Abstract
Periostin is a protein having two characteristics—an extracellular matrix (ECM) protein important for maintaining tissue or organ structures and in generating fibrosis by binding to other ECM proteins and a matricellular protein transducing intracellular signaling by binding to several integrins on the cell surface. IL-4 and IL-13, signature type 2 cytokines abundantly expressed in the inflamed sites of asthma, induce periostin in several tissue-resident cells—fibroblasts, airway epithelial cells, and endothelial cells—and then periostin contributes to generating thick basement membranes, a typical histological feature in asthma patients. Periostin would play a role in accelerating airway allergic inflammation in asthma by acting as a matricellular protein. Serum periostin has characteristics as a biomarker, reflecting both type 2 inflammation and remodeling/fibrosis in asthma patients. These characteristics are useful for stratifying asthma patients and can predict the ICS resistance or efficacy of molecularly targeted drugs such as IL-4/IL-13 antagonists for asthma patients.
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1 Introduction
Periostin was originally identified in 1993 as osteoblast-specific factor 2, a molecule highly expressed in the mouse osteoblastic cell line MC3T3-E1 [1]. It was then renamed periostin in 1999 because it is preferentially expressed in the periosteum and in periodontal ligaments [2].
Periostin has two characteristics: an extracellular matrix (ECM) protein and a matricellular protein [3, 4]. Periostin has a cysteine-rich EMILIN (EMI) domain at the N terminus and four fasciclin (FAS) 1 domains in the middle. These domains are important for binding to other ECM proteins such as collagen 1, fibronectin (EMI domain), and tenascin-C (FAS1 domain). Such functions of periostin as an ECM protein are important for maintaining tissue or organ structures in physiological conditions and in generating fibrosis in pathological conditions. Additionally, periostin binds to several integrins on the cell surface, transducing intracellular signaling via FAK, PI3-kinase, Akt, ERK, NF-κB, STAT3, and so on [3]. That is why periostin is classified as a matricellular protein defined as an ECM protein binding to its receptor on cell surfaces and functioning in cell activation rather than in maintenance of tissue structure. The aspect of periostin as a matricellular protein is important in the onset of inflammatory conditions, including asthma. It has been shown that periostin is expressed in various pathological conditions or diseases—allergic diseases, pulmonary fibrosis, scleroderma, renal diseases, ocular diseases, and malignancies—and plays a role in accelerating those by acting as both an ECM protein and a matricellular protein [4,5,6,7,8,9].
In this chapter, we focus on the expression and functions of periostin in asthma and then explain the usefulness of periostin as a biomarker for asthma.
2 Expression of Periostin in Asthma
It is known that various triggers—TGF-β, angiotensin II, connective tissue growth factor 2, bone morphogenetic protein 2, mechanical stress, and stimuli from malignancies—induce periostin expression [10,11,12] (Fig. 7.1). We found for the first time that IL-4 and IL-13, signature type 2 cytokines, induce periostin [13, 14]. In our hands, both airway epithelial cells and lung fibroblasts express periostin at the mRNA level; lung fibroblasts, but not airway epithelial cells, secrete periostin protein following stimulation by IL-4 or IL-13. That is why periostin can be used as a surrogate biomarker for IL-4 or IL-13, as we will mention below. It was then reported that periostin is secreted from the basal side, but not from the apical side of airway epithelial cells stimulated by IL-13, using an air/liquid interface method in which one side of the airway epithelial cells faces air, whereas the other side faces liquid medium [15]. Moreover, it was reported that microvascular endothelial cells can secrete periostin by stimulation of IL-4 or IL-13 [16]. Thus, at least three kinds of tissue-resident cells in the lung—fibroblasts, epithelial cells, and endothelial cells—can produce periostin in response to IL-4 or IL-13.
Under normal conditions, periostin is only very weakly deposited in part of the bronchiolar basement membrane [17]. In contrast, periostin is robustly deposited on the thickened basement membrane in asthma patients, consistent with the notion that IL-4 and IL-13, triggers to induce periostin, are abundantly expressed in the bronchial tissues of these patients [14] (Fig. 7.2). Periostin is co-localized with collagens I, III, and V, fibronectin, and tenascin-C—all of them are ECM components of thickened basement membrane in asthma. This suggests that by binding to these ECM proteins, periostin thickens the basement membrane, a typical histological feature of asthma. In asthma patients, periostin in inflamed sites is likely to move easily to blood [18,19,20] and sputum [21, 22], although the precise mechanism of the movement or secretion remains elusive. That is also why periostin has an advantage as a biomarker for asthma.
