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Moriwaki T, Terawaki S, Otomo T. Impaired lysosomal acidity maintenance in acid lipase-deficient cells leads to defective autophagy. J Biol Chem 2024; 300:105743. [PMID: 38354786 PMCID: PMC10933554 DOI: 10.1016/j.jbc.2024.105743] [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: 10/30/2023] [Revised: 01/25/2024] [Accepted: 02/03/2024] [Indexed: 02/16/2024] Open
Abstract
The lysosome is an acid organelle that contains a variety of hydrolytic enzymes and plays a significant role in intracellular degradation to maintain cellular homeostasis. Genetic variants in lysosome-related genes can lead to severe congenital diseases, such as lysosomal storage diseases. In the present study, we investigated the impact of depleting lysosomal acid lipase A (LIPA), a lysosomal esterase that metabolizes esterified cholesterol or triglyceride, on lysosomal function. Under nutrient-rich conditions, LIPA gene KO (LIPAKO) cells exhibited impaired autophagy, whereas, under starved conditions, they showed normal autophagy. The cause underlying the differential autophagic activity was increased sensitivity of LIPAKO cells to ammonia, which was produced from l-glutamine in the medium. Further investigation revealed that ammonia did not affect upstream signals involved in autophagy induction, autophagosome-lysosome fusion, and hydrolytic enzyme activities in LIPAKO cells. On the other hand, LIPAKO cells showed defective lysosomal acidity upon ammonia loading. Microscopic analyses revealed that lysosomes of LIPAKO cells enlarged, whereas the amount of lysosomal proton pump V-ATPase did not proportionally increase. Since the enlargement of lysosomes in LIPAKO cells was not normalized under starved conditions, this is the primary change that occurred in the LIPAKO cells, and autophagy was affected by impaired lysosomal function under the specific conditions. These findings expand our comprehension of the pathogenesis of Wolman's disease, which is caused by a defect in the LIPA gene, and suggest that conditions, such as hyperlipidemia, may easily disrupt lysosomal functions.
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Affiliation(s)
- Takahito Moriwaki
- Department of Molecular and Genetic Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Seigo Terawaki
- Department of Molecular and Genetic Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
| | - Takanobu Otomo
- Department of Molecular and Genetic Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan.
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2
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LeVine SM. Examining the Role of a Functional Deficiency of Iron in Lysosomal Storage Disorders with Translational Relevance to Alzheimer's Disease. Cells 2023; 12:2641. [PMID: 37998376 PMCID: PMC10670892 DOI: 10.3390/cells12222641] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/09/2023] [Accepted: 11/13/2023] [Indexed: 11/25/2023] Open
Abstract
The recently presented Azalea Hypothesis for Alzheimer's disease asserts that iron becomes sequestered, leading to a functional iron deficiency that contributes to neurodegeneration. Iron sequestration can occur by iron being bound to protein aggregates, such as amyloid β and tau, iron-rich structures not undergoing recycling (e.g., due to disrupted ferritinophagy and impaired mitophagy), and diminished delivery of iron from the lysosome to the cytosol. Reduced iron availability for biochemical reactions causes cells to respond to acquire additional iron, resulting in an elevation in the total iron level within affected brain regions. As the amount of unavailable iron increases, the level of available iron decreases until eventually it is unable to meet cellular demands, which leads to a functional iron deficiency. Normally, the lysosome plays an integral role in cellular iron homeostasis by facilitating both the delivery of iron to the cytosol (e.g., after endocytosis of the iron-transferrin-transferrin receptor complex) and the cellular recycling of iron. During a lysosomal storage disorder, an enzyme deficiency causes undigested substrates to accumulate, causing a sequelae of pathogenic events that may include cellular iron dyshomeostasis. Thus, a functional deficiency of iron may be a pathogenic mechanism occurring within several lysosomal storage diseases and Alzheimer's disease.
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Affiliation(s)
- Steven M LeVine
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
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3
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Hong X, Pollard L, He M, Gelb MH, Wood TC. Multiplex tandem mass spectrometry enzymatic activity assay for the screening and diagnosis of Mucolipidosis type II and III. Mol Genet Metab Rep 2023; 35:100978. [PMID: 37275682 PMCID: PMC10233272 DOI: 10.1016/j.ymgmr.2023.100978] [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] [Received: 05/04/2023] [Accepted: 05/05/2023] [Indexed: 06/07/2023] Open
Abstract
Mucolipidosis type II and III (MLII/III) is caused by defects in the mannose-6-phosphate system, which is essential to target most of the lysosomal hydrolases to the lysosome. MLII/III patients present with marked elevations in the activities of most lysosomal enzymes in plasma, but their profiles in dried blood spots (DBS) have not been well described. In the current study, we measured the activities of 12 lysosomal enzymes in DBS, among which acid sphingomyelinase, iduronate-2-sulfatase, and alpha-N-acetylglucosaminidase were significantly elevated in MLII/III patients when compared to random newborns. This sets the stage for using DBS to diagnose MLII/III. Furthermore, given an increasing number of lysosomal storage disorders are being included in the recommended uniform screening panel, our results also indicate that population-based newborn screening for MLII/III can be implemented with minimal efforts.
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Affiliation(s)
- Xinying Hong
- Department of Chemistry, University of Washington, Seattle, WA, USA
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | | | - Miao He
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Michael H. Gelb
- Department of Chemistry, University of Washington, Seattle, WA, USA
- Department of Biochemistry, University of Washington, Seattle, WA, USA
| | - Timothy C. Wood
- Department of Pediatrics, University of Colorado Anschutz Medical Campus/Children's Hospital of Colorado, Aurora, CO, USA
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4
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Zhang W, Yang X, Li Y, Yu L, Zhang B, Zhang J, Cho WJ, Venkatarangan V, Chen L, Burugula BB, Bui S, Wang Y, Duan C, Kitzman JO, Li M. GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway. Nat Commun 2022; 13:5351. [PMID: 36096887 PMCID: PMC9468337 DOI: 10.1038/s41467-022-33025-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/29/2022] [Indexed: 11/09/2022] Open
Abstract
The mannose-6-phosphate (M6P) biosynthetic pathway for lysosome biogenesis has been studied for decades and is considered a well-understood topic. However, whether this pathway is regulated remains an open question. In a genome-wide CRISPR/Cas9 knockout screen, we discover TMEM251 as the first regulator of the M6P modification. Deleting TMEM251 causes mistargeting of most lysosomal enzymes due to their loss of M6P modification and accumulation of numerous undigested materials. We further demonstrate that TMEM251 localizes to the Golgi and is required for the cleavage and activity of GNPT, the enzyme that catalyzes M6P modification. In zebrafish, TMEM251 deletion leads to severe developmental defects including heart edema and skeletal dysplasia, which phenocopies Mucolipidosis Type II. Our discovery provides a mechanism for the newly discovered human disease caused by TMEM251 mutations. We name TMEM251 as GNPTAB cleavage and activity factor (GCAF) and its related disease as Mucolipidosis Type V.
