Pierre De Meyts | |
---|---|
Born | 1944 (age 79–80) Verviers, Belgium |
Education | University of Liège |
Known for | Diabetogenes |
Awards | Christophe Plantin Prize, Belgium |
Scientific career | |
Fields | Hormone-receptor interaction of peptide hormones, physiopathogenesis of diabetes |
Institutions | Hôpital de Bavière; Vrije Universiteit Brussel, Université catholique de Louvain; Beckman Research Institute, California; Hagedorn Research Institute, Copenhagen; University of Copenhagen |
Pierre De Meyts (born 1944) is a Belgian physician and biochemist known for his research on fine chemical and kinetic aspects of ligand-receptor interaction, subunit assembly, and specific metabolic (as well as mitogenic) effects of hormones typically causing receptor tyrosine kinase activation such as insulin and insulin-like growth factors (IGFs). He has also studied receptor signalling for other peptide hormones such as growth hormone and relaxin, and key pathophysiological aspects of diabetes mellitus. De Meyts held professorial posts for over three decades at several European and United States institutions and currently is an emeritus professor in the Science Faculty at the Université catholique de Louvain. [1] [2] While living in Denmark (1990-2010) he occupied executive research positions at Novo Nordisk. [3] De Meyts (a.k.a. Chuck) is also known as a science cartoonist. [4] [5]
De Meyts was born in Verviers (Belgium) in 1944. [6] He attended high school at the Athénée Royal de Verviers, where he read "Humanités Anciennes" (Latin-Mathématiques). In 1969 De Meyts received his MD with honors ("Grande Distinction") from the University of Liège Medical School, and during the subsequent three years he specialized in internal medicine at the Hôpital de Bavière. Soon after he spent three years at NIH as a visiting scientist. During this NIH period De Meyts became a prominent member of the research group led by Jesse Roth, studying insulin receptors, and authoring a dozen original papers in duly indexed journals. [7] [8] In 1976, after NIH, he returned to Belgium where he occupied academic positions at universities including the Vrije Universiteit Brussel and the International Institute of Cellular and Molecular Pathology (now called "de Duve Institute", Université catholique de Louvain). De Meyts then moved to California (1984-1990), where he joined the Beckman Research Institute of City of Hope, (Duarte) and also taught at the University of Southern California for a short period. Immediately after, De Meyts was recruited by Novo Nordisk where he successively became the director of research of the Hagedorn Research Institute (1990-2000), scientific director of its Receptor Systems Biology Laboratory (2000-2010), and corporate vice-president of the company. During this period in Denmark until 2011 De Meyts simultaneously held academic posts as adjunct professor of experimental endocrinology (2000-2005) and guest lecturer (2007-2011) at the University of Copenhagen Faculty of Health Sciences. [9] Since then De Meyts returned to his home country and founded his own consulting company in Kraainem, where he remains professionally active. [10]
De Meyts began his research career while a medical student at the University of Liège, collaborating with mentors such as Jean Lecomte and Annie Cession-Fossion in studies of the vascular actions of sympathomimetics. [11] [12] During a three-year visit to NIH starting in 1973, De Meyts got involved in what -by far- would become his major research fields: hormone-receptor interaction of peptide hormones and the study of the physiopathogenesis of diabetes. In the latter field his article with Steven G. Gray was the first to propose the possible etiological role of epigenetic factors in diabetes. [13] Also, De Meyts's articles first coined the term diabetogenes (1993), a new concept which has gained significant acceptance among independent peers in many countries (France, [14] US, [15] [16] [17] [18] Japan [19] and Denmark). [20] [21] Below is a list of De Meyts's most notable research topics and achievements:
De Meyt's most recent papers as a main author include:
De Meyts is chief specialty editor of Frontiers in Molecular and Structural Endocrinology , [46] associate editor of Frontiers in Systems Biology, [1] [47] and member of the editorial board of the Journal of Biological Chemistry . [48]
De Meyts's often iconoclastic cartoons first attained notoriety among francophone readers during the student upheavals occurring in 1968–69. [49] Many of his cartoons and posters from this period are archived and can be consulted at the Institut d’histoire ouvrière, économique et sociale in Seraing. [50] [51] [52] Once a scientist, he began drawing satirical science-cartoons. Many of these have been published in mainstream journals such as Nature , Trends in Biochemical Sciences , and Trends in Pharmacological Sciences . [5]
Insulin is a peptide hormone produced by beta cells of the pancreatic islets encoded in humans by the insulin (INS) gene. It is the main anabolic hormone of the body. It regulates the metabolism of carbohydrates, fats, and protein by promoting the absorption of glucose from the blood into cells of the liver, fat, and skeletal muscles. In these tissues the absorbed glucose is converted into either glycogen, via glycogenesis, or fats (triglycerides), via lipogenesis; in the liver, glucose is converted into both. Glucose production and secretion by the liver are strongly inhibited by high concentrations of insulin in the blood. Circulating insulin also affects the synthesis of proteins in a wide variety of tissues. It is thus an anabolic hormone, promoting the conversion of small molecules in the blood into large molecules in the cells. Low insulin in the blood has the opposite effect, promoting widespread catabolism, especially of reserve body fat.
