Related Experiment Video
Updated: Apr 11, 2026
Author Spotlight: Exploring Macrophage Immunometabolism Through Lentiviral Vector-Mediated Gene Manipulation
Published on: February 16, 2024
Lentiviral vectors containing mouse Csf1r control elements direct macrophage-restricted expression in multiple
Clare Pridans1, Simon Lillico1, Bruce Whitelaw1
1The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Scotland , UK.
Abstract:
The development of macrophages