Linked Life Data

20219947

Source:http://linkedlifedata.com/resource/pubmed/id/20219947

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-5-21
pubmed:abstractText
Recessive inheritance of mutations in ceroid neuronal lipofuscinosis type 3 (CLN3) results in juvenile neuronal ceroid lipofuscinosis (JNCL), a childhood neurodegenerative disease with symptoms including loss of vision, seizures, and motor and mental decline. CLN3p is a transmembrane protein with undefined function. Using a Cln3 reporter mouse harboring a nuclear-localized bacterial beta-galactosidase (beta-Gal) gene driven by the native Cln3 promoter, we detected beta-Gal most prominently in epithelial cells of skin, colon, lung, and kidney. In the kidney, beta-Gal-positive nuclei were predominant in medullary collecting duct principal cells, with increased expression along the medullary osmotic gradient. Quantification of Cln3 transcript levels from kidneys of wild-type (Cln3(+/+)) mice corroborated this expression gradient. Reporter mouse-derived renal epithelial cultures demonstrated a tonicity-dependent increase in beta-Gal expression. RT-quantitative PCR determination of Cln3 transcript levels further supported osmoregulation at the Cln3 locus. In vivo, osmoresponsiveness of Cln3 was demonstrated by reduction of medullary Cln3 transcript abundance after furosemide administration. Primary cultures of epithelial cells of the inner medulla from Cln3(lacZ/lacZ) (CLN3p-null) mice showed no defect in osmolyte accumulation or taurine flux, arguing against a requirement for CLN3p in osmolyte import or synthesis. CLN3p-deficient mice with free access to water showed a mild urine-concentrating defect but, upon water deprivation, were able to concentrate their urine normally. Unexpectedly, we found that CLN3p-deficient mice were hyperkalemic and had a low fractional excretion of K(+). Together, these findings suggest an osmoregulated role for CLN3p in renal control of water and K(+) balance.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1522-1563
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
298
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
C1388-400
pubmed:meshHeading
pubmed-meshheading:20219947-Animals, pubmed-meshheading:20219947-Cells, Cultured, pubmed-meshheading:20219947-Drinking, pubmed-meshheading:20219947-Epithelial Cells, pubmed-meshheading:20219947-Genes, Reporter, pubmed-meshheading:20219947-Genotype, pubmed-meshheading:20219947-Hyperkalemia, pubmed-meshheading:20219947-Kidney Concentrating Ability, pubmed-meshheading:20219947-Kidney Medulla, pubmed-meshheading:20219947-Membrane Glycoproteins, pubmed-meshheading:20219947-Mice, pubmed-meshheading:20219947-Mice, Inbred C57BL, pubmed-meshheading:20219947-Mice, Transgenic, pubmed-meshheading:20219947-Molecular Chaperones, pubmed-meshheading:20219947-Neuronal Ceroid-Lipofuscinoses, pubmed-meshheading:20219947-Phenotype, pubmed-meshheading:20219947-Potassium, pubmed-meshheading:20219947-Promoter Regions, Genetic, pubmed-meshheading:20219947-RNA, Messenger, pubmed-meshheading:20219947-Taurine, pubmed-meshheading:20219947-Urination, pubmed-meshheading:20219947-Water-Electrolyte Balance, pubmed-meshheading:20219947-beta-Galactosidase
pubmed:year
2010
pubmed:articleTitle
Osmoregulation of ceroid neuronal lipofuscinosis type 3 in the renal medulla.
pubmed:affiliation
Department of Internal Medicine, University of Iowa, Iowa City, IA 52242, USA. colleen-stein@uiowa.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural