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Alshamleh I, Kurrle N, Makowka P, Bhayadia R, Kumar R, Süsser S, Seibert M, Ludig D, Wolf S, Koschade SE, Stoschek K, Kreitz J, Fuhrmann DC, Toenges R, Notaro M, Comoglio F, Schuringa JJ, Berg T, Brüne B, Krause DS, Klusmann JH, Oellerich T, Schnütgen F, Schwalbe H, Serve H. PDP1 is a key metabolic gatekeeper and modulator of drug resistance in FLT3-ITD-positive acute myeloid leukemia. Leukemia 2023; 37:2367-2382. [PMID: 37935978 PMCID: PMC10681906 DOI: 10.1038/s41375-023-02041-5] [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: 03/08/2021] [Revised: 08/18/2023] [Accepted: 09/14/2023] [Indexed: 11/09/2023]
Abstract
High metabolic flexibility is pivotal for the persistence and therapy resistance of acute myeloid leukemia (AML). In 20-30% of AML patients, activating mutations of FLT3, specifically FLT3-ITD, are key therapeutic targets. Here, we investigated the influence of FLT3-ITD on AML metabolism. Nuclear Magnetic Resonance (NMR) profiling showed enhanced reshuffling of pyruvate towards the tricarboxylic acid (TCA) cycle, suggesting an increased activity of the pyruvate dehydrogenase complex (PDC). Consistently, FLT3-ITD-positive cells expressed high levels of PDP1, an activator of the PDC. Combining endogenous tagging of PDP1 with genome-wide CRISPR screens revealed that FLT3-ITD induces PDP1 expression through the RAS signaling axis. PDP1 knockdown resulted in reduced cellular respiration thereby impairing the proliferation of only FLT3-ITD cells. These cells continued to depend on PDP1, even in hypoxic conditions, and unlike FLT3-ITD-negative cells, they exhibited a rapid, PDP1-dependent revival of their respiratory capacity during reoxygenation. Moreover, we show that PDP1 modifies the response to FLT3 inhibition. Upon incubation with the FLT3 tyrosine kinase inhibitor quizartinib (AC220), PDP1 persisted or was upregulated, resulting in a further shift of glucose/pyruvate metabolism towards the TCA cycle. Overexpression of PDP1 enhanced, while PDP1 depletion diminished AC220 resistance in cell lines and peripheral blasts from an AC220-resistant AML patient in vivo. In conclusion, FLT3-ITD assures the expression of PDP1, a pivotal metabolic regulator that enhances oxidative glucose metabolism and drug resistance. Hence, PDP1 emerges as a potentially targetable vulnerability in the management of AML.
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Affiliation(s)
- Islam Alshamleh
- Center for Biomolecular Magnetic Resonance (BMRZ), Institute of Organic Chemistry and Chemical Biology, Goethe University Frankfurt, 60438, Frankfurt am Main, Germany
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Nina Kurrle
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Philipp Makowka
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Raj Bhayadia
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
- Department of Pediatrics, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Rahul Kumar
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, 60596, Frankfurt am Main, Germany
| | - Sebastian Süsser
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Marcel Seibert
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Damian Ludig
- Center for Biomolecular Magnetic Resonance (BMRZ), Institute of Organic Chemistry and Chemical Biology, Goethe University Frankfurt, 60438, Frankfurt am Main, Germany
| | - Sebastian Wolf
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Sebastian E Koschade
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Karoline Stoschek
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Johanna Kreitz
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Dominik C Fuhrmann
- Institute of Biochemistry I, Faculty of Medicine, Goethe University Frankfurt, 60590, Frankfurt am Main, Germany
| | - Rosa Toenges
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | | | | | - Jan Jacob Schuringa
- Department of Experimental Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Tobias Berg
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Centre for Discovery in Cancer Research and Department of Oncology, McMaster University, Hamilton, ON, Canada
| | - Bernhard Brüne
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
- Institute of Biochemistry I, Faculty of Medicine, Goethe University Frankfurt, 60590, Frankfurt am Main, Germany
- Project Group Translational Medicine and Pharmacology TMP, Fraunhofer Institute for Molecular Biology and Applied Ecology, 60596, Frankfurt am Main, Germany
| | - Daniela S Krause
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, 60596, Frankfurt am Main, Germany
- Georg-Speyer-Haus; German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jan-Henning Klusmann
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
- Department of Pediatrics, Goethe University Frankfurt, 60590, Frankfurt, Germany
| | - Thomas Oellerich
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany
| | - Frank Schnütgen
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany.
