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Latres E, Greenbaum CJ, Oyaski ML, Dayan CM, Colhoun HM, Lachin JM, Skyler JS, Rickels MR, Ahmed ST, Dutta S, Herold KC, Marinac M. Evidence for C-peptide as a Validated Surrogate to Predict Clinical Benefits in Trials of Disease-Modifying Therapies for Type 1 Diabetes. Diabetes 2024:dbi230012. [PMID: 38349844 DOI: 10.2337/dbi23-0012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 02/15/2024]
Abstract
Type 1 diabetes is a chronic autoimmune disease in which destruction of pancreatic beta cells causes life-threatening metabolic dysregulation. Numerous approaches are envisioned for new therapies, but limitations of current clinical outcome measures are significant disincentives to development efforts. C-peptide, a direct byproduct of proinsulin processing, is a quantitative biomarker of beta cell function that is not cleared by the liver and can be measured in the peripheral blood. Studies of quantitative measures of beta cell function have established a predictive relationship between stimulated C-peptide as a measure of beta cell function and clinical benefits. C-peptide levels at diagnosis are often high enough to afford glycemic control benefits associated with protection from end-organ complications of diabetes, and even lower levels offer protection from severe hypoglycemia in type 1 diabetes, as observed in large prospective cohort studies and interventional trials of islet transplantation. These observations support consideration of C-peptide not just as a biomarker of beta cell function, but also as a specific, sensitive, feasible, and clinically meaningful outcome defining beta cell preservation or restoration for clinical trials of disease-modifying therapies. Regulatory acceptance of C-peptide as a validated surrogate for demonstration of efficacy would greatly facilitate development of disease-modifying therapies for type 1 diabetes.
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Affiliation(s)
| | | | | | | | - Helen M Colhoun
- Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, U.K
| | - John M Lachin
- The Biostatistics Center, George Washington University, Rockville, MD
| | - Jay S Skyler
- Diabetes Research Institute, University of Miami, Miami, FL
| | - Michael R Rickels
- Institute for Diabetes, Obesity and Metabolism, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Simi T Ahmed
- The New York Stem Cell Foundation Research Institute, New York, NY
| | | | - Kevan C Herold
- Departments of Immunobiology and Internal Medicine, Yale School of Medicine, New Haven, CT
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Taylor PN, Collins KS, Lam A, Karpen SR, Greeno B, Walker F, Lozano A, Atabakhsh E, Ahmed ST, Marinac M, Latres E, Senior PA, Rigby M, Gottlieb PA, Dayan CM. C-peptide and metabolic outcomes in trials of disease modifying therapy in new-onset type 1 diabetes: an individual participant meta-analysis. Lancet Diabetes Endocrinol 2023; 11:915-925. [PMID: 37931637 DOI: 10.1016/s2213-8587(23)00267-x] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 09/08/2023] [Accepted: 09/12/2023] [Indexed: 11/08/2023]
Abstract
BACKGROUND Metabolic outcomes in type 1 diabetes remain suboptimal. Disease modifying therapy to prevent β-cell loss presents an alternative treatment framework but the effect on metabolic outcomes is unclear. We, therefore, aimed to define the relationship between insulin C-peptide as a marker of β-cell function and metabolic outcomes in new-onset type 1 diabetes. METHODS 21 trials of disease-modifying interventions within 100 days of type 1 diabetes diagnosis comprising 1315 adults (ie, those 18 years and older) and 1396 children (ie, those younger than 18 years) were combined. Endpoints assessed were stimulated area under the curve C-peptide, HbA1c, insulin use, hypoglycaemic events, and composite scores (such as insulin dose adjusted A1c, total daily insulin, U/kg per day, and BETA-2 score). Positive studies were defined as those meeting their primary endpoint. Differences in outcomes between active and control groups were assessed using the Wilcoxon rank test. FINDINGS 6 months after treatment, a 24·8% greater C-peptide preservation in positive studies was associated with a 0·55% lower HbA1c (p<0·0001), with differences being detectable as early as 3 months. Cross-sectional analysis, combining positive and negative studies, was consistent with this proportionality: a 55% improvement in C-peptide preservation was associated with 0·64% lower HbA1c (p<0·0001). Higher initial C-peptide levels and greater preservation were associated with greater improvement in HbA1c. For HbA1c, IDAAC, and BETA-2 score, sample size predictions indicated that 2-3 times as many participants per group would be required to show a difference at 6 months as compared with C-peptide. Detecting a reduction in hypoglycaemia was affected by reporting methods. INTERPRETATION Interventions that preserve β-cell function are effective at improving metabolic outcomes in new-onset type 1 diabetes, confirming their potential as adjuncts to insulin. We have shown that improvements in HbA1c are directly proportional to the degree of C-peptide preservation, quantifying this relationship, and supporting the use of C-peptides as a surrogate endpoint in clinical trials. FUNDING JDRF and Diabetes UK.
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Affiliation(s)
- Peter N Taylor
- Department of Infection and Immunity, Cardiff University School of Medicine, Cardiff University, Cardiff, UK
| | | | - Anna Lam
- Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | | | | | | | | | | | - Simi T Ahmed
- The New York Stem Cell Foundation Research Institute, New York, NY, USA
| | | | | | - Peter A Senior
- Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | - Mark Rigby
- Critical Path Institute, Tucson, AZ, USA
| | | | - Colin M Dayan
- Department of Infection and Immunity, Cardiff University School of Medicine, Cardiff University, Cardiff, UK.
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3
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Cantley J, Eizirik DL, Latres E, Dayan CM. Islet cells in human type 1 diabetes: from recent advances to novel therapies - a symposium-based roadmap for future research. J Endocrinol 2023; 259:e230082. [PMID: 37493471 PMCID: PMC10502961 DOI: 10.1530/joe-23-0082] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 07/25/2023] [Indexed: 07/27/2023]
Abstract
There is a growing understanding that the early phases of type 1 diabetes (T1D) are characterised by a deleterious dialogue between the pancreatic beta cells and the immune system. This, combined with the urgent need to better translate this growing knowledge into novel therapies, provided the background for the JDRF-DiabetesUK-INNODIA-nPOD symposium entitled 'Islet cells in human T1D: from recent advances to novel therapies', which took place in Stockholm, Sweden, in September 2022. We provide in this article an overview of the main themes addressed in the symposium, pointing to both promising conclusions and key unmet needs that remain to be addressed in order to achieve better approaches to prevent or reverse T1D.
