s00018-013-1514-y] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 10/17/2013] [Accepted: 11/07/2013] [Indexed: 12/14/2022]
Abstract
The insulin-like growth factor type 1 receptor (IGF-1R) plays a key role in the development and progression of cancer; however, therapeutics targeting it have had disappointing results in the clinic. As a receptor tyrosine kinase (RTK), IGF-1R is traditionally described as an ON/OFF system, with ligand stabilizing the ON state and exclusive kinase-dependent signaling activation. Newly added to the traditional model, ubiquitin-mediated receptor downregulation and degradation was originally described as a response to ligand/receptor interaction and thus inseparable from kinase signaling activation. Yet, the classical model has proven over-simplified and insufficient to explain experimental evidence accumulated over the last decade, including kinase-independent signaling, unbalanced signaling, or dissociation between signaling and receptor downregulation. Based on the recent findings that IGF-1R “borrows” components of G-protein coupled receptor (GPCR) signaling, including β-arrestins and G-protein-related kinases, we discuss the emerging paradigm for the IGF-1R as a functional RTK/GPCR hybrid, which integrates the kinase signaling with the IGF-1R canonical GPCR characteristics. The contradictions to the classical IGF-1R signaling concept as well as the design of anti-IGF-1R therapeutics treatment are considered in the light of this paradigm shift and we advocate recognition of IGF-1R as a valid target for cancer treatment.
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23
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Targeting tumor micro-environment for design and development of novel anti-angiogenic agents arresting tumor growth. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2013; 113:333-54. [PMID: 24139944 DOI: 10.1016/j.pbiomolbio.2013.10.001] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 10/05/2013] [Accepted: 10/08/2013] [Indexed: 12/12/2022]
Abstract
Angiogenesis: a process of generation of new blood vessels has been proved to be necessary for sustained tumor growth and cancer progression. Inhibiting angiogenesis pathway has long been remained a significant hope for the development of novel, effective and target orientated antitumor agents arresting the tumor proliferation and metastasis. The process of neoangiogenesis as a biological process is regulated by several pro- and anti-angiogenic factors, especially vascular endothelial growth factor, fibroblast growth factor, epidermal growth factor, hypoxia inducible factor 1 and transforming growth factor. Every endothelial cell destined for vessel formation is equipped with receptors for these angiogenic peptides. Moreover, numerous other angiogenic cytokines such as platelet derived growth factor (PGDF), placenta growth factor (PGF), nerve growth factor (NGF), stem-cell factor (SCF), and interleukins-2, 4, 6 etc. These molecular players performs critical role in regulating the angiogenic switch. Couple of decade's research in molecular aspects of tumor biology has unraveled numerous structural and functional mysteries of these angiogenic peptides. In present article, a detailed update on the functional and structural peculiarities of the various angiogenic peptides is described focusing on structural opportunities made available that has potential to be used to modulate function of these angiogenic peptides in developing therapeutic agents targeting neoplastic angiogenesis. The data may be useful in the mainstream of developing novel anticancer agents targeting tumor angiogenesis. We also discuss major therapeutic agents that are currently used in angiogenesis associated therapies as well as those are subject of active research or are in clinical trials.
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24
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Glim JE, van Egmond M, Niessen FB, Everts V, Beelen RHJ. Detrimental dermal wound healing: what can we learn from the oral mucosa? Wound Repair Regen 2013; 21:648-60. [PMID: 23927738 DOI: 10.1111/wrr.12072] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Accepted: 06/01/2013] [Indexed: 12/11/2022]
Abstract
Wounds in adults are frequently accompanied by scar formation. This scar can become fibrotic due to an imbalance between extracellular matrix (ECM) synthesis and ECM degradation. Oral mucosal wounds, however, heal in an accelerated fashion, displaying minimal scar formation. The exact mechanisms of scarless oral healing are yet to be revealed. This review highlights possible mechanisms involved in the difference between scar-forming dermal vs. scarless oral mucosal wound healing. Differences were found in expression of ECM components, such as procollagen I and tenascin-C. Oral wounds contained fewer immune mediators, blood vessels, and profibrotic mediators but had more bone marrow-derived cells, a higher reepithelialization rate, and faster proliferation of fibroblasts compared with dermal wounds. These results form a basis for further research that should be focused on the relations among ECM, immune cells, growth factors, and fibroblast phenotypes, as understanding scarless oral mucosal healing may ultimately lead to novel therapeutic strategies to prevent fibrotic scars.