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany.
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany.
| | - Harald Schwalbe
- Center for Biomolecular Magnetic Resonance (BMRZ), Institute of Organic Chemistry and Chemical Biology, Goethe University Frankfurt, 60438, Frankfurt am Main, Germany.
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany.
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany.
| | - Hubert Serve
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, and German Cancer Research Center (DKFZ), Heidelberg, Germany.
- Department of Medicine, Hematology/Oncology, Goethe University Frankfurt, 60590, Frankfurt, Germany.
- Frankfurt Cancer Institute, Goethe University Frankfurt, 60596, Frankfurt, Germany.
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Zhou M, Zha F, Chen Y, Liu F, Zhou J, Long J, Luo W, Huang M, Zhang S, Luo D, Li W, Wang Y. Handgrip Strength-Related Factors Affecting Health Outcomes in Young Adults: Association with Cardiorespiratory Fitness. BIOMED RESEARCH INTERNATIONAL 2021; 2021:6645252. [PMID: 33969122 PMCID: PMC8084643 DOI: 10.1155/2021/6645252] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/22/2021] [Accepted: 04/09/2021] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Handgrip strength (HS) is a risk factor of all-cause mortality and cardiovascular diseases. However, the influencing factors and mechanisms contributing to this correlation remain unclear. Therefore, we aimed to explore factors related to HS and investigated the mechanism underlying its risk predictive value. METHODS This was a prospective, cross-sectional study. One hundred forty-five participants were recruited from December 2019 to November 2020. HS was measured using a hydraulic hand dynamometer and adjusted for body mass index (HSBMI) and body surface area (HSBSA). Body composition was assessed via bioimpedance spectroscopy. Physical fitness was measured using a cardiopulmonary exercise test system. Univariate, multiple linear regression analyses and receiver operator characteristic curve (ROC) were conducted to evaluate the associations between various participant characteristics and HS. RESULTS The average participant age was 21.68 ± 2.61 years (42.8% were male). We found positive correlations between HSBMI/HSBSA and VO2max, VEmax, Loadmax, and METmax in both sexes (p < 0.05). Lean-tissue, protein, total water, and inorganic salt percentages were positively correlated, and fat percentage was negatively correlated with HSBMI in men and with HSBMI and HSBSA in women (p < 0.05). Multiple regression revealed that VO2max was independently associated with HSBSA in both sexes (β = 0.215, 0.173; 95%confidence interval [CI] = 0.032 - 0.398, 0.026-0.321; p = 0.022, 0.022, respectively) and independently associated with HSBMI in women (β = 0.016, 95%CI = 0.004 - 0.029, p = 0.011). ROC analysis showed that HSBMI and HSBSA can moderately identify normal VO2max in men (area under curve [AUC] = 0.754, 0.769; p = 0.002, 0.001, respectively) and marginally identify normal VO2max in women (AUC = 0.643, 0.635; p = 0.029, 0.042, respectively). CONCLUSIONS BMI- and BSA-adjusted HS could serve as indicators of physical health, and HSBSA may moderately reflect cardiorespiratory fitness levels in healthy young adults, particularly in males. Clinical trials registry site and number: China Clinical Trial Center (ChiCTR1900028228).
