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Bechard ME, Glass SE, Coffey RJ. Abstract B030: Dipeptidase-1 is a highly upregulated protein in CRC exosomes: Potential clinical relevance. Cancer Res 2022. [DOI: 10.1158/1538-7445.crc22-b030] [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] [Indexed: 12/05/2022]
Abstract
Abstract
Bert Vogelstein and co-workers identified DPEP1 in 2001 as one of the top six upregulated genes encoding a membrane or secreted protein in colorectal adenomas and cancers (CRCs). DPEP1 is a GPI-linked, zinc-dependent dipeptidase whose enzymatic activity includes processing extracellular glutathione and converting LTD4 to LTE4. Recently, it was reported to act nonenzymatically as a receptor for neutrophils on liver and lung endothelial cells and to influence monocyte migration. DPEP1 has been reported to have roles in cancer proliferation, invasion and metastasis. We recently showed that DPEP1 is the most abundant protein in small extracellular vesicles (sEVs) released from CRC cell lines by mass spectrometry and is present in a subset of EGFR+/CD81+ exosomes along with other clinically relevant biomarkers by fluorescence-activated vesicle sorting (FAVS) (Q Zhang et al., Nature Cell Biology 23:1240-1254, 2021). We also found that DPEP1/CEACAM5 double-positive exosomes are increased in the plasma from three CRC patients compared to normal controls. Immunohistochemical staining for DPEP1 in clinically well-annotated adenoma and CRC tissue microarrays has revealed staining in 27% of adenomas and 71% of CRCs, whereas no staining was observed in normal colonic tissue. Moreover, diffuse cytoplasmic staining in CRCs was associated with a worse progression-free and overall survival. We have now generated adenoma organoids, some of which express endogenous DPEP1 that localizes to the apical plasma membrane in 3D organoids and when cultured as polarized monolayers on Transwell filters. We plan to examine the bi-directional effects of cellular DPEP1 and DPEP1-containing EVs and freshly isolated neutrophils and/or their EVs in a co-culture system that is part of our recently funded Translational and Biological Science in Early Lesions (TBEL) NCI U54 grant.
Citation Format: Matthew E. Bechard, Sarah E. Glass, Robert J. Coffey. Dipeptidase-1 is a highly upregulated protein in CRC exosomes: Potential clinical relevance [abstract]. In: Proceedings of the AACR Special Conference on Colorectal Cancer; 2022 Oct 1-4; Portland, OR. Philadelphia (PA): AACR; Cancer Res 2022;82(23 Suppl_1):Abstract nr B030.
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Smalling RV, Bechard ME, Duryea J, Kingsley PJ, Roberts ER, Marnett LJ, Bilbao D, Stauffer SR, McDonald OG. Aminopyridine analogs selectively target metastatic pancreatic cancer. Oncogene 2022; 41:1518-1525. [PMID: 35031771 DOI: 10.1038/s41388-022-02183-3] [Citation(s) in RCA: 1] [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] [Received: 07/14/2021] [Revised: 12/17/2021] [Accepted: 01/07/2022] [Indexed: 12/20/2022]
Abstract
Metastatic outgrowth is supported by metabolic adaptations that may differ from the primary tumor of origin. However, it is unknown if such adaptations are therapeutically actionable. Here we report a novel aminopyridine compound that targets a unique Phosphogluconate Dehydrogenase (PGD)-dependent metabolic adaptation in distant metastases from pancreatic cancer patients. Compared to structurally similar analogs, 6-aminopicolamine (6AP) potently and selectively reversed PGD-dependent metastatic properties, including intrinsic tumorigenic capacity, excess glucose consumption, and global histone hyperacetylation. 6AP acted as a water-soluble prodrug that was converted into intracellular bioactive metabolites that inhibited PGD in vitro, and 6AP monotherapy demonstrated anti-metastatic efficacy with minimal toxicity in vivo. Collectively, these studies identify 6AP and possibly other 6-aminopyridines as well-tolerated prodrugs with selectivity for metastatic pancreatic cancers. If unique metabolic adaptations are a common feature of metastatic or otherwise aggressive human malignancies, then such dependencies could provide a largely untapped pool of druggable targets for patients with advanced cancers.
