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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(10
): 5326-41
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Transmembrane Protein 184A Is a Receptor Required for Vascular Smooth Muscle Cell
Responses to Heparin
#MMPMID26769966
Pugh RJ
; Slee JB
; Farwell SL
; Li Y
; Barthol T
; Patton WA
; Lowe-Krentz LJ
J Biol Chem
2016[Mar]; 291
(10
): 5326-41
PMID26769966
show ga
Vascular cell responses to exogenous heparin have been documented to include
decreased vascular smooth muscle cell proliferation following decreased ERK
pathway signaling. However, the molecular mechanism(s) by which heparin interacts
with cells to induce those responses has remained unclear. Previously
characterized monoclonal antibodies that block heparin binding to vascular cells
have been found to mimic heparin effects. In this study, those antibodies were
employed to isolate a heparin binding protein. MALDI mass spectrometry data
provide evidence that the protein isolated is transmembrane protein 184A
(TMEM184A). Commercial antibodies against three separate regions of the TMEM184A
human protein were used to identify the TMEM184A protein in vascular smooth
muscle cells and endothelial cells. A GFP-TMEM184A construct was employed to
determine colocalization with heparin after endocytosis. Knockdown of TMEM184A
eliminated the physiological responses to heparin, including effects on ERK
pathway activity and BrdU incorporation. Isolated GFP-TMEM184A binds heparin, and
overexpression results in additional heparin uptake. Together, these data support
the identification of TMEM184A as a heparin receptor in vascular cells.