Publication date: Available online 25 May 2017
Source:Experimental Cell Research
Author(s): Shin Morioka, Kiyomi Nigorikawa, Kaoru Hazeki, Michiko Ohmura, Hiromi Sakamoto, Takuma Matsumura, Shunsuke Takasuga, Osamu Hazeki
The findings of this study suggest that the phosphoinositide phosphatase Sac3 maintains the protein level of scavenger receptor A (SR-A) and regulates foam cell formation. RAW264.7 macrophages were transfected with short hairpin RNAs that target Sac3. The knockdown decreased the level of the cell surface SR-A and suppressed the acetylated low density lipoprotein-induced foam cell formation. The associated regulator of PIKfyve (ArPIKfyve) is a scaffold protein that protects Sac3 from proteasome-dependent degradation. The knockdown of ArPIKfyve decreased Sac3, cell surface SR-A, and foam cell formation. The knockdown of PIKfyve had no effect on SR-A protein levels. These results suggest that the ArPIKfyve-Sac3 complex regulates SR-A protein levels independently of its effect on PIKfyve activity.
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