1
|
Breunig SL, Chapman AM, LeBon J, Quijano JC, Ranasinghe M, Rawson J, Demeler B, Ku HT, Tirrell DA. 4S-fluorination of ProB29 in insulin lispro slows fibril formation. J Biol Chem 2024:107332. [PMID: 38703998 DOI: 10.1016/j.jbc.2024.107332] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 04/02/2024] [Accepted: 04/09/2024] [Indexed: 05/06/2024] Open
Abstract
Recombinant insulin is a life-saving therapeutic for millions of patients affected by diabetes mellitus. Standard mutagenesis has led to insulin variants with improved control of blood glucose; for instance, the fast-acting insulin lispro contains two point mutations that suppress dimer formation and expedite absorption. However, insulins undergo irreversible denaturation, a process accelerated for the insulin monomer. Here we replace ProB29 of insulin lispro with 4R-fluoroproline, 4S-fluoroproline, and 4,4-difluoroproline. All three fluorinated lispro variants reduce blood glucose in diabetic mice, exhibit similar secondary structure as measured by circular dichroism, and rapidly dissociate from the zinc- and resorcinol-bound hexamer upon dilution. Notably, however, we find that 4S-fluorination of ProB29 delays the formation of undesired insulin fibrils that can accumulate at the injection site in vivo, and can complicate insulin production and storage. These results demonstrate how subtle molecular changes achieved through non-canonical amino acid mutagenesis can improve the stability of protein therapeutics.
Collapse
Affiliation(s)
- Stephanie L Breunig
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Alex M Chapman
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jeanne LeBon
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute City of Hope, Duarte, California 91010, United States
| | - Janine C Quijano
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute City of Hope, Duarte, California 91010, United States
| | - Maduni Ranasinghe
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| | - Jeffrey Rawson
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute City of Hope, Duarte, California 91010, United States
| | - Borries Demeler
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada; Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Hsun Teresa Ku
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute City of Hope, Duarte, California 91010, United States; Irell & Manella Graduate School of Biological Science, City of Hope, Duarte, California 91010, United States
| | - David A Tirrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
| |
Collapse
|
2
|
Tremblay JR, Ortiz JA, Quijano JC, Zook HN, Erdem N, LeBon JM, Li W, Jou K, Tsark W, Mann JR, Kozlowski MT, Tirrell DA, Esni F, Engle DD, Riggs AD, Ku HT. Rare, Tightly-Bound, Multi-Cellular Clusters in the Pancreatic Ducts of Adult Mice Function Like Progenitor Cells and Survive and Proliferate After Acinar Cell Injury. Stem Cells 2024; 42:385-401. [PMID: 38206366 PMCID: PMC11016848 DOI: 10.1093/stmcls/sxae005] [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: 05/09/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024]
Abstract
Pancreatic ductal progenitor cells have been proposed to contribute to adult tissue maintenance and regeneration after injury, but the identity of such ductal cells remains elusive. Here, from adult mice, we identify a near homogenous population of ductal progenitor-like clusters, with an average of 8 cells per cluster. They are a rare subpopulation, about 0.1% of the total pancreatic cells, and can be sorted using a fluorescence-activated cell sorter with the CD133highCD71lowFSCmid-high phenotype. They exhibit properties in self-renewal and tri-lineage differentiation (including endocrine-like cells) in a unique 3-dimensional colony assay system. An in vitro lineage tracing experiment, using a novel HprtDsRed/+ mouse model, demonstrates that a single cell from a cluster clonally gives rise to a colony. Droplet RNAseq analysis demonstrates that these ductal clusters express embryonic multipotent progenitor cell markers Sox9, Pdx1, and Nkx6-1, and genes involved in actin cytoskeleton regulation, inflammation responses, organ development, and cancer. Surprisingly, these ductal clusters resist prolonged trypsin digestion in vitro, preferentially survive in vivo after a severe acinar cell injury and become proliferative within 14 days post-injury. Thus, the ductal clusters are the fundamental units of progenitor-like cells in the adult murine pancreas with implications in diabetes treatment and tumorigenicity.