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Affiliation(s)
- J Cantley
- School of Medicine, University of Dundee, Dundee, United Kingdom of Great Britain and Northern Ireland
| | - D L Eizirik
- ULB Center for Diabetes Research, Université Libre de Bruxelles Faculté de Médecine, Bruxelles, Belgium
| | - E Latres
- JDRF International, New York, NY, USA
| | - C M Dayan
- Cardiff University School of Medicine, Cardiff, United Kingdom of Great Britain and Northern Ireland
| | - the JDRF-DiabetesUK-INNODIA-nPOD Stockholm Symposium 2022
- School of Medicine, University of Dundee, Dundee, United Kingdom of Great Britain and Northern Ireland
- ULB Center for Diabetes Research, Université Libre de Bruxelles Faculté de Médecine, Bruxelles, Belgium
- JDRF International, New York, NY, USA
- Cardiff University School of Medicine, Cardiff, United Kingdom of Great Britain and Northern Ireland
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Gurlin RE, Giraldo JA, Latres E. 3D Bioprinting and Translation of Beta Cell Replacement Therapies for Type 1 Diabetes. Tissue Eng Part B Rev 2020; 27:238-252. [PMID: 32907514 DOI: 10.1089/ten.teb.2020.0192] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Type 1 diabetes (T1D) is an autoimmune disorder in which the body's own immune system selectively attacks beta cells within pancreatic islets resulting in insufficient insulin production and loss of the ability to regulate blood glucose (BG) levels. Currently, the standard of care consists of BG level monitoring and insulin administration, which are essential to avoid the consequences of dysglycemia and long-term complications. Although recent advances in continuous glucose monitoring and automated insulin delivery systems have resulted in improved clinical outcomes for users, nearly 80% of people with T1D fail to achieve their target hemoglobin A1c (HbA1c) levels defined by the American Diabetes Association. Intraportal islet transplantation into immunosuppressed individuals with T1D suffering from impaired awareness of hypoglycemia has resulted in lower HbA1c, elimination of severe hypoglycemic events, and insulin independence, demonstrating the unique potential of beta cell replacement therapy (BCRT) in providing optimal glycemic control and a functional cure for T1D. BCRTs need to maximize cell engraftment, long-term survival, and function in the absence of immunosuppression to provide meaningful clinical outcomes to all people living with T1D. One innovative technology that could enable widespread translation of this approach into the clinic is three-dimensional (3D) bioprinting. Herein, we review how bioprinting could facilitate translation of BCRTs as well as the current and forthcoming techniques used for bioprinting of a BCRT product. We discuss the strengths and weaknesses of 3D bioprinting in this context in addition to the road ahead for the development of BCRTs. Impact statement Significant research developments in beta cell replacement therapies show its promise in providing a functional cure for type 1 diabetes (T1D); yet, their widespread clinical use has been difficult to achieve. This review provides a brief overview of the requirements for a beta cell replacement product followed by a discussion on both the promise and limitations of three-dimensional bioprinting in facilitating the fabrication of such products to enable translation into the clinic. Advancements in this area could be a key component to unlocking the safety and effectiveness of beta cell therapy for T1D.
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Affiliation(s)
- Rachel E Gurlin
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, California, USA
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5
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Rickels MR, Stock PG, de Koning EJP, Piemonti L, Pratschke J, Alejandro R, Bellin MD, Berney T, Choudhary P, Johnson PR, Kandaswamy R, Kay TWH, Keymeulen B, Kudva YC, Latres E, Langer RM, Lehmann R, Ludwig B, Markmann JF, Marinac M, Odorico JS, Pattou F, Senior PA, Shaw JAM, Vantyghem MC, White S. Defining outcomes for β-cell replacement therapy in the treatment of diabetes: a consensus report on the Igls criteria from the IPITA/EPITA opinion leaders workshop. Transpl Int 2018; 31:343-352. [PMID: 29453879 DOI: 10.1111/tri.13138] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [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: 12/03/2017] [Revised: 01/09/2018] [Accepted: 02/12/2018] [Indexed: 12/12/2022]
Abstract
β-cell replacement therapy, available currently as pancreas or islet transplantation, has developed without a clear definition of graft functional and clinical outcomes. The International Pancreas & Islet Transplant Association (IPITA) and European Pancreas & Islet Transplantation Association (EPITA) held a workshop to develop consensus for an IPITA/EPITA Statement on the definition of function and failure of current and future forms of β-cell replacement therapy. There was consensus that β-cell replacement therapy could be considered as a treatment for β-cell failure, regardless of etiology and without requiring undetectable C-peptide, accompanied by glycemic instability with either problematic hypoglycemia or hyperglycemia. Glycemic control should be assessed at a minimum by glycated hemoglobin (HbA1c ) and the occurrence of severe hypoglycemia. Optimal β-cell graft function is defined by near-normal glycemic control [HbA1c ≤ 6.5% (48 mmol/mol)] without severe hypoglycemia or requirement for insulin or other antihyperglycemic therapy, and with an increase over pretransplant measurement of C-peptide. Good β-cell graft function requires HbA1c < 7.0% (53 mmol/mol) without severe hypoglycemia and with a significant (>50%) reduction in insulin requirements and restoration of clinically significant C-peptide production. Marginal β-cell graft function is defined by failure to achieve HbA1c < 7.0% (53 mmol/mol), the occurrence of any severe hypoglycemia, or less than 50% reduction in insulin requirements when there is restoration of clinically significant C-peptide production documented by improvement in hypoglycemia awareness/severity, or glycemic variability/lability. A failed β-cell graft is defined by the absence of any evidence for clinically significant C-peptide production. Optimal and good functional outcomes are considered successful clinical outcomes.
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Affiliation(s)
- Michael R Rickels
- Department of Medicine, Division of Endocrinology, Diabetes & Metabolism, Institute for Diabetes, Obesity & Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Peter G Stock
- Department of Surgery, Division of Transplantation, University of California at San Francisco, San Francisco, CA, USA
| | - Eelco J P de Koning
- Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Lorenzo Piemonti
- Diabetes Research Institute, San Raffaele Scientific Institute, Milan, Italy
| | | | - Rodolfo Alejandro
- Department of Medicine, Division of Endocrinology, Diabetes & Metabolism, Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Melena D Bellin
- Department of Pediatrics, Division of Endocrinology, Schulze Diabetes Institute, University of Minnesota, Minneapolis, MN, USA
| | - Thierry Berney
- Department of Surgery, Division of Transplantation and Visceral Surgery, Geneva University Hospital, Geneva, Switzerland
| | | | - Paul R Johnson
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Raja Kandaswamy
- Department of Surgery, Division of Transplantation, Schulze Diabetes Institute, University of Minnesota, Minneapolis, MN, USA
| | - Thomas W H Kay
- Department of Medicine, St. Vincent's Hospital, St. Vincent's Institute of Medical Research, University of Melbourne, Melbourne, Vic., Australia
| | - Bart Keymeulen
- Diabetes Research Center, Vrije Universiteit Brussel, Brussels, Belgium
| | - Yogish C Kudva
- Department of Internal Medicine, Division of Endocrinology, Diabetes, Metabolism & Nutrition, Mayo Clinic, Rochester, MN, USA
| | | | | | - Roger Lehmann
- Department of Endocrinology and Diabetology, University Hospital Zurich, Zurich, Switzerland
| | - Barbara Ludwig
- Department of Medicine III, Division of Endocrinology and Diabetes, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
| | - James F Markmann
- Department of Surgery, Division of Transplantation, Massachusetts General Hospital, Boston, MA, USA
| | | | - Jon S Odorico
- Department of Surgery, Division of Transplantation, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - François Pattou
- Department of General and Endocrine Surgery, Centre Hospitalier Universitaire de Lille, Inserm, Université de Lille, Lille, France
| | - Peter A Senior
- Department of Medicine, Division of Endocrinology & Metabolism, University of Alberta, Edmonton, AB, Canada
| | - James A M Shaw
- Institute of Transplantation, The Freeman Hospital, Newcastle University, Newcastle upon Tyne, UK
| | - Marie-Christine Vantyghem
- Department of Endocrinology, Diabetology and Metabolism, Centre Hospitalier Universitaire de Lille, Inserm, Université de Lille, Lille, France
| | - Steven White
- Institute of Transplantation, The Freeman Hospital, Newcastle University, Newcastle upon Tyne, UK
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Salzler RR, Shah D, Doré A, Bauerlein R, Miloscio L, Latres E, Papadopoulos NJ, Olson WC, MacDonald D, Duan X. Myostatin deficiency but not anti-myostatin blockade induces marked proteomic changes in mouse skeletal muscle. Proteomics 2017; 16:2019-27. [PMID: 27214824 DOI: 10.1002/pmic.201600006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 01/08/2016] [Revised: 03/31/2016] [Accepted: 05/18/2016] [Indexed: 11/09/2022]
Abstract
Pharmacologic blockade of the myostatin (Mstn)/activin receptor pathway is being pursued as a potential therapy for several muscle wasting disorders. The functional benefits of blocking this pathway are under investigation, in particular given the findings that greater muscle hypertrophy results from Mstn deficiency arising from genetic ablation compared to post-developmental Mstn blockade. Using high-resolution MS coupled with SILAC mouse technology, we quantitated the relative proteomic changes in gastrocnemius muscle from Mstn knockout (Mstn(-/-) ) and mice treated for 2-weeks with REGN1033, an anti-Mstn antibody. Relative to wild-type animals, Mstn(-/-) mice had a two-fold greater muscle mass and a >1.5-fold change in expression of 12.0% of 1137 quantified muscle proteins. In contrast, mice treated with REGN1033 had minimal changes in muscle proteome (0.7% of 1510 proteins >1.5-fold change, similar to biological difference 0.5% of 1310) even though the treatment induced significant 20% muscle mass increase. Functional annotation of the altered proteins in Mstn(-/-) mice corroborates the mutiple physiological changes including slow-to-fast fiber type switch. Thus, the proteome-wide protein expression differs between Mstn(-/-) mice and mice subjected to specific Mstn blockade post-developmentally, providing molecular-level insights to inform mechanistic hypotheses to explain the observed functional differences.
