Vaccine delivery by penetratin: mechanism of antigen presentation by dendritic cells.

Abstract:

:Cell-penetrating peptides (CPP) or membrane-translocating peptides such as penetratin from Antennapedia homeodomain or TAT from human immunodeficiency virus are useful vectors for the delivery of protein antigens or their cytotoxic (Tc) or helper (Th) T cell epitopes to antigen-presenting cells. Mice immunized with CPP containing immunogens elicit antigen-specific Tc and/or Th responses and could be protected from tumor challenges. In the present paper, we investigate the mechanism of class I and class II antigen presentation of ovalbumin covalently linked to penetratin (AntpOVA) by bone marrow-derived dendritic cells with the use of biochemical inhibitors of various pathways of antigen processing and presentation. Results from our study suggested that uptake of AntpOVA is via a combination of energy-independent (membrane fusion) and energy-dependent pathways (endocytosis). Once internalized by either mechanism, multiple tap-dependent or independent antigen presentation pathways are accessed while not completely dependent on proteasomal processing but involving proteolytic trimming in the ER and Golgi compartments. Our study provides an understanding on the mechanism of antigen presentation mediated by CPP and leads to greater insights into future development of vaccine formulations.

journal_name

Immunol Res

journal_title

Immunologic research

authors

Pouniotis D,Tang CK,Apostolopoulos V,Pietersz G

doi

10.1007/s12026-016-8799-5

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

887-900

issue

4

eissn

0257-277X

issn

1559-0755

pii

10.1007/s12026-016-8799-5

journal_volume

64

pub_type

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