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  1. Article ; Online: Inequitable COVID-19 vaccine distribution and the intellectual property rights prolong the pandemic.

    Altindis, Emrah

    Expert review of vaccines

    2022  Volume 21, Issue 4, Page(s) 427–430

    MeSH term(s) COVID-19/epidemiology ; COVID-19/prevention & control ; COVID-19 Vaccines ; Global Health ; Humans ; Intellectual Property ; Pandemics
    Chemical Substances COVID-19 Vaccines
    Language English
    Publishing date 2022-01-27
    Publishing country England
    Document type Editorial
    ZDB-ID 2181284-6
    ISSN 1744-8395 ; 1476-0584
    ISSN (online) 1744-8395
    ISSN 1476-0584
    DOI 10.1080/14760584.2022.2014819
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Vaccinology in the 21st century.

    Altindis, Emrah

    Current topics in medicinal chemistry

    2013  Volume 13, Issue 20, Page(s) 2533–2534

    MeSH term(s) History, 20th Century ; History, 21st Century ; Humans ; Vaccination/history ; Vaccines/history
    Chemical Substances Vaccines
    Language English
    Publishing date 2013-09-22
    Publishing country United Arab Emirates
    Document type Editorial ; Historical Article ; Introductory Journal Article
    ZDB-ID 2064823-6
    ISSN 1873-4294 ; 1568-0266
    ISSN (online) 1873-4294
    ISSN 1568-0266
    DOI 10.2174/15680266113136660179
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Vaccines for all: Institut Pasteur vaccinology course, 2010.

    Altindiş, Emrah

    Expert review of vaccines

    2010  Volume 9, Issue 9, Page(s) 1023–1026

    Abstract: A comprehensive 5-week vaccinology course was recently held in Paris (1 March-2 April 2010) hosted by the Institut Pasteur, a world-renowned center for science and vaccinology. A total of 25 young scientists from different parts of the world participated ...

    Abstract A comprehensive 5-week vaccinology course was recently held in Paris (1 March-2 April 2010) hosted by the Institut Pasteur, a world-renowned center for science and vaccinology. A total of 25 young scientists from different parts of the world participated and 63 world experts gave lectures in six specific modules that covered all aspects of vaccinology, from basic research to clinical studies. Students also had the opportunity to attend a 2-day "Pandemic Influenza Workshop". This article summarizes the issues discussed during this course and highlights the importance of global access to vaccines.
    MeSH term(s) Communicable Diseases/epidemiology ; Curriculum ; Education, Medical, Continuing ; Humans ; Paris ; Vaccination/methods ; Vaccines/immunology
    Chemical Substances Vaccines
    Language English
    Publishing date 2010-09
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2181284-6
    ISSN 1744-8395 ; 1476-0584
    ISSN (online) 1744-8395
    ISSN 1476-0584
    DOI 10.1586/erv.10.96
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Antibacterial vaccine research in 21st century: from inoculation to genomics approaches.

    Altindis, Emrah

    Current topics in medicinal chemistry

    2013  Volume 13, Issue 20, Page(s) 2638–2646

    Abstract: Vaccination is one of the safest and most cost-effective public health interventions, which save millions of lives annually. Thanks to all the genius pioneers of the field, we have already developed many effective vaccines. On the other hand, there are ... ...

    Abstract Vaccination is one of the safest and most cost-effective public health interventions, which save millions of lives annually. Thanks to all the genius pioneers of the field, we have already developed many effective vaccines. On the other hand, there are still many pathogens for which we do not yet have an effective or optimal vaccine, including malaria, HIV, and tuberculosis. In the 21(st) century, biological sciences are at the edge of a growing and fruitful genomics era, which provide many opportunities for vaccine research to have a better understanding of host-pathogen interactions, immune responses, targets and thus allow the scientists to design better vaccines. After the publication of the first bacterial genome of a pathogen, Haemophilus influenza, genomics technology revolutionized the field and created novel vaccine discovery approaches like reverse vaccinology, antigenome technology, surfome analysis, immunoproteomics, and genetics vaccinology to discover novel immunogenic antigens. This review is an attempt to briefly explain these methodologies and the history of their development since the beginning of the century.
    MeSH term(s) Bacterial Vaccines/genetics ; Bacterial Vaccines/history ; Bacterial Vaccines/immunology ; Genomics ; History, 18th Century ; History, 20th Century ; History, 21st Century ; Vaccination
    Chemical Substances Bacterial Vaccines
    Language English
    Publishing date 2013-09-22
    Publishing country United Arab Emirates
    Document type Historical Article ; Journal Article ; Review
    ZDB-ID 2064823-6
    ISSN 1873-4294 ; 1568-0266
    ISSN (online) 1873-4294
    ISSN 1568-0266
    DOI 10.2174/15680266113136660188
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Tissue differences in the exosomal/small extracellular vesicle proteome and their potential as indicators of altered tissue metabolism.

