1
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Kim KQ, Nanjaraj Urs AN, Lasehinde V, Greenlaw AC, Hudson BH, Zaher HS. eIF4F complex dynamics are important for the activation of the integrated stress response. Mol Cell 2024; 84:2135-2151.e7. [PMID: 38848692 PMCID: PMC11189614 DOI: 10.1016/j.molcel.2024.04.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/08/2023] [Accepted: 04/19/2024] [Indexed: 06/09/2024]
Abstract
In response to stress, eukaryotes activate the integrated stress response (ISR) via phosphorylation of eIF2α to promote the translation of pro-survival effector genes, such as GCN4 in yeast. Complementing the ISR is the target of rapamycin (TOR) pathway, which regulates eIF4E function. Here, we probe translational control in the absence of eIF4E in Saccharomyces cerevisiae. Intriguingly, we find that loss of eIF4E leads to de-repression of GCN4 translation. In addition, we find that de-repression of GCN4 translation is accompanied by neither eIF2α phosphorylation nor reduction in initiator ternary complex (TC). Our data suggest that when eIF4E levels are depleted, GCN4 translation is de-repressed via a unique mechanism that may involve faster scanning by the small ribosome subunit due to increased local concentration of eIF4A. Overall, our findings suggest that relative levels of eIF4F components are key to ribosome dynamics and may play important roles in translational control of gene expression.
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Affiliation(s)
- Kyusik Q Kim
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA
| | | | - Victor Lasehinde
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Alison C Greenlaw
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Benjamin H Hudson
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA
| | - Hani S Zaher
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA.
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2
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Guo J, Dai W, Wu W, Zhuang S, Zhang H, Cen L. Microfluidic nanoprecipitation of PEGylated PLGA nanoparticles with rapamycin and performance evaluation. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2024; 35:1197-1213. [PMID: 38421916 DOI: 10.1080/09205063.2024.2321634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 02/06/2024] [Indexed: 03/02/2024]
Abstract
Rapamycin (RAP) is currently being developed as potential antibreast cancer drug. However, its poor solubility completely limits its use. The aim of this study was to develop polyethylene glycol-poly(lactide-co-glycolide) (PEG-PLGA)-based nanoparticles (NPs) to load RAP via microfluidics with an appropriate polyethylene glycol (PEG) content to enhance the bioavailability of RAP. Polydimethylsiloxane (PDMS) chips with a Y-shaped channel were designed to obtain RAP-loaded PEG-PLGA NPs (RAP-PEG-PLGA). The entrapment efficiency (EE) and drug loading (DL) as well as release profile of RAP-PEG-PLGA were evaluated, and their resistance to plasma albumin adsorption of NPs with different PEG contents was evaluated and compared. RAW264.7 and 4T1 cells were used to assess the antiphagocytic and anticancer cells effect of NPs, respectively. RAP-PEG-PLGA of around 124 nm in size were successfully prepared with the EE of 82.0% and DL of 12.3%, and sustained release for around 40 d. A PEG relative content of 10% within the PEG-PLGA molecule was shown superior in resisting protein adsorption. RAP-PEG-PLGA inhibited the growth of breast cancer cells when the concentration was over 10 μg/mL, and the inhibition efficiency was significantly higher than free RAP. Hence, the current RAP-PEG-PLGA could be a potential therapeutic system for breast cancer treatment.
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Affiliation(s)
- Jiahao Guo
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Wenjing Dai
- State Key Laboratory of Bioreactor Engineering, School of Bioengineering, East China University of Science and Technology, Shanghai, China
| | - Weiqian Wu
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Shiya Zhuang
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Huan Zhang
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Lian Cen
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
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3
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Mo L, Deng M, Chen J, Huai S, Du L, Xu X, Guo Q, Chen H, Li X, Bao Z. Subconjunctival injection of rapamycin-loaded polymeric microparticles for effective suppression of noninfectious uveitis in rats. Int J Pharm 2024; 657:124178. [PMID: 38692499 DOI: 10.1016/j.ijpharm.2024.124178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 04/01/2024] [Accepted: 04/28/2024] [Indexed: 05/03/2024]
Abstract
Noninfective uveitis is a major cause of vision impairment, and corticosteroid medication is a mainstay clinical strategy that causes severe side effects. Rapamycin (RAPA), a potent immunomodulator, is a promising treatment for noninfective uveitis. However, because high and frequent dosages are required, it is a great challenge to implement its clinical translation for noninfective uveitis therapy owing to its serious toxicity. In the present study, we engineered an injectable microparticulate drug delivery system based on biodegradable block polymers (i.e., polycaprolactone-poly (ethylene glycol)-polycaprolactone, PCEC) for efficient ocular delivery of RAPA via a subconjunctival injection route and investigated its therapeutic efficacy in an experimental autoimmune uveitis (EAU) rat model. RAPA-PCEC microparticles were fabricated using the emulsion-evaporation method and thoroughly characterized using scanning electron microscopy, fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry. The formed microparticles exhibited slow in vitro degradation over 28 days, and provided both in vitro and in vivo sustained release of RAPA over 4 weeks. Additionally, a single subconjunctival injection of PCEC microparticles resulted in high ocular tolerance. More importantly, subconjunctival injection of RAPA-PCEC microparticles significantly attenuated the clinical signs of EAU in a dose-dependent manner by reducing inflammatory cell infiltration (i.e., CD45+ cells and Th17 cells) and inhibiting microglial activation. Overall, this injectable microparticulate system may be promising vehicle for intraocular delivery of RAPA for the treatment of noninfective uveitis.
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Affiliation(s)
- Lihua Mo
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Mengyun Deng
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Jinrun Chen
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Shuo Huai
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Lulu Du
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Xiaoning Xu
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Qi Guo
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Hao Chen
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
| | - Xingyi Li
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
| | - Zhishu Bao
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
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4
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Howard GC, Wang J, Rose KL, Jones C, Patel P, Tsui T, Florian AC, Vlach L, Lorey SL, Grieb BC, Smith BN, Slota MJ, Reynolds EM, Goswami S, Savona MR, Mason FM, Lee T, Fesik S, Liu Q, Tansey WP. Ribosome subunit attrition and activation of the p53-MDM4 axis dominate the response of MLL-rearranged cancer cells to WDR5 WIN site inhibition. eLife 2024; 12:RP90683. [PMID: 38682900 PMCID: PMC11057873 DOI: 10.7554/elife.90683] [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] [Indexed: 05/01/2024] Open
Abstract
The chromatin-associated protein WD Repeat Domain 5 (WDR5) is a promising target for cancer drug discovery, with most efforts blocking an arginine-binding cavity on the protein called the 'WIN' site that tethers WDR5 to chromatin. WIN site inhibitors (WINi) are active against multiple cancer cell types in vitro, the most notable of which are those derived from MLL-rearranged (MLLr) leukemias. Peptidomimetic WINi were originally proposed to inhibit MLLr cells via dysregulation of genes connected to hematopoietic stem cell expansion. Our discovery and interrogation of small-molecule WINi, however, revealed that they act in MLLr cell lines to suppress ribosome protein gene (RPG) transcription, induce nucleolar stress, and activate p53. Because there is no precedent for an anticancer strategy that specifically targets RPG expression, we took an integrated multi-omics approach to further interrogate the mechanism of action of WINi in human MLLr cancer cells. We show that WINi induce depletion of the stock of ribosomes, accompanied by a broad yet modest translational choke and changes in alternative mRNA splicing that inactivate the p53 antagonist MDM4. We also show that WINi are synergistic with agents including venetoclax and BET-bromodomain inhibitors. Together, these studies reinforce the concept that WINi are a novel type of ribosome-directed anticancer therapy and provide a resource to support their clinical implementation in MLLr leukemias and other malignancies.
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Affiliation(s)
- Gregory Caleb Howard
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Jing Wang
- Department of Biostatistics, Vanderbilt University Medical CenterNashvilleUnited States
- Center for Quantitative Sciences, Vanderbilt University Medical CenterNashvilleUnited States
| | - Kristie L Rose
- Mass Spectrometry Research Center, Vanderbilt University School of MedicineNashvilleUnited States
- Department of Biochemistry, Vanderbilt University School of MedicineNashvilleUnited States
| | - Camden Jones
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Purvi Patel
- Mass Spectrometry Research Center, Vanderbilt University School of MedicineNashvilleUnited States
| | - Tina Tsui
- Mass Spectrometry Research Center, Vanderbilt University School of MedicineNashvilleUnited States
| | - Andrea C Florian
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Logan Vlach
- Department of Medicine, Vanderbilt University Medical CenterNashvilleUnited States
| | - Shelly L Lorey
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Brian C Grieb
- Department of Medicine, Vanderbilt University Medical CenterNashvilleUnited States
| | - Brianna N Smith
- Department of Medicine, Vanderbilt University Medical CenterNashvilleUnited States
| | - Macey J Slota
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Elizabeth M Reynolds
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Soumita Goswami
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
| | - Michael R Savona
- Department of Medicine, Vanderbilt University Medical CenterNashvilleUnited States
| | - Frank M Mason
- Department of Medicine, Vanderbilt University Medical CenterNashvilleUnited States
| | - Taekyu Lee
- Department of Biochemistry, Vanderbilt University School of MedicineNashvilleUnited States
| | - Stephen Fesik
- Department of Biochemistry, Vanderbilt University School of MedicineNashvilleUnited States
- Department of Pharmacology, Vanderbilt University School of MedicineNashvilleUnited States
- Department of Chemistry, Vanderbilt UniversityNashvilleUnited States
| | - Qi Liu
- Department of Biostatistics, Vanderbilt University Medical CenterNashvilleUnited States
- Center for Quantitative Sciences, Vanderbilt University Medical CenterNashvilleUnited States
| | - William P Tansey
- Department of Cell and Developmental Biology, Vanderbilt University School of MedicineNashvilleUnited States
- Department of Biochemistry, Vanderbilt University School of MedicineNashvilleUnited States
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5
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Dong Y, Sun X, He W, Xiang J, Qi X, Hong W, He Y, Guan Z. Elevated Level of PINK1/Parkin-Mediated Mitophagy Pathway Involved to the Inhibited Activity of Mitochondrial Superoxide Dismutase in Rat Brains and Primary Hippocampal Neurons Exposed to High Level of Fluoride. Biol Trace Elem Res 2024; 202:538-547. [PMID: 37193858 DOI: 10.1007/s12011-023-03681-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 04/22/2023] [Indexed: 05/18/2023]
Abstract
To reveal the molecular mechanism of brain damage induced by chronic fluorosis, expression of PTEN-induced kinase 1 (PINK1)/parkin RBR E3 ubiquitin-protein ligase (Parkin)-mediated mitophagy pathway and activity of mitochondrial superoxide dismutase (SOD) were investigated in rat brains and primary cultured neurons exposed to high level of fluoride. Sprague-Dawley (SD) rats were treated with fluoride (0, 5, 50, and 100 ppm) for 3 and 6 months. The primary neurons were exposed to 0.4 mM (7.6 ppm) fluoride and thereafter treated with 100 nM rapamycin (a stimulator of mitophagy) or 50 μM 3-methyladenine (3-MA, an inhibitor of mitophagy) for 24 h. The expressions of PINK1/Parkin at the protein level and the activity of SOD in mitochondria of rat brains and cultured neurons were determined by Western blotting and biochemical method, respectively. The results showed that the rats exposed to fluoride exhibited different degrees of dental fluorosis. In comparison to controls, the expressions of PINK1 and Parkin were significantly higher in the rat brains and primary neurons exposed to high fluoride. In addition, a declined activity of mitochondrial SOD was determined. Interestingly, rapamycin treatment enhanced but 3-MA inhibited the changes of PINK1/Parkin pathway and SOD activity, and the correlations between the inhibited SOD activity and the elevated PINK1/Parkin proteins were observed. The results suggest that the inhibition of mitochondrial SOD activity induced by fluorosis may stimulate the expressions of mitophagy (PINK1/ Parkin) pathway to maintain the mitochondrial homeostasis.
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Affiliation(s)
- Yangting Dong
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Xiufen Sun
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Wenwen He
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Jie Xiang
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Xiaolan Qi
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Wei Hong
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Yan He
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Zhizhong Guan
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China.
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China.
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6
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Howard GC, Wang J, Rose KL, Jones C, Patel P, Tsui T, Florian AC, Vlach L, Lorey SL, Grieb BC, Smith BN, Slota MJ, Reynolds EM, Goswami S, Savona MR, Mason FM, Lee T, Fesik SW, Liu Q, Tansey WP. Ribosome subunit attrition and activation of the p53-MDM4 axis dominate the response of MLL-rearranged cancer cells to WDR5 WIN site inhibition. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.07.26.550648. [PMID: 37546802 PMCID: PMC10402127 DOI: 10.1101/2023.07.26.550648] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
The chromatin-associated protein WD Repeat Domain 5 (WDR5) is a promising target for cancer drug discovery, with most efforts blocking an arginine-binding cavity on the protein called the "WIN" site that tethers WDR5 to chromatin. WIN site inhibitors (WINi) are active against multiple cancer cell types in vitro, the most notable of which are those derived from MLL-rearranged (MLLr) leukemias. Peptidomimetic WINi were originally proposed to inhibit MLLr cells via dysregulation of genes connected to hematopoietic stem cell expansion. Our discovery and interrogation of small molecule WIN site inhibitors, however, revealed that they act in MLLr cell lines to suppress ribosome protein gene (RPG) transcription, induce nucleolar stress, and activate p53. Because there is no precedent for an anti-cancer strategy that specifically targets RPG expression, we took an integrated multi-omics approach to further interrogate the mechanism of action of WINi in MLLr cancer cells. We show that WINi induce depletion of the stock of ribosomes, accompanied by a broad yet modest translational choke and changes in alternative mRNA splicing that inactivate the p53 antagonist MDM4. We also show that WINi are synergistic with agents including venetoclax and BET-bromodomain inhibitors. Together, these studies reinforce the concept that WINi are a novel type of ribosome-directed anti-cancer therapy and provide a resource to support their clinical implementation in MLLr leukemias and other malignancies.
