Protein Ligands in the Secretome of CD36+ Fibroblasts Induce Growth Suppression in a Subset of Breast Cancer Cell Lines

被引:11
作者
Jabbari, Kosar [1 ]
Winkelmaier, Garrett [1 ]
Andersen, Cody [1 ]
Yaswen, Paul [1 ]
Quilici, David [2 ]
Furuta, Saori [3 ]
Cheng, Qingsu [1 ]
Parvin, Bahram [1 ,4 ,5 ]
机构
[1] Univ Nevada, Dept Biomed Engn, Reno, NV 89557 USA
[2] Univ Nevada, Nevada Prote Ctr, Reno, NV 89557 USA
[3] Univ Toledo, Dept Canc Biol, Toledo, OH 43614 USA
[4] Univ Nevada, Dept Cell & Mol Biol, Reno, NV 89557 USA
[5] Renown Canc Ctr, Reno, NV 89502 USA
关键词
CD36(+) fibroblasts; conditioned medium; breast cancer cells; 3D colonies; proteomics profiling; ACTIVIN-A; EXPRESSION; SLIT3; PROENKEPHALIN; REPRESSION; FIBULIN-1; REVERSION; DENSITY; MODELS; RISK;
D O I
10.3390/cancers13184521
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Simple Summary Human breast cancers are not fully autonomous. They are dependent on nutrients and growth-promoting signals provided by stromal cells. In order to instruct the surrounding cells to provide essential growth factors, cancer cells co-opt normal signaling molecules and mechanisms. To inhibit or potentially reverse tumor growth, our goal is to emulate this signaling and reprogram the microenvironment. For example, in a healthy mammary gland, fibroblasts (FBs) overexpress CD36; and the downregulation of CD36 is one of the hallmarks of cancer-associated FBs. Therefore, in this project, we hypothesized that signaling from CD36(+) FBs could cause growth suppression in a subset of breast cancer cell lines. We then designed a series of experiments to validate this growth suppression and identified responsible secreted factors by the CD36(+) FBs. These experiments suggested that three protein ligands are primarily responsible for growth suppression in a subset of breast cancer cell lines. Reprogramming the tumor stroma is an emerging approach to circumventing the challenges of conventional cancer therapies. This strategy, however, is hampered by the lack of a specific molecular target. We previously reported that stromal fibroblasts (FBs) with high expression of CD36 could be utilized for this purpose. These studies are now expanded to identify the secreted factors responsible for tumor suppression. Methodologies included 3D colonies, fluorescent microscopy coupled with quantitative techniques, proteomics profiling, and bioinformatics analysis. The results indicated that the conditioned medium (CM) of the CD36(+) FBs caused growth suppression via apoptosis in the triple-negative cell lines of MDA-MB-231, BT549, and Hs578T, but not in the ERBB2(+) SKBR3. Following the proteomics and bioinformatic analysis of the CM of CD36(+) versus CD36(-) FBs, we determined KLF10 as one of the transcription factors responsible for growth suppression. We also identified FBLN1, SLIT3, and PENK as active ligands, where their minimum effective concentrations were determined. Finally, in MDA-MB-231, we showed that a mixture of FBLN1, SLIT3, and PENK could induce an amount of growth suppression similar to the CM of CD36(+) FBs. In conclusion, our findings suggest that these ligands, secreted by CD36(+) FBs, can be targeted for breast cancer treatment.
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页数:22
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