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Zhai Y, Chavez JA, D'Aquino KE, Meng R, Nawrocki AR, Pocai A, Wang L, Ma LJ. Kynurenine 3-monooxygenase limits de novo NAD + synthesis through dietary tryptophan in renal proximal tubule epithelial cell models. Am J Physiol Cell Physiol 2024; 326:C1423-C1436. [PMID: 38497113 DOI: 10.1152/ajpcell.00445.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 02/15/2024] [Accepted: 03/13/2024] [Indexed: 03/19/2024]
Abstract
Nicotinamide adenine dinucleotide (NAD+) is a pivotal coenzyme, essential for cellular reactions, metabolism, and mitochondrial function. Depletion of kidney NAD+ levels and reduced de novo NAD+ synthesis through the tryptophan-kynurenine pathway are linked to acute kidney injury (AKI), whereas augmenting NAD+ shows promise in reducing AKI. We investigated de novo NAD+ biosynthesis using in vitro, ex vivo, and in vivo models to understand its role in AKI. Two-dimensional (2-D) cultures of human primary renal proximal tubule epithelial cells (RPTECs) and HK-2 cells showed limited de novo NAD+ synthesis, likely due to low pathway enzyme gene expression. Using three-dimensional (3-D) spheroid culture model improved the expression of tubular-specific markers and enzymes involved in de novo NAD+ synthesis. However, de novo NAD+ synthesis remained elusive in the 3-D spheroid culture, regardless of injury conditions. Further investigation revealed that 3-D cultured cells could not metabolize tryptophan (Trp) beyond kynurenine (KYN). Intriguingly, supplementation of 3-hydroxyanthranilic acid into RPTEC spheroids was readily incorporated into NAD+. In a human precision-cut kidney slice (PCKS) ex vivo model, de novo NAD+ synthesis was limited due to substantially downregulated kynurenine 3-monooxygenase (KMO), which is responsible for KYN to 3-hydroxykynurenine conversion. KMO overexpression in RPTEC 3-D spheroids successfully reinstated de novo NAD+ synthesis from Trp. In addition, in vivo study demonstrated that de novo NAD+ synthesis is intact in the kidney of the healthy adult mice. Our findings highlight disrupted tryptophan-kynurenine NAD+ synthesis in in vitro cellular models and an ex vivo kidney model, primarily attributed to KMO downregulation.NEW & NOTEWORTHY Nicotinamide adenine dinucleotide (NAD+) is essential in regulating mitochondrial function. Reduced NAD+ synthesis through the de novo pathway is associated with acute kidney injury (AKI). Our study reveals a disruption in de novo NAD+ synthesis in proximal tubular models, but not in vivo, attributed to downregulation of enzyme kynurenine 3-monooxygenase (KMO). These findings highlight a crucial role of KMO in governing de novo NAD+ biosynthesis within the kidney, shedding light on potential AKI interventions.
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Affiliation(s)
- Yougang Zhai
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Jose A Chavez
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Katharine E D'Aquino
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Rong Meng
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Andrea R Nawrocki
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Alessandro Pocai
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Lifeng Wang
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
| | - Li-Jun Ma
- CVMR-PH Discovery, Johnson & Johnson Innovative Medicine Research & Development, Spring House, Pennsylvania, United States
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Pocai A. G protein-coupled receptors and obesity. Front Endocrinol (Lausanne) 2023; 14:1301017. [PMID: 38161982 PMCID: PMC10757641 DOI: 10.3389/fendo.2023.1301017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 11/29/2023] [Indexed: 01/03/2024] Open
Abstract
G protein-coupled receptors (GPCRs) have emerged as important drug targets for various chronic diseases, including obesity and diabetes. Obesity is a complex chronic disease that requires long term management predisposing to type 2 diabetes, heart disease, and some cancers. The therapeutic landscape for GPCR as targets of anti-obesity medications has undergone significant changes with the approval of semaglutide, the first peptide glucagon like peptide 1 receptor agonist (GLP-1RA) achieving double digit weight loss (≥10%) and cardiovascular benefits. The enhanced weight loss, with the expected beneficial effect on obesity-related complications and reduction of major adverse cardiovascular events (MACE), has propelled the commercial opportunity for the obesity market leading to new players entering the space. Significant progress has been made on approaches targeting GPCRs such as single peptides that simultaneously activate GIP and/or GCGR in addition to GLP1, oral tablet formulation of GLP-1, small molecules nonpeptidic oral GLP1R and fixed-dose combination as well as add-on therapy for patients already treated with a GLP-1 agonist.
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Affiliation(s)
- Alessandro Pocai
- Cardiovascular and Metabolic Disease, Johnson & Johnson Innovative Medicine Research & Development, Spring House, PA, United States
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3
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Bakaj I, Pocai A. Metabolism-based approaches for autosomal dominant polycystic kidney disease. Front Mol Biosci 2023; 10:1126055. [PMID: 36876046 PMCID: PMC9980902 DOI: 10.3389/fmolb.2023.1126055] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 02/06/2023] [Indexed: 02/18/2023] Open
Abstract
Autosomal Dominant Polycystic Kidney Disease (ADPKD) leads to end stage kidney disease (ESKD) through the development and expansion of multiple cysts throughout the kidney parenchyma. An increase in cyclic adenosine monophosphate (cAMP) plays an important role in generating and maintaining fluid-filled cysts because cAMP activates protein kinase A (PKA) and stimulates epithelial chloride secretion through the cystic fibrosis transmembrane conductance regulator (CFTR). A vasopressin V2 receptor antagonist, Tolvaptan, was recently approved for the treatment of ADPKD patients at high risk of progression. However additional treatments are urgently needed due to the poor tolerability, the unfavorable safety profile, and the high cost of Tolvaptan. In ADPKD kidneys, alterations of multiple metabolic pathways termed metabolic reprogramming has been consistently reported to support the growth of rapidly proliferating cystic cells. Published data suggest that upregulated mTOR and c-Myc repress oxidative metabolism while enhancing glycolytic flux and lactic acid production. mTOR and c-Myc are activated by PKA/MEK/ERK signaling so it is possible that cAMPK/PKA signaling will be upstream regulators of metabolic reprogramming. Novel therapeutics opportunities targeting metabolic reprogramming may avoid or minimize the side effects that are dose limiting in the clinic and improve on the efficacy observed in human ADPKD with Tolvaptan.
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Affiliation(s)
- Ivona Bakaj
- Cardiovascular and Metabolism, Janssen Research and Development, Spring House, PA, United States
| | - Alessandro Pocai
- Cardiovascular and Metabolism, Janssen Research and Development, Spring House, PA, United States
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Steffen J, Ngo J, Wang SP, Williams K, Kramer HF, Ho G, Rodriguez C, Yekkala K, Amuzie C, Bialecki R, Norquay L, Nawrocki AR, Erion M, Pocai A, Shirihai OS, Liesa M. The mitochondrial fission protein Drp1 in liver is required to mitigate NASH and prevents the activation of the mitochondrial ISR. Mol Metab 2022; 64:101566. [PMID: 35940556 PMCID: PMC9420962 DOI: 10.1016/j.molmet.2022.101566] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 07/14/2022] [Accepted: 07/29/2022] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The mitochondrial fission protein Drp1 was proposed to promote NAFLD, as inhibition of hepatocyte Drp1 early in life prevents liver steatosis induced by high-fat diet in mice. However, whether Drp1-knockdown in older mice can reverse established NASH is unknown. METHODS N-acetylgalactosamine-siRNA conjugates, an FDA approved method to deliver siRNA selectively to hepatocytes, were used to knockdown hepatocyte-Drp1 in mice (NAG-Drp1si). NASH was induced in C57BL/6NTac mice by Gubra-Amylin-NASH diet (D09100310, 40% fat, 22% fructose and 2% cholesterol) and treatment with NAG-Drp1si was started at week 24 of diet. Circulating transaminases, liver histology, gene expression of fibrosis and inflammation markers, and hydroxyproline synthesis determined NASH severity. Liver NEFA and triglycerides were quantified by GC/MS. Mitochondrial function was determined by respirometry. Western blots of Oma1, Opa1, p-eIf2α, as well as transcriptional analyses of Atf4-regulated genes determined ISR engagement. RESULTS NAG-Drp1si treatment decreased body weight and induced liver inflammation in adult healthy mice. Increased hepatic Gdf15 production was the major contributor to body-weight loss caused by NAG-Drp1si treatment, as Gdf15 receptor deletion (Gfral KO) prevented the decrease in food intake and mitigated weight loss. NAG-Drp1si activated the Atf4-controlled integrated stress response (ISR) to increase hepatic Gdf15 expression. NAG-Drp1si in healthy mice caused ER stress and activated the mitochondrial protease Oma1, which are the ER and mitochondrial triggers that activate the Atf4-controlled ISR. Remarkably, induction of NASH was not sufficient to activate Oma1 in liver. However, NAG-Drp1si treatment was sufficient to activate Oma1 in adult mice with NASH, as well as exacerbating NASH-induced ER stress. Consequently, NAG-Drp1si treatment in mice with NASH led to higher ISR activation, exacerbated inflammation, fibrosis and necrosis. CONCLUSION Drp1 mitigates NASH by decreasing ER stress, preventing Oma1 activation and ISR exacerbation. The elevation in Gdf15 actions induced by NAG-Drp1si might represent an adaptive response decreasing the nutrient load to liver when mitochondria are misfunctional. Our study argues against blocking Drp1 in hepatocytes to combat NASH.
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Affiliation(s)
- Janos Steffen
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Jennifer Ngo
- Department of Chemistry and Biochemistry, UCLA. 607 Charles E. Young Dr., Los Angeles, CA 90095, USA; Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA. 650 Charles E. Young Dr., Los Angeles, CA 90095, USA
| | - Sheng-Ping Wang
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Kevin Williams
- Department of Chemistry and Biochemistry, UCLA. 607 Charles E. Young Dr., Los Angeles, CA 90095, USA
| | - Henning F Kramer
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - George Ho
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Carlos Rodriguez
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Krishna Yekkala
- Preclinical Safety and Translational Sciences, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Chidozie Amuzie
- Preclinical Safety and Translational Sciences, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Russell Bialecki
- Preclinical Safety and Translational Sciences, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Lisa Norquay
- Business Development, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Andrea R Nawrocki
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Mark Erion
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Alessandro Pocai
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA.
| | - Orian S Shirihai
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA. 650 Charles E. Young Dr., Los Angeles, CA 90095, USA; Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA. 650 Charles E. Young Dr., Los Angeles, CA 90095, USA.
| | - Marc Liesa
- Department of Medicine, Division of Endocrinology, David Geffen School of Medicine at UCLA. 650 Charles E. Young Dr., Los Angeles, CA 90095, USA; Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA. 650 Charles E. Young Dr., Los Angeles, CA 90095, USA; Molecular Biology Institute at UCLA, 611 Charles E. Young Drive East, Los Angeles, CA 90095-1570, USA; Institut de Biologia Molecular de Barcelona, IBMB, CSIC, Baldiri Reixac 4-8, Barcelona, Catalonia, 08028, Spain.