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Affiliation(s)
- Robert R Salzler
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | - Darshit Shah
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | - Anthony Doré
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | - Roy Bauerlein
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | - Lawrence Miloscio
- Muscle and Metabolism, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | - Esther Latres
- Muscle and Metabolism, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | | | - William C Olson
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
| | | | - Xunbao Duan
- Therapeutic Proteins, Regeneron Pharmaceuticals, Tarrytown, NY, USA
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7
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Latres E, Mastaitis J, Fury W, Miloscio L, Trejos J, Pangilinan J, Okamoto H, Cavino K, Na E, Papatheodorou A, Willer T, Bai Y, Hae Kim J, Rafique A, Jaspers S, Stitt T, Murphy AJ, Yancopoulos GD, Gromada J. Activin A more prominently regulates muscle mass in primates than does GDF8. Nat Commun 2017; 8:15153. [PMID: 28452368 PMCID: PMC5414365 DOI: 10.1038/ncomms15153] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [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] [Received: 09/08/2016] [Accepted: 03/06/2017] [Indexed: 12/19/2022] Open
Abstract
Growth and differentiation factor 8 (GDF8) is a TGF-β superfamily member, and negative regulator of skeletal muscle mass. GDF8 inhibition results in prominent muscle growth in mice, but less impressive hypertrophy in primates, including man. Broad TGF-β inhibition suggests another family member negatively regulates muscle mass, and its blockade enhances muscle growth seen with GDF8-specific inhibition. Here we show that activin A is the long-sought second negative muscle regulator. Activin A specific inhibition, on top of GDF8 inhibition, leads to pronounced muscle hypertrophy and force production in mice and monkeys. Inhibition of these two ligands mimics the hypertrophy seen with broad TGF-β blockers, while avoiding the adverse effects due to inhibition of multiple family members. Altogether, we identify activin A as a second negative regulator of muscle mass, and suggest that inhibition of both ligands provides a preferred therapeutic approach, which maximizes the benefit:risk ratio for muscle diseases in man. Inhibition of GDF8 increases muscle mass in mice, but is less effective in monkeys and humans. Here the authors show that activin A also inhibits muscle hypertrophy and that concomitant inhibition of activin A and GDF8 synergistically increases muscle mass in mice and non-human primates.
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Affiliation(s)
- Esther Latres
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Jason Mastaitis
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Wen Fury
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Lawrence Miloscio
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Jesus Trejos
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Jeffrey Pangilinan
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Haruka Okamoto
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Katie Cavino
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Erqian Na
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Angelos Papatheodorou
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Tobias Willer
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Yu Bai
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Jee Hae Kim
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Ashique Rafique
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Stephen Jaspers
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Trevor Stitt
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Andrew J Murphy
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - George D Yancopoulos
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
| | - Jesper Gromada
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, New York 10591, USA
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8
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Latres E, Pangilinan J, Miloscio L, Bauerlein R, Na E, Potocky TB, Huang Y, Eckersdorff M, Rafique A, Mastaitis J, Lin C, Murphy AJ, Yancopoulos GD, Gromada J, Stitt T. Myostatin blockade with a fully human monoclonal antibody induces muscle hypertrophy and reverses muscle atrophy in young and aged mice. Skelet Muscle 2015; 5:34. [PMID: 26457176 PMCID: PMC4600334 DOI: 10.1186/s13395-015-0060-8] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 09/29/2015] [Indexed: 01/08/2023] Open
Abstract
Background Loss of skeletal muscle mass and function in humans is associated with significant morbidity and mortality. The role of myostatin as a key negative regulator of skeletal muscle mass and function has supported the concept that inactivation of myostatin could be a useful approach for treating muscle wasting diseases. Methods We generated a myostatin monoclonal blocking antibody (REGN1033) and characterized its effects in vitro using surface plasmon resonance biacore and cell-based Smad2/3 signaling assays. REGN1033 was tested in mice for the ability to induce skeletal muscle hypertrophy and prevent atrophy induced by immobilization, hindlimb suspension, or dexamethasone. The effect of REGN1033 on exercise training was tested in aged mice. Messenger RNA sequencing, immunohistochemistry, and ex vivo force measurements were performed on skeletal muscle samples from REGN1033-treated mice. Results The human monoclonal antibody REGN1033 is a specific and potent myostatin antagonist. Chronic treatment of mice with REGN1033 increased muscle fiber size, muscle mass, and force production. REGN1033 prevented the loss of muscle mass induced by immobilization, glucocorticoid treatment, or hindlimb unweighting and increased the gain of muscle mass during recovery from pre-existing atrophy. In aged mice, REGN1033 increased muscle mass and strength and improved physical performance during treadmill exercise. Conclusions We show that specific myostatin antagonism with the human antibody REGN1033 enhanced muscle mass and function in young and aged mice and had beneficial effects in models of skeletal muscle atrophy.
