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Kimura T, Kimura AK, Epand RM. Systematic crosstalk in plasmalogen and diacyl lipid biosynthesis for their differential yet concerted molecular functions in the cell. Prog Lipid Res 2023; 91:101234. [PMID: 37169310 DOI: 10.1016/j.plipres.2023.101234] [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: 03/03/2023] [Revised: 04/29/2023] [Accepted: 05/05/2023] [Indexed: 05/13/2023]
Abstract
Plasmalogen is a major phospholipid of mammalian cell membranes. Recently it is becoming evident that the sn-1 vinyl-ether linkage in plasmalogen, contrasting to the ester linkage in the counterpart diacyl glycerophospholipid, yields differential molecular characteristics for these lipids especially related to hydrocarbon-chain order, so as to concertedly regulate biological membrane processes. A role played by NMR in gaining information in this respect, ranging from molecular to tissue levels, draws particular attention. We note here that a broad range of enzymes in de novo synthesis pathway of plasmalogen commonly constitute that of diacyl glycerophospholipid. This fact forms the basis for systematic crosstalk that not only controls a quantitative balance between these lipids, but also senses a defect causing loss of lipid in either pathway for compensation by increase of the counterpart lipid. However, this inherent counterbalancing mechanism paradoxically amplifies imbalance in differential effects of these lipids in a diseased state on membrane processes. While sharing of enzymes has been recognized, it is now possible to overview the crosstalk with growing information for specific enzymes involved. The overview provides a fundamental clue to consider cell and tissue type-dependent schemes in regulating membrane processes by plasmalogen and diacyl glycerophospholipid in health and disease.
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Affiliation(s)
- Tomohiro Kimura
- Department of Chemistry & Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, Kansas 66506, USA.
| | - Atsuko K Kimura
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - Richard M Epand
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
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2
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Lin H, Guo X, Yang F, Yu L, Wen R, Zhang X. MiR-598-5p inhibits breast cancer tumor growth and lung metastasis by targeting PPAPDC1A. CHINESE J PHYSIOL 2023; 66:103-110. [PMID: 37026213 DOI: 10.4103/cjop.cjop-d-22-00089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
Abstract
This study aimed to explore the effects of PPAPDC1A on the malignant phenotype of breast cancer (BC) in vivo and in vitro. PPAPDC1A expression was examined in BC tissues and cell lines by real-time polymerase chain reaction and Western blot. In this article, cell proliferation was evaluated by Cell Counting Kit-8 assay and colony formation assay, and cell migration and invasion were evaluated by wound healing assay and transwell assays. Furthermore, in vivo cell growth and pulmonary metastasis experiments were also performed using nude mice. The results showed that compared with normal tissues and cells, the PPAPDC1A expression in BC tissues and cell lines were both significantly increased. The PPAPDC1A targeting sequence significantly inhibited the PPAPDC1A expression and cell proliferation, migration, and invasion. The results of xenograft showed that knockdown of PPAPDC1A inhibited tumor growth and lung metastasis of BC. Then, the Dual-Luciferase Reporter Assay confirmed that miR-598-5p targeted the regulation of PPAPDC1A expression. In addition, the miR-598-5p expression in BC tissues was lower than that in the normal tissues. The rescue experiment showed that PPAPDC1A overexpression reversed the inhibitory effect of miR-598-5p mimic on cell proliferation, migration, and invasion. In conclusion, PPAPDC1A was highly expressed in BC tissues and cell lines, and miR-598-5p inhibited the malignant phenotype of BC by targeting PPAPDC1A.