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Affiliation(s)
- Weichao Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Xi Yang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Yingxiang Li
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Linchen Yu
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bokai Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jianchao Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Woo Jung Cho
- BRCF Microscopy Core, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Varsha Venkatarangan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Liang Chen
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bala Bharathi Burugula
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Sarah Bui
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Yanzhuang Wang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Cunming Duan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jacob O Kitzman
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Ming Li
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA.
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5
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Ford C, Parchure A, von Blume J, Burd CG. Cargo sorting at the trans-Golgi network at a glance. J Cell Sci 2021; 134:jcs259110. [PMID: 34870705 PMCID: PMC8714066 DOI: 10.1242/jcs.259110] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The Golgi functions principally in the biogenesis and trafficking of glycoproteins and lipids. It is compartmentalized into multiple flattened adherent membrane sacs termed cisternae, which each contain a distinct repertoire of resident proteins, principally enzymes that modify newly synthesized proteins and lipids sequentially as they traffic through the stack of Golgi cisternae. Upon reaching the final compartments of the Golgi, the trans cisterna and trans-Golgi network (TGN), processed glycoproteins and lipids are packaged into coated and non-coated transport carriers derived from the trans Golgi and TGN. The cargoes of clathrin-coated vesicles are chiefly residents of endo-lysosomal organelles, while uncoated carriers ferry cargo to the cell surface. There are outstanding questions regarding the mechanisms of protein and lipid sorting within the Golgi for export to different organelles. Nonetheless, conceptual advances have begun to define the key molecular features of cargo clients and the mechanisms underlying their sorting into distinct export pathways, which we have collated in this Cell Science at a Glance article and the accompanying poster.
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Affiliation(s)
| | | | - Julia von Blume
- Department of Cell Biology, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
| | - Christopher G. Burd
- Department of Cell Biology, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
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6
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Understanding amphisomes. Biochem J 2021; 478:1959-1976. [PMID: 34047789 DOI: 10.1042/bcj20200917] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/27/2021] [Accepted: 05/06/2021] [Indexed: 12/14/2022]
Abstract
Amphisomes are intermediate/hybrid organelles produced through the fusion of endosomes with autophagosomes within cells. Amphisome formation is an essential step during a sequential maturation process of autophagosomes before their ultimate fusion with lysosomes for cargo degradation. This process is highly regulated with multiple protein machineries, such as SNAREs, Rab GTPases, tethering complexes, and ESCRTs, are involved to facilitate autophagic flux to proceed. In neurons, autophagosomes are robustly generated in axonal terminals and then rapidly fuse with late endosomes to form amphisomes. This fusion event allows newly generated autophagosomes to gain retrograde transport motility and move toward the soma, where proteolytically active lysosomes are predominantly located. Amphisomes are not only the products of autophagosome maturation but also the intersection of the autophagy and endo-lysosomal pathways. Importantly, amphisomes can also participate in non-canonical functions, such as retrograde neurotrophic signaling or autophagy-based unconventional secretion by fusion with the plasma membrane. In this review, we provide an updated overview of the recent discoveries and advancements on the molecular and cellular mechanisms underlying amphisome biogenesis and the emerging roles of amphisomes. We discuss recent developments towards the understanding of amphisome regulation as well as the implications in the context of major neurodegenerative diseases, with a comparative focus on Alzheimer's disease and Parkinson's disease.
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7
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Xiao Y, Hu F, Luo X, Zhao M, Sun Z, Qian X, Yang Y. Modulating the pKa Values of Hill-Type pH Probes for Biorelevant Acidic pH Range. ACS APPLIED BIO MATERIALS 2020; 4:2097-2103. [DOI: 10.1021/acsabm.0c01262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yansheng Xiao
- State Key Laboratory of Bioreactor Engineering, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Fang Hu
- State Key Laboratory of Bioreactor Engineering, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Xiao Luo
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Mingming Zhao
- Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine Chinese Academy of Medical Science, Beijing 100730, China
| | - Zhenglong Sun
- Suzhou Institute of Biomedical Engineering and Technology (SIBET), Chinese Academy of Sciences, Suzhou 215163, China
| | - Xuhong Qian
- State Key Laboratory of Bioreactor Engineering, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Youjun Yang
- State Key Laboratory of Bioreactor Engineering, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
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8
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Mucolipidoses Overview: Past, Present, and Future. Int J Mol Sci 2020; 21:ijms21186812. [PMID: 32957425 PMCID: PMC7555117 DOI: 10.3390/ijms21186812] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/13/2020] [Accepted: 09/14/2020] [Indexed: 12/12/2022] Open
Abstract
Mucolipidosis II and III (ML II/III) are caused by a deficiency of uridine-diphosphate N-acetylglucosamine: lysosomal-enzyme-N-acetylglucosamine-1-phosphotransferase (GlcNAc-1-phosphotransferase, EC2.7.8.17), which tags lysosomal enzymes with a mannose 6-phosphate (M6P) marker for transport to the lysosome. The process is performed by a sequential two-step process: first, GlcNAc-1-phosphotransferase catalyzes the transfer of GlcNAc-1-phosphate to the selected mannose residues on lysosomal enzymes in the cis-Golgi network. The second step removes GlcNAc from lysosomal enzymes by N-acetylglucosamine-1-phosphodiester α-N-acetylglucosaminidase (uncovering enzyme) and exposes the mannose 6-phosphate (M6P) residues in the trans-Golgi network, in which the enzymes are targeted to the lysosomes by M6Preceptors. A deficiency of GlcNAc-1-phosphotransferase causes the hypersecretion of lysosomal enzymes out of cells, resulting in a shortage of multiple lysosomal enzymes within lysosomes. Due to a lack of GlcNAc-1-phosphotransferase, the accumulation of cholesterol, phospholipids, glycosaminoglycans (GAGs), and other undegraded substrates occurs in the lysosomes. Clinically, ML II and ML III exhibit quite similar manifestations to mucopolysaccharidoses (MPSs), including specific skeletal deformities known as dysostosis multiplex and gingival hyperplasia. The life expectancy is less than 10 years in the severe type, and there is no definitive treatment for this disease. In this review, we have described the updated diagnosis and therapy on ML II/III.
