| First Author | Hammer AM | Year | 2017 |
| Journal | Neoplasia | Volume | 19 |
| Issue | 6 | Pages | 496-508 |
| PubMed ID | 28501760 | Mgi Jnum | J:318696 |
| Mgi Id | MGI:6844352 | Doi | 10.1016/j.neo.2017.04.004 |
| Citation | Hammer AM, et al. (2017) Stromal PDGFR-alpha Activation Enhances Matrix Stiffness, Impedes Mammary Ductal Development, and Accelerates Tumor Growth. Neoplasia 19(6):496-508 |
| abstractText | The extracellular matrix (ECM) is critical for mammary ductal development and differentiation, but how mammary fibroblasts regulate ECM remodeling remains to be elucidated. Herein, we used a mouse genetic model to activate platelet derived growth factor receptor-alpha (PDGFRalpha) specifically in the stroma. Hyperactivation of PDGFRalpha in the mammary stroma severely hindered pubertal mammary ductal morphogenesis, but did not interrupt the lobuloalveolar differentiation program. Increased stromal PDGFRalpha signaling induced mammary fat pad fibrosis with a corresponding increase in interstitial hyaluronic acid (HA) and collagen deposition. Mammary fibroblasts with PDGFRalpha hyperactivation also decreased hydraulic permeability of a collagen substrate in an in vitro microfluidic device assay, which was mitigated by inhibition of either PDGFRalpha or HA. Fibrosis seen in this model significantly increased the overall stiffness of the mammary gland as measured by atomic force microscopy. Further, mammary tumor cells injected orthotopically in the fat pads of mice with stromal activation of PDGFRalpha grew larger tumors compared to controls. Taken together, our data establish that aberrant stromal PDGFRalpha signaling disrupts ECM homeostasis during mammary gland development, resulting in increased mammary stiffness and increased potential for tumor growth. |