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Affiliation(s)
- Rana V Smalling
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Matthew E Bechard
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Jeff Duryea
- Department of Pathology and Laboratory Medicine, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Philip J Kingsley
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Evan R Roberts
- Department of Pathology and Laboratory Medicine, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Lawrence J Marnett
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Daniel Bilbao
- Department of Pathology and Laboratory Medicine, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Shaun R Stauffer
- Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA.,Center for Therapeutics Discovery, Cleveland Clinic, Cleveland, OH, USA
| | - Oliver G McDonald
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA. .,Department of Pathology and Laboratory Medicine, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA.
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Abstract
Our organoid generation technique has allowed for the development of downstream organoid applications. Here, we detail an accessible, straightforward protocol for immunofluorescent staining and imaging of thyroid cancer organoids, particularly those with tumor de-differentiation. Immunofluorescence is a powerful tool to help understand the localization of cell types within organoids and determine the interactions between those cells. As organoids have been shown to recapitulate patient tumor morphology, immunofluorescent staining and imaging of organoids allows for enhanced understanding of near in vivo structures. For complete details on the use and execution of this protocol, please refer to Lee et al. (2020) and Vilgelm et al. (2020).
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Affiliation(s)
- Kensey N. Bergdorf
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
| | - Courtney J. Phifer
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Matthew E. Bechard
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Mason A. Lee
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Oliver G. McDonald
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Pathology, Sylvester Comprehensive Cancer Center, University of Miami, Miami, FL 33136, USA
| | - Ethan Lee
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Vivian L. Weiss
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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4
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Abstract
Patient-derived tumor organoid cultures are an essential and innovative methodology for translational research. However, current techniques to establish these cultures are cumbersome, expensive, and often require irreplaceable clinical tissue from surgery or core biopsies. Fine-needle aspiration (FNA) provides a minimally invasive biopsy technique commonly performed in clinical settings. Here, we provide a protocol for FNA. We have found that FNA provides a cost-effective, rapid, and streamlined method for tissue acquisition for cancer organoid culture. For complete details on the use and execution of this protocol, please refer to Lee et al. (2020) and Vilgelm et al. (2020).
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Affiliation(s)
- Courtney J. Phifer
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Kensey N. Bergdorf
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
| | - Matthew E. Bechard
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Anna Vilgelm
- Department of Pathology, Ohio State University, Columbus, OH 43210, USA
| | - Naira Baregamian
- Department of Surgery, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Oliver G. McDonald
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Ethan Lee
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Cell and Developmental Biology, Nashville, TN 37232, USA
| | - Vivian L. Weiss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA
- Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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Bechard ME, Smalling R, Hayashi A, Zhong Y, Word AE, Campbell SL, Tran AV, Weiss VL, Iacobuzio-Donahue C, Wellen KE, McDonald OG. Pancreatic cancers suppress negative feedback of glucose transport to reprogram chromatin for metastasis. Nat Commun 2020; 11:4055. [PMID: 32792504 PMCID: PMC7426874 DOI: 10.1038/s41467-020-17839-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 07/21/2020] [Indexed: 12/14/2022] Open
Abstract
Although metastasis is the most common cause of cancer deaths, metastasis-intrinsic dependencies remain largely uncharacterized. We previously reported that metastatic pancreatic cancers were dependent on the glucose-metabolizing enzyme phosphogluconate dehydrogenase (PGD). Surprisingly, PGD catalysis was constitutively elevated without activating mutations, suggesting a non-genetic basis for enhanced activity. Here we report a metabolic adaptation that stably activates PGD to reprogram metastatic chromatin. High PGD catalysis prevents transcriptional up-regulation of thioredoxin-interacting protein (TXNIP), a gene that negatively regulates glucose import. This allows glucose consumption rates to rise in support of PGD, while simultaneously facilitating epigenetic reprogramming through a glucose-fueled histone hyperacetylation pathway. Restoring TXNIP normalizes glucose consumption, lowers PGD catalysis, reverses hyperacetylation, represses malignant transcripts, and impairs metastatic tumorigenesis. We propose that PGD-driven suppression of TXNIP allows pancreatic cancers to avidly consume glucose. This renders PGD constitutively activated and enables metaboloepigenetic selection of additional traits that increase fitness along glucose-replete metastatic routes.
