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Interleukin-32 in Systemic Sclerosis, a Potential New Biomarker for Pulmonary Arterial Hypertension

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Interleukin-32 in Systemic Sclerosis, a Potential New Biomarker for Pulmonary Arterial Hypertension Di Benedetto et al. Arthritis Research & Therapy (2020) 22:127 https://doi.org/10.1186/s13075-020-02218-8 RESEARCH ARTICLE Open Access Interleukin-32 in systemic sclerosis, a potential new biomarker for pulmonary arterial hypertension Paola Di Benedetto1†, Giuliana Guggino2†, Giovanna Manzi3, Piero Ruscitti4, Onorina Berardicurti4, Noemi Panzera1, Nicolò Grazia1, Roberto Badagliacca3, Valeria Riccieri5, Carmine Dario Vizza3, Ganna Radchenko6, Vasiliki Liakouli7, Francesco Ciccia7, Paola Cipriani4† and Roberto Giacomelli4*† Abstract Background: Pulmonary arterial hypertension (PAH) is a severe complication of systemic sclerosis (SSc), associated with a progressive elevation in pulmonary vascular resistance and subsequent right heart failure and death. Due to unspecific symptoms, the diagnosis of PAH is often delayed. On this basis, it is of great value to improve current diagnostic methods and develop new strategies for evaluating patients with suspected PAH. Interleukin-32 (IL-32) is a proinflammatory cytokine expressed in damaged vascular cells, and the present study aimed to assess if this cytokine could be a new biomarker of PAH during SSc. Methods: The IL-32 expression was evaluated in the sera and skin samples of 18 SSc-PAH patients, 21 SSc patients without PAH, 15 patients with idiopathic PAH (iPAH) and 14 healthy controls (HCs), by enzyme-linked immunosorbent assay (ELISA) and immunohistochemistry (IHC). Receiver-operating characteristic (ROC) curves were performed to evaluate the cut-off of IL-32 in identifying patients with PAH. Furthermore, in SSc patients, correlation analyses were performed between IL-32 sera levels and mean pulmonary artery pressure (mPAP) evaluated by right heart catheterization (RHC) and systolic pulmonary artery pressure (sPAP), obtained by echocardiography. Additionally, the number of skin IL-32+ cells was correlated with modified Rodnan skin score (mRSS). Results: In SSc-PAH patients, IL-32 sera levels were significantly higher when compared with SSc patients without PAH and patients affected by iPAH. The analysis of ROC curve showed that IL-32 sera levels above 11.12 pg/ml were able to predict patients with PAH (sensitivity = 90%, specificity = 100%). Furthermore, the IL-32 sera levels of patients with SSc correlated with both mPAP and sPAP. In the skin derived from SSc-PAH patients, the number of IL-32+ cells was significantly increased when compared with the skin derived from SSc patients without PAH, correlating with the mRSS. Conclusion: Our study suggested that sera determination of IL-32 may be a promising approach to evaluate the presence of PAH in SSc patients and together with longitudinal future studies could help to increase the understanding how these biomarkers mirror the vascular changes and the inflammatory process during SSc. Keywords: Systemic sclerosis, Pulmonary arterial hypertension, IL-32 * Correspondence: [email protected] †Paola Di Benedetto, Giuliana Guggino, Paola Cipriani and Roberto Giacomelli contributed equally to this work. 4Division of Rheumatology, Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, L’Aquila, Italy Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Di Benedetto et al. Arthritis Research & Therapy (2020) 22:127 Page 2 of 9 Background arteritis patients [29, 30], acting as a “danger signal/alar- Systemic sclerosis (SSc) is a systemic autoimmune dis- min” molecule. The EC production of IL-32 is enhanced ease characterised by microvascular damage and pro- by various inflammatory stimuli, such as IL-1b, IL-1a, gressive fibrotic manifestations of the skin and internal IL-6, and IL-8, and among them IL-1 and IL-8 are po- organs [1–4], classified in two different subsets, display- tent promoters of angiogenesis [24, 31]. Of interest, IL- ing different clinical patterns and outcomes: limited 32 has been identified in the abnormal ECs, populating cutaneous (lcSSc) and diffuse cutaneous (dcSSc). Cardio- the plexiform lesions in the lungs of patients with iPAH pulmonary involvement is the most common cause of [25], and probably involved in both