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Vasoactive intestinal peptide receptor 1 is downregulated during expansion of antigen-specific CD8 T cells following primary and secondary Listeria monocytogenes infections.

Abstract
As regulation of CD8 T cell homeostasis is incompletely understood, we investigated the expression profile of the vasoactive intestinal peptide (VIP) receptors, VPAC1 and VPAC2, on CD8 T cells throughout an in vivo immune response. Herein, we show that adoptively transferred CD8 T cells responding to a Listeria monocytogenes infection significantly downregulated, functionally active VPAC1 protein expression during primary and secondary expansion. VPAC1 mRNA expression was restored during contraction and regained naïve levels in primary, but remained low during secondary, memory generation. VIP co-administration with primary infection suppressed CD8 T cell expansion (≈ 50%). VPAC2 was not detected at any time points throughout primary and secondary infections. Collectively, our data demonstrate that functionally active VPAC1 is dynamically downregulated to render expanding CD8 T cells unresponsive to VIP.
AuthorsEmilie E Vomhof-DeKrey, Jodie S Haring, Glenn P Dorsam
JournalJournal of neuroimmunology (J Neuroimmunol) Vol. 234 Issue 1-2 Pg. 40-8 (May 2011) ISSN: 1872-8421 [Electronic] Netherlands
PMID21396722 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
CopyrightCopyright © 2011 Elsevier B.V. All rights reserved.
Chemical References
  • Antibodies
  • CD3 Complex
  • RNA, Messenger
  • Receptors, Vasoactive Intestinal Polypeptide, Type I
  • Thy-1 Antigens
  • Vasoactive Intestinal Peptide
  • Cyclic AMP
Topics
  • Adoptive Transfer (methods)
  • Animals
  • Antibodies (pharmacology)
  • CD3 Complex (immunology)
  • CD8-Positive T-Lymphocytes (drug effects, metabolism)
  • Cyclic AMP (metabolism)
  • Down-Regulation (immunology)
  • Enzyme-Linked Immunosorbent Assay (methods)
  • Flow Cytometry
  • Listeriosis (immunology, metabolism)
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • RNA, Messenger (metabolism)
  • Receptors, Vasoactive Intestinal Polypeptide, Type I (genetics, metabolism)
  • Thy-1 Antigens (genetics)
  • Time Factors
  • Vasoactive Intestinal Peptide (pharmacology)

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