Collapse
Affiliation(s)
- Jacob R Tremblay
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- The Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Jose A Ortiz
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- The Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Janine C Quijano
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Heather N Zook
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- The Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Neslihan Erdem
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- The Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Jeanne M LeBon
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Wendong Li
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Kevin Jou
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Walter Tsark
- Center for Comparative Medicine, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Jeffrey R Mann
- Center for Comparative Medicine, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Mark T Kozlowski
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - David A Tirrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Farzad Esni
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Dannielle D Engle
- Regulatory Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Arthur D Riggs
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Hsun Teresa Ku
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- The Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA, USA
| |
Collapse
|
3
|
Zook HN, Quijano JC, Ortiz JA, Donohue C, Lopez K, Li W, Erdem N, Jou K, Crook CJ, Garcia I, Kandeel F, Montero E, Ku HT. Activation of ductal progenitor-like cells from adult human pancreas requires extracellular matrix protein signaling. iScience 2024; 27:109237. [PMID: 38433896 PMCID: PMC10904999 DOI: 10.1016/j.isci.2024.109237] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 12/22/2023] [Accepted: 02/09/2024] [Indexed: 03/05/2024] Open
Abstract
Ductal progenitor-like cells are a sub-population of ductal cells in the adult human pancreas that have the potential to contribute to regenerative medicine. However, the microenvironmental cues that regulate their activation are poorly understood. Here, we establish a 3-dimensional suspension culture system containing six defined soluble factors in which primary human ductal progenitor-like and ductal non-progenitor cells survive but do not proliferate. Expansion and polarization occur when suspension cells are provided with a low concentration (5% v/v) of Matrigel, a sarcoma cell product enriched in many extracellular matrix (ECM) proteins. Screening of ECM proteins identified that collagen IV can partially recapitulate the effects of Matrigel. Inhibition of integrin α1β1, a major collagen IV receptor, negates collagen IV- and Matrigel-stimulated effects. These results demonstrate that collagen IV is a key ECM protein that stimulates the expansion and polarization of human ductal progenitor-like and ductal non-progenitor cells via integrin α1β1 receptor signaling.
Collapse
Affiliation(s)
- Heather N. Zook
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Janine C. Quijano
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Jose A. Ortiz
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Cecile Donohue
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Kassandra Lopez
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Wendong Li
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Neslihan Erdem
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Kevin Jou
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Christiana J. Crook
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Isaac Garcia
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Enrique Montero
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Hsun Teresa Ku
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| |
Collapse
|
4
|
Breunig S, Quijano JC, Donohue C, Henrickson A, Demeler B, Ku HT, Tirrell DA. Incorporation of Aliphatic Proline Residues into Recombinantly Produced Insulin. ACS Chem Biol 2023; 18:2574-2581. [PMID: 37960878 PMCID: PMC10728891 DOI: 10.1021/acschembio.3c00561] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/24/2023] [Accepted: 10/27/2023] [Indexed: 11/15/2023]
Abstract
Analogs of proline can be used to expand the chemical space about the residue while maintaining its uniquely restricted conformational space. Here, we demonstrate the incorporation of 4R-methylproline, 4S-methylproline, and 4-methyleneproline into recombinant insulin expressed in Escherichia coli. These modified proline residues, introduced at position B28, change the biophysical properties of insulin: Incorporation of 4-methyleneproline at B28 accelerates fibril formation, while 4-methylation speeds dissociation from the pharmaceutically formulated hexamer. This work expands the scope of proline analogs amenable to incorporation into recombinant proteins and demonstrates how noncanonical amino acid mutagenesis can be used to engineer the therapeutically relevant properties of protein drugs.
