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Title:	Transgenic expression of soluble human CD5 enhances experimentally-induced autoimmune and anti-tumoral immune responses
Authors:	Fenutria, Rafael; Martínez, Vanesa G.; Postigo, Jorge; Merino, Jesús; Merino, Ramón ; Lozano, Francisco
Issue Date:	2014
Publisher:	Public Library of Science
Citation:	PLoS ONE 9(1): e84895 (2014)
Abstract:	CD5 is a lymphoid-specific transmembrane glycoprotein constitutively expressed on thymocytes and mature T and B1a lymphocytes. Current data support the view that CD5 is a negative regulator of antigen-specific receptor-mediated signaling in these cells, and that this would likely be achieved through interaction with CD5 ligand/s (CD5L) of still undefined nature expressed on immune or accessory cells. To determine the functional consequence of loss of CD5/CD5L interaction in vivo, a new transgenic mouse line was generated (shCD5EμTg), expressing a circulating soluble form of human CD5 (shCD5) as a decoy to impair membrane-bound CD5 function. These shCD5EmTg mice showed an enhanced response to autologous antigens, as deduced from the presentation of more severe forms of experimentally inducible autoimmune disease (collagen-induced arthritis, CIA; and experimental autoimmune encephalitis, EAE), as well as an increased antitumoral response in non-orthotopic cancer models (B16 melanoma). This enhancement of the immune response was in agreement with the finding of significantly reduced proportions of spleen and lymph node Treg cells (CD4+CD25+FoxP3+), and of peritoneal IL-10-producing and CD5+ B cells, as well as an increased proportion of spleen NKT cells in shCD5EμTg mice. Similar changes in lymphocyte subpopulations were observed in wild-type mice following repeated administration of exogenous recombinant shCD5 protein. These data reveal the relevant role played by CD5/CD5L interactions on the homeostasis of some functionally relevant lymphocyte subpopulations and the modulation of immune responses to autologous antigens.
Description:	This is an open-access article distributed under the terms of the Creative Commons Attribution License.-- et al.
Publisher version (URL):	http://dx.doi.org/10.1371/journal.pone.0084895
URI:	http://hdl.handle.net/10261/130549
DOI:	10.1371/journal.pone.0084895
Identifiers:	doi: 10.1371/journal.pone.0084895 issn: 1932-6203
Appears in Collections:	(IBBTEC) Artículos