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Affiliation(s)
- Matthew E Bechard
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Rana Smalling
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Akimasa Hayashi
- David M. Rubenstein Center for Pancreatic Cancer Research, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Yi Zhong
- David M. Rubenstein Center for Pancreatic Cancer Research, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Anna E Word
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Sydney L Campbell
- Department of Cancer Biology, Abramson Cancer Family Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Amanda V Tran
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Vivian L Weiss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Christine Iacobuzio-Donahue
- David M. Rubenstein Center for Pancreatic Cancer Research, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Kathryn E Wellen
- Department of Cancer Biology, Abramson Cancer Family Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Oliver G McDonald
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.
- Epithelial Biology Center; Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA.
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Bechard ME, Farahani P, Greene D, Pham A, Orry A, Rasche ME. Purification, kinetic characterization, and site-directed mutagenesis of Methanothermobacter thermautotrophicus RFAP Synthase Produced in Escherichia coli. AIMS Microbiol 2019; 5:186-204. [PMID: 31663056 PMCID: PMC6787355 DOI: 10.3934/microbiol.2019.3.186] [Citation(s) in RCA: 3] [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] [Received: 05/02/2019] [Accepted: 07/15/2019] [Indexed: 11/18/2022] Open
Abstract
Methane-producing archaea are among a select group of microorganisms that utilize tetrahydromethanopterin (H4MPT) as a one-carbon carrier instead of tetrahydrofolate. In H4MPT biosynthesis, β-ribofuranosylaminobenzene 5'-phosphate (RFAP) synthase catalyzes the production of RFAP, CO2, and pyrophosphate from p-aminobenzoic acid (pABA) and phosphoribosyl-pyrophosphate (PRPP). In this work, to gain insight into amino acid residues required for substrate binding, RFAP synthase from Methanothermobacter thermautotrophicus was produced in Escherichia coli, and site-directed mutagenesis was used to alter arginine 26 (R26) and aspartic acid 19 (D19), located in a conserved sequence of amino acids resembling the pABA binding site of dihydropteroate synthase. Replacement of R26 with lysine increased the KM for pABA by an order of magnitude relative to wild-type enzyme without substantially altering the KM for PRPP. Although replacement of D19 with alanine produced inactive enzyme, asparagine substitution allowed retention of some activity, and the K M for pABA increased about threefold relative to wild-type enzyme. A molecular model developed by threading RFAP synthase onto the crystal structure of homoserine kinase places R26 in the proposed active site. In the static model, D19 is located close to the active site, yet appears too far away to influence ligand binding directly. This may be indicative of the protein conformational change predicted previously in the Bi-Ter kinetic mechanism and/or formation of the active site at the interface of two subunits. Due to the vital role of RFAP synthase in H4MPT biosynthesis, insights into the mode of substrate binding and mechanism could be beneficial for developing RFAP synthase inhibitors designed to reduce the production of methane as a greenhouse gas.
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Affiliation(s)
- Matthew E Bechard
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Payam Farahani
- Chemistry and Biochemistry Department, California State University at Fullerton, 800 North State College Blvd., Fullerton, CA 92834
| | - Dina Greene
- Northern California Regional Laboratories, The Permanente Medical Group, Berkeley, CA 94710
| | - Anna Pham
- Chemistry and Biochemistry Department, California State University at Fullerton, 800 North State College Blvd., Fullerton, CA 92834
| | - Andrew Orry
- Molsoft L.L.C., 11199 Sorrento Valley Road, S209, San Diego, CA 92121
| | - Madeline E Rasche
- Chemistry and Biochemistry Department, California State University at Fullerton, 800 North State College Blvd., Fullerton, CA 92834
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Bankaitis ED, Bechard ME, Gu G, Magnuson MA, Wright CVE. ROCK-nmMyoII, Notch and Neurog3 gene-dosage link epithelial morphogenesis with cell fate in the pancreatic endocrine-progenitor niche. Development 2018; 145:dev.162115. [PMID: 30126902 DOI: 10.1242/dev.162115] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 08/03/2018] [Indexed: 12/28/2022]
Abstract
During mouse pancreas organogenesis, endocrine cells are born from progenitors residing in an epithelial plexus niche. After a period in a lineage-primed Neurog3LO state, progenitors become endocrine committed via upregulation of Neurog3 We find that the Neurog3LO to Neurog3HI transition is associated with distinct stages of an epithelial egression process: narrowing the apical surface of the cell, basalward cell movement and eventual cell-rear detachment from the apical lumen surface to allow clustering as nascent islets under the basement membrane. Apical narrowing, basalward movement and Neurog3 transcriptional upregulation still occur without Neurog3 protein, suggesting that morphogenetic cues deployed within the plexus initiate endocrine commitment upstream or independently of Neurog3. Neurog3 is required for cell-rear detachment and complete endocrine-cell birth. The ROCK-nmMyoII pathway coordinates epithelial-cell morphogenesis and the progression through Neurog3-expressing states. NmMyoII is necessary for apical narrowing, basalward cell displacement and Neurog3 upregulation, but all three are limited by ROCK activity. We propose that ROCK-nmMyoII activity, Neurog3 gene-dose and Notch signaling integrate endocrine fate allocation with epithelial plexus growth and morphogenesis, representing a feedback control circuit that coordinates morphogenesis with lineage diversification in the endocrine-birth niche.