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9
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Kloska A, Węsierska M, Malinowska M, Gabig-Cimińska M, Jakóbkiewicz-Banecka J. Lipophagy and Lipolysis Status in Lipid Storage and Lipid Metabolism Diseases. Int J Mol Sci 2020; 21:E6113. [PMID: 32854299 PMCID: PMC7504288 DOI: 10.3390/ijms21176113] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/12/2020] [Accepted: 08/21/2020] [Indexed: 12/15/2022] Open
Abstract
This review discusses how lipophagy and cytosolic lipolysis degrade cellular lipids, as well as how these pathway ys communicate, how they affect lipid metabolism and energy homeostasis in cells and how their dysfunction affects the pathogenesis of lipid storage and lipid metabolism diseases. Answers to these questions will likely uncover novel strategies for the treatment of aforementioned human diseases, but, above all, will avoid destructive effects of high concentrations of lipids-referred to as lipotoxicity-resulting in cellular dysfunction and cell death.
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Affiliation(s)
- Anna Kloska
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (A.K.); (M.W.); (M.M.)
| | - Magdalena Węsierska
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (A.K.); (M.W.); (M.M.)
| | - Marcelina Malinowska
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (A.K.); (M.W.); (M.M.)
| | - Magdalena Gabig-Cimińska
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (A.K.); (M.W.); (M.M.)
- Laboratory of Molecular Biology, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Kładki 24, 80-822 Gdańsk, Poland
| | - Joanna Jakóbkiewicz-Banecka
- Department of Medical Biology and Genetics, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (A.K.); (M.W.); (M.M.)
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10
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Stepien KM, Roncaroli F, Turton N, Hendriksz CJ, Roberts M, Heaton RA, Hargreaves I. Mechanisms of Mitochondrial Dysfunction in Lysosomal Storage Disorders: A Review. J Clin Med 2020; 9:jcm9082596. [PMID: 32796538 PMCID: PMC7463786 DOI: 10.3390/jcm9082596] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial dysfunction is emerging as an important contributory factor to the pathophysiology of lysosomal storage disorders (LSDs). The cause of mitochondrial dysfunction in LSDs appears to be multifactorial, although impaired mitophagy and oxidative stress appear to be common inhibitory mechanisms shared amongst these heterogeneous disorders. Once impaired, dysfunctional mitochondria may impact upon the function of the lysosome by the generation of reactive oxygen species as well as depriving the lysosome of ATP which is required by the V-ATPase proton pump to maintain the acidity of the lumen. Given the reported evidence of mitochondrial dysfunction in LSDs together with the important symbiotic relationship between these two organelles, therapeutic strategies targeting both lysosome and mitochondrial dysfunction may be an important consideration in the treatment of LSDs. In this review we examine the putative mechanisms that may be responsible for mitochondrial dysfunction in reported LSDs which will be supplemented with morphological and clinical information.
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Affiliation(s)
- Karolina M. Stepien
- Adult Inherited Metabolic Diseases, Salford Royal NHS Foundation Trust, Salford M6 8HD, UK
- Correspondence:
| | - Federico Roncaroli
- Division of Neuroscience and Experimental Psychology, School of Biology, Medicine and Health, University of Manchester and Manchester Centre for Clinical Neuroscience, Salford Royal NHS Foundation Trust, Salford M6 8HD, UK;
| | - Nadia Turton
- School of Pharmacy, Liverpool John Moore University, Byrom Street, Liverpool L3 3AF, UK; (N.T.); (R.A.H.); (I.H.)
| | - Christian J. Hendriksz
- Paediatrics and Child Health, Steve Biko Academic Unit, University of Pretoria, 0002 Pretoria, South Africa;
| | - Mark Roberts
- Neurology Department, Salford Royal NHS Foundation Trust, Salford M6 8HD, UK;
| | - Robert A. Heaton
- School of Pharmacy, Liverpool John Moore University, Byrom Street, Liverpool L3 3AF, UK; (N.T.); (R.A.H.); (I.H.)
| | - Iain Hargreaves
- School of Pharmacy, Liverpool John Moore University, Byrom Street, Liverpool L3 3AF, UK; (N.T.); (R.A.H.); (I.H.)
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11
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Wheeler S, Haberkant P, Bhardwaj M, Tongue P, Ferraz MJ, Halter D, Sprong H, Schmid R, Aerts JM, Sullo N, Sillence DJ. Cytosolic glucosylceramide regulates endolysosomal function in Niemann-Pick type C disease. Neurobiol Dis 2019; 127:242-252. [DOI: 10.1016/j.nbd.2019.03.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 03/06/2019] [Accepted: 03/09/2019] [Indexed: 12/22/2022] Open
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12
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Developing a novel ratiometric fluorescent probe based on ESIPT for the detection of pH changes in living cells. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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13
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Chao JB, Li M, Zhang YB, Yin CX, Huo FJ. A simple fluorescent pH probe and its application in cells. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00699-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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14
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Quinoline-based ratiometric fluorescent probe for detection of physiological pH changes in aqueous solution and living cells. Talanta 2019; 192:6-13. [DOI: 10.1016/j.talanta.2018.09.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 09/07/2018] [Accepted: 09/09/2018] [Indexed: 12/17/2022]
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15
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Padamsey Z, McGuinness L, Emptage NJ. Inhibition of lysosomal Ca 2+ signalling disrupts dendritic spine structure and impairs wound healing in neurons. Commun Integr Biol 2017; 10:e1344802. [PMID: 29259727 PMCID: PMC5731510 DOI: 10.1080/19420889.2017.1344802] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 06/14/2017] [Accepted: 06/15/2017] [Indexed: 11/21/2022] Open
Abstract
A growing body of evidence suggests that lysosomes, which have traditionally been regarded as degradative organelles, can function as Ca2+ stores, regulated by the second messenger nicotinic acid adenine dinucleotide phosphate (NAADP). We previously demonstrated that in hippocampal pyramidal neurons, activity-dependent Ca2+ release from these stores triggers fusion of the lysosome with the plasma membrane. We found that the physiological role of this Ca2+-dependent fusion was to maintain the long-term structural enlargement of dendritic spines induced by synaptic activity. Here, we examined the pathophysiological consequences of lysosomal dysfunction in hippocampal pyramidal neurons by chronically inhibiting lysosomal Ca2+ signalling using the NAADP antagonist, NED-19. We found that within just 20 hours, inhibition of lysosomal function led to a profound intracellular accumulation of lysosomal membrane. This was accompanied by a significant change in dendritic spine structure, which included a lengthening of dendritic spines, an increase in the number of filipodia, and an overall decrease in spine number. Inhibition of lysosomal function also inhibited wound healing in neurons by preventing lysosomal fusion with the plasma membrane. Neurons were therefore more susceptible to injury. Our findings suggest that dysfunction in lysosomal Ca2+ signalling and lysosomal fusion with the plasma membrane may contribute to the loss of dendritic spines and neurons seen in neurological disorders, such as Niemann-Pick disease type C1, in which lysosomal function is impaired.
