| pubmed-article:16361256 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:16361256 | lifeskim:mentions | umls-concept:C0023779 | lld:lifeskim |
| pubmed-article:16361256 | lifeskim:mentions | umls-concept:C0001128 | lld:lifeskim |
| pubmed-article:16361256 | lifeskim:mentions | umls-concept:C0441655 | lld:lifeskim |
| pubmed-article:16361256 | lifeskim:mentions | umls-concept:C0851285 | lld:lifeskim |
| pubmed-article:16361256 | pubmed:issue | 11 | lld:pubmed |
| pubmed-article:16361256 | pubmed:dateCreated | 2006-3-13 | lld:pubmed |
| pubmed-article:16361256 | pubmed:abstractText | Mucolipidosis type IV (MLIV) is caused by mutations in the ion channel mucolipin 1 (TRP-ML1). MLIV is typified by accumulation of lipids and membranous materials in intracellular organelles, which was hypothesized to be caused by the altered membrane fusion and fission events. How mutations in TRP-ML1 lead to aberrant lipolysis is not known. Here we present evidence that MLIV is a metabolic disorder that is not associated with aberrant membrane fusion/fission events. Thus, measurement of lysosomal pH revealed that the lysosomes in TRP-ML1(-/-) cells obtained from the patients with MLIV are over-acidified. TRP-ML1 can function as a H(+) channel, and the increased lysosomal acidification in TRP-ML1(-/-) cells is likely caused by the loss of TRP-ML1-mediated H(+) leak. Measurement of lipase activity using several substrates revealed a marked reduction in lipid hydrolysis in TRP-ML1(-/-) cells, which was rescued by the expression of TRP-ML1. Cell fractionation indicated specific loss of acidic lipase activity in TRP-ML1(-/-) cells. Furthermore, dissipation of the acidic lysosomal pH of TRP-ML1(-/-) cells by nigericin or chloroquine reversed the lysosomal storage disease phenotype. These findings provide a new mechanism to account for the pathogenesis of MLIV. | lld:pubmed |
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| pubmed-article:16361256 | pubmed:language | eng | lld:pubmed |
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| pubmed-article:16361256 | pubmed:citationSubset | IM | lld:pubmed |
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| pubmed-article:16361256 | pubmed:status | MEDLINE | lld:pubmed |
| pubmed-article:16361256 | pubmed:month | Mar | lld:pubmed |
| pubmed-article:16361256 | pubmed:issn | 0021-9258 | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:MuallemShmuel... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:KiselyovKiril... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:SoyomboAbigai... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:RbaibiYoussef... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:Tjon-Kon-Sang... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:BashllariEnke... | lld:pubmed |
| pubmed-article:16361256 | pubmed:author | pubmed-author:BiscegliaJill... | lld:pubmed |
| pubmed-article:16361256 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:16361256 | pubmed:day | 17 | lld:pubmed |
| pubmed-article:16361256 | pubmed:volume | 281 | lld:pubmed |
| pubmed-article:16361256 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:16361256 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:16361256 | pubmed:pagination | 7294-301 | lld:pubmed |
| pubmed-article:16361256 | pubmed:dateRevised | 2007-11-15 | lld:pubmed |
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| pubmed-article:16361256 | pubmed:year | 2006 | lld:pubmed |
| pubmed-article:16361256 | pubmed:articleTitle | TRP-ML1 regulates lysosomal pH and acidic lysosomal lipid hydrolytic activity. | lld:pubmed |
| pubmed-article:16361256 | pubmed:affiliation | Department of Physiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA. | lld:pubmed |
| pubmed-article:16361256 | pubmed:publicationType | Journal Article | lld:pubmed |
| pubmed-article:16361256 | pubmed:publicationType | Research Support, Non-U.S. Gov't | lld:pubmed |
| pubmed-article:16361256 | pubmed:publicationType | Research Support, N.I.H., Extramural | lld:pubmed |
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