3 Functions of Periostin in Asthma
Several trials to clarify the significance of periostin in the pathogenesis of asthma have been carried out using asthma model mice; however, the results are controversial and the conclusion remains uncertain. It was initially reported that when periostin-deficient mice were challenged with ovalbumin or Aspergillus, airway hyperresponsiveness (AHR), type 2 inflammation, and mucus production were also enhanced in these mice [23, 24]. These results suggested that periostin protects against allergic inflammation in these model mice. In contrast, Bentley et al. reported that all of these features—AHR, type 2 inflammation, and mucus production—were impaired in house dust mite (HDM)-challenged periostin-deficient mice and by administration of neutralizing anti-periostin antibodies [25]. These results suggested that, in contrast to the initial studies, periostin accelerates allergic inflammation in these model mice. They showed the importance of periostin in dendritic cells (DCs) in this context as adoptive transfer of HDM-treated bone marrow-derived DCs from wild-type mice into periostin-deficient mice restored HDM-induced asthma-like phenotypes. The reason for this contradiction is not yet known.
Kanemitsu et al. examined the importance of periostin deposition in asthma patients [26]. They analyzed the correlation between periostin expression in some biopsy samples that they took from asthma patients more than 20 years ago and recent changes of pulmonary function in those same patients. They found that deposition of periostin in the bronchial subepithelium in the samples was strongly inversely correlated with decline of ΔFEV1. These results support the notion that periostin plays a role in accelerating airway allergic inflammation in asthma patients.
We have examined the importance of periostin as a matricellular protein in the process of inflammation using in vitro systems. We have shown that particularly the involvement of periostin in the epithelial/mesenchymal interaction would be important for the pathogenesis of allergic diseases, including asthma (Fig. 7.3). In the three-dimensional organotypic co-culture system mimicking the epithelial/mesenchymal interaction in skin tissues, we showed that periostin derived from fibroblasts stimulated by IL-13 acts on keratinocytes by itself activating NF-κB inducing production of pro-inflammatory cytokines including TSLP [27]. Using the same system, we also showed that periostin acts on fibroblasts together with IL-1α activating NF-κB inducing IL-6 [28]. Moreover, we found that cooperative actions of periostin and either TNF-α or IL-1α activate NF-κB in lung fibroblasts, followed by production of MCP1/3, CXCL1/2, and IL-1β, pro-inflammatory cytokines important for recruiting neutrophils and macrophages [29]. These results point to the capability of periostin to activate NF-κB in tissue-resident cells such as epithelial cells and fibroblasts by itself or by cross talk with other pro-inflammatory mediators. Regarding periostin’s actions on immune cells, it has been reported that it can act on eosinophils, inducing adhesion, superoxide generation, and TGF-β production [30, 31]. Thus, it is assumed that periostin plays various roles as a pro-inflammatory mediator acting on both tissue-resident cells and immune cells.
4 Periostin as a Biomarker for Asthma
4.1 A Biomarker for Type 2 (Th2-High) Asthma
It is now recognized that asthma is not a single disease but a syndrome [32]. We have empirically classified asthma patients based on clinical features such as age of onset (pediatric vs. adult), IgE dependency (atopic vs. nonatopic), and responsiveness to inhaled corticosteroids (ICSs, steroid-responsive vs. steroid-resistant). These classifications are based on phenotypes. In contrast, the significance of classifications based on molecular mechanisms of diseases, called endotypes, has recently emerged. Classifying asthma by type 2 vs. non-type 2 (or Th2-high vs. Th2-low) is an example of using endotypes [32]. This concept, “stratification of asthma patients,” is the basis for applying molecularly targeted drugs for asthma, as we will discuss later.
