4.6 Article

Correlation of Hsp70-1 and Hsp70-2 gene expression with the degree of graft-versus-host reaction in a rat skin explant model

Journal

TRANSPLANTATION
Volume 85, Issue 12, Pages 1809-1816

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/TP.0b013e31817753f7

Keywords

graft-versus-host disease; heat shock protein 70 genes; major histocompatibility complex; animal model; skin explant assay

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Background. Graft-versus-host disease (GVHD) is the most serious complication after allogeneic hematopoietic stem-cell transplantation. A human skin explant assay has been used to predict the risk of GVHD in patients by histological grading of graft-versus-host reactions (GVHR). New molecular markers of GVHR might help to further increase the predictive value of the assay. Methods. A rat skin explant assay has been developed to further aid in identifying potential novel molecular markers. Results. In inbred rat strains GVHR were observed in skin explants co-cultured with allogeneic lymphocytes stimulated against minor or major histocompatibility antigens. The histological signs of GVHR were similar to those observed in human skin explant assays and acute GVHD lesions occurring in rats after experimental bone marrow transplantation. Heat shock protein (HSP) 70 has been shown to be expressed during GVHR. We therefore investigated the expression of the three major histocompatibility complex (MHC)-linked HSP70 genes in rat skin explants. The two major stress-inducible genes Hsp70-1 and Hsp70-2 were found to be upregulated in the allogeneic rat skin explant assays. The increase in mRNA correlated with the GVHR grade (I-IV). Interestingly, the expression of the third MHC-linked Hsp70 gene Hsp70-3 was not found to be augmented during GVHR. Conclusion. The observed induction of the MHC-encoded Hsp70-1 and Hsp70-2 genes might serve as new markers of GVHR and as potentially novel diagnostic tools for GVHD.

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