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Affiliation(s)
- Mingchao Zhou
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Fubing Zha
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Yuan Chen
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen, Guangdong, Medical College, Shantou University, Shantou, Guangdong, China
| | - Fang Liu
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Jing Zhou
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Jianjun Long
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Wei Luo
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Meiling Huang
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Shaohua Zhang
- Shenzhen Dapeng New District Nan'ao People's Hospital, Shenzhen, China
| | - Donglan Luo
- Shenzhen Dapeng New District Nan'ao People's Hospital, Shenzhen, China
| | - Weihao Li
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Yulong Wang
- The First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
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Sulaeman A, Fine J, de Vargas-Machuca A, Vitorino SA, Wagner PD, Fruttiger M, Breen EC. Synergistic effect of vascular endothelial growth factor gene inactivation in endothelial cells and skeletal myofibres on muscle enzyme activity, capillary supply and endurance exercise in mice. Exp Physiol 2020; 105:2168-2177. [PMID: 32936962 DOI: 10.1113/ep088924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 09/15/2020] [Indexed: 12/18/2022]
Abstract
NEW FINDINGS What is the central question of this study? Does vascular endothelial growth factor (VEGF) expressed by both endothelial cells and skeletal myofibres maintain the number of skeletal muscle capillaries and regulate endurance exercise? What is the main finding and its importance? VEGF expressed by both endothelial cells and skeletal myofibres is not essential for maintaining capillary number but does contribute to exercise performance. ABSTRACT Many chronic diseases lead to exercise intolerance, with loss of skeletal muscle capillaries. While many muscle cell types (myofibres, satellite cells, endothelial cells, macrophages and fibroblasts) express vascular endothelial growth factor (VEGF), most muscle VEGF is stored in myofibre vesicles which can release VEGF to signal VEGF receptor-expressing cells. VEGF gene ablation in myofibres or endothelial cells alone does not cause capillary regression. We hypothesized that simultaneously deleting the endothelial cell (EC) and skeletal myofibre (Skm) VEGF gene would cause capillary regression and impair exercise performance. This was tested in adult mice by simultaneous conditional deletion of the VEGF gene (Skm/EC-VEGF-/- mice) through the use of VEGFLoxP, HSA-Cre-ERT2 and PDGFb-iCre-ERT2 transgenes. These double-deletion mice were compared to three control groups - WT, EC VEGF gene deletion alone and myofibre VEGF gene deletion alone. Three weeks after initiating gene deletion, Skm/EC-VEGF-/- mice, but not SkmVEGF-/- or EC-VEGF-/- mice, reached exhaustion 40 min sooner than WT mice in treadmill tests (P = 0.002). WT, SkmVEGF-/- and EC-VEGF-/- , but not Skm/EC-VEGF-/- , mice gained weight over the 3 weeks. Capillary density, fibre area and capillary: fibre ratio in soleus, plantaris, gastrocnemius and cardiac papillary muscle were similar across the groups. Phosphofructokinase and pyruvate dehydrogenase activities increased only in Skm/EC-VEGF-/- mice. These data suggest that deletion of the VEGF gene simultaneously in endothelial cells and myofibres, while reducing treadmill endurance and despite compensatory augmentation of glycolysis, is not required for muscle capillary maintenance. Reduced endurance remains unexplained, but may possibly be related to a role for VEGF in controlling perfusion of contracting muscle.
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Affiliation(s)
- Alexis Sulaeman
- Department of Medicine, University of California, San Diego, CA, USA
| | - Janelle Fine
- Department of Medicine, University of California, San Diego, CA, USA
| | | | - Steven A Vitorino
- Department of Medicine, University of California, San Diego, CA, USA
| | - Peter D Wagner
- Department of Medicine, University of California, San Diego, CA, USA
| | - Marcus Fruttiger
- UCL Institute of Ophthalmology, University College London, London, UK
| | - Ellen C Breen
- Department of Medicine, University of California, San Diego, CA, USA
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Li Y, Shen J, Cheng CS, Gao H, Zhao J, Chen L. Overexpression of pyruvate dehydrogenase phosphatase 1 promotes the progression of pancreatic adenocarcinoma by regulating energy-related AMPK/mTOR signaling. Cell Biosci 2020; 10:95. [PMID: 32782783 PMCID: PMC7412669 DOI: 10.1186/s13578-020-00457-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 07/29/2020] [Indexed: 12/12/2022] Open
Abstract
Background Human pyruvate dehydrogenase phosphatase 1 (PDP1) plays an important physiological role in energy metabolism; however, its expression and function in human pancreatic adenocarcinoma (PDAC) remain unknown. This study aimed to investigate the expression pattern and mechanisms of action of PDP1 in human PDAC. Methods The expression pattern of PDP1 in PDAC was determined, and its correlation with patient survival was analyzed. Ectopic expression or knockdown of PDP1 was performed, and in vitro proliferation and migration, as well as in vivo tumor growth of PDAC, were measured. The mechanism was studied by biochemical approaches. Results PDP1 was overexpressed in human PDAC samples, and high expression of PDP1 correlated with poor overall and disease-free survival of PDAC patients. PDP1 promoted the proliferation, colony formation, and invasion of PDAC cells in vitro and facilitated orthotopic tumor growth in vivo. PDP1 accelerated intracellular ATP production, leading to sufficient energy to support rapid cancer progression. mTOR activation was responsible for the PDP1-induced tumor cell proliferation and invasion in PDAC. AMPK was downregulated by PDP1 overexpression, resulting in mTOR activation and cancer progression. Conclusion Our findings suggested that PDP1 could be a promising diagnostic and therapeutic target for anti-PDAC treatment.
