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OBJECTIVE: Successful HIV vaccine and entry inhibitor development depends on use of assay systems that closely reflect in-vivo activities. Recent reports suggest that the currently most widely used assay format, which relies on the genetically engineered target cell line TZM-bl, can fail to detect certain neutralization activities detected on primary peripheral blood mononuclear cell (PBMC)-based assay systems. In the present study, we investigate the influence the target cell context bears on HIV entry inhibition. DESIGN: In a comprehensive survey, the effect of 11 neutralizing antibodies and inhibitors in blocking entry of 30 envelope pseudotyped virus strains in two types of target cells, PBMC and TZM-bl, was evaluated. METHODS: Env-pseudotyped HIV infection of PBMC and TZM-bl cells. RESULTS: We demonstrate here that depending on the type of inhibitor, relative neutralization potencies are shifted to a variable extent and direction on TZM-bl and PBMC cells. In our assay set up, differences in inhibitor activity were solely effected by the target cell environment and amounted up to 2-3 logs lower activity on TZM-bl cells in several cases. Overall, neutralizing antibodies, 2G12, 2F5 and 4E10, were less active in the TZM-bl system, whereas CD4 binding site directed inhibitor activities were detected equally well on both target cells, raising concerns that the TZM-bl assay may overrate the relevance of CD4 binding site specific responses. CONCLUSION: Our data strongly argue that preclinical assessment should not be restricted to a single type of assay, as systematic underestimation or overestimation of activities would be inevitable.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Institute of Medical Virology|
04 Faculty of Medicine > University Hospital Zurich > Clinic for Infectious Diseases
|DDC:||570 Life sciences; biology|
610 Medicine & health
|Deposited On:||26 Jan 2010 15:23|
|Last Modified:||23 Nov 2012 15:47|
|Publisher:||Lippincott Wiliams & Wilkins|
|Free access at:||Publisher DOI. An embargo period may apply.|
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