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3
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Gao N, Zheng Q, Wang Y, Li X, Li Z, Xiao H. Wun2-mediated integrin recycling promotes apoptotic cell clearance in Drosophila melanogaster. Cell Death Differ 2022; 29:2545-2561. [PMID: 35840760 PMCID: PMC9751302 DOI: 10.1038/s41418-022-01039-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 06/25/2022] [Accepted: 07/04/2022] [Indexed: 01/31/2023] Open
Abstract
Apoptotic cell (AC) clearance is a complex process in which phagocytes recognize, engulf, and digest ACs during organismal development and tissue homeostasis. Impaired efferocytosis results in developmental defects and autoimmune diseases. In the current study, we performed RNA-sequencing to systematically identify regulators involved in the phagocytosis of ACs by Drosophila melanogaster macrophage-like S2 cells, followed by targeted RNA interference screening. Wunen2 (Wun2), a homolog of mammalian lipid phosphate phosphatase (LPP), was deemed as required for efferocytosis both in vitro and in vivo. However, efferocytosis was independent of Wun2 phosphatase activity. Proteomic analysis further revealed that Rab11 and its effector Rip11 are interaction partners of Wun2. Therefore, Wun2 collaborates with Rip11 and Rab11 to mediate efficient recycling of the phagocytic receptor βν integrin subunit to the plasma membrane. The loss of Wun2 results in the routing of βv integrin subunit (Itgbn) into lysosomes, leading to its degradation. The deficiency of βv integrin subunit on the cell surface leads to aberrant and disorganized actin cytoskeleton, thereby influencing the formation of macrophage pseudopodia toward ACs and thus failure to engulf them. The findings of this study provide insights that clarify how phagocytes coordinate AC signals and adopt a precise mechanism for the maintenance of engulfment receptors at their cell membrane surface to regulate efferocytosis.
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Affiliation(s)
- Ning Gao
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
- Medical College of Yan'an University, Yan'an, Shaanxi, 716000, China
| | - Qian Zheng
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Yanzhe Wang
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Xiaowen Li
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Zhi Li
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China
| | - Hui Xiao
- College of Life Sciences, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
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Kakehi S, Tamura Y, Ikeda SI, Kaga N, Taka H, Ueno N, Shiuchi T, Kubota A, Sakuraba K, Kawamori R, Watada H. Short-term physical inactivity induces diacylglycerol accumulation and insulin resistance in muscle via lipin1 activation. Am J Physiol Endocrinol Metab 2021; 321:E766-E781. [PMID: 34719943 DOI: 10.1152/ajpendo.00254.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Physical inactivity impairs muscle insulin sensitivity. However, its mechanism is unclear. To model physical inactivity, we applied 24-h hind-limb cast immobilization (HCI) to mice with normal or high-fat diet (HFD) and evaluated intramyocellular lipids and the insulin signaling pathway in the soleus muscle. Although 2-wk HFD alone did not alter intramyocellular diacylglycerol (IMDG) accumulation, HCI alone increased it by 1.9-fold and HCI after HFD further increased it by 3.3-fold. Parallel to this, we found increased protein kinase C ε (PKCε) activity, reduced insulin-induced 2-deoxyglucose (2-DOG) uptake, and reduced phosphorylation of insulin receptor β (IRβ) and Akt, key molecules for insulin signaling pathway. Lipin1, which converts phosphatidic acid to diacylglycerol, showed increase of its activity by HCI, and dominant-negative lipin1 expression in muscle prevented HCI-induced IMDG accumulation and impaired insulin-induced 2-DOG uptake. Furthermore, 24-h leg cast immobilization in human increased lipin1 expression. Thus, even short-term immobilization increases IMDG and impairs insulin sensitivity in muscle via enhanced lipin1 activity.NEW & NOTEWORTHY Physical inactivity impairs muscle insulin sensitivity. However, its mechanism is unclear. To model physical inactivity, we applied 24-h hind-limb cast immobilization to mice with normal or high-fat diet and evaluated intramyocellular lipids and the insulin signaling pathway in the soleus muscle. We found that even short-term immobilization increases intramyocellular diacylglycerol and impairs insulin sensitivity in muscle via enhanced lipin1 activity.