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Affiliation(s)
- Eric D Bankaitis
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Matthew E Bechard
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Guoqiang Gu
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Mark A Magnuson
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37232, USA
| | - Christopher V E Wright
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University, Nashville, TN 37232, USA
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Bechard ME, Word AE, Tran AV, Liu X, Locasale JW, McDonald OG. Pentose conversions support the tumorigenesis of pancreatic cancer distant metastases. Oncogene 2018; 37:5248-5256. [PMID: 29849117 PMCID: PMC6692915 DOI: 10.1038/s41388-018-0346-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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] [Received: 12/21/2017] [Revised: 04/17/2018] [Accepted: 05/11/2018] [Indexed: 12/14/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) adopts several unique metabolic strategies to support primary tumor growth. Whether additional metabolic strategies are adopted to support metastatic tumorigenesis is less clear. This could be particularly relevant for distant metastasis, which often follows a rapidly progressive clinical course. Here we report that PDAC distant metastases evolve a unique series of metabolic reactions to maintain activation of the anabolic glucose enzyme phosphogluconate dehydrogenase (PGD). PGD catalytic activity was recurrently elevated across distant metastases, and modulating PGD activity levels dictated tumorigenic capacity. Metabolomics data raised the possibility that distant metastases evolved a core pentose conversion pathway (PCP) that converted glucose-derived metabolites into PGD substrate, thereby hyperactivating the enzyme. Consistent with this, each individual metabolite in the PCP stimulated PGD catalysis in distant metastases, and knockdown of each individual PCP enzyme selectively impaired tumorigenesis. We propose that the PCP manufactures PGD substrate outside of the rate-limiting oxidative pentose phosphate pathway (oxPPP). This enables PGD-dependent tumorigenesis by providing adequate substrate to fuel high catalytic activity, and raises the possibility that PDAC distant metastases adopt their own unique metabolic strategies to support tumor growth.
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Affiliation(s)
- Matthew E Bechard
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Anna E Word
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Amanda V Tran
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Xiaojing Liu
- Duke Cancer Institute, Duke University School of Medicine, Durham, NC, USA
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC, USA
| | - Jason W Locasale
- Duke Cancer Institute, Duke University School of Medicine, Durham, NC, USA
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, NC, USA
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC, USA
| | - Oliver G McDonald
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.
- Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN, USA.
- Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA.