Collapse
Affiliation(s)
- Stephanie
L. Breunig
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Janine C. Quijano
- Department
of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Institute City
of Hope, Duarte, California 91010, United States
| | - Cecile Donohue
- Department
of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Institute City
of Hope, Duarte, California 91010, United States
| | - Amy Henrickson
- Department
of Chemistry and Biochemistry, University
of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
| | - Borries Demeler
- Department
of Chemistry and Biochemistry, University
of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
- Department
of Chemistry and Biochemistry, University
of Montana, Missoula, Montana 59801, United States
| | - Hsun Teresa Ku
- Department
of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Institute City
of Hope, Duarte, California 91010, United States
- Irell &
Manella Graduate School of Biological Science, City of Hope, Duarte, California 91010, United
States
| | - David A. Tirrell
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| |
Collapse
|
5
|
Cobb J, Soliman SSM, Retuerto M, Quijano JC, Orr C, Ghannoum M, Kandeel F, Husseiny MI. Changes in the gut microbiota of NOD mice in response to an oral Salmonella-based vaccine against type 1 diabetes. PLoS One 2023; 18:e0285905. [PMID: 37224176 DOI: 10.1371/journal.pone.0285905] [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] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 05/03/2023] [Indexed: 05/26/2023] Open
Abstract
We developed an oral Salmonella-based vaccine that prevents and reverses diabetes in non-obese diabetic (NOD) mice. Related to this, the gastrointestinal tract harbors a complex dynamic population of microorganisms, the gut microbiome, that influences host homeostasis and metabolism. Changes in the gut microbiome are associated with insulin dysfunction and type 1 diabetes (T1D). Oral administration of diabetic autoantigens as a vaccine can restore immune balance. However, it was not known if a Salmonella-based vaccine would impact the gut microbiome. We administered a Salmonella-based vaccine to prediabetic NOD mice. Changes in the gut microbiota and associated metabolome were assessed using next-generation sequencing and gas chromatography-mass spectrometry (GC-MS). The Salmonella-based vaccine did not cause significant changes in the gut microbiota composition immediately after vaccination although at 30 days post-vaccination changes were seen. Additionally, no changes were noted in the fecal mycobiome between vaccine- and control/vehicle-treated mice. Significant changes in metabolic pathways related to inflammation and proliferation were found after vaccine administration. The results from this study suggest that an oral Salmonella-based vaccine alters the gut microbiome and metabolome towards a more tolerant composition. These results support the use of orally administered Salmonella-based vaccines that induced tolerance after administration.
Collapse
Affiliation(s)
- Jacob Cobb
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Sameh S M Soliman
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
- Department of Medicinal Chemistry, College of Pharmacy, University of Sharjah, Sharjah, United Arab Emirates
| | - Mauricio Retuerto
- Center for Medical Mycology, Department of Dermatology, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Janine C Quijano
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Chris Orr
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Mahmoud Ghannoum
- Center for Medical Mycology, Department of Dermatology, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Fouad Kandeel
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
| | - Mohamed I Husseiny
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, Beckman Research Institute, City of Hope National Medical Center, Duarte, California, United States of America
- Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| |
Collapse
|
6
|
Quijano JC, Wedeken L, Ortiz JA, Zook HN, LeBon JM, Luo A, Rawson J, Tremblay JR, Mares JM, Lopez K, Chen MH, Jou K, Mendez-Dorantes C, Al-Abdullah IH, Thurmond DC, Kandeel F, Riggs AD, Ku HT. Methylcellulose colony assay and single-cell micro-manipulation reveal progenitor-like cells in adult human pancreatic ducts. Stem Cell Reports 2023; 18:618-635. [PMID: 36868230 PMCID: PMC10031308 DOI: 10.1016/j.stemcr.2023.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 02/21/2022] [Revised: 01/31/2023] [Accepted: 02/01/2023] [Indexed: 03/05/2023] Open
Abstract
Progenitor cells capable of self-renewal and differentiation in the adult human pancreas are an under-explored resource for regenerative medicine. Using micro-manipulation and three-dimensional colony assays we identify cells within the adult human exocrine pancreas that resemble progenitor cells. Exocrine tissues were dissociated into single cells and plated into a colony assay containing methylcellulose and 5% Matrigel. A subpopulation of ductal cells formed colonies containing differentiated ductal, acinar, and endocrine lineage cells, and expanded up to 300-fold with a ROCK inhibitor. When transplanted into diabetic mice, colonies pre-treated with a NOTCH inhibitor gave rise to insulin-expressing cells. Both colonies and primary human ducts contained cells that simultaneously express progenitor transcription factors SOX9, NKX6.1, and PDX1. In addition, in silico analysis identified progenitor-like cells within ductal clusters in a single-cell RNA sequencing dataset. Therefore, progenitor-like cells capable of self-renewal and tri-lineage differentiation either pre-exist in the adult human exocrine pancreas, or readily adapt in culture.
