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Model SV40-transformed fibroblast lines for metabolic studies of human prosaposin and acid ceramidase deficiencies

Identifieur interne : 002929 ( Istex/Corpus ); précédent : 002928; suivant : 002930

Model SV40-transformed fibroblast lines for metabolic studies of human prosaposin and acid ceramidase deficiencies

Auteurs : Martine Chatelut ; Klaus Harzer ; Helen Christomanou ; Jean Feunteun ; Marie-Thérèse Pieraggi ; Barbara C. Paton ; Yasuo Kishimoto ; John S. O'Brien ; Jean-Pierre Basile ; Jean-Claude Thiers ; Robert Salvayre ; Thierry Levade

Source :

RBID : ISTEX:DCFFFFDE3F417DC08D4E382405F19004B4C73D91

English descriptors

Abstract

Abstract: Skin fibroblasts from patients with Farber disease (acid ceramidase deficiency) and from two siblings of the only known family affected with prosaposin deficiency were transformed by transfection with a plasmid carrying the SV40 large T antigen. The prosaposin-deficient transformed cell lines conserved their original metabolic defects, and in particular they were free of detectable immunoreactivity when using anti-saposin B and anti-saposin C antisera. Ultrastructurally, the cells contained heterogeneous lysosomal storage products. As found for their parental cell lines, the SV40-transformed fibroblasts exhibited deficient in vitro activities of lysosomal ceramidase and β-galactosylceramidase, but a normal activity of acid sphingomyelinase. As observed for SV40-transformed fibroblasts from Farber disease, degradation of radioactive glucosylceramide or low density lipoprotein-associated radiolabelled sphingomyelin by the prosaposin-deficient cells in situ showed a clear impairment in the turnover of lysosomal ceramide. Ceramide storage in prosaposin-deficient cells was also demonstrated by ceramide mass determination. In contrast to acid ceramidase deficient cells, both the accumulation of ceramide and the reduced in vitro activity of acid ceramidase in cells from prosaposin deficiency could be corrected by addition of purified saposin D. The data confirm that prosaposin is required for lysosomal ceramide degradation, but not for sphingomyelin turnover. The SV40-transformed fibroblasts will be useful for pathophysiological studies on human prosaposin deficiency.

