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Biophysical Journal
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Isoform-Specific Translocation of PKC in HEK293T Cells by Alpha1-Adrenergic Stimulation

Authors: Sorenson, Jaime; Ouchi, Jin; Williams, Kaleef; Lopes, Coeli;

Isoform-Specific Translocation of PKC in HEK293T Cells by Alpha1-Adrenergic Stimulation

Abstract

Protein kinase C (PKC), a multi-gene family of enzymes, plays key roles in the regulation of signal transduction and cellular function in various cell types. Intracellular localization and trafficking of these individual PKC isoforms are important for regulation of enzyme activity and substrate specificity. PKC can be activated at downstream of Gq-protein coupled receptor (GqPCR) signaling and recent reports suggested that different type of GqPCRs would activate different isoforms of PKC (classic, novel and atypical PKCs). However, the knowledge of isoform specific activation of PKC by GqPCRs is limited. αλπηα1-adrenergic receptor (αλπηα1-AR) is the one of the GqPCR strongly expressed in the heart, vascular system and urinary bladder. In this study, we examined the isoform-specific dynamic translocation of PKC in living HEK293T cells by αλπηα1-adrenergic stimulation. Rat PKCαλπηα, βeταI, βeταII, δeλτα, eπσιλoν and ζeτα were fused with GFP at C-term and were co-transfected with human αλπηα1-AR to HEK293T cells. The isoform-specific dynamic translocation of PKC in living HEK293T cells by αλπηα1-AR stimulation using phenylephrine were observed by confocal microscope. Before stimulation, GFP-PKCs were localized at cytosolic region. αλπηα1-AR stimulation strongly and rapidly translocated classical PKCαλπηα (< 30s) to the plasma membrane (PM), with PKCαλπηα diffusing back into the cytosol within 5 min. αλπηα1-AR stimulation rapidly translocated classical PKC βeταI and II to the PM (<30s), with sustained membrane localization. Novel PKCeπσιλoν, but not δeλτα were translocated by αλπηα1-AR stimulation to the PM (<30s) and its membrane localization was also sustained. αλπηα1-AR stimulation did not caused DAG-insensitive atypical PKCζeτα translocation. Our data suggests that PKCαλπηα, PKCβeτα and PKCeπσιλoν activation may underlie αλπηα1-AR function. Our data suggest that PKCβeτα and PKCeπσιλoν may be particular important during chronic αλπηα1-AR and cardiovascular disease.

Keywords

Biophysics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
hybrid