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Affiliation(s)
- Esther Latres
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Jeffrey Pangilinan
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Lawrence Miloscio
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Roy Bauerlein
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Erqian Na
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Terra B Potocky
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Ying Huang
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Mark Eckersdorff
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Ashique Rafique
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Jason Mastaitis
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Calvin Lin
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Andrew J Murphy
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - George D Yancopoulos
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Jesper Gromada
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
| | - Trevor Stitt
- Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591 USA
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9
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Cohen S, Brault JJ, Gygi SP, Glass DJ, Valenzuela DM, Gartner C, Latres E, Goldberg AL. During muscle atrophy, thick, but not thin, filament components are degraded by MuRF1-dependent ubiquitylation. J Exp Med 2009. [DOI: 10.1084/jem2067oia13] [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: 11/04/2022] Open
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10
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Cohen S, Brault JJ, Gygi SP, Glass DJ, Valenzuela DM, Gartner C, Latres E, Goldberg AL. During muscle atrophy, thick, but not thin, filament components are degraded by MuRF1-dependent ubiquitylation. ACTA ACUST UNITED AC 2009; 185:1083-95. [PMID: 19506036 PMCID: PMC2711608 DOI: 10.1083/jcb.200901052] [Citation(s) in RCA: 444] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Loss of myofibrillar proteins is a hallmark of atrophying muscle. Expression of muscle RING-finger 1 (MuRF1), a ubiquitin ligase, is markedly induced during atrophy, and MuRF1 deletion attenuates muscle wasting. We generated mice expressing a Ring-deletion mutant MuRF1, which binds but cannot ubiquitylate substrates. Mass spectrometry of the bound proteins in denervated muscle identified many myofibrillar components. Upon denervation or fasting, atrophying muscles show a loss of myosin-binding protein C (MyBP-C) and myosin light chains 1 and 2 (MyLC1 and MyLC2) from the myofibril, before any measurable decrease in myosin heavy chain (MyHC). Their selective loss requires MuRF1. MyHC is protected from ubiquitylation in myofibrils by associated proteins, but eventually undergoes MuRF1-dependent degradation. In contrast, MuRF1 ubiquitylates MyBP-C, MyLC1, and MyLC2, even in myofibrils. Because these proteins stabilize the thick filament, their selective ubiquitylation may facilitate thick filament disassembly. However, the thin filament components decreased by a mechanism not requiring MuRF1.
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Affiliation(s)
- Shenhav Cohen
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
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11
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Abstract
The gut hormone ghrelin is known to activate hypothalamic AMPK, a crucial metabolic sensor controlling energy balance. In this issue of Cell Metabolism, Anderson et al. (2008) show that CaMKK2 mediates this effect by forming a unique complex of AMPKalpha/beta with acetyl-CoA carboxylase (ACC) in a pathway distinct from the more established AMP/LKB1 pathway.
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Affiliation(s)
- Mark W Sleeman
- Regeneron Pharmaceuticals, Inc., Tarrytown, NY 10591, USA.
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12
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Okamoto H, Latres E, Liu R, Thabet K, Murphy A, Valenzeula D, Yancopoulos GD, Stitt TN, Glass DJ, Sleeman MW. Genetic deletion of Trb3, the mammalian Drosophila tribbles homolog, displays normal hepatic insulin signaling and glucose homeostasis. Diabetes 2007; 56:1350-6. [PMID: 17303803 DOI: 10.2337/db06-1448] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [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: 11/13/2022]
Abstract
Trb3, a mammalian homolog of Drosophila tribbles, was proposed as a suppressor of Akt activity, predominantly in conditions of fasting and diabetes. Given these prior studies, we sought to determine whether Trb3 plays a major role in modulating hepatic insulin sensitivity. To answer this question, we produced mice in which a lacZ reporter was knocked into the locus containing the gene Trib3, resulting in a Trib3 null animal. Trib3 expression analyses demonstrated that the Trib3 is expressed in liver, adipose tissues, heart, kidney, lung, skin, small intestine, stomach, and denervated, but not normal, skeletal muscle. Trib3(-/-) mice are essentially identical to their wild-type littermates in overall appearance and body composition. Phenotypic analysis of Trib3(-/-) mice did not detect any alteration in serum glucose, insulin, or lipid levels; glucose or insulin tolerance; or energy metabolism. Studies in Trib3(-/-) hepatocytes revealed normal Akt and glycogen synthase kinase- 3beta phosphorylation patterns, glycogen levels, and expressions of key regulatory gluconeogenic and glycolytic genes. These data demonstrate that deletion of Trib3 has minimal effect on insulin-induced Akt activation in hepatic tissue, and, as such, they question any nonredundant role for Trb3 in the maintenance of glucose and energy homeostasis in mice.
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13
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Latres E, Amini AR, Amini AA, Griffiths J, Martin FJ, Wei Y, Lin HC, Yancopoulos GD, Glass DJ. Insulin-like growth factor-1 (IGF-1) inversely regulates atrophy-induced genes via the phosphatidylinositol 3-kinase/Akt/mammalian target of rapamycin (PI3K/Akt/mTOR) pathway. J Biol Chem 2004; 280:2737-44. [PMID: 15550386 DOI: 10.1074/jbc.m407517200] [Citation(s) in RCA: 373] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Skeletal muscle size is regulated by anabolic (hypertrophic) and catabolic (atrophic) processes. We first characterized molecular markers of both hypertrophy and atrophy and identified a small subset of genes that are inversely regulated in these two settings (e.g. up-regulated by an inducer of hypertrophy, insulin-like growth factor-1 (IGF-1), and down-regulated by a mediator of atrophy, dexamethasone). The genes identified as being inversely regulated by atrophy, as opposed to hypertrophy, include the E3 ubiquitin ligase MAFbx (also known as atrogin-1). We next sought to investigate the mechanism by which IGF-1 inversely regulates these markers, and found that the phosphatidylinositol 3-kinase/Akt/mammalian target of rapamycin (PI3K/Akt/mTOR) pathway, which we had previously characterized as being critical for hypertrophy, is also required to be active in order for IGF-1-mediated transcriptional changes to occur. We had recently demonstrated that the IGF1/PI3K/Akt pathway can block dexamethasone-induced up-regulation of the atrophy-induced ubiquitin ligases MuRF1 and MAFbx by blocking nuclear translocation of a FOXO transcription factor. In the current study we demonstrate that an additional step of IGF1 transcriptional regulation occurs downstream of mTOR, which is independent of FOXO. Thus both the Akt/FOXO and the Akt/mTOR pathways are required for the transcriptional changes induced by IGF-1.
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Affiliation(s)
- Esther Latres
- Regeneron Pharmaceuticals, Inc., Tarrytown, New York 10591-6707, USA
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14
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Kudo Y, Guardavaccaro D, Santamaria PG, Koyama-Nasu R, Latres E, Bronson R, Yamasaki L, Pagano M. Role of F-box protein betaTrcp1 in mammary gland development and tumorigenesis. Mol Cell Biol 2004; 24:8184-94. [PMID: 15340078 PMCID: PMC515055 DOI: 10.1128/mcb.24.18.8184-8194.2004] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [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] [Indexed: 11/20/2022] Open
Abstract
The F-box protein betaTrcp1 controls the stability of several crucial regulators of proliferation and apoptosis, including certain inhibitors of the NF-kappaB family of transcription factors. Here we show that mammary glands of betaTrcp1(-/-) female mice display a hypoplastic phenotype, whereas no effects on cell proliferation are observed in other somatic cells. To investigate further the role of betaTrcp1 in mammary gland development, we generated transgenic mice expressing human betaTrcp1 targeted to epithelial cells under the control of the mouse mammary tumor virus (MMTV) long terminal repeat promoter. Compared to controls, MMTV betaTrcp1 mammary glands display an increase in lateral ductal branching and extensive arrays of alveolus-like protuberances. The mammary epithelia of MMTV betaTrcp1 mice proliferate more and show increased NF-kappaB DNA binding activity and higher levels of nuclear NF-kappaB p65/RelA. In addition, 38% of transgenic mice develop tumors, including mammary, ovarian, and uterine carcinomas. The targeting of betaTrcp1 to lymphoid organs produces no effects on these tissues. In summary, our results support the notion that betaTrcp1 positively controls the proliferation of breast epithelium and indicate that alteration of betaTrcp1 function and expression may contribute to malignant behavior of breast tumors, at least in part through NF-kappaB transactivation.
