Title : A requirement for membrane cholesterol in the beta-arrestin- and clathrin-dependent endocytosis of LPA1 lysophosphatidic acid receptors.

Pub. Date : 2005 Nov 15

PMID : 16263766






16 Functional Relationships(s)
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1 A requirement for membrane cholesterol in the beta-arrestin- and clathrin-dependent endocytosis of LPA1 lysophosphatidic acid receptors. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
2 Lysophosphatidic acid (LPA) stimulates heterotrimeric G protein signaling by activating three closely related receptors, termed LPA(1), LPA(2) and LPA(3). lysophosphatidic acid lysophosphatidic acid receptor 1 Mus musculus
3 Lysophosphatidic acid (LPA) stimulates heterotrimeric G protein signaling by activating three closely related receptors, termed LPA(1), LPA(2) and LPA(3). lysophosphatidic acid lysophosphatidic acid receptor 1 Mus musculus
4 Here we show that in addition to promoting LPA(1) signaling, membrane cholesterol is essential for the association of LPA(1) with beta-arrestin, which leads to signal attenuation and clathrin-dependent endocytosis of LPA(1). Cholesterol lysophosphatidic acid receptor 1 Mus musculus
5 Here we show that in addition to promoting LPA(1) signaling, membrane cholesterol is essential for the association of LPA(1) with beta-arrestin, which leads to signal attenuation and clathrin-dependent endocytosis of LPA(1). Cholesterol lysophosphatidic acid receptor 1 Mus musculus
6 LPA(1) endocytosis was also inhibited in beta-arrestin 1 and 2-null mouse embryo fibroblasts (beta-arrestin 1/2 KO MEFs), but was restored upon re-expression of wild-type beta-arrestin 2. beta-arrestin attenuates LPA signaling as LPA(1)-dependent phosphoinositide hydrolysis was significantly elevated in beta-arrestin 1/2 KO MEFs and was reduced to wild-type levels upon re-expression of wild-type beta-arrestin. lysophosphatidic acid lysophosphatidic acid receptor 1 Mus musculus
7 Interestingly, extraction of membrane cholesterol with methyl-beta-cyclodextrin inhibited LPA(1) signaling, beta-arrestin membrane recruitment and LPA(1) endocytosis. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
8 Interestingly, extraction of membrane cholesterol with methyl-beta-cyclodextrin inhibited LPA(1) signaling, beta-arrestin membrane recruitment and LPA(1) endocytosis. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
9 Interestingly, extraction of membrane cholesterol with methyl-beta-cyclodextrin inhibited LPA(1) signaling, beta-arrestin membrane recruitment and LPA(1) endocytosis. methyl-beta-cyclodextrin lysophosphatidic acid receptor 1 Mus musculus
10 Interestingly, extraction of membrane cholesterol with methyl-beta-cyclodextrin inhibited LPA(1) signaling, beta-arrestin membrane recruitment and LPA(1) endocytosis. methyl-beta-cyclodextrin lysophosphatidic acid receptor 1 Mus musculus
11 LPA treatment increased the detergent resistance of LPA(1) and this was inhibited by cholesterol extraction, suggesting that LPA(1) localizes to detergent-resistant membranes upon ligand stimulation. lysophosphatidic acid lysophosphatidic acid receptor 1 Mus musculus
12 LPA treatment increased the detergent resistance of LPA(1) and this was inhibited by cholesterol extraction, suggesting that LPA(1) localizes to detergent-resistant membranes upon ligand stimulation. lysophosphatidic acid lysophosphatidic acid receptor 1 Mus musculus
13 LPA treatment increased the detergent resistance of LPA(1) and this was inhibited by cholesterol extraction, suggesting that LPA(1) localizes to detergent-resistant membranes upon ligand stimulation. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
14 LPA treatment increased the detergent resistance of LPA(1) and this was inhibited by cholesterol extraction, suggesting that LPA(1) localizes to detergent-resistant membranes upon ligand stimulation. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
15 These data indicate that although LPA(1) is internalized by clathrin- and beta-arrestin dependent endocytosis, membrane cholesterol is critical for LPA(1) signaling, membrane recruitment of beta-arrestins and LPA(1) endocytosis. Cholesterol lysophosphatidic acid receptor 1 Mus musculus
16 These data indicate that although LPA(1) is internalized by clathrin- and beta-arrestin dependent endocytosis, membrane cholesterol is critical for LPA(1) signaling, membrane recruitment of beta-arrestins and LPA(1) endocytosis. Cholesterol lysophosphatidic acid receptor 1 Mus musculus