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Affiliation(s)
- Zahid Padamsey
- Department of Pharmacology, University of Oxford, Oxford, UK
| | | | - Nigel J Emptage
- Department of Pharmacology, University of Oxford, Oxford, UK
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16
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Kondo H, Maksimova N, Otomo T, Kato H, Imai A, Asano Y, Kobayashi K, Nojima S, Nakaya A, Hamada Y, Irahara K, Gurinova E, Sukhomyasova A, Nogovicina A, Savvina M, Yoshimori T, Ozono K, Sakai N. Mutation in VPS33A affects metabolism of glycosaminoglycans: a new type of mucopolysaccharidosis with severe systemic symptoms. Hum Mol Genet 2017; 26:173-183. [PMID: 28013294 DOI: 10.1093/hmg/ddw377] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 10/27/2016] [Indexed: 11/12/2022] Open
Abstract
Mucopolysaccharidoses (MPS) are a group of genetic deficiencies of lysosomal enzymes that catabolize glycosaminoglycans (GAG). Here we describe a novel MPS-like disease caused by a specific mutation in the VPS33A gene. We identified several Yakut patients showing typical manifestations of MPS: coarse facial features, skeletal abnormalities, hepatosplenomegaly, respiratory problems, mental retardation, and excess secretion of urinary GAG. However, these patients could not be diagnosed enzymatically as MPS. They showed extremely high levels of plasma heparan sulphate (HS, one of GAG); 60 times the normal reference range and 6 times that of MPS patients. Additionally, most patients developed heart, kidney, and hematopoietic disorders, which are not typical symptoms for conventional MPS, leading to a fatal outcome between 1 and 2-years old. Using whole exome and Sanger sequencing, we identified homozygous c.1492C > T (p.Arg498Trp) mutations in the VPS33A gene of 13 patients. VPS33A is involved in endocytic and autophagic pathways, but the identified mutation did not affect either of these pathways. Lysosomal over-acidification and HS accumulation were detected in patient-derived and VPS33A-depleted cells, suggesting a novel role of this gene in lysosomal functions. We hence propose a new type of MPS that is not caused by an enzymatic deficiency.
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Affiliation(s)
- Hidehito Kondo
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Nadezda Maksimova
- Laboratory of Genome Medicine, Clinics of Medical Institute, North East Federal University, Yakutsk, Russia
| | - Takanobu Otomo
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan.,Department of Genetics.,Research Center for Autophagy
| | | | - Atsuko Imai
- Department of Cardiology.,Department of Genome Informatics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | | | - Kaori Kobayashi
- Department of Genome Informatics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan.,Medical Solutions Division, NEC Corporation, Shiba, Minato-ku, Tokyo, Japan
| | - Satoshi Nojima
- Department of Pathology, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Akihiro Nakaya
- Department of Genome Informatics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Yusuke Hamada
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Kaori Irahara
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Elizaveta Gurinova
- Republican Hospital no. 1, National Medical Center of the Republic of Sakha, Yakutsk, Russia
| | - Aitalina Sukhomyasova
- Laboratory of Genome Medicine, Clinics of Medical Institute, North East Federal University, Yakutsk, Russia.,Republican Hospital no. 1, National Medical Center of the Republic of Sakha, Yakutsk, Russia
| | - Anna Nogovicina
- Republican Hospital no. 1, National Medical Center of the Republic of Sakha, Yakutsk, Russia
| | - Mira Savvina
- Laboratory of Genome Medicine, Clinics of Medical Institute, North East Federal University, Yakutsk, Russia
| | | | - Keiichi Ozono
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan
| | - Norio Sakai
- Department of Pediatrics, Osaka University Graduate School of Medicine, Yamadaoka, Suita, Osaka, Japan.,Division of Health Science, Child Healthcare and Genetic Science Laboratory, Osaka University Graduate School of Medicine, Yamadaoka, Osaka, Japan
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17
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Aarnio-Peterson M, Zhao P, Yu SH, Christian C, Flanagan-Steet H, Wells L, Steet R. Altered Met receptor phosphorylation and LRP1-mediated uptake in cells lacking carbohydrate-dependent lysosomal targeting. J Biol Chem 2017; 292:15094-15104. [PMID: 28724630 DOI: 10.1074/jbc.m117.790139] [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: 04/19/2017] [Revised: 07/14/2017] [Indexed: 11/06/2022] Open
Abstract
Acid hydrolases utilize a carbohydrate-dependent mechanism for lysosomal targeting. These hydrolases acquire a mannose 6-phosphate tag by the action of the GlcNAc-1-phosphotransferase enzyme, allowing them to bind receptors and traffic to endosomes. Loss of GlcNAc-1-phosphotransferase results in hydrolase hypersecretion and profound lysosomal storage. Little, however, is known about how these cellular phenotypes affect the trafficking, activity, and localization of surface glycoproteins. To address this question, we profiled the abundance of surface glycoproteins in WT and CRISPR-mediated GNPTAB-/- HeLa cells and identified changes in numerous glycoproteins, including the uptake receptor LRP1 and multiple receptor tyrosine kinases. Decreased cell surface LRP1 in GNPTAB-/- cells corresponded with a reduction in its steady-state level and less amyloid-β-40 (Aβ40) peptide uptake. GNPTAB-/- cells displayed elevated activation of several kinases including Met receptor. We found increased Met phosphorylation within both the kinase and the docking domains and observed that lower concentrations of pervanadate were needed to cause an increase in phospho-Met in GNPTAB-/- cells. Together, these data suggested a decrease in the activity of the receptor and non-receptor protein-tyrosine phosphatases that down-regulate Met phosphorylation. GNPTAB-/- cells exhibited elevated levels of reactive oxygen species, known to inactivate cell surface and cytosolic phosphatases by oxidation of active site cysteine residues. Consistent with this mode of action, peroxide treatment of parental HeLa cells elevated phospho-Met levels whereas antioxidant treatment of GNPTAB-/- cells reduced phospho-Met levels. Collectively, these findings identify new mechanisms whereby impaired lysosomal targeting can impact the activity and recycling of receptors.
