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Datta R, Gholampour MA, Yang CD, Volk R, Lin S, Podolsky MJ, Arnold T, Rieder F, Zaro BW, Verzi M, Lehner R, Abumrad N, Lizama CO, Atabai K. MFGE8 links absorption of dietary fatty acids with catabolism of enterocyte lipid stores through HNF4γ-dependent transcription of CES enzymes. Cell Rep 2023; 42:112249. [PMID: 36924494 PMCID: PMC10138282 DOI: 10.1016/j.celrep.2023.112249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 12/21/2022] [Accepted: 02/25/2023] [Indexed: 03/17/2023] Open
Abstract
Enterocytes modulate the extent of postprandial lipemia by storing dietary fats in cytoplasmic lipid droplets (cLDs). We have previously shown that the integrin ligand MFGE8 links absorption of dietary fats with activation of triglyceride (TG) hydrolases that catabolize cLDs for chylomicron production. Here, we identify CES1D as the key hydrolase downstream of the MFGE8-αvβ5 integrin pathway that regulates catabolism of diet-derived cLDs. Mfge8 knockout (KO) enterocytes have reduced CES1D transcript and protein levels and reduced protein levels of the transcription factor HNF4γ. Both Ces1d and Hnf4γ KO mice have decreased enterocyte TG hydrolase activity coupled with retention of TG in cLDs. Mechanistically, MFGE8-dependent fatty acid uptake through CD36 stabilizes HNF4γ protein level; HNF4γ then increases Ces1d transcription. Our work identifies a regulatory network that regulates the severity of postprandial lipemia by linking dietary fat absorption with protein stabilization of a transcription factor that increases expression of hydrolases responsible for catabolizing diet-derived cLDs.
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Affiliation(s)
- Ritwik Datta
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Mohammad A Gholampour
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Christopher D Yang
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Regan Volk
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Sinan Lin
- Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases and Surgery Institute, Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44106, USA
| | - Michael J Podolsky
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Thomas Arnold
- Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Florian Rieder
- Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases and Surgery Institute, Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44106, USA
| | - Balyn W Zaro
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | | | - Richard Lehner
- Department of Pediatrics, University of Alberta, Edmonton, AB T6G 1C9, Canada
| | - Nada Abumrad
- Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Carlos O Lizama
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Kamran Atabai
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA; Lung Biology Center, University of California, San Francisco, San Francisco, CA 94143, USA.
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Racioppo B, Qiu N, Adibekian A. Serine Hydrolase Activity‐Based Probes for use in Chemical Proteomics. Isr J Chem 2023. [DOI: 10.1002/ijch.202300016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Brittney Racioppo
- Department of Chemistry University of Illinois Chicago Chicago Illinois 60607 United States
- Skaggs Doctoral Program in the Chemical and Biological Sciences, Scripps Research La Jolla California 92037 United States
| | - Nan Qiu
- Department of Chemistry University of Illinois Chicago Chicago Illinois 60607 United States
- Skaggs Doctoral Program in the Chemical and Biological Sciences, Scripps Research La Jolla California 92037 United States
| | - Alexander Adibekian
- Department of Chemistry University of Illinois Chicago Chicago Illinois 60607 United States
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Honeder SE, Tomin T, Schinagl M, Pfleger R, Hoehlschen J, Darnhofer B, Schittmayer M, Birner‐Gruenberger R. Research Advances Through Activity‐Based Lipid Hydrolase Profiling. Isr J Chem 2023. [DOI: 10.1002/ijch.202200078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sophie Elisabeth Honeder
- Research and Diagnostic Institute of Pathology Medical University of Graz Stiftingtalstraße 6 8036 Graz Austria
| | - Tamara Tomin
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
| | - Maximilian Schinagl
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
| | - Raphael Pfleger
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
| | - Julia Hoehlschen
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
| | - Barbara Darnhofer
- Core Facility Mass Spectrometry Center for Medical Research Medical University of Graz Neue Stiftingtalstraße 24 8036 Graz Austria
| | - Matthias Schittmayer
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
| | - Ruth Birner‐Gruenberger
- Research and Diagnostic Institute of Pathology Medical University of Graz Stiftingtalstraße 6 8036 Graz Austria
- Institute of Chemical Technologies and Analytics University of Technology Vienna Getreidemarkt 9 1060 Wien Austria
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Kasperkiewicz P. Peptidyl Activity-Based Probes for Imaging Serine Proteases. Front Chem 2021; 9:639410. [PMID: 33996745 PMCID: PMC8117214 DOI: 10.3389/fchem.2021.639410] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 04/15/2021] [Indexed: 01/12/2023] Open
Abstract
Proteases catalyze the hydrolysis of peptide bonds. Products of this breakdown mediate signaling in an enormous number of biological processes. Serine proteases constitute the most numerous group of proteases, accounting for 40%, and they are prevalent in many physiological functions, both normal and disease-related functions, making them one of the most important enzymes in humans. The activity of proteases is controlled at the expression level by posttranslational modifications and/or endogenous inhibitors. The study of serine proteases requires specific reagents not only for detecting their activity but also for their imaging. Such tools include inhibitors or substrate-related chemical molecules that allow the detection of proteolysis and visual observation of active enzymes, thus facilitating the characterization of the activity of proteases in the complex proteome. Peptidyl activity-based probes (ABPs) have been extensively studied recently, and this review describes the basic principles in the design of peptide-based imaging agents for serine proteases, provides examples of activity-based probe applications and critically discusses their strengths, weaknesses, challenges and limitations.
