In terms of Th1/Th2 balance in response to signals given during donor antigen presentation, induction of tolerance is more often correlated with Th2-type than with Th1-type reactions. However, in our study, heart allograft survival was prolonged by treatment of rats with a Th2 inhibitor. Suplatast tosilate (IPD; Taiho; Tokyo, Japan) is a novel immunoregulator that suppresses IgE production and eosinophil infiltration through selective inhibition of interleukin (IL)-4 and IL-5 synthesis by Th2-like cells but not IFN-γ production in Th1 cells. Five LEW rats of DA heart grafts were treated with IPD (100 μg/day, p.o.) for 10 days. Heart allograft survival of all IPD-treated cases was prolonged more than 14 days while the beating of heart grafts in control groups was stopped within 9 days. In an in vitro study, the cell proliferation both in Con A blast and in mixed lymphocyte reaction assay was suppressed by IPD in dose-dependent manner. We could at least in part conclude that Th2 inhibition might temporarily suppress heart allograft rejection. © 2002 Elsevier Science B.V. All rights reserved.

Item Type:	Letter or Note in Journal
Research Division:	Medical and Health Sciences
Research Group:	Immunology
Research Field:	Transplantation Immunology
Objective Division:	Health
Objective Group:	Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:	Immune System and Allergy
Author:	Lord, RJ (Dr Roger Lord)
ID Code:	29083
Year Published:	2003
Deposited By:	Surgery
Deposited On:	2003-08-01
Last Modified:	2004-07-07
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