activation and prolif- morbidity and mortality in those patients [5]. According eration of these ECs. Increased IL-32 levels have been to the last clinical classification of pulmonary arterial found associated with [25, 32, 33] activity and/or severity hypertension (PAH), pulmonary hypertension can occur of Behcet’s disease [34], systemic lupus erythematosus due to pure vascular involvement (WHO Group 1), sec- and atopic dermatitis [35, 36]. Presently, the role of IL- ondary to SSc-interstitial lung disease (WHO Group 2) 32 in SSc is still unknown; thus, we assessed the expres- and secondary to cardiac involvement (post-capillary sion of IL-32 in the sera of SSc patients with PAH pulmonary hypertension, WHO Group 3) in those pa- (WHO Group 1) and compared these values with those tients [6]. Isolated PAH (in the absence of lung fibrosis) from SSc patients without PH and patients with iPAH. is one of the more severe complications of SSc, associ- In addition, we correlated the IL-32 sera levels with the ated with a very high mortality rate, [7]. It has been re- mean pulmonary artery pressure (mPAP) assessed by ported that the 1-year survival rates for SSc-PAH RHC and the values of systolic pulmonary artery patients range from 50 to 81% [8], having about a three- pressure (sPAP), obtained by echocardiography, to fold increase in the mortality risk when compared with understand if IL-32 may be considered an additional iPAH [9]. Thus, an early diagnosis is essential, because non-invasive screening tool for SSc patients with signs the late referral to cardiologists, when the symptoms of and symptoms of PAH. right heart dysfunction are already present, predicts a The pathogenic mechanisms of experimental PAH worse survival [10, 11]. However, early and accurate largely mirror what described in SSc vascular defects diagnosis of PAH is a clinical challenge, needing right [17, 19–22], and on these bases, we searched for IL-32 heart catheterization (RHC), an invasive test which have expression in the skin samples of our SSc patients. to be performed in those patients at increased risk of Finally, we correlated the number of IL-32+ cells in the PAH, following echocardiographic results and additional affected skin with the modified Rodnan skin score criteria [12–14]. In this context, the availability of suit- (mRSS), a surrogate for disease activity, severity and able diagnostic biomarkers for an early identification of mortality in patients with dcSSc [37]. SSc-PAH patients, still in asymptomatic phase, may sig- nificantly impact patient’s survival. A large number of Materials and methods circulating biomarkers have been investigated in the last Patients and controls years, but so far, only B-type natriuretic peptide (BNP) Eighteen SSc patients with WHO group 1 PAH [6], con- and N-terminal proBNP (NT-proBNP) are routinely secutively selected during the diagnostic RHC, and 21 used in the clinical setting, since being associated with patients with SSc [38] without PAH, selected among the severity of heart involvement [15, 16]. those patients consecutively admitted in our outpatient It is well known that pulmonary arteries display clinics, who underwent sPAP evaluation, showing a nor- complex structural and functional changes during PAH mal sPAP associated with no sign or symptom referred and pulmonary endothelial cells’ (ECs) dysfunction plays to heart involvement, in the context of their routinely a crucial role in disease progression, leading to vascular clinical assessment, were enrolled for this cross-sectional defects observed in SSc patients [17–22]. Hyper- study. All patients fulfilled the 2013 classification criteria proliferative ECs may contribute to pulmonary arterial for SSc [39]. The diagnosis of PAH was confirmed ac- remodelling, leading to the obliteration of vascular cording to the European guidelines [14]. Fifteen patients lumen [23]. IL-32, a proinflammatory cytokine, originally with iPAH and 14 HCs were also evaluated as controls. described as a transcript termed NK4, is considered a For this study, sera of the SSc-PAH patients and sera of key regulator molecule of EC activities [24, 25]. Al- iPAH patients, collected at the time of diagnostic RHC, though 9 different isoforms are described according to were matched with the sera of SSc patients without varying mRNA splicing
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