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Affiliation(s)
- Judith E Glim
- Department of Molecular Cell Biology & Immunology, VU University Medical Center, Amsterdam, The Netherlands; Department of Plastic and Reconstructive Surgery, VU University Medical Center, Amsterdam, The Netherlands
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25
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Greenall SA, Bentley JD, Pearce LA, Scoble JA, Sparrow LG, Bartone NA, Xiao X, Baxter RC, Cosgrove LJ, Adams TE. Biochemical characterization of individual human glycosylated pro-insulin-like growth factor (IGF)-II and big-IGF-II isoforms associated with cancer. J Biol Chem 2012; 288:59-68. [PMID: 23166326 DOI: 10.1074/jbc.m112.432013] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Insulin-like growth factor II (IGF-II) is a major embryonic growth factor belonging to the insulin-like growth factor family, which includes insulin and IGF-I. Its expression in humans is tightly controlled by maternal imprinting, a genetic restraint that is lost in many cancers, resulting in up-regulation of both mature IGF-II mRNA and protein expression. Additionally, increased expression of several longer isoforms of IGF-II, termed "pro" and "big" IGF-II, has been observed. To date, it is ambiguous as to what role these IGF-II isoforms have in initiating and sustaining tumorigenesis and whether they are bioavailable. We have expressed each individual IGF-II isoform in their proper O-glycosylated format and established that all bind to the IGF-I receptor and both insulin receptors A and B, resulting in their activation and subsequent stimulation of fibroblast proliferation. We also confirmed that all isoforms are able to be sequestered into binary complexes with several IGF-binding proteins (IGFBP-2, IGFBP-3, and IGFBP-5). In contrast to this, ternary complex formation with IGFBP-3 or IGFBP-5 and the auxillary protein, acid labile subunit, was severely diminished. Furthermore, big-IGF-II isoforms bound much more weakly to purified ectodomain of the natural IGF-II scavenging receptor, IGF-IIR. IGF-II isoforms thus possess unique biological properties that may enable them to escape normal sequestration avenues and remain bioavailable in vivo to sustain oncogenic signaling.
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Affiliation(s)
- Sameer A Greenall
- Division of Materials Science and Engineering, Commonwealth Scientific and Industrial Research Organisation, Parkville, Victoria 3052, Australia
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Chen W, Feng Y, Zhao Q, Zhu Z, Dimitrov DS. Human monoclonal antibodies targeting nonoverlapping epitopes on insulin-like growth factor II as a novel type of candidate cancer therapeutics. Mol Cancer Ther 2012; 11:1400-10. [PMID: 22553356 DOI: 10.1158/1535-7163.mct-12-0172] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Soluble ligands are important targets for therapy of cancers and other diseases. Therapeutic monoclonal antibodies (mAb) against such ligands block their interactions with corresponding receptors but do not enhance their removal from the circulation and can increase their half-lives because of the long half-lives of the antibodies. We have hypothesized that mAbs targeting two or more nonoverlapping epitopes on the same ligand could form oligomeric antibody-ligand complexes that can bind to cells expressing Fc gamma receptors (FcγRs) with high avidity leading to their fast and irreversible removal from the circulation. Insulin-like growth factor II (IGF-II) is an example of such ligands and an important target for human cancer therapy. We identified two mAbs, m610.27 and m630.3, which bound to nonoverlapping epitopes on IGF-II with nanomolar affinity, and generated a bispecific antibody, m660. m660 inhibited the interaction of human IGF-II (hIGF-II) with the human breast cancer cell line MCF-7, hIGF-II-mediated IGF receptor type I and insulin receptor phosphorylation, and cell growth. In the presence of hIGF-II, large complexes of m660 were formed that bound to FcγRII-expressing BJAB cells much more efficiently than the monospecific antibody-hIGF-II complexes and were presumably phagocytosed by phorbol 12-myristate 13-acetate-stimulated macrophage-like U937 cells. A mixture of m610.27 and m630.3 exhibited similar properties. To our knowledge, these mAbs are the first reported to target nonoverlapping epitopes on a cancer-related ligand and could represent a novel class of candidate therapeutics against cancers. This approach could also be used to irreversibly eliminate other disease-related soluble ligands.