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Affiliation(s)
- Ye Li
- Department of Integrated Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032 China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032 China
| | - Jia Shen
- Department of Oncology, First People's Hospital of Pinghu, Zhejiang, 314200 China
| | - Chien-Shan Cheng
- Department of Integrated Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032 China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032 China
| | - HuiFeng Gao
- Department of Integrated Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032 China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032 China
| | - Jiangang Zhao
- Department of Oncology, Shaoxing Central Hospital, Zhejiang, 312030 China
| | - Lianyu Chen
- Department of Integrated Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032 China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032 China
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MiR-195 modulates oxidative stress-induced apoptosis and mitochondrial energy production in human trophoblasts via flavin adenine dinucleotide-dependent oxidoreductase domain-containing protein 1 and pyruvate dehydrogenase phosphatase regulatory subunit. J Hypertens 2019; 36:306-318. [PMID: 28858979 DOI: 10.1097/hjh.0000000000001529] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Preeclampsia is a severe pregnancy-specific syndrome defined as newly onset hypertension and proteinuria. Abnormal placental development has been generally accepted as the initial cause of the disorder. Recently, miR-195 was identified as one of the downregulated small RNAs in preeclamptic placentas. METHODS The potential targets of miR-195 in human trophoblast cells were screened by isobaric tags for relative and absolute quantification-based mass spectrum analysis. Localization of miR-195 and its targets was examined by in-situ hybridization and immunohistochemistry in human placenta. Real-time PCR, western blotting and luciferase assay were used for target validation. Apoptosis was accessed by Annexin V/PI costaining, whereas mitochondrial function by ATP measurement and tetramethylrhodamine ethyl ester fluorescence. RESULTS Two mitochondria-associated proteins, flavin adenine dinucleotide-dependent oxidoreductase domain-containing protein 1 (FOXRED1) and pyruvate dehydrogenase phosphatase regulatory subunit (PDPR), were identified as targets of miR-195. Overexpression of miR-195 in HTR8/SVneo cells resulted in enhanced apoptosis, decreased mitochondrial membrane potential and cellular ATP content upon hydrogen peroxide stimulation. The effects could be partially rescued by FOXRED1 or PDPR. In preeclamptic patients, lowered circulating level of miR-195 were found at early-to-mid gestation and term pregnancy, and marked increase in FOXRED1 and PDPR expression were observed in the placenta when compared with gestational week-matched controls. In addition, chronic hydrogen peroxide stimuli suppressed miR-195 expression in trophoblast cells. CONCLUSION MiR-195 could suppress mitochondrial energy production via targeting FOXRED1 and PDPR, and lead to trophoblast cell apoptosis under oxidative stress. In preeclamptic placenta, lowered level of miR-195 might be induced by chorionic oxidative stress and subsequently form a compensation mechanism to defend the disturbed energy production and cell apoptosis upon oxidative stress.
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Lander N, Chiurillo MA, Bertolini MS, Storey M, Vercesi AE, Docampo R. Calcium-sensitive pyruvate dehydrogenase phosphatase is required for energy metabolism, growth, differentiation, and infectivity of Trypanosoma cruzi. J Biol Chem 2018; 293:17402-17417. [PMID: 30232153 DOI: 10.1074/jbc.ra118.004498] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 09/13/2018] [Indexed: 01/23/2023] Open
Abstract
In vertebrate cells, mitochondrial Ca2+ uptake by the mitochondrial calcium uniporter (MCU) leads to Ca2+-mediated stimulation of an intramitochondrial pyruvate dehydrogenase phosphatase (PDP). This enzyme dephosphorylates serine residues in the E1α subunit of pyruvate dehydrogenase (PDH), thereby activating PDH and resulting in increased ATP production. Although a phosphorylation/dephosphorylation cycle for the E1α subunit of PDH from nonvertebrate organisms has been described, the Ca2+-mediated PDP activation has not been studied. In this work, we investigated the Ca2+ sensitivity of two recombinant PDPs from the protozoan human parasites Trypanosoma cruzi (TcPDP) and T. brucei (TbPDP) and generated a TcPDP-KO cell line to establish TcPDP's role in cell bioenergetics and survival. Moreover, the mitochondrial localization of the TcPDP was studied by CRISPR/Cas9-mediated endogenous tagging. Our results indicate that TcPDP and TbPDP both are Ca2+-sensitive phosphatases. Of note, TcPDP-KO epimastigotes exhibited increased levels of phosphorylated TcPDH, slower growth and lower oxygen consumption rates than control cells, an increased AMP/ATP ratio and autophagy under starvation conditions, and reduced differentiation into infective metacyclic forms. Furthermore, TcPDP-KO trypomastigotes were impaired in infecting cultured host cells. We conclude that TcPDP is a Ca2+-stimulated mitochondrial phosphatase that dephosphorylates TcPDH and is required for normal growth, differentiation, infectivity, and energy metabolism in T. cruzi Our results support the view that one of the main roles of the MCU is linked to the regulation of intramitochondrial dehydrogenases.