The insulin-like growth factors (IGFs) are proteins with high sequence similarity to insulin. IGFs are part of a complex system that cells use to communicate with their physiologic environment. This complex system consists of two cell-surface receptors, two ligands, a family of seven high-affinity IGF-binding proteins, as well as associated IGFBP degrading enzymes, referred to collectively as proteases.
Insulin resistance (IR) is a pathological condition in which cells in insulin-sensitive tissues in the body fail to respond normally to the hormone insulin or downregulate insulin receptors in response to hyperinsulinemia.
The insulin receptor (IR) is a transmembrane receptor that is activated by insulin, IGF-I, IGF-II and belongs to the large class of receptor tyrosine kinase. Metabolically, the insulin receptor plays a key role in the regulation of glucose homeostasis; a functional process that under degenerate conditions may result in a range of clinical manifestations including diabetes and cancer. Insulin signalling controls access to blood glucose in body cells. When insulin falls, especially in those with high insulin sensitivity, body cells begin only to have access to lipids that do not require transport across the membrane. So, in this way, insulin is the key regulator of fat metabolism as well. Biochemically, the insulin receptor is encoded by a single gene INSR, from which alternate splicing during transcription results in either IR-A or IR-B isoforms. Downstream post-translational events of either isoform result in the formation of a proteolytically cleaved α and β subunit, which upon combination are ultimately capable of homo or hetero-dimerisation to produce the ≈320 kDa disulfide-linked transmembrane insulin receptor.
Insulin-like growth factor 1 (IGF-1), also called somatomedin C, is a hormone similar in molecular structure to insulin which plays an important role in childhood growth, and has anabolic effects in adults. In the 1950s IGF-1 was called "sulfation factor" because it stimulated sulfation of cartilage in vitro, and in the 1970s due to its effects it was termed "nonsuppressible insulin-like activity" (NSILA).
Adiponectin is a protein hormone and adipokine, which is involved in regulating glucose levels and fatty acid breakdown. In humans, it is encoded by the ADIPOQ gene and is produced primarily in adipose tissue, but also in muscle and even in the brain.
Insulin-like growth factor 2 (IGF-2) is one of three protein hormones that share structural similarity to insulin. The MeSH definition reads: "A well-characterized neutral peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like and mitogenic activities. The growth factor has a major, but not absolute, dependence on somatotropin. It is believed to be a major fetal growth factor in contrast to insulin-like growth factor 1 (IGF-1), which is a major growth factor in adults."
Fibroblast growth factor 1(FGF-1) also known as acidic fibroblast growth factor (aFGF), is a growth factor and signaling protein encoded by the FGF1 gene. It is synthesized as a 155 amino acid polypeptide, whose mature form is a non-glycosylated 17-18 kDa protein. Fibroblast growth factor protein was first purified in 1975, but soon afterwards others using different conditions isolated acidic FGF, Heparin-binding growth factor-1, and Endothelial cell growth factor-1. Gene sequencing revealed that this group was actually the same growth factor and that FGF1 was a member of a family of FGF proteins.