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Affiliation(s)
- Paulina Kasperkiewicz
- Department of Chemical Biology and Bioimaging, Wroclaw University of Science and Technology, Wroclaw, Poland
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Bi H, Zhang C. Extrinsic factors associated with the response to immunotherapy in glioblastoma. Cancer Lett 2021; 511:47-55. [PMID: 33933551 DOI: 10.1016/j.canlet.2021.04.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/10/2021] [Accepted: 04/25/2021] [Indexed: 12/20/2022]
Abstract
Glioblastoma (GBM) is a heterogeneous and lethal brain tumor. Despite the success of immune checkpoint inhibitors against various malignancies, GBM remains largely refractory to treatment. The immune microenvironment of GBM is highly immunosuppressive, which poses a major hurdle for the success of immunotherapy. Obviously, except for the GBM cells itself, there are also extrinsic reasons for the lack of efficacy of immunotherapy. Accumulated evidence indicates that factors other than GBM cells determine the efficacy of immunotherapy. In this review, we first described the unique immune microenvironment of the brain, which must be considered when using immunotherapy in patients with GBM. Second, we also described the mechanisms by which different immune and non-immune cells in the GBM microenvironment affect the efficacy of immunotherapy. Furthermore, the impact of standard therapies on the response to immunotherapy was delineated. Finally, we briefly discussed strategies for resolving these problems and improving the efficacy of immunotherapy.
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Affiliation(s)
- Hongye Bi
- Department of Neurology, Tianjin Union Hospital, Tianjin, 300000, China
| | - Chunzhi Zhang
- Department of Radiation Oncology, Tianjin Hospital, Tianjin 300211, China.
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Research Supporting a Pilot Study of Metronomic Dapsone during Glioblastoma Chemoirradiation. Med Sci (Basel) 2021; 9:medsci9010012. [PMID: 33669324 PMCID: PMC7931060 DOI: 10.3390/medsci9010012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/13/2022] Open
Abstract
This short note presents previous research data supporting a pilot study of metronomic dapsone during the entire course of glioblastoma treatment. The reviewed data indicate that neutrophils are an integral part of human glioblastoma pathophysiology, contributing to or facilitating glioblastoma growth and treatment resistance. Neutrophils collect within glioblastoma by chemotaxis along several chemokine/cytokine gradients, prominently among which is interleukin-8. Old data from dermatology research has shown that the old and inexpensive generic drug dapsone inhibits neutrophils' chemotaxis along interleukin-8 gradients. It is on that basis that dapsone is used to treat neutrophilic dermatoses, for example, dermatitis herpetiformis, bullous pemphigoid, erlotinib-related rash, and others. The hypothesis of this paper is that dapsone will reduce glioblastomas' neutrophil accumulations by the same mechanisms by which it reduces dermal neutrophil accumulations in the neutrophilic dermatoses. Dapsone would thereby reduce neutrophils' contributions to glioblastoma growth. Dapsone is not an ideal drug, however. It generates methemoglobinemia that occasionally is symptomatic. This generation is reduced by concomitant use of the antacid drug cimetidine. Given the uniform lethality of glioblastoma as of 2020, the risks of dapsone 100 mg twice daily and cimetidine 400 mg twice daily is low enough to warrant a judicious pilot study.
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