CzMA JEP Home page CZECH MEDICAL ASSOCIATION J. Ev. PURKYNĚ
Journals - Article
CzMA JEP Home page News About Assocation Publishing Division Medical Journals Searching Supplements Catalogue
 
  Česky / Czech version Čas. Lék. čes., 2006, 145, pp. 647–652.
 
Auto- and Alloreactivity of T Lymphocytes in Myelodysplastic Syndrome 
Cukrová V., 1Neuwirtová R., 2Bartůňková J., 1Jonášová A., Čermák J., 3Homolková H., 3Malíková I. 

Ústav hematologie a krevní transfuze, Praha 1I. interní klinika 1. LF UK a VFN, Praha2Ústav imunologie 2. LF UK, Praha 3Centrální hematologická laboratoř VFN, Praha
 


Summary:

       Background. Successful therapy with ATG and cyclosporine A in some myelodysplastic syndrome (MDS) patients led us to study the existence of T cells attacking autologous hemopoietic cells. In our study, we attempted to give the direct prove of autoreactive T cells in MDS (autoreactivity analysis). Simultaneously, we analysed the capacity of MDS patients to respond to allogeneic cells from unrelated individuals (alloreactivity analysis). Methods and Results. Autoreactive lymphocytes directed against own bone marrow mononuclear cells were analysed using the modification of cell mediated cytotoxic reaction. With one exception we did not confirm the presence of autoreactive T cells among 10 patients examined. Analysis of alloreactivity was performed by means of standard cell mediated cytotoxic reaction and mixed lymphocyte reaction. Surprisingly, the cytotoxic response to allogeneic cells was negative in 11 MDS patients from 16 analysed. When comparing refractory anaemia (RA) and refractory anaemia with ring sideroblasts (RARS) patients, the proportion of negative results was higher in RA (78 %) than in RARS (40 %). In mixed lymphocyte reaction, the response of MDS cells to allogeneic cells of unrelated individual was positive in all tested patients. The preliminary testing of TNF and IFNγ secretion examined in supernatants of effector cells showed impaired levels of both cytokines in RA and normal levels in RARS in accordance with the findings achieved in alloreactivity analysis. Conclusions. Autoreactive T cells were not found in MDS patients using our experimental arrangement. Analysis of alloreactivity showed the defect in effector -cytotoxic- phase of cell mediated cytotoxic reaction in the majority of MDS patients. The initial phase of this reaction represented in vitro by mixed lymphocyte reaction gave normal results. The possible reasons of disturbed alloreactivity and its relevance to immunity in MDS are commented in discussion.

        Key words: myelodysplastic syndrome, cytotoxic T lymphocytes, autoreactivity, alloreactivity, cytokines.
       

Order this issue

  BACK TO CONTENTS  
 
 
| HOME PAGE | CODE PAGE | CZECH VERSION |
©  1998 - 2008 CZECH MEDICAL ASSOCIATION J. E. PURKYNĚ
Created by: NT Servis, s.r.o., hosted by P.E.S. consulting, s.r.o.
WEBMASTER