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Rady B, Liu J, Huang H, Bakaj I, Qi J, Lee SP, Martin T, Norquay L, Player M, Pocai A. A FFAR1 full agonist restores islet function in models of impaired glucose-stimulated insulin secretion and diabetic non-human primates. Front Endocrinol (Lausanne) 2022; 13:1061688. [PMID: 36482991 PMCID: PMC9723222 DOI: 10.3389/fendo.2022.1061688] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 10/28/2022] [Indexed: 11/23/2022] Open
Abstract
The free fatty acid receptor 1 (FFAR1/GPR40) mediates fatty acid-induced insulin secretion from pancreatic β-cells. At least 3 distinct binding sites exist on the FFAR1 receptor and numerous synthetic ligands have been investigated for their anti-diabetic actions. Fasiglifam, binds to site-1 and stimulates intra-cellular calcium release and improves glycemic control in diabetic patients. Recently, small molecule FFAR1 agonists were discovered which bind to site-3, stimulating both intra-cellular calcium and cAMP, resulting in insulin and glucagon-like peptide-1 (GLP-1) secretion. The ability of our site-3 FFAR1 agonist (compound A) to control blood glucose was evaluated in spontaneously diabetic cynomolgus monkeys during an oral glucose tolerance test. In type-2 diabetic (T2D) animals, significant reductions in blood glucose and insulin were noted. To better understand the mechanism of these in vivo findings, we evaluated the effect of compound A in islets under several conditions of dysfunction. First, healthy human and non-human primate islets were treated with compound A and showed potentiation of insulin and glucagon secretion from both species. Next, we determined glucose-responsive insulin secretion under gluco-lipotoxic conditions and from islets isolated from type-2 diabetic humans. Despite a dysfunctional phenotype that failed to secrete insulin in response to glucose, site-3 FFAR1 agonism not only enhanced insulin secretion, but restored glucose responsiveness across a range of glucose concentrations. Lastly, we treated ex vivo human islets chronically with a sulfonylurea to induce secondary beta-cell failure. Again, this model showed reduced glucose-responsive insulin secretion that was restored and potentiated by site-3 FFAR1 agonism. Together these data suggest a mechanism for FFAR1 where agonists have direct effects on islet hormone secretion that can overcome a dysfunctional T2D phenotype. These unique characteristics of FFAR1 site-3 agonists make them an appealing potential therapy to treat type-2 diabetes.
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Affiliation(s)
- Brian Rady
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
- *Correspondence: Brian Rady,
| | - Jianying Liu
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
| | - Hui Huang
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
- Discovery Chemistry, Janssen R&D, Spring House, PA, United States
| | - Ivona Bakaj
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
| | - Jenson Qi
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
| | - S. P. Lee
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
| | - Tonya Martin
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
- Medical Affairs, Janssen R&D, Spring House, PA, United States
| | - Lisa Norquay
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
- Business Development, Janssen R&D, Raritan, NJ, United States
| | - Mark Player
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
- Discovery Chemistry, Janssen R&D, Spring House, PA, United States
| | - Alessandro Pocai
- Cardiovascular and Metabolism Discovery, Janssen Research and Development, Spring House, PA, United States
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Rady B, Nishio T, Dhar D, Liu X, Erion M, Kisseleva T, Brenner DA, Pocai A. PNPLA3 downregulation exacerbates the fibrotic response in human hepatic stellate cells. PLoS One 2021; 16:e0260721. [PMID: 34879108 PMCID: PMC8654208 DOI: 10.1371/journal.pone.0260721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 11/16/2021] [Indexed: 11/20/2022] Open
Abstract
Non-alcoholic steatohepatitis (NASH) results, in part, from the interaction of metabolic derangements with predisposing genetic variants, leading to liver-related complications and mortality. The strongest genetic determinant is a highly prevalent missense variant in patatin-like phospholipase domain-containing protein 3 (PNPLA3 p.I148M). In human liver hepatocytes PNPLA3 localizes to the surface of lipid droplets where the mutant form is believed to enhance lipid accumulation and release of pro-inflammatory cytokines. Less is known about the role of PNPLA3 in hepatic stellate cells (HSCs). Here we characterized HSC obtained from patients carrying the wild type (n = 8 C/C) and the heterozygous (n = 6, C/G) or homozygous (n = 6, G/G) PNPLA3 I148M and investigated the effect of genotype and PNPLA3 downregulation on baseline and TGF-β-stimulated fibrotic gene expression. HSCs from all genotypes showed comparable baseline levels of PNPLA3 and expression of the fibrotic genes α-SMA, COL1A1, TIMP1 and SMAD7. Treatment with TGF-β increased PNPLA3 expression in all 3 genotypes (~2-fold) and resulted in similar stimulation of the expression of several fibrogenic genes. In primary human HSCs carrying wild-type (WT) PNPLA3, siRNA treatment reduced PNPLA3 mRNA by 79% resulting in increased expression of α-SMA, Col1a1, TIMP1, and SMAD7 in cells stimulated with TGF-β. Similarly, knock-down of PNPLA3 in HSCs carrying either C/G or G/G genotypes resulted in potentiation of TGF-β induced expression of fibrotic genes. Knockdown of PNPLA3 did not impact fibrotic gene expression in the absence of TGF-β treatment. Together, these data indicate that the presence of the I148M PNPLA3 mutation in HSC has no effect on baseline activation and that downregulation of PNPLA3 exacerbates the fibrotic response irrespective of the genotype.
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Affiliation(s)
- Brian Rady
- Cardiovascular & Metabolism, Janssen Pharmaceuticals, Spring House, PA, United States of America
| | - Takahiro Nishio
- Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Debanjan Dhar
- Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Xiao Liu
- Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Mark Erion
- Cardiovascular & Metabolism, Janssen Pharmaceuticals, Spring House, PA, United States of America
| | - Tatiana Kisseleva
- Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - David A. Brenner
- Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Alessandro Pocai
- Cardiovascular & Metabolism, Janssen Pharmaceuticals, Spring House, PA, United States of America
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7
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Lee SP, Qi J, Xu G, Rankin MM, Littrell J, Xu JZ, Bakaj I, Pocai A. GRK Inhibition Potentiates Glucagon-Like Peptide-1 Action. Front Endocrinol (Lausanne) 2021; 12:652628. [PMID: 34054727 PMCID: PMC8160450 DOI: 10.3389/fendo.2021.652628] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/09/2021] [Indexed: 12/11/2022] Open
Abstract
The glucagon-like peptide-1 receptor (GLP-1R) is a G-protein-coupled receptor (GPCR) whose activation results in suppression of food intake and improvement of glucose metabolism. Several receptor interacting proteins regulate the signaling of GLP-1R such as G protein-coupled receptor kinases (GRK) and β-arrestins. Here we evaluated the physiological and pharmacological impact of GRK inhibition on GLP-1R activity leveraging small molecule inhibitors of GRK2 and GRK3. We demonstrated that inhibition of GRK: i) inhibited GLP-1-mediated β-arrestin recruitment, ii) enhanced GLP-1-induced insulin secretion in isolated islets and iii) has additive effect with dipeptidyl peptidase 4 in mediating suppression of glucose excursion in mice. These findings highlight the importance of GRK to modulate GLP-1R function in vitro and in vivo. GRK inhibition is a potential therapeutic approach to enhance endogenous and pharmacologically stimulated GLP-1R signaling.
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Affiliation(s)
- Seunghun P. Lee
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
| | - Jenson Qi
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
| | - Guozhang Xu
- Discovery Sciences, Janssen Research & Development, Spring House, PA, United States
| | - Matthew M. Rankin
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
| | - James Littrell
- Discovery Sciences, Janssen Research & Development, Spring House, PA, United States
| | - June Zhi Xu
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
| | - Ivona Bakaj
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
| | - Alessandro Pocai
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, Spring House, PA, United States
- *Correspondence: Alessandro Pocai,
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Marselli L, Piron A, Suleiman M, Colli ML, Yi X, Khamis A, Carrat GR, Rutter GA, Bugliani M, Giusti L, Ronci M, Ibberson M, Turatsinze JV, Boggi U, De Simone P, De Tata V, Lopes M, Nasteska D, De Luca C, Tesi M, Bosi E, Singh P, Campani D, Schulte AM, Solimena M, Hecht P, Rady B, Bakaj I, Pocai A, Norquay L, Thorens B, Canouil M, Froguel P, Eizirik DL, Cnop M, Marchetti P. Persistent or Transient Human β Cell Dysfunction Induced by Metabolic Stress: Specific Signatures and Shared Gene Expression with Type 2 Diabetes. Cell Rep 2020; 33:108466. [PMID: 33264613 DOI: 10.1016/j.celrep.2020.108466] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 08/06/2020] [Accepted: 11/10/2020] [Indexed: 12/16/2022] Open
Abstract
Pancreatic β cell failure is key to type 2 diabetes (T2D) onset and progression. Here, we assess whether human β cell dysfunction induced by metabolic stress is reversible, evaluate the molecular pathways underlying persistent or transient damage, and explore the relationships with T2D islet traits. Twenty-six islet preparations are exposed to several lipotoxic/glucotoxic conditions, some of which impair insulin release, depending on stressor type, concentration, and combination. The reversal of dysfunction occurs after washout for some, although not all, of the lipoglucotoxic insults. Islet transcriptomes assessed by RNA sequencing and expression quantitative trait loci (eQTL) analysis identify specific pathways underlying β cell failure and recovery. Comparison of a large number of human T2D islet transcriptomes with those of persistent or reversible β cell lipoglucotoxicity show shared gene expression signatures. The identification of mechanisms associated with human β cell dysfunction and recovery and their overlap with T2D islet traits provide insights into T2D pathogenesis, fostering the development of improved β cell-targeted therapeutic strategies.
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Affiliation(s)
- Lorella Marselli
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy.
| | - Anthony Piron
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Mara Suleiman
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy
| | - Maikel L Colli
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Xiaoyan Yi
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Amna Khamis
- INSERM UMR 1283, CNRS UMR 8199, European Genomic Institute for Diabetes (EGID), Institut Pasteur de Lille, University of Lille, Lille University Hospital, Lille 59000, France
| | - Gaelle R Carrat
- Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology, and Metabolism, Imperial College, London, UK
| | - Guy A Rutter
- Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology, and Metabolism, Imperial College, London, UK; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Marco Bugliani
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy
| | - Laura Giusti
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy; School of Pharmacy, University of Camerino, Camerino, Italy
| | - Maurizio Ronci
- Department of Pharmacy, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy; Centre for Advanced Studies and Technologies (CAST), University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy
| | - Mark Ibberson
- Vital-IT Group, Swiss Institute of Bioinformatics, Lausanne 1015, Switzerland
| | | | - Ugo Boggi
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa 56126, Italy; Division of General and Transplant Surgery, Cisanello University Hospital, Pisa 56124, Italy
| | - Paolo De Simone
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa 56126, Italy; Division of Liver Surgery and Transplantation, Cisanello University Hospital, Pisa 56124, Italy
| | - Vincenzo De Tata
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa 56126, Italy
| | - Miguel Lopes
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Daniela Nasteska
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Carmela De Luca
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy
| | - Marta Tesi
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy
| | - Emanuele Bosi
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy
| | - Pratibha Singh
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium
| | - Daniela Campani
- Department of Surgical, Medical and Molecular Pathology and the Critical Areas, University of Pisa, Pisa 56126, Italy
| | - Anke M Schulte
- Sanofi-Aventis Deutschland GmbH, Diabetes Research, Frankfurt, Germany
| | - Michele Solimena
- Paul Langerhans Institute Dresden of the Helmholtz Center Munich at University Hospital Carl Gustav Carus and Faculty of Medicine, TU Dresden, Dresden 01307, Germany; German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany
| | - Peter Hecht
- Sanofi-Aventis Deutschland GmbH, Diabetes Research, Frankfurt, Germany
| | | | | | | | | | - Bernard Thorens
- Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Mickaël Canouil
- INSERM UMR 1283, CNRS UMR 8199, European Genomic Institute for Diabetes (EGID), Institut Pasteur de Lille, University of Lille, Lille University Hospital, Lille 59000, France
| | - Philippe Froguel
- Department of Metabolism, Digestion, and Reproduction, Imperial College London, London, UK
| | - Decio L Eizirik
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium; WELBIO, Université Libre de Bruxelles, Brussels, Belgium; Indiana Biosciences Research Institute, Indianapolis, IN, USA; Division of Endocrinology, ULB Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Miriam Cnop
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels 1070, Belgium; Division of Endocrinology, ULB Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium.
| | - Piero Marchetti
- Department of Clinical and Experimental Medicine, and AOUP Cisanello University Hospital, University of Pisa, Pisa 56126, Italy.