    Garcia-Martin, Ruben / Brandao, Bruna Brasil / Thomou, Thomas / Altindis, Emrah / Kahn, C Ronald

    Cell reports

    2022  Volume 38, Issue 3, Page(s) 110277

    Abstract: Exosomes/small extracellular vesicles (sEVs) can serve as multifactorial mediators of cell-to-cell communication through their miRNA and protein cargo. Quantitative proteomic analysis of five cell lines representing metabolically important tissues ... ...

    Abstract Exosomes/small extracellular vesicles (sEVs) can serve as multifactorial mediators of cell-to-cell communication through their miRNA and protein cargo. Quantitative proteomic analysis of five cell lines representing metabolically important tissues reveals that each cell type has a unique sEV proteome. While classical sEV markers such as CD9/CD63/CD81 vary markedly in abundance, we identify six sEV markers (ENO1, GPI, HSPA5, YWHAB, CSF1R, and CNTN1) that are similarly abundant in sEVs of all cell types. In addition, each cell type has specific sEV markers. Using fat-specific Dicer-knockout mice with decreased white adipose tissue and increased brown adipose tissue, we show that these cell-type-specific markers can predict the changing origin of the serum sEVs. These results provide a valuable resource for understanding the sEV proteome of the cells and tissues important in metabolic homeostasis, identify unique sEV markers, and demonstrate how these markers can help in predicting the tissue of origin of serum sEVs.
    MeSH term(s) 3T3 Cells ; Adiponectin/blood ; Adipose Tissue/metabolism ; Animals ; Biomarkers/blood ; Exosomes/metabolism ; Mice ; Proteome/metabolism
    Chemical Substances Adiponectin ; Biomarkers ; Proteome
    Language English
    Publishing date 2022-01-16
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2021.110277
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: A viral insulin-like peptide inhibits IGF-1 receptor phosphorylation and regulates IGF1R gene expression.

    Chrudinová, Martina / Kirk, Nicholas S / Chuard, Aurelien / Venugopal, Hari / Zhang, Fa / Lubos, Marta / Gelfanov, Vasily / Páníková, Terezie / Žáková, Lenka / Cutone, Julianne / Mojares, Matthew / DiMarchi, Richard / Jiráček, Jiří / Altindis, Emrah

    Molecular metabolism

    2024  Volume 80, Page(s) 101863

    Abstract: Objective: The insulin/IGF superfamily is conserved across vertebrates and invertebrates. Our team has identified five viruses containing genes encoding viral insulin/IGF-1 like peptides (VILPs) closely resembling human insulin and IGF-1. This study ... ...

