| First Author | Saaber F | Year | 2019 |
| Journal | Cell Rep | Volume | 26 |
| Issue | 6 | Pages | 1473-1488.e9 |
| PubMed ID | 30726732 | Mgi Jnum | J:275611 |
| Mgi Id | MGI:6307680 | Doi | 10.1016/j.celrep.2019.01.049 |
| Citation | Saaber F, et al. (2019) ACKR3 Regulation of Neuronal Migration Requires ACKR3 Phosphorylation, but Not beta-Arrestin. Cell Rep 26(6):1473-1488.e9 |
| abstractText | Phosphorylation of heptahelical receptors is thought to regulate G protein signaling, receptor endocytosis, and non-canonical signaling via recruitment of beta-arrestins. We investigated chemokine receptor functionality under phosphorylation-deficient and beta-arrestin-deficient conditions by studying interneuron migration in the embryonic cortex. This process depends on CXCL12, CXCR4, G protein signaling and on the atypical CXCL12 receptor ACKR3. We found that phosphorylation was crucial, whereas beta-arrestins were dispensable for ACKR3-mediated control of CXCL12 levels in vivo. Cortices of mice expressing phosphorylation-deficient ACKR3 exhibited a major interneuron migration defect, which was accompanied by excessive activation and loss of CXCR4. Cxcl12-overexpressing mice mimicked this phenotype. Excess CXCL12 caused lysosomal CXCR4 degradation, loss of CXCR4 responsiveness, and, ultimately, similar motility defects as Cxcl12 deficiency. By contrast, beta-arrestin deficiency caused only a subtle migration defect mimicked by CXCR4 gain of function. These findings demonstrate that phosphorylation regulates atypical chemokine receptor function without beta-arrestin involvement in chemokine sequestration and non-canonical signaling. |