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9
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Müller TD, Finan B, Bloom SR, D'Alessio D, Drucker DJ, Flatt PR, Fritsche A, Gribble F, Grill HJ, Habener JF, Holst JJ, Langhans W, Meier JJ, Nauck MA, Perez-Tilve D, Pocai A, Reimann F, Sandoval DA, Schwartz TW, Seeley RJ, Stemmer K, Tang-Christensen M, Woods SC, DiMarchi RD, Tschöp MH. Glucagon-like peptide 1 (GLP-1). Mol Metab 2019; 30:72-130. [PMID: 31767182 PMCID: PMC6812410 DOI: 10.1016/j.molmet.2019.09.010] [Citation(s) in RCA: 769] [Impact Index Per Article: 153.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/10/2019] [Accepted: 09/22/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The glucagon-like peptide-1 (GLP-1) is a multifaceted hormone with broad pharmacological potential. Among the numerous metabolic effects of GLP-1 are the glucose-dependent stimulation of insulin secretion, decrease of gastric emptying, inhibition of food intake, increase of natriuresis and diuresis, and modulation of rodent β-cell proliferation. GLP-1 also has cardio- and neuroprotective effects, decreases inflammation and apoptosis, and has implications for learning and memory, reward behavior, and palatability. Biochemically modified for enhanced potency and sustained action, GLP-1 receptor agonists are successfully in clinical use for the treatment of type-2 diabetes, and several GLP-1-based pharmacotherapies are in clinical evaluation for the treatment of obesity. SCOPE OF REVIEW In this review, we provide a detailed overview on the multifaceted nature of GLP-1 and its pharmacology and discuss its therapeutic implications on various diseases. MAJOR CONCLUSIONS Since its discovery, GLP-1 has emerged as a pleiotropic hormone with a myriad of metabolic functions that go well beyond its classical identification as an incretin hormone. The numerous beneficial effects of GLP-1 render this hormone an interesting candidate for the development of pharmacotherapies to treat obesity, diabetes, and neurodegenerative disorders.
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Affiliation(s)
- T D Müller
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany; German Center for Diabetes Research (DZD), Neuherberg, Germany; Department of Pharmacology and Experimental Therapy, Institute of Experimental and Clinical Pharmacology and Toxicology, Eberhard Karls University Hospitals and Clinics, Tübingen, Germany.
| | - B Finan
- Novo Nordisk Research Center Indianapolis, Indianapolis, IN, USA
| | - S R Bloom
- Division of Diabetes, Endocrinology and Metabolism, Imperial College London, London, UK
| | - D D'Alessio
- Division of Endocrinology, Duke University Medical Center, Durham, NC, USA
| | - D J Drucker
- The Department of Medicine, Lunenfeld-Tanenbaum Research Institute, Mt. Sinai Hospital, University of Toronto, Ontario, M5G1X5, Canada
| | - P R Flatt
- SAAD Centre for Pharmacy & Diabetes, Ulster University, Coleraine, Northern Ireland, UK
| | - A Fritsche
- German Center for Diabetes Research (DZD), Neuherberg, Germany; Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, Tübingen, Germany; Division of Endocrinology, Diabetology, Vascular Disease, Nephrology and Clinical Chemistry, Department of Internal Medicine, University of Tübingen, Tübingen, Germany
| | - F Gribble
- Metabolic Research Laboratories and Medical Research Council Metabolic Diseases Unit, Wellcome Trust-Medical Research Council, Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - H J Grill
- Institute of Diabetes, Obesity and Metabolism, Department of Psychology, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - J F Habener
- Laboratory of Molecular Endocrinology, Massachusetts General Hospital, Harvard University, Boston, MA, USA
| | - J J Holst
- Novo Nordisk Foundation Center for Basic Metabolic Research, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - W Langhans
- Physiology and Behavior Laboratory, ETH Zurich, Schwerzenbach, Switzerland
| | - J J Meier
- Diabetes Division, St Josef Hospital, Ruhr-University Bochum, Bochum, Germany
| | - M A Nauck
- Diabetes Center Bochum-Hattingen, St Josef Hospital (Ruhr-Universität Bochum), Bochum, Germany
| | - D Perez-Tilve
- Department of Internal Medicine, University of Cincinnati-College of Medicine, Cincinnati, OH, USA
| | - A Pocai
- Cardiovascular & ImmunoMetabolism, Janssen Research & Development, Welsh and McKean Roads, Spring House, PA, 19477, USA
| | - F Reimann
- Metabolic Research Laboratories and Medical Research Council Metabolic Diseases Unit, Wellcome Trust-Medical Research Council, Institute of Metabolic Science, Addenbrooke's Hospital, University of Cambridge, Cambridge, CB2 0QQ, UK
| | - D A Sandoval
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
| | - T W Schwartz
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, DL-2200, Copenhagen, Denmark; Department of Biomedical Sciences, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - R J Seeley
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
| | - K Stemmer
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany; German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - M Tang-Christensen
- Obesity Research, Global Drug Discovery, Novo Nordisk A/S, Måløv, Denmark
| | - S C Woods
- Department of Psychiatry and Behavioral Neuroscience, University of Cincinnati, Cincinnati, OH, USA
| | - R D DiMarchi
- Novo Nordisk Research Center Indianapolis, Indianapolis, IN, USA; Department of Chemistry, Indiana University, Bloomington, IN, USA
| | - M H Tschöp
- German Center for Diabetes Research (DZD), Neuherberg, Germany; Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany; Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Neuherberg, Germany
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10
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Affiliation(s)
- Alessandro Pocai
- Cardiovascular and Metabolism, Janssen Research and Development, Spring House, Pennsylvania
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11
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Huang H, Meegalla SK, Lanter JC, Winters MP, Zhao S, Littrell J, Qi J, Rady B, Lee PS, Liu J, Martin T, Lam WW, Xu F, Lim HK, Wilde T, Silva J, Otieno M, Pocai A, Player MR. Discovery of a GPR40 Superagonist: The Impact of Aryl Propionic Acid α-Fluorination. ACS Med Chem Lett 2019; 10:16-21. [PMID: 30655940 PMCID: PMC6331191 DOI: 10.1021/acsmedchemlett.8b00444] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 12/03/2018] [Indexed: 12/11/2022] Open
Abstract
GPR40 is a G-protein-coupled receptor which mediates fatty acid-induced glucose-stimulated insulin secretion from pancreatic beta cells and incretion release from enteroendocrine cells of the small intestine. GPR40 full agonists exhibit superior glucose lowering compared to partial agonists in preclinical species due to increased insulin and GLP-1 secretion, with the added benefit of promoting weight loss. In our search for potent GPR40 full agonists, we discovered a superagonist which displayed excellent in vitro potency and superior efficacy in the Gαs-mediated signaling pathway. Most synthetic GPR40 agonists have a carboxylic acid headgroup, which may cause idiosyncratic toxicities, including drug-induced-liver-injury (DILI). With a methyl group and a fluorine atom substituted at the α-C of the carboxylic acid group, 19 is not only highly efficacious in lowering glucose and body weight in rodent models but also has a low DILI risk due to its stable acylglucuronide metabolite.
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Affiliation(s)
- Hui Huang
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Sanath K. Meegalla
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - James C. Lanter
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Michael P. Winters
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Shuyuan Zhao
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - James Littrell
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Jenson Qi
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Brian Rady
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Paul S. Lee
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Jianying Liu
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Tonya Martin
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Wing W. Lam
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Fran Xu
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Heng Keang Lim
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Thomas Wilde
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Jose Silva
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Monicah Otieno
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Alessandro Pocai
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
| | - Mark R. Player
- Departments
of Medicinal Chemistry, Cardiovascular & Metabolism in Vitro Biology, Cardiovascular &
Metabolism in Vivo Pharmacology, andPreclinical Drug Safety, Janssen Research & Development, Welsh and McKean Roads,Spring House, Pennsylvania 19477-0776, United States
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12
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Rives ML, Rady B, Swanson N, Zhao S, Qi J, Arnoult E, Bakaj I, Mancini A, Breton B, Lee SP, Player MR, Pocai A. GPR40-Mediated G α12 Activation by Allosteric Full Agonists Highly Efficacious at Potentiating Glucose-Stimulated Insulin Secretion in Human Islets. Mol Pharmacol 2018; 93:581-591. [PMID: 29572336 DOI: 10.1124/mol.117.111369] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 03/20/2018] [Indexed: 12/25/2022] Open
Abstract
GPR40 is a clinically validated molecular target for the treatment of diabetes. Many GPR40 agonists have been identified to date, with the partial agonist fasiglifam (TAK-875) reaching phase III clinical trials before its development was terminated due to off-target liver toxicity. Since then, attention has shifted toward the development of full agonists that exhibit superior efficacy in preclinical models. Full agonists bind to a distinct binding site, suggesting conformational plasticity and a potential for biased agonism. Indeed, it has been suggested that alternative pharmacology may be required for meaningful efficacy. In this study, we described the discovery and characterization of Compound A, a newly identified GPR40 allosteric full agonist highly efficacious in human islets at potentiating glucose-stimulated insulin secretion. We compared Compound A-induced GPR40 activity to that induced by both fasiglifam and AM-1638, another allosteric full agonist previously reported to be highly efficacious in preclinical models, at a panel of G proteins. Compound A was a full agonist at both the Gαq and Gαi2 pathways, and in contrast to fasiglifam Compound A also induced Gα12 coupling. Compound A and AM-1638 displayed similar activity at all pathways tested. The Gα12/Gα13-mediated signaling pathway has been linked to protein kinase D activation as well as actin remodeling, well known to contribute to the release of insulin vesicles. Our data suggest that the pharmacology of GPR40 is complex and that Gα12/Gα13-mediated signaling, which may contribute to GPR40 agonists therapeutic efficacy, is a specific property of GPR40 allosteric full agonists.
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Affiliation(s)
- Marie-Laure Rives
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Brian Rady
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Nadia Swanson
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Shuyuan Zhao
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Jenson Qi
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Eric Arnoult
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Ivona Bakaj
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Arturo Mancini
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Billy Breton
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - S Paul Lee
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Mark R Player
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
| | - Alessandro Pocai
- Molecular and Cellular Pharmacology, Janssen Research & Development, LLC, La Jolla, California (M.-L.R., N.S.); Cardiovascular and Metabolism (B.R., S.Z., J.Q., I.B., S.P.L., M.R.P., A.P.), and Computational Chemistry (E.A.), Janssen Research & Development, LLC, Spring House, Pennsylvania; and Domain Therapeutics NA Inc., Montreal, Quebec, Canada (A.M., B.B.)
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13
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Huang H, Winters MP, Meegalla SK, Arnoult E, Paul Lee S, Zhao S, Martin T, Rady B, Liu J, Towers M, Otieno M, Xu F, Lim HK, Silva J, Pocai A, Player MR. Discovery of novel benzo[b]thiophene tetrazoles as non-carboxylate GPR40 agonists. Bioorg Med Chem Lett 2018; 28:429-436. [DOI: 10.1016/j.bmcl.2017.12.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/08/2017] [Accepted: 12/12/2017] [Indexed: 01/08/2023]
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14
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Berger JP, SinhaRoy R, Pocai A, Kelly TM, Scapin G, Gao Y, Pryor KAD, Wu JK, Eiermann GJ, Xu SS, Zhang X, Tatosian DA, Weber AE, Thornberry NA, Carr RD. A comparative study of the binding properties, dipeptidyl peptidase-4 (DPP-4) inhibitory activity and glucose-lowering efficacy of the DPP-4 inhibitors alogliptin, linagliptin, saxagliptin, sitagliptin and vildagliptin in mice. Endocrinol Diabetes Metab 2018; 1:e00002. [PMID: 30815539 PMCID: PMC6360916 DOI: 10.1002/edm2.2] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 09/16/2017] [Indexed: 12/22/2022] Open
Abstract
AIMS Since 2006, DPP-4 inhibitors have become established therapy for the treatment of type 2 diabetes. Despite sharing a common mechanism of action, considerable chemical diversity exists amongst members of the DPP-4 inhibitor class, raising the question as to whether structural differences may result in differentiated enzyme inhibition and antihyperglycaemic activity. METHODS We have compared the binding properties of the most commonly used inhibitors and have investigated the relationship between their inhibitory potency at the level of the enzyme and their acute glucose-lowering efficacy. RESULTS Firstly, using a combination of published crystal structures and in-house data, we demonstrated that the binding site utilized by all of the DPP-4 inhibitors assessed was the same as that used by neuropeptide Y, supporting the hypothesis that DPP-4 inhibitors are able to competitively inhibit endogenous substrates for the enzyme. Secondly, we ascertained that the enzymatic cleft of DPP-4 is a relatively large cavity which displays conformational flexibility to accommodate structurally diverse inhibitor molecules. Finally, we found that for all inhibitors, irrespective of their chemical structure, the inhibition of plasma DPP-4 enzyme activity correlates directly with acute plasma glucose lowering in mice. CONCLUSION The common binding site utilized by different DPP-4 inhibitors enables similar competitive inhibition of the cleavage of the endogenous DPP-4 substrates. Furthermore, despite chemical diversity and a range of binding potencies observed amongst the DPP-4 inhibitors, a direct relationship between enzyme inhibition in the plasma and glucose lowering is evident in mice for each member of the classes studied.