The proportion of type 2 asthma defined by high expression of IL-5 and IL-13, signature type 2 cytokines, is estimated to be 50–70% of total asthma patients [33, 34]. Asano and his colleagues have recently estimated the proportion of type 2 in severe asthma patients to be ~80% in a Japanese population [35]. Fahy and his colleagues searched for biomarkers for type 2 asthma, finding that periostin is highly expressed in bronchial tissues of type 2 asthma patients together with chloride channel regulator 1 (CLCA1) and serpin peptidase inhibitor, clade B, member 2 (SERPINB2) [33]. They then found that serum periostin is high in type 2 asthma correlated with airway eosinophilia, compared to the fraction of exhaled nitric oxide (FeNO), peripheral blood eosinophils, YKL-40, and IgE levels [34]. These results demonstrate that periostin has emerged as a novel biomarker for type 2 asthma (Fig. 7.4).
Our collaborators have intensively examined the characteristics of asthma patients correlated with serum periostin levels, using periostin ELISA kits with high sensitivity that we developed compared to other kits [36]. It has turned out that periostin is associated with eosinophil dominance [18,19,20, 37], late onset [18, 19], aspirin intolerance [19, 20], chronic sinusitis/olfactory dysfunction [18,19,20], and high FeNO [36,37,38]. These characteristics are known to be correlated with type 2 inflammation, which is consistent with the concept that periostin reflects type 2 inflammation. Moreover, these characteristics are known to be correlated with remodeling or fibrosis leading to resistance to treatments for asthma as we will mention next.
4.2 A Biomarker for ICS Resistance
We and our collaborators have shown that periostin is a component of the thickened basement membranes of asthma and is correlated with poor long-term prognosis [14, 26], suggesting that periostin has another characteristic as a biomarker for asthma reflecting remodeling or fibrosis. Matsumoto and her colleagues have demonstrated that periostin is associated with resistance to ICSs, the first-line drugs for asthma patients, which would be explained by this characteristic (Fig. 7.4). In the KiHAC study, when they divided asthma patients into rapid decliners and non-rapid decliners, defined by patients with treatments by ICS showing a decline in FEV1 of more than or less than 30 mL/year, respectively, serum periostin was higher in rapid decliners than in non-rapid decliners. This suggests that serum periostin is associated with hyporesponsiveness to ICSs in asthma [18]. When they clustered these patients based on their peripheral eosinophil and neutrophil numbers, cluster 3, which was characterized by high eosinophils and low neutrophil numbers and late onset, showed that the difference in decline of FEV1 between the periostin-high and periostin-low groups was more significant compared to the overall patients. This suggests that in this cluster, serum periostin is more associated with poor responsiveness to ICSs [39]. The association of serum periostin with poor responsiveness to ICSs was also observed in other studies [19, 36, 37]. Kato et al. showed more direct evidence for this association; when they tapered ICS treatment, asthma patients with high periostin showed a higher risk for instability than those with low periostin [40]. Introducing ICS to asthma patients promptly decreased FeNO levels, whereas it sustained high serum periostin levels. This finding suggests that ICS improves superficial inflammation consistent with decreased FeNO secreted from epithelial cells, whereas ICS does not improve the inflammation of deep layers consistent with sustained serum periostin [41]. Such limited efficacy of ICSs for asthma patients may lead to resistance to ICSs in periostin-high asthma patients showing high remodeling or fibrosis.
4.3 A Biomarker for Predicting the Efficacy of Molecularly Targeted Drugs for Type 2 Asthma
Currently, many drugs for type 2 asthma targeting IgE, IL-4/IL-13(receptor), IL-5(receptor), TSLP, CCR3, CCR4, CCL11, and CRTH2 are being developed. Some of them, two kinds of anti-IL-5 antibodies—mepolizumab and reslizumab—are already available at the start of 2018 [42]. Since periostin is a surrogate biomarker for type 2 asthma, particularly a downstream molecule of IL-4 and IL-13, several trials to apply periostin to a biomarker to predict efficacy of asthma drugs targeting IL-4 and IL-13 have been performed.
