Dataset Information

?-Catenin in desmoid-type fibromatosis: deep insights into the role of T41A and S45F mutations on protein structure and gene expression.

ABSTRACT: Desmoid-type fibromatosis (DF) is a rare mesenchymal lesion with high risk of local recurrence. Specific ?-catenin mutations (S45F) appeared to be related to this higher risk compared to T41A-mutated or wild-type (WT). We explored the influence of both mutations and WT on structure stability and affinity of ?-catenin for ?-catenin and the pattern of gene expression that may influence DF behavior. Using 33 surgically resected primary DFs harboring T41A (n = 14), S45F (n = 10), or WT (n = 9), we performed a comparative molecular analysis by protein/protein interaction modeling, gene expression by DASL microarrays, human inflammation gene panel, and assessment of immune system-based biomarkers by immunohistochemistry. Mutated proteins were more stable than WT and formed a weaker complex with ?-catenin. Consensus unsupervised gene clustering revealed the presence of two DF group-mutated (T41A + S45F) and WT (P = 0.0047). The gene sets 'Inflammatory-Defense-Humoral Immune Response' and 'Antigen Binding' were significantly enriched in T41A. The deregulation of 16 inflammation-related genes was confirmed. Low numbers of T cells and tumor-associated macrophages (TAM) infiltrating the tumors and low/absent PD-1/PD-L1 expression were also identified. We demonstrated that mutated DFs (T41A or S45F) and WT are two distinct molecular subgroups with regard to ?-catenin stability, ?-catenin affinity, and gene expression profiling. A different inflammation signature characterized the two mutated groups, suggesting mediation either by T41A or by S45F. Finally, all mutated cases showed a low number of TIL and TAM cells and a low or absent expression of PD-1 and PD-L1 consistent with ?-catenin activation insensitive to checkpoint blockade.

SUBMITTER: Colombo C

PROVIDER: S-EPMC5664003 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Publications

β-Catenin in desmoid-type fibromatosis: deep insights into the role of T41A and S45F mutations on protein structure and gene expression.

Colombo Chiara C Belfiore Antonino A Paielli Nicholas N De Cecco Loris L Canevari Silvana S Laurini Erik E Fermeglia Maurizio M Pricl Sabrina S Verderio Paolo P Bottelli Stefano S Fiore Marco M Stacchiotti Silvia S Palassini Elena E Gronchi Alessandro A Pilotti Silvana S Perrone Federica F

Molecular oncology 20170929 11

Desmoid-type fibromatosis (DF) is a rare mesenchymal lesion with high risk of local recurrence. Specific β-catenin mutations (S45F) appeared to be related to this higher risk compared to T41A-mutated or wild-type (WT). We explored the influence of both mutations and WT on structure stability and affinity of β-catenin for α-catenin and the pattern of gene expression that may influence DF behavior. Using 33 surgically resected primary DFs harboring T41A (n = 14), S45F (n = 10), or WT (n = 9), we p ...[more]

PMID: 28627792

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Project description:Desmoid fibromatosis is a rare but locally aggressive tumor comprised of myofibroblasts. Desmoids do not have the ability to metastasize but can cause significant morbidity and mortality by local invasion. These tumors may occur throughout the body, but are commonly found on the abdominal wall and within the intestinal mesentery. Desmoids in these areas may cause unique clinical problems for physicians and patients. Mutations in either the β-catenin or the APC genes are usually the cause for the development of these tumors with the former comprising the sporadic development of tumors and the latter being associated with familial adenomatous polyposis syndrome. Surgical resection with histologically negative margins has been the cornerstone of therapy for this disease, but this paradigm has begun to shift. It is now common to accept a microscopically positive margin after resection as recurrence rates may not be significantly affected. An even more radical evolution in management has been the recent movement towards "watchful waiting" when new desmoids are diagnosed. As the natural history of desmoids has become better understood, it is evident that some tumors will not grow and may even spontaneously regress sparing patients the morbidity of more aggressive therapy. Other modalities of treatment for desmoids include radiation and systemic therapy which both can be used adjuvantly or as definitive therapy and have shown durable response rates as single therapy regimens. The decision to use radiation and/or systemic therapies is often based on tumor biology, tumor location, surgical morbidity, and patient preference. Systemic therapy options have increased to include hormonal therapies, non-steroidal anti-inflammatory drugs and chemotherapy, as well as targeted therapies. Unfortunately, the rarity of this disease has resulted in a scarcity of randomized trials to evaluate any of these therapies emphasizing the need for this disease to be treated at high volume multidisciplinary institutions.

Dataset Information

?-Catenin in desmoid-type fibromatosis: deep insights into the role of T41A and S45F mutations on protein structure and gene expression.

Publications

β-Catenin in desmoid-type fibromatosis: deep insights into the role of T41A and S45F mutations on protein structure and gene expression.

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