Our priming combination recovered a range of diversity and the two primers often picked up taxa not detected by the other.
Ad-H4, rH4, the hetrologous prime boost combination, non-vaccinated, and BCG vaccinated mice were included.
In contrast, the heterologous prime boost combination resulted in augmentation of both the CD4 and CD8 response.
We clearly show that rH4/CAF01 induces primarily CD4 T cells, and Ad-H4 CD8 T cells, but the heterologous prime boost combination induces both CD4 and CD8 T cells.
Thus, mice vaccinated with the heterologous prime boost combination of rH4/Ad-H4 showed a bacterial reduction of 1.2 Log10±0.1 CFU, which was significantly higher than the protection in Ad-H4 and rH4 vaccinated mice (p<0.01 and p<0.001, respectively).
In the present study we therefore compared the well characterized vaccine fusion molecule rH4 (Ag85B-TB10.4) delivered either as a subunit vaccine in cationic liposomes (rH4/CAF01) expressed in an adeno5 vector (ad-H4) or as a heterologous prime boost combination.
As we had observed an increase in both CD4 and CD8 T cells in the group receiving the heterologous prime boost combination of rH4/Ad-H4, and increased protection, it was important to compare how the vaccine primed CD4/CD8 T cells responded to an M.tb infection (in the group where they were both induced, e.g. the rH4/Ad-H4 group).
Random priming in combination with poly-dT priming has proven to be somewhat more successful for generating cDNA from FPE RNA [ 6, 11].
To test this proposition, we have generated gene-based vaccine vectors expressing Ag85B from Mycobacterium tuberculosis (Mtb) and designed experiments to test their immunogenicity and protective efficacy particularly when given in heterologous prime-boost combination, with the initial DNA vaccine component given soon after birth.
Previously, replicating adenovirus type 5 host range (Ad5hr -HIV/SIV recombinAd5hr -HIV/SIV combination with SIV envelope boosting, recombinant significant, durable priminginn in 39% of rhesus macombinationr SIVmac251 challenge.
