Abstract:
BACKGROUND:Modification of the aminoacid sequence of peptides derived from the HLA class I heavy chain in combination with computer rational design resulted in the development of a peptide, RDP1258, with enhanced immunosuppressive activity. METHODS:We evaluated the activity of this peptide, analyzing infiltrate by immunohistology and cytokine transcripts by reverse transcriptase-polymerase chain reaction method, in a hamster-to-rat xenograft model where recipients were treated with cobra venom factor (CVF) and peptide. RESULTS:Although CVF or peptide alone had no effect, a combination of CVF/peptide RDP1258 resulted in a significant prolongation of graft survival (7.9+/-1 vs. 4.5+/-0 and 3.5+/-0 days, P<0.001). This effect was associated with an increased expression of heme oxygenase 1 (HO-1) in spleen, a significant reduced graft infiltrate, and a decrease of tumor necrosis factor-alpha mRNA transcripts (P<0.05) compared with CVF-treated recipients (1.6+/-0.07 vs. 3.3+/-0.3%, P=0.001) on day 3 after transplantation. CONCLUSION:These observations are consistent with the observation that up-regulation of HO-1 results in inhibition of immune effector functions and suggest that the peptide acts, at least partially, through HO-1 regulation.
journal_name
Transplantationjournal_title
Transplantationauthors
Brouard S,Cuturi MC,Pignon P,Buelow R,Loth P,Moreau A,Soulillou JPdoi
10.1097/00007890-199906270-00017subject
Has Abstractpub_date
1999-06-27 00:00:00pages
1614-8issue
12eissn
0041-1337issn
1534-6080journal_volume
67pub_type
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