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      Periostin as a Heterofunctional Regulator of Cardiac Development and Disease

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          Abstract

          Periostin (Postn) is a heterofunctional secreted extracellular matrix (ECM) protein comprised of four fasciclin domains that promotes cellular adhesion and movement, as well as collagen fibrillogenesis. Postn is expressed in unique growth centers during embryonic development where it facilitates epithelial-mesenchymal transition (EMT) of select cell populations undergoing reorganization. In the heart, Postn is expressed in the developing valves, cardiac fibroblasts and in regions of the outflow track. In the adult, Postn expression is specifically induced in areas of tissue injury or areas with ongoing cellular re-organization. In the adult heart Postn is induced in the ventricles following myocardial infarction, pressure overload stimulation, or generalized cardiomyopathy. Here we will review the functional consequences associated with Postn induction in both the developing and adult heart. The majority of data collected to date suggest a common function for Postn in both development and disease as a potent inducible regulator of cellular reorganization and extracellular matrix homeostasis, although some alternate and controversial functions have also been ascribed to Postn, the validity of which will be discussed here.

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          Transcription factor YY1: structure, function, and therapeutic implications in cancer biology.

          S. Gordon, G. Akopyan, H Garbán … (2006)
          The ubiquitous transcription factor Yin Yang 1 (YY1) is known to have a fundamental role in normal biologic processes such as embryogenesis, differentiation, replication, and cellular proliferation. YY1 exerts its effects on genes involved in these processes via its ability to initiate, activate, or repress transcription depending upon the context in which it binds. Mechanisms of action include direct activation or repression, indirect activation or repression via cofactor recruitment, or activation or repression by disruption of binding sites or conformational DNA changes. YY1 activity is regulated by transcription factors and cytoplasmic proteins that have been shown to abrogate or completely inhibit YY1-mediated activation or repression; however, these mechanisms have not yet been fully elucidated. Since expression and function of YY1 are known to be intimately associated with progression through phases of the cell cycle, the physiologic significance of YY1 activity has recently been applied to models of tumor biology. The majority of the data are consistent with the hypothesis that YY1 overexpression and/or activation is associated with unchecked cellular proliferation, resistance to apoptotic stimuli, tumorigenesis and metastatic potential. Studies involving hematopoetic tumors, epithelial-based tumors, endocrine organ malignancies, hepatocellular carcinoma, and retinoblastoma support this hypothesis. Molecular mechanisms that have been investigated include YY1-mediated downregulation of p53 activity, interference with poly-ADP-ribose polymerase, alteration in c-myc and nuclear factor-kappa B (NF-kappaB) expression, regulation of death genes and gene products, and differential YY1 binding in the presence of inflammatory mediators. Further, recent findings implicate YY1 in the regulation of tumor cell resistance to chemotherapeutics and immune-mediated apoptotic stimuli. Taken together, these findings provide strong support of the hypothesis that YY1, in addition to its regulatory roles in normal biologic processes, may possess the potential to act as an initiator of tumorigenesis and may thus serve as both a diagnostic and prognostic tumor marker; furthermore, it may provide an effective target for antitumor chemotherapy and/or immunotherapy. .Oncogene (2006) 25, 1125-1142. doi:10.1038/sj.onc.1209080; published online 28 November 2005.
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            Genome-wide profiling identifies epithelial cell genes associated with asthma and with treatment response to corticosteroids.

            Prescott G Woodruff, Homer A Boushey, Gregory M Dolganov … (2007)
            Airway inflammation and epithelial remodeling are two key features of asthma. IL-13 and other cytokines produced during T helper type 2 cell-driven allergic inflammation contribute to airway epithelial goblet cell metaplasia and may alter epithelial-mesenchymal signaling, leading to increased subepithelial fibrosis or hyperplasia of smooth muscle. The beneficial effects of corticosteroids in asthma could relate to their ability to directly or indirectly decrease epithelial cell activation by inflammatory cells and cytokines. To identify markers of epithelial cell dysfunction and the effects of corticosteroids on epithelial cells in asthma, we studied airway epithelial cells collected from asthmatic subjects enrolled in a randomized controlled trial of inhaled corticosteroids, from healthy subjects and from smokers (disease control). By using gene expression microarrays, we found that chloride channel, calcium-activated, family member 1 (CLCA1), periostin, and serine peptidase inhibitor, clade B (ovalbumin), member 2 (serpinB2) were up-regulated in asthma but not in smokers. Corticosteroid treatment down-regulated expression of these three genes and markedly up-regulated expression of FK506-binding protein 51 (FKBP51). Whereas high baseline expression of CLCA1, periostin, and serpinB2 was associated with a good clinical response to corticosteroids, high expression of FKBP51 was associated with a poor response. By using airway epithelial cells in culture, we found that IL-13 increased expression of CLCA1, periostin, and serpinB2, an effect that was suppressed by corticosteroids. Corticosteroids also induced expression of FKBP51. Taken together, our findings show that airway epithelial cells in asthma have a distinct activation profile and identify direct and cell-autonomous effects of corticosteroid treatment on airway epithelial cells that relate to treatment responses and can now be the focus of specific mechanistic studies.
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              Periostin: a novel component of subepithelial fibrosis of bronchial asthma downstream of IL-4 and IL-13 signals.