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Affiliation(s)
- Saori Kakehi
- Department of Metabolism and Endocrinology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Sportology Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Yoshifumi Tamura
- Department of Metabolism and Endocrinology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Sportology Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Shin-Ichi Ikeda
- Department of Metabolism and Endocrinology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Sportology Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Naoko Kaga
- Laboratory of Proteomics and Biomolecular Science, Biomedical Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Hikari Taka
- Laboratory of Proteomics and Biomolecular Science, Biomedical Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Noriko Ueno
- Laboratory of Proteomics and Biomolecular Science, Biomedical Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Tetsuya Shiuchi
- Department of Integrative Physiology, Institute for Health Biosciences, University of Tokushima Graduate School, Tokushima, Japan
| | - Atsushi Kubota
- Department of Sports Medicine, Juntendo University, Chiba, Japan
| | | | - Ryuzo Kawamori
- Department of Metabolism and Endocrinology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Sportology Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Hirotaka Watada
- Department of Metabolism and Endocrinology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Sportology Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Center for Therapeutic Innovations in Diabetes, Graduate School of Medicine, Juntendo University, Tokyo, Japan
- Center for Identification of Diabetic Therapeutic Targets, Graduate School of Medicine, Juntendo University, Tokyo, Japan
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Tang X, Brindley DN. Lipid Phosphate Phosphatases and Cancer. Biomolecules 2020; 10:biom10091263. [PMID: 32887262 PMCID: PMC7564803 DOI: 10.3390/biom10091263] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 08/28/2020] [Accepted: 08/30/2020] [Indexed: 12/22/2022] Open
Abstract
Lipid phosphate phosphatases (LPPs) are a group of three enzymes (LPP1–3) that belong to a phospholipid phosphatase (PLPP) family. The LPPs dephosphorylate a wide spectrum of bioactive lipid phosphates, among which lysophosphatidate (LPA) and sphingosine 1-phosphate (S1P) are two important extracellular signaling molecules. The LPPs are integral membrane proteins, which are localized on plasma membranes and intracellular membranes, including the endoplasmic reticulum and Golgi network. LPPs regulate signaling transduction in cancer cells and demonstrate different effects in cancer progression through the breakdown of extracellular LPA and S1P and other intracellular substrates. This review is intended to summarize an up-to-date understanding about the functions of LPPs in cancers.
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Affiliation(s)
- Xiaoyun Tang
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2S2, Canada;
- Cancer Research Institute of Northern Alberta, University of Alberta, Edmonton, AB T6G 2E1, Canada
| | - David N. Brindley
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2S2, Canada;
- Cancer Research Institute of Northern Alberta, University of Alberta, Edmonton, AB T6G 2E1, Canada
- Correspondence:
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RhoGAP domain-containing fusions and PPAPDC1A fusions are recurrent and prognostic in diffuse gastric cancer. Nat Commun 2018; 9:4439. [PMID: 30361512 PMCID: PMC6202325 DOI: 10.1038/s41467-018-06747-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 09/21/2018] [Indexed: 01/22/2023] Open
Abstract
We conducted an RNA sequencing study to identify novel gene fusions in 80 discovery dataset tumors collected from young patients with diffuse gastric cancer (DGC). Twenty-five in-frame fusions are associated with DGC, three of which (CLDN18-ARHGAP26, CTNND1-ARHGAP26, and ANXA2-MYO9A) are recurrent in 384 DGCs based on RT-PCR. All three fusions contain a RhoGAP domain in their 3’ partner genes. Patients with one of these three fusions have a significantly worse prognosis than those without. Ectopic expression of CLDN18-ARHGAP26 promotes the migration and invasion capacities of DGC cells. Parallel targeted RNA sequencing analysis additionally identifies TACC2-PPAPDC1A as a recurrent and poor prognostic in-frame fusion. Overall, PPAPDC1A fusions and in-frame fusions containing a RhoGAP domain clearly define the aggressive subset (7.5%) of DGCs, and their prognostic impact is greater than, and independent of, chromosomal instability and CDH1 mutations. Our study may provide novel genomic insights guiding future strategies for managing DGCs. Diffuse Gastric Cancer (DGC) is increasingly being considered separate to intestinal type gastric cancer; several fusions events have been reported as drivers of the disease but few of those have been subsequently validated. Here the authors perform RNA-seq on early-onset DGC patients who had not been treated with chemotherapy or radiation and identify a previously unknown fusion.