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Affiliation(s)
- Joel P. Berger
- Merck& Co., Inc.KenilworthNJUSA
- Present address:
Takeda Pharmaceuticals International, Inc.CambridgeMAUSA
| | - Ranabir SinhaRoy
- Merck& Co., Inc.KenilworthNJUSA
- Present address:
Janssen Pharmaceuticals, Inc.TitusvilleNJUSA
| | - Alessandro Pocai
- Merck& Co., Inc.KenilworthNJUSA
- Present address:
Janssen Pharmaceuticals, Inc.TitusvilleNJUSA
| | | | | | | | | | | | | | | | | | | | - Ann E. Weber
- Merck& Co., Inc.KenilworthNJUSA
- Present address:
Kallyope Inc.New YorkNYUSA
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15
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Otieno MA, Snoeys J, Lam W, Ghosh A, Player MR, Pocai A, Salter R, Simic D, Skaggs H, Singh B, Lim HK. Fasiglifam (TAK-875): Mechanistic Investigation and Retrospective Identification of Hazards for Drug Induced Liver Injury. Toxicol Sci 2017; 163:374-384. [DOI: 10.1093/toxsci/kfx040] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Monicah A Otieno
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Jan Snoeys
- Preclinical Development & Safety, Janssen Pharmaceutica NV, Beerse, Antwerpen BE 2340, Belgium
| | - Wing Lam
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Avi Ghosh
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Mark R Player
- Cardiovascular & Metabolism, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Alessandro Pocai
- Cardiovascular & Metabolism, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Rhys Salter
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Damir Simic
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Hollie Skaggs
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Bhanu Singh
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
| | - Heng-Keang Lim
- Preclinical Development and Safety, Janssen Pharmaceuticals, Spring House, Pennsylvania 19477
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16
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Qi J, Masucci JA, Lang W, Connelly MA, Caldwell GW, Petrounia I, Kirkpatrick J, Barnakov AN, Struble G, Miller R, Dzordzorine K, Kuo GH, Gaul M, Pocai A, Lee S. Novel LC/MS/MS and High-Throughput Mass Spectrometric Assays for Monoacylglycerol Acyltransferase Inhibitors. SLAS Discov 2017; 22:433-439. [PMID: 28328322 DOI: 10.1177/2472555217690101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Monoacylglycerol acyltransferase enzymes (MGAT1, MGAT2, and MGAT3) convert monoacylglycerol to diacylglycerol (DAG). MGAT1 and MGAT2 are both implicated in obesity-related metabolic diseases. Conventional MGAT enzyme assays use radioactive substrates, wherein the product of the MGAT-catalyzed reaction is usually resolved by time-consuming thin layer chromatography (TLC) analysis. Furthermore, microsomal membrane preparations typically contain endogenous diacylglycerol acyltransferase (DGAT) from the host cells, and these DGAT activities can further acylate DAG to form triglyceride (TG). Our mass spectrometry (liquid chromatography-tandem mass spectrometry, or LC/MS/MS) MGAT2 assay measures human recombinant MGAT2-catalyzed formation of didecanoyl-glycerol from 1-decanoyl-rac-glycerol and decanoyl-CoA, to produce predominantly 1,3-didecanoyl-glycerol. Unlike 1,2-DAG, 1,3-didecanoyl-glycerol is proved to be not susceptible to further acylation to TG. 1,3-Didecanoyl-glycerol product can be readily solubilized and directly subjected to high-throughput mass spectrometry (HTMS) without further extraction in a 384-well format. We also have established the LC/MS/MS MGAT activity assay in the intestinal microsomes from various species. Our assay is proved to be highly sensitive, and thus it allows measurement of endogenous MGAT activity in cell lysates and tissue preparations. The implementation of the HTMS MGAT activity assay has facilitated the robust screening and evaluation of MGAT inhibitors for the treatment of metabolic diseases.
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Affiliation(s)
- Jenson Qi
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
| | - John A Masucci
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Wensheng Lang
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Margery A Connelly
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Gary W Caldwell
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Ioanna Petrounia
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Jennifer Kirkpatrick
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Alexander N Barnakov
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Geoffrey Struble
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Robyn Miller
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Keli Dzordzorine
- 2 Discovery Sciences, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Gee-Hong Kuo
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Michael Gaul
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Alessandro Pocai
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
| | - Seunghun Lee
- 1 Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, Spring House, PA, USA
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Qi J, Lang W, Connelly MA, Du F, Liang Y, Caldwell GW, Martin T, Hansen MK, Kuo GH, Gaul MD, Pocai A, Lee S. Metabolic tracing of monoacylglycerol acyltransferase-2 activity in vitro and in vivo. Anal Biochem 2016; 524:68-75. [PMID: 27665677 DOI: 10.1016/j.ab.2016.09.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/01/2016] [Accepted: 09/19/2016] [Indexed: 01/24/2023]
Abstract
Monoacylglycerol acyltransferase 2 (MGAT2) catalyzes the synthesis of diacylglycerol (DAG) from free fatty acids (FFA) and sn-monoacylglycerol (MG), the two major hydrolysis products of dietary fat. To demonstrate MGAT2-mediated cellular activity of triglyceride (TG) synthesis, we utilized 1-oleoyl-glycerol-d5 as a substrate to trace MGAT2-driven 1-oleoyl-glycerol-d5 incorporation into TG in HEK293 cells stably expressing human MGAT2. The oleoyl-glycerol-d5 incorporated major TG species were then quantified by liquid chromatography electrospray ionization tandem mass spectrometry (LC/ESI/MS/MS) in a 96-well format. Conventional MGAT2 target-engagement in vivo assays measure the elevation of total plasma TG by orally dosing a bolus of TG oil. We developed a novel LC/ESI/MS/MS-based fat absorption assay to assess the ability of MGAT2 inhibitors to inhibit fat absorption in CD1 mice by a meal tolerance test consisting of a mixture of liquid Boost plus® and 0.59 g/kg U13C-TG oil. The newly resynthesized plasma heavy TGs containing three 13C in the glycerol backbone and two U13C-acyl-chains, which represented the digested, absorbed and resynthesized TGs, were then quantitated by LC/ESI/MS/MS. With this assay, we identified a potent MGAT2 inhibitor that blocked MGAT2-mediated activity in vitro and in vivo. The use of 1-oleoyl-glycerol-d5 and U13C-TG oil followed by LC/ESI/MS/MS detection of stable-isotopic labeled DAG, TG, or glycerol provides a wide range of applications to study pathophysiological regulation of the monoacylglycerol pathway and MGAT2 activity.
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Affiliation(s)
- Jenson Qi
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA.
| | - Wensheng Lang
- Discovery Sciences, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Margery A Connelly
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Fuyong Du
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Yin Liang
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Gary W Caldwell
- Discovery Sciences, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Tonya Martin
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Michael K Hansen
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Gee-Hong Kuo
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Michael D Gaul
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Alessandro Pocai
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
| | - Seunghun Lee
- Cardiovascular and Metabolic Disease Research, Janssen Research & Development, LLC, 1400 McKean Road, Spring House, PA 19477-0776, USA
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18
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Zhou X, Huang CH, Lao J, Pocai A, Forrest G, Price O, Roy S, Kelley DE, Sullivan KA, Forrest MJ. Acute hemodynamic and renal effects of glucagon-like peptide 1 analog and dipeptidyl peptidase-4 inhibitor in rats. Cardiovasc Diabetol 2015; 14:29. [PMID: 25888997 PMCID: PMC4476171 DOI: 10.1186/s12933-015-0194-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 02/13/2015] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Glucagon-like peptide 1 (GLP-1) analogs and dipeptidyl peptidase-4 (DPP4) inhibitors are a newer class of antidiabetics named as incretin-based therapy. In addition to the homeostatic control of glucose, the incretin-based therapy has shown beneficial effects on the cardiovascular system in preclinical and clinical studies. However, there is limited information on their renal effects. To this end, we assessed the acute hemodynamic and renal effects of a GLP-1 analog, Liraglutide, and a DPP4 inhibitor, MK-0626. METHODS Experiments were performed in anesthetized male Sprague-Dawley rats. Three ascending doses of Liraglutide (3, 9, and 27 nmol/kg/h) or MK-0626 (1 mg/kg) with or without GLP-1 peptide (2.4, 4.8, or 9.6 pmol/kg/min) were administered. Blood pressure (BP) and heart rate (HR) were recorded from an indwelling catheter. Glomerular filtration rate (GFR) and renal blood flow (RBF) were assessed by inulin and para-aminohippurate clearance, respectively. Renal excretory function was assessed in metabolic studies. RESULTS Both Liraglutide and MK-0626 plus GLP-1 evoked significant diuretic and natriuretic responses and increased GFR. MK-0626 alone increased RBF. Liraglutide at 27 nmol//kg/h and MK-0626 plus GLP-1 at 9.6 pmol/kg/min also increased HR, whereas BP was not affected. CONCLUSION The results of the present study demonstrated that a GLP-1 analog and a DPP4 inhibitor may have beneficial effects on renal sodium and water handling. Additionally, the DPP4 inhibitor, MK-0626, favorably affects renal hemodynamics by increasing RBF. However, exceedingly high levels of GLP-1 receptor agonists may adversely affect the cardiovascular system in acute setting, as demonstrated by an acute increase in HR.
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Affiliation(s)
- Xiaoyan Zhou
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Chin-hu Huang
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Julie Lao
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Alessandro Pocai
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA. .,Janssen Research and Development, Cardiovascular and Metabolic Disease, 1516 Welsh and McKean Roads, Spring House, PA, 19477, USA.
| | - Gail Forrest
- In Vivo Pharmacology, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Olga Price
- In Vivo Pharmacology, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Sophie Roy
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - David E Kelley
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Kathleen A Sullivan
- Department of Cardiometabolic Diseases, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
| | - Michael J Forrest
- In Vivo Pharmacology, Merck Research Laboratories, 2000 Galloping Hill Road, Kenilworth, NJ, 07033, USA.
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Pocai A. Glucagon signaling in the heart: Activation or inhibition? Mol Metab 2015; 4:81-2. [PMID: 25685695 PMCID: PMC4314537 DOI: 10.1016/j.molmet.2014.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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20
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Day JW, Gelfanov V, Smiley D, Carrington PE, Eiermann G, Chicchi G, Erion MD, Gidda J, Thornberry NA, Tschöp MH, Marsh DJ, SinhaRoy R, DiMarchi R, Pocai A. Optimization of co-agonism at GLP-1 and glucagon receptors to safely maximize weight reduction in DIO-rodents. Biopolymers 2014. [PMID: 23203689 DOI: 10.1002/bip.22072] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The ratio of GLP-1/glucagon receptor (GLP1R/GCGR) co-agonism that achieves maximal weight loss without evidence of hyperglycemia was determined in diet-induced obese (DIO) mice chronically treated with GLP1R/GCGR co-agonist peptides differing in their relative receptor agonism. Using glucagon-based peptides, a spectrum of receptor selectivity was achieved by a combination of selective incorporation of GLP-1 sequences, C-terminal modification, backbone lactam stapling to stabilize helical structure, and unnatural amino acid substitutions at the N-terminal dipeptide. In addition to α-amino-isobutyric acid (Aib) substitution at position two, we show that α,α'-dimethyl imidazole acetic acid (Dmia) can serve as a potent replacement for the highly conserved histidine at position one. Selective site-specific pegylation was used to further minimize enzymatic degradation and provide uniform, extended in vivo duration of action. Maximal weight loss devoid of any sign of hyperglycemia was achieved with a co-agonist comparably balanced for in vitro potency at murine GLP1R and GCGR. This peptide exhibited superior weight loss and glucose lowering compared to a structurally matched pure GLP1R agonist, and to co-agonists of relatively reduced GCGR tone. Any further enhancement of the relative GCGR agonist potency yielded increased weight loss but at the expense of elevated blood glucose. We conclude that GCGR agonism concomitant with GLP1R agonism constitutes a promising approach to treatment of the metabolic syndrome. However, the relative ratio of GLP1R/GCGR co-agonism needs to be carefully chosen for each species to maximize weight loss efficacy and minimize hyperglycemia.