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Affiliation(s)
- Yasusei Kudo
- Department of Pathology and NYU Cancer Institute, New York University School of Medicine, NY 10016, USA
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15
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Bodine SC, Latres E, Baumhueter S, Lai VK, Nunez L, Clarke BA, Poueymirou WT, Panaro FJ, Na E, Dharmarajan K, Pan ZQ, Valenzuela DM, DeChiara TM, Stitt TN, Yancopoulos GD, Glass DJ. Identification of ubiquitin ligases required for skeletal muscle atrophy. Science 2001; 294:1704-8. [PMID: 11679633 DOI: 10.1126/science.1065874] [Citation(s) in RCA: 2514] [Impact Index Per Article: 109.3] [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] [Indexed: 11/02/2022]
Abstract
Skeletal muscle adapts to decreases in activity and load by undergoing atrophy. To identify candidate molecular mediators of muscle atrophy, we performed transcript profiling. Although many genes were up-regulated in a single rat model of atrophy, only a small subset was universal in all atrophy models. Two of these genes encode ubiquitin ligases: Muscle RING Finger 1 (MuRF1), and a gene we designate Muscle Atrophy F-box (MAFbx), the latter being a member of the SCF family of E3 ubiquitin ligases. Overexpression of MAFbx in myotubes produced atrophy, whereas mice deficient in either MAFbx or MuRF1 were found to be resistant to atrophy. These proteins are potential drug targets for the treatment of muscle atrophy.
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MESH Headings
- Amino Acid Sequence
- Animals
- Cloning, Molecular
- Creatine Kinase/genetics
- Creatine Kinase, MM Form
- DNA-Binding Proteins
- Gene Deletion
- Gene Expression Profiling
- Hindlimb Suspension
- Humans
- Immobilization
- Isoenzymes/genetics
- Mice
- Mice, Knockout
- Molecular Sequence Data
- Muscle Denervation
- Muscle Proteins/genetics
- Muscle, Skeletal/growth & development
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- Muscular Atrophy/genetics
- Muscular Atrophy/pathology
- Muscular Atrophy/physiopathology
- MyoD Protein/genetics
- Myogenic Regulatory Factor 5
- Myogenin/genetics
- Peptide Synthases/chemistry
- Peptide Synthases/deficiency
- Peptide Synthases/genetics
- Peptide Synthases/metabolism
- Phenotype
- Protein Binding
- RNA, Messenger/analysis
- RNA, Messenger/genetics
- Rats
- Rats, Sprague-Dawley
- SKP Cullin F-Box Protein Ligases
- Trans-Activators
- Up-Regulation
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Affiliation(s)
- S C Bodine
- Regeneron Pharmaceuticals, 777 Old Saw Mill River Road, Tarrytown, NY, 10591-6707, USA
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16
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DeSalle LM, Latres E, Lin D, Graner E, Montagnoli A, Baker RT, Pagano M, Loda M. The de-ubiquitinating enzyme Unp interacts with the retinoblastoma protein. Oncogene 2001; 20:5538-42. [PMID: 11571652 DOI: 10.1038/sj.onc.1204824] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 01/05/2001] [Revised: 04/12/2001] [Accepted: 07/11/2001] [Indexed: 11/08/2022]
Abstract
The ubiquitin pathway is involved in the proteolytic turnover of many short-lived cellular regulatory proteins. Since selective degradation of substrates of this system requires the covalent attachment of a polyubiquitin chain to the substrates, degradation could be counteracted by de-ubiquitinating enzymes (or isopeptidases) which selectively remove the polyubiquitin chain. Unp is a human isopeptidase with still poorly understood biological functions. Here, we show that cellular Unp specifically interacts with the retinoblastoma gene product (pRb).
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Affiliation(s)
- L M DeSalle
- Department of Pathology and Kaplan Comprehensive Cancer Center, MSB 548, New York University Medical Center, 550 First Avenue, New York, NY 10016, USA
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17
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Spiegelman VS, Stavropoulos P, Latres E, Pagano M, Ronai Z, Slaga TJ, Fuchs SY. Induction of β-Transducin Repeat-containing Protein by JNK Signaling and Its Role in the Activation of NF-κB. J Biol Chem 2001; 276:27152-8. [PMID: 11375388 DOI: 10.1074/jbc.m100031200] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [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] [Indexed: 11/06/2022] Open
Abstract
Activation of Jun N-kinase (JNK) and NF-kappaB transcription factor are the hallmarks of cellular response to stress. Phosphorylation of NF-kappaB inhibitor (IkappaB) by respective stress-inducible kinases (IKK) is a key event in NF-kappaB activation. beta-TrCP F-box protein mediates ubiquitination of phosphorylated IkappaB via recruitment of SCF(beta-TrCP)-Roc1 E3 ubiquitin ligase complex. Subsequent proteasome-dependent degradation of IkappaB results in activation of the NF-kappaB pathway. We found that a variety of cellular stress stimuli induce an increase in the steady state levels of beta-TrCP mRNA and protein levels in human cells. Activation of stress-activated protein kinases JNK (and, to a lesser extent, p38) by forced expression of constitutively active mutants of JNKK2 and MKK6 (but not MEK1 or IKKbeta) also leads to accumulation of beta-TrCP. Transcription of the beta-TrCP gene is not required for JNK-mediated induction of beta-TrCP. A synergistic effect of stimulation of IKK and JNK on the transcriptional activity of NF-kappaB was observed. The mechanisms of beta-TrCP induction via stress and its role in NF-kappaB activation are discussed.
