Single-Domain Antibodies for Targeting, Detection, and In Vivo Imaging of Human CD4+ Cells

September 14, 2022
Front Immunol
https://pubmed.ncbi.nlm.nih.gov/34956237

This article is currently being updated. View its version on PubMed.

https://pubmed.ncbi.nlm.nih.gov/34956237

Research summary

This study presents the development and characterization of novel single-domain antibodies (nanobodies) that specifically recognize human CD4. After thorough in vitro analysis, selected nanobodies were converted into immune tracers for noninvasive molecular imaging. Using a human CD4 Knockin mouse model, the study demonstrated that radiolabeled nanobodies could specifically accumulate in CD4⁺ T cell-rich tissues, enabling high-resolution imaging via immunoPET/MR.

Key outcome of the study

Radiolabeled CD4-specific nanobodies selectively accumulated in CD4⁺ T cell-rich organs in the hCD4-KI mice, demonstrating their potential as noninvasive imaging agents for monitoring CD4⁺ T cells in vivo.

Mouse model

Human CD4 Knockin (hCD4-KI) mouse model, engineered to express human CD4 in place of the murine counterpart, allowing for in vivo evaluation of human CD4-targeting agents.

TARGET:
CD4
T4 antigen, Leu-3, L3T4

Keywords

Immunotherapy, CD4⁺ T cell imaging, Nanobody-based diagnostics, Molecular imaging, PET/MR

Technical specifications

Humanized Knockin model, CD4 gene replacement, Nanobody development, ImmunoPET imaging

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