NDLI: Live-Cell Visualization of Intracellular Interaction between a Nuclear Migration Protein (hNUDC) and the Thrombopoietin Receptor (Mpl)

Content Provider	PubMed Central
Author	Zheng, Yuan-bin Xiao, Ying-ying Tan, Peng Zhang, Qing Xu, Peilin
Editor	Waller, Ross Frederick
Copyright Year	2012
Abstract	We previously demonstrated that endogenous hNUDC and Mpl co-localized in the perinuclear and cytoplasmic regions of megakaryocyte cells by indirect immunofluorescence. We further reported that hNUDC accumulated in the Golgi when NIH 3T3 cells were transfected with an hNUDC expression vector alone. However, co-transfection with hNUDC and Mpl expression vectors caused both proteins to co-localize predominantly in the cytosol. These observations led us to hypothesize that a complex containing hNUDC and Mpl may alter hNUDC subcellular location and induce its secretion. In the present study, we test this hypothesis by employing bimolecular fluorescence complementation (BiFC) to detect and visualize the complex formation of hNUDC/Mpl in living cells. We further examined in detail the subcellular locations of the hNUDC/Mpl complex by co-transfection of BiFC chimeras with known subcellular markers. The distribution of hNUDC/Mpl in the endoplasmic reticulum (ER), Golgi and cell surface was determined. Furthermore, the N-terminal 159 amino acids of hNUDC, but not C-terminal half, bound to Mpl in vivo and exhibited a similar localization pattern to that of full-length hNUDC in Cos-1 cells. Adenovirus-mediated overexpression of hNUDC or its N-terminal 159 residues in a human megakaryocyte cell line (Dami) resulted in increased levels of hNUDC or hNUDC(1-159) secretion. In contrast, depletion of Mpl by transfecting Dami cells with adenovirus bearing Mpl-targeting siRNA significantly blocked hNUDC secretion. Thus, we provide the first evidence that the N-terminal region of hNUDC contains all of the necessary information to complex with Mpl and traffic through the secretory pathway.
Related Links	http://dx.doi.org/10.1371/journal.pone.0051849
Starting Page	51849
File Format	PDF
ISSN	19326203
e-ISSN	19326203
Journal	PLoS ONE
Issue Number	12
Volume Number	7
Language	English
Publisher	Public Library of Science
Publisher Date	2012-12-01
Access Restriction	Open
Rights Holder	Public Library of Science
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Agricultural and Biological Sciences(all) Medicine(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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