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Affiliation(s)
- V S Spiegelman
- AMC Cancer Research Center, Lakewood, Colorado 80214, Ruttenberg Cancer Center, Mount Sinai School of Medicine, New York, New York 10029, USA
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18
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Zindy F, den Besten W, Chen B, Rehg JE, Latres E, Barbacid M, Pollard JW, Sherr CJ, Cohen PE, Roussel MF. Control of spermatogenesis in mice by the cyclin D-dependent kinase inhibitors p18(Ink4c) and p19(Ink4d). Mol Cell Biol 2001; 21:3244-55. [PMID: 11287627 PMCID: PMC86968 DOI: 10.1128/mcb.21.9.3244-3255.2001] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [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: 11/14/2000] [Accepted: 02/13/2001] [Indexed: 12/31/2022] Open
Abstract
Male mice lacking both the Ink4c and Ink4d genes, which encode two inhibitors of D-type cyclin-dependent kinases (Cdks), are infertile, whereas female fecundity is unaffected. Both p18(Ink4c) and p19(Ink4d) are expressed in the seminiferous tubules of postnatal wild-type mice, being largely confined to postmitotic spermatocytes undergoing meiosis. Their combined loss is associated with the delayed exit of spermatogonia from the mitotic cell cycle, leading to the retarded appearance of meiotic cells that do not properly differentiate and instead undergo apoptosis at an increased frequency. As a result, mice lacking both Ink4c and Ink4d produce few mature sperm, and the residual spermatozoa have reduced motility and decreased viability. Whether or not Ink4d is present, animals lacking Ink4c develop hyperplasia of interstitial testicular Leydig cells, which produce reduced levels of testosterone. The anterior pituitary of fertile mice lacking Ink4c or infertile mice doubly deficient for Ink4c and Ink4d produces normal levels of luteinizing hormone (LH). Therefore, the failure of Leydig cells to produce testosterone is not secondary to defects in LH production, and reduced testosterone levels do not account for infertility in the doubly deficient strain. By contrast, Ink4d-null or double-null mice produce elevated levels of follicle-stimulating hormone (FSH). Because Ink4d-null mice are fertile, increased FSH production by the anterior pituitary is also unlikely to contribute to the sterility observed in Ink4c/Ink4d double-null males. Our data indicate that p18(Ink4c) and p19(Ink4d) are essential for male fertility. These two Cdk inhibitors collaborate in regulating spermatogenesis, helping to ensure mitotic exit and the normal meiotic maturation of spermatocytes.
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Affiliation(s)
- F Zindy
- Departments of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA
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19
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Abstract
The F-box protein Skp2 (S-phase kinase-associated protein 2) positively regulates the G(1)-S transition by controlling the stability of several G(1) regulators, such as the cell cycle inhibitor p27. We show here that Skp2 expression correlates directly with grade of malignancy and inversely with p27 levels in human lymphomas. To directly evaluate the potential of Skp2 to deregulate growth in vivo, we generated transgenic mice expressing Skp2 targeted to the T-lymphoid lineage as well as double transgenic mice coexpressing Skp2 and activated N-Ras. A strong cooperative effect between these two transgenes induced T cell lymphomas with shorter latency and higher penetrance, leading to significantly decreased survival when compared with control and single transgenic animals. Furthermore, lymphomas of Nras single transgenic animals often expressed higher levels of endogenous Skp2 than tumors of double transgenic mice. This study provides evidence of a role for an F-box protein in oncogenesis and establishes SKP2 as a protooncogene causally involved in the pathogenesis of lymphomas.
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Affiliation(s)
- E Latres
- Department of Pathology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, 550 First Avenue, MSB 548, New York, NY 10016, USA
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20
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Latres E, Malumbres M, Sotillo R, Martín J, Ortega S, Martín-Caballero J, Flores JM, Cordón-Cardo C, Barbacid M. Limited overlapping roles of P15(INK4b) and P18(INK4c) cell cycle inhibitors in proliferation and tumorigenesis. EMBO J 2000; 19:3496-506. [PMID: 10880462 PMCID: PMC313938 DOI: 10.1093/emboj/19.13.3496] [Citation(s) in RCA: 199] [Impact Index Per Article: 8.3] [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] [Indexed: 01/07/2023] Open
Abstract
Entry of quiescent cells into the cell cycle is driven by the cyclin D-dependent kinases Cdk4 and Cdk6. These kinases are negatively regulated by the INK4 cell cycle inhibitors. We report the generation of mice defective in P15(INK4b) and P18(INK4c). Ablation of these genes, either alone or in combination, does not abrogate cell contact inhibition or senescence of mouse embryo fibroblasts in culture. However, loss of P15(INK4b), but not of P18(INK4c), confers proliferative advantage to these cells and makes them more sensitive to transformation by H-ras oncogenes. In vivo, ablation of P15(INK4b) and P18(INK4c) genes results in lymphoproliferative disorders and tumor formation. Mice lacking P18(INK4c) have deregulated epithelial cell growth leading to the formation of cysts, mostly in the cortical region of the kidneys and the mammary epithelium. Loss of both P15(INK4b) and P18(INK4c) does not result in significantly distinct phenotypic manifestations except for the appearance of cysts in additional tissues. These results indicate that P15(INK4b) and P18(IKN4c) are tumor suppressor proteins that act in different cellular lineages and/or pathways with limited compensatory roles.
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Affiliation(s)
- E Latres
- Molecular Oncology Program, Centro Nacional de Investigaciones Oncológicas Carlos III, 28220 Majadahonda, Centro Nacional de Biotecnología, CSIC, Campus Universidad Autónoma and Departamento de Patología Animal II, Facultad de Veterinar
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21
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Abstract
Ubiquitin-conjugation targets numerous cellular regulators for proteasome-mediated degradation. Thus, the identification of ubiquitin ligases and their physiological substrates is crucially important, especially for those cases in which aberrant levels of regulatory proteins (e.g., beta-catenin, p27) result from a deregulated ubiquitination pathway. In yeast, the proteolysis of several G1 regulators is controlled by ubiquitin ligases (or SCFs) formed by three subunits: Skp1, Cul A (Cdc53), and one of many F-box proteins. Specific F-box proteins (Fbps) recruit different substrates to the SCF. Although many Fbps have been identified in mammals, their specific substrates and the existence of multiple SCFs have not yet been reported. We have found that one human Fbp, beta-Trcp (beta-Transducin repeat containing protein), does indeed form a novel SCF with human Skp1 and Cul1. Consistent with recent reports indicating that Xenopus and Drosophila beta-Trcp homologs act as negative regulators of the Wnt/beta-catenin signaling pathway, we report here that human beta-Trcp interacts with beta-catenin in vivo. Furthermore, beta-catenin is specifically stabilized in vivo by the expression of a dominant negative beta-Trcp. These results indicate that the Cul1/Skp1/beta-Trcp complex forms a ubiquitin ligase that mediates the degradation of beta-catenin.
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Affiliation(s)
- E Latres
- Department of Pathology and Kaplan Comprehensive Cancer Center, New York University Medical Center, NY 10016, USA
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22
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Orlow I, Iavarone A, Crider-Miller SJ, Bonilla F, Latres E, Lee MH, Gerald WL, Massagué J, Weissman BE, Cordón-Cardó C. Cyclin-dependent kinase inhibitor p57KIP2 in soft tissue sarcomas and Wilms'tumors. Cancer Res 1996; 56:1219-21. [PMID: 8640801] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Mammalian cyclin-dependent kinase inhibitors fall into two families, the INK4 and the CIP/KIP. The CIP/KIP family comprises three structurally related members, including p21CiP1/WAF1, p27KIP1, and p57KIP2. These proteins are all capable of inhibiting the progression of the cell cycle by binding and inhibiting G(1) cyclin/cyclin-dependent kinase complexes. In humans, p57KIP2 is expressed specifically in skeletal muscle, heart, brain, kidney, and lung. Human KIP2 resides in 11p15.5, a chromosomal region that is a common site for loss of heterozygosity in certain sarcomas, Wilms' tumors, and tumors associated with the Beckwith-Wiedemann syndrome. Because of the function, selective expression, and chromosomal location of p57KIP2, we undertook the present study to search for potential mutations of KIP2 in a cohort of 126 tumors composed of 75 soft tissue sarcomas and 51 Wilms' tumors. The KIP2 gene was characterized by Southern blot, comparative multiplex PCR, PCR -single-strand conformational polymorphism, and DNA sequencing assays in these neoplasms. Deletions of the KIP2 gene or point mutations at the region encoding the cyclin-dependent kinase inhibitory domain were not found in the tumors analyzed. The absence of KIP2 mutations might indicate that these tumors arise due to defects at a closely linked but separate locus. Alternatively, similarly to the mouse homologue, inactivation of KIP2 could occur via genomic imprinting.