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Affiliation(s)
- Weizao Chen
- Protein Interactions Group, Frederick National Laboratory for Cancer Research, National Cancer Institute, NIH, Frederick, Maryland 21702, USA
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Schiefner A, Chatwell L, Körner J, Neumaier I, Colby DW, Volkmer R, Wittrup KD, Skerra A. A disulfide-free single-domain V(L) intrabody with blocking activity towards huntingtin reveals a novel mode of epitope recognition. J Mol Biol 2011; 414:337-55. [PMID: 21968397 DOI: 10.1016/j.jmb.2011.09.034] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 09/19/2011] [Accepted: 09/20/2011] [Indexed: 10/17/2022]
Abstract
We present the crystal structure and biophysical characterization of a human V(L) [variable domain immunoglobulin (Ig) light chain] single-domain intrabody that binds to the huntingtin (Htt) protein and has been engineered for antigen recognition in the absence of its intradomain disulfide bond, otherwise conserved in the Ig fold. Analytical ultracentrifugation demonstrated that the αHtt-V(L) 12.3 domain is a stable monomer under physiological conditions even at concentrations >20 μM. Using peptide SPOT arrays, we identified the minimal binding epitope to be EKLMKAFESLKSFQ, comprising the N-terminal residues 5-18 of Htt and including the first residue of the poly-Gln stretch. X-ray structural analysis of αHtt-V(L) both as apo protein and in the presence of the epitope peptide revealed several interesting insights: first, the role of mutations acquired during the combinatorial selection process of the αHtt-V(L) 12.3 domain-initially starting from a single-chain Fv fragment-that are responsible for its stability as an individually soluble Ig domain, also lacking the disulfide bridge, and second, a previously unknown mode of antigen recognition, revealing a novel paratope. The Htt epitope peptide adopts a purely α-helical structure in the complex with αHtt-V(L) and is bound at the base of the complementarity-determining regions (CDRs) at the concave β-sheet that normally gives rise to the interface between the V(L) domain and its paired V(H) (variable domain Ig heavy chain) domain, while only few interactions with CDR-L1 and CDR-L3 are formed. Notably, this noncanonical mode of antigen binding may occur more widely in the area of in vitro selected antibody fragments, including other Ig-like scaffolds, possibly even if a V(H) domain is present.
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Affiliation(s)
- André Schiefner
- Munich Center for Integrated Protein Science and Lehrstuhl für Biologische Chemie, Technische Universität München, 85350 Freising-Weihenstephan, Germany
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Zhao Q, Feng Y, Zhu Z, Dimitrov DS. Human monoclonal antibody fragments binding to insulin-like growth factors I and II with picomolar affinity. Mol Cancer Ther 2011; 10:1677-85. [PMID: 21750218 PMCID: PMC3170999 DOI: 10.1158/1535-7163.mct-11-0281] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The type 1 insulin-like growth factor receptor (IGF1R) and its ligands (IGF-I and IGF-II) have been implicated in a variety of physiologic processes and in diseases such as cancer. In addition to IGF1R, IGF-II also activates the insulin receptor (IR) isoform A, and therefore, antibodies against IGF-II can inhibit cell proliferation mediated by the signaling through both IGF1R and IR triggered by IGF-II. We identified a new human monoclonal antibody (mAb), m708.2, which is bound to IGF-I and IGF-II but not to insulin. m708.2 potently inhibited signal transduction mediated by the interaction of IGF-I or IGF-II with the IGF1R and IGF-II with the IR. It also inhibited the growth of the breast cancer cell line MCF-7. An affinity-matured derivative of m708.2, m708.5, bound to IGF-I with equilibrium dissociation constant, K(D) = 200 pmol/L and to IGF-II with K(D) = 60 pmol/L. m708.5 inhibited signal transduction mediated by IGF-I and IGF-II and cancer cell growth more potently than m708.2. These results suggest that m708.5 could have potential as a candidate therapeutic for cancers driven by the IGF-I and IGF-II interactions with IGF1R and IR.