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Affiliation(s)
- Jonathan W Day
- Department of Chemistry, Indiana University, Bloomington, IN, USA
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21
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Wang W, Choi BK, Li W, Lao Z, Lee AYH, Souza SC, Yates NA, Kowalski T, Pocai A, Cohen LH. Quantification of intact and truncated stromal cell-derived factor-1α in circulation by immunoaffinity enrichment and tandem mass spectrometry. J Am Soc Mass Spectrom 2014; 25:614-625. [PMID: 24500701 DOI: 10.1007/s13361-013-0822-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 12/20/2013] [Accepted: 12/21/2013] [Indexed: 06/03/2023]
Abstract
Stromal cell-derived factor 1α (SDF-1α) or CXCL12 is a small pro-inflammatory chemoattractant cytokine and a substrate of dipeptidyl peptidase IV (DPP-IV). Proteolytic cleavage by DPP-IV inactivates SDF-1α and attenuates its interaction with CXCR4, its cell surface receptor. To enable investigation of suppression of such inactivation with pharmacologic inhibition of DPP-IV, we developed quantitative mass spectrometric methods that differentiate intact SDF-1α from its inactive form. Using top-down strategy in quantification, we demonstrated the unique advantage of keeping SDF-1α's two disulfide bridges intact in the analysis. To achieve the optimal sensitivity required for quantification of intact and truncated SDF-1α at endogenous levels in blood, we coupled nano-flow tandem mass spectrometry with antibody-based affinity enrichment. The assay has a quantitative range of 20 pmol/L to 20 nmol/L in human plasma as well as in rhesus monkey plasma. With only slight modification, the same assay can be used to quantify SDF-1α in mice. Using two in vivo animal studies as examples, we demonstrated that it was critical to differentiate intact SDF-1α from its truncated form in the analysis of biomarkers for pharmacologic inhibition of DPP-IV activity. These novel methods enable translational research on suppression of SDF-1 inactivation with DPP-IV inhibition and can be applied to relevant clinical samples in the future to yield new insights on change of SDF-1α levels in disease settings and in response to therapeutic interventions.
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Affiliation(s)
- Weixun Wang
- Pharmacokinetic Pharmacodynamics and Drug Metabolism, Merck and Co., Inc., Rahway, NJ, 07065, USA,
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22
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Abstract
Oxyntomodulin (OXM) is a peptide hormone released from the gut in post-prandial state that activates both the glucagon-like peptide-1 receptor (GLP1R) and the glucagon receptor (GCGR) resulting in superior body weight lowering to selective GLP1R agonists. OXM reduces food intake and increases energy expenditure in humans. While activation of the GCGR increases glucose production posing a hyperglycemic risk, the simultaneous activation of the GLP1R counteracts this effect. Acute OXM infusion improves glucose tolerance in T2DM patients making dual agonists of the GCGR and GLP1R new promising treatments for diabetes and obesity with the potential for weight loss and glucose lowering superior to that of GLP1R agonists.
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Affiliation(s)
- Alessandro Pocai
- Janssen Research and Devolopment, Cardiovascular and Metabolic Disease, 1516 Welsh and McKean Roads, Spring House, PA 19477, USA
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Bianchi E, Carrington PE, Ingallinella P, Finotto M, Santoprete A, Petrov A, Eiermann G, Kosinski J, Marsh DJ, Pocai A, SinhaRoy R, Pessi A. A PEGylated analog of the gut hormone oxyntomodulin with long-lasting antihyperglycemic, insulinotropic and anorexigenic activity. Bioorg Med Chem 2013; 21:7064-73. [PMID: 24094437 DOI: 10.1016/j.bmc.2013.09.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 09/04/2013] [Accepted: 09/06/2013] [Indexed: 01/31/2023]
Abstract
Peptide agonists of the glucagon-like peptide 1 (GLP-1) receptor (GLP1R) are rapidly gaining favor as antidiabetic agents, since in addition to increasing glucose-dependent insulin secretion, they also cause weight loss. Oxyntomodulin (OXM), a natural peptide with sequence homology to both glucagon and GLP-1, has glucose-lowering activity in rodents and anorectic activity in rodents and humans, but its clinical utility is limited by a short circulatory half-life due to rapid renal clearance and degradation by dipeptidyl peptidase IV (DPP-IV). Here, we describe the development of a novel DPP-IV-resistant, long-acting GLP1R agonist, based on derivatization of a suitably chosen OXM analog with high molecular weight polyethylene glycol (PEG) ('PEGylation'). PEG-OXM exerts an anti-hyperglycemic effect in diet-induced obese (DIO) mice in a glucose-dependent manner, with a maximally efficacious dose of 0.1mg/kg, and reduces food intake and body weight with a minimally efficacious dose of 1mg/kg. If this pharmacology is recapitulated in patients with type 2 diabetes, these results indicate PEG-OXM as a potential novel once-weekly GLP-1 mimetic with both glucose-lowering activity and weight loss efficacy.
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Seghieri M, Rebelos E, Gastaldelli A, Astiarraga BD, Casolaro A, Barsotti E, Pocai A, Nauck M, Muscelli E, Ferrannini E. Direct effect of GLP-1 infusion on endogenous glucose production in humans. Diabetologia 2013; 56:156-61. [PMID: 23064290 DOI: 10.1007/s00125-012-2738-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 08/29/2012] [Indexed: 01/08/2023]
Abstract
AIMS/HYPOTHESIS Glucagon-like peptide-1 (GLP-1) lowers glucose levels by potentiating glucose-induced insulin secretion and inhibiting glucagon release. The question of whether GLP-1 exerts direct effects on the liver, independently of the hormonal changes, is controversial. We tested whether an exogenous GLP-1 infusion, designed to achieve physiological postprandial levels, directly affects endogenous glucose production (EGP) under conditions mimicking the fasting state in diabetes. METHODS In 14 healthy volunteers, we applied the pancreatic clamp technique, whereby plasma insulin and glucagon levels are clamped using somatostatin and hormone replacement. The clamp was applied in paired, 4 h experiments, during which saline (control) or GLP-1(7-37)amide (0.4 pmol min⁻¹ kg⁻¹) was infused. RESULTS During the control study, plasma insulin and glucagon were maintained at basal levels and plasma C-peptide was suppressed, such that plasma glucose rose to a plateau of ~10.5 mmol/l and tracer-determined EGP increased by ~60%. During GLP-1 infusion at matched plasma glucose levels, the rise of EGP from baseline was fully prevented. Lipolysis (as indexed by NEFA concentrations and tracer-determined glycerol rate of appearance) and substrate utilisation (by indirect calorimetry) were similar between control and GLP-1 infusion. CONCLUSIONS/INTERPRETATION GLP-1 inhibits EGP under conditions where plasma insulin and glucagon are not allowed to change and glucose concentrations are matched, indicating either a direct effect on hepatocytes or neurally mediated inhibition.
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Affiliation(s)
- M Seghieri
- Department of Internal Medicine, University of Pisa School of Medicine, Via Roma, 67, 56100 Pisa, Italy
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25
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Abstract
Oxyntomodulin (OXM) is a peptide secreted from the L cells of the gut following nutrient ingestion. OXM is a dual agonist of the glucagon-like peptide-1 receptor (GLP1R) and the glucagon receptor (GCGR) combining the effects of GLP1 and glucagon to act as a potentially more effective treatment for obesity than GLP1R agonists. Injections of OXM in humans cause a significant reduction in weight and appetite, as well as an increase in energy expenditure. Activation of GCGR is classically associated with an elevation in glucose levels, which would be deleterious in patients with T2DM, but the antidiabetic properties of GLP1R agonism would be expected to counteract this effect. Indeed, OXM administration improved glucose tolerance in diet-induced obese mice. Thus, dual agonists of the GCGR and GLP1R represent a new therapeutic approach for diabetes and obesity with the potential for enhanced weight loss and improvement in glycemic control beyond those of GLP1R agonists.
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Affiliation(s)
- Alessandro Pocai
- Diabetes and Endocrinology, Merck Research Laboratories, Merck Sharp and Dohme Corp., Rahway, New Jersey 07065, USA.
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26
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Ingallinella P, Peier AM, Pocai A, Marco AD, Desai K, Zytko K, Qian Y, Du X, Cellucci A, Monteagudo E, Laufer R, Bianchi E, Marsh DJ, Pessi A. PEGylation of Neuromedin U yields a promising candidate for the treatment of obesity and diabetes. Bioorg Med Chem 2012; 20:4751-9. [DOI: 10.1016/j.bmc.2012.06.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Revised: 05/31/2012] [Accepted: 06/01/2012] [Indexed: 12/13/2022]
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Kosinski JR, Hubert J, Carrington PE, Chicchi GG, Mu J, Miller C, Cao J, Bianchi E, Pessi A, SinhaRoy R, Marsh DJ, Pocai A. The glucagon receptor is involved in mediating the body weight-lowering effects of oxyntomodulin. Obesity (Silver Spring) 2012; 20:1566-71. [PMID: 22421924 PMCID: PMC3408645 DOI: 10.1038/oby.2012.67] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Oxyntomodulin (OXM) is a peptide secreted postprandially from the L-cells of the gut that has a weak affinity for both the glucagon-like peptide-1 receptor (GLP1R) and the glucagon receptor (GCGR). Peripheral administration of OXM in humans and rodents causes weight loss reducing food intake and increasing energy expenditure. It has been suggested that OXM modulates energy intake solely through GLP1R agonism. Because glucagon decreases food intake in rodents and humans, we examined whether activation of the GCGR is involved in the body weight-lowering effects of OXM. We identified an equipotent GLP1R-selective peptide agonist that differs from OXM by only one residue (Q3→E, OXMQ3E), but has no significant GCGR agonist activity in vitro and ~100-fold reduced ability to stimulate liver glycogenolysis. Chronic treatment of obese mice with OXM and OXMQ3E demonstrated that OXM exhibits superior weight loss and lipid-lowering efficacy, and antihyperglycemic activity that is comparable to the corresponding GLP1R-selective agonist. Studies in Glp1r(-/-) mice and coadministration of OXM and a GCGR antagonist revealed that the antiobesity effect of OXM requires activation of both GLP1R and GCGR. Our data provide new insight into the mechanism of action of OXM and suggest that activation of GCGR is involved in the body weight-lowering action of OXM.
