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Protein & Peptide Letters


ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Research Article

HIV-1 Accessory Proteins: Which one is Potentially Effective in Diagnosis and Vaccine Development?

Author(s): Alireza Milani, Kazem Baesi, Elnaz Agi, Ghazal Marouf, Maryam Ahmadi and Azam Bolhassani*

Volume 28, Issue 6, 2021

Published on: 31 December, 2020

Page: [687 - 698] Pages: 12

DOI: 10.2174/0929866528999201231213610

Price: $65


Background: The combination antiretroviral therapy (cART) could increase the number of circulating naive CD4 T lymphocytes, but was not able to eradicate human immunodeficiency virus-1 (HIV-1) infection.

Objective: Thus, induction of strong immune responses is important for control of HIV-1 infection. Furthermore, a simple and perfect serological method is required to detect virus in untreated-, treated- and drug resistant- HIV-1 infected individuals.

Methods: This study was conducted to assess and compare immunogenic properties of Nef, Vif, Vpr and Vpu accessory proteins as an antigen candidate in mice and their diagnostic importance in human as a biomarker.

Results: Our data showed that in mice, all heterologous prime/ boost regimens were more potent than homologous prime/ boost regimens in eliciting Th1 response and Granzyme B secretion as CTL activity. Moreover, the Nef, Vpu and Vif proteins could significantly increase Th1 immune response. In contrast, the Vpr protein could considerably induce Th2 immune response. On the other hand, among four accessory proteins, HIV-1 Vpu could significantly detect treated group from untreated group as a possible biomarker in human.

Conclusion: Generally, among accessory proteins, Nef, Vpu and Vif antigens were potentially more suitable vaccine antigen candidates than Vpr antigen. Human antibodies against all these proteins were higher in HIV-1 different groups than healthy group. Among them, Vpu was known as a potent antigen in diagnosis of treated from untreated individuals. The potency of accessory proteins as an antigen candidate in an animal model and a human cohort study are underway.

Keywords: HIV-1, accessory protein, diagnosis, therapeutic vaccine, delivery system, cell penetrating peptide.

Graphical Abstract
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