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7
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Mining the Plasma Cell Transcriptome for Novel Cell Surface Proteins. Int J Mol Sci 2018; 19:ijms19082161. [PMID: 30042348 PMCID: PMC6121261 DOI: 10.3390/ijms19082161] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 07/20/2018] [Accepted: 07/20/2018] [Indexed: 12/31/2022] Open
Abstract
Antibody Secreting Cells (ASCs) are a fundamental component of humoral immunity, however, deregulated or excessive antibody production contributes to the pathology of autoimmune diseases, while transformation of ASCs results in the malignancy Multiple Myeloma (MM). Despite substantial recent improvements in treating these conditions, there is as yet no widely used ASC-specific therapeutic approach, highlighting a critical need to identify novel methods of targeting normal and malignant ASCs. Surface molecules specifically expressed by the target cell population represent ideal candidates for a monoclonal antibody-based therapy. By interrogating the ASC gene signature that we previously defined we identified three surface proteins, Plpp5, Clptm1l and Itm2c, which represent potential targets for novel MM treatments. Plpp5, Clptm1l and Itm2c are highly and selectively expressed by mouse and human ASCs as well as MM cells. To investigate the function of these proteins within the humoral immune system we have generated three novel mouse strains, each carrying a loss-of-function mutation in either Plpp5, Clptm1l or Itm2c. Through analysis of these novel strains, we have shown that Plpp5, Clptm1l and Itm2c are dispensable for the development, maturation and differentiation of B-lymphocytes, and for the production of antibodies by ASCs. As adult mice lacking either protein showed no apparent disease phenotypes, it is likely that targeting these molecules on ASCs will have minimal on-target adverse effects.
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8
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Zhang X, Zhang L, Lin B, Chai X, Li R, Liao Y, Deng X, Liu Q, Yang W, Cai Y, Zhou W, Lin Z, Huang W, Zhong M, Lei F, Wu J, Yu S, Li X, Li S, Li Y, Zeng J, Long W, Ren D, Huang Y. Phospholipid Phosphatase 4 promotes proliferation and tumorigenesis, and activates Ca 2+-permeable Cationic Channel in lung carcinoma cells. Mol Cancer 2017; 16:147. [PMID: 28851360 PMCID: PMC5576330 DOI: 10.1186/s12943-017-0717-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 08/23/2017] [Indexed: 12/23/2022] Open
Abstract
Background Phospholipid phosphatase 4 (PPAPDC1A or PLPP4) has been demonstrated to be involved in the malignant process of many cancers. The purpose of this study was to investigate the clinical significance and biological roles of PLPP4 in lung carcinoma. Methods PLPP4 expression was examined in 8 paired lung carcinoma tissues by real-time PCR and in 265 lung carcinoma tissues by immunohistochemistry (IHC). Statistical analysis was performed to evaluate the clinical correlation between PLPP4 expression and clinicopathological features and survival in lung carcinoma patients. In vitro and in vivo assays were performed to assess the biological roles of PLPP4 in lung carcinoma. Fluorescence-activated cell sorting, Western blotting and luciferase assays were used to identify the underlying pathway through which PLPP4 silencing mediates biological roles in lung carcinoma. Results PLPP4 is differentially elevated in lung adenocarcinoma (ADC) and lung squamous cell carcinoma (SQC) tissues. Statistical analysis demonstrated that high expression of PLPP4 significantly and positively correlated with clinicopathological features, including pathological grade, T category and stage, and poor overall and progression-free survival in lung carcinoma patients. Silencing PLPP4 inhibits proliferation and cell cycle progression in vitro and tumorigenesis in vivo in lung carcinoma cells. Our results further reveal that PLPP4 silencing inhibits Ca2+-permeable cationic channel, suggesting that downregulation of PLPP4 inhibits proliferation and tumorigenesis in lung carcinoma cells via reducing the influx of intracellular Ca2+. Conclusion Our results indicate that PLPP4 may hold promise as a novel marker for the diagnosis of lung carcinoma and as a potential therapeutic target to facilitate the development of novel treatment for lung carcinoma. Electronic supplementary material The online version of this article (10.1186/s12943-017-0717-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xin Zhang
- Clinical Experimental Center, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China.,Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China.,Dongguan Key Laboratory of Medical Bioactive Molecular Developmental and Translational Research, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523808, China
