Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death

Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in t...
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Autor*in:	S. Giri [verfasserIn] M. Khan [verfasserIn] R. Rattan [verfasserIn] I. Singh [verfasserIn] A.K. Singh [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2006

Schlagwörter:	twitcher apopoptosis sPLA2 inhibitor LPC

Übergeordnetes Werk:	In: Journal of Lipid Research - Elsevier, 2021, 47(2006), 7, Seite 1478-1492
Übergeordnetes Werk:	volume:47 ; year:2006 ; number:7 ; pages:1478-1492

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1194/jlr.M600084-JLR200

Katalog-ID:	DOAJ058474048

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allfields	10.1194/jlr.M600084-JLR200 doi (DE-627)DOAJ058474048 (DE-599)DOAJd52181e19c7b4c66bef431609b1544ca DE-627 ger DE-627 rakwb eng QD415-436 S. Giri verfasserin aut Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease. twitcher apopoptosis sPLA2 inhibitor LPC Biochemistry M. Khan verfasserin aut R. Rattan verfasserin aut I. Singh verfasserin aut A.K. Singh verfasserin aut In Journal of Lipid Research Elsevier, 2021 47(2006), 7, Seite 1478-1492 (DE-627)26601593X (DE-600)1466675-3 15397262 nnns volume:47 year:2006 number:7 pages:1478-1492 https://doi.org/10.1194/jlr.M600084-JLR200 kostenfrei https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca kostenfrei http://www.sciencedirect.com/science/article/pii/S0022227520331928 kostenfrei https://doaj.org/toc/0022-2275 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 47 2006 7 1478-1492
spelling	10.1194/jlr.M600084-JLR200 doi (DE-627)DOAJ058474048 (DE-599)DOAJd52181e19c7b4c66bef431609b1544ca DE-627 ger DE-627 rakwb eng QD415-436 S. Giri verfasserin aut Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease. twitcher apopoptosis sPLA2 inhibitor LPC Biochemistry M. Khan verfasserin aut R. Rattan verfasserin aut I. Singh verfasserin aut A.K. Singh verfasserin aut In Journal of Lipid Research Elsevier, 2021 47(2006), 7, Seite 1478-1492 (DE-627)26601593X (DE-600)1466675-3 15397262 nnns volume:47 year:2006 number:7 pages:1478-1492 https://doi.org/10.1194/jlr.M600084-JLR200 kostenfrei https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca kostenfrei http://www.sciencedirect.com/science/article/pii/S0022227520331928 kostenfrei https://doaj.org/toc/0022-2275 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 47 2006 7 1478-1492
allfields_unstemmed	10.1194/jlr.M600084-JLR200 doi (DE-627)DOAJ058474048 (DE-599)DOAJd52181e19c7b4c66bef431609b1544ca DE-627 ger DE-627 rakwb eng QD415-436 S. Giri verfasserin aut Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease. twitcher apopoptosis sPLA2 inhibitor LPC Biochemistry M. Khan verfasserin aut R. Rattan verfasserin aut I. Singh verfasserin aut A.K. Singh verfasserin aut In Journal of Lipid Research Elsevier, 2021 47(2006), 7, Seite 1478-1492 (DE-627)26601593X (DE-600)1466675-3 15397262 nnns volume:47 year:2006 number:7 pages:1478-1492 https://doi.org/10.1194/jlr.M600084-JLR200 kostenfrei https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca kostenfrei http://www.sciencedirect.com/science/article/pii/S0022227520331928 kostenfrei https://doaj.org/toc/0022-2275 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 47 2006 7 1478-1492
allfieldsGer	10.1194/jlr.M600084-JLR200 doi (DE-627)DOAJ058474048 (DE-599)DOAJd52181e19c7b4c66bef431609b1544ca DE-627 ger DE-627 rakwb eng QD415-436 S. Giri verfasserin aut Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease. twitcher apopoptosis sPLA2 inhibitor LPC Biochemistry M. Khan verfasserin aut R. Rattan verfasserin aut I. Singh verfasserin aut A.K. Singh verfasserin aut In Journal of Lipid Research Elsevier, 2021 47(2006), 7, Seite 1478-1492 (DE-627)26601593X (DE-600)1466675-3 15397262 nnns volume:47 year:2006 number:7 pages:1478-1492 https://doi.org/10.1194/jlr.M600084-JLR200 kostenfrei https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca kostenfrei http://www.sciencedirect.com/science/article/pii/S0022227520331928 kostenfrei https://doaj.org/toc/0022-2275 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 47 2006 7 1478-1492