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Affiliation(s)
- Qi Zhao
- Protein Interactions Group, Center for Cancer Research Nanobiology Program, National Cancer Institute (NCI)-Frederick, National Institutes of Health (NIH), Frederick, MD 21702-1201, USA
| | - Yang Feng
- Protein Interactions Group, Center for Cancer Research Nanobiology Program, National Cancer Institute (NCI)-Frederick, National Institutes of Health (NIH), Frederick, MD 21702-1201, USA
| | - Zhongyu Zhu
- Protein Interactions Group, Center for Cancer Research Nanobiology Program, National Cancer Institute (NCI)-Frederick, National Institutes of Health (NIH), Frederick, MD 21702-1201, USA
| | - Dimiter S. Dimitrov
- Protein Interactions Group, Center for Cancer Research Nanobiology Program, National Cancer Institute (NCI)-Frederick, National Institutes of Health (NIH), Frederick, MD 21702-1201, USA
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Establishment of platform for screening insulin-like growth factor-1 receptor inhibitors and evaluation of novel inhibitors. Acta Pharmacol Sin 2011; 32:930-8. [PMID: 21643004 DOI: 10.1038/aps.2011.23] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
AIM The insulin-like growth factor-1 receptor (IGF1R) is over-expressed in a wide variety of tumors and contributes to tumor cell proliferation, metastasis and drug resistance. The aim of this study was to establish a sensitive screening platform to identify novel IGF1R inhibitors. METHODS The catalytic domain of IGF1R was expressed using the Bac-to-Bac baculovirus expression system. The screening platform for IGF1R inhibitors was established based on ELISA. The binding profile of IGF1R with the inhibitors was predicted with molecular docking and then subjected to the surface plasmon resonance (SPR) approach. The growth inhibition of cancer cells by the inhibitors was assessed with MTT assay. Apoptosis was analyzed using flow cytometry and Western blotting. RESULTS A naturally occurring small molecule compound hematoxylin was identified as the most potent inhibitor (IC₅₀ value=1.8±0.1 μmol/L) within a library of more than 200 compounds tested. Molecular simulation predicted the possible binding mode of hematoxylin with IGF1R. An SPR assay further confirmed that hematoxylin bound directly to IGF1R with high binding affinity (Kd=4.2 × 10⁻⁶ mol/L). In HL-60 cancer cells, hematoxylin inactivated the phosphorylation of IGF1R and downstream signaling and therefore suppressed cell proliferation. Mechanistic studies revealed that hematoxylin induced apoptosis in HL-60 cells via both extrinsic and intrinsic pathways. CONCLUSION A simple, sensitive ELISA-based screening platform for identifying IGF1R inhibitors was established. Hematoxylin was identified as a promising IGF1R inhibitor with effective antitumor activity that deserves further investigation.
