| General information | Literature | Expression | Regulation | Mutation | Homolog | Interaction |
Basic Information | |
|---|---|
Gene ID | 84152 |
Name | PPP1R1B |
Synonymous | protein phosphatase 1, regulatory (inhibitor) subunit 1B;PPP1R1B;protein phosphatase 1, regulatory (inhibitor) subunit 1B |
Definition | dopamine and cAMP-regulated neuronal phosphoprotein 32|protein phosphatase 1 regulatory subunit 1B |
Position | 17q12 |
Gene type | protein-coding |
Title | Abstract |
| breast cancer | Cell migration plays a central role in processes such as development, wound healing and cancer metastasis. Here we describe a novel interaction between DDR1, a receptor tyrosine kinase activated by collagen, and the phosphoprotein DARPP-32 in mammary epithelial cells. DARPP-32 expression was readily detected in non-transformed mammary cell lines, but was strongly reduced or even absent in breast tumor cell lines, such as MCF7. Transfection of MCF7 cells with DARPP-32 resulted in severely impaired cell migration, while DARPP-32 transfection into the DDR1-deficient breast cancer cell line MDA-MB-231 did not alter migration. Co-expression of both DDR1 and DARPP-32 in MDA-MB-231 cells inhibited migration, thereby supporting a critical role of the DDR1/DARPP-32 complex in motility. mutational substitution of the phosphorylation sites Thr-34 or Thr-75 on DARPP-32 revealed that phosphorylation of Thr-34 is necessary for the ability of DARPP-32 to impair breast tumor cell migration. Thus, DARPP-32 signaling downstream of DDR1 is a potential new target for effective anti-metastatic breast cancer therapy. |