CD44 microbeads accelerate HIV-1 infection in T cells

Area of Science:

• Virology
• Immunology
• Biotechnology

Background:

• Human immunodeficiency virus (HIV) isolation and replication assays can be challenging due to low viral loads in biological samples.
• Efficiently culturing and studying clinical HIV isolates requires methods that overcome low infectivity and coreceptor tropism.

Purpose of the Study:

• To evaluate the efficacy of super-paramagnetic CD44 MicroBeads in enhancing HIV-1 infectivity and facilitating viral replication.
• To assess the utility of CD44 MicroBeads for concentrating dilute viral samples and improving in vitro HIV expansion.

Main Methods:

• Incubation of HIV-1 (NL4-3 clone, X4- and R5-tropic primary isolates, clade C isolate) with super-paramagnetic CD44 MicroBeads.
• Infection of CEM T cell line and primary human CD4 T cells with bead-bound or free virus.
• Measurement of p24 production and viral integration as indicators of infectivity and replication.

Main Results:

• CD44 MicroBeads significantly enhanced the infectivity of bound HIV virions across various virus types and cell targets.
• Accelerated p24 production and increased fractions of infected cells were observed in bead-treated infections.
• Higher levels of viral integration were detected early in the infection cycle following bead incubation.
• The method facilitated rapid in vitro expansion of patient isolates, independent of coreceptor usage.

Conclusions:

• Super-paramagnetic CD44 MicroBeads serve as an effective tool for concentrating dilute HIV samples.
• These beads directly enhance HIV infectivity and facilitate rapid in vitro replication, improving the performance of HIV assays.
• CD44 MicroBeads offer a valuable method for studying diverse HIV isolates, including those from patients, in a timely manner.