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Affiliation(s)
- Gregory C. Howard
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Jing Wang
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Center for Quantitative Sciences, Vanderbilt University Medical Center, Nashville, TN, 37232, USA
| | - Kristie Lindsey Rose
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Camden Jones
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Purvi Patel
- Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Tina Tsui
- Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Andrea C. Florian
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Current address: Department of Biology, Belmont University, Nashville, TN 37212, USA
| | - Logan Vlach
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Shelly L. Lorey
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Brian C. Grieb
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Brianna N. Smith
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Macey J. Slota
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Current address: Department of Urology, University of California San Francisco, San Francisco CA 94143, USA
| | - Elizabeth M. Reynolds
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Soumita Goswami
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Michael R. Savona
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Frank M. Mason
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Taekyu Lee
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Stephen W. Fesik
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Chemistry, Vanderbilt University, Nashville, TN 37232, USA
| | - Qi Liu
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Center for Quantitative Sciences, Vanderbilt University Medical Center, Nashville, TN, 37232, USA
| | - William P. Tansey
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
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7
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Fakhar AZ, Liu J, Pajerowska-Mukhtar KM, Mukhtar MS. The ORFans' tale: new insights in plant biology. TRENDS IN PLANT SCIENCE 2023; 28:1379-1390. [PMID: 37453923 DOI: 10.1016/j.tplants.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 05/17/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023]
Abstract
Orphan genes (OGs) are protein-coding genes without a significant sequence similarity in closely related species. Despite their functional importance, very little is known about the underlying molecular mechanisms by which OGs participate in diverse biological processes. Here, we discuss the evolutionary mechanisms of OGs' emergence with relevance to species-specific adaptations. We also provide a mechanistic view of the involvement of OGs in multiple processes, including growth, development, reproduction, and carbon-metabolism-mediated immunity. We highlight the interconnection between OGs and the sucrose nonfermenting 1 (SNF1)-related protein kinases (SnRKs)-target of rapamycin (TOR) signaling axis for phytohormone signaling, nutrient metabolism, and stress responses. Finally, we propose a high-throughput pipeline for OGs' interspecies and intraspecies gene transfer through a transgenic approach for future biotechnological advances.
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Affiliation(s)
- Ali Zeeshan Fakhar
- Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35294, USA
| | - Jinbao Liu
- Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35294, USA
| | | | - M Shahid Mukhtar
- Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35294, USA.
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8
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Roth JR, de Moraes RCM, Xu BP, Crawley SR, Khan MA, Melkani GC. Rapamycin reduces neuronal mutant huntingtin aggregation and ameliorates locomotor performance in Drosophila. Front Aging Neurosci 2023; 15:1223911. [PMID: 37823007 PMCID: PMC10562706 DOI: 10.3389/fnagi.2023.1223911] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 09/05/2023] [Indexed: 10/13/2023] Open
Abstract
Huntington's disease (HD) is a neurodegenerative disease characterized by movement and cognitive dysfunction. HD is caused by a CAG expansion in exon 1 of the HTT gene that leads to a polyglutamine (PQ) repeat in the huntingtin protein, which aggregates in the brain and periphery. Previously, we used Drosophila models to determine that Htt-PQ aggregation in the heart causes shortened lifespan and cardiac dysfunction that is ameliorated by promoting chaperonin function or reducing oxidative stress. Here, we further study the role of neuronal mutant huntingtin and how it affects peripheral function. We overexpressed normal (Htt-PQ25) or expanded mutant (Htt-PQ72) exon 1 of huntingtin in Drosophila neurons and found that mutant huntingtin caused age-dependent Htt-PQ aggregation in the brain and could cause a loss of synapsin. To determine if this neuronal dysfunction led to peripheral dysfunction, we performed a negative geotaxis assay to measure locomotor performance and found that neuronal mutant huntingtin caused an age-dependent decrease in locomotor performance. Next, we found that rapamycin reduced Htt-PQ aggregation in the brain. These results demonstrate the role of neuronal Htt-PQ in dysfunction in models of HD, suggest that brain-periphery crosstalk could be important to the pathogenesis of HD, and show that rapamycin reduces mutant huntingtin aggregation in the brain.
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Affiliation(s)
- Jonathan R. Roth
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
- Department of Neurobiology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Ruan Carlos Macedo de Moraes
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Brittney P. Xu
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Savannah R. Crawley
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Malghalara A. Khan
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Girish C. Melkani
- Department of Pathology, Cellular and Molecular Division, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
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9
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Guadagnin AR, Fehlberg LK, Thomas B, Sugimoto Y, Shinzato I, Cardoso FC. Feeding rumen-protected lysine prepartum alters placental metabolism at a transcriptional level. J Dairy Sci 2023; 106:6567-6576. [PMID: 37532623 DOI: 10.3168/jds.2022-22390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 02/24/2023] [Indexed: 08/04/2023]
Abstract
Rumen-protected Lys (RPL) fed to Holstein cows prepartum resulted in a greater intake and improved health of their calves during the first 6 wk of life. However, whether increased supply of Lys in late gestation can influence placental tissue and, if so, which pathways are affected remain to be investigated. Therefore, we hypothesize that feeding RPL during late gestation could modulate placental metabolism, allowing for improved passage of nutrients to the fetus and thus influencing the offspring development. Therefore, we aimed to determine the effects of feeding RPL (AjiPro-L Generation 3, Ajinomoto Health and Nutrition North America) prepartum (0.54% DM of TMR) on mRNA gene expression profiles of placental samples of Holstein cows. Seventy multiparous Holstein cows were randomly assigned to 1 of 2 dietary treatments, consisting of TMR top-dressed with RPL (PRE-L) or without (control, CON), fed from 27 ± 5 d prepartum until calving. After natural delivery (6.87 ± 3.32 h), placentas were rinsed with physiological saline (0.9% sodium chloride solution) to clean any dirtiness from the environment and weighed. Then, 3 placentomes were collected, one from each placental region (cranial, central, and caudal), combined and flash-frozen in liquid nitrogen to evaluate the expression of transcripts and proteins related to protein metabolism and inflammation. Placental weights did not differ from cows in PRE-L (15.5 ± 4.03 kg) and cows in CON (14.5 ± 4.03 kg). Feeding RPL prepartum downregulated the expression of NOS3 (nitric oxide synthase 3), involved in vasodilation processes, and SOD1, which encodes the enzyme superoxide dismutase, involved in oxidative stress processes. Additionally, feeding RPL prepartum upregulated the expression of transcripts involved in energy metabolism (SLC2A3, glucose transporter 3; and PCK1, phosphoenolpyruvate carboxykinase 1), placental metabolism and cell proliferation (FGF2, fibroblast growth factor 2; FGF2R, fibroblast growth factor 2 receptor; and PGF, placental growth factor), Met metabolism (MAT2A, methionine adenosyltransferase 2-α), and tended to upregulate IGF2R (insulin-like growth factor 2 receptor). Placental FGF2 and LRP1 (low-density lipoprotein receptor-related protein 1) protein abundance were greater for cows that received RPL prepartum than cows in CON. In conclusion, feeding RPL to prepartum dairy cows altered uteroplacental expression of genes and proteins involved in cell proliferation, and in metabolism and transport of glucose. Such changes are illustrated by increased expression of SLC2A3 and PCK1 and increased protein abundance of FGF2 and LRP1 in uteroplacental tissue of cows consuming RPL.
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Affiliation(s)
- A R Guadagnin
- Department of Animal Sciences, University of Illinois Urbana-Champaign, IL 61801
| | - L K Fehlberg
- Department of Animal Sciences, University of Illinois Urbana-Champaign, IL 61801
| | - B Thomas
- Department of Animal Sciences, University of Illinois Urbana-Champaign, IL 61801
| | | | | | - F C Cardoso
- Department of Animal Sciences, University of Illinois Urbana-Champaign, IL 61801.
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10
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Mohanty A, Alhaj Sulaiman A, Moovarkumudalvan B, Ali R, Aouida M, Ramotar D. The Yeast Permease Agp2 Senses Cycloheximide and Undergoes Degradation That Requires the Small Protein Brp1-Cellular Fate of Agp2 in Response to Cycloheximide. Int J Mol Sci 2023; 24:ijms24086975. [PMID: 37108141 PMCID: PMC10138708 DOI: 10.3390/ijms24086975] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 03/25/2023] [Accepted: 04/02/2023] [Indexed: 04/29/2023] Open
Abstract
The Saccharomyces cerevisiae Agp2 is a plasma membrane protein initially reported to be an uptake transporter for L-carnitine. Agp2 was later rediscovered, together with three additional proteins, Sky1, Ptk2, and Brp1, to be involved in the uptake of the polyamine analogue bleomycin-A5, an anticancer drug. Mutants lacking either Agp2, Sky1, Ptk2, or Brp1 are extremely resistant to polyamines and bleomycin-A5, suggesting that these four proteins act in the same transport pathway. We previously demonstrated that pretreating cells with the protein synthesis inhibitor cycloheximide (CHX) blocked the uptake of fluorescently labelled bleomycin (F-BLM), raising the possibility that CHX could either compete for F-BLM uptake or alter the transport function of Agp2. Herein, we showed that the agp2Δ mutant displayed striking resistance to CHX as compared to the parent, suggesting that Agp2 is required to mediate the physiological effect of CHX. We examined the fate of Agp2 as a GFP tag protein in response to CHX and observed that the drug triggered the disappearance of Agp2 in a concentration- and time-dependent manner. Immunoprecipitation analysis revealed that Agp2-GFP exists in higher molecular weight forms that were ubiquitinylated, which rapidly disappeared within 10 min of treatment with CHX. CHX did not trigger any significant loss of Agp2-GFP in the absence of the Brp1 protein; however, the role of Brp1 in this process remains elusive. We propose that Agp2 is degraded upon sensing CHX to downregulate further uptake of the drug and discuss the potential function of Brp1 in the degradation process.
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Affiliation(s)
- Ashima Mohanty
- Division of Genomics and Precision Medicine, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
| | - Abdallah Alhaj Sulaiman
- Division of Biological and Biomedical Sciences, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
| | - Balasubramanian Moovarkumudalvan
- Division of Genomics and Precision Medicine, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
- Division of Biological and Biomedical Sciences, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
| | - Reem Ali
- Division of Biological and Biomedical Sciences, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
| | - Mustapha Aouida
- Division of Biological and Biomedical Sciences, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
| | - Dindial Ramotar
- Division of Biological and Biomedical Sciences, College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Qatar Foundation, Doha P.O. Box 34110, Qatar
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11
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Zhang N, Feng S, Tian Y, Zhuang L, Cha G, Duan S, Li H, Nong X, Zhang Z, Tu X, Wang G. Identification, characterization and spatiotemporal expression analysis of the FKBP family genes in Locusta migratoria. Sci Rep 2023; 13:4048. [PMID: 36899085 PMCID: PMC10006077 DOI: 10.1038/s41598-023-30889-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 03/02/2023] [Indexed: 03/12/2023] Open
Abstract
FK506 binding proteins (FKBPs) are a highly-conserved group of proteins known to bind to FK506, an immunosuppressive drug. They play different physiological roles, including transcription regulation, protein folding, signal transduction and immunosuppression. A number of FKBP genes have been identified in eukaryotes; however, very little information about these genes has been reported in Locusta migratoria. Here, we identified and characterized 10 FKBP genes from L. migratoria. Phylogenetic analysis and comparison of domain architectures indicated that the LmFKBP family can be divided into two subfamilies and five subclasses. Developmental and tissue expression pattern analysis revealed that all LmFKBPs transcripts, including LmFKBP46, LmFKBP12, LmFKBP47, LmFKBP79, LmFKBP16, LmFKBP24, LmFKBP44b, LmFKBP53, were periodically expressed during different developmental stages and mainly expressed in the fat body, hemolymph, testis, and ovary. In brief, our work depicts a outline but panoramic picture of LmFKBP family in L. migratoria, and provides a solid foundation to further investigate the molecular functions of LmFKBPs.
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Affiliation(s)
- Neng Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.,Scientific Observation and Experimental Station of Pests in Xilingol Rangeland, Ministry of Agriculture and Rural Affairs, Xilinhot, 026000, China
| | - Shiqian Feng
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Ye Tian
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Ling Zhuang
- Bayannur Forestry and Grassland Development Center, Bayannur, 015000, China
| | - Gan Cha
- Bayannur Forestry and Grassland Development Center, Bayannur, 015000, China
| | - Saiya Duan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Hongmei Li
- MARA-CABI Joint Laboratory for Bio-Safety, Institute of Plant Protection, Chinese Academy of Agricultural Science, Beijing, 100193, China
| | - Xiangqun Nong
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Zehua Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Xiongbing Tu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.,Scientific Observation and Experimental Station of Pests in Xilingol Rangeland, Ministry of Agriculture and Rural Affairs, Xilinhot, 026000, China
| | - Guangjun Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China. .,Scientific Observation and Experimental Station of Pests in Xilingol Rangeland, Ministry of Agriculture and Rural Affairs, Xilinhot, 026000, China.