Collapse
Affiliation(s)
- Janine C Quijano
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA.
| | - Lena Wedeken
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jose A Ortiz
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Heather N Zook
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Jeanne M LeBon
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Angela Luo
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jeffrey Rawson
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jacob R Tremblay
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jacob M Mares
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Kassandra Lopez
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Min-Hsuan Chen
- Integrative Genomics Core, City of Hope, Duarte, CA 91010, USA
| | - Kevin Jou
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Carlos Mendez-Dorantes
- Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Ismail H Al-Abdullah
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Debbie C Thurmond
- Department of Molecular & Cellular Endocrinology, City of Hope, Duarte, CA 91010, USA
| | - Fouad Kandeel
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Department of Clinical Diabetes, Endocrinology & Metabolism, City of Hope, Duarte, CA 91010, USA
| | - Arthur D Riggs
- Department of Diabetes & Drug Discovery, City of Hope, Duarte, CA 91010, USA
| | - Hsun Teresa Ku
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| |
Collapse
|
7
|
Quijano JC, Raynaud F, Nguyen D, Piacentini N, Meister JJ. Intercellular ultrafast Ca(2+) wave in vascular smooth muscle cells: numerical and experimental study. Sci Rep 2016; 6:31271. [PMID: 27507785 PMCID: PMC4978975 DOI: 10.1038/srep31271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 04/20/2016] [Accepted: 07/06/2016] [Indexed: 01/08/2023] Open
Abstract
Vascular smooth muscle cells exhibit intercellular Ca2+ waves in response to local mechanical or KCl stimulation. Recently, a new type of intercellular Ca2+ wave was observed in vitro in a linear arrangement of smooth muscle cells. The intercellular wave was denominated ultrafast Ca2+ wave and it was suggested to be the result of the interplay between membrane potential and Ca2+ dynamics which depended on influx of extracellular Ca2+, cell membrane depolarization and its intercel- lular propagation. In the present study we measured experimentally the conduction velocity of the membrane depolarization and performed simulations of the ultrafast Ca2+ wave along coupled smooth muscle cells. Numerical results reproduced a wide spectrum of experimental observations, including Ca2+ wave velocity, electrotonic membrane depolarization along the network, effects of inhibitors and independence of the Ca2+ wave speed on the intracellular stores. The numerical data also provided new physiological insights suggesting ranges of crucial model parameters that may be altered experimentally and that could significantly affect wave kinetics allowing the modulation of the wave characteristics experimentally. Numerical and experimental results supported the hypothesis that the propagation of membrane depolarization acts as an intercellular messenger mediating intercellular ultrafast Ca2+ waves in smooth muscle cells.
Collapse
Affiliation(s)
- J C Quijano
- Laboratory of Cell Biophysics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Facultad de Ciencias Básicas, Politécnico Colombiano JIC, Medellín, Colombia
| | - F Raynaud
- Laboratory of Cell Biophysics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Computational Systems Oncology, Department of Computational Biology, University of Lausanne, Lausanne, Switzerland
| | - D Nguyen
- Laboratory of Cell Biophysics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - N Piacentini
- Laboratory of Cell Biophysics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - J J Meister
- Laboratory of Cell Biophysics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| |
Collapse
|
8
|
Quijano JC, Wisotzkey RG, Tran NL, Huang Y, Stinchfield MJ, Haerry TE, Shimmi O, Newfeld SJ. lolal Is an Evolutionarily New Epigenetic Regulator of dpp Transcription during Dorsal-Ventral Axis Formation. Mol Biol Evol 2016; 33:2621-32. [PMID: 27401231 PMCID: PMC5026256 DOI: 10.1093/molbev/msw132] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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] [Indexed: 02/07/2023] Open
Abstract
Secreted ligands in the Dpp/BMP family drive dorsal–ventral (D/V) axis formation in all Bilaterian species. However, maternal factors regulating Dpp/BMP transcription in this process are largely unknown. We identified the BTB domain protein longitudinals lacking-like (lolal) as a modifier of decapentaplegic (dpp) mutations. We show that Lolal is evolutionarily related to the Trithorax group of chromatin regulators and that lolal interacts genetically with the epigenetic factor Trithorax-like during Dpp D/V signaling. Maternally driven LolalHA is found in oocytes and translocates to zygotic nuclei prior to the point at which dpp transcription begins. lolal maternal and zygotic mutant embryos display significant reductions in dpp, pMad, and zerknullt expression, but they are never absent. The data suggest that lolal is required to maintain dpp transcription during D/V patterning. Phylogenetic data revealed that lolal is an evolutionarily new gene present only in insects and crustaceans. We conclude that Lolal is the first maternal protein identified with a role in dpp D/V transcriptional maintenance, that Lolal and the epigenetic protein Trithorax-like are essential for Dpp D/V signaling and that the architecture of the Dpp D/V pathway evolved in the arthropod lineage after the separation from vertebrates via the incorporation of new genes such as lolal.