              Go Takayama, Kazuhiko Arima, Taisuke Kanaji … (2006)
              Subepithelial fibrosis is a cardinal feature of bronchial asthma. Collagen I, III, and V; fibronectin; and tenascin-C are deposited in the lamina reticularis. Extensive evidence supports the pivotal role of IL-4 and IL-13 in subepithelial fibrosis; however, the precise mechanism remains unclear. We have previously identified the POSTN gene encoding periostin as an IL-4/IL-13-inducible gene in bronchial epithelial cells. Periostin is thought to be an adhesion molecule because it possesses 4 fasciclin I domains. We explore the possibility that periostin is involved in subepithelial fibrosis in bronchial asthma. We analyzed induction of periostin in lung fibroblasts by IL-4 or IL-13. We next analyzed expression of periostin in patients with asthma and in ovalbumin-sensitized and ovalbumin-inhaled mice. Furthermore, we examined the binding ability of periostin to other extracellular matrix proteins. Both IL-4 and IL-13 induced secretion of periostin in lung fibroblasts independently of TGF-beta. Periostin colocalized with other extracellular matrix proteins involved in subepithelial fibrosis in both asthma patients and ovalbumin-sensitized and ovalbumin-inhaled wild-type mice, but not in either IL-4 or IL-13 knockout mice. Periostin had an ability to bind to fibronectin, tenascin-C, collagen V, and periostin itself. Periostin secreted by lung fibroblasts in response to IL-4 and/or IL-13 is a novel component of subepithelial fibrosis in bronchial asthma. Periostin may contribute to this process by binding to other extracellular matrix proteins. Periostin induced by IL-4/IL-13 shows promise in inhibiting subepithelial fibrosis in bronchial asthma.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Curr Genomics
                Journal ID (publisher-id): CG
                Title: Current Genomics
                Publisher: Bentham Science Publishers Ltd.
                ISSN (Print): 1389-2029
                ISSN (Electronic): 1875-5488
                Publication date (Print): December 2008
                Volume: 9
                Issue: 8
                Pages: 548-555
                Affiliations
                [1 ]Riley Heart Research Center, Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
                [2 ]Dept. of Pediatrics, University of Cincinnati, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Ave, Cincinnati, OH, 45229, USA
                Author notes
                [* ]Address correspondence to these authors at the Riley Heart Research Center, Herman B Wells Center for Pediatric Research, 1044 West Walnut Street, Room R4 W379, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Tel: 317-278-8780, Lab: 317-278-8781; Fax: 317-278-5413; E-mail: siconway@ 123456iupui.edu or Children's Hospital Medical Center, Molecular Cardiovascular Biology, 3333 Burnet Ave MLC7020, Cincinnati, OH 45229-3039, USA; Tel: (513)-636-3557; Fax: (513)-636-5958; E-mail: Jeff.molkentin@ 123456cchmc.org
                Article
                Publisher ID: CG-9-548
                DOI: 10.2174/138920208786847917
                PMC ID: 2694556
                PubMed ID: 19516962
                SO-VID: 6fe321be-73e0-48b8-bf9f-9683c10d6cdc
                Copyright © ©2008 Bentham Science Publishers Ltd.
                License:

                This is an open access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.5/) which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 6 July 2008
                Date revision received : 3 August 2008
                Date accepted : 13 August 2008
                Categories
                Subject: Article

                ScienceOpen disciplines: Genetics
                Keywords: signaling,cardiac,periostin,remodeling.,hypertrophy,development
                Data availability:
                ScienceOpen disciplines: Genetics
                Keywords: signaling, cardiac, periostin, remodeling., hypertrophy, development

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