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Affiliation(s)
- Noelia Lander
- From the Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, 13083, Brazil and
| | - Miguel A Chiurillo
- From the Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, 13083, Brazil and
| | - Mayara S Bertolini
- From the Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, 13083, Brazil and
| | - Melissa Storey
- Center for Tropical and Emerging Global Diseases and Department of Cellular Biology, University of Georgia, Athens, Georgia, 30602
| | - Anibal E Vercesi
- From the Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, 13083, Brazil and
| | - Roberto Docampo
- From the Departamento de Patologia Clínica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, São Paulo, 13083, Brazil and .,Center for Tropical and Emerging Global Diseases and Department of Cellular Biology, University of Georgia, Athens, Georgia, 30602
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Swimming exercise prevents behavioural disturbances induced by an intracerebroventricular injection of amyloid-β 1-42 peptide through modulation of cytokine/NF-kappaB pathway and indoleamine-2,3-dioxygenase in mouse brain. Behav Brain Res 2017; 331:1-13. [DOI: 10.1016/j.bbr.2017.05.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 05/06/2017] [Accepted: 05/10/2017] [Indexed: 12/15/2022]
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Mitochondrial pyruvate dehydrogenase phosphatase 1 regulates the early differentiation of cardiomyocytes from mouse embryonic stem cells. Exp Mol Med 2016; 48:e254. [PMID: 27538372 PMCID: PMC5007642 DOI: 10.1038/emm.2016.70] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/02/2016] [Accepted: 03/22/2016] [Indexed: 02/06/2023] Open
Abstract
Mitochondria are crucial for maintaining the properties of embryonic stem cells (ESCs) and for regulating their subsequent differentiation into diverse cell lineages, including cardiomyocytes. However, mitochondrial regulators that manage the rate of differentiation or cell fate have been rarely identified. This study aimed to determine the potential mitochondrial factor that controls the differentiation of ESCs into cardiac myocytes. We induced cardiomyocyte differentiation from mouse ESCs (mESCs) and performed microarray assays to assess messenger RNA (mRNA) expression changes at differentiation day 8 (D8) compared with undifferentiated mESCs (D0). Among the differentially expressed genes, Pdp1 expression was significantly decreased (27-fold) on D8 compared to D0, which was accompanied by suppressed mitochondrial indices, including ATP levels, membrane potential, ROS and mitochondrial Ca2+. Notably, Pdp1 overexpression significantly enhanced the mitochondrial indices and pyruvate dehydrogenase activity and reduced the expression of cardiac differentiation marker mRNA and the cardiac differentiation rate compared to a mock control. In confirmation of this, a knockdown of the Pdp1 gene promoted the expression of cardiac differentiation marker mRNA and the cardiac differentiation rate. In conclusion, our results suggest that mitochondrial PDP1 is a potential regulator that controls cardiac differentiation at an early differentiation stage in ESCs.
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Consitt LA, Saxena G, Saneda A, Houmard JA. Age-related impairments in skeletal muscle PDH phosphorylation and plasma lactate are indicative of metabolic inflexibility and the effects of exercise training. Am J Physiol Endocrinol Metab 2016; 311:E145-56. [PMID: 27221120 PMCID: PMC4967149 DOI: 10.1152/ajpendo.00452.2015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 05/19/2016] [Indexed: 01/12/2023]
Abstract
The purpose of this study was to determine whether plasma lactate and skeletal muscle glucose regulatory pathways, specifically PDH dephosphorylation, are impaired during hyperinsulinemic conditions in middle- to older-aged individuals and determine whether exercise training could improve key variables responsible for skeletal muscle PDH regulation. Eighteen young (19-29 yr; n = 9 males and 9 females) and 20 middle- to older-aged (57-82 yr; n = 10 males and 10 females) individuals underwent a 2-h euglycemic hyperinsulinemic clamp. Plasma samples were obtained at baseline and at 30, 50, 90, and 120 min for analysis of lactate, and skeletal muscle biopsies were performed at 60 min for analysis of protein associated with glucose metabolism. In response to insulin, plasma lactate was elevated in aged individuals when normalized to insulin action. Insulin-stimulated phosphorylation of skeletal muscle PDH on serine sites 232, 293, and 300 decreased in young individuals only. Changes in insulin-stimulated PDH phosphorylation were positively related to changes in plasma lactate. No age-related differences were observed in skeletal muscle phosphorylation of LDH, GSK-3α, or GSK-3β in response to insulin or PDP1, PDP2, PDK2, PDK4, or MPC1 total protein. Twelve weeks of endurance- or strength-oriented exercise training improved insulin-stimulated PDH dephosphorylation, which was related to a reduced lactate response. These findings suggest that impairments in insulin-induced PDH regulation in a sedentary aging population contribute to impaired glucose metabolism and that exercise training is an effective intervention for treating metabolic inflexibility.
