Coinhibitory receptor PD-1H preferentially suppresses CD4⁺ T cell-mediated immunity.

T cell activation is regulated by the interactions of surface receptors with stimulatory and inhibitory ligands. Programmed death-1 homolog (PD-1H, also called VISTA) is a member of the CD28 family of proteins and has been shown to act as a coinhibitory ligand on APCs that suppress T cell responses. Here, we determined that PD-1H functions as a coinhibitory receptor for CD4⁺ T cells.

Multivalent DNA-based vectors for DNA vaccine delivery.

DNA can be utilized as a generic delivery vector as well as a traditional biological material for DNA vaccination. Although the use of DNA as an antigen expression vector or a vaccine adjuvant has been intensively studied for several decades, the use of DNA molecules as a delivery carrier has not been explored until recently. This issue is probably due to the topological limitation of DNA in its natural linear or circular structure form.