    Abstract Objective: The insulin/IGF superfamily is conserved across vertebrates and invertebrates. Our team has identified five viruses containing genes encoding viral insulin/IGF-1 like peptides (VILPs) closely resembling human insulin and IGF-1. This study aims to characterize the impact of Mandarin fish ranavirus (MFRV) and Lymphocystis disease virus-Sa (LCDV-Sa) VILPs on the insulin/IGF system for the first time.
    Methods: We chemically synthesized single chain (sc, IGF-1 like) and double chain (dc, insulin like) forms of MFRV and LCDV-Sa VILPs. Using cell lines overexpressing either human insulin receptor isoform A (IR-A), isoform B (IR-B) or IGF-1 receptor (IGF1R), and AML12 murine hepatocytes, we characterized receptor binding, insulin/IGF signaling. We further characterized the VILPs' effects of proliferation and IGF1R and IR gene expression, and compared them to native ligands. Additionally, we performed insulin tolerance test in CB57BL/6 J mice to examine in vivo effects of VILPs on blood glucose levels. Finally, we employed cryo-electron microscopy (cryoEM) to analyze the structure of scMFRV-VILP in complex with the IGF1R ectodomain.
    Results: VILPs can bind to human IR and IGF1R, stimulate receptor autophosphorylation and downstream signaling pathways. Notably, scMFRV-VILP exhibited a particularly strong affinity for IGF1R, with a mere 10-fold decrease compared to human IGF-1. At high concentrations, scMFRV-VILP selectively reduced IGF-1 stimulated IGF1R autophosphorylation and Erk phosphorylation (Ras/MAPK pathway), while leaving Akt phosphorylation (PI3K/Akt pathway) unaffected, indicating a potential biased inhibitory function. Prolonged exposure to MFRV-VILP led to a significant decrease in IGF1R gene expression in IGF1R overexpressing cells and AML12 hepatocytes. Furthermore, insulin tolerance test revealed scMFRV-VILP's sustained glucose-lowering effect compared to insulin and IGF-1. Finally, cryo-EM analysis revealed that scMFRV-VILP engages with IGF1R in a manner closely resembling IGF-1 binding, resulting in a highly analogous structure.
    Conclusions: This study introduces MFRV and LCDV-Sa VILPs as novel members of the insulin/IGF superfamily. Particularly, scMFRV-VILP exhibits a biased inhibitory effect on IGF1R signaling at high concentrations, selectively inhibiting IGF-1 stimulated IGF1R autophosphorylation and Erk phosphorylation, without affecting Akt phosphorylation. In addition, MFRV-VILP specifically regulates IGF-1R gene expression and IGF1R protein levels without affecting IR. CryoEM analysis confirms that scMFRV-VILP' binding to IGF1R is mirroring the interaction pattern observed with IGF-1. These findings offer valuable insights into IGF1R action and inhibition, suggesting potential applications in development of IGF1R specific inhibitors and advancing long-lasting insulins.
    MeSH term(s) Humans ; Animals ; Mice ; Receptor, IGF Type 1/genetics ; Receptor, IGF Type 1/metabolism ; Insulin-Like Growth Factor I/genetics ; Insulin-Like Growth Factor I/metabolism ; Phosphorylation ; Proto-Oncogene Proteins c-akt/metabolism ; Phosphatidylinositol 3-Kinases/metabolism ; Cryoelectron Microscopy ; Insulin/metabolism ; Protein Isoforms/metabolism ; Gene Expression
    Chemical Substances Receptor, IGF Type 1 (EC 2.7.10.1) ; Insulin-Like Growth Factor I (67763-96-6) ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; Insulin ; Protein Isoforms ; IGF1R protein, human
    Language English
    Publishing date 2024-01-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2708735-9
    ISSN 2212-8778 ; 2212-8778
    ISSN (online) 2212-8778
    ISSN 2212-8778
    DOI 10.1016/j.molmet.2023.101863
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Viral Hormones: Expanding Dimensions in Endocrinology.

    Huang, Qian / Kahn, C Ronald / Altindis, Emrah

    Endocrinology

    2019  Volume 160, Issue 9, Page(s) 2165–2179

    Abstract: Viruses have developed different mechanisms to manipulate their hosts, including the process of viral mimicry in which viruses express important host proteins. Until recently, examples of viral mimicry were limited to mimics of growth factors and ... ...

    Abstract Viruses have developed different mechanisms to manipulate their hosts, including the process of viral mimicry in which viruses express important host proteins. Until recently, examples of viral mimicry were limited to mimics of growth factors and immunomodulatory proteins. Using a comprehensive bioinformatics approach, we have shown that viruses possess the DNA/RNA with potential to encode 16 different peptides with high sequence similarity to human peptide hormones and metabolically important regulatory proteins. We have characterized one of these families, the viral insulin/IGF-1-like peptides (VILPs), which we identified in four members of the Iridoviridae family. VILPs can bind to human insulin and IGF-1 receptors and stimulate classic postreceptor signaling pathways. Moreover, VILPs can stimulate glucose uptake in vitro and in vivo and stimulate DNA synthesis. DNA sequences of some VILP-carrying viruses have been identified in the human enteric virome. In addition to VILPs, sequences with homology to 15 other peptide hormones or cytokines can be identified in viral DNA/RNA sequences, some with a very high identity to hormones. Recent data by others has identified a peptide that resembles and mimics α-melanocyte-stimulating hormone's anti-inflammatory effects in in vitro and in vivo models. Taken together, these studies reveal novel mechanisms of viral and bacterial pathogenesis in which the microbe can directly target or mimic the host endocrine system. These findings also introduce the concept of a system of microbial hormones that provides new insights into the evolution of peptide hormones, as well as potential new roles of microbial hormones in health and disease.
    MeSH term(s) Animals ; Endocrinology ; Endothelin-1/physiology ; Fish Diseases/etiology ; Host-Pathogen Interactions/physiology ; Humans ; Insulin-Like Growth Factor I/chemistry ; Insulin-Like Growth Factor I/physiology ; Viral Proteins/chemistry ; Viral Proteins/physiology
    Chemical Substances Endothelin-1 ; Viral Proteins ; Insulin-Like Growth Factor I (67763-96-6)
    Language English
    Publishing date 2019-07-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 427856-2
    ISSN 1945-7170 ; 0013-7227
    ISSN (online) 1945-7170
    ISSN 0013-7227
    DOI 10.1210/en.2019-00271
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: A viral insulin-like peptide inhibits IGF-1 receptor phosphorylation and regulates IGF1R gene expression

