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2014 ; 98
(11
): 1165-74
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Therapeutic blockade of LIGHT interaction with herpesvirus entry mediator and
lymphotoxin ? receptor attenuates in vivo cytotoxic allogeneic responses
#MMPMID25226173
del Rio ML
; Fernandez-Renedo C
; Scheu S
; Pfeffer K
; Shintani Y
; Kronenberg M
; Chaloin O
; Schneider P
; Rodriguez-Barbosa JI
Transplantation
2014[Dec]; 98
(11
): 1165-74
PMID25226173
show ga
BACKGROUND: Tumor necrosis factor/tumor necrosis factor receptor superfamily
members conform a group of molecular interaction pathways of essential relevance
during the process of T-cell activation and differentiation toward effector cells
and particularly for the maintenance phase of the immune response. Specific
blockade of these interacting pathways, such as CD40-CD40L, contributes to
modulate the deleterious outcome of allogeneic immune responses. We postulated
that antagonizing the interaction of LIGHT expression on activated T cells with
its receptors, herpesvirus entry mediator and lymphotoxin ? receptor, may
decrease T cell-mediated allogeneic responses. METHODS: A flow cytometry
competition assay was designed to identify anti-LIGHT monoclonal antibodies
capable to prevent the interaction of mouse LIGHT with its receptors expressed on
transfected cells. An antibody with the desired specificity was evaluated in a
short-term in vivo allogeneic cytotoxic assay and tested for its ability to
detect endogenous mouse LIGHT. RESULTS: We provide evidence for the first time
that in mice, as previously described in humans, LIGHT protein is rapidly and
transiently expressed after T-cell activation, and this expression was stronger
on CD8 T cells than on CD4 T cells. Two anti-LIGHT antibodies prevented
interactions of mouse LIGHT with its two known receptors, herpesvirus entry
mediator and lymphotoxin ? receptor. In vivo administration of anti-LIGHT
antibody (clone 10F12) ameliorated host antidonor short-term cytotoxic response
in wild type B6 mice, although to a lesser extent than that observed in
LIGHT-deficient mice. CONCLUSION: The therapeutic targeting of LIGHT may
contribute to achieve a better control of cytotoxic responses refractory to
current immunosuppressive drugs in transplantation.