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12
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Orthologs of Human-Disease-Associated Genes in Plants Are Involved in Regulating Leaf Senescence. Life (Basel) 2023; 13:life13020559. [PMID: 36836919 PMCID: PMC9965218 DOI: 10.3390/life13020559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 02/10/2023] [Accepted: 02/14/2023] [Indexed: 02/19/2023] Open
Abstract
As eukaryotes, plants and animals have many commonalities on the genetic level, although they differ greatly in appearance and physiological habits. The primary goal of current plant research is to improve the crop yield and quality. However, plant research has a wider aim, exploiting the evolutionary conservatism similarities between plants and animals, and applying discoveries in the field of botany to promote zoological research that will ultimately serve human health, although very few studies have addressed this aspect. Here, we analyzed 35 human-disease-related gene orthologs in plants and characterized the genes in depth. Thirty-four homologous genes were found to be present in the herbaceous annual plant Arabidopsis thaliana and the woody perennial plant Populus trichocarpa, with most of the genes having more than two exons, including the ATM gene with 78 exons. More surprisingly, 27 (79.4%) of the 34 homologous genes in Arabidopsis were found to be senescence-associated genes (SAGs), further suggesting a close relationship between human diseases and cellular senescence. Protein-protein interaction network analysis revealed that the 34 genes formed two main subnetworks, and genes in the first subnetwork interacted with 15 SAGs. In conclusion, our results show that most of the 34 homologs of human-disease-associated genes in plants are involved in the leaf senescence process, suggesting that leaf senescence may offer a means to study the pathogenesis of human diseases and to screen drugs for the treat of diseases.
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13
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Shi X, von Weltin E, Fitzsimmons E, Do C, Caban Rivera C, Chen C, Liu-Chen LY, Unterwald EM. Reactivation of cocaine contextual memory engages mechanistic target of rapamycin/S6 kinase 1 signaling. Front Pharmacol 2022; 13:976932. [PMID: 36238569 PMCID: PMC9552424 DOI: 10.3389/fphar.2022.976932] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/25/2022] [Indexed: 11/25/2022] Open
Abstract
Mechanistic target of rapamycin (mTOR) C1 and its downstream effectors have been implicated in synaptic plasticity and memory. Our prior work demonstrated that reactivation of cocaine memory engages a signaling pathway consisting of Akt, glycogen synthase kinase-3β (GSK3β), and mTORC1. The present study sought to identify other components of mTORC1 signaling involved in the reconsolidation of cocaine contextual memory, including eukaryotic translation initiation factor 4E (eIF4E)-eIF4G interactions, p70 S6 kinase polypeptide 1 (p70S6K, S6K1) activity, and activity-regulated cytoskeleton (Arc) expression. Cocaine contextual memory was established in adult CD-1 mice using conditioned place preference. After cocaine place preference was established, mice were briefly re-exposed to the cocaine-paired context to reactivate the cocaine memory and brains examined. Western blot analysis showed that phosphorylation of the mTORC1 target, p70S6K, in nucleus accumbens and hippocampus was enhanced 60 min following reactivation of cocaine memories. Inhibition of mTORC1 with systemic administration of rapamycin or inhibition of p70S6K with systemic PF-4708671 after reactivation of cocaine contextual memory abolished the established cocaine place preference. Immunoprecipitation assays showed that reactivation of cocaine memory did not affect eIF4E-eIF4G interactions in nucleus accumbens or hippocampus. Levels of Arc mRNA were significantly elevated 60 and 120 min after cocaine memory reactivation and returned to baseline 24 h later. These findings demonstrate that mTORC1 and p70S6K are required for reconsolidation of cocaine contextual memory.
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Affiliation(s)
- Xiangdang Shi
- Center for Substance Abuse Research and Department of Neural Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, United States
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14
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Hong PP, Li C, Niu GJ, Zhao XF, Wang JX. White spot syndrome virus directly activates mTORC1 signaling to facilitate its replication via polymeric immunoglobulin receptor-mediated infection in shrimp. PLoS Pathog 2022; 18:e1010808. [PMID: 36067252 PMCID: PMC9481175 DOI: 10.1371/journal.ppat.1010808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 09/16/2022] [Accepted: 08/11/2022] [Indexed: 11/19/2022] Open
Abstract
Previous studies have shown that the mechanistic target of rapamycin complex 1 (mTORC1) signaling pathway has antiviral functions or is beneficial for viral replication, however, the detail mechanisms by which mTORC1 enhances viral infection remain unclear. Here, we found that proliferation of white spot syndrome virus (WSSV) was decreased after knockdown of mTor (mechanistic target of rapamycin) or injection inhibitor of mTORC1, rapamycin, in Marsupenaeus japonicus, which suggests that mTORC1 is utilized by WSSV for its replication in shrimp. Mechanistically, WSSV infects shrimp by binding to its receptor, polymeric immunoglobulin receptor (pIgR), and induces the interaction of its intracellular domain with Calmodulin. Calmodulin then promotes the activation of protein kinase B (AKT) by interaction with the pleckstrin homology (PH) domain of AKT. Activated AKT phosphorylates mTOR and results in the activation of the mTORC1 signaling pathway to promote its downstream effectors, ribosomal protein S6 kinase (S6Ks), for viral protein translation. Moreover, mTORC1 also phosphorylates eukaryotic translation initiation factor 4E-binding protein 1 (4EBP1), which will result in the separation of 4EBP1 from eukaryotic translation initiation factor 4E (eIF4E) for the translation of viral proteins in shrimp. Our data revealed a novel pathway for WSSV proliferation in shrimp and indicated that mTORC1 may represent a potential clinical target for WSSV control in shrimp aquaculture. White spot syndrome virus (WSSV) is the causative pathogen of white spot disease (WSD) and represents the most destructive viral disease of shrimp. The virus has evolved various strategies to escape from host defenses or exploit host biological pathways for its reproduction. Studies on viral immune-escape mechanisms can provide new strategies for disease prevention and control in shrimp aquaculture. Mechanistic target of rapamycin (mTOR) plays a central role in the regulation of cell growth and metabolism, which nucleates two distinct protein complexes, mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2) with diverse functions at different levels of the signaling pathway. mTORC1 is reported to be exploited by viruses in their reproduction. However, the detail mechanism remains unclear. In this study, we identified a new mechanism of mTOR being hijacked by WSSV in shrimp (Marsupenaeus japonicus). WSSV infects shrimp by its receptor, pIgR and induces the interaction of the intracellular domain of pIgR with Calmodulin. Calmodulin subsequently promotes the activation of AKT by interaction with the pleckstrin homology domain of the kinase. Activated AKT phosphorylates mTOR and results in the activation of the mTORC1 signaling pathway to promote its downstream effectors, S6Ks, for viral protein synthesis. Moreover, mTORC1 also phosphorylates 4EBP1, which results in the separation of 4EBP1 from eIF4E for the translation of viral proteins in shrimp. Our study reveals a novel strategy for WSSV proliferation in shrimp and indicates that the components of mTORC1 may represent potential clinical targets for WSSV control in shrimp aquaculture.
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Affiliation(s)
- Pan-Pan Hong
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, Shandong, China
| | - Cang Li
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, Shandong, China
| | - Guo-Juan Niu
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, Shandong, China
| | - Xiao-Fan Zhao
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, Shandong, China
| | - Jin-Xing Wang
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, Shandong, China
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
- * E-mail:
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15
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Becker T, Wiest A, Telek A, Bejko D, Hoffmann-Röder A, Kielkowski P. Transforming Chemical Proteomics Enrichment into a High-Throughput Method Using an SP2E Workflow. JACS AU 2022; 2:1712-1723. [PMID: 35911458 PMCID: PMC9326820 DOI: 10.1021/jacsau.2c00284] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Protein post-translational modifications (PTMs) play a critical role in the regulation of protein catalytic activity, localization, and protein-protein interactions. Attachment of PTMs onto proteins significantly diversifies their structure and function, resulting in proteoforms. However, the sole identification of post-translationally modified proteins, which are often cell type and disease-specific, is still a highly challenging task. Substoichiometric amounts and modifications of low abundant proteins necessitate the purification or enrichment of the modified proteins. Although the introduction of mass spectrometry-based chemical proteomic strategies has enabled the screening of protein PTMs with increased throughput, sample preparation remains highly time-consuming and tedious. Here, we report an optimized workflow for the enrichment of PTM proteins in a 96-well plate format, which could be extended to robotic automation. This platform allows us to significantly lower the input of total protein, which opens up the opportunity to screen specialized and difficult-to-culture cell lines in a high-throughput manner. The presented SP2E protocol is robust and time- and cost-effective, as well as suitable for large-scale screening of proteoforms. The application of the SP2E protocol will thus enable the characterization of proteoforms in various processes such as neurodevelopment, neurodegeneration, and cancer. This may contribute to an overall acceleration of the recently launched Human Proteoform Project.
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Affiliation(s)
- Tobias Becker
- Institute
for Chemical Epigenetics Munich, LMU Munich, 81375 Munich, Germany
| | - Andreas Wiest
- Institute
for Chemical Epigenetics Munich, LMU Munich, 81375 Munich, Germany
| | - András Telek
- Institute
for Chemical Epigenetics Munich, LMU Munich, 81375 Munich, Germany
| | - Daniel Bejko
- Institute
for Chemical Epigenetics Munich, LMU Munich, 81375 Munich, Germany
| | | | - Pavel Kielkowski
- Institute
for Chemical Epigenetics Munich, LMU Munich, 81375 Munich, Germany
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16
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Recent advances in metabolic regulation and bioengineering of gibberellic acid biosynthesis in Fusarium fujikuroi. World J Microbiol Biotechnol 2022; 38:131. [PMID: 35689127 DOI: 10.1007/s11274-022-03324-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 05/29/2022] [Indexed: 12/24/2022]
Abstract
The plant growth hormone gibberellic acid (GA3), as one of the representative secondary metabolites, is widely used in agriculture, horticulture and brewing industry. GA3 is detected in both plants and several fungi with the ability to stimulate plant growth. Currently, the main mode of industrial production of GA3 is depended on the microbial fermentation via long-period submerged fermentation using Fusarium fujikuroi as the only producing strain, qualified for its natural productivity. However, the demand of large-sale industrialization of GA3 was still restricted by the low productivity. The biosynthetic route of GA3 in F. fujikuroi is now well-defined. Furthermore, the multi-level regulation mechanisms involved in the whole network of GA3 production have also been gradually unveiled by the past two decades based on the identification and characterization of several global regulators and their mutual functions. Combined with the quick development of genetic manipulation techniques, the rational modification of producing strain F. fujikuroi development become practical for higher productivity achievement. Herein, we review the latest advances in the molecular regulation of GA3 biosynthesis in F. fujikuroi and conclude a comprehensive network involving nitrogen depression, global regulator, histone modification and G protein signaling pathway. Correspondingly, the bioengineering strategies covering conventional random mutation, genetic manipulating platform development, metabolic edition and fermentation optimization were also systematically proposed.
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Sun Y, Wang X, Liu T, Zhu X, Pan X. The multifaceted role of the SASP in atherosclerosis: from mechanisms to therapeutic opportunities. Cell Biosci 2022; 12:74. [PMID: 35642067 PMCID: PMC9153125 DOI: 10.1186/s13578-022-00815-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 05/15/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The global population of older individuals is growing, and ageing is a key risk factor for atherosclerotic cardiovascular diseases. Abnormal accumulation of senescent cells can cause potentially deleterious effects on the organism with age. As a vital marker of cellular senescence, the senescence-associated secretory phenotype (SASP) is a novel mechanism to link cellular senescence with atherosclerosis. MAIN BODY In this review, we concretely describe the characteristics of the SASP and its regulation mechanisms. Importantly, we provide novel perspectives on how the SASP can promote atherosclerosis. The SASP from different types of senescent cells have vital roles in atherosclerosis progression. As a significant mediator of the harmful effects of senescent cells, it can play a pro-atherogenic role by producing inflammation and immune dysfunction. Furthermore, the SASP can deliver senescence signals to the surrounding vascular cells, gradually contributing to the development of atherosclerosis. Finally, we focus on a variety of novel therapeutic strategies aimed to reduce the burden of atherosclerosis in elderly individuals by targeting senescent cells and inhibiting the regulatory mechanisms of the SASP. CONCLUSION This review systematically summarizes the multiple roles of the SASP in atherosclerosis and can contribute to the exploration of new therapeutic opportunities.
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Affiliation(s)
- Yu Sun
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
| | - Xia Wang
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
| | - Tianwei Liu
- Institute of Cerebrovascular Diseases, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
| | - Xiaoyan Zhu
- Department of Critical Care Medicine, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
| | - Xudong Pan
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
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Bowman RW, Jordahl EM, Davis S, Hedayati S, Barsouk H, Ozbaki-Yagan N, Chiang A, Li Y, O’Donnell AF. TORC1 Signaling Controls the Stability and Function of α-Arrestins Aly1 and Aly2. Biomolecules 2022; 12:biom12040533. [PMID: 35454122 PMCID: PMC9031309 DOI: 10.3390/biom12040533] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/22/2022] [Accepted: 03/25/2022] [Indexed: 02/06/2023] Open
Abstract
Nutrient supply dictates cell signaling changes, which in turn regulate membrane protein trafficking. To better exploit nutrients, cells relocalize membrane transporters via selective protein trafficking. Key in this reshuffling are the α-arrestins, selective protein trafficking adaptors conserved from yeast to man. α-Arrestins bind membrane proteins, controlling the ubiquitination and endocytosis of many transporters. To prevent the spurious removal of membrane proteins, α-arrestin-mediated endocytosis is kept in check through phospho-inhibition. This phospho-regulation is complex, with up to 87 phospho-sites on a single α-arrestin and many kinases/phosphatases targeting α-arrestins. To better define the signaling pathways controlling paralogous α-arrestins, Aly1 and Aly2, we screened the kinase and phosphatase deletion (KinDel) library, which is an array of all non-essential kinase and phosphatase yeast deletion strains, for modifiers of Aly-mediated phenotypes. We identified many Aly regulators, but focused our studies on the TORC1 kinase, a master regulator of nutrient signaling across eukaryotes. We found that TORC1 and its signaling effectors, the Sit4 protein phosphatase and Npr1 kinase, regulate the phosphorylation and stability of Alys. When Sit4 is lost, Alys are hyperphosphorylated and destabilized in an Npr1-dependent manner. These findings add new dimensions to our understanding of TORC1 regulation of α-arrestins and have important ramifications for cellular metabolism.