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Affiliation(s)
- I Orlow
- Memorial Sloan-Kettering Cancer Center, New York 10021, USA
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23
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Karpeh MS, Brennan MF, Cance WG, Woodruff JM, Pollack D, Casper ES, Dudas ME, Latres E, Drobnjak M, Cordon-Cardo C. Altered patterns of retinoblastoma gene product expression in adult soft-tissue sarcomas. Br J Cancer 1995; 72:986-91. [PMID: 7547254 PMCID: PMC2034041 DOI: 10.1038/bjc.1995.447] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [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] [Indexed: 01/25/2023] Open
Abstract
Altered expression of the retinoblastoma (RB) tumour-suppressor gene product (pRB) has been detected in sporadic bone and soft-tissue sarcomas. Earlier studies, analysing small cohorts of sarcoma patients, have suggested that these alterations are more commonly associated with high-grade tumours, metastatic lesions and poorer survival. This study was designed to re-examine the prevalence and clinical significance of altered pRB expression in a large and selected group of soft-tissue sarcomas from 174 adult patients. Representative tissue sections from these sarcomas were analysed by immunohistochemistry using a well-characterised anti-pRB monoclonal antibody. Tumours were considered to have a positive pRB phenotype only when pure nuclear staining was demonstrated, and cases were segregated into one of three groups. Group 1 (n = 36) were patients whose tumours have minimal or undetectable pRB nuclear staining (< 20% of tumour cells) and were considered pRB negative. Patients with tumours staining in a heterogeneous pattern (20-79% of tumour cells) were classified as group 2 (n = 99). The staining of group 3 (n = 39) was strongly positive with a homogeneous pRB nuclear immunoreactivity (80-100% of tumour cells). pRB alterations were frequently observed in both low- and high-grade lesions. Altered pRB expression did not correlate with known predictors of survival and was not itself an independent predictor of outcome in the long-term follow-up. These findings support earlier observations that alterations of pRB expression are common events in soft-tissue sarcomas; nevertheless, long-term follow-up results indicate that altered patterns of pRB expression do not influence clinical outcome of patients affected with soft-tissue sarcomas. It is postulated that RB alterations are primary events in human sarcomas and may be involved in tumorigenesis or early phases of tumour progression in these neoplasias.
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Affiliation(s)
- M S Karpeh
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
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24
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Gruis NA, Weaver-Feldhaus J, Liu Q, Frye C, Eeles R, Orlow I, Lacombe L, Ponce-Castaneda V, Lianes P, Latres E. Genetic evidence in melanoma and bladder cancers that p16 and p53 function in separate pathways of tumor suppression. Am J Pathol 1995; 146:1199-206. [PMID: 7747814 PMCID: PMC1869278] [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] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The 9p21 region of human chromosome 9 is a hot spot for chromosomal aberrations in both cultured cell lines and primary tumors. This region contains a gene, P16 (also called MTS1, CDKN2 and p16INK4), that encodes a presumptive negative cell cycle regulator called p16. P16 is deleted or mutated at high frequency in a variety of tumor cell lines including melanoma and bladder carcinoma lines. As such, it is likely to be a tumor suppressor gene. Here we show that P16 is mutated in primary bladder carcinomas (3 of 33) and melanomas (5 of 34). These findings support studies that show P16 mutations are not solely a product of growth in tissue culture but rather are involved in formation of tumors in viva. Some bladder primary tumors and some bladder and melanoma tumor cell lines contain mutations in both P16 and P53 at frequencies that suggest that p53 and p16 function in different pathways, each of which is important in suppressing malignant transformation.
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Affiliation(s)
- N A Gruis
- Myriad Genetics, Inc., Salt Lake City, UT 84108, USA
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25
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Ponce-Castañeda MV, Lee MH, Latres E, Polyak K, Lacombe L, Montgomery K, Mathew S, Krauter K, Sheinfeld J, Massague J. p27Kip1: chromosomal mapping to 12p12-12p13.1 and absence of mutations in human tumors. Cancer Res 1995; 55:1211-4. [PMID: 7882310] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The p27Kip1 gene codes for a cyclin-dependent kinase inhibitor implicated in G1 arrest by transforming growth factor beta, cell-cell contact, agents that elevate cyclic AMP, and the growth-inhibitory drug rapamycin. p27 binds to and inhibits complexes formed by cyclin E-cdk2, cyclin A-cdk2, and cyclin D-cdk4. The involvement of p27 in the negative regulation of cell proliferation suggests that it may also function as a tumor suppressor gene. Using a combination of somatic cell hybrid panels and fluorescence in situ hybridization p27Kip1 has been mapped to the short arm of chromosome 12 at the 12p12-12p13.1 boundary, reported to harbor deletions and rearrangements in leukemia and mesotheliomas. In order to assess potential p27Kip1 gene alterations, we have screened a total of 147 human primary solid tumors and found no detectable cancer-specific mutations. These results argue that the often observed loss of antimitogenic transforming growth factor beta responsiveness in human cancer cells is not due to structural defects in p27Kip1.
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Affiliation(s)
- M V Ponce-Castañeda
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021
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26
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Abstract
Many human cancers present deletions of the short arm of chromosome 17, which includes the TP53 locus. We detected a new polymorphism in intron 2 of the TP53 gene using PCR-SSCP and used this polymorphic site as a marker to detect loss of heterozygosity in 135 human tumors (73 soft tissue sarcomas, and 48 colorectal and 14 bladder carcinomas). Heterozygosity for this site was 41.5% in this study group and tumor-specific loss of alleles occurred in 43% of informative cases. Allelic losses were more frequently detected at this site than at that in which restriction fragment length polymorphism (RFLP) is located, as detected by the pHp53B probe. It is concluded that this novel approach has several advantages, including detection of a high incidence of informative cases and minimal tissue requirements.
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Affiliation(s)
- M R Oliva
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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27
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Latres E, Drobnjak M, Pollack D, Oliva MR, Ramos M, Karpeh M, Woodruff JM, Cordon-Cardo C. Chromosome 17 abnormalities and TP53 mutations in adult soft tissue sarcomas. Am J Pathol 1994; 145:345-55. [PMID: 8053493 PMCID: PMC1887397] [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] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This study was designed to determine the frequency of structural genetic abnormalities of chromosome 17 and the incidence of TP53 mutations as they relate to the biological behavior of adult soft tissue sarcomas. We analyzed a group of 73 soft tissue sarcomas of adults that were clinically and pathologically well characterized using molecular genetic techniques and expression studies. We then correlated genotype and phenotype with pathological parameters. Overall, allelic loss of 17p and 17q was identified in 53 and 29% of informative cases, respectively. p53 nuclear overexpression was detected in 34% of the tumors analyzed. We observed an association between 17p deletions and tumor presentation being more frequent in recurrent and metastatic tumors than primary lesion. p53 nuclear overexpression was associated with tumor grade, size, and more frequently detected in metastatic than primary sarcomas. The 11 intragenic mutations characterized included 10 cases of single base substitution and one single base deletion; 8 were of the missense type and 3 were nonsense. It is concluded that 17p deletions and TP53 mutations are common events in adult soft tissue sarcomas and that due to the trends observed with the cohort of patients analyzed they may become prognostic markers for patients affected with these tumors.
