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Prognostic Value of NLRP3 Inflammasome and TLR4

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ORIGINAL RESEARCH published: 02 September 2021 doi: 10.3389/fonc.2021.705331 Prognostic Value of NLRP3 Inflammasome and TLR4 Expression in Breast Cancer Patients † † Concetta Saponaro 1* , Emanuela Scarpi 2 , Margherita Sonnessa 1, Antonella Cioffi 1, Francesca Buccino 3, Francesco Giotta 4, Maria Irene Pastena 3, ‡ ‡ Francesco Alfredo Zito 3 and Anita Mangia 1* 1 Functional Biomorphology Laboratory, IRCCS Istituto Tumori “Giovanni Paolo II”, Bari, Italy, 2 Unit of Biostatistics and Clinical Trials, IRCCS Istituto Scientifico Romagnolo per lo Studio dei Tumori (IRST) “Dino Amadori”, Meldola (FC), Italy, 3 Pathology Department, IRCCS Istituto Tumori “Giovanni Paolo II”, Bari, Italy, 4 Medical Oncology Unit, IRCCS-Istituto Tumori “Giovanni Paolo II”, Bari, Italy Edited by: Nicola Silvestris, University of Bari Aldo Moro, Italy Inflammasome complexes play a pivotal role in different cancer types. NOD-like receptor Reviewed by: protein 3 (NLRP3) inflammasome is one of the most well-studied inflammasomes. Stan Lipkowitz, Activation of the NLRP3 inflammasome induces abnormal secretion of soluble National Cancer Institute, fl United States cytokines, generating advantageous in ammatory surroundings that support tumor Elena Gershtein, growth. The expression levels of the NLRP3, PYCARD and TLR4 were determined by Russian Cancer Research Center NN immunohistochemistry in a cohort of primary invasive breast carcinomas (BCs). We Blokhin, Russia *Correspondence: observed different NLRP3 and PYCARD expressions in non-tumor vs tumor areas Anita Mangia (p<0.0001). All the proteins were associated to more aggressive clinicopathological [email protected] characteristics (tumor size, grade, tumor proliferative activity etc.). Univariate analyses Concetta Saponaro [email protected] were carried out and related Kaplan-Meier curves plotted for NLRP3, PYCARD and TLR4 †These authors contributed have expression. Patients with higher NLRP3 and TLR4 expression had worse 5-year disease- equally to this work and free survival (DFS) compared to patients with lower NLRP3 and TLR4 expression fi share rst authorship (p =0.021 and p = 0.009, respectively). In multivariate analysis, TLR4 was confirmed as ‡ These authors contributed have independent prognostic factors for DFS (HR = 2.03, 95% CI 1.16–3.57, p = 0.014), and equally to this work and share last authorship high NLRP3 expression showed a slight association with DFS (HR = 1.75, 95% CI 0.98– 3.15, p = 0.06). In conclusion, we showed TLR4 expression as independent prognostic Specialty section: factors and we highlighted for the first time that high expression of NLRP3 is linked to a This article was submitted to Breast Cancer, poor prognosis in BC patients. These results suggest that NLRP3 and TLR4 could be two a section of the journal new good prognostic factor for BC patients. Frontiers in Oncology Keywords: NLRP3 inflammasome, breast cancer, prognostic biomarker, PYCARD, TLR4 Received: 05 May 2021 Accepted: 17 August 2021 Published: 02 September 2021 Citation: INTRODUCTION Saponaro C, Scarpi E, Sonnessa M, Cioffi A, Buccino F, Giotta F, The tumor microenvironment (TME) is the result of a multistep process characterized by Pastena MI, Zito FA and Mangia A reprogramming across cellular components. Different critical oncogenic processes contribute to (2021) Prognostic Value of NLRP3 fl changing the TME, such as angiogenesis, invasion/metastasis, drug resistance and chronic In ammasome and TLR4 Expression fl fl in Breast Cancer Patients. in ammation (1). Uncontrolled chronic in ammation has been shown to play a pivotal role in Front. Oncol. 11:705331. the onset and development of cancer via the up-regulation of growth factors, free radicals, doi: 10.3389/fonc.2021.705331 prostaglandins and pro-inflammatory cytokines [interleukin (IL)-1b and IL-18] (2, 3). Tumor Frontiers in Oncology | www.frontiersin.org 1 September 2021 | Volume 11 | Article 705331 Saponaro et al. NLRP3 Inflammasome in Breast Cancer cells can also produce inflammatory mediators as well as “Giovanni Paolo II” of Bari, Italy was studied. The patients fibroblasts, immune and endothelial cells (4). The were selected based on the availability of biological material and inflammatory microenvironment can contribute to enhancing their clinical follow-up. Patients were eligible if they had a mutational state and mutated cell proliferation. However, the histological diagnosis of invasive breast carcinoma of any size triggers and molecular signaling implicated in the inflammatory and no evidence of metastatic disease at diagnosis. The study was state are still poorly characterized. approved by the Ethics Committee of the Istituto Tumori The production of inflammatory interleukins is mediated by “Giovanni Paolo II” with document no. 234/CE of 13 inflammasome activation. Inflammasomes are cytosolic November 2017. Table 1 summarizes the clinicopathological multiprotein oligomers involved in the inflammatory state. characteristics of the entire cohort. One hundred and one They typically comprise a sensor of a NOD-like receptor (31.7%) were triple negative breast cancers (TNBCs). Median protein (NLRP), the adaptor molecule apoptosis-associated age was 53 years (IQR=interquartile range 46-63) and median speck-like protein containing a CARD (ASC) and a pro- follow-up was 67 months (range 1-199). Sixty patients (17%) had caspase (5). Inflammasomes are activated by different stimuli a relapse. The tumor, node, metastasis (TNM) classification, mediated by diverse Pathogen Recognition Receptors (PRRs), tumor size, histological grade, estrogen receptor (ER) status, including Toll-like receptors (TLRs), NOD-like receptor (NLRs), progesterone receptor (PR) status, proliferative activity (Ki67 and Absent in melanoma-like receptors (ALR) (6). TLRs and expression and human epidermal growth factor receptor 2 NLRPs are intercellular receptors that are able to identify stimuli (HER2) status were provided by the Pathology Department of called pathogen-associated molecular patterns (PAMPs) and our Institute. The immunohistochemical assessment of ER danger-associated molecular patterns (DAMPs) (7, 8). status, PR status and Ki67 expression has been previously Inflammasome components are involved in different reported (22). Cases scoring 0 and 1+ were classified as negative. physiological and pathological conditions, and their contribution HER2 was considered to be positive if immunostaining was 3+ or in different cancers has been highlighted in the past few years (9– if a score of 2+ showed gene amplification by fluorescence in situ 12). The role of inflammasomes in cancer is dual. On the one hand, hybridization (FISH), according to the 2007 ASCO/CAP guideline inflammasome activation accelerates tumor progression by for BC (23). enhancing cancer stem cells, myeloid-derived suppressor cells (MDSCs), metastasis, epithelial mesenchymal transition (EMT) Tissue Microarrays and and angiogenesis and inhibiting apoptosis (13, 14). This behavior Immunohistochemistry makes inflammasomes the perfect structure bridging chronic Tissue microarrays (TMAs) were prepared, and immunohistochemistry inflammation, carcinogenesis and tumor progression. On the (IHC) was performed as previously reported. Briefly, TMAs were other hand, inflammasomes can constrain tumor cell survival by assembledfromformalin-fixed and paraffin-embedded (FFPE) supporting tumor suppressors and immune response and tumor tissues using the Galileo Tissue MicroArrayer CK 4500 promoting cell death by pyroptosis (9, 15, 16). However, (Transgenomic, Hillington Park, Glasgow, UK). Each sample was inflammasomes are not the only complex with a dual role and the arrayed in triplicate to minimize tissue loss and to overcome TME, tissue type and cell type are also involved in determining tumor heterogeneity. Consecutive sections of 4-µm thickness oncogene and onco-suppressor behavior. were cut from formalin-fixed and paraffin-embedded histological The NLRP3 inflammasome is the most well-studied material and stained with an indirect immunoperoxidase method inflammasome involved in cancer development. Its role in using the BenchMark XT automated staining instrument breast cancer (BC) is becoming clearer, but several aspects (Ventana Medical Systems, Tucson, AZ, USA), as previously have yet to be analyzed. Recent papers have associated NLRP3 reported (24). Deparaffinization was performed with EZ PREP activation and IL-1b secretion to tumor growth, invasiveness, solution, followed by antigen retrieval with Cell Conditioning relapse and progression (13, 17–19). An association has also been solution 1 at 95° for NLRP3 (32 min) and TLR4 (60 min), and Cell reported between levels of TLR expression and high recurrence Conditioning solution 2 at 95°C for PYCARD (32 min). The slides rates in BC patients (20), and high messenger RNA (mRNA) were then incubated at 37° for 1h with the specific primary levels of TLR3, TLR4, and TLR9 have been observed in BC (21). antibody as reported in Table S1. The OptiView DAB IHC The aim of our study has been to clarify the role of some Detection Kit and OptiView Amplification Kit (Ventana proteins of the NLRP3 inflammasome platform in a cohort of Medical Systems, Tucson, AZ, USA) were used to detect NLRP3 women with primary invasive BC and identify new potential and PYCARD protein expression. The UltraView Universal DAB prognostic biomarkers to determine a sub-group of patients who detection kit (Ventana Medical Systems, Tucson, AZ, USA) was may benefit from specific treatments. used to detect TLR4 protein expression. Finally,
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