The first trial was carried out in the phase IIb study for lebrikizumab, an anti-IL-13 antibody, developed by Roche/Genentech [43]. They demonstrated that when they set the cutoff value of serum periostin at 50 ng/mL, the high periostin group showed good responsiveness to lebrikizumab, whereas the low periostin group showed poor responsiveness to it, demonstrating that serum periostin is a very useful biomarker to predict the efficacy of lebrikizumab. However, in the phase III study, lebrikizumab did not show enough efficacy for asthma patients, and development was ended [44]. In the phase IIb study of tralokinumab, another anti-IL-13 antibody, developed by AstraZeneca/MedImmune, both periostin and DPP-4, another type 2 biomarker, showed good ability to discriminate between good and poor responders to it as well as to lebrikizumab [45]. It is now in phase III study. Sanofi/Regeneron has developed dupilumab, an anti-IL-4 receptor α chain antibody that inhibits both IL-4 and IL-13 signals, as the first molecularly targeted drug for atopic dermatitis [46]. They have also developed dupilumab as an anti-asthma drug. In the phase IIb study, they used the blood eosinophil number as a biomarker to stratify patients; however, although the high eosinophil group tended to respond better than the low eosinophil group, dupilumab showed statistically significant efficacy in both groups [47]. It is also now in phase III.
We have examined the ability of serum periostin for this purpose instead of blood eosinophil number using the same samples as a post hoc study, finding that serum periostin showed a good ability to discriminate between good and poor responders as defined by improved lung functions (unpublished data, presented at the ERS Congress, 2016). Taken together, serum periostin has the potential to be a useful biomarker to predict the efficacy of IL-4/IL-13 antagonists (Fig. 7.4).
The usefulness of periostin as a biomarker to predict of efficacy of molecularly targeted drugs for type 2 asthma was examined for omalizumab, an anti-IgE antibody, provided by Novartis/Genentech. At this point, two studies have shown its usefulness [48, 49]. To our knowledge, these are the only studies so far to examine the usefulness of serum periostin as a biomarker to predict efficacy of molecularly targeted drugs for type 2 asthma except IL-4/IL-13 antagonists. These results point to the possibility that serum periostin is useful to predict efficacy of more molecularly targeted drugs for type 2 asthma other than IL-4/IL-13 antagonists.
5 Conclusion
It is strongly suggested that periostin acts as a pro-inflammatory mediator in asthma, although it has not been conclusively shown. Moreover, the usefulness of periostin as a biomarker for asthma—reflection of type 2 inflammation, resistance to ICS treatment, and prediction efficacy of several anti-asthma drugs targeting type 2 asthma—has been demonstrated. However, there still remain unresolved issues in this field—the pathological role of periostin in asthma, the usefulness of periostin as a biomarker to predict efficacy of molecularly targeted drugs for asthma, and the development of periostin detection systems more suitable for treating asthma patients. We need to begin to address these questions now.
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Acknowledgments
We thank Dr. Dovie R. Wylie for the critical review of this manuscript. We also thank the following colleagues and collaborators for contributing to the present work: Go Takayama, Masaru Uchida, Miho Masuoka, Hiroshi Shiraishi, Kanako Ontsuka, Kazuto Taniguchi, Yasutaka Mitamura, Tomohito Yoshihara, Kazuhiko Arima, Shoichi Suzuki, Shoichiro Ohta, Go Kato, Koichiro Takahashi, Shin-ichiro Hayashi (Saga Medical School), Noriko Yuyama (Genox Research, Inc.), Akihiro Ishida, Nobuo Ohta (Yamagata University), Hiroshi Fujishima (Tsurumi University), Naoko Okada, Kenji Matsumoto (National Research Institute for Child Health and Development Laboratory), Yoshihiro Kanemitsu, Tadao Nagasaki, Tomoko Tajiri, Hisako Matsumoto (Kyoto University), Masako Matsuzaka, Koichi Fukunaga (Keio University), Koichiro Asano (Tokai University), Yorihisa Kotobuki, Ichiro Katayama (Osaka University), Kenzen Kou, Yukie Yamaguchi, Michiko Aihara (Yokohama City University), Timothy Hinks, Peter Howarth (Southampton University Hospital), Mi-Ae Kim, Hae-Sim Park (Ajou University), Anna James, Sven-Erik Dahlen (Karolinska Institutet), Ayami Kamei, Yoshinori Azuma (Shino-Test Co.), Simon J. Conway (Indiana University), Masaki Okamoto, Tomoaki Hoshino, and Kiminori Fujimoto (Kurume University).
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Izuhara, K., Nunomura, S., Ono, J., Takai, M., Nanri, Y. (2019). Periostin as a Biomarker for Type 2 Asthma. In: Yokoyama, A. (eds) Advances in Asthma. Respiratory Disease Series: Diagnostic Tools and Disease Managements. Springer, Singapore. https://doi.org/10.1007/978-981-13-2790-2_7
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