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Affiliation(s)
- E Latres
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021
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Drobnjak M, Latres E, Pollack D, Karpeh M, Dudas M, Woodruff JM, Brennan MF, Cordon-Cardo C. Prognostic implications of p53 nuclear overexpression and high proliferation index of Ki-67 in adult soft-tissue sarcomas. J Natl Cancer Inst 1994; 86:549-54. [PMID: 8133539 DOI: 10.1093/jnci/86.7.549] [Citation(s) in RCA: 115] [Impact Index Per Article: 3.8] [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] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND Morphologically similar soft-tissue sarcomas may behave in very different fashions, making it difficult to predict clinical outcomes and to properly design therapeutic interventions. In a preliminary study, we observed that TP53 mutations and nuclear overexpression of p53 protein were frequent events in soft-tissue sarcoma, and we noticed an association between p53-positive phenotype and poor clinical outcome. PURPOSE We examined the potential clinical relevance of p53 overexpression in adults with soft-tissue sarcomas. We also studied the clinical implications of a high proliferation index. METHODS A cohort of 174 adults with soft-tissue sarcomas were analyzed using anti-p53 and anti-Ki-67 antibodies and immunohistochemical assays on consecutive fresh frozen tissue samples. RESULTS We observed a significant association between p53 nuclear overexpression and tumor grade (P = .001) and tumor size (P = .01). Patients displaying a p53-positive phenotype had significantly reduced survival (P = .02). Similarly, a significant difference was observed between high proliferation index and tumor grade (P < .001) and reduced patient survival (P = .03). A high Ki-67 proliferation index was detected in association with p53 nuclear overexpression. CONCLUSIONS Overexpression of p53 protein and a high proliferation index strongly correlate with poor clinical outcome and reduced survival in patients having soft-tissue sarcomas.
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Affiliation(s)
- M Drobnjak
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021
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Cordon-Cardo C, Latres E, Drobnjak M, Oliva MR, Pollack D, Woodruff JM, Marechal V, Chen J, Brennan MF, Levine AJ. Molecular abnormalities of mdm2 and p53 genes in adult soft tissue sarcomas. Cancer Res 1994; 54:794-9. [PMID: 8306343] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Genetic alterations in the p53 and mdm2 genes have been reported to occur in soft tissue sarcomas. This study was designed to determine the prevalence and potential clinical value of detected molecular abnormalities and altered patterns of expression of mdm2 and p53 genes in adult soft tissue sarcomas. A cohort of 211 soft tissue sarcomas from adults that were both clinically and pathologically well characterized was analyzed. Monoclonal antibodies directed against mdm2 and p53 proteins were used to measure overexpression of these proteins in the nuclei of cells from sections of these tumors. Seventy-six of 207 tumors had abnormally high levels of mdm2 proteins and 56 of 211 tumors overexpressed p53 protein. Twenty-two cases had abnormally high levels of both mdm2 and p53 proteins based upon immunoreactivity with these antibodies. There was a striking statistically significant correlation between the overexpression of p53 and mdm2 proteins in the same tumor and poor survival (P < 0.05) of the patients. A group of 73 soft tissue sarcomas was chosen for analysis using Southern blots, single strand conformation polymorphisms, and direct DNA sequencing to confirm mdm2 gene amplifications and p53 mutations and correlate these with the results of the immunoreactivities. The overexpression of p53 and mdm2 proteins in the nuclei of tumor cells did not always correlate well with gene amplification at the mdm2 locus or mutation at the p53 gene. The possible reasons for these discrepancies are discussed.
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Affiliation(s)
- C Cordon-Cardo
- Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021
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Fernández-López JA, Latres E, Remesar X, Alemany M. A radio-enzymatic method for the estimation of L-leucine-specific radioactivity. J Biochem Biophys Methods 1993; 26:291-7. [PMID: 8409201 DOI: 10.1016/0165-022x(93)90030-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A method is presented for the estimation of L-leucine concentration and radioactivity in biological samples. The sample L-leucine is specifically bound to tRNA and its radioactivity estimated in the presence of either added labelled L-leucine or cold L-leucine (in the same proportion), as well as in the presence of a large excess of cold L-leucine. The latter gave the measurement of non-leucine radioactivity present in the sample. The measurements in the presence and absence of labelled/cold L-leucine allowed the estimation of L-leucine levels and radioactivity by using a simple set of calculations and a standard curve built with known cold L-leucine concentrations in the presence of a fixed known amount of [14C]L-leucine.
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Abstract
Core and organ temperatures in the rat have been found to be subject to regular periodic oscillations (with a frequency of ca 12 cycles per day, i.e. 143 mu Hz) within set limits, by using a chronic thermocouple implant procedure. These cycles consisted of consecutive warming (the temperature increased steadily) and cooling periods (the temperature decreased regularly). There were sustained temperature differences between several tissues and that of the aortic blood (core temperature), higher for brown adipose tissue, kidney and liver, and lower for muscle, white adipose tissue and skin. Organ blood flows and cardiac output were measured by a radioactive microsphere retention method applied to unanaesthetized rats. Blood flow measurements were done on unaware rats (see Methods), during either the warming or cooling phases. During the warming phases, there was a higher blood flow across the brown adipose tissue, kidney and skin, with a cardiac output about twice that found in the cooling periods. The haemodynamic changes observed, as well as the organ temperature differences observed with respect to the blood, suggest that periodic changes in blood flow are an essential part of the operation of the thermogenic system.
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Affiliation(s)
- D Closa
- Departament de Bioquímica i Fisiologia, Universitat de Barcelona, Spain
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Latres E, Closa D, Gómez-Sierra JM, Alemany M, Remesae X. Measurement of rat lung blood flow with labelled microspheres. Arch Int Physiol Biochim Biophys 1992; 100:263-5. [PMID: 1382677 DOI: 10.3109/13813459208998112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A modification of the usual microsphere injection method is presented which is appropriate for rat lung blood flow measurement. The injection of microspheres into the abdominal cava vein, together with the sampling of a reference flow from the right ventricle, allowed to calculate pulmonary blood flows in the same range than the cardiac output. The differences between the two figures (about 30%) are attributed to arterio-venous shunts. The tissue distribution of the microspheres bypassing the lung capillary beds agree with this interpretation.
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Affiliation(s)
- E Latres
- Departament de Bioquímica i Fisiologia, Universitat de Barcelona, Spain
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Abstract
A specific enzymatic method for the routine measurement of L-leucine in blood samples is presented. The method uses a commercial preparation of tRNAs and amino acetyl-tRNA synthetases for the specific loading of L-leucine into the tRNA(Leu) present, competing with carrier-free L-[U-14C]leucine. The radioimmunoassay-like plot of radioactivity found in the acid-insoluble (tRNA) fraction was used to determine the amount of unlabelled L-leucine of the samples when compared against a standard curve. The interference of L-isoleucine, L-valine and L-alanine was very low.
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Affiliation(s)
- E Latres
- Departament de Bioquímica i Fisiologia, Universitat de Barcelona, Spain
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