Collapse
Affiliation(s)
| | | | | | - Yunxian Huang
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | | | - Theodor E Haerry
- Center for Molecular Biology and Biotechnology, Florida Atlantic University
| | - Osamu Shimmi
- Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | | |
Collapse
|
9
|
Tremblay JR, LeBon JM, Luo A, Quijano JC, Wedeken L, Jou K, Riggs AD, Tirrell DA, Ku HT. In Vitro Colony Assays for Characterizing Tri-potent Progenitor Cells Isolated from the Adult Murine Pancreas. J Vis Exp 2016. [PMID: 27340914 DOI: 10.3791/54016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Stem and progenitor cells from the adult pancreas could be a potential source of therapeutic beta-like cells for treating patients with type 1 diabetes. However, it is still unknown whether stem and progenitor cells exist in the adult pancreas. Research strategies using cre-lox lineage-tracing in adult mice have yielded results that either support or refute the idea that beta cells can be generated from the ducts, the presumed location where adult pancreatic progenitors may reside. These in vivo cre-lox lineage-tracing methods, however, cannot answer the questions of self-renewal and multi-lineage differentiation-two criteria necessary to define a stem cell. To begin addressing this technical gap, we devised 3-dimensional colony assays for pancreatic progenitors. Soon after our initial publication, other laboratories independently developed a similar, but not identical, method called the organoid assay. Compared to the organoid assay, our method employs methylcellulose, which forms viscous solutions that allow the inclusion of extracellular matrix proteins at low concentrations. The methylcellulose-containing assays permit easier detection and analyses of progenitor cells at the single-cell level, which are critical when progenitors constitute a small sub-population, as is the case for many adult organ stem cells. Together, results from several laboratories demonstrate in vitro self-renewal and multi-lineage differentiation of pancreatic progenitor-like cells from mice. The current protocols describe two methylcellulose-based colony assays to characterize mouse pancreatic progenitors; one contains a commercial preparation of murine extracellular matrix proteins and the other an artificial extracellular matrix protein known as a laminin hydrogel. The techniques shown here are 1) dissociation of the pancreas and sorting of CD133(+)Sox9/EGFP(+) ductal cells from adult mice, 2) single cell manipulation of the sorted cells, 3) single colony analyses using microfluidic qRT-PCR and whole-mount immunostaining, and 4) dissociation of primary colonies into single-cell suspensions and re-plating into secondary colony assays to assess self-renewal or differentiation.
Collapse
Affiliation(s)
- Jacob R Tremblay
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope; Irell & Manella Graduate School of Biological Sciences, Beckman Research Institute of City of Hope
| | - Jeanne M LeBon
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - Angela Luo
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - Janine C Quijano
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - Lena Wedeken
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - Kevin Jou
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - Arthur D Riggs
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope
| | - David A Tirrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology
| | - H Teresa Ku
- Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope;
| |
Collapse
|
10
|
Jin L, Gao D, Feng T, Tremblay JR, Ghazalli N, Luo A, Rawson J, Quijano JC, Chai J, Wedeken L, Hsu J, LeBon J, Walker S, Shih HP, Mahdavi A, Tirrell DA, Riggs AD, Ku HT. Cells with surface expression of CD133highCD71low are enriched for tripotent colony-forming progenitor cells in the adult murine pancreas. Stem Cell Res 2015; 16:40-53. [PMID: 26691820 DOI: 10.1016/j.scr.2015.11.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 11/07/2015] [Accepted: 11/25/2015] [Indexed: 01/15/2023] Open
Abstract
Progenitor cells in the adult pancreas are potential sources of endocrine beta cells for treating type 1 diabetes. Previously, we identified tri-potent progenitor cells in the adult (2-4month-old) murine pancreas that were capable of self-renewal and differentiation into duct, acinar, and endocrine cells in vitro. These progenitor cells were named pancreatic colony-forming units (PCFUs). However, because PCFUs are a minor population in the pancreas (~1%) they are difficult to study. To enrich PCFUs, strategies using cell-surface marker analyses and fluorescence-activated cell sorting were developed. We found that CD133(high)CD71(low) cells, but not other cell populations, enriched PCFUs by up to 30 fold compared to the unsorted cells. CD133(high)CD71(low) cells generated primary, secondary, and subsequent colonies when serially re-plated in Matrigel-containing cultures, suggesting self-renewal abilities. In the presence of a laminin hydrogel, CD133(high)CD71(low) cells gave rise to colonies that contained duct, acinar, and Insulin(+)Glucagon(+) double-hormonal endocrine cells. Colonies from the laminin hydrogel culture were implanted into diabetic mice, and five weeks later duct, acinar, and Insulin(+)Glucagon(-) cells were detected in the grafts, demonstrating tri-lineage differentiation potential of CD133(high)CD71(low) cells. These CD133(high)CD71(low) cells will enable future studies of putative adult pancreas stem cells in vivo.
