Open AccessStromal SPOCK 1 supports invasive pancreatic cancer growth
Author(s) -
Veenstra Veronique L.,
Damhofer Helene,
Waasdorp Cynthia,
Steins Anne,
Kocher Hemant M.,
Medema Jan P.,
Laarhoven Hanneke W.,
Bijlsma Maarten F
Publication year - 2017
Publication title -
molecular oncology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.332
H-Index - 88
eISSN - 1878-0261
pISSN - 1574-7891
DOI - 10.1002/1878-0261.12073
Subject(s) - stromal cell , stroma , extracellular matrix , cancer research , pancreatic cancer , tumor microenvironment , biology , cancer associated fibroblasts , cancer , tumor progression , microbiology and biotechnology , immunology , immunohistochemistry , tumor cells , genetics
Pancreatic ductal adenocarcinoma ( PDAC ) is marked by an abundant stromal deposition. This stroma is suspected to harbor both tumor‐promoting and tumor‐suppressing properties. This is underscored by the disappointing results of stroma targeting in clinical studies. Given the complexity of tumor–stroma interaction in PDAC , there is a need to identify the stromal proteins that are predominantly tumor‐promoting. One possible candidate is SPOCK 1 that we previously identified in a screening effort in PDAC . We extensively mined PDAC gene expression datasets, and used species‐specific transcript analysis in mixed‐species models for PDAC to study the patterns and driver mechanisms of SPOCK 1 expression in PDAC . Advanced organotypic coculture models with primary patient‐derived tumor cells were used to further characterize the function of this protein. We found SPOCK 1 expression to be predominantly stromal. Expression of SPOCK 1 was associated with poor disease outcome. Coculture and ligand stimulation experiments revealed that SPOCK 1 is expressed in response to tumor cell‐derived transforming growth factor‐beta. Functional assessment in cocultures demonstrated that SPOCK 1 strongly affects the composition of the extracellular collagen matrix and by doing so, enables invasive tumor cell growth in PDAC . By defining the expression pattern and functional properties of SPOCK 1 in pancreatic cancer, we have identified a stromal mediator of extracellular matrix remodeling that indirectly affects the aggressive behavior of PDAC cells. The recognition that stromal proteins actively contribute to the protumorigenic remodeling of the tumor microenvironment should aid the design of future clinical studies to target specific stromal targets.