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Affiliation(s)
- Ray W. Bowman
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Eric M. Jordahl
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Sydnie Davis
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Stefanie Hedayati
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Hannah Barsouk
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Nejla Ozbaki-Yagan
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Annette Chiang
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
| | - Yang Li
- Department of Cell Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA;
| | - Allyson F. O’Donnell
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA; (R.W.B.II); (E.M.J.); (S.D.); (S.H.); (H.B.); (N.O.-Y.); (A.C.)
- Correspondence: ; Tel.: +1-412-648-4270
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Zheng Q, Duan L, Zhang Y, Li J, Zhang S, Wang H. A dynamically evolving war between autophagy and pathogenic microorganisms. J Zhejiang Univ Sci B 2022; 23:19-41. [PMID: 35029086 PMCID: PMC8758936 DOI: 10.1631/jzus.b2100285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Autophagy is an intracellular degradation process that maintains cellular homeostasis. It is essential for protecting organisms from environmental stress. Autophagy can help the host to eliminate invading pathogens, including bacteria, viruses, fungi, and parasites. However, pathogens have evolved multiple strategies to interfere with autophagic signaling pathways or inhibit the fusion of autophagosomes with lysosomes to form autolysosomes. Moreover, host cell matrix degradation by different types of autophagy can be used for the proliferation and reproduction of pathogens. Thus, determining the roles and mechanisms of autophagy during pathogen infections will promote understanding of the mechanisms of pathogen‒host interactions and provide new strategies for the treatment of infectious diseases.
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Affiliation(s)
- Qianqian Zheng
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Liangwei Duan
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Yang Zhang
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Jiaoyang Li
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Shiyu Zhang
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Hui Wang
- Henan Key Laboratory of Immunology and Targeted Drugs, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China. .,Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.
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20
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Byrnes K, Blessinger S, Bailey NT, Scaife R, Liu G, Khambu B. Therapeutic regulation of autophagy in hepatic metabolism. Acta Pharm Sin B 2022; 12:33-49. [PMID: 35127371 PMCID: PMC8799888 DOI: 10.1016/j.apsb.2021.07.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/04/2021] [Accepted: 07/09/2021] [Indexed: 02/07/2023] Open
Abstract
Metabolic homeostasis requires dynamic catabolic and anabolic processes. Autophagy, an intracellular lysosomal degradative pathway, can rewire cellular metabolism linking catabolic to anabolic processes and thus sustain homeostasis. This is especially relevant in the liver, a key metabolic organ that governs body energy metabolism. Autophagy's role in hepatic energy regulation has just begun to emerge and autophagy seems to have a much broader impact than what has been appreciated in the field. Though classically known for selective or bulk degradation of cellular components or energy-dense macromolecules, emerging evidence indicates autophagy selectively regulates various signaling proteins to directly impact the expression levels of metabolic enzymes or their upstream regulators. Hence, we review three specific mechanisms by which autophagy can regulate metabolism: A) nutrient regeneration, B) quality control of organelles, and C) signaling protein regulation. The plasticity of the autophagic function is unraveling a new therapeutic approach. Thus, we will also discuss the potential translation of promising preclinical data on autophagy modulation into therapeutic strategies that can be used in the clinic to treat common metabolic disorders.
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Key Words
- AIM, Atf8 interacting motif
- ATGL, adipose triglyceride lipase
- ATL3, Atlastin GTPase 3
- ATM, ATM serine/threonine kinase
- Autophagy
- BA, bile acid
- BCL2L13, BCL2 like 13
- BNIP3, BCL2 interacting protein 3
- BNIP3L, BCL2 interacting protein 3 like
- CAR, constitutive androstane receptor
- CCPG1, cell cycle progression 1
- CLN3, lysosomal/endosomal transmembrane protein
- CMA, chaperonin mediated autophagy
- CREB, cAMP response element binding protein
- CRY1, cryptochrome 1
- CYP27A1, sterol 27-hydroxylase
- CYP7A1, cholesterol 7α-hydroxylase
- Cryptochrome 1
- DFCP1, double FYVE-containing protein 1
- FAM134B, family with sequence similarity 134, member B
- FFA, free fatty acid
- FOXO1, Forkhead box O1
- FUNDC1, FUN14 domain containing 1
- FXR, farnesoid X receptor
- Farnesoid X receptor
- GABARAPL1, GABA type A receptor associated protein like 1
- GIM, GABARAP-interacting motif
- LAAT-1, lysosomal amino acid transporter 1 homologue
- LALP70, lysosomal apyrase-like protein of 70 kDa
- LAMP1, lysosomal-associated membrane protein-1
- LAMP2, lysosomal-associated membrane protein-2
- LD, lipid droplet
- LIMP1, lysosomal integral membrane protein-1
- LIMP3, lysosomal integral membrane protein-3
- LIR, LC3 interacting region
- LXRa, liver X receptor a
- LYAAT-1, lysosomal amino acid transporter 1
- Liver metabolism
- Lysosome
- MCOLN1, mucolipin 1
- MFSD1, major facilitator superfamily domain containing 1
- NAFLD, non-alcoholic fatty liver disease
- NBR1, BRCA1 gene 1 protein
- NCoR1, nuclear receptor co-repressor 1
- NDP52, calcium-binding and coiled-coil domain-containing protein 2
- NPC-1, Niemann-Pick disease, type C1
- Nutrient regeneration
- OPTN, optineurin
- PEX5, peroxisomal biogenesis factor 5
- PI3K, phosphatidylinositol-4,5-bisphosphate 3-kinase
- PINK1, phosphatase and tensin homolog (PTEN)-induced kinase 1
- PKA, protein kinase A
- PKB, protein kinase B
- PLIN2, perilipin 2
- PLIN3, perilipin 3
- PP2A, protein phosphatase 2a
- PPARα, peroxisomal proliferator-activated receptor-alpha
- PQLC2, PQ-loop protein
- PXR, pregnane X receptor
- Quality control
- RETREG1, reticulophagy regulator 1
- ROS, reactive oxygen species
- RTN3, reticulon 3
- RTNL3, a long isoform of RTN3
- S1PR2, sphingosine-1-phosphate receptor 2
- S6K, P70-S6 kinase
- S6RP, S6 ribosomal protein
- SCARB2, scavenger receptor class B member 2
- SEC62, SEC62 homolog, preprotein translocation factor
- SIRT1, sirtuin 1
- SLC36A1, solute carrier family 36 member 1
- SLC38A7, solute carrier family 38 member 7
- SLC38A9, sodium-coupled neutral amino acid transporter 9
- SNAT7, sodium-coupled neutral amino acid transporter 7
- SPIN, spindling
- SQSTM1, sequestosome 1
- STBD1, starch-binding domain-containing protein 1
- Signaling proteins
- TBK1, serine/threonine-protein kinase
- TEX264, testis expressed 264, ER-phagy receptor
- TFEB/TFE3, transcription factor EB
- TGR5, takeda G protein receptor 5
- TRAC-1, thyroid-hormone-and retinoic acid-receptor associated co-repressor 1
- TRPML1, transient receptor potential mucolipin 1
- ULK1, Unc-51 like autophagy activating kinase 1
- UPR, unfolded protein response
- V-ATPase, vacuolar-ATPase
- VDR, vitamin D3 receptor
- VLDL, very-low-density lipoprotein
- WIPI1, WD repeat domain phosphoinositide-interacting protein 1
- mTORC1, mammalian target of rapamycin complex 1
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21
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Ellingson BM, Wen PY, Cloughesy TF. Therapeutic Response Assessment of High-Grade Gliomas During Early-Phase Drug Development in the Era of Molecular and Immunotherapies. Cancer J 2021; 27:395-403. [PMID: 34570454 PMCID: PMC8480435 DOI: 10.1097/ppo.0000000000000543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Several new therapeutic strategies have emerged over the past decades to address unmet clinical needs in high-grade gliomas, including targeted molecular agents and various forms of immunotherapy. Each of these strategies requires addressing fundamental questions, depending on the stage of drug development, including ensuring drug penetration into the brain, engagement of the drug with the desired target, biologic effects downstream from the target including metabolic and/or physiologic changes, and identifying evidence of clinical activity that could be expanded upon to increase the likelihood of a meaningful survival benefit. The current review article highlights these strategies and outlines how imaging technology can be used for therapeutic response evaluation in both targeted and immunotherapies in early phases of drug development in high-grade gliomas.
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Affiliation(s)
- Benjamin M. Ellingson
- UCLA Brain Tumor Imaging Laboratory (BTIL), Center for Computer Vision and Imaging Biomarkers, Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA
| | - Patrick Y. Wen
- Center for Neuro-Oncology, Dana-Farber Cancer Institute, Harvard University, Boston, MA
| | - Timothy F. Cloughesy
- UCLA Neuro Oncology Program, Department of Neurology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA
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22
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Sun XL, Zhang JB, Guo YX, Xia TS, Xu LC, Rahmand K, Wang GP, Li XJ, Han T, Wang NN, Xin HL. Xanthohumol ameliorates memory impairment and reduces the deposition of β-amyloid in APP/PS1 mice via regulating the mTOR/LC3II and Bax/Bcl-2 signalling pathways. J Pharm Pharmacol 2021; 73:1230-1239. [PMID: 33909081 DOI: 10.1093/jpp/rgab052] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 02/25/2021] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Xanthohumol (XAN) is a unique component of Humulus lupulus L. and is known for its diverse biological activities. In this study, we investigated whether Xanthohumol could ameliorate memory impairment of APP/PS1 mice, and explored its potential mechanism of action. METHODS APP/PS1 mice were used for in vivo test and were treated with N-acetylcysteine and Xanthohumol for 2 months. Learning and memory levels were evaluated by the Morris water maze. Inflammatory and oxidative markers in serum and hippocampus and the deposition of Aβ in the hippocampus were determined. Moreover, the expression of autophagy and apoptosis proteins was also evaluated by western blot. KEY FINDINGS Xanthohumol significantly reduced the latency and increased the residence time of mice in the target quadrant. Additionally, Xanthohumol increased superoxide dismutase level and reduced Interleukin-6 and Interleukin-1β levels both in serum and hippocampus. Xanthohumol also significantly reduced Aβ deposition in the hippocampus and activated autophagy and anti-apoptotic signals. CONCLUSIONS Xanthohumol effectively ameliorates memory impairment of APP/PS1 mice by activating mTOR/LC3 and Bax/Bcl-2 signalling pathways, which provides new insight into the neuroprotective effects of Xanthohumol.
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Affiliation(s)
- Xiao-Lei Sun
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina.,School of Pharmacy, Shandong University of Traditional Chinese Medicine, JinanChina
| | - Jia-Bao Zhang
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
| | - Yun-Xiang Guo
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
| | - Tian-Shuang Xia
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
| | - Ling-Chuan Xu
- School of Pharmacy, Shandong University of Traditional Chinese Medicine, JinanChina
| | - Khalid Rahmand
- Faculty of Science, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Guo-Ping Wang
- Xinjiang Institute of Chinese Materia Medica, Urumqi, China
| | - Xiao-Jin Li
- Xinjiang Institute of Chinese Materia Medica, Urumqi, China
| | - Ting Han
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
| | - Na-Ni Wang
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
| | - Hai-Liang Xin
- Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, ShanghaiChina
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23
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Shin HJ, Jo MJ, Jin IS, Park CW, Kim JS, Shin DH. Optimization and Pharmacokinetic Evaluation of Synergistic Fenbendazole and Rapamycin Co-Encapsulated in Methoxy Poly(Ethylene Glycol)- b-Poly(Caprolactone) Polymeric Micelles. Int J Nanomedicine 2021; 16:4873-4889. [PMID: 34295160 PMCID: PMC8291852 DOI: 10.2147/ijn.s315782] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/02/2021] [Indexed: 12/18/2022] Open
Abstract
Purpose We aimed to develop a nanocarrier formulation incorporating fenbendazole (FEN) and rapamycin (RAPA) with strong efficacy against A549 cancer cells. As FEN and RAPA are poorly soluble in water, it is difficult to apply them clinically in vivo. Therefore, we attempted to resolve this problem by encapsulating these drugs in polymeric micelles. Methods We evaluated drug synergy using the combination index (CI) values of various molar ratios of FEN and RAPA. We formed and tested micelles composed of different polymers. Moreover, we conducted cytotoxicity, stability, release, pharmacokinetic, and biodistribution studies to investigate the antitumor effects of FEN/RAPA-loaded mPEG-b-PCL micelles. Results We selected mPEG-b-PCL-containing FEN and RAPA at a molar ratio of 1:2 because these particles were consistent in size and had high encapsulation efficiency (EE, %) and drug loading (DL, %) capacity. The in vitro cytotoxicity was assessed for various FEN, RAPA, and combined FEN/RAPA formulations. After long-term exposures, both the solutions and the micelles had similar efficacy against A549 cancer cells. The in vivo pharmacokinetic study revealed that FEN/RAPA-loaded mPEG-b-PCL micelles had a relatively higher area under the plasma concentration–time curve from 0 to 2 h (AUC0–2 h) and 0 to 8 h (AUC0–8 h) and plasma concentration at time zero (Co) than that of the FEN/RAPA solution. The in vivo biodistribution assay revealed that the IV injection of FEN/RAPA-loaded mPEG-b-PCL micelles resulted in lower pulmonary FEN concentration than the IV injection of the FEN/RAPA solution. Conclusion When FEN and RAPA had a 1:2 molar ratio, they showed synergism. Additionally, using data from in vitro cytotoxicity, synergism between a 1:2 molar ratio of FEN and RAPA was observed in the micelle formulation. The FEN/RAPA-loaded mPEG-b-PCL micelle had enhanced bioavailability than the FEN/RAPA solution.