allfieldsSound	10.1194/jlr.M600084-JLR200 doi (DE-627)DOAJ058474048 (DE-599)DOAJd52181e19c7b4c66bef431609b1544ca DE-627 ger DE-627 rakwb eng QD415-436 S. Giri verfasserin aut Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease. twitcher apopoptosis sPLA2 inhibitor LPC Biochemistry M. Khan verfasserin aut R. Rattan verfasserin aut I. Singh verfasserin aut A.K. Singh verfasserin aut In Journal of Lipid Research Elsevier, 2021 47(2006), 7, Seite 1478-1492 (DE-627)26601593X (DE-600)1466675-3 15397262 nnns volume:47 year:2006 number:7 pages:1478-1492 https://doi.org/10.1194/jlr.M600084-JLR200 kostenfrei https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca kostenfrei http://www.sciencedirect.com/science/article/pii/S0022227520331928 kostenfrei https://doaj.org/toc/0022-2275 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_252 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 47 2006 7 1478-1492
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author	S. Giri
spellingShingle	S. Giri misc QD415-436 misc twitcher misc apopoptosis misc sPLA2 inhibitor misc LPC misc Biochemistry Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death
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topic_title	QD415-436 Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death twitcher apopoptosis sPLA2 inhibitor LPC
topic	misc QD415-436 misc twitcher misc apopoptosis misc sPLA2 inhibitor misc LPC misc Biochemistry
topic_unstemmed	misc QD415-436 misc twitcher misc apopoptosis misc sPLA2 inhibitor misc LPC misc Biochemistry
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title	Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death
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title_full	Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death
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author_browse	S. Giri M. Khan R. Rattan I. Singh A.K. Singh
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title_sort	krabbe disease: psychosine-mediated activation of phospholipase a2 in oligodendrocyte cell death
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title_auth	Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death
abstract	Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease.
abstractGer	Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease.
abstract_unstemmed	Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside β-galactosidase. This study underscores the mechanism of action of psychosine in the regulation of oligodendrocyte cell death via the generation of lysophosphatidylcholine (LPC) and arachidonic acid (AA) by the activation of secretory phospholipase A2 (sPLA2). There was a significant increase in the level of LPC, indicating a phospholipase A2 (PLA2)-dependent pathobiology, in the brains of Krabbe disease patients and those of twitcher mice, an animal model of Krabbe disease. In vitro studies of the treatment of primary oligodendrocytes and the oligodendrocyte MO3.13 cell line with psychosine also showed the generation of LPC and the release of AA in a dose- and time-dependent manner, indicating psychosine-induced activation of PLA2. Studies with various pharmacological inhibitors of cytosolic phospholipase A2 and sPLA2 and psychosine-mediated induction of sPLA2 enzymatic activity in media supernatant suggest that psychosine-induced release of AA and generation of LPC is mainly contributed by sPLA2. An inhibitor of sPLA2, 7,7-dimethyl eicosadienoic acid, completely attenuated the psychosine-mediated accumulation of LPC levels, release of AA, and generation of reactive oxygen species, and blocked oligodendroyte cell death, as evident from cell survival, DNA fragmentation, and caspase 3 activity assays. This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease.
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title_short	Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death
url	https://doi.org/10.1194/jlr.M600084-JLR200 https://doaj.org/article/d52181e19c7b4c66bef431609b1544ca http://www.sciencedirect.com/science/article/pii/S0022227520331928 https://doaj.org/toc/0022-2275
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This study documents for the first time that psychosine-induced cell death is mediated via the sPLA2 signaling pathway and that inhibitors of sPLA2 may hold a therapeutic potential for protection against oligodendrocyte cell death and resulting demyelination in Krabbe disease.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">twitcher</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">apopoptosis</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">sPLA2 inhibitor</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">LPC</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Biochemistry</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">M. Khan</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">R. 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Krabbe disease: psychosine-mediated activation of phospholipase A2 in oligodendrocyte cell death

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