Collapse
Affiliation(s)
- Liang Jin
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States; State Key Laboratory of Natural Medicines, Biopharmaceutical College, China Pharmaceutical University, Tongjia Xiang 24, Nanjing, 210009, People's Republic of China
| | - Dan Gao
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Tao Feng
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Jacob R Tremblay
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Irell & Manella Graduate School of Biological Sciences, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Nadiah Ghazalli
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Irell & Manella Graduate School of Biological Sciences, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Angela Luo
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Jeffrey Rawson
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Janine C Quijano
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Jing Chai
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Lena Wedeken
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Jasper Hsu
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Jeanne LeBon
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Stephanie Walker
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Hung-Ping Shih
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Irell & Manella Graduate School of Biological Sciences, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - Alborz Mahdavi
- Department of Bioengineering, California Institute of Technology, Pasadena, CA 91125, United States
| | - David A Tirrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, United States
| | - Arthur D Riggs
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Irell & Manella Graduate School of Biological Sciences, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States
| | - H Teresa Ku
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Duarte, CA 91010, United States; Irell & Manella Graduate School of Biological Sciences, Duarte, CA 91010, United States; Beckman Research Institute of City of Hope, Duarte, CA 91010, United States.
| |
Collapse
|
11
|
Wisotzkey RG, Quijano JC, Stinchfield MJ, Newfeld SJ. New gene evolution in the bonus-TIF1-γ/TRIM33 family impacted the architecture of the vertebrate dorsal-ventral patterning network. Mol Biol Evol 2014; 31:2309-21. [PMID: 24881051 DOI: 10.1093/molbev/msu175] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Uncovering how a new gene acquires its function and understanding how the function of a new gene influences existing genetic networks are important topics in evolutionary biology. Here, we demonstrate nonconservation for the embryonic functions of Drosophila Bonus and its newest vertebrate relative TIF1-γ/TRIM33. We showed previously that TIF1-γ/TRIM33 functions as an ubiquitin ligase for the Smad4 signal transducer and antagonizes the Bone Morphogenetic Protein (BMP) signaling network underlying vertebrate dorsal-ventral axis formation. Here, we show that Bonus functions as an agonist of the Decapentaplegic (Dpp) signaling network underlying dorsal-ventral axis formation in flies. The absence of conservation for the roles of Bonus and TIF1-γ/TRIM33 reveals a shift in the dorsal-ventral patterning networks of flies and mice, systems that were previously considered wholly conserved. The shift occurred when the new gene TIF1-γ/TRIM33 replaced the function of the ubiquitin ligase Nedd4L in the lineage leading to vertebrates. Evidence of this replacement is our demonstration that Nedd4 performs the function of TIF1-γ/TRIM33 in flies during dorsal-ventral axis formation. The replacement allowed vertebrate Nedd4L to acquire novel functions as a ubiquitin ligase of vertebrate-specific Smad proteins. Overall our data reveal that the architecture of the Dpp/BMP dorsal-ventral patterning network continued to evolve in the vertebrate lineage, after separation from flies, via the incorporation of new genes.
Collapse
Affiliation(s)
- Robert G Wisotzkey
- Department of Biological Sciences, California State University, East Bay
| | - Janine C Quijano
- Department of Biological Sciences, California State University, East BaySchool of Life Sciences, Arizona State University
| | | | | |
Collapse
|
12
|
Takaesu NT, Stinchfield MJ, Shimizu K, Arase M, Quijano JC, Watabe T, Miyazono K, Newfeld SJ. Drosophila CORL is required for Smad2-mediated activation of Ecdysone Receptor expression in the mushroom body. Development 2012; 139:3392-401. [PMID: 22874913 DOI: 10.1242/dev.079442] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
CORL proteins (FUSSEL/SKOR proteins in humans) are related to Sno/Ski oncogenes but their developmental roles are unknown. We have cloned Drosophila CORL and show that its expression is restricted to distinct subsets of cells in the central nervous system. We generated a deletion of CORL and noted that homozygous individuals rarely survive to adulthood. Df(4)dCORL adult escapers display mushroom body (MB) defects and Df(4)dCORL larvae are lacking Ecdysone Receptor (EcR-B1) expression in MB neurons. This is phenocopied in CORL-RNAi and Smad2-RNAi clones in wild-type larvae. Furthermore, constitutively active Baboon (type I receptor upstream of Smad2) cannot stimulate EcR-B1 MB expression in Df(4)dCORL larvae, which demonstrates a formal requirement for CORL in Smad2 signaling. Studies of mouse Corl1 (Skor1) revealed that it binds specifically to Smad3. Overall, the data suggest that CORL facilitates Smad2 activity upstream of EcR-B1 in the MB. The conservation of neural expression and strong sequence homology of all CORL proteins suggests that this is a new family of Smad co-factors.