    Martina Chrudinová / Nicholas S. Kirk / Aurelien Chuard / Hari Venugopal / Fa Zhang / Marta Lubos / Vasily Gelfanov / Terezie Páníková / Lenka Žáková / Julianne Cutone / Matthew Mojares / Richard DiMarchi / Jiří Jiráček / Emrah Altindis

    Molecular Metabolism, Vol 80, Iss , Pp 101863- (2024)

    2024  

    Abstract: Objective: The insulin/IGF superfamily is conserved across vertebrates and invertebrates. Our team has identified five viruses containing genes encoding viral insulin/IGF-1 like peptides (VILPs) closely resembling human insulin and IGF-1. This study aims ...

    Abstract Objective: The insulin/IGF superfamily is conserved across vertebrates and invertebrates. Our team has identified five viruses containing genes encoding viral insulin/IGF-1 like peptides (VILPs) closely resembling human insulin and IGF-1. This study aims to characterize the impact of Mandarin fish ranavirus (MFRV) and Lymphocystis disease virus-Sa (LCDV-Sa) VILPs on the insulin/IGF system for the first time. Methods: We chemically synthesized single chain (sc, IGF-1 like) and double chain (dc, insulin like) forms of MFRV and LCDV-Sa VILPs. Using cell lines overexpressing either human insulin receptor isoform A (IR-A), isoform B (IR-B) or IGF-1 receptor (IGF1R), and AML12 murine hepatocytes, we characterized receptor binding, insulin/IGF signaling. We further characterized the VILPs’ effects of proliferation and IGF1R and IR gene expression, and compared them to native ligands. Additionally, we performed insulin tolerance test in CB57BL/6 J mice to examine in vivo effects of VILPs on blood glucose levels. Finally, we employed cryo-electron microscopy (cryoEM) to analyze the structure of scMFRV-VILP in complex with the IGF1R ectodomain. Results: VILPs can bind to human IR and IGF1R, stimulate receptor autophosphorylation and downstream signaling pathways. Notably, scMFRV-VILP exhibited a particularly strong affinity for IGF1R, with a mere 10-fold decrease compared to human IGF-1. At high concentrations, scMFRV-VILP selectively reduced IGF-1 stimulated IGF1R autophosphorylation and Erk phosphorylation (Ras/MAPK pathway), while leaving Akt phosphorylation (PI3K/Akt pathway) unaffected, indicating a potential biased inhibitory function. Prolonged exposure to MFRV-VILP led to a significant decrease in IGF1R gene expression in IGF1R overexpressing cells and AML12 hepatocytes. Furthermore, insulin tolerance test revealed scMFRV-VILP's sustained glucose-lowering effect compared to insulin and IGF-1. Finally, cryo-EM analysis revealed that scMFRV-VILP engages with IGF1R in a manner closely resembling IGF-1 binding, ...
    Keywords Viral insulin/IGF-1 like peptides (VILPs) ; IGF-1 ; Insulin ; IGF1 receptor ; IGF1 receptor inhibition ; Biased signaling ; Internal medicine ; RC31-1245
    Subject code 616
    Language English
    Publishing date 2024-02-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: A viral insulin-like peptide is a natural competitive antagonist of the human IGF-1 receptor.