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Affiliation(s)
| | - James Hubert
- Merck Research Laboratories, Rahway, New Jersey, USA
| | | | | | - James Mu
- Merck Research Laboratories, Rahway, New Jersey, USA
| | - Corey Miller
- Merck Research Laboratories, Rahway, New Jersey, USA
| | - Jin Cao
- Merck Research Laboratories, Rahway, New Jersey, USA
| | - Elisabetta Bianchi
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Rome, Italy
- Present address: IRBM Science Park, Rome, Italy
| | - Antonello Pessi
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Rome, Italy
- Present address: PeptiPharma, Rome, Italy
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Du X, Kosinski JR, Lao J, Shen X, Petrov A, Chicchi GG, Eiermann GJ, Pocai A. Differential effects of oxyntomodulin and GLP-1 on glucose metabolism. Am J Physiol Endocrinol Metab 2012; 303:E265-71. [PMID: 22621866 DOI: 10.1152/ajpendo.00142.2012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Glucagon-like peptide-1 (GLP-1) and oxyntomodulin (OXM) are peptide hormones secreted postprandially from the gut that stimulate insulin secretion in a glucose-dependent manner. OXM activates both the GLP-1 receptor (GLP1R) and the glucagon receptor (GCGR). It has been suggested that OXM acutely modulates glucose metabolism solely through GLP1R agonism. Because OXM activates the GLP1R with lower affinity than GLP-1, we generated a peptide analog (Q→E, OXMQ3E) that does not exhibit glucagon receptor agonist activity but retains the same affinity as OXM for GLP1R. We compared the effects of OXM and OXMQ3E in a glucose tolerance test and, to better characterize the effect on glucose metabolism, we performed controlled infusions of OXM or OXMQ3E during a hyperglycemic clamp performed in wild-type, Glp1r(-/-), and Gcgr(-/-) mice. Our findings show that OXM, but not OXMQ3E, activates the GCGR in vivo. Second, OXM and OXMQ3E improve glucose tolerance following an acute glucose challenge and during a hyperglycemic clamp in mice. Finally, OXM infusion during a glucose clamp reduces the glucose infusion rate (GIR) despite a simultaneous increase in insulin levels in Glp1r(-/-) mice, whereas OXM and OXMQ3E increase GIR to a similar extent in Gcgr(-/-) mice. In conclusion, activation of the GCGR seems to partially attenuate the acute beneficial effects on glucose and contributes to the insulinotropic action of oxyntomodulin.
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Affiliation(s)
- Xiaobing Du
- In Vivo Pharmacology, Merck Sharp & Dohme Corporation, Rahway, NJ 07065, USA
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Abstract
Amino acids profoundly affect insulin action and glucose metabolism in mammals. Here, we investigated the role of the mediobasal hypothalamus (MBH), a key center involved in nutrient-dependent metabolic regulation. Specifically, we tested the novel hypothesis that the metabolism of leucine within the MBH couples the central sensing of leucine with the control of glucose production by the liver. We performed either central (MBH) or systemic infusions of leucine in Sprague-Dawley male rats during basal pancreatic insulin clamps in combination with various pharmacological and molecular interventions designed to modulate leucine metabolism in the MBH. We also examined the role of hypothalamic ATP-sensitive K(+) channels (K(ATP) channels) in the effects of leucine. Enhancing the metabolism of leucine acutely in the MBH lowered blood glucose through a biochemical network that was insensitive to rapamycin but strictly dependent on the hypothalamic metabolism of leucine to α-ketoisocaproic acid and, further, insensitive to acetyl- and malonyl-CoA. Functional K(ATP) channels were also required. Importantly, molecular attenuation of this central sensing mechanism in rats conferred susceptibility to developing hyperglycemia. We postulate that the metabolic sensing of leucine in the MBH is a previously unrecognized mechanism for the regulation of hepatic glucose production required to maintain glucose homeostasis.
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Affiliation(s)
- Ya Su
- Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York
| | - Tony K.T. Lam
- Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York
| | - Wu He
- Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York
| | - Alessandro Pocai
- Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York
| | - Joseph Bryan
- Pacific Northwest Research Institute, Seattle, Washington
| | | | - Roger Gutiérrez-Juárez
- Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York
- Corresponding author: Roger Gutiérrez-Juárez,
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Oballa RM, Belair L, Black WC, Bleasby K, Chan CC, Desroches C, Du X, Gordon R, Guay J, Guiral S, Hafey MJ, Hamelin E, Huang Z, Kennedy B, Lachance N, Landry F, Li CS, Mancini J, Normandin D, Pocai A, Powell DA, Ramtohul YK, Skorey K, Sørensen D, Sturkenboom W, Styhler A, Waddleton DM, Wang H, Wong S, Xu L, Zhang L. Development of a Liver-Targeted Stearoyl-CoA Desaturase (SCD) Inhibitor (MK-8245) to Establish a Therapeutic Window for the Treatment of Diabetes and Dyslipidemia. J Med Chem 2011; 54:5082-96. [DOI: 10.1021/jm200319u] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Peier AM, Desai K, Hubert J, Du X, Yang L, Qian Y, Kosinski JR, Metzger JM, Pocai A, Nawrocki AR, Langdon RB, Marsh DJ. Effects of peripherally administered neuromedin U on energy and glucose homeostasis. Endocrinology 2011; 152:2644-54. [PMID: 21586559 DOI: 10.1210/en.2010-1463] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Neuromedin U (NMU) is a highly conserved peptide reported to modulate energy homeostasis. Pharmacological studies have shown that centrally administered NMU inhibits food intake, reduces body weight, and increases energy expenditure. NMU-deficient mice develop obesity, whereas transgenic mice overexpressing NMU become lean and hypophagic. Two high-affinity NMU receptors, NMUR1 and NMUR2, have been identified. NMUR1 is found primarily in the periphery and NMUR2 primarily in the brain, where it mediates the anorectic effects of centrally administered NMU. Given the broad expression pattern of NMU, we evaluated whether peripheral administration of NMU has effects on energy homeostasis. We observed that acute and chronic peripheral administration of NMU in rodents dose-dependently reduced food intake and body weight and that these effects required NMUR1. The anorectic effects of NMU appeared to be partly mediated by vagal afferents. NMU treatment also increased core body temperature and metabolic rate in mice, suggesting that peripheral NMU modulates energy expenditure. Additionally, peripheral administration of NMU significantly improved glucose excursion. Collectively, these data suggest that NMU functions as a peripheral regulator of energy and glucose homeostasis and the development of NMUR1 agonists may be an effective treatment for diabetes and obesity.
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Affiliation(s)
- Andrea M Peier
- Merck Research Laboratories, Rahway, New Jersey 07065, USA.
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32
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Santoprete A, Capitò E, Carrington PE, Pocai A, Finotto M, Langella A, Ingallinella P, Zytko K, Bufali S, Cianetti S, Veneziano M, Bonelli F, Zhu L, Monteagudo E, Marsh DJ, Sinharoy R, Bianchi E, Pessi A. DPP-IV-resistant, long-acting oxyntomodulin derivatives. J Pept Sci 2011; 17:270-80. [PMID: 21294225 DOI: 10.1002/psc.1328] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 10/15/2010] [Accepted: 10/16/2010] [Indexed: 01/03/2023]
Abstract
Obesity is one of the major risk factors for type 2 diabetes, and the development of agents, that can simultaneously achieve glucose control and weight loss, is being actively pursued. Therapies based on peptide mimetics of the gut hormone glucagon-like peptide 1 (GLP-1) are rapidly gaining favor, due to their ability to increase insulin secretion in a strictly glucose-dependent manner, with little or no risk of hypoglycemia, and to their additional benefit of causing a modest, but durable weight loss. Oxyntomodulin (OXM), a 37-amino acid peptide hormone of the glucagon (GCG) family with dual agonistic activity on both the GLP-1 (GLP1R) and the GCG (GCGR) receptors, has been shown to reduce food intake and body weight in humans, with a lower incidence of treatment-associated nausea than GLP-1 mimetics. As for other peptide hormones, its clinical application is limited by the short circulatory half-life, a major component of which is cleavage by the enzyme dipeptidyl peptidase IV (DPP-IV). SAR studies on OXM, described herein, led to the identification of molecules resistant to DPP-IV degradation, with increased potency as compared to the natural hormone. Analogs derivatized with a cholesterol moiety display increased duration of action in vivo. Moreover, we identified a single substitution which can change the OXM pharmacological profile from a dual GLP1R/GCGR agonist to a selective GLP1R agonist. The latter finding enabled studies, described in detail in a separate study (Pocai A, Carrington PE, Adams JR, Wright M, Eiermann G, Zhu L, Du X, Petrov A, Lassman ME, Jiang G, Liu F, Miller C, Tota LM, Zhou G, Zhang X, Sountis MM, Santoprete A, Capitò E, Chicchi GG, Thornberry N, Bianchi E, Pessi A, Marsh DJ, SinhaRoy R. Glucagon-like peptide 1/glucagon receptor dual agonism reverses obesity in mice. Diabetes 2009; 58: 2258-2266), which highlight the potential of GLP1R/GCGR dual agonists as a potentially superior class of therapeutics over the pure GLP1R agonists currently in clinical use.
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Affiliation(s)
- Alessia Santoprete
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, 00040 Pomezia, Rome, Italy
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Pocai A, Carrington PE, Adams JR, Wright M, Eiermann G, Zhu L, Du X, Petrov A, Lassman ME, Jiang G, Liu F, Miller C, Tota LM, Zhou G, Zhang X, Sountis MM, Santoprete A, Capito' E, Chicchi GG, Thornberry N, Bianchi E, Pessi A, Marsh DJ, SinhaRoy R. Glucagon-like peptide 1/glucagon receptor dual agonism reverses obesity in mice. Diabetes 2009; 58:2258-66. [PMID: 19602537 PMCID: PMC2750209 DOI: 10.2337/db09-0278] [Citation(s) in RCA: 303] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Oxyntomodulin (OXM) is a glucagon-like peptide 1 (GLP-1) receptor (GLP1R)/glucagon receptor (GCGR) dual agonist peptide that reduces body weight in obese subjects through increased energy expenditure and decreased energy intake. The metabolic effects of OXM have been attributed primarily to GLP1R agonism. We examined whether a long acting GLP1R/GCGR dual agonist peptide exerts metabolic effects in diet-induced obese mice that are distinct from those obtained with a GLP1R-selective agonist. RESEARCH DESIGN AND METHODS We developed a protease-resistant dual GLP1R/GCGR agonist, DualAG, and a corresponding GLP1R-selective agonist, GLPAG, matched for GLP1R agonist potency and pharmacokinetics. The metabolic effects of these two peptides with respect to weight loss, caloric reduction, glucose control, and lipid lowering, were compared upon chronic dosing in diet-induced obese (DIO) mice. Acute studies in DIO mice revealed metabolic pathways that were modulated independent of weight loss. Studies in Glp1r(-/-) and Gcgr(-/-) mice enabled delineation of the contribution of GLP1R versus GCGR activation to the pharmacology of DualAG. RESULTS Peptide DualAG exhibits superior weight loss, lipid-lowering activity, and antihyperglycemic efficacy comparable to GLPAG. Improvements in plasma metabolic parameters including insulin, leptin, and adiponectin were more pronounced upon chronic treatment with DualAG than with GLPAG. Dual receptor agonism also increased fatty acid oxidation and reduced hepatic steatosis in DIO mice. The antiobesity effects of DualAG require activation of both GLP1R and GCGR. CONCLUSIONS Sustained GLP1R/GCGR dual agonism reverses obesity in DIO mice and is a novel therapeutic approach to the treatment of obesity.
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Affiliation(s)
| | | | | | | | | | - Lan Zhu
- Merck Research Laboratories, Rahway, NJ
| | | | | | | | | | | | | | | | | | | | | | - Alessia Santoprete
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Pomezia, Rome, Italy
| | - Elena Capito'
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Pomezia, Rome, Italy
| | | | | | - Elisabetta Bianchi
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Pomezia, Rome, Italy
| | - Antonello Pessi
- Istituto di Ricerche di Biologia Molecolare P. Angeletti, Pomezia, Rome, Italy
| | - Donald J. Marsh
- Merck Research Laboratories, Rahway, NJ
- Corresponding authors: Ranabir SinhaRoy, , and Donald J. Marsh,
| | - Ranabir SinhaRoy
- Merck Research Laboratories, Rahway, NJ
- Corresponding authors: Ranabir SinhaRoy, , and Donald J. Marsh,
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Ono H, Pocai A, Wang Y, Sakoda H, Asano T, Backer JM, Schwartz GJ, Rossetti L. Activation of hypothalamic S6 kinase mediates diet-induced hepatic insulin resistance in rats. J Clin Invest 2008; 118:2959-68. [PMID: 18618016 DOI: 10.1172/jci34277] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Accepted: 05/28/2008] [Indexed: 01/08/2023] Open
Abstract
Prolonged activation of p70 S6 kinase (S6K) by insulin and nutrients leads to inhibition of insulin signaling via negative feedback input to the signaling factor IRS-1. Systemic deletion of S6K protects against diet-induced obesity and enhances insulin sensitivity in mice. Herein, we present evidence suggesting that hypothalamic S6K activation is involved in the pathogenesis of diet-induced hepatic insulin resistance. Extending previous findings that insulin suppresses hepatic glucose production (HGP) partly via its effect in the hypothalamus, we report that this effect was blunted by short-term high-fat diet (HFD) feeding, with concomitant suppression of insulin signaling and activation of S6K in the mediobasal hypothalamus (MBH). Constitutive activation of S6K in the MBH mimicked the effect of the HFD in normal chow-fed animals, while suppression of S6K by overexpression of dominant-negative S6K or dominant-negative raptor in the MBH restored the ability of MBH insulin to suppress HGP after HFD feeding. These results suggest that activation of hypothalamic S6K contributes to hepatic insulin resistance in response to short-term nutrient excess.
