| First Author | Xu Y | Year | 2018 |
| Journal | Nat Commun | Volume | 9 |
| Issue | 1 | Pages | 914 |
| PubMed ID | 29500416 | Mgi Jnum | J:259706 |
| Mgi Id | MGI:6149236 | Doi | 10.1038/s41467-018-03307-8 |
| Citation | Xu Y, et al. (2018) Sipa1 deficiency unleashes a host-immune mechanism eradicating chronic myelogenous leukemia-initiating cells. Nat Commun 9(1):914 |
| abstractText | Chronic myelogenous leukemia (CML) caused by hematopoietic stem cells expressing the Bcr-Abl fusion gene may be controlled by Bcr-Abl tyrosine kinase inhibitors (TKIs). However, CML-initiating cells are resistant to TKIs and may persist as minimal residual disease. We demonstrate that mice deficient in Sipa1, which encodes Rap1 GTPase-activating protein, rarely develop CML upon transfer of primary hematopoietic progenitor cells (HPCs) expressing Bcr-Abl, which cause lethal CML disease in wild-type mice. Resistance requires both T cells and nonhematopoietic cells. Sipa1(-/-) mesenchymal stroma cells (MSCs) show enhanced activation and directed migration to Bcr-Abl(+) cells in tumor tissue and preferentially produce Cxcl9, which in turn recruits Sipa1(-/-) memory T cells that have markedly augmented chemotactic activity. Thus, Sipa1 deficiency uncovers a host immune mechanism potentially capable of eradicating Bcr-Abl(+) HPCs via coordinated interplay between MSCs and immune T cells, which may provide a clue for radical control of human CML. |