    Zhang, Fa / Altindis, Emrah / Kahn, C Ronald / DiMarchi, Richard D / Gelfanov, Vasily

    Molecular metabolism

    2021  Volume 53, Page(s) 101316

    Abstract: Objective: Natural sources of molecular diversity remain of utmost importance as a reservoir of proteins and peptides with unique biological functions. We recently identified such a family of viral insulin-like peptides (VILPs). We sought to advance the ...

    Abstract Objective: Natural sources of molecular diversity remain of utmost importance as a reservoir of proteins and peptides with unique biological functions. We recently identified such a family of viral insulin-like peptides (VILPs). We sought to advance the chemical methods in synthesis to explore the structure-function relationship within these VILPs, and the molecular basis for differential biological activities relative to human IGF-1 and insulin.
    Methods: Optimized chemical methods in synthesis were established for a set of VILPs and related analogs. These modified forms included the substitution of select VILP chains with those derived from human insulin and IGF-1. Each peptide was assessed in vitro for agonism and antagonism at the human insulin and the human insulin-like growth factor 1 receptor (IGF-1R).
    Results: We report here that one of these VILPs, lymphocystis disease virus-1 (LCDV1)-VILP, has the unique property to be a potent and full antagonist of the IGF-1R. We demonstrate the coordinated importance of the B- and C-chains of the VILP in regulating this activity. Moreover, mutation of the glycine following the first cysteine in the B-chain of IGF-1 to serine, in concert with substitution to the connecting peptide of LCDV1-VILP, converted native IGF-1 to a high potency antagonist.
    Conclusions: The results reveal novel aspects in ligand-receptor interactions at the IGF-1 receptor and identify a set of antagonists of potential medicinal importance.
    MeSH term(s) Humans ; Iridoviridae/chemistry ; Neuropeptides/chemistry ; Neuropeptides/pharmacology ; Receptor, IGF Type 1/antagonists & inhibitors ; Receptor, IGF Type 1/metabolism
    Chemical Substances IGF1R protein, human ; Neuropeptides ; insulin-related neuropeptide ; Receptor, IGF Type 1 (EC 2.7.10.1)
    Language English
    Publishing date 2021-08-13
    Publishing country Germany
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2708735-9
    ISSN 2212-8778 ; 2212-8778
    ISSN (online) 2212-8778
    ISSN 2212-8778
    DOI 10.1016/j.molmet.2021.101316
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Viruses and Metabolism: The Effects of Viral Infections and Viral Insulins on Host Metabolism.

    Girdhar, Khyati / Powis, Amaya / Raisingani, Amol / Chrudinová, Martina / Huang, Ruixu / Tran, Tu / Sevgi, Kaan / Dogus Dogru, Yusuf / Altindis, Emrah

    Annual review of virology

    2022  Volume 8, Issue 1, Page(s) 373–391

    Abstract: Over the past decades, there have been tremendous efforts to understand the cross-talk between viruses and host metabolism. Several studies have elucidated the mechanisms through which viral infections manipulate metabolic pathways including glucose, ... ...

    Abstract Over the past decades, there have been tremendous efforts to understand the cross-talk between viruses and host metabolism. Several studies have elucidated the mechanisms through which viral infections manipulate metabolic pathways including glucose, fatty acid, protein, and nucleotide metabolism. These pathways are evolutionarily conserved across the tree of life and extremely important for the host's nutrient utilization and energy production. In this review, we focus on host glucose, glutamine, and fatty acid metabolism and highlight the pathways manipulated by the different classes of viruses to increase their replication. We also explore a new system of viral hormones in which viruses mimic host hormones to manipulate the host endocrine system. We discuss viral insulin/IGF-1-like peptides and their potential effects on host metabolism. Together, these pathogenesis mechanisms targeting cellular signaling pathways create a multidimensional network of interactions between host and viral proteins. Defining and better understanding these mechanisms will help us to develop new therapeutic tools to prevent and treat viral infections.
    MeSH term(s) Glycolysis ; Host-Pathogen Interactions ; Humans ; Insulins/pharmacology ; Virus Diseases/drug therapy ; Virus Replication ; Viruses
    Chemical Substances Insulins
    Language English
    Publishing date 2022-02-09
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2764224-0
    ISSN 2327-0578 ; 2327-056X
    ISSN (online) 2327-0578
    ISSN 2327-056X
    DOI 10.1146/annurev-virology-091919-102416
    Database MEDical Literature Analysis and Retrieval System OnLINE

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