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Serpins, Immunity and Autoimmunity: Old Molecules, New Functions

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Abstract

Serine protease inhibitors (serpins) are evolutionary old, structurally conserved molecules which encompass nearly all branches of life. More than 1,000 serpins were characterized to date which are subdivided into 16 subgroups (A–P) according to their common ancestry; among them, 37 are found in humans. Serpins were termed after their capability to inhibit serine proteases, but mounting evidence suggests that they may achieve a greater deal of functions, ranging from embryological growth to synaptic plasticity, development of both myeloid and lymphoid immune cells, and modulation of apoptosis. Serpins are mainly extracellular molecules, although some of them (namely, ov-serpins or clade B serpins) mostly act inside the cells, being either ubiquitously or tissue-specifically expressed. Among newly characterized serpin functions, regulation of cellular proliferation through apoptosis modulation and proteasome disturbance seems to play a major role. Accordingly, several serpins were found to be hyperexpressed in tumor cells. Indeed, apoptosis dysregulation is likely to be a cornerstone in both tumorigenesis and autoimmunity, since uncontrolled cellular viability results in tumor proliferation, while inefficient disposal of apoptotic debris may favor the rescue of autoreactive immune cells. Such a process was widely documented in systemic lupus erythematosus (SLE). Interestingly, alterations in the expression of some serpins, e.g., the ov-serpin SERPINB3, are being unraveled in patients affected with SLE and other autoimmune disorders, suggesting that a failure in serpin function might affect immune homeostasis and self-tolerance, thereby contributing to autoimmunity. Here, we provide an overview of serpin origin, function, and dysfunction, focusing on human serpins and ov-serpins, with a hub on SERPINB3.

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Authors and Affiliations

  1. Division of Rheumatology, Department of Medicine, University of Padua, Via Giustiniani 2, 35128, Padua, Italy

    Mariele Gatto, Luca Iaccarino, Anna Ghirardello, Nicola Bassi, Leonardo Punzi & Andrea Doria

  2. Department of Medicine, University of Padua, Via Giustiniani 2, 35128, Padua, Italy

    Patrizia Pontisso

  3. Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center; Incumbent of the Laura Schwarz-Kipp Chair for Research of Autoimmune Diseases, Tel Aviv University, Tel Hashomer, 52621, Israel

    Yehuda Shoenfeld

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  7. Yehuda Shoenfeld
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  8. Andrea Doria
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Correspondence to Andrea Doria.

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Gatto, M., Iaccarino, L., Ghirardello, A. et al. Serpins, Immunity and Autoimmunity: Old Molecules, New Functions. Clinic Rev Allerg Immunol 45, 267–280 (2013). https://doi.org/10.1007/s12016-013-8353-3

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  • DOI: https://doi.org/10.1007/s12016-013-8353-3

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