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Martins AS, Olmos D, Missiaglia E, Shipley J. Targeting the insulin-like growth factor pathway in rhabdomyosarcomas: rationale and future perspectives. Sarcoma 2011; 2011:209736. [PMID: 21437217 PMCID: PMC3061277 DOI: 10.1155/2011/209736] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 01/07/2011] [Indexed: 12/20/2022] Open
Abstract
Rhabdomyosarcomas (RMS) are a heterogeneous group of tumors that share features of skeletal myogenesis and represent the most common pediatric soft tissue sarcoma. Even though significant advances have been achieved in RMS treatment, prognosis remains very poor for many patients. Several elements of the Insulin-like Growth Factor (IGF) pathway are involved in sarcomas, including RMS. The IGF2 ligand is highly expressed in most, if not all, RMS, and frequent overexpression of the receptor IGF1R is also found. This is confirmed here through mining expression profiling data of a large series of RMS samples. IGF signaling is implicated in the genesis, growth, proliferation, and metastasis of RMS. Blockade of this pathway is therefore a potential therapeutic strategy for the treatment of RMS. In this paper we examine the biological rationale for targeting the IGF pathway in RMS as well as the current associated preclinical and clinical experience.
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Affiliation(s)
- Ana Sofia Martins
- Molecular Cytogenetics, The Institute of Cancer Research, 15 Cotswold Road Sutton, Surrey SM2 5NG, UK
| | - David Olmos
- Molecular Cytogenetics, The Institute of Cancer Research, 15 Cotswold Road Sutton, Surrey SM2 5NG, UK
- Sarcoma Unit, The Royal Marsden NHS Foundation Trust, London SW3 6JJ, UK
| | - Edoardo Missiaglia
- Molecular Cytogenetics, The Institute of Cancer Research, 15 Cotswold Road Sutton, Surrey SM2 5NG, UK
- Bioinformatics Core Facility, Swiss Institute of Bioinformatics, 1015 Laussane, Switzerland
| | - Janet Shipley
- Molecular Cytogenetics, The Institute of Cancer Research, 15 Cotswold Road Sutton, Surrey SM2 5NG, UK
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Gao J, Chesebrough JW, Cartlidge SA, Ricketts SA, Incognito L, Veldman-Jones M, Blakey DC, Tabrizi M, Jallal B, Trail PA, Coats S, Bosslet K, Chang YS. Dual IGF-I/II-neutralizing antibody MEDI-573 potently inhibits IGF signaling and tumor growth. Cancer Res 2011; 71:1029-40. [PMID: 21245093 DOI: 10.1158/0008-5472.can-10-2274] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Insulin-like growth factors (IGF), IGF-I and IGF-II, are small polypeptides involved in regulating cell proliferation, survival, differentiation, and transformation. IGF activities are mediated through binding and activation of IGF-1R or insulin receptor isoform A (IR-A). The role of the IGF-1R pathway in promoting tumor growth and survival is well documented. Overexpression of IGF-II and IR-A is reported in multiple types of cancer and is proposed as a potential mechanism for cancer cells to develop resistance to IGF-1R-targeting therapy. MEDI-573 is a fully human antibody that neutralizes both IGF-I and IGF-II and inhibits IGF signaling through both the IGF-1R and IR-A pathways. Here, we show that MEDI-573 blocks the binding of IGF-I and IGF-II to IGF-1R or IR-A, leading to the inhibition of IGF-induced signaling pathways and cell proliferation. MEDI-573 significantly inhibited the in vivo growth of IGF-I- or IGF-II-driven tumors. Pharmacodynamic analysis demonstrated inhibition of IGF-1R phosphorylation in tumors in mice dosed with MEDI-573, indicating that the antitumor activity is mediated via inhibition of IGF-1R signaling pathways. Finally, MEDI-573 significantly decreased (18)F-fluorodeoxyglucose ((18)F-FDG) uptake in IGF-driven tumor models, highlighting the potential utility of (18)F-FDG-PET as a noninvasive pharmacodynamic readout for evaluating the use of MEDI-573 in the clinic. Taken together, these results demonstrate that the inhibition of IGF-I and IGF-II ligands by MEDI-573 results in potent antitumor activity and offers an effective approach to selectively target both the IGF-1R and IR-A signaling pathways.
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Affiliation(s)
- Jin Gao
- MedImmune, Gaithersburg, Maryland 20878, USA.
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