| | - Lan Zhang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Department of Obstetrics and Gynecology, Sun Yat-Sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, China
| | - Bihua Lin
- Dongguan Key Laboratory of Medical Bioactive Molecular Developmental and Translational Research, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523808, China
| | - Xingxing Chai
- Laboratory Animal Center, Guangdong Medical University, Zhanjiang, 524023, China
| | - Ronggang Li
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Yuehua Liao
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Xinghui Deng
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Qiongru Liu
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Wenli Yang
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Yubo Cai
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Wei Zhou
- Department of Pathology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Zhichao Lin
- Department of Thoracic Surgery, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Wenhai Huang
- Department of Thoracic Surgery, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Meigong Zhong
- Department of Pharmacy, Jiangmen Maternity and Child Health Care Hospital, Jiangmen, 529030, China
| | - Fangyong Lei
- Department of Oncology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Jinhua Wu
- Department of Clinical Laboratory, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Shuaishuai Yu
- Department of Clinical Laboratory, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Xiaoping Li
- Department of General Surgery, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Shangren Li
- Department of General Surgery, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Yueyue Li
- Department of Radiology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Jincheng Zeng
- Dongguan Key Laboratory of Medical Bioactive Molecular Developmental and Translational Research, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523808, China
| | - Wansheng Long
- Department of Radiology, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China
| | - Dong Ren
- Dongguan Key Laboratory of Medical Bioactive Molecular Developmental and Translational Research, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523808, China. .,Department of Orthopaedic Surgery, The First Affiliated Hospital of Sun Yat-sen University, 58# Zhongshan 2rd Road, Guangzhou, Guangdong Province, 510080, China.
| | - Yanming Huang
- Clinical Experimental Center, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China. .,Department of Respiration Medicine, Jiangmen Central Hospital, Affiliated Jiangmen Hospital of Sun Yat-sen University, Jiangmen, 529030, China.
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Multiple across-strain and within-strain QTLs suggest highly complex genetic architecture for hypoxia tolerance in channel catfish. Mol Genet Genomics 2016; 292:63-76. [PMID: 27734158 DOI: 10.1007/s00438-016-1256-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 10/03/2016] [Indexed: 10/20/2022]
Abstract
The ability to survive hypoxic conditions is important for various organisms, especially for aquatic animals. Teleost fish, representing more than 50 % of vertebrate species, are extremely efficient in utilizing low levels of dissolved oxygen in water. However, huge variations exist among various taxa of fish in their ability to tolerate hypoxia. In aquaculture, hypoxia tolerance is among the most important traits because hypoxia can cause major economic losses. Genetic enhancement for hypoxia tolerance in catfish is of great interest, but little was done with analysis of the genetic architecture of hypoxia tolerance. The objective of this study was to conduct a genome-wide association study to identify QTLs for hypoxia tolerance using the catfish 250K SNP array with channel catfish families from six strains. Multiple significant and suggestive QTLs were identified across and within strains. One significant QTL and four suggestive QTLs were identified across strains. Six significant QTLs and many suggestive QTLs were identified within strains. There were rare overlaps among the QTLs identified within the six strains, suggesting a complex genetic architecture of hypoxia tolerance. Overall, within-strain QTLs explained larger proportion of phenotypic variation than across-strain QTLs. Many of genes within these identified QTLs have known functions for regulation of oxygen metabolism and involvement in hypoxia responses. Pathway analysis indicated that most of these genes were involved in MAPK or PI3K/AKT/mTOR signaling pathways that were known to be important for hypoxia-mediated angiogenesis, cell proliferation, apoptosis and survival.
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10
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Subramanian T, Ren H, Subramanian KL, Sunkara M, Onono FO, Morris AJ, Spielmann HP. Design and synthesis of non-hydrolyzable homoisoprenoid α-monofluorophosphonate inhibitors of PPAPDC family integral membrane lipid phosphatases. Bioorg Med Chem Lett 2014; 24:4414-4417. [PMID: 25150376 DOI: 10.1016/j.bmcl.2014.08.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 08/01/2014] [Accepted: 08/05/2014] [Indexed: 12/20/2022]
Abstract
An efficient, diversity oriented synthesis of homoisoprenoid α-monofluorophosphonates utilizing electrophilic fluorination is presented along with their activity as inhibitors of PPAPDC2 family integral membrane lipid phosphatases. These novel phosphatase-resistant analogues of isoprenoid monophosphates are a platform for further structure-activity relationship studies and provide access to other isoprenoid family members where the phosphate ester oxygen is replaced by a α-monofluoromethylene moiety.
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Affiliation(s)
- Thangaiah Subramanian
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA
| | - Hongmei Ren
- Division of Cardiovascular Medicine UK COM, University of Kentucky, Lexington, KY 40536, USA
| | | | - Manjula Sunkara
- Division of Cardiovascular Medicine UK COM, University of Kentucky, Lexington, KY 40536, USA
| | - Fredrick O Onono
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA
| | - Andrew J Morris
- Division of Cardiovascular Medicine UK COM, University of Kentucky, Lexington, KY 40536, USA; Lexington Veterans Affairs Medical Center, University of Kentucky, Lexington, KY 40536, USA
| | - H Peter Spielmann
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA; Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA; Kentucky Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA; Department of Chemistry, University of Kentucky, Lexington, KY 40536, USA.
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11
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Mahmood SF, Gruel N, Nicolle R, Chapeaublanc E, Delattre O, Radvanyi F, Bernard-Pierrot I. PPAPDC1B and WHSC1L1 are common drivers of the 8p11-12 amplicon, not only in breast tumors but also in pancreatic adenocarcinomas and lung tumors. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:1634-1644. [PMID: 24051013 DOI: 10.1016/j.ajpath.2013.07.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 06/28/2013] [Accepted: 07/09/2013] [Indexed: 01/13/2023]
Abstract
Amplification of the 8p11-12 chromosomal region is a common genetic event in many epithelial cancers. In breast cancer, several genes within this region have been shown to display oncogenic activity. Among these genes, the enzyme-encoding genes, PPAPDC1B and WHSC1L1, have been identified as potential therapeutic targets. We investigated whether PPAPDC1B and WHSC1L1 acted as general driver genes, thereby serving as therapeutic targets in other tumors with 8p11-12 amplification. By using publicly available genomic data from a panel of 883 cell lines derived from different cancers, we identified the cell lines presenting amplification of both WHSC1L1 and PPAPDC1B. In particular, we focused on cell lines derived from lung cancer and pancreatic adenocarcinoma and found a correlation between the amplification of PPAPDC1B and WHSC1L1 with their overexpression. Loss-of-function studies based on the use of siRNA and shRNA demonstrated that PPAPDC1B and WHSC1L1 played a major role in regulating the survival of pancreatic adenocarcinoma and small-cell lung cancer-derived cell lines, both in anchorage-dependent and anchorage-independent conditions, displaying amplification and overexpression of these genes. We also demonstrated that PPAPDC1B and WHSC1L1 regulated xenograft growth in these cell lines. Finally, quantitative RT-PCR experiments after PPAPDC1B and WHSC1L1 knockdown revealed exclusive PPAPDC1B and WHSC1L1 gene targets in small-cell lung cancer and pancreatic adenocarcinoma-derived cell lines compared with breast cancer.
