Towards depersonalized abacavir therapy: chemical modification eliminates HLA-B*57 : 01-restricted CD8+ T-cell activation.
AIDS
; 29(18): 2385-95, 2015 Nov 28.
Article
em En
| MEDLINE
| ID: mdl-26372480
ABSTRACT
OBJECTIVE:
Exposure to abacavir is associated with T-cell-mediated hypersensitivity reactions in individuals carrying human leukocyte antigen (HLA)-B57 01. To activate T cells, abacavir interacts directly with endogenous HLA-B57 01 and HLA-B57 01 expressed on the surface of antigen presenting cells. We have investigated whether chemical modification of abacavir can produce a molecule with antiviral activity that does not bind to HLA-B57 01 and activate T cells.DESIGN:
An interdisciplinary laboratory study using samples from human donors expressing HLA-B57 01. Researchers were blinded to the analogue structures and modelling data.METHODS:
Sixteen 6-amino substituted abacavir analogues were synthesized. Computational docking studies were completed to predict capacity for analogue binding within HLA-B57 01. Abacavir-responsive CD8 clones were generated to study the association between HLA-B57 01 analogue binding and T-cell activation. Antiviral activity and the direct inhibitory effect of analogues on proliferation were assessed.RESULTS:
Major histocompatibility complex class I-restricted CD8 clones proliferated and secreted IFNγ following abacavir binding to surface and endogenous HLA-B57 01. Several analogues retained antiviral activity and showed no overt inhibitory effect on proliferation, but displayed highly divergent antigen-driven T-cell responses. For example, abacavir and N-propyl abacavir were equally potent at activating clones, whereas the closely related analogues N-isopropyl and N-methyl isopropyl abacavir were devoid of T-cell activity. Docking abacavir analogues to HLA-B57 01 revealed a quantitative relationship between drug-protein binding and the T-cell response.CONCLUSION:
These studies demonstrate that the unwanted T-cell activity of abacavir can be eliminated whilst maintaining the favourable antiviral profile. The in-silico model provides a tool to aid the design of safer antiviral agents that may not require a personalized medicines approach to therapy.
Texto completo:
1
Base de dados:
MEDLINE
Métodos Terapêuticos e Terapias MTCI:
Plantas_medicinales
Assunto principal:
Didesoxinucleosídeos
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Antígenos HLA-B
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Infecções por HIV
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Linfócitos T CD8-Positivos
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Fármacos Anti-HIV
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Hipersensibilidade a Drogas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
AIDS
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Reino Unido