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Affiliation(s)
- Megan Aarnio-Peterson
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Peng Zhao
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Seok-Ho Yu
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Courtney Christian
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Heather Flanagan-Steet
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Lance Wells
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Richard Steet
- From the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
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18
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Andrade SS, Sumikawa JT, Castro ED, Batista FP, Paredes-Gamero E, Oliveira LC, Guerra IM, Peres GB, Cavalheiro RP, Juliano L, Nazário AP, Facina G, Tsai SM, Oliva MLV, Girão MJBC. Interface between breast cancer cells and the tumor microenvironment using platelet-rich plasma to promote tumor angiogenesis - influence of platelets and fibrin bundles on the behavior of breast tumor cells. Oncotarget 2017; 8:16851-16874. [PMID: 28187434 PMCID: PMC5370006 DOI: 10.18632/oncotarget.15170] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 01/24/2017] [Indexed: 12/27/2022] Open
Abstract
Cancer progression is associated with an evolving tissue interface of direct epithelial-tumor microenvironment interactions. In biopsies of human breast tumors, extensive alterations in molecular pathways are correlated with cancer staging on both sides of the tumor-stroma interface. These interactions provide a pivotal paracrine signaling to induce malignant phenotype transition, the epithelial-mesenchymal transition (EMT). We explored how the direct contact between platelets-fibrin bundles primes metastasis using platelet-rich plasma (PRP) as a source of growth factors and mimics the provisional fibrin matrix between actively growing breast cancer cells and the tumor stroma. We have demonstrated PRP functions, modulating cell proliferation that is tumor-subtype and cancer cell-type-specific. Epithelial and stromal primary cells were prepared from breast cancer biopsies from 21 women with different cancer subtypes. Cells supplemented with PRP were immunoblotted with anti-phospho and total Src-Tyr-416, FAK-Try-925, E-cadherin, N-cadherin, TGF-β, Smad2, and Snail monoclonal antibodies. Breast tumor cells from luminal B and HER2 subtypes showed the most malignant profiles and the expression of thrombin and other classes of proteases at levels that were detectable through FRET peptide libraries. The angiogenesis process was investigated in the interface obtained between platelet-fibrin-breast tumor cells co-cultured with HUVEC cells. Luminal B and HER2 cells showed robust endothelial cell capillary-like tubes ex vivo. The studied interface contributes to the attachment of endothelial cells, provides a source of growth factors, and is a solid substrate. Thus, replacement of FBS supplementation with PRP supplementation represents an efficient and simple approach for mimicking the real multifactorial tumor microenvironment.
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Affiliation(s)
- Sheila Siqueira Andrade
- Department of Gynecology of The Federal University of São Paulo, Brazil
- Charitable Association of Blood Collection – COLSAN, São Paulo, SP, Brazil
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture CENA, University of São Paulo USP, Piracicaba, SP, Brazil
| | | | | | | | | | | | | | | | | | - Luiz Juliano
- Department of Biophysics of The Federal University of São Paulo, Brazil
| | | | - Gil Facina
- Department of Gynecology of The Federal University of São Paulo, Brazil
| | - Siu Mui Tsai
- Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture CENA, University of São Paulo USP, Piracicaba, SP, Brazil
| | | | - Manoel João Batista Castello Girão
- Department of Gynecology of The Federal University of São Paulo, Brazil
- Charitable Association of Blood Collection – COLSAN, São Paulo, SP, Brazil
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19
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de la Mata M, Cotán D, Villanueva-Paz M, de Lavera I, Álvarez-Córdoba M, Luzón-Hidalgo R, Suárez-Rivero JM, Tiscornia G, Oropesa-Ávila M. Mitochondrial Dysfunction in Lysosomal Storage Disorders. Diseases 2016; 4:E31. [PMID: 28933411 PMCID: PMC5456326 DOI: 10.3390/diseases4040031] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 09/21/2016] [Accepted: 10/01/2016] [Indexed: 12/28/2022] Open
Abstract
Lysosomal storage diseases (LSDs) describe a heterogeneous group of rare inherited metabolic disorders that result from the absence or loss of function of lysosomal hydrolases or transporters, resulting in the progressive accumulation of undigested material in lysosomes. The accumulation of substances affects the function of lysosomes and other organelles, resulting in secondary alterations such as impairment of autophagy, mitochondrial dysfunction, inflammation and apoptosis. LSDs frequently involve the central nervous system (CNS), where neuronal dysfunction or loss results in progressive neurodegeneration and premature death. Many LSDs exhibit signs of mitochondrial dysfunction, which include mitochondrial morphological changes, decreased mitochondrial membrane potential (ΔΨm), diminished ATP production and increased generation of reactive oxygen species (ROS). Furthermore, reduced autophagic flux may lead to the persistence of dysfunctional mitochondria. Gaucher disease (GD), the LSD with the highest prevalence, is caused by mutations in the GBA1 gene that results in defective and insufficient activity of the enzyme β-glucocerebrosidase (GCase). Decreased catalytic activity and/or instability of GCase leads to accumulation of glucosylceramide (GlcCer) and glucosylsphingosine (GlcSph) in the lysosomes of macrophage cells and visceral organs. Mitochondrial dysfunction has been reported to occur in numerous cellular and mouse models of GD. The aim of this manuscript is to review the current knowledge and implications of mitochondrial dysfunction in LSDs.
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Affiliation(s)
- Mario de la Mata
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - David Cotán
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Marina Villanueva-Paz
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Isabel de Lavera
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Mónica Álvarez-Córdoba
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Raquel Luzón-Hidalgo
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Juan M Suárez-Rivero
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
| | - Gustavo Tiscornia
- Department of Biomedical Sciences and Medicine, University of Algarve, Faro 8005-139, Portugal.
| | - Manuel Oropesa-Ávila
- Centro Andaluz de Biología del Desarrollo (CABD-CSIC-Universidad Pablo de Olavide), Sevilla 41013, Spain.
