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Updated: Aug 8, 2026
Generation of Multivirus-specific T Cells to Prevent/treat Viral Infections after Allogeneic Hematopoietic Stem Cell Transplant
Published on: May 27, 2011
Multiple CTL specificities against autologous HIV-1-infected BLCLs
P M Ahearne1, R A Morgan, M W Sebastian
1Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710.
Insights
Researchers developed a new method to study cellular immune responses to HIV-1. This approach uses HIV-1-infected B-lymphocyte cell lines (BLCLs) to better represent in vivo targets for analyzing T-cell responses.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Cellular immune responses to Human Immunodeficiency Virus type 1 (HIV-1) are crucial but not fully understood.
- Previous studies on cytotoxic T-lymphocyte (CTL) specificities often used artificial constructs, limiting understanding of patient responses to autologous HIV-1-infected cells.
Purpose of the Study:
- To develop a more accurate in vitro model for studying patient cellular reactivity against HIV-1-infected cells.
- To characterize the nature of the cellular immune response elicited by autologous HIV-1-infected cells.
Main Methods:
- Utilized two strategies to enhance CD4 expression in B-lymphocyte cell lines (BLCLs).
- Infected enhanced BLCLs with multiple HIV-1 strains.
- Assessed recognition and lysis of HIV-1-infected BLCLs by autologous effector cells.
- Characterized the mediating cells (CD8+) and restriction (MHC Class I).
Main Results:
- HIV-1-infected BLCLs were successfully generated and recognized by autologous effector cells.
- Cytolytic specificities were directed against HIV-1 env, gag, and pol determinants.
- HIV-1-infected BLCLs elicited in vitro CTL responses mediated by CD8+ cells in an MHC Class I-restricted manner.
Conclusions:
- HIV-1-infected BLCLs serve as a more natural and representative in vivo cellular target model compared to existing systems.
- This model facilitates a more accurate analysis of CTL responses during HIV-1 infection and post-vaccination.
Abstract:
The cellular immune response to HIV-1 has been well studied but, in many respects, remains incompletely defined. Although CTL specificities against highly conserved HIV-1 determinants as dictated by vaccinia/HIV-1 vector constructs have been described, much less is known regarding patient cellular reactivities against autologous cells infected with HIV-1. One of the main obstacles in characterizing this cellular reactivity has been the absence of a targeting system which accurately represents the HIV infected cell in vivo and is, at the same time, adaptable for in vitro assays. Through the use of two separate strategies aimed at increasing cellular CD4 expression, we were able to infect B-lymphocyte cell lines (BLCLs) with multiple strains of HIV-1. HIV-1-infected BLCLs were recognized by autologous effector cells with cytolytic specificities against env, gag, or pol determinants. In addition, HIV-1-infected BLCLs were capable of eliciting in vitro CTL reactivities directed against env-, gag-, and pol-expressing targets. This cellular reactivity was mediated by CD8+ cells and was MHC Class I restricted, suggesting a classical CTL response. Since multiple antigens are recognized, an HIV-1-infected BLCL is a more natural representation of an in vivo cellular target than other available testing systems and should permit a more representative analysis of CTL responses during infection or following vaccination.
