INTRODUCTIONUpon the introduction of the combination antiretroviral therapy (cART), HIV infection has become a chronic disease. However, cART is unable to eradicate the virus and fails to restore the CD4 counts in about 30% of the treated individuals. Furthermore, treatment is life-long, and it does not protect from morbidities typically observed in the elderly. Therapeutic vaccines represent the most cost-effective intervention to intensify or replace cART.AREAS COVEREDHere, we briefly discuss the obstacles to the development and evaluation of the efficacy of therapeutic vaccines and review recent approaches evaluated in clinical trials.EXPERT OPINIONAlthough vaccines were generally safe and immunogenic, evidence of efficacy was negligible or marginal in most trials. A notable exception is the therapeutic Tat vaccine approach showing promising results of cART intensification, with CD4 T-cell increase and proviral load reduction beyond those afforded by cART alone. Rationale and evidence in support of choosing Tat as the vaccine target are thoroughly discussed.

01 Apr 2020·Biotechnology LettersQ4 · ENGINEERING & TECHNOLOGY

Boosting Tat DNA vaccine with Tat protein stimulates strong cellular and humoral immune responses in mice

Q4 · ENGINEERING & TECHNOLOGY

Article

Author: Alipour, Samira ; Mahdavi, Atiyeh

The aim of the present study was to evaluate the efficacy of a novel DNA priming-protein boosting regimen in simultaneous enhancing humoral and cellular immunogenicity of the HIV-1-Tat-based candidate vaccines in mice. The experimental BALB/c mice were successfully immunized with the HIV-1-Tat DNA vaccine and boosted with the corresponding protein vaccine over a two-week interval and the elicitation of cellular and humoral immune responses were simultaneously assessed. The results showed that the prime-boost immunization has significantly given rise to lymphocyte proliferation and CTL responses, as well as the levels of both IgG and IgG antibodies compared to the other candidate vaccines. The results of the Th polarization also revealed that the Th1: Th2 indexes in the mice vaccinated with the HIV-1 Tat protein, Tat DNA, and the prime-boost vaccines were 1.03, 1.19, and 1.25, respectively. The results suggest that co-administration of the HIV-1-Tat DNA with the corresponding protein may serve as a potential formulation for enhancing of Tat vaccineinduced immunity and has measurable effects on shaping vaccines' induced Th polarization.

02 Jan 2020·Expert Review of VaccinesQ2 · MEDICINE

HIV therapeutic vaccines aimed at intensifying combination antiretroviral therapy

Q2 · MEDICINE

Review

Author: Tripiciano, Antonella ; Buttò, Stefano ; Monini, Paolo ; Moretti, Sonia ; Sgadari, Cecilia ; Ensoli, Fabrizio ; Ensoli, Barbara ; Picconi, Orietta ; Cafaro, Aurelio

Introduction: Although successful at suppressing HIV replication, combination antiretroviral therapy (cART) only partially restores immune functions and fails to reduce the latent HIV reservoir, thus requiring novel interventions for its intensification.Areas covered: Here are reviewed therapeutic vaccine candidates that are being developed to this goal. Among them, the Tat vaccine has been shown to promote immune restoration, including CD4+ T-cell recovery in low immunological responders, and to reduce the virus reservoirs well beyond what achieved with long-term suppressive cART.Expert opinion: The authors propose the Tat vaccine as a promising vaccine candidate for cART intensification toward HIV reservoirs depletion, functional cure, and eradication strategies, suggesting that targeting a key protein in the virus life cycle is pivotal to success.

100 Deals associated with Tat protein based HIV vaccine (Vaxxit)

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Indication	Highest Phase	Country/Location	Organization	Date
HIV Infections	Phase 2	ZA	Istituto Superiore di Sanità	28 Mar 2012

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Tat protein based HIV vaccine (Vaxxit)

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