Abstract: HomeCirculation ResearchVol. 101, No. 3Periostin Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBPeriostinMore Than Just an Adhesion Molecule Thomas K. Borg and Roger Markwald Thomas K. BorgThomas K. Borg From the Department of Cell and Developmental Biology and Anatomy (T.K.B.), University of South Carolina, Columbia; and the Department of Cell Biology and Anatomy (R.M.), Medical University of South Carolina, Charleston. and Roger MarkwaldRoger Markwald From the Department of Cell and Developmental Biology and Anatomy (T.K.B.), University of South Carolina, Columbia; and the Department of Cell Biology and Anatomy (R.M.), Medical University of South Carolina, Charleston. Originally published3 Aug 2007https://doi.org/10.1161/CIRCRESAHA.107.159103Circulation Research. 2007;101:230–231The form and function of the heart is determined by the dynamic interaction of both intra and extracellular signals. During normal growth of the neonatal heart myocytes undergo hypertrophy in response to variety of signals including changes in blood pressure1–3. The number of fibroblasts also increase and the collagenous connective tissue is formed.4,7,8 The coordination of these postnatal signals and cell interactions result in a heart that is adapted to adult function. However, in response to a changing environment, eg, hypertrophy, infarction, or failure, the normal coordination of between these signals becomes disrupted and leads to detrimental cardiac remodeling. Understanding the sources of these signals and their relationship to the myocyte and nonmyocyte populations of the ventricular wall would seemingly be an important key to understanding and regulating the adaptive processes that lead to altered cardiac function and potentially catastrophic failure.It is well documented that the adaptive processes of cardiac remodeling are linked to dynamic myocyte-fibroblast interactions or cross-talk, including the expression of cytokines, ECM, as well as mechanical and electrical signals.9,10 Whereas the myocyte population remains relatively stable, the fibroblasts, as in neonatal life, appear to change dramatically during hypertrophy and injury.11 Of the various aspects of myocardial remodeling that have been explored in infarction, hypertrophy or congestive failure, most have centered on the changes in the extracellular compartment milieu, principally analyzing the changes in the amount of collagen and fibrosis. Correlative investigations have described the increases and alterations in the amount of collagen with changes in wall stiffness and altered function. For example, it is fundamentally understood that collagen is organized into fibrillar structures which can associate with the myocardial cell surface by which they exert mechanical effects. But how this happens, how it is regulated and how altered biomechanical properties adversely affect myocardial remodeiing remain important but unresolved questions.Answers to these questions were pursued in the article by Oka et al.4 They found that an adhesive protein called periostin was strongly upregulated before and during remodeling processes. They also determined that levels of periostin expression correlated with the amount of collagen produced. They reasoned that understanding more about how periostin contributed to fibroblast-myocyte interactions could seemly provide important new understanding on pathological remodeling in the heart and possible new targets for therapy. These authors clearly demonstrate that by genetically manipulating the expression levels of periostin they can affect the extent of scar formation associated with infarctions and hypertrophic growth. They also consider the cell specificity of periostin secretion and conclude that periostin is normally associated with fibroblasts. Previous studies indicated that periostin might be expressed by myocytes but these studies were equivocal6 as in vitro studies using neonatal myocytes are rarely free of fibroblasts.Periostin appears to be a unique extracellular protein secreted by fibroblasts that is upregulated following injury to the heart or changes in the environment. It has the ability to associate with other critical ECM regulators such as TGF-β, tenascin, and fibronectin, and as demonstrated by Oka and colleagues,4 periostin is a critical regulator of fibrosis by altering the deposition and attachment of collagen. These experiments combined with those reported by Norris et al5 showing that periostin regulated collagen fiber diameter and crosslinking, further suggest mechanisms by which periostin could regulate the mechanical properties of the heart wall would be by directly binding to fibrillar and nonfibrillar proteins of the extracellular matrix.Oka et al also provide important data that periostin can also modify adhesion between myocytes and fibroblasts which they suggest may modify wall stiffness or biomechanical properties depending on whether its expression is stimulated or downregulated. Periostin is often thought of as another adhesion protein because of its homology to Drosophila fasciclin proteins.4 But is periostin just another adhesion protein? The genetic and physiological findings of Oka et al and other recent reports12 indicate that periostin appears to interact with multiple cell-surface receptors, especially integrins, to signal changes in gene expression through Akt or PI3 kinase pathways.12 The contextual nature of its functions as reported by