The insulin-like growth factor 1 (IGF-1) receptor is a protein found on the surface of human cells. It is a transmembrane receptor that is activated by a hormone called insulin-like growth factor 1 (IGF-1) and by a related hormone called IGF-2. It belongs to the large class of tyrosine kinase receptors. This receptor mediates the effects of IGF-1, which is a polypeptide protein hormone similar in molecular structure to insulin. IGF-1 plays an important role in growth and continues to have anabolic effects in adults – meaning that it can induce hypertrophy of skeletal muscle and other target tissues. Mice lacking the IGF-1 receptor die late in development, and show a dramatic reduction in body mass. This testifies to the strong growth-promoting effect of this receptor.
The glucagon receptor is a 62 kDa protein that is activated by glucagon and is a member of the class B G-protein coupled family of receptors, coupled to G alpha i, Gs and to a lesser extent G alpha q. Stimulation of the receptor results in the activation of adenylate cyclase and phospholipase C and in increased levels of the secondary messengers intracellular cAMP and calcium. In humans, the glucagon receptor is encoded by the GCGR gene.
Hormone-sensitive lipase (EC 3.1.1.79, HSL), also previously known as cholesteryl ester hydrolase (CEH), sometimes referred to as triacylglycerol lipase, is an enzyme that, in humans, is encoded by the LIPE gene, and catalyzes the following reaction:
Laron syndrome (LS), also known as growth hormone insensitivity or growth hormone receptor deficiency (GHRD), is an autosomal recessive disorder characterized by a lack of insulin-like growth factor 1 production in response to growth hormone. It is usually caused by inherited growth hormone receptor (GHR) mutations.
Tyrosine-protein kinase Lyn is a protein that in humans is encoded by the LYN gene.
Insulin receptor substrate 1(IRS-1) is a signaling adapter protein that in humans is encoded by the IRS1 gene. It is a 180 kDa protein with amino acid sequence of 1242 residues. It contains a single pleckstrin homology (PH) domain at the N-terminus and a PTB domain ca. 40 residues downstream of this, followed by a poorly conserved C-terminus tail. Together with IRS2, IRS3 (pseudogene) and IRS4, it is homologous to the Drosophila protein chico, whose disruption extends the median lifespan of flies up to 48%. Similarly, Irs1 mutant mice experience moderate life extension and delayed age-related pathologies.
Insulin-like growth factor-binding protein 3, also known as IGFBP-3, is a protein that in humans is encoded by the IGFBP3 gene. IGFBP-3 is one of six IGF binding proteins that have highly conserved structures and bind the insulin-like growth factors IGF-1 and IGF-2 with high affinity. IGFBP-7, sometimes included in this family, shares neither the conserved structural features nor the high IGF affinity. Instead, IGFBP-7 binds IGF1R, which blocks IGF-1 and IGF-2 binding, resulting in apoptosis.
Insulin receptor substrate 2 is a protein that in humans is encoded by the IRS2 gene.
Suppressor of cytokine signaling 2 is a protein that in humans is encoded by the SOCS2 gene.
Breast development, also known as mammogenesis, is a complex biological process in primates that takes place throughout a female's life.
Adipogenesis is the formation of adipocytes from stem cells. It involves 2 phases, determination, and terminal differentiation. Determination is mesenchymal stem cells committing to the adipocyte precursor cells, also known as lipoblasts or preadipocytes which lose the potential to differentiate to other types of cells such as chondrocytes, myocytes, and osteoblasts. Terminal differentiation is that preadipocytes differentiate into mature adipocytes. Adipocytes can arise either from preadipocytes resident in adipose tissue, or from bone-marrow derived progenitor cells that migrate to adipose tissue.
Derek LeRoith is a South African endocrinologist and Professor of Medicine and the current Chief of the Hilda and J. Lester Gabrilove, M.D. Division of Endocrinology, Diabetes and Bone Disease and Director of the Metabolism Institute of the Mount Sinai Medical Center in New York City. He is an international expert in insulin-like growth factor-1 (IGF-1).
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