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Bechard ME, Bankaitis ED, Ustione A, Piston DW, Magnuson MA, Wright CVE. FUCCI tracking shows cell-cycle-dependent Neurog3 variation in pancreatic progenitors. Genesis 2018; 55. [PMID: 28772022 DOI: 10.1002/dvg.23050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 07/30/2017] [Indexed: 12/29/2022]
Abstract
During pancreas organogenesis, Neurog3HI endocrine-committing cells are generated from a population of Sox9+ mitotic progenitors with only a low level of Neurog3 transcriptional activity (Neurog3TA.LO ). Low-level Neurog3 protein, in Neurog3TA.LO cells, is required to maintain their mitotic endocrine-lineage-primed status. Herein, we describe a Neurog3-driven FUCCI cell-cycle reporter (Neurog3P2A.FUCCI ) derived from a Neurog3 BAC transgenic reporter that functions as a loxed cassette acceptor (LCA). In cycling Sox9+ Neurog3TA.LO progenitors, the majority of cells in S-G2 -M phases have undetectable levels of Neurog3 with increased expression of endocrine progenitor markers, while those in G1 have low Neurog3 levels with increased expression of endocrine differentiation markers. These findings support a model in which variations in Neurog3 protein levels are coordinated with cell-cycle phase progression in Neurog3TA.LO progenitors with entrance into G1 triggering a concerted effort, beyond increasing Neurog3 levels, to maintain an endocrine-lineage-primed state by initiating expression of the downstream endocrine differentiation program prior to endocrine-commitment.
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Affiliation(s)
- Matthew E Bechard
- Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Vanderbilt University Program in Developmental Biology, Nashville, Tennessee
| | - Eric D Bankaitis
- Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Vanderbilt University Program in Developmental Biology, Nashville, Tennessee
| | - Alessandro Ustione
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - David W Piston
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Mark A Magnuson
- Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Vanderbilt University Program in Developmental Biology, Nashville, Tennessee.,Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Christopher V E Wright
- Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Vanderbilt University Program in Developmental Biology, Nashville, Tennessee
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Affiliation(s)
- Matthew E Bechard
- a Vanderbilt University Program in Developmental Biology , Department of Cell and Developmental Biology , Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine , Nashville , TN , USA
| | - Christopher V E Wright
- a Vanderbilt University Program in Developmental Biology , Department of Cell and Developmental Biology , Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine , Nashville , TN , USA
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Bechard ME, Bankaitis ED, Hipkens SB, Ustione A, Piston DW, Yang YP, Magnuson MA, Wright CVE. Precommitment low-level Neurog3 expression defines a long-lived mitotic endocrine-biased progenitor pool that drives production of endocrine-committed cells. Genes Dev 2016; 30:1852-65. [PMID: 27585590 PMCID: PMC5024683 DOI: 10.1101/gad.284729.116] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 08/03/2016] [Indexed: 12/22/2022]
Abstract
Bechard et al. show that a cell population defined as Neurog3 transcriptionally active and Sox9+ and often containing nonimmunodetectable Neurog3 protein has a relatively high mitotic index and prolonged epithelial residency. They propose that this endocrine-biased mitotic progenitor state is functionally separated from a pro-ductal pool and endows them with long-term capacity to make endocrine fate-directed progeny. The current model for endocrine cell specification in the pancreas invokes high-level production of the transcription factor Neurogenin 3 (Neurog3) in Sox9+ bipotent epithelial cells as the trigger for endocrine commitment, cell cycle exit, and rapid delamination toward proto-islet clusters. This model posits a transient Neurog3 expression state and short epithelial residence period. We show, however, that a Neurog3TA.LO cell population, defined as Neurog3 transcriptionally active and Sox9+ and often containing nonimmunodetectable Neurog3 protein, has a relatively high mitotic index and prolonged epithelial residency. We propose that this endocrine-biased mitotic progenitor state is functionally separated from a pro-ductal pool and endows them with long-term capacity to make endocrine fate-directed progeny. A novel BAC transgenic Neurog3 reporter detected two types of mitotic behavior in Sox9+Neurog3TA.LO progenitors, associated with progenitor pool maintenance or derivation of endocrine-committed Neurog3HI cells, respectively. Moreover, limiting Neurog3 expression dramatically increased the proportional representation of Sox9+Neurog3TA.LO progenitors, with a doubling of its mitotic index relative to normal Neurog3 expression, suggesting that low Neurog3 expression is a defining feature of this cycling endocrine-biased state. We propose that Sox9+Neurog3TA.LO endocrine-biased progenitors feed production of Neurog3HI endocrine-committed cells during pancreas organogenesis.
