Publication Date:
2005-10-22
Description:
Blood calcium concentration is maintained within a narrow range despite large variations in dietary input and body demand. The Transient Receptor Potential ion channel TRPV5 has been implicated in this process. We report here that TRPV5 is stimulated by the mammalian hormone klotho. Klotho, a beta-glucuronidase, hydrolyzes extracellular sugar residues on TRPV5, entrapping the channel in the plasma membrane. This maintains durable calcium channel activity and membrane calcium permeability in kidney. Thus, klotho activates a cell surface channel by hydrolysis of its extracellular N-linked oligosaccharides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, Q -- Hoefs, S -- van der Kemp, A W -- Topala, C N -- Bindels, R J -- Hoenderop, J G -- New York, N.Y. -- Science. 2005 Oct 21;310(5747):490-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16239475" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Calcium/metabolism
;
Calcium Channels/genetics/*metabolism
;
Cell Line
;
Cell Membrane/metabolism
;
Cells, Cultured
;
Glucuronidase/antagonists & inhibitors/metabolism
;
Glycosylation
;
Humans
;
Hydrolysis
;
Kidney/cytology/metabolism
;
Membrane Proteins/*metabolism
;
Mice
;
Mice, Inbred C57BL
;
Mutation
;
Patch-Clamp Techniques
;
Protein Transport
;
Rabbits
;
Sodium/metabolism
;
TRPV Cation Channels/genetics/*metabolism
;
Transfection
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