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MESH Headings
- Adenocarcinoma/genetics
- Adenocarcinoma/pathology
- Animals
- Breast Neoplasms/genetics
- Breast Neoplasms/pathology
- Carcinoma, Pancreatic Ductal/genetics
- Carcinoma, Pancreatic Ductal/pathology
- Cell Line, Tumor
- Cell Proliferation
- Cell Survival/genetics
- Chromosomes, Human, Pair 8/genetics
- Female
- Gene Amplification
- Gene Expression Regulation, Neoplastic
- Gene Knockdown Techniques
- Histone-Lysine N-Methyltransferase/genetics
- Humans
- Lung Neoplasms/genetics
- Lung Neoplasms/pathology
- Mice
- Mice, Nude
- Nuclear Proteins/genetics
- Pancreatic Neoplasms/genetics
- Pancreatic Neoplasms/pathology
- Phosphatidate Phosphatase/genetics
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- RNA, Small Interfering/metabolism
- Small Cell Lung Carcinoma/genetics
- Small Cell Lung Carcinoma/pathology
- Xenograft Model Antitumor Assays
- Pancreatic Neoplasms
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Affiliation(s)
- Sardar F Mahmood
- National Center for Scientific Research (CNRS), UMR 144, Institut Curie, Paris, France; Research Center, Institut Curie, Paris, France
| | - Nadège Gruel
- Research Center, Institut Curie, Paris, France; Translational Research Department, Institut Curie, Paris, France; National Institute of Health and Medical Research (INSERM), U830, Institut Curie, Paris, France
| | - Rémy Nicolle
- National Center for Scientific Research (CNRS), UMR 144, Institut Curie, Paris, France; Research Center, Institut Curie, Paris, France
| | - Elodie Chapeaublanc
- National Center for Scientific Research (CNRS), UMR 144, Institut Curie, Paris, France; Research Center, Institut Curie, Paris, France
| | - Olivier Delattre
- Research Center, Institut Curie, Paris, France; National Institute of Health and Medical Research (INSERM), U830, Institut Curie, Paris, France
| | - François Radvanyi
- National Center for Scientific Research (CNRS), UMR 144, Institut Curie, Paris, France; Research Center, Institut Curie, Paris, France
| | - Isabelle Bernard-Pierrot
- National Center for Scientific Research (CNRS), UMR 144, Institut Curie, Paris, France; Research Center, Institut Curie, Paris, France.
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12
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Violet PC, Billon-Denis E, Robin P. Inhibition of lipid phosphate phosphatase activity by VPC32183 suppresses the ability of diacylglycerol pyrophosphate to activate ERK(1/2) MAP kinases. Biochim Biophys Acta Mol Cell Biol Lipids 2012; 1821:1394-405. [PMID: 22820196 DOI: 10.1016/j.bbalip.2012.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 06/26/2012] [Accepted: 07/11/2012] [Indexed: 11/17/2022]
Abstract
The lipidic metabolite, diacylglycerol pyrophosphate (DGPP), in its dioctanoyl form (DGPP 8:0), has been described as an antagonist for mammalian lysophosphatidic acid (LPA) receptors LPA1 and LPA3. In this study we show that DGPP 8:0 does not antagonize LPA dependent activation of ERK(1/2) MAP kinases but strongly stimulated them in various mammalian cell lines. LPA and DGPP 8:0 stimulation of ERK(1/2) occurred through different pathways. The DGPP 8:0 effect appeared to be dependent on PKC, Raf and MEK but was insensitive to pertussis toxin and did not involve G protein activation. Finally we showed that DGPP 8:0 effect on ERK(1/2) was dependent on its dephosphorylation by a phosphatase activity sharing lipid phosphate phosphatase properties. The inhibition of this phosphatase activity by VPC32183, a previously characterized LPA receptor antagonist, blocked the DGPP 8:0 effect on ERK(1/2) activation. Moreover, down-regulation of lipid phosphate phosphatase 1 (LPP1) expression by RNA interference technique also reduced DGPP 8:0-induced ERK(1/2) activation. Consistently, over expression of LPP1 in HEK293 cells increases DGPP 8:0 hydrolysis and this increased activity was inhibited by VPC32183. In conclusion, DGPP 8:0 does not exert its effect by acting on a G protein coupled receptor, but through its dephosphorylation by LPP1, generating dioctanoyl phosphatidic acid which in turn activates PKC. These results suggest that LPP1 could have a positive regulatory function on cellular signaling processes such as ERK(1/2) activation.