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Affiliation(s)
- Hiraku Ono
- Department of Medicine, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York 10461, USA.
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El-Osta A, Brasacchio D, Yao D, Pocai A, Jones PL, Roeder RG, Cooper ME, Brownlee M. Transient high glucose causes persistent epigenetic changes and altered gene expression during subsequent normoglycemia. ACTA ACUST UNITED AC 2008; 205:2409-17. [PMID: 18809715 PMCID: PMC2556800 DOI: 10.1084/jem.20081188] [Citation(s) in RCA: 762] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The current goal of diabetes therapy is to reduce time-averaged mean levels of glycemia, measured as HbA1c, to prevent diabetic complications. However, HbA1c only explains <25% of the variation in risk of developing complications. Because HbA1c does not correlate with glycemic variability when adjusted for mean blood glucose, we hypothesized that transient spikes of hyperglycemia may be an HbA1c-independent risk factor for diabetic complications. We show that transient hyperglycemia induces long-lasting activating epigenetic changes in the promoter of the nuclear factor kappaB (NF-kappaB) subunit p65 in aortic endothelial cells both in vitro and in nondiabetic mice, which cause increased p65 gene expression. Both the epigenetic changes and the gene expression changes persist for at least 6 d of subsequent normal glycemia, as do NF-kappaB-induced increases in monocyte chemoattractant protein 1 and vascular cell adhesion molecule 1 expression. Hyperglycemia-induced epigenetic changes and increased p65 expression are prevented by reducing mitochondrial superoxide production or superoxide-induced alpha-oxoaldehydes. These results highlight the dramatic and long-lasting effects that short-term hyperglycemic spikes can have on vascular cells and suggest that transient spikes of hyperglycemia may be an HbA1c-independent risk factor for diabetic complications.
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Affiliation(s)
- Assam El-Osta
- Diabetes and Metabolism Division, Baker Epigenetics in Human Health and Disease, Baker IDI Heart and Diabetes Institute, Alfred Medical Research and Education Precinct, Melbourne, Victoria 3004, Australia.
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36
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Buettner C, Muse ED, Cheng A, Chen L, Scherer T, Pocai A, Su K, Cheng B, Li X, Harvey-White J, Schwartz GJ, Kunos G, Rossetti L, Buettner C. Leptin controls adipose tissue lipogenesis via central, STAT3-independent mechanisms. Nat Med 2008; 14:667-75. [PMID: 18516053 DOI: 10.1038/nm1775] [Citation(s) in RCA: 248] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Accepted: 04/18/2008] [Indexed: 12/14/2022]
Abstract
Leptin (encoded by Lep) controls body weight by regulating food intake and fuel partitioning. Obesity is characterized by leptin resistance and increased endocannabinoid tone. Here we show that leptin infused into the mediobasal hypothalamus (MBH) of rats inhibits white adipose tissue (WAT) lipogenesis, which occurs independently of signal transducer and activator of transcription-3 (STAT3) signaling. Correspondingly, transgenic inactivation of STAT3 signaling by mutation of the leptin receptor (s/s mice) leads to reduced adipose mass compared to db/db mice (complete abrogation of leptin receptor signaling). Conversely, the ability of hypothalamic leptin to suppress WAT lipogenesis in rats is lost when hypothalamic phosphoinositide 3-kinase signaling is prevented or when sympathetic denervation of adipose tissue is performed. MBH leptin suppresses the endocannabinoid anandamide in WAT, and, when this suppression of endocannabinoid tone is prevented by systemic CB1 receptor activation, MBH leptin fails to suppress WAT lipogenesis. These data suggest that the increased endocannabinoid tone observed in obesity is linked to a failure of central leptin signaling to restrain peripheral endocannabinoids.
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Affiliation(s)
- Christoph Buettner
- Department of Medicine, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1005, New York, New York 10029, USA.
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37
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Scapa EF, Pocai A, Wu MK, Gutierrez-Juarez R, Glenz L, Kanno K, Li H, Biddinger S, Jelicks LA, Rossetti L, Cohen DE. Regulation of energy substrate utilization and hepatic insulin sensitivity by phosphatidylcholine transfer protein/StarD2. FASEB J 2008; 22:2579-90. [PMID: 18347010 DOI: 10.1096/fj.07-105395] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Phosphatidylcholine transfer protein (PC-TP, also known as StarD2) is a highly specific intracellular lipid binding protein with accentuated expression in oxidative tissues. Here we show that decreased plasma concentrations of glucose and free fatty acids in fasting PC-TP-deficient (Pctp(-/-)) mice are attributable to increased hepatic insulin sensitivity. In hyperinsulinemic-euglycemic clamp studies, Pctp(-/-) mice exhibited profound reductions in hepatic glucose production, gluconeogenesis, glycogenolysis, and glucose cycling. These changes were explained in part by the lack of PC-TP expression in liver per se and in part by marked alterations in body fat composition. Reduced respiratory quotients in Pctp(-/-) mice were indicative of preferential fatty acid utilization for energy production in oxidative tissues. In the setting of decreased hepatic fatty acid synthesis, increased clearance rates of dietary triglycerides and increased hepatic triglyceride production rates reflected higher turnover in Pctp(-/-) mice. Collectively, these data support a key biological role for PC-TP in the regulation of energy substrate utilization.
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Affiliation(s)
- Erez F Scapa
- Department of Medicine, Division of Gastroenterology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA
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Novelli M, Pocai A, Chiellini C, Maffei M, Masiello P. Free fatty acids as mediators of adaptive compensatory responses to insulin resistance in dexamethasone-treated rats. Diabetes Metab Res Rev 2008; 24:155-64. [PMID: 18058844 DOI: 10.1002/dmrr.785] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Chronic low-dose dexamethasone (DEX) treatment in rats is associated to insulin resistance with compensatory hyperinsulinaemia and reduction in food intake. We tested the hypothesis that the elevation in circulating free fatty acids (FFAs) induced by DEX is the common mediator of both insulin resistance and insulin hyperproduction. METHODS For this purpose, an anti-lipolytic agent was administered during DEX treatment to lower lipacidaemia for several hours prior to glucose and insulin tolerance tests. Leptin expression in adipose tissue (by Northern blot) and plasma leptin levels (by radioimmunoassay) were also investigated to verify whether a rise in circulating leptin could be responsible for the anorectic effect of DEX. RESULTS Our data show that a transient pharmacological reduction of elevated plasma FFA levels abates the post-loading hyperinsulinaemia and counteracts the insulin resistance induced by DEX, supporting the hypothesis that the chronic elevation in FFAs is the common mediator of DEX-induced changes. Despite enhanced leptin expression in white adipose tissue, DEX-treated rats show no significant increase in plasma leptin levels. This suggests that the anorectic effect of DEX should be mediated, at least partially, by other factors, possibly related to the influence of concomitantly elevated plasma FFA and insulin levels on the hypothalamic centers regulating feeding. CONCLUSIONS Our results sustain the idea that a prolonged increase in plasma FFA levels plays an important role in the adaptive regulation of glucose and energy homeostasis, not only by potentiating insulin secretion but also by providing a signal of 'nutrient abundance' capable of restraining food intake.
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Affiliation(s)
- Michela Novelli
- Department of Experimental Pathology, University of Pisa, and Ospedale di Cisanello, Italy
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Matsumoto M, Pocai A, Rossetti L, Depinho RA, Accili D. Impaired regulation of hepatic glucose production in mice lacking the forkhead transcription factor Foxo1 in liver. Cell Metab 2007; 6:208-16. [PMID: 17767907 DOI: 10.1016/j.cmet.2007.08.006] [Citation(s) in RCA: 477] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2007] [Revised: 06/12/2007] [Accepted: 08/13/2007] [Indexed: 01/30/2023]
Abstract
The hallmark of type 2 diabetes is excessive hepatic glucose production. Several transcription factors and coactivators regulate this process in cultured cells. But gene ablation experiments have yielded few clues as to the physiologic mediators of this process in vivo. We show that inactivation of the gene encoding forkhead protein Foxo1 in mouse liver results in 40% reduction of glucose levels at birth and 30% reduction in adult mice after a 48 hr fast. Gene expression and glucose clamp studies demonstrate that Foxo1 ablation impairs fasting- and cAMP-induced glycogenolysis and gluconeogenesis. Pgc1alpha is unable to induce gluconeogenesis in Foxo1-deficient hepatocytes, while the cAMP response is significantly blunted. Conversely, Foxo1 deletion in liver curtails excessive glucose production caused by generalized ablation of insulin receptors and prevents neonatal diabetes and hepatosteatosis in insulin receptor knockout mice. The data provide a unifying mechanism for regulation of hepatic glucose production by cAMP and insulin.
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Affiliation(s)
- Michihiro Matsumoto
- Naomi Berrie Diabetes Center, Department of Medicine, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA
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Lin HV, Kim JY, Pocai A, Rossetti L, Shapiro L, Scherer PE, Accili D. Adiponectin resistance exacerbates insulin resistance in insulin receptor transgenic/knockout mice. Diabetes 2007; 56:1969-76. [PMID: 17475934 DOI: 10.2337/db07-0127] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Adiponectin increases insulin sensitivity and contributes to insulin's indirect effects on hepatic glucose production. RESEARCH DESIGN AND METHODS To examine adiponectin's contribution to insulin action, we analyzed adiponectin levels and activation of AMP-activated protein kinase (AMPK) in insulin receptor transgenic/knockout mice (L1), a genetic model of resistance to insulin's indirect effects on hepatic glucose production. RESULTS In euglycemic, insulin-resistant L1 mice, we detected hyperadiponectinemia with normal levels of adiponectin receptor-1 and -2. Moreover, adiponectin administration is unable to lower glucose levels or induce activation of AMPK, consistent with a state of adiponectin resistance. In a subset of hyperglycemic L1 mice, we observed decreased mRNA expression of AdipoR2 in liver and muscle, as well as decreased peroxisome proliferator-activated receptor (PPAR)alpha target gene expression in liver, raising the possibility that deterioration of adiponectin/AdipoR2 signaling via PPARalpha activation contributes to the progression from compensated insulin resistance to diabetes. In contrast, we failed to detect changes in other markers of the systemic or local inflammatory response. CONCLUSIONS These data provide evidence for a mechanism of adiponectin resistance and corroborate the notion that adiponectin potentiates hepatic insulin sensitivity.