Oka et al are consistent with a dynamic role for periostin in contact-signaling between fibroblasts and cardiomyocytes that can modify adhesion as well as regulate collagen formation and fibrosis.Significantly, when perisotin was knocked out, animals had a much reduced fibrosis, which resulted in aneurysm and rupture of the ventricular wall, especially if subjected to changes in hemodynamic pressure or to a heart attack. Conversely, overexpression of periostin in the heart protected from rupture in infracted regions. This suggests that down regulating periostin could benefit a patient experiencing a remodeling disease, but if periostin is to be used as a therapeutic target, it might have to be given in a dose dependent manner that would not prevent formation of a collagen scar but rather limit its size. These data, point to the importance of analyzing remodeling as a multiple component process which includes populations of cardiac myocytes and fibroblasts, several ECM components, and the organization of the collagen network. Again, this point was emphasized in the periostin null mice that experienced ventricular rupture, indicating that the quantitative amount of periostin (and perhaps other ECM components) is critical to the physiological result.To summarize, the Oka article confirms that periostin is made by mesenchymal derived cells and that expression of periostin following injury or environmental perturbations can alter normal physiological interactions between fibroblasts and myocytes that can affect collagen, fibrosis and scar mechanics. Thus, by regulating extracellular or matricellular13 components, such as periostin, there is realistic potential for controlling the onset and/or progression of myocardial remodeling.The opinions expressed in this editorial are not necessarily those of the editors or of the American Heart Association.Sources of FundingThis work was supported by 2R01 HL33756-24A1 (Mucopolysaccharide Metabolism in Cardiac Anomalies), NSF EF-0526854 (FIBR - Understanding & Employing Multicellular Self-Assembly), 2P20 RR16434-06 (SC COBRE for Cardiovascular Diseases) to R.M., and R01 HL68038 (Integrin Shedding in the Heart: In Vivo and In Vitro) to T.B.DisclosuresNone.FootnotesCorrespondence to Thomas K. Borg, Department of Cell and Developmental Biology and Anatomy, University of South Carolina, Columbia 29208. E-mail [email protected] References 1 Fedak PWM, Verma S, Weisel RD, Li R-K. Cardiac remodeling and failure From molecules to man (Part I). Cardiovascular Pathology. 2005; 14: 1–11.CrossrefMedlineGoogle Scholar2 Fedak PWM, Verma S, Weisel RD, Li R-K. Cardiac remodeling and failure from molecules to man (Part II). Cardiovascular Pathology. 2005; 14: 49–60.CrossrefMedlineGoogle Scholar3 Fedak PWM, Verma S, Weisel RD, Skrtic M, Li R-K. Cardiac remodeling and failure From molecules to man (Part III). Cardiovascular Pathology. 2005; 14: 109–119.CrossrefMedlineGoogle Scholar4 Oka T, Xu J, Kaiser RA, Melendez J, Hambleton M, Sargent MA, Lorts A, Brunskill EW, Dorn GW, Conway SJ, Aronow BJ, Robbins J, Molkentin JD. Genetic manipulation of periostin expression reveals a role in cardiac hypertrophy and ventricular remodeling. Circulation Res. 2007; 101: 313–321.LinkGoogle Scholar5 Norris RA, Damon B, Mironov V, Kasyanov V, Ramamurthi A, Moreno-Rodriguez R, Trusk T, Potts JD, Goodwin RL, Davis J, HOoffman S, Wen X, Sugi Y, Kern CB, Mjaatvedt CH, Turner DK, Oka T, Conway SJ, Molkentin JD, Forgacs G, Markwald RR. Periostin regulates collagen fibrillogenesis and the biomechanical properties of connective tissues. J Cell Biochem. 2007; 101: 695–711.CrossrefMedlineGoogle Scholar6 Lekushi K, Taniyama Y, Azuma J, Katsuragi N, Dosaka N, Sanada F, Koibuchi N, Nagao K, Ogihara T, Morishita R. Novel mechanisms of valsartan on the treatment of acute myocardial infarction through inhibition of the antiadhesion molecule periostin. Hypertension. 2007; 49: 1409–1414.LinkGoogle Scholar7 Banerjee I, Fuseler JW, Price RL, Borg TK, Baudino TA. Determination of cell type and number during cardiac development in the neonatal and adult rat and mouse. Amer J Physiol. 2007. In press.Google Scholar8 Baudino TA, Carver W, Giles W, Borg TK. Cardiac fibroblasts: friend or foe? Am J Physiol. 2006; 291: H1015–H1026.CrossrefMedlineGoogle Scholar9 Camelliti P, Green CR, LeGrice I. Kohl P. Fibroblast network in rabbit sino-artial node: structural and functional identification of homo- and heterologous cell coupling. Circ Res. 2004; 94: 828–835.LinkGoogle Scholar10 Kohl P. Cardiac cellular heterogeneity and remodeling. Cardiovasc Res. 2004; 64: 195–197.CrossrefMedlineGoogle Scholar11 Visconti RG, Markwald RR. Recruitment of new cells into the postnatal heart: potential modification of phenotype by periostin. Ann N Y Acad Sci. 2006; 1080: 19–33.CrossrefMedlineGoogle Scholar12 Butcher JT, Norris RA, Hoffman S, et al. Periostin promotes atrioventricular mesenchyme matrix invasion and remodeling mediated by integrin signaling through Rho/PI 3-kinase. Dev Biol. 2007; 302: 256–266.CrossrefMedlineGoogle Scholar13 Bornstein P. Matricellular proteins: an overview. Matrix Biol. 2000; 19: 555–556.CrossrefMedlineGoogle Scholar eLetters(0)eLetters should relate to an article recently published in the journal and are not a forum for providing unpublished data. Comments are reviewed for appropriate use of tone and language. Comments are not peer-reviewed. 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