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Affiliation(s)
- Hee Ji Shin
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Republic of Korea
| | - Min Jeong Jo
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Republic of Korea
| | - Ik Sup Jin
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Republic of Korea
| | - Chun-Woong Park
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Republic of Korea
| | - Jin-Seok Kim
- Drug Information Research Institute (DIRI), College of Pharmacy, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Dae Hwan Shin
- College of Pharmacy, Chungbuk National University, Cheongju, 28160, Republic of Korea
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24
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Meng N, Mu X, Gong Y, Wang YH, Zhang J, Wang MH, Yang FY, Jiang CS, Zhang H. Autophagy Induced by a Novel Triazol Derivative Promotes Angiogenesis Through Decreasing Interferon-Inducible Protein 10 Level in Vascular Endothelial Cells. J Cardiovasc Pharmacol 2021; 78:e136-e146. [PMID: 34009854 DOI: 10.1097/fjc.0000000000001034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 04/02/2021] [Indexed: 11/26/2022]
Abstract
ABSTRACT Autophagy plays an important role in angiogenesis, whereas the mechanisms of vascular endothelial cell (VEC) autophagy associated with angiogenesis remain unclear. In this study, we identified a novel triazol derivative (JL025) that significantly promoted angiogenesis both in vitro and in vivo. Moreover, JL025 had no effects on cell proliferation but dramatically increased the autophagy level of VEC. The suppression of autophagy inhibited JL025-induced angiogenesis in vitro and in vivo, suggesting that JL025-induced angiogenesis was dependent on the enhanced autophagy. Mechanistic studies indicated that JL025-induced VEC autophagy was related to the Protein Kinase B/mTOR signaling pathway. Meanwhile, JL025 decreased the antiangiogenic chemokine interferon-inducible protein 10 (IP10) protein level in human VECs. Importantly, the suppression of autophagy inhibited JL025-induced decrease of IP10 protein level, indicating that autophagy mediated the degradation of IP10. Taken together, our findings provide new insights into the relationship of VEC autophagy with angiogenesis, and JL025 may have a therapeutic potential in related diseases.
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Affiliation(s)
- Ning Meng
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Xin Mu
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Yan Gong
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Yan Hong Wang
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Juan Zhang
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Mao Hua Wang
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
| | - Feng Ying Yang
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Cheng Shi Jiang
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
| | - Hua Zhang
- Department of Vascuar Surgery, School of Biological Science and Technology, University of Jinan, Jinan, China; and
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25
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Thapa N, Chaudhari M, Iannetta AA, White C, Roy K, Newman RH, Hicks LM, Kc DB. A deep learning based approach for prediction of Chlamydomonas reinhardtii phosphorylation sites. Sci Rep 2021; 11:12550. [PMID: 34131195 PMCID: PMC8206365 DOI: 10.1038/s41598-021-91840-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 05/28/2021] [Indexed: 11/23/2022] Open
Abstract
Protein phosphorylation, which is one of the most important post-translational modifications (PTMs), is involved in regulating myriad cellular processes. Herein, we present a novel deep learning based approach for organism-specific protein phosphorylation site prediction in Chlamydomonas reinhardtii, a model algal phototroph. An ensemble model combining convolutional neural networks and long short-term memory (LSTM) achieves the best performance in predicting phosphorylation sites in C. reinhardtii. Deemed Chlamy-EnPhosSite, the measured best AUC and MCC are 0.90 and 0.64 respectively for a combined dataset of serine (S) and threonine (T) in independent testing higher than those measures for other predictors. When applied to the entire C. reinhardtii proteome (totaling 1,809,304 S and T sites), Chlamy-EnPhosSite yielded 499,411 phosphorylated sites with a cut-off value of 0.5 and 237,949 phosphorylated sites with a cut-off value of 0.7. These predictions were compared to an experimental dataset of phosphosites identified by liquid chromatography-tandem mass spectrometry (LC–MS/MS) in a blinded study and approximately 89.69% of 2,663 C. reinhardtii S and T phosphorylation sites were successfully predicted by Chlamy-EnPhosSite at a probability cut-off of 0.5 and 76.83% of sites were successfully identified at a more stringent 0.7 cut-off. Interestingly, Chlamy-EnPhosSite also successfully predicted experimentally confirmed phosphorylation sites in a protein sequence (e.g., RPS6 S245) which did not appear in the training dataset, highlighting prediction accuracy and the power of leveraging predictions to identify biologically relevant PTM sites. These results demonstrate that our method represents a robust and complementary technique for high-throughput phosphorylation site prediction in C. reinhardtii. It has potential to serve as a useful tool to the community. Chlamy-EnPhosSite will contribute to the understanding of how protein phosphorylation influences various biological processes in this important model microalga.
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Affiliation(s)
- Niraj Thapa
- Department of Computational Data Science and Engineering, North Carolina A&T State University, Greensboro, NC, USA
| | - Meenal Chaudhari
- Department of Computational Data Science and Engineering, North Carolina A&T State University, Greensboro, NC, USA
| | - Anthony A Iannetta
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Clarence White
- Department of Computational Data Science and Engineering, North Carolina A&T State University, Greensboro, NC, USA
| | - Kaushik Roy
- Department of Computer Science, North Carolina A&T State University, Greensboro, NC, USA
| | - Robert H Newman
- Department of Biology, North Carolina A&T State University, Greensboro, NC, USA
| | - Leslie M Hicks
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Dukka B Kc
- Electrical Engineering and Computer Science Department, Wichita State University, Wichita, KS, USA.
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26
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Zhou Y, Guo J, Wang X, Cheng Y, Guan J, Barman P, Sun MA, Fu Y, Wei W, Feng C, Lilly MA, Wei Y. FKBP39 controls nutrient dependent Nprl3 expression and TORC1 activity in Drosophila. Cell Death Dis 2021; 12:571. [PMID: 34078879 PMCID: PMC8172852 DOI: 10.1038/s41419-021-03860-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 01/07/2023]
Abstract
Target of Rapamycin Complex 1 (TORC1) is a master regulator that coordinates nutrient status with cell metabolism. The GTPase-activating protein towards Rags complex 1 (GATOR1) inhibits TORC1 activity and protects cells from damage during periods of stress. Here we characterize multiple pathways that regulate the expression of the GATOR1 component Nprl3 in Drosophila. We determine that the stability of Nprl3 is impacted by the Unassembled Soluble Complex Proteins Degradation (USPD) pathway. In addition, we find that FK506 binding protein 39 (FKBP39)-dependent proteolytic destruction maintains Nprl3 at low levels in nutrient replete conditions. Nutrient starvation abrogates the degradation of the Nprl3 protein and rapidly promotes Nprl3 accumulation. Consistent with a role in promoting the stability of a TORC1 inhibitor, mutations in fkbp39 decrease TORC1 activity and increase autophagy. Finally, we show that the 5′UTR of nprl3 transcripts contain a functional upstream open reading frame (uORF) that inhibits main ORF translation. In summary, our work has uncovered novel mechanisms of Nprl3 regulation and identifies an important role for FKBP39 in the control of cellular metabolism.
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Affiliation(s)
- Ying Zhou
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Jian Guo
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Xinyu Wang
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Yang Cheng
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Jianwen Guan
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Priyam Barman
- Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Ming-An Sun
- Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Yuanyuan Fu
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Wanhong Wei
- Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Congjing Feng
- College of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China
| | - Mary A Lilly
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, 20892, USA.
| | - Youheng Wei
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China. .,Animal Physiology Group, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China.
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27
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Guo SH, Liu YM, Wang ZY, Wang FF, Mao YK, Hu YW, Han P, Cuthbertson AGS, Qiu BL, Sang W. Transcriptome analysis reveals TOR signalling-mediated plant flush shoots governing Diaphorina citri Kuwayama oviposition. INSECT MOLECULAR BIOLOGY 2021; 30:264-276. [PMID: 33410566 DOI: 10.1111/imb.12693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 12/31/2020] [Accepted: 01/04/2021] [Indexed: 06/12/2023]
Abstract
Asian Citrus Psyllid (ACP), Diaphorina citri, is a key vector transmitting the causative agent of Huanglongbing (HLB) disease. Population growth of ACP is evident after feeding on plant flush shoots, as they only oviposit here. However, the underlying mechanism as to why flush shoots govern oviposition is unclear. This study compares the fecundity and ovarian morphology of ACP between young flush and mature leaves. Furthermore, the transcriptome of mated females infesting Murraya paniculata was analysed. Finally, the gene of the key Target of Rapamycin (TOR) signalling pathway was silenced by RNAi. Results indicated that flush shoot feeding activated the development of the psyllids ovary and therefore induced oviposition. A total of 126 and 2794 differentially expressed genes were detected at 1 and 5 days, respectively, after pest infestation of flush shoots compared to mature leaves. Many genes are involved in protein metabolism, Mitogen-Activated Protein Kinase (MAPK) signalling pathway, hormone synthesis, and TOR signalling pathway: all thought to activate reproduction. Silencing of the positive regulator gene DcRheb in the TOR pathway resulted in lower levels of ecdysone and juvenile hormone and decreased vitellogenin synthesis, further disrupting reproductive ability. This study enhances understanding of the molecular mechanism underlying ACP's reproductive strategy.
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Affiliation(s)
- S-H Guo
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
| | - Y-M Liu
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
| | - Z-Y Wang
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
| | - F-F Wang
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
| | - Y-K Mao
- Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute), Guangzhou, China
| | - Y-W Hu
- Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute), Guangzhou, China
| | - P Han
- CAS Key Laboratory of Biogeography and Bioresource in Arid Land, Chinese Academy of Sciences, Ürümqi, China
| | | | - B-L Qiu
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
| | - W Sang
- Key Laboratory of Bio-Pesticide Creation and Application, South China Agricultural University, Guangzhou, China
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Glucose starvation greatly enhances antiproliferative and antiestrogenic potency of oligomycin A in MCF-7 breast cancer cells. Biochimie 2021; 186:51-58. [PMID: 33872751 DOI: 10.1016/j.biochi.2021.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 11/22/2022]
Abstract
Energy imbalance is one of the key properties of tumour cells, which in certain cases supports fast cancer progression and resistance to therapy. The simultaneous blocking of glycolytic processes and oxidative phosphorylation pathways seems to be a promising strategy for antitumor therapies. The study aimed to evaluate the effect of glucose starvation on the antiproliferative and antiestrogenic potency of oligomycin A against hormone-dependent breast cancer cells. Cell viability was assessed by the MTT test. Estrogen receptor alpha (ERα) activity was evaluated by reporter assay. mTOR, AMPK, Akt, and S6 kinase expression was assessed by immunoblotting. Glucose starvation caused multiple increases in the antiproliferative potency of oligomycin A in the hormone-dependent breast cancer MCF-7 cells, while its effect on the sensitivity of the second hormone-dependent cancer cell line, named T47D, was weak and limited. Glycolytic inhibitors, 3-bromopyruvate and 2-deoxyglucose, greatly enhanced the antiproliferative potency of oligomycin A in MCF-7 cells. Glucose starvation leads to remarkable activation of Akt in MCF-7 cells, whereas oligomycin A enhances its effect. The mTOR, S6 kinase, and AMPK signalling pathways are significantly modulated by oligomycin A under glucose starvation. Oligomycin A demonstrates more pronounced antiestrogenic effects under glucose starvation. Thus, glucose starvation and pharmacological inhibition of glycolysis are of interest for revealing the antitumor potential of macrolide oligomycin A against hormone-dependent breast cancers.
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Pang AP, Wang H, Zhang F, Hu X, Wu FG, Zhou Z, Wang W, Lu Z, Lin F. High-dose rapamycin exerts a temporary impact on T. reesei RUT-C30 through gene trFKBP12. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:77. [PMID: 33771193 PMCID: PMC8004424 DOI: 10.1186/s13068-021-01926-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 03/11/2021] [Indexed: 05/15/2023]
Abstract
BACKGROUND Knowledge with respect to regulatory systems for cellulase production is prerequisite for exploitation of such regulatory networks to increase cellulase production, improve fermentation efficiency and reduce the relevant production cost. The target of rapamycin (TOR) signaling pathway is considered as a central signaling hub coordinating eukaryotic cell growth and metabolism with environmental inputs. However, how and to what extent the TOR signaling pathway and rapamycin are involved in cellulase production remain elusive. RESULT At the early fermentation stage, high-dose rapamycin (100 μM) caused a temporary inhibition effect on cellulase production, cell growth and sporulation of Trichoderma reesei RUT-C30 independently of the carbon sources, and specifically caused a tentative morphology defect in RUT-C30 grown on cellulose. On the contrary, the lipid content of T. reesei RUT-C30 was not affected by rapamycin. Accordingly, the transcriptional levels of genes involved in the cellulase production were downregulated notably with the addition of rapamycin. Although the mRNA levels of the putative rapamycin receptor trFKBP12 was upregulated significantly by rapamycin, gene trTOR (the downstream effector of the rapamycin-FKBP12 complex) and genes associated with the TOR signaling pathways were not changed markedly. With the deletion of gene trFKBP12, there is no impact of rapamycin on cellulase production, indicating that trFKBP12 mediates the observed temporary inhibition effect of rapamycin. CONCLUSION Our study shows for the first time that only high-concentration rapamycin induced a transient impact on T. reesei RUT-C30 at its early cultivation stage, demonstrating T. reesei RUT-C30 is highly resistant to rapamycin, probably due to that trTOR and its related signaling pathways were not that sensitive to rapamycin. This temporary influence of rapamycin was facilitated by gene trFKBP12. These findings add to our knowledge on the roles of rapamycin and the TOR signaling pathways play in T. reesei.
