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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Identification of Novel Immunoregulatory Molecules in Human Thymic Regulatory CD4(+)CD25(+) T Cells by Phage Display

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Porto, Georgia [1, 2] ; Giordano, Ricardo J. [3, 4] ; Marti, Luciana C. [5] ; Stolf, Beatriz [6, 2] ; Pasqualini, Renata [4] ; Arap, Wadih [4] ; Kalil, Jorge [1, 2, 7] ; Coelho, Veronica [1, 2, 7]
Total Authors: 8
[1] Univ Sao Paulo, Div Clin Immunol & Allergy, Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Med, Inst Coracao InCor, Inst Heart, Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Chem, Sao Paulo - Brazil
[4] Univ Texas MD Anderson Canc Ctr, David H Koch Ctr, Houston, TX 77030 - USA
[5] Inst Israelita Ensino & Pesquisa Albert Einstein, Sao Paulo - Brazil
[6] Univ Sao Paulo, Inst Biomed Sci, Sao Paulo - Brazil
[7] Natl Inst Sci & Technol Iii INCT, Inst Invest Immunol, Sao Paulo - Brazil
Total Affiliations: 7
Document type: Journal article
Source: PLoS One; v. 6, n. 8 AUG 1 2011.
Web of Science Citations: 7

Thymic CD4(+)CD25(+) cells play an important role in immune regulation and are continuously developed in the thymus as an independent lineage. How these cells are generated, what are their multiple pathways of suppressive activity and which are their specific markers are questions that remain unanswered. To identify molecules involved in the function and development of human CD4(+)CD25(+) T regulatory cells we targeted thymic CD4(+)CD25(+) cells by peptide phage display. A phage library containing random peptides was screened ex vivo for binding to human thymic CD4(+)CD25(+) T cells. After four rounds of selection on CD4(+)CD25(+) enriched populations of thymocytes, we sequenced several phage displayed peptides and selected one with identity to the Vitamin D Receptor (VDR). We confirmed the binding of the VDR phage to active Vitamin D in vitro, as well as the higher expression of VDR in CD4(+)CD25(+) cells. We suggest that differential expression of VDR on natural Tregs may be related to the relevance of Vitamin D in function and ontogeny of these cells. (AU)