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Affiliation(s)
- Pierre-Christian Violet
- Université Paris-Sud 11, Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, CNRS UMR 8619, 91405 Orsay CEDEX, France
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13
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Kok BPC, Venkatraman G, Capatos D, Brindley DN. Unlike two peas in a pod: lipid phosphate phosphatases and phosphatidate phosphatases. Chem Rev 2012; 112:5121-46. [PMID: 22742522 DOI: 10.1021/cr200433m] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Bernard P C Kok
- Signal Transduction Research Group, Department of Biochemistry, School of Translational Medicine, University of Alberta, Edmonton, Alberta T6G 2S2, Canada
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14
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Liu GH, Gerace L. Sumoylation regulates nuclear localization of lipin-1alpha in neuronal cells. PLoS One 2009; 4:e7031. [PMID: 19753306 PMCID: PMC2737637 DOI: 10.1371/journal.pone.0007031] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Accepted: 08/24/2009] [Indexed: 12/24/2022] Open
Abstract
Lipin-1 is a protein that has dual functions as a phosphatidic acid phosphohydrolase (PAP) and a nuclear transcriptional coactivator. It remains unknown how the nuclear localization and coactivator functions of lipin-1 are regulated. Here, we show that lipin-1 (including both the alpha and beta isoforms) is modified by sumoylation at two consensus sumoylation sites. We are unable to detect sumoylation of the related proteins lipin-2 and lipin-3. Lipin-1 is sumoylated at relatively high levels in brain, where lipin-1α is the predominant form. In cultured embryonic cortical neurons and SH-SY5Y neuronal cells, ectopically expressed lipin-1α is localized in both the nucleus and the cytoplasm, and the nuclear localization is abrogated by mutating the consensus sumyolation motifs. The sumoylation site mutant of lipin-1α loses the capacity to coactivate the transcriptional (co-) activators PGC-1α and MEF2, consistent with its nuclear exclusion. Thus, these results show that sumoylation facilitates the nuclear localization and transcriptional coactivator behavior of lipin-1α that we observe in cultured neuronal cells, and suggest that lipin-1α may act as a sumoylation-regulated transcriptional coactivator in brain.
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Affiliation(s)
- Guang-Hui Liu
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail: (LG); (GHL)
| | - Larry Gerace
- Department of Cell Biology, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail: (LG); (GHL)
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15
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Regulation of myoblast differentiation by the nuclear envelope protein NET39. Mol Cell Biol 2009; 29:5800-12. [PMID: 19704009 DOI: 10.1128/mcb.00684-09] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recently, several transmembrane proteins of the nuclear envelope have been implicated in regulation of signaling and gene expression. Here we demonstrate that the nuclear lamina-associated nuclear envelope transmembrane protein NET39 (Ppapdc3) functions as a negative regulator of myoblast differentiation, in part through effects on mTOR signaling. We found that NET39 is highly expressed in cardiac and skeletal muscle tissues and becomes strongly upregulated during cultured myoblast differentiation. Knockdown of NET39 by RNA interference in myoblasts strongly promoted differentiation, whereas overexpression of NET39 repressed myogenesis. Proteomic analysis of NET39 complexes immunoprecipitated from myotubes, in combination with other methods, identified mTOR as an interaction partner of NET39. We found that ectopic expression of NET39 in myoblasts negatively regulated myogenesis by diminishing mTOR activity, which in turn decreased insulin-like growth factor II production and autocrine signaling. Our results indicate that NET39 is part of the regulatory machinery for myogenesis and raise the possibility that it may be important for muscle homeostasis.
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16
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Theofilopoulos S, Lykidis A, Leondaritis G, Mangoura D. Novel function of the human presqualene diphosphate phosphatase as a type II phosphatidate phosphatase in phosphatidylcholine and triacylglyceride biosynthesis pathways. Biochim Biophys Acta Mol Cell Biol Lipids 2008; 1781:731-42. [DOI: 10.1016/j.bbalip.2008.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Revised: 08/29/2008] [Accepted: 09/11/2008] [Indexed: 11/27/2022]
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