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Affiliation(s)
- Ai-Ping Pang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Haiyan Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Funing Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Xin Hu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Fu-Gen Wu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Zhihua Zhou
- Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Wei Wang
- State Key Lab of Bioreactor Engineering, New World Institute of Biotechnology, East China University of Science and Technology, Shanghai, China
| | - Zuhong Lu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Fengming Lin
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
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Negroni MA, Macit MN, Stoldt M, Feldmeyer B, Foitzik S. Molecular regulation of lifespan extension in fertile ant workers. Philos Trans R Soc Lond B Biol Sci 2021; 376:20190736. [PMID: 33678017 DOI: 10.1098/rstb.2019.0736] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The evolution of sociality in insects caused a divergence in lifespan between reproductive and non-reproductive castes. Ant queens can live for decades, while most workers survive only weeks to a few years. In most organisms, longevity is traded-off with reproduction, but in social insects, these two life-history traits are positively linked. Once fertility is induced in workers, e.g. by queen removal, worker lifespan increases. The molecular regulation of this positive link between fecundity and longevity and generally the molecular underpinnings of caste-specific senescence are not well understood. Here, we investigate the transcriptomic regulation of lifespan and reproduction in fat bodies of three worker groups in the ant Temnothorax rugatulus. In a long-term experiment, workers that became fertile in the absence of the queen showed increased survival and upregulation of genes involved in longevity and fecundity pathways. Interestingly, workers that re-joined their queen after months exhibited intermediate ovary development, but retained a high expression of longevity and fecundity genes. Strikingly, the queen's presence causes a general downregulation of genes in worker fat bodies. Our findings point to long-term consequences of fertility induction in workers, even after re-joining their queen. Moreover, we reveal longevity genes and pathways modulated during insect social evolution. This article is part of the theme issue 'Ageing and sociality: why, when and how does sociality change ageing patterns?'
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Affiliation(s)
- Matteo Antoine Negroni
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University, Mainz, Germany
| | - Maide Nesibe Macit
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University, Mainz, Germany
| | - Marah Stoldt
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University, Mainz, Germany
| | - Barbara Feldmeyer
- Senckenberg Biodiversity and Climate Research Centre, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, 60325 Frankfurt am Main, Germany
| | - Susanne Foitzik
- Institute of Organismic and Molecular Evolution, Johannes Gutenberg University, Mainz, Germany
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Ellison A, Pouv A, Pace DA. Different protein metabolic strategies for growth during food-induced physiological plasticity in echinoid larvae. J Exp Biol 2021; 224:jeb.230748. [PMID: 33526554 DOI: 10.1242/jeb.230748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 01/21/2021] [Indexed: 11/20/2022]
Abstract
Food-induced morphological plasticity, a type of developmental plasticity, is a well-documented phenomenon in larvae of the echinoid echinoderm, Dendraster excentricus A recent study in our lab has shown that this morphological plasticity is associated with significant physiological plasticity for growth. The goal of the current study was to measure several aspects of protein metabolism in larvae growing at different rates to understand the mechanistic basis for this physiological growth plasticity. Larvae of D. excentricus were fed rations of 1000 algal cells ml-1 (low-fed larvae) or 10,000 algal cells ml-1 (high-fed larvae). Relative protein growth rate was 6.0 and 12.2% day-1 for low- and high-fed larvae, respectively. The energetic cost of protein synthesis was similar for the two treatments at 4.91 J mg-1 protein synthesized. Larvae in both treatments used about 50% of their metabolic energy production to fuel protein synthesis. Mass-specific rates of protein synthesis were also similar. Large differences in mass-specific rates of protein degradation were observed. Low-fed larvae had relatively low rates of degradation early in development that increased with larval age, surpassing those of high-fed larvae at 20 days post-fertilization. Changes in protein depositional efficiency during development were similar to those of larval growth efficiency, indicating that differences in protein metabolism are largely responsible for whole-organism growth plasticity. Low-fed larvae also had alanine transport rates that were 2 times higher than those of high-fed larvae. In total, these results provide an explanation for the differences in growth efficiency between low- and high-fed larvae and allow for a more integrated understanding of developmental plasticity in echinoid larvae.
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Affiliation(s)
- Aimee Ellison
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90084, USA
| | - Amara Pouv
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90084, USA
| | - Douglas A Pace
- Department of Biological Sciences, California State University Long Beach, Long Beach, CA 90084, USA
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Wang Y, Liu Z, Shu S, Cai J, Tang C, Dong Z. AMPK/mTOR Signaling in Autophagy Regulation During Cisplatin-Induced Acute Kidney Injury. Front Physiol 2020; 11:619730. [PMID: 33391038 PMCID: PMC7773913 DOI: 10.3389/fphys.2020.619730] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 11/27/2020] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a conserved, multistep pathway that degrades and recycles dysfunctional organelles and macromolecules to maintain cellular homeostasis. Mammalian target of rapamycin (mTOR) and adenosine-monophosphate activated-protein kinase (AMPK) are major negative and positive regulators of autophagy, respectively. In cisplatin-induced acute kidney injury (AKI) or nephrotoxicity, autophagy is rapidly induced in renal tubular epithelial cells and acts as a cytoprotective mechanism for cell survival. Both mTOR and AMPK have been implicated in the regulation of autophagy in cisplatin-induced AKI. Targeting mTOR and/or AMPK may offer effective strategies for kidney protection during cisplatin-mediated chemotherapy.
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Affiliation(s)
- Ying Wang
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China
| | - Zhiwen Liu
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China
| | - Shaoqun Shu
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China
| | - Juan Cai
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China
| | - Chengyuan Tang
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China
| | - Zheng Dong
- Department of Nephrology, The Second Xiangya Hospital at Central South University, Changsha, China.,Department of Cellular Biology and Anatomy, Charlie Norwood Veterans Affair Medical Center, Medical College of Georgia, Augusta University, Augusta, GA, United States
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Algorithms for ribosome traffic engineering and their potential in improving host cells' titer and growth rate. Sci Rep 2020; 10:21202. [PMID: 33273552 PMCID: PMC7713304 DOI: 10.1038/s41598-020-78260-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 11/20/2020] [Indexed: 11/08/2022] Open
Abstract
mRNA translation is a fundamental cellular process consuming most of the intracellular energy; thus, it is under extensive evolutionary selection for optimization, and its efficiency can affect the host's growth rate. We describe a generic approach for improving the growth rate (fitness) of any organism by introducing synonymous mutations based on comprehensive computational models. The algorithms introduce silent mutations that may improve the allocation of ribosomes in the cells via the decreasing of their traffic jams during translation respectively. As a result, resources availability in the cell changes leading to improved growth-rate. We demonstrate experimentally the implementation of the method on Saccharomyces cerevisiae: we show that by introducing a few mutations in two computationally selected genes the mutant's titer increased. Our approach can be employed for improving the growth rate of any organism providing the existence of data for inferring models, and with the relevant genomic engineering tools; thus, it is expected to be extremely useful in biotechnology, medicine, and agriculture.
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Moya NA, Tanner MK, Smith AM, Balolia A, Davis JKP, Bonar K, Jaime J, Hubert T, Silva J, Whitworth W, Loetz EC, Bland ST, Greenwood BN. Acute exercise enhances fear extinction through a mechanism involving central mTOR signaling. Neurobiol Learn Mem 2020; 176:107328. [PMID: 33075479 PMCID: PMC7718627 DOI: 10.1016/j.nlm.2020.107328] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 09/12/2020] [Accepted: 10/13/2020] [Indexed: 01/02/2023]
Abstract
Impaired fear extinction, combined with the likelihood of fear relapse after exposure therapy, contributes to the persistence of many trauma-related disorders such as anxiety and post-traumatic stress disorder. Identifying mechanisms to aid fear extinction and reduce relapse could provide novel strategies for augmentation of exposure therapy. Exercise can enhance learning and memory and augment fear extinction of traumatic memories in humans and rodents. One factor that could contribute to enhanced fear extinction following exercise is the mammalian target of rapamycin (mTOR). mTOR is a translation regulator involved in synaptic plasticity and is sensitive to many exercise signals such as monoamines, growth factors, and cellular metabolism. Further, mTOR signaling is increased after chronic exercise in brain regions involved in learning and emotional behavior. Therefore, mTOR is a compelling potential facilitator of the memory-enhancing and overall beneficial effects of exercise on mental health.The goal of the current study is to test the hypothesis that mTOR signaling is necessary for the enhancement of fear extinction produced by acute, voluntary exercise. We observed that intracerebral-ventricular administration of the mTOR inhibitor rapamycin reduced immunoreactivity of phosphorylated S6, a downstream target of mTOR, in brain regions involved in fear extinction and eliminated the enhancement of fear extinction memory produced by acute exercise, without reducing voluntary exercise behavior or altering fear extinction in sedentary rats. These results suggest that mTOR signaling contributes to exercise-augmentation of fear extinction.
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Affiliation(s)
- Nicolette A Moya
- Department of Psychology, University of Colorado Denver, USA; Department of Integrative Biology, University of Colorado Denver, USA
| | - Margaret K Tanner
- Department of Psychology, University of Colorado Denver, USA; Department of Integrative Biology, University of Colorado Denver, USA
| | - Abigail M Smith
- Department of Psychology, University of Colorado Denver, USA
| | - Aleezah Balolia
- Department of Psychology, University of Colorado Denver, USA; Department of Integrative Biology, University of Colorado Denver, USA
| | | | - Kelsey Bonar
- Department of Psychology, University of Colorado Denver, USA
| | - Jennifer Jaime
- Department of Psychology, University of Colorado Denver, USA
| | - Troy Hubert
- Department of Psychology, University of Colorado Denver, USA
| | - Jorge Silva
- Department of Psychology, University of Colorado Denver, USA
| | | | - Esteban C Loetz
- Department of Psychology, University of Colorado Denver, USA
| | - Sondra T Bland
- Department of Psychology, University of Colorado Denver, USA
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Abstract
Liver cancer is a global problem and hepatocellular carcinoma (HCC) accounts for about 85% of this cancer. In the USA, etiologies and risk factors for HCC include chronic hepatitis C virus (HCV) infection, diabetes, non-alcoholic steatohepatitis (NASH), obesity, excessive alcohol drinking, exposure to tobacco smoke, and genetic factors. Chronic HCV infection appears to be associated with about 30% of HCC. Chronic HCV infection induces multistep changes in liver, involving metabolic disorders, steatosis, cirrhosis and HCC. Liver carcinogenesis requires initiation of neoplastic clones, and progression to clinically diagnose malignancy. Tumor progression associates with profound exhaustion of tumor-antigen-specific CD8+T cells, and accumulation of PD-1hi CD8+T cells and Tregs. In this chapter, we provide a brief description of HCV and environmental/genetic factors, immune regulation, and highlight mechanisms of HCV associated HCC. We also underscore HCV treatment and recent paradigm of HCC progression, highlighted the current treatment and potential future therapeutic opportunities.
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36
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Carolina de Souza-Guerreiro T, Meng X, Dacheux E, Firczuk H, McCarthy J. Translational control of gene expression noise and its relationship to ageing in yeast. FEBS J 2020; 288:2278-2293. [PMID: 33090724 DOI: 10.1111/febs.15594] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 09/30/2020] [Accepted: 10/07/2020] [Indexed: 11/29/2022]
Abstract
Gene expression noise influences organism evolution and fitness but is poorly understood. There is increasing evidence that the functional roles of components of the translation machinery influence noise intensity. In addition, modulation of the activities of at least some of these same components affects the replicative lifespan of a broad spectrum of organisms. In a novel comparative approach, we modulate the activities of the translation initiation factors eIFG1 and eIF4G2, both of which are involved in the process of recruiting ribosomal 43S preinitiation complexes to the 5' end of eukaryotic mRNAs. We show that tagging of the cell wall using a fluorescent dye allows us to follow gene expression noise as different yeast strains progress through successive cycles of replicative ageing. This procedure reveals a relationship between global protein synthesis rate and gene expression noise (cell-to-cell heterogeneity), which is accompanied by a parallel correlation between gene expression noise and the replicative age of mother cells. An alternative approach, based on microfluidics, confirms the interdependence between protein synthesis rate, gene expression noise and ageing. We additionally show that it is important to characterize the influence of the design of the microfluidic device on the nutritional state of the cells during such experiments. Analysis of the noise data derived from flow cytometry and fluorescence microscopy measurements indicates that both the intrinsic and the extrinsic noise components increase as a function of ageing.
