Vectors and methods for genetic immunization
Improved DNA vaccine plasmids are disclosed. The improved plasmids eliminate all extraneous sequences, and have superior eukaryotic expression, improved yield and stability during bacterial production, facilitate flexible targeting of antigens to various intracellular destinations, and novel RNA-based functionality. These vectors are utilized in novel immunization methods wherein combinations of immunostimulatory DNA vaccine plasmids that target antigens to various intracellular destinations are used to elicit improved immune response.
1. A method for modifying the response of an individual to a pDNAVACCUltra-derived plasmid expression vector comprising the steps of:
a. cloning one or more genes that encode a protein or peptide antigen into a pDNAVACCUltra-derived plasmid expression vector that contains one or more immunostimulatory RNA elements that do not collectively activate protein kinase R, the pDNAVACCUltra-derived plasmid expression vector having the immunostimulatory RNA elements inserted between a convergently oriented eukaryotic transcriptional terminator and a pMB 1 or pUC origin; and
b. delivering the expression vector to a eukaryotic cell; and
c. evaluating immune response or protection after vector delivery.
2. The method of claim 1 , wherein said RNA element(s) are selected from the group consisting of: TLR-3 activating RNA; TLR-7 activating RNA; TLR-8 activating RNA; RIG-I activating RNA; Mda-5 activating RNA; RIG-I and Mda5 activating RNA; TLR-3 and PKR activating RNA combined with PKR inhibiting RNA; TLR-7 and PKR activating RNA combined with PKR inhibiting RNA; TLR-8 and PKR activating RNA combined with PKR inhibiting RNA; RIG-I and PKR activating RNA combined with PKR inhibiting RNA; Mda5 and PKR activating RNA combined with PKR inhibiting RNA; RIG-I, Mda5, and PKR activating RNA combined with PKR inhibiting RNA; TLR-3, TLR-7, TLR-8, RIG-I, Mda5, and PKR activating RNA combined with PKR inhibiting RNA; and combinations thereof.
3. The method of claim 1 , wherein said RNA element(s) are used to promote one or more innate immune responses.
4. The method of claim 1 , wherein said RNA element(s) are used to promote one or more adaptive immune responses.
5. The method of claim 1 , wherein said RNA element(s) are additionally combined with one or more RNA(s) to alter more than one cellular function or pathway.
6. The method of claim 1 , wherein said RNA element(s) are selected from the group consisting of those that produce: a single stranded RNA; a double stranded RNA; a hairpin RNA; a microRNA; a RNA aptamer; a ribozyme, and combinations thereof.
7. The method of claim 1 , wherein said individual is a mammal, bird or fish.
8. A method for modifying the response of an individual to a pDNAVACCUltra-derived plasmid expression vector comprising the steps of:
a. cloning one or more genes that encode a protein or peptide into a pDNAVACCUltra-derived plasmid expression vector that contains one or more immunostimulatory RNA elements that do not collectively activate protein kinase R, the pDNAVACCUltra-derived plasmid expression vector having the immunostimulatory RNA elements inserted between a convergently oriented eukaryotic transcriptional terminator and a pMB1 or pUC origin, the pDNAVACCUltra-derived plasmid expression vector including a prokaryotic region having a replication origin and a Kanamycin resistance gene; and
b. delivering the expression vector to a eukaryotic cell; and
c. evaluating immune response or protection after vector delivery.