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20
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Hasegawa J, Iwamoto R, Otomo T, Nezu A, Hamasaki M, Yoshimori T. Autophagosome-lysosome fusion in neurons requires INPP5E, a protein associated with Joubert syndrome. EMBO J 2016; 35:1853-67. [PMID: 27340123 DOI: 10.15252/embj.201593148] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 05/27/2016] [Indexed: 12/20/2022] Open
Abstract
Autophagy is a multistep membrane traffic pathway. In contrast to autophagosome formation, the mechanisms underlying autophagosome-lysosome fusion remain largely unknown. Here, we describe a novel autophagy regulator, inositol polyphosphate-5-phosphatase E (INPP5E), involved in autophagosome-lysosome fusion process. In neuronal cells, INPP5E knockdown strongly inhibited autophagy by impairing the fusion step. A fraction of INPP5E is localized to lysosomes, and its membrane anchoring and enzymatic activity are necessary for autophagy. INPP5E decreases lysosomal phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), one of the substrates of the phosphatase, that counteracts cortactin-mediated actin filament stabilization on lysosomes. Lysosomes require actin filaments on their surface for fusing with autophagosomes. INPP5E is one of the genes responsible for Joubert syndrome, a rare brain abnormality, and mutations found in patients with this disease caused defects in autophagy. Taken together, our data reveal a novel role of phosphoinositide on lysosomes and an association between autophagy and neuronal disease.
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Affiliation(s)
- Junya Hasegawa
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences Osaka University, Osaka, Japan Department of Genetics, Graduate School of Medicine Osaka University, Osaka, Japan
| | - Ryo Iwamoto
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences Osaka University, Osaka, Japan
| | - Takanobu Otomo
- Department of Genetics, Graduate School of Medicine Osaka University, Osaka, Japan
| | - Akiko Nezu
- Department of Genetics, Graduate School of Medicine Osaka University, Osaka, Japan
| | - Maho Hamasaki
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences Osaka University, Osaka, Japan Department of Genetics, Graduate School of Medicine Osaka University, Osaka, Japan
| | - Tamotsu Yoshimori
- Laboratory of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences Osaka University, Osaka, Japan Department of Genetics, Graduate School of Medicine Osaka University, Osaka, Japan
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21
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Onyenwoke RU, Brenman JE. Lysosomal Storage Diseases-Regulating Neurodegeneration. J Exp Neurosci 2016; 9:81-91. [PMID: 27081317 PMCID: PMC4822725 DOI: 10.4137/jen.s25475] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 11/11/2015] [Accepted: 11/16/2015] [Indexed: 12/19/2022] Open
Abstract
Autophagy is a complex pathway regulated by numerous signaling events that recycles macromolecules and can be perturbed in lysosomal storage diseases (LSDs). The concept of LSDs, which are characterized by aberrant, excessive storage of cellular material in lysosomes, developed following the discovery of an enzyme deficiency as the cause of Pompe disease in 1963. Great strides have since been made in better understanding the biology of LSDs. Defective lysosomal storage typically occurs in many cell types, but the nervous system, including the central nervous system and peripheral nervous system, is particularly vulnerable to LSDs, being affected in two-thirds of LSDs. This review provides a summary of some of the better characterized LSDs and the pathways affected in these disorders.
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Affiliation(s)
- Rob U Onyenwoke
- Department of Pharmaceutical Science, Biomanufacturing Research Institute and Technology Enterprise (BRITE), North Carolina Central University, Durham, NC, USA
| | - Jay E Brenman
- Department of Cell Biology and Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.; Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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22
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First-Generation Antipsychotic Haloperidol Alters the Functionality of the Late Endosomal/Lysosomal Compartment in Vitro. Int J Mol Sci 2016; 17:404. [PMID: 26999125 PMCID: PMC4813259 DOI: 10.3390/ijms17030404] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 03/07/2016] [Accepted: 03/14/2016] [Indexed: 01/18/2023] Open
Abstract
First- and second-generation antipsychotics (FGAs and SGAs, respectively), have the ability to inhibit cholesterol biosynthesis and also to interrupt the intracellular cholesterol trafficking, interfering with low-density lipoprotein (LDL)-derived cholesterol egress from late endosomes/lysosomes. In the present work, we examined the effects of FGA haloperidol on the functionality of late endosomes/lysosomes in vitro. In HepG2 hepatocarcinoma cells incubated in the presence of 1,1'-dioctadecyl-3,3,3,3'-tetramethylindocarbocyanineperchlorate (DiI)-LDL, treatment with haloperidol caused the enlargement of organelles positive for late endosome markers lysosome-associated membrane protein 2 (LAMP-2) and LBPA (lysobisphosphatidic acid), which also showed increased content of both free-cholesterol and DiI derived from LDL. This indicates the accumulation of LDL-lipids in the late endosomal/lysosomal compartment caused by haloperidol. In contrast, LDL traffic through early endosomes and the Golgi apparatus appeared to be unaffected by the antipsychotic as the distribution of both early endosome antigen 1 (EEA1) and coatomer subunit β (β-COP) were not perturbed. Notably, treatment with haloperidol significantly increased the lysosomal pH and decreased the activities of lysosomal protease and β-d-galactosidase in a dose-dependent manner. We conclude that the alkalinization of the lysosomes' internal milieu induced by haloperidol affects lysosomal functionality.