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Affiliation(s)
| | - Xiang Meng
- Warwick Integrative Synthetic Biology Centre (WISB) and School of Life Sciences, University of Warwick, Coventry, UK
| | - Estelle Dacheux
- Warwick Integrative Synthetic Biology Centre (WISB) and School of Life Sciences, University of Warwick, Coventry, UK
| | - Helena Firczuk
- Warwick Integrative Synthetic Biology Centre (WISB) and School of Life Sciences, University of Warwick, Coventry, UK
| | - John McCarthy
- Warwick Integrative Synthetic Biology Centre (WISB) and School of Life Sciences, University of Warwick, Coventry, UK
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Riccardi C, Perrone L, Napolitano F, Sampaolo S, Melone MAB. Understanding the Biological Activities of Vitamin D in Type 1 Neurofibromatosis: New Insights into Disease Pathogenesis and Therapeutic Design. Cancers (Basel) 2020; 12:E2965. [PMID: 33066259 PMCID: PMC7602022 DOI: 10.3390/cancers12102965] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/18/2020] [Accepted: 10/08/2020] [Indexed: 02/07/2023] Open
Abstract
Vitamin D is a fat-soluble steroid hormone playing a pivotal role in calcium and phosphate homeostasis as well as in bone health. Vitamin D levels are not exclusively dependent on food intake. Indeed, the endogenous production-occurring in the skin and dependent on sun exposure-contributes to the majority amount of vitamin D present in the body. Since vitamin D receptors (VDRs) are ubiquitous and drive the expression of hundreds of genes, the interest in vitamin D has tremendously grown and its role in different diseases has been extensively studied. Several investigations indicated that vitamin D action extends far beyond bone health and calcium metabolism, showing broad effects on a variety of critical illnesses, including cancer, infections, cardiovascular and autoimmune diseases. Epidemiological studies indicated that low circulating vitamin D levels inversely correlate with cutaneous manifestations and bone abnormalities, clinical hallmarks of neurofibromatosis type 1 (NF1). NF1 is an autosomal dominant tumour predisposition syndrome causing significant pain and morbidity, for which limited treatment options are available. In this context, vitamin D or its analogues have been used to treat both skin and bone lesions in NF1 patients, alone or combined with other therapeutic agents. Here we provide an overview of vitamin D, its characteristic nutritional properties relevant for health benefits and its role in NF1 disorder. We focus on preclinical and clinical studies that demonstrated the clinical correlation between vitamin D status and NF1 disease, thus providing important insights into disease pathogenesis and new opportunities for targeted therapy.
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Affiliation(s)
- Claudia Riccardi
- Department of Chemical Sciences, University of Naples Federico II, via Cintia 21, I-80126 Naples, Italy;
- Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, via Sergio Pansini 5, I-80131 Naples, Italy; (L.P.); (F.N.); (S.S.)
| | - Lorena Perrone
- Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, via Sergio Pansini 5, I-80131 Naples, Italy; (L.P.); (F.N.); (S.S.)
| | - Filomena Napolitano
- Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, via Sergio Pansini 5, I-80131 Naples, Italy; (L.P.); (F.N.); (S.S.)
| | - Simone Sampaolo
- Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, via Sergio Pansini 5, I-80131 Naples, Italy; (L.P.); (F.N.); (S.S.)
| | - Mariarosa Anna Beatrice Melone
- Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, via Sergio Pansini 5, I-80131 Naples, Italy; (L.P.); (F.N.); (S.S.)
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, Temple University, BioLife Building (015-00), 1900 North 12th Street, Philadelphia, PA 19122-6078, USA
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A Novel Signature Based on mTORC1 Pathway in Hepatocellular Carcinoma. JOURNAL OF ONCOLOGY 2020; 2020:8291036. [PMID: 33014055 PMCID: PMC7512110 DOI: 10.1155/2020/8291036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 08/15/2020] [Accepted: 09/01/2020] [Indexed: 12/11/2022]
Abstract
Background mTORC1 signal pathway plays a role in the initiation and progression of hepatocellular carcinoma (HCC), but no relevant gene signature was developed. This research aimed to explore the potential correlation between the mTORC1 signal pathway and HCC and establish the related gene signature. Methods HCC cases were retrieved from The Cancer Genome Atlas (TCGA), International Cancer Genome Consortium (ICGC), and Gene Expression Omnibus (GEO) databases. The genes included in mTORC1-associated signature were selected by performing univariate and multivariate Cox regression analyses and lasso regression analysis. The protein expression level of included genes was verified by The Human Protein Altas. Then, the signature was verified by survival analysis and multiple receiver operating characteristic (ROC) curve. Moreover, the correlation between signature and immune cells infiltration was investigated. Furthermore, a nomogram was established and evaluated by C-index and calibration plot. Results The signature was established with the six genes (ETF1, GSR, SKAP2, HSPD1, CACYBP, and PNP). Three genes (ETF1, GSR, and HSPD1) have verified their protein expression level in HCC. Under the grouping from signature, patients in the high-risk group showed worse survival than those in the low-risk group in both three datasets. The signature was found to be significantly associated with the infiltration of B cells, CD4+ T-cells, CD8+ T-cells, dendritic cells, macrophages, and neutrophils. The univariate and multivariate Cox regression analysis indicated that mTORC1-related signature could be the potential independent prognostic factor in HCC. Finally, the nomogram involving age, gender, stage, and signature has been established and verified. Conclusion The mTORC1-associated gene signature established and validated in our research could be used as a potential prognostic factor in HCC.
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Machado-Oliveira G, Ramos C, Marques ARA, Vieira OV. Cell Senescence, Multiple Organelle Dysfunction and Atherosclerosis. Cells 2020; 9:E2146. [PMID: 32977446 PMCID: PMC7598292 DOI: 10.3390/cells9102146] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/19/2020] [Accepted: 09/20/2020] [Indexed: 01/10/2023] Open
Abstract
Atherosclerosis is an age-related disorder associated with long-term exposure to cardiovascular risk factors. The asymptomatic progression of atherosclerotic plaques leads to major cardiovascular diseases (CVD), including acute myocardial infarctions or cerebral ischemic strokes in some cases. Senescence, a biological process associated with progressive structural and functional deterioration of cells, tissues and organs, is intricately linked to age-related diseases. Cell senescence involves coordinated modifications in cellular compartments and has been demonstrated to contribute to different stages of atheroma development. Senescence-based therapeutic strategies are currently being pursued to treat and prevent CVD in humans in the near-future. In addition, distinct experimental settings allowed researchers to unravel potential approaches to regulate anti-apoptotic pathways, facilitate excessive senescent cell clearance and eventually reverse atherogenesis to improve cardiovascular function. However, a deeper knowledge is required to fully understand cellular senescence, to clarify senescence and atherogenesis intertwining, allowing researchers to establish more effective treatments and to reduce the cardiovascular disorders' burden. Here, we present an objective review of the key senescence-related alterations of the major intracellular organelles and analyze the role of relevant cell types for senescence and atherogenesis. In this context, we provide an updated analysis of therapeutic approaches, including clinically relevant experiments using senolytic drugs to counteract atherosclerosis.
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Affiliation(s)
- Gisela Machado-Oliveira
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal; (C.R.); (A.R.A.M.)
| | | | | | - Otília V. Vieira
- CEDOC, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, 1169-056 Lisboa, Portugal; (C.R.); (A.R.A.M.)
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Nicholson K, MacLusky NJ, Leranth C. Synaptic effects of estrogen. VITAMINS AND HORMONES 2020; 114:167-210. [PMID: 32723543 DOI: 10.1016/bs.vh.2020.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The concept that estradiol may act as a local neuromodulator in the brain, rapidly affecting connectivity and synaptic function, has been firmly established by research over the last 30 years. De novo synthesis of estradiol within the brain as well as signaling mechanisms mediating responses to the hormone have been demonstrated, along with morphological evidence indicating rapid changes in synaptic input following increases in local estradiol levels. These rapid synaptic effects may play important roles in both physiological and pathophysiological responses to changes in circulating hormone levels, as well as in neurodegenerative disease. How local effects of estradiol on synaptic plasticity are integrated into changes in the overall activity of neural networks in the brain, however, remains a subject that is only incompletely understood.
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Affiliation(s)
- Kate Nicholson
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Neil J MacLusky
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Csaba Leranth
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University, School of Medicine, New Haven, CT, United States.
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Odachowski M, Marschner C, Blom B. A review on 1,1-bis(diphenylphosphino)methane bridged homo- and heterobimetallic complexes for anticancer applications: Synthesis, structure, and cytotoxicity. Eur J Med Chem 2020; 204:112613. [PMID: 32784095 DOI: 10.1016/j.ejmech.2020.112613] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/14/2020] [Accepted: 06/22/2020] [Indexed: 12/19/2022]
Abstract
Herein, we review developments in synthesis, structure, and biological (anti-cancer) activities of 1,1-bis(diphenylphosphino)methane (dppm) bridged homo- and heterobimetallic systems of the type LmM(μ2-dppm)M'Ln (M and M' are transition metals which may be different or the same and Ln,m are co-ligands) since the first such reported bimetallic system in 1987 until the present time (2020). As the simplest diphosphine, dppm enables facile formation of bimetallic complexes, where, given the short spacer between the PPh2 groups, close spatial proximity of the metal centres is ensured. We concentrate on complexes bearing no M-M interaction and contrast biological activities of these complexes with mononuclear counterparts and positive control agents such as cisplatin, in an attempt to elucidate patterns in the biological activities of these complexes.
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Affiliation(s)
- Matylda Odachowski
- Maastricht Science Programme, Faculty of Science and Engineering, Maastricht University, Kapoenstraat 2, PO Box 616, 6200, MD, Maastricht, the Netherlands
| | - Christoph Marschner
- Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 9, A-8010, Graz, Austria
| | - Burgert Blom
- Maastricht Science Programme, Faculty of Science and Engineering, Maastricht University, Kapoenstraat 2, PO Box 616, 6200, MD, Maastricht, the Netherlands.
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Host-Directed Therapies and Anti-Virulence Compounds to Address Anti-Microbial Resistant Tuberculosis Infection. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10082688] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Despite global efforts to contain tuberculosis (TB), the disease remains a leading cause of morbidity and mortality worldwide, further exacerbated by the increased resistance to antibiotics displayed by the tubercle bacillus Mycobacterium tuberculosis. In order to treat drug-resistant TB, alternative or complementary approaches to standard anti-TB regimens are being explored. An area of active research is represented by host-directed therapies which aim to modulate the host immune response by mitigating inflammation and by promoting the antimicrobial activity of immune cells. Additionally, compounds that reduce the virulence of M. tuberculosis, for instance by targeting the major virulence factor ESX-1, are being given increased attention by the TB research community. This review article summarizes the current state of the art in the development of these emerging therapies against TB.
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Park JH, Lee NK, Lim HJ, Ji ST, Kim YJ, Jang WB, Kim DY, Kang S, Yun J, Ha JS, Kim H, Lee D, Baek SH, Kwon SM. Pharmacological inhibition of mTOR attenuates replicative cell senescence and improves cellular function via regulating the STAT3-PIM1 axis in human cardiac progenitor cells. Exp Mol Med 2020; 52:615-628. [PMID: 32273566 PMCID: PMC7210934 DOI: 10.1038/s12276-020-0374-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 09/08/2019] [Accepted: 10/29/2019] [Indexed: 12/19/2022] Open
Abstract
The mammalian target of rapamycin (mTOR) signaling pathway efficiently regulates the energy state of cells and maintains tissue homeostasis. Dysregulation of the mTOR pathway has been implicated in several human diseases. Rapamycin is a specific inhibitor of mTOR and pharmacological inhibition of mTOR with rapamycin promote cardiac cell generation from the differentiation of mouse and human embryonic stem cells. These studies strongly implicate a role of sustained mTOR activity in the differentiating functions of embryonic stem cells; however, they do not directly address the required effect for sustained mTOR activity in human cardiac progenitor cells. In the present study, we evaluated the effect of mTOR inhibition by rapamycin on the cellular function of human cardiac progenitor cells and discovered that treatment with rapamycin markedly attenuated replicative cell senescence in human cardiac progenitor cells (hCPCs) and promoted their cellular functions. Furthermore, rapamycin not only inhibited mTOR signaling but also influenced signaling pathways, including STAT3 and PIM1, in hCPCs. Therefore, these data reveal a crucial function for rapamycin in senescent hCPCs and provide clinical strategies based on chronic mTOR activity.
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Affiliation(s)
- Ji Hye Park
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
- R&D Center for Advanced Pharmaceuticals & Evaluation, Korea Institute of Toxicology, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, South Korea
| | - Na Kyoung Lee
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Hye Ji Lim
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Seung Taek Ji
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Yeon-Ju Kim
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Woong Bi Jang
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Da Yeon Kim
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Songhwa Kang
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Jisoo Yun
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Jong Seong Ha
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
- Research Institute of Convergence Biomedical Science and Technology, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea
| | - Hyungtae Kim
- Department of Thoracic and Cardiovascular Surgery, Pusan National University Yangsan Hospital, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea
| | - Dongjun Lee
- Department of Convergence Medical Science, Pusan National University School of Medicine, Yangsan, 50612, Republic of Korea.
| | - Sang Hong Baek
- Laboratory of Cardiovascular Disease, Division of Cardiology, School of Medicine, The Catholic University of Korea, Seoul, 137-040, Republic of Korea.
| | - Sang-Mo Kwon
- Laboratory of Regenerative Medicine and Stem Cell Biology, Department of Physiology, Medical Research Institute, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea.
- Department of Thoracic and Cardiovascular Surgery, Pusan National University Yangsan Hospital, School of Medicine, Pusan National University, Yangsan, 50612, Republic of Korea.
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Mrowka P, Glodkowska-Mrowka E. PPARγ Agonists in Combination Cancer Therapies. Curr Cancer Drug Targets 2019; 20:197-215. [PMID: 31814555 DOI: 10.2174/1568009619666191209102015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/03/2019] [Accepted: 11/01/2019] [Indexed: 12/15/2022]
Abstract
Peroxisome proliferator-activated receptor-gamma (PPARγ) is a nuclear receptor acting as a transcription factor involved in the regulation of energy metabolism, cell cycle, cell differentiation, and apoptosis. These unique properties constitute a strong therapeutic potential that place PPARγ agonists as one of the most interesting and widely studied anticancer molecules. Although PPARγ agonists exert significant, antiproliferative and tumoricidal activity in vitro, their anticancer efficacy in animal models is ambiguous, and their effectiveness in clinical trials in monotherapy is unsatisfactory. However, due to pleiotropic effects of PPARγ activation in normal and tumor cells, PPARγ ligands interact with many antitumor treatment modalities and synergistically potentiate their effectiveness. The most spectacular example is a combination of PPARγ ligands with tyrosine kinase inhibitors (TKIs) in chronic myeloid leukemia (CML). In this setting, PPARγ activation sensitizes leukemic stem cells, resistant to any previous form of treatment, to targeted therapy. Thus, this combination is believed to be the first pharmacological therapy able to cure CML patients. Within the last decade, a significant body of data confirming the benefits of the addition of PPARγ ligands to various antitumor therapies, including chemotherapy, hormonotherapy, targeted therapy, and immunotherapy, has been published. Although the majority of these studies have been carried out in vitro or animal tumor models, a few successful attempts to introduce PPARγ ligands into anticancer therapy in humans have been recently made. In this review, we aim to summarize shines and shadows of targeting PPARγ in antitumor therapies.
