Abstract：
:Transient receptor potential cation channel-2 (TRPP2) is a nonspecific Ca2+ -dependent cation channel with versatile functions including control of extracellular calcium entry at the plasma membrane, release of intracellular calcium ([Ca2+ ]i) from internal stores of endoplasmic reticulum, and calcium-dependent mechanosensation in the primary cilium. In early Xenopus embryos, TRPP2 is expressed in cilia of the gastrocoel roof plate (GRP) involved in the establishment of left-right asymmetry, and in nonciliated kidney field (KF) cells, where it plays a central role in early specification of nephron tubule cells dependent on [Ca2+ ]i signaling. Identification of proteins binding to TRPP2 in embryo cells can provide interesting clues about the mechanisms involved in its regulation during these various processes. Using mass spectrometry, we have therefore characterized proteins from late gastrula/early neurula stage embryos coimmunoprecipitating with TRPP2. Binding of three of these proteins, golgin A2, protein kinase-D1, and disheveled-2 has been confirmed by immunoblotting analysis of TRPP2-coprecipitated proteins. Expression analysis of the genes, respectively, encoding these proteins, golga2, prkd1, and dvl2 indicates that they are likely to play a role in these two regions. Golga2 and prkd1 are expressed at later stage in the developing pronephric tubule where golgin A2 and protein kinase-D1 might also interact with TRPP2. Colocalization experiments using exogenously expressed fluorescent versions of TRPP2 and dvl2 in GRP and KF reveal that these two proteins are generally not coexpressed, and only colocalized in discrete region of cells. This was observed in KF cells, but does not appear to occur in the apical ciliated region of GRP cells.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Futel M,Le Bouffant R,Buisson I,Umbhauer M,Riou JFdoi
10.1002/jcb.27376subject
Has Abstractpub_date
2018-12-01 00:00:00pages
10338-10350issue
12eissn
0730-2312issn
1097-4644journal_volume
119pub_type
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