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23
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Révélation néonatale d’une mucolipidose de type II. Arch Pediatr 2016; 23:71-4. [DOI: 10.1016/j.arcped.2015.09.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 06/24/2015] [Accepted: 09/28/2015] [Indexed: 11/22/2022]
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24
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Tan JL, Yang TT, Liu Y, Zhang X, Cheng SJ, Zuo H, He H. Sensitive detection of strong acidic condition by a novel rhodamine-based fluorescent pH chemosensor. LUMINESCENCE 2015; 31:865-70. [DOI: 10.1002/bio.3043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Revised: 08/24/2015] [Accepted: 09/02/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Jia-Lian Tan
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Ting-Ting Yang
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Yu Liu
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Xue Zhang
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Shu-Jin Cheng
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Hua Zuo
- College of Pharmaceutical Sciences; Southwest University; Chongqing 400715 China
| | - Huawei He
- State Key Laboratory of Silkworm Genome Biology; Southwest University; Chongqing 400715 China
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25
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Klünder S, Heeren J, Markmann S, Santer R, Braulke T, Pohl S. Site-1 protease-activated formation of lysosomal targeting motifs is independent of the lipogenic transcription control. J Lipid Res 2015; 56:1625-32. [PMID: 26108224 DOI: 10.1194/jlr.m060756] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Indexed: 12/25/2022] Open
Abstract
Site-1 protease (S1P) cleaves membrane-bound lipogenic sterol regulatory element-binding proteins (SREBPs) and the α/β-subunit precursor protein of the N-acetylglucosamine-1-phosphotransferase forming mannose 6-phosphate (M6P) targeting markers on lysosomal enzymes. The translocation of SREBPs from the endoplasmic reticulum (ER) to the Golgi-resident S1P depends on the intracellular sterol content, but it is unknown whether the ER exit of the α/β-subunit precursor is regulated. Here, we investigated the effect of cholesterol depletion (atorvastatin treatment) and elevation (LDL overload) on ER-Golgi transport, S1P-mediated cleavage of the α/β-subunit precursor, and the subsequent targeting of lysosomal enzymes along the biosynthetic and endocytic pathway to lysosomes. The data showed that the proteolytic cleavage of the α/β-subunit precursor into mature and enzymatically active subunits does not depend on the cholesterol content. In either treatment, lysosomal enzymes are normally decorated with M6P residues, allowing the proper sorting to lysosomes. In addition, we found that, in fibroblasts of mucolipidosis type II mice and Niemann-Pick type C patients characterized by aberrant cholesterol accumulation, the proteolytic cleavage of the α/β-subunit precursor was not impaired. We conclude that S1P substrate-dependent regulatory mechanisms for lipid synthesis and biogenesis of lysosomes are different.
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Affiliation(s)
- Sarah Klünder
- Biochemistry Section, Children's Hospital, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Jörg Heeren
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Sandra Markmann
- Biochemistry Section, Children's Hospital, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - René Santer
- Biochemistry Section, Children's Hospital, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Thomas Braulke
- Biochemistry Section, Children's Hospital, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Sandra Pohl
- Biochemistry Section, Children's Hospital, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
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26
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Jung M, Lee J, Seo HY, Lim JS, Kim EK. Cathepsin inhibition-induced lysosomal dysfunction enhances pancreatic beta-cell apoptosis in high glucose. PLoS One 2015; 10:e0116972. [PMID: 25625842 PMCID: PMC4308077 DOI: 10.1371/journal.pone.0116972] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 12/17/2014] [Indexed: 12/19/2022] Open
Abstract
Autophagy is a lysosomal degradative pathway that plays an important role in maintaining cellular homeostasis. We previously showed that the inhibition of autophagy causes pancreatic β-cell apoptosis, suggesting that autophagy is a protective mechanism for the survival of pancreatic β-cells. The current study demonstrates that treatment with inhibitors and knockdown of the lysosomal cysteine proteases such as cathepsins B and L impair autophagy, enhancing the caspase-dependent apoptosis of INS-1 cells and islets upon exposure to high concentration of glucose. Interestingly, treatment with cathepsin B and L inhibitors prevented the proteolytic processing of cathepsins B, D and L, as evidenced by gradual accumulation of the respective pro-forms. Of note, inhibition of aspartic cathepsins had no effect on autophagy and cell viability, suggesting the selective role of cathepsins B and L in the regulation of β-cell autophagy and apoptosis. Lysosomal localization of accumulated pro-cathepsins in the presence of cathepsin B and L inhibitors was verified via immunocytochemistry and lysosomal fractionation. Lysotracker staining indicated that cathepsin B and L inhibitors led to the formation of severely enlarged lysosomes in a time-dependent manner. The abnormal accumulation of pro-cathepsins following treatment with inhibitors of cathepsins B and L suppressed normal lysosomal degradation and the processing of lysosomal enzymes, leading to lysosomal dysfunction. Collectively, our findings suggest that cathepsin defects following the inhibition of cathepsin B and L result in lysosomal dysfunction and consequent cell death in pancreatic β-cells.
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Affiliation(s)
- Minjeong Jung
- Department of Brain Science, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea
| | - Jaemeun Lee
- Department of Brain Science, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea
| | - Hye-Young Seo
- Department of Brain Science, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea
| | - Ji Sun Lim
- Department of Brain Science, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea
| | - Eun-Kyoung Kim
- Department of Brain Science, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea; Neurometabolomics Research Center, Daegu Gyeongbuk Institute of Science & Technology, Daegu, Korea
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27
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Zhang X, Song GJ, Cao XJ, Liu JT, Chen MY, Cao XQ, Zhao BX. A new fluorescent pH probe for acidic conditions. RSC Adv 2015. [DOI: 10.1039/c5ra14174e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A new fluorescent probe based on imidazo[1,5-a]pyridine probe for low pH was synthesized and characterized.
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Affiliation(s)
- Xuan Zhang
- Institute of Organic Chemistry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- PR China
| | | | - Xiang-Jian Cao
- Institute of Organic Chemistry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- PR China
| | - Jin-Ting Liu
- Institute of Organic Chemistry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- PR China
| | - Ming-Yu Chen
- Institute of Organic Chemistry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- PR China
| | | | - Bao-Xiang Zhao
- Institute of Organic Chemistry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- PR China
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28
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Sato Y, Kobayashi H, Sato S, Shimada Y, Fukuda T, Eto Y, Ohashi T, Ida H. Systemic accumulation of undigested lysosomal metabolites in an autopsy case of mucolipidosis type II; autophagic dysfunction in cardiomyocyte. Mol Genet Metab 2014; 112:224-8. [PMID: 24857410 DOI: 10.1016/j.ymgme.2014.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 05/03/2014] [Indexed: 10/25/2022]
Abstract
Mucolipidosis type II is an autosomal recessive lysosomal storage disease caused by N-acetylglucosamine-1-phosphotransferese deficiency. We report here pathological findings of an autopsy case of mucolipidosis type II. The patient was an 8-year-old boy with mucolipidosis type II and was complicated with hypertrophic cardiomyopathy. He suddenly developed progressive respiratory failure and finally died. At autopsy, systemic accumulation of undigested lysosomal metabolites was prominent, particularly in the heart, lungs, and dorsal root ganglion. In cardiomyocyte, LC3, an autophagy marker, was positive in the cytoplasm. Ubiquitin, p62, K48 polyubiquitin, and K63 polyubiquitin were also positive in the cytoplasm. Our findings suggest that autophagic dysfunction might be associated with the cardiomyopahty of mucolipidosis type II.