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Affiliation(s)
- Hua V Lin
- Department of Medicine, Columbia University, New York, NY 10032, USA
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41
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Matias I, Vergoni AV, Petrosino S, Ottani A, Pocai A, Bertolini A, Di Marzo V. Regulation of hypothalamic endocannabinoid levels by neuropeptides and hormones involved in food intake and metabolism: insulin and melanocortins. Neuropharmacology 2007; 54:206-12. [PMID: 17675101 DOI: 10.1016/j.neuropharm.2007.06.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Revised: 06/13/2007] [Accepted: 06/13/2007] [Indexed: 11/20/2022]
Abstract
Endocannabinoids are paracrine/autocrine lipid mediators with several biological functions. One of these, i.e. the capability to stimulate food intake via cannabinoid CB(1) receptors, has been particularly studied, thus leading to the development of the first CB(1) receptor blocker, rimonabant, as a therapeutic tool against obesity and related metabolic disorders. Hypothalamic endocannabinoids stimulate appetite by regulating the expression and release of anorexic and orexigenic neuropeptides via CB(1) receptors. In turn, the tone of the latter receptors is regulated by hormones, including leptin, glucocorticoids and possibly ghrelin and neuropeptide Y, by modulating the biosynthesis of the endocannabinoids in various areas of the hypothalamus. CB(1) receptor stimulation is also known to increase blood glucose during an oral glucose tolerance test in rats. Here we investigated in the rat if insulin, which is known to exert fundamental actions at the level of the mediobasal hypothalamus (MBH), and the melanocortin system, namely alpha-melanocyte stimulating hormone (alpha-MSH) and melanocortin receptor-4 (MCR-4), also regulate hypothalamic endocannabinoid levels, measured by isotope-dilution liquid chromatography coupled to mass spectrometry. No effect on anandamide and 2-arachidonoylglycerol levels was observed after 2h infusion of insulin in the MBH, i.e. under conditions in which the hormone reduces blood glucose, nor with intra-cerebroventricular injection of alpha-MSH, under conditions in which the neuropeptide reduces food intake. Conversely, blockade of MCR-4 receptors with HS014 produced a late (6h after systemic administration) stimulatory effect on endocannabinoid levels as opposed to a rapid and prolonged stimulation of food-intake (observable 2 and 6h after administration). These data suggest that inhibition of endocannabinoid levels does not mediate the effect of insulin on hepatic glucose production nor the food intake-inhibitory effect of alpha-MSH, although stimulation of endocannabinoid levels might underlie part of the late stimulatory effects of MCR-4 blockade on food intake.
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Affiliation(s)
- Isabel Matias
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry, Consiglio Nazionale delle Ricerche, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy
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Buettner C, Muse E, Pocai A, Myers M, Rossetti L. Leptin Regulates Adipose Tissue Lipogenesis through Hypothalamic Pathways that Require Pi3K but are Independent of Stat3 Signaling. J Investig Med 2007. [DOI: 10.1177/108155890705500227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- C. Buettner
- Mount Sinai Medical Center, New York and Bronx, NY
| | - E.D. Muse
- Mount Sinai Medical Center, New York and Bronx, NY
| | - A. Pocai
- Mount Sinai Medical Center, New York and Bronx, NY
| | - M. Myers
- Mount Sinai Medical Center, New York and Bronx, NY
| | - L. Rossetti
- Mount Sinai Medical Center, New York and Bronx, NY
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Buettner C, Muse ED, Pocai A, Myers M, Rossetti L. 27 LEPTIN REGULATES ADIPOSE TISSUE LIPOGENESIS THROUGH HYPOTHALAMIC PATHWAYS THAT REQUIRE PI3K BUT ARE INDEPENDENT OF STAT3 SIGNALING. J Investig Med 2007. [DOI: 10.1136/jim-55-02-27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Lam TKT, Gutierrez-Juarez R, Pocai A, Bhanot S, Tso P, Schwartz GJ, Rossetti L. Brain glucose metabolism controls the hepatic secretion of triglyceride-rich lipoproteins. Nat Med 2007; 13:171-80. [PMID: 17273170 DOI: 10.1038/nm1540] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Accepted: 12/21/2006] [Indexed: 11/08/2022]
Abstract
Increased production of very low-density lipoprotein (VLDL) is a critical feature of the metabolic syndrome. Here we report that a selective increase in brain glucose lowered circulating triglycerides (TG) through the inhibition of TG-VLDL secretion by the liver. We found that the effect of glucose required its conversion to lactate, leading to activation of ATP-sensitive potassium channels and to decreased hepatic activity of stearoyl-CoA desaturase-1 (SCD1). SCD1 catalyzed the synthesis of oleyl-CoA from stearoyl-CoA. Curtailing the liver activity of SCD1 was sufficient to lower the hepatic levels of oleyl-CoA and to recapitulate the effects of central glucose administration on VLDL secretion. Notably, portal infusion of oleic acid restored hepatic oleyl-CoA to control levels and negated the effects of both central glucose and SCD1 deficiency on TG-VLDL secretion. These central effects of glucose (but not those of lactate) were rapidly lost in diet-induced obesity. These findings indicate that a defect in brain glucose sensing could play a critical role in the etiology of the metabolic syndrome.
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Affiliation(s)
- Tony K T Lam
- Department of Medicine, Diabetes Research Center, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA
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Gutiérrez-Juárez R, Pocai A, Mulas C, Ono H, Bhanot S, Monia BP, Rossetti L. Critical role of stearoyl-CoA desaturase-1 (SCD1) in the onset of diet-induced hepatic insulin resistance. J Clin Invest 2006; 116:1686-95. [PMID: 16741579 PMCID: PMC1464900 DOI: 10.1172/jci26991] [Citation(s) in RCA: 242] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2005] [Accepted: 04/04/2006] [Indexed: 01/02/2023] Open
Abstract
Stearoyl-CoA desaturase-1 (SCD1) catalyzes the synthesis of monounsaturated fatty acids from saturated fatty acids. Mice with a targeted disruption of Scd1 gene locus are lean and display increased insulin sensitivity. To examine whether Scd1 activity is required for the development of diet-induced hepatic insulin resistance, we used a sequence-specific antisense oligodeoxynucleotide (ASO) to lower hepatic Scd1 expression in rats and mice with diet-induced insulin resistance. Treatment of rats with Scd1 ASO markedly decreased liver Scd1 expression (approximately 80%) and total Scd activity (approximately 50%) compared with that in rats treated with scrambled ASO (control). Insulin clamp studies revealed severe hepatic insulin resistance in high-fat-fed rats and mice that was completely reversed by 5 days of treatment with Scd1 ASO. The latter treatment decreased glucose production (by approximately 75%), gluconeogenesis, and glycogenolysis. Downregulation of Scd1 also led to increased Akt phosphorylation and marked decreases in the expression of glucose-6-phosphatase (Glc-6-Pase) and phosphoenolpyruvate carboxykinase (PEPCK). Thus, Scd1 is required for the onset of diet-induced hepatic insulin resistance.
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Affiliation(s)
- Roger Gutiérrez-Juárez
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Alessandro Pocai
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Claudia Mulas
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Hiraku Ono
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Sanjay Bhanot
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Brett P. Monia
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
| | - Luciano Rossetti
- Department of Medicine, Department of Molecular Pharmacology, and Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York, USA.
ISIS Pharmaceuticals, Carlsbad, California, USA
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Buettner C, Pocai A, Muse ED, Etgen AM, Myers MG, Rossetti L. Critical role of STAT3 in leptin's metabolic actions. Cell Metab 2006; 4:49-60. [PMID: 16814732 PMCID: PMC3638026 DOI: 10.1016/j.cmet.2006.04.014] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2006] [Revised: 03/31/2006] [Accepted: 04/27/2006] [Indexed: 01/07/2023]
Abstract
Leptin has pleiotropic effects on glucose homeostasis and feeding behavior. Here, we validate the use of a cell-permeable phosphopeptide that blocks STAT3 activation in vivo. The combination of this biochemical approach with stereotaxic surgical techniques allowed us to pinpoint the contribution of hypothalamic STAT3 to the acute effects of leptin on food intake and glucose homeostasis. Leptin's ability to acutely reduce food intake critically depends on intact STAT3 signaling. Likewise, hypothalamic signaling of leptin through STAT3 is required for the acute effects of leptin on liver glucose fluxes. Lifelong obliteration of STAT3 signaling via the leptin receptor in mice (s/s mice) results in severe hepatic insulin resistance that is comparable to that observed in db/db mice, devoid of leptin receptor signaling. Our results demonstrate that the activation of the hypothalamic STAT3 pathway is an absolute requirement for the effects of leptin on food intake and hepatic glucose metabolism.
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Affiliation(s)
- Christoph Buettner
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461
- Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York 10461
| | - Alessandro Pocai
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461
- Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York 10461
| | - Evan D. Muse
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461
- Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York 10461
| | - Anne M. Etgen
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461
| | - Martin G. Myers
- Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan 48109
| | - Luciano Rossetti
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461
- Diabetes Research Center, Albert Einstein College of Medicine, Bronx, New York 10461
- Correspondence:
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Pocai A, Lam TK, Obici S, Gutierrez-Juarez R, Muse ED, Arduini A, Rossetti L. Restoration of hypothalamic lipid sensing normalizes energy and glucose homeostasis in overfed rats. J Clin Invest 2006; 116:1081-91. [PMID: 16528412 PMCID: PMC1395479 DOI: 10.1172/jci26640] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2005] [Accepted: 01/17/2006] [Indexed: 11/17/2022] Open
Abstract
Short-term overfeeding blunts the central effects of fatty acids on food intake and glucose production. This acquired defect in nutrient sensing could contribute to the rapid onset of hyperphagia and insulin resistance in this model. Here we examined whether central inhibition of lipid oxidation is sufficient to restore the hypothalamic levels of long-chain fatty acyl-CoAs (LCFA-CoAs) and to normalize food intake and glucose homeostasis in overfed rats. To this end, we targeted the liver isoform of carnitine palmitoyltransferase-1 (encoded by the CPT1A gene) by infusing either a sequence-specific ribozyme against CPT1A or an isoform-selective inhibitor of CPT1A activity in the third cerebral ventricle or in the mediobasal hypothalamus (MBH). Inhibition of CPT1A activity normalized the hypothalamic levels of LCFA-CoAs and markedly inhibited feeding behavior and hepatic glucose fluxes in overfed rats. Thus central inhibition of lipid oxidation is sufficient to restore hypothalamic lipid sensing as well as glucose and energy homeostasis in this model and may be an effective approach to the treatment of diet-induced obesity and insulin resistance.
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Affiliation(s)
- Alessandro Pocai
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Tony K.T. Lam
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Silvana Obici
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Roger Gutierrez-Juarez
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Evan D. Muse
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Arduino Arduini
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
| | - Luciano Rossetti
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, New York, New York, USA.
Iperboreal Pharma S.r.l. Via Roma, Pescara, Italy
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Abstract
Voluntary overfeeding rapidly induces resistance to the effects of systemic insulin and leptin on liver glucose metabolism. To examine whether central administration of recombinant leptin can restore leptin and insulin action on liver glucose fluxes, we infused leptin in the third cerebral ventricle of conscious overfed rats during pancreatic-insulin clamp studies. The effect of leptin on the phosphorylation of the signal transducer and activator of transcription-3 in the arcuate nuclei of the hypothalamus was similar in animals fed a regular diet or a high-fat diet for 3 days. The infusion of leptin in the third cerebral ventricle markedly inhibited glucose production in rats fed a high-fat diet mainly by decreasing glycogenolysis. The inhibition of glycogenolysis was sufficient to normalize glucose production and was accompanied by leptin-induced decreases in the hepatic expression of glucose-6-phosphatase and phosphoenolpyruvate carboxykinase. Thus central administration of leptin rescues the hepatic insulin resistance induced by short-term hyperphagia.
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Affiliation(s)
- Alessandro Pocai
- Department of Medicine, Diabetes Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Abstract
The brain keenly depends on glucose for energy, and mammalians have redundant systems to control glucose production. An increase in circulating glucose inhibits glucose production in the liver, but this negative feedback is impaired in type 2 diabetes. Here we report that a primary increase in hypothalamic glucose levels lowers blood glucose through inhibition of glucose production in rats. The effect of glucose requires its conversion to lactate followed by stimulation of pyruvate metabolism, which leads to activation of adenosine triphosphate (ATP)-sensitive potassium channels. Thus, interventions designed to enhance the hypothalamic sensing of glucose may improve glucose homeostasis in diabetes.
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Affiliation(s)
- Tony K T Lam
- Departments of Medicine and Molecular Pharmacology, Diabetes Research Center, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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