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Affiliation(s)
- Piotr Mrowka
- Department of Biophysics and Human Physiology, Medical University of Warsaw, Warsaw, Poland
| | - Eliza Glodkowska-Mrowka
- Department of Laboratory Diagnostics and Clinical Immunology of Developmental Age, Medical University of Warsaw, Warsaw, Poland.,Department of Experimental Hematology, Institute of Hematology and Transfusion Medicine, Warsaw, Poland
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Ezquerro S, Rodríguez A, Portincasa P, Frühbeck G. Effects of Diets on Adipose Tissue. Curr Med Chem 2019; 26:3593-3612. [PMID: 28521681 DOI: 10.2174/0929867324666170518102340] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 03/16/2017] [Accepted: 03/16/2017] [Indexed: 12/15/2022]
Abstract
BACKGROUND Obesity is a major health problem that has become a global epidemic. Overweight and obesity are commonly associated with the development of several pathologies, such as insulin resistance, cardiovascular diseases, sleep apnea and several types of cancer, which can lead to further morbidity and mortality. An increased abdominal adiposity renders overweight and obese individuals more prone to metabolic and cardiovascular problems. OBJECTIVE This Review aims to describe the dietary strategies to deal with excess adiposity given the medical, social and economic consequences of obesity. METHODS One hundred and eighty-five papers were included in the present Review. RESULTS Excess adiposity leads to several changes in the biology, morphology and function of the adipose tissue, such as adipocyte hypertrophy and hyperplasia, adipose tissue inflammation and fibrosis and an impaired secretion of adipokines, contributing to the onset of obesity- related comorbidities. The first approach for obesity management and prevention is the implementation of a diet combined with physical activity. The present review summarizes the compelling evidence showing body composition changes, impact on cardiometabolism and potential adverse effects of very-low calorie, low- and high-carbohydrate, high-protein or low-fat diets. The use of macronutrients during the preprandial and postprandial state has been also reviewed to better understand the metabolic changes induced by different dietary interventions. CONCLUSION Dietary changes should be individualised, tailored to food preferences and allow for flexible approaches to reducing calorie intake in order to increase the motivation and compliance of overweight and obese patients.
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Affiliation(s)
- Silvia Ezquerro
- Metabolic Research Laboratory, Clínica Universidad de Navarra, IdiSNA, Pamplona, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Amaia Rodríguez
- Metabolic Research Laboratory, Clínica Universidad de Navarra, IdiSNA, Pamplona, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Piero Portincasa
- Clinica Medica "A. Murri", Department of Biomedical Sciences and Human Oncology University of Bari Medical School, Policlinico Hospital, Bari, Italy
| | - Gema Frühbeck
- Metabolic Research Laboratory, Clínica Universidad de Navarra, IdiSNA, Pamplona, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain.,Department of Endocrinology & Nutrition, Clínica Universidad de Navarra, Pamplona, Spain
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Yu H, Liang H, Ren M, Ji K, Yang Q, Ge X, Xi B, Pan L. Effects of dietary fenugreek seed extracts on growth performance, plasma biochemical parameters, lipid metabolism, Nrf2 antioxidant capacity and immune response of juvenile blunt snout bream (Megalobrama amblycephala). FISH & SHELLFISH IMMUNOLOGY 2019; 94:211-219. [PMID: 31499200 DOI: 10.1016/j.fsi.2019.09.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/01/2019] [Accepted: 09/05/2019] [Indexed: 06/10/2023]
Abstract
Dietary administration of some plant-derived substances have been proved of great economic value in aquaculture. In order to investigate the effects of dietary fenugreek seed extracts (FSE) on juvenile blunt snout bream (Megalobrama amblycephala), a feeding trial was conducted for 8 weeks. The results showed that final weight (FW), weight gain (WG), feed conversion ratio (FCR) and specific growth rate (SGR) were not significantly affected by dietary FSE levels. The whole body lipid contents of fish fed with 0.04%, 0.08% and 0.16% FSE diets were significantly lowered compared to the control group. Dietary FSE diets significantly affected plasma complement component 3 (C3), immunoglobulin M (IgM), albumin (ALB) and total protein (TP). The relative expressions of acetyl CoA carboxylase (ACC), fatty acid synthase (FAS) and sterol regulatory element binding protein-1 (SREBP1) mRNA in the liver of fish decreased significantly with increasing dietary FSE levels from 0% up to 0.04%. FSE supplementation diets lowered the liver pro-inflammatory genes expressions by regulating tumor necrosis factor-α (TNF-α) and interleukin 8 (IL-8) mRNA levels and increased anti-inflammatory genes expression by regulating transforming growth factor (TGF-β) and interleukin 10 (IL-10). FSE diets increased growth factor-1 (IGF-1) and target of rapamycin (TOR) mRNA levels from 0% up to 0.04%, 0.04% FSE diets significantly increased growth factor-1 (IGF-1) mRNA levels and S6 kinase-polypeptide 1 (S6K1) mRNA levels compared to the control group. 0.04% FSE diets significantly increased superoxide dismutase (SOD) activities and 0.08% FSE diets significantly increased catalase (CAT) and glutathione peroxidase (GPx) activities, 0.16% FSE diets significantly increased total antioxidant capacity (T-AOC) activities compared to the control group. Additionally, compared to the control group, 0.04% dietary FSE significantly up-regulated nuclear factor erythroid 2-related factor 2 (Nrf2) mRNA levels and glutathione peroxidase-1 (GPx1) mRNA levels, at the same time, 0.02%, 0.04%, 0.08%, 0.16% FSE diets significantly down-regulated kelch-like ECH-associated protein 1 (Keap1) mRNA levels. However, no significant effects were observed on copper zinc superoxide dismutase (Cu/Zn-SOD) and manganese superoxide dismutase (Mn-SOD). Our study indicated that dietary FSE could improve plasma biochemical parameters, regulate lipid metabolism related genes, promote Nrf2 antioxidant capacity and enhance immune response of juvenile blunt snout bream.
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Affiliation(s)
- Heng Yu
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China
| | - Hualiang Liang
- Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | - Mingchun Ren
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China; Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China.
| | - Ke Ji
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China
| | - Qiang Yang
- Jiangsu Tianshen Co., Ltd, Huai'an, 223003, China
| | - Xianping Ge
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China; Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | - Bingwen Xi
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China; Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | - Liangkun Pan
- Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Freshwater Fisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
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Kamboj K, Jana S, Sharma SK. Mechanisms of protein kinase C-induced sustained activation of extracellular signal-regulated kinase in the hippocampus. Biochem Biophys Res Commun 2019; 520:453-458. [PMID: 31607483 DOI: 10.1016/j.bbrc.2019.10.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 10/03/2019] [Indexed: 10/25/2022]
Abstract
Protein Kinase C (PKC) and extracellular signal-regulated kinase (ERK) regulate synaptic plasticity and memory. PKC activation enhances long-term potentiation (LTP) in the hippocampal slices. In addition, activation of PKC by phorbol 12,13-diacetate (PDA) induces ERK activation. However, the mechanisms involved in PDA-induced activation of ERK are not well understood. Using hippocampal slices, we report that PDA induces a sustained activation of ERK. PDA-induced sustained ERK activation critically requires protein synthesis as well as transcription, the cellular processes that play crucial roles in long-lasting LTP and memory. In addition, the mammalian target of rapamycin activity is required for PDA-induced sustained ERK activation. Further, we show that growth factor signalling plays a critical role in PDA-induced sustained ERK activation. These results suggest that sustained ERK activation may have an important role in LTP.
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Affiliation(s)
- Kautuk Kamboj
- National Brain Research Centre, Manesar, 122052, Haryana, India
| | - Subhajit Jana
- National Brain Research Centre, Manesar, 122052, Haryana, India
| | - Shiv K Sharma
- National Brain Research Centre, Manesar, 122052, Haryana, India.
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48
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Huang L, Yue J. The interplay of autophagy and enterovirus. Semin Cell Dev Biol 2019; 101:12-19. [PMID: 31563390 PMCID: PMC7102577 DOI: 10.1016/j.semcdb.2019.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 08/02/2019] [Accepted: 08/02/2019] [Indexed: 12/19/2022]
Abstract
Autophagy, an evolutional conserved lysosomal degradation process, has been implicated to play an important role in cellular defense against a variety of microbial infection. Interestingly, numerous studies found that some pathogens, especially positive-single-strand RNA viruses, actually hijacked autophagy machinery to promote virus infection within host cells, facilitating different stages of viral life cycle, from replication, assembly to egress. Enterovirus, a genus of positive-strand RNA virus, can cause various human diseases and is one of main public health threat globally, yet no effective clinical intervention is available for enterovirus infection. Here we summarized recent literature on how enteroviruses regulate and utilize autophagy process to facilitate their propagation in the host cells. The studies on the interplay between enterovirus and autophagy not only shed light on the molecular mechanisms underlying how enterovirus hijacks cellular components and pathway for its own benefits, but also provide therapeutic option against enterovirus infection.
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Affiliation(s)
- Lihong Huang
- City University of Hong Kong ShenZhen Research Institute, ShenZhen, China
| | - Jianbo Yue
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.
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49
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So YS, Lee DG, Idnurm A, Ianiri G, Bahn YS. The TOR Pathway Plays Pleiotropic Roles in Growth and Stress Responses of the Fungal Pathogen Cryptococcus neoformans. Genetics 2019; 212:1241-1258. [PMID: 31175227 PMCID: PMC6707454 DOI: 10.1534/genetics.119.302191] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 06/02/2019] [Indexed: 11/18/2022] Open
Abstract
The target of rapamycin (TOR) pathway is an evolutionarily conserved signal transduction system that governs a plethora of eukaryotic biological processes, but its role in Cryptococcus neoformans remains elusive. In this study, we investigated the TOR pathway by functionally characterizing two Tor-like kinases, Tor1 and Tlk1, in C. neoformans We successfully deleted TLK1, but not TOR1TLK1 deletion did not result in any evident in vitro phenotypes, suggesting that Tlk1 is dispensable for the growth of C. neoformans We demonstrated that Tor1, but not Tlk1, is essential and the target of rapamycin by constructing and analyzing conditionally regulated strains and sporulation analysis of heterozygous mutants in the diploid strain background. To further analyze the Tor1 function, we constructed constitutive TOR1 overexpression strains. Tor1 negatively regulated thermotolerance and the DNA damage response, which are two important virulence factors of C. neoformansTOR1 overexpression reduced Mpk1 phosphorylation, which is required for cell wall integrity and thermoresistance, and Rad53 phosphorylation, which governs the DNA damage response pathway. Tor1 is localized to the cytoplasm, but enriched in the vacuole membrane. Phosphoproteomics and transcriptomics revealed that Tor1 regulates a variety of biological processes, including metabolic processes, cytoskeleton organization, ribosome biogenesis, and stress response. TOR inhibition by rapamycin caused actin depolarization in a Tor1-dependent manner. Finally, screening rapamycin-sensitive and -resistant kinase and transcription factor mutants revealed that the TOR pathway may crosstalk with a number of stress signaling pathways. In conclusion, our study demonstrates that a single Tor1 kinase plays pleiotropic roles in C. neoformans.
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Affiliation(s)
- Yee-Seul So
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Dong-Gi Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Alexander Idnurm
- School of BioSciences, The University of Melbourne, Victoria 3010, Australia
| | - Giuseppe Ianiri
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Yong-Sun Bahn
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
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50
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Aryanpur PP, Renner DM, Rodela E, Mittelmeier TM, Byrd A, Bolger TA. The DEAD-box RNA helicase Ded1 has a role in the translational response to TORC1 inhibition. Mol Biol Cell 2019; 30:2171-2184. [PMID: 31141444 PMCID: PMC6743465 DOI: 10.1091/mbc.e18-11-0702] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Ded1 is a DEAD-box RNA helicase with essential roles in translation initiation. It binds to the eukaryotic initiation factor 4F (eIF4F) complex and promotes 48S preinitiation complex assembly and start-site scanning of 5′ untranslated regions of mRNAs. Most prior studies of Ded1 cellular function were conducted in steady-state conditions during nutrient-rich growth. In this work, however, we examine its role in the translational response during target of rapamycin (TOR)C1 inhibition and identify a novel function of Ded1 as a translation repressor. We show that C-terminal mutants of DED1 are defective in down-regulating translation following TORC1 inhibition using rapamycin. Furthermore, following TORC1 inhibition, eIF4G1 normally dissociates from translation complexes and is degraded, and this process is attenuated in mutant cells. Mapping of the functional requirements for Ded1 in this translational response indicates that Ded1 enzymatic activity and interaction with eIF4G1 are required, while homo-oligomerization may be dispensable. Our results are consistent with a model wherein Ded1 stalls translation and specifically removes eIF4G1 from translation preinitiation complexes, thus removing eIF4G1 from the translating mRNA pool and leading to the codegradation of both proteins. Shared features among DED1 orthologues suggest that this role is conserved and may be implicated in pathologies such as oncogenesis.
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Affiliation(s)
- Peyman P Aryanpur
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
| | - David M Renner
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
| | - Emily Rodela
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
| | - Telsa M Mittelmeier
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
| | - Aaron Byrd
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
| | - Timothy A Bolger
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Tucson, AZ 85721
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