Url:
DOI: 10.1016/S0009-8981(97)06527-3

Links to Exploration step

ISTEX:DCFFFFDE3F417DC08D4E382405F19004B4C73D91

Le document en format XML

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<term>Activator</term>
<term>Assay</term>
<term>Biochem</term>
<term>Biol</term>
<term>Biol chem</term>
<term>Cell lines</term>
<term>Ceramidase</term>
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<term>Fetal sibling</term>
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<term>Gaucher</term>
<term>Gaucher spleen</term>
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<term>Human prosaposin deficiency</term>
<term>Initiation codon</term>
<term>Kishimoto</term>
<term>Lipid</term>
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<term>Loading test</term>
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<div type="abstract" xml:lang="en">Abstract: Skin fibroblasts from patients with Farber disease (acid ceramidase deficiency) and from two siblings of the only known family affected with prosaposin deficiency were transformed by transfection with a plasmid carrying the SV40 large T antigen. The prosaposin-deficient transformed cell lines conserved their original metabolic defects, and in particular they were free of detectable immunoreactivity when using anti-saposin B and anti-saposin C antisera. Ultrastructurally, the cells contained heterogeneous lysosomal storage products. As found for their parental cell lines, the SV40-transformed fibroblasts exhibited deficient in vitro activities of lysosomal ceramidase and β-galactosylceramidase, but a normal activity of acid sphingomyelinase. As observed for SV40-transformed fibroblasts from Farber disease, degradation of radioactive glucosylceramide or low density lipoprotein-associated radiolabelled sphingomyelin by the prosaposin-deficient cells in situ showed a clear impairment in the turnover of lysosomal ceramide. Ceramide storage in prosaposin-deficient cells was also demonstrated by ceramide mass determination. In contrast to acid ceramidase deficient cells, both the accumulation of ceramide and the reduced in vitro activity of acid ceramidase in cells from prosaposin deficiency could be corrected by addition of purified saposin D. The data confirm that prosaposin is required for lysosomal ceramide degradation, but not for sphingomyelin turnover. The SV40-transformed fibroblasts will be useful for pathophysiological studies on human prosaposin deficiency.</div>
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<ce:simple-para>Skin fibroblasts from patients with Farber disease (acid ceramidase deficiency) and from two siblings of the only known family affected with prosaposin deficiency were transformed by transfection with a plasmid carrying the SV40 large T antigen. The prosaposin-deficient transformed cell lines conserved their original metabolic defects, and in particular they were free of detectable immunoreactivity when using anti-saposin B and anti-saposin C antisera. Ultrastructurally, the cells contained heterogeneous lysosomal storage products. As found for their parental cell lines, the SV40-transformed fibroblasts exhibited deficient in vitro activities of lysosomal ceramidase and β-galactosylceramidase, but a normal activity of acid sphingomyelinase. As observed for SV40-transformed fibroblasts from Farber disease, degradation of radioactive glucosylceramide or low density lipoprotein-associated radiolabelled sphingomyelin by the prosaposin-deficient cells in situ showed a clear impairment in the turnover of lysosomal ceramide. Ceramide storage in prosaposin-deficient cells was also demonstrated by ceramide mass determination. In contrast to acid ceramidase deficient cells, both the accumulation of ceramide and the reduced in vitro activity of acid ceramidase in cells from prosaposin deficiency could be corrected by addition of purified saposin D. The data confirm that prosaposin is required for lysosomal ceramide degradation, but not for sphingomyelin turnover. The SV40-transformed fibroblasts will be useful for pathophysiological studies on human prosaposin deficiency.</ce:simple-para>
</ce:abstract-sec>
</ce:abstract>
<ce:keywords>
<ce:section-title>Keywords</ce:section-title>
<ce:keyword>
<ce:text>Prosaposin</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Saposin</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Ceramide</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Ceramidase</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Sphingomyelin</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Lysosomes</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Lysosomal storage disease</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Fibroblasts (SV40-transformed)</ce:text>
</ce:keyword>
</ce:keywords>
<ce:keywords class="abr">
<ce:section-title>Abbreviations</ce:section-title>
<ce:keyword>
<ce:text>SPM, sphingomyelin</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>LDL, low density lipoprotein</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>TLC, thin-layer chromatography</ce:text>
</ce:keyword>
</ce:keywords>
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<title>Model SV40-transformed fibroblast lines for metabolic studies of human prosaposin and acid ceramidase deficiencies</title>
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<namePart type="given">Martine</namePart>
<namePart type="family">Chatelut</namePart>
<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
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<namePart type="given">Jean</namePart>
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<affiliation>Laboratoire de Génétique Oncologique, U.R.A. 1967 CNRS, Institut Gustave Roussy, Villejuif, France</affiliation>
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<namePart type="given">Marie-Thérèse</namePart>
<namePart type="family">Pieraggi</namePart>
<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
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<namePart type="given">Barbara C.</namePart>
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<affiliation>Department of Chemical Pathology, Women's and Children's Hospital, North Adelaide, Australia</affiliation>
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<name type="personal">
<namePart type="given">Yasuo</namePart>
<namePart type="family">Kishimoto</namePart>
<affiliation>Department of Neurosciences, University of California-San Diego, Center for Molecular Genetics, La Jolla, CA, USA</affiliation>
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<affiliation>Department of Neurosciences, University of California-San Diego, Center for Molecular Genetics, La Jolla, CA, USA</affiliation>
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<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
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<namePart type="given">Jean-Claude</namePart>
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<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
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<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
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<namePart type="given">Thierry</namePart>
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<affiliation>Corresponding author: Tel.: (33) 05.61.32.20.60. Fax: (33) 05.61.32.29.53.</affiliation>
<affiliation>Laboratoire de Biochimie, “Maladies Métaboliques”, INSERM U. 466, Institut Louis Bugnard, C.H.U. Rangueil, F-31403 Toulouse, France</affiliation>
<affiliation>E-mail: levade@rangueil.inserm.fr</affiliation>
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<abstract lang="en">Abstract: Skin fibroblasts from patients with Farber disease (acid ceramidase deficiency) and from two siblings of the only known family affected with prosaposin deficiency were transformed by transfection with a plasmid carrying the SV40 large T antigen. The prosaposin-deficient transformed cell lines conserved their original metabolic defects, and in particular they were free of detectable immunoreactivity when using anti-saposin B and anti-saposin C antisera. Ultrastructurally, the cells contained heterogeneous lysosomal storage products. As found for their parental cell lines, the SV40-transformed fibroblasts exhibited deficient in vitro activities of lysosomal ceramidase and β-galactosylceramidase, but a normal activity of acid sphingomyelinase. As observed for SV40-transformed fibroblasts from Farber disease, degradation of radioactive glucosylceramide or low density lipoprotein-associated radiolabelled sphingomyelin by the prosaposin-deficient cells in situ showed a clear impairment in the turnover of lysosomal ceramide. Ceramide storage in prosaposin-deficient cells was also demonstrated by ceramide mass determination. In contrast to acid ceramidase deficient cells, both the accumulation of ceramide and the reduced in vitro activity of acid ceramidase in cells from prosaposin deficiency could be corrected by addition of purified saposin D. The data confirm that prosaposin is required for lysosomal ceramide degradation, but not for sphingomyelin turnover. The SV40-transformed fibroblasts will be useful for pathophysiological studies on human prosaposin deficiency.</abstract>
<note type="content">Section title: Research article</note>
<subject>
<genre>Keywords</genre>
<topic>Prosaposin</topic>
<topic>Saposin</topic>
<topic>Ceramide</topic>
<topic>Ceramidase</topic>
<topic>Sphingomyelin</topic>
<topic>Lysosomes</topic>
<topic>Lysosomal storage disease</topic>
<topic>Fibroblasts (SV40-transformed)</topic>
</subject>
<subject>
<genre>Abbreviations</genre>
<topic>SPM, sphingomyelin</topic>
<topic>LDL, low density lipoprotein</topic>
<topic>TLC, thin-layer chromatography</topic>
</subject>
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<dateIssued encoding="w3cdtf">19970627</dateIssued>
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<identifier type="ISSN">0009-8981</identifier>
<identifier type="PII">S0009-8981(00)X0049-6</identifier>
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