Collapse
Affiliation(s)
- Norma T Takaesu
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Stinchfield MJ, Takaesu NT, Quijano JC, Castillo AM, Tiusanen N, Shimmi O, Enzo E, Dupont S, Piccolo S, Newfeld SJ. Fat facets deubiquitylation of Medea/Smad4 modulates interpretation of a Dpp morphogen gradient. Development 2012; 139:2721-9. [PMID: 22745309 DOI: 10.1242/dev.077206] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The ability of secreted Transforming Growth Factor β (TGFβ) proteins to act as morphogens dictates that their influence be strictly regulated. Here, we report that maternally contributed fat facets (faf; a homolog of USP9X/FAM) is essential for proper interpretation of the zygotic Decapentaplegic (Dpp) morphogen gradient that patterns the embryonic dorsal-ventral axis. The data suggest that the loss of faf reduces the activity of Medea (a homolog of Smad4) below the minimum necessary for adequate Dpp signaling and that this is likely due to excessive ubiquitylation on a specific lysine. This study supports the hypothesis that the control of cellular responsiveness to TGFβ signals at the level of Smad4 ubiquitylation is a conserved mechanism required for proper implementation of a morphogen gradient.
Collapse
|
14
|
Quijano JC, Stinchfield MJ, Zerlanko B, Gibbens YY, Takaesu NT, Hyman-Walsh C, Wotton D, Newfeld SJ. The Sno oncogene antagonizes Wingless signaling during wing development in Drosophila. PLoS One 2010; 5:e11619. [PMID: 20661280 PMCID: PMC2905394 DOI: 10.1371/journal.pone.0011619] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Accepted: 06/15/2010] [Indexed: 11/18/2022] Open
Abstract
The Sno oncogene (Snoo or dSno in Drosophila) is a highly conserved protein and a well-established antagonist of Transforming Growth Factor-β signaling in overexpression assays. However, analyses of Sno mutants in flies and mice have proven enigmatic in revealing developmental roles for Sno proteins. Thus, to identify developmental roles for dSno we first reconciled conflicting data on the lethality of dSno mutations. Then we conducted analyses of wing development in dSno loss of function genotypes. These studies revealed ectopic margin bristles and ectopic campaniform sensilla in the anterior compartment of the wing blade suggesting that dSno functions to antagonize Wingless (Wg) signaling. A subsequent series of gain of function analyses yielded the opposite phenotype (loss of bristles and sensilla) and further suggested that dSno antagonizes Wg signal transduction in target cells. To date Sno family proteins have not been reported to influence the Wg pathway during development in any species. Overall our data suggest that dSno functions as a tissue-specific component of the Wg signaling pathway with modest antagonistic activity under normal conditions but capable of blocking significant levels of extraneous Wg, a role that may be conserved in vertebrates.
Collapse
Affiliation(s)
- Janine C. Quijano
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Michael J. Stinchfield
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Brad Zerlanko
- Department of Biochemistry and Molecular Genetics, and Center for Cell Signaling, University of Virginia, Charlottesville, Virginia, United States of America
| | - Ying Y. Gibbens
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Norma T. Takaesu
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Cathy Hyman-Walsh
- Department of Biochemistry and Molecular Genetics, and Center for Cell Signaling, University of Virginia, Charlottesville, Virginia, United States of America
| | - David Wotton
- Department of Biochemistry and Molecular Genetics, and Center for Cell Signaling, University of Virginia, Charlottesville, Virginia, United States of America
| | - Stuart J. Newfeld
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
- * E-mail:
| |
Collapse
|