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Affiliation(s)
- Leslie A Consitt
- Department of Biomedical Sciences, Ohio University, Athens, Ohio; Ohio Musculoskeletal and Neurological Institute, Ohio University, Athens, Ohio; Diabetes Institute, Ohio University, Athens, Ohio;
| | - Gunjan Saxena
- Department of Biomedical Sciences, Ohio University, Athens, Ohio
| | - Alicson Saneda
- Department of Biological Sciences, Ohio University, Athens, Ohio
| | - Joseph A Houmard
- Department of Kinesiology, Human Performance Laboratory, East Carolina University, Greenville, North Carolina; and East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
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Gómez-Gómez E, Ríos-Martínez ME, Castro-Rodríguez EM, Del-Toro-Equíhua M, Ramírez-Flores M, Delgado-Enciso I, Pérez-Huitimea AL, Baltazar-Rodríguez LM, Velasco-Pineda G, Muñiz-Murguía J. Carnitine palmitoyltransferase 1B 531K allele carriers sustain a higher respiratory quotient after aerobic exercise, but β3-adrenoceptor 64R allele does not affect lipolysis: a human model. PLoS One 2014; 9:e96791. [PMID: 24905907 PMCID: PMC4048163 DOI: 10.1371/journal.pone.0096791] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 04/11/2014] [Indexed: 11/28/2022] Open
Abstract
Carnitine palmitoyltransferase IB (CPT1B) and adrenoceptor beta-3 (ADRB3) are critical regulators of fat metabolism. CPT1B transports free acyl groups into mitochondria for oxidation, and ADRB3 triggers lipolysis in adipocytes, and their respective polymorphisms E531K and W64R have been identified as indicators of obesity in population studies. It is therefore important to understand the effects of these mutations on ADRB3 and CPT1B function in adipose and skeletal muscle tissue, respectively. This study aimed to analyze the rate of lipolysis of plasma indicators (glycerol, free fatty acids, and beta hydroxybutyrate) and fat oxidation (through the non-protein respiratory quotient). These parameters were measured in 37 participants during 30 min of aerobic exercise at approximately 62% of maximal oxygen uptake, followed by 30 min of recovery. During recovery, mean respiratory quotient values were higher in K allele carriers than in non-carriers, indicating low post-exercise fatty acid oxidation rates. No significant differences in lipolysis or lipid oxidation were observed between R and W allele carriers of ADRB3 at any time during the aerobic load. The substitution of glutamic acid at position 531 by lysine in the CPT1B protein decreases the mitochondrial beta-oxidation pathway, which increases the non-protein respiratory quotient value during recovery from exercise. This may contribute to weight gain or reduced weight-loss following exercise.
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Affiliation(s)
- Eduardo Gómez-Gómez
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Colima, Colima, México
| | | | | | | | - Mario Ramírez-Flores
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Colima, Colima, México
| | | | - Ana Lilia Pérez-Huitimea
- Educación Física y Deporte. Facultad de Ciencias de la Educación, Universidad de Colima, Colima, Colima, México
| | | | | | - Jesús Muñiz-Murguía
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Colima, Colima, México
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Souza LC, Filho CB, Goes ATR, Fabbro LD, de Gomes MG, Savegnago L, Oliveira MS, Jesse CR. Neuroprotective Effect of Physical Exercise in a Mouse Model of Alzheimer’s Disease Induced by β-Amyloid1–40 Peptide. Neurotox Res 2013; 24:148-63. [DOI: 10.1007/s12640-012-9373-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2012] [Revised: 12/04/2012] [Accepted: 12/28/2012] [Indexed: 12/18/2022]
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