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Affiliation(s)
- Matthew E Bechard
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Eric D Bankaitis
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Susan B Hipkens
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA; Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Alessandro Ustione
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - David W Piston
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Yu-Ping Yang
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Mark A Magnuson
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA; Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
| | - Christopher V E Wright
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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12
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Bankaitis ED, Bechard ME, Wright CVE. Feedback control of growth, differentiation, and morphogenesis of pancreatic endocrine progenitors in an epithelial plexus niche. Genes Dev 2016; 29:2203-16. [PMID: 26494792 PMCID: PMC4617982 DOI: 10.1101/gad.267914.115] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [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: 12/21/2022]
Abstract
In the mammalian pancreas, endocrine cells undergo lineage allocation upon emergence from a bipotent duct/endocrine progenitor pool, which resides in the "trunk epithelium." Major questions remain regarding how niche environments are organized within this epithelium to coordinate endocrine differentiation with programs of epithelial growth, maturation, and morphogenesis. We used EdU pulse-chase and tissue-reconstruction approaches to analyze how endocrine progenitors and their differentiating progeny are assembled within the trunk as it undergoes remodeling from an irregular plexus of tubules to form the eventual mature, branched ductal arbor. The bulk of endocrine progenitors is maintained in an epithelial "plexus state," which is a transient intermediate during epithelial maturation within which endocrine cell differentiation is continually robust and surprisingly long-lived. Within the plexus, local feedback effects derived from the differentiating and delaminating endocrine cells nonautonomously regulate the flux of endocrine cell birth as well as proliferative growth of the bipotent cell population using Notch-dependent and Notch-independent influences, respectively. These feedback effects in turn maintain the plexus state to ensure prolonged allocation of endocrine cells late into gestation. These findings begin to define a niche-like environment guiding the genesis of the endocrine pancreas and advance current models for how differentiation is coordinated with the growth and morphogenesis of the developing pancreatic epithelium.
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Affiliation(s)
- Eric D Bankaitis
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
| | - Matthew E Bechard
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
| | - Christopher V E Wright
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt Center for Stem Cell Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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Bechard ME, Chhatwal S, Garcia RE, Rasche ME. Application of a Colorimetric Assay to Identify Putative Ribofuranosylaminobenzene 5'-Phosphate Synthase Genes Expressed with Activity in Escherichia coli. Biol Proced Online 2003; 5:69-77. [PMID: 12734554 PMCID: PMC152576 DOI: 10.1251/bpo48] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2003] [Revised: 02/14/2003] [Accepted: 02/14/2003] [Indexed: 11/23/2022] Open
Abstract
Tetrahydromethanopterin (H(4)MPT) is a tetrahydrofolate analog originally discovered in methanogenic archaea, but later found in other archaea and bacteria. The extent to which H(4)MPT occurs among living organisms is unknown. The key enzyme which distinguishes the biosynthetic pathways of H(4)MPT and tetrahydrofolate is ribofuranosylaminobenzene 5'-phosphate synthase (RFAP synthase). Given the importance of RFAP synthase in H(4)MPT biosynthesis, the identification of putative RFAP synthase genes and measurement of RFAP synthase activity would provide an indication of the presence of H(4)MPT in untested microorganisms. Investigation of putative archaeal RFAP synthase genes has been hampered by the tendency of the resulting proteins to form inactive inclusion bodies in Escherichia coli. The current work describes a colorimetric assay for measuring RFAP synthase activity, and two modified procedures for expressing recombinant RFAP synthase genes to produce soluble, active enzyme. By lowering the incubation temperature during expression, RFAP synthase from Archaeoglobus fulgidus was produced in E. coli and purified to homogeneity. The production of active RFAP synthase from Methanothermobacter thermautotrophicus was achieved by coexpression of the gene MTH0830 with a molecular chaperone. This is the first direct biochemical identification of a methanogen gene that codes for an active RFAP synthase.
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Affiliation(s)
- Matthew E. Bechard
- Microbiology and Cell Science Department, University of Florida. Gainesville, FL 32611-0700. USA
| | - Sonya Chhatwal
- Microbiology and Cell Science Department, University of Florida. Gainesville, FL 32611-0700. USA
| | - Rosemarie E. Garcia
- Microbiology and Cell Science Department, University of Florida. Gainesville, FL 32611-0700. USA
| | - Madeline E. Rasche
- Microbiology and Cell Science Department, University of Florida. Gainesville, FL 32611-0700. USA
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