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Affiliation(s)
- Yohei Sato
- Department of Pediatrics, The Jikei University School of Medicine, Japan; Department of Gene Therapy, Institute of DNA Medicine, Research Center for Medical Sciences, The Jikei University School of Medicine, Japan.
| | - Hiroshi Kobayashi
- Department of Pediatrics, The Jikei University School of Medicine, Japan; Department of Gene Therapy, Institute of DNA Medicine, Research Center for Medical Sciences, The Jikei University School of Medicine, Japan
| | - Shun Sato
- Division of Pathology, The Jikei University School of Medicine, Japan
| | - Yohta Shimada
- Department of Gene Therapy, Institute of DNA Medicine, Research Center for Medical Sciences, The Jikei University School of Medicine, Japan
| | - Takahiro Fukuda
- Division of Neuropathology, Department of Pathology, The Jikei University School of Medicine, Japan
| | - Yoshikatsu Eto
- Department of Pediatrics, The Jikei University School of Medicine, Japan; Advanced Clinical Research Center, Institute of Neurological Diseases, Japan
| | - Toya Ohashi
- Department of Pediatrics, The Jikei University School of Medicine, Japan; Department of Gene Therapy, Institute of DNA Medicine, Research Center for Medical Sciences, The Jikei University School of Medicine, Japan
| | - Hiroyuki Ida
- Department of Pediatrics, The Jikei University School of Medicine, Japan; Department of Gene Therapy, Institute of DNA Medicine, Research Center for Medical Sciences, The Jikei University School of Medicine, Japan
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29
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Rappaport J, Garnacho C, Muro S. Clathrin-mediated endocytosis is impaired in type A-B Niemann-Pick disease model cells and can be restored by ICAM-1-mediated enzyme replacement. Mol Pharm 2014; 11:2887-95. [PMID: 24949999 PMCID: PMC4144747 DOI: 10.1021/mp500241y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
![]()
Drugs
often use endocytosis to achieve intracellular delivery,
either by passive uptake from the extracellular fluid or by active
targeting of cell surface features such as endocytic receptors. An
example is enzyme replacement therapy, a clinically practiced treatment
for several lysosomal storage diseases where glycosylated recombinant
enzymes naturally target the mannose-6-phosphate receptor and are
internalized by clathrin mediated endocytosis (CME). However, lysosomal
substrate accumulation, a hallmark of these diseases, has been indirectly
linked to aberrant endocytic activity. These effects are poorly understood,
creating an obstacle to therapeutic efficiency. Here we explored endocytic
activity in fibroblasts from patients with type A Niemann–Pick
disease, a lysosomal storage disease characterized by acid sphingomyelinase
(ASM) deficiency. The uptake of fluid phase markers and clathrin-associated
ligands, formation of endocytic structures, and recruitment of intracellular
clathrin to ligand binding sites were all altered, demonstrating aberrant
CME in these cells. Model polymer nanocarriers targeted to intercellular
adhesion molecule-1 (ICAM-1), which are internalized by a clathrin-independent
route, enhanced the intracellular delivery of recombinant ASM more
than 10-fold compared to free enzyme. This strategy reduced substrate
accumulation and restored clathrin endocytic activity to wild-type
levels. There appears to be a relationship between lysosomal storage
and diminished CME, and bypassing this pathway by targeting ICAM-1
may enhance future therapies for lysosomal storage diseases.
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Affiliation(s)
- Jeff Rappaport
- Fischell Department of Bioengineering, University of Maryland , College Park, Maryland 20742-4450, United States
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Xu Y, Jiang Z, Xiao Y, Bi FZ, Miao JY, Zhao BX. A new fluorescent pH probe for extremely acidic conditions. Anal Chim Acta 2014; 820:146-51. [DOI: 10.1016/j.aca.2014.02.029] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 02/13/2014] [Accepted: 02/20/2014] [Indexed: 01/12/2023]
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Saher G, Rudolphi F, Corthals K, Ruhwedel T, Schmidt KF, Löwel S, Dibaj P, Barrette B, Möbius W, Nave KA. Therapy of Pelizaeus-Merzbacher disease in mice by feeding a cholesterol-enriched diet. Nat Med 2012; 18:1130-5. [PMID: 22706386 DOI: 10.1038/nm.2833] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 05/15/2012] [Indexed: 12/14/2022]
Abstract
Duplication of PLP1 (proteolipid protein gene 1) and the subsequent overexpression of the myelin protein PLP (also known as DM20) in oligodendrocytes is the most frequent cause of Pelizaeus-Merzbacher disease (PMD), a fatal leukodystrophy without therapeutic options. PLP binds cholesterol and is contained within membrane lipid raft microdomains. Cholesterol availability is the rate-limiting factor of central nervous system myelin synthesis. Transgenic mice with extra copies of the Plp1 gene are accurate models of PMD. Dysmyelination followed by demyelination, secondary inflammation and axon damage contribute to the severe motor impairment in these mice. The finding that in Plp1-transgenic oligodendrocytes, PLP and cholesterol accumulate in late endosomes and lysosomes (endo/lysosomes), prompted us to further investigate the role of cholesterol in PMD. Here we show that cholesterol itself promotes normal PLP trafficking and that dietary cholesterol influences PMD pathology. In a preclinical trial, PMD mice were fed a cholesterol-enriched diet. This restored oligodendrocyte numbers and ameliorated intracellular PLP accumulation. Moreover, myelin content increased, inflammation and gliosis were reduced and motor defects improved. Even after onset of clinical symptoms, cholesterol treatment prevented disease progression. Dietary cholesterol did not reduce Plp1 overexpression but facilitated incorporation of PLP into myelin membranes. These findings may have implications for therapeutic interventions in patients with PMD.
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Affiliation(s)
- Gesine Saher
- Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany.
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Otomo T, Hossain MA, Ozono K, Sakai N. Genistein reduces heparan sulfate accumulation in human mucolipidosis II skin fibroblasts. Mol Genet Metab 2012; 105:266-9. [PMID: 22088809 DOI: 10.1016/j.ymgme.2011.10.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 10/25/2011] [Accepted: 10/25/2011] [Indexed: 11/30/2022]
Abstract
Genistein, a soy isoflavone, reduces glycosaminoglycan synthesis and its effect on mucopolysaccharidoses has been tested. In this report, we examined the effect of genistein in human mucolipidosis II skin fibroblasts in vitro. Heparan sulfate was accumulated within both cells and in extracellular spaces in mucolipidosis II. Genistein reduced the amount of heparan sulfate in cultured cells dose dependently and also inhibited cell growth dose dependently.
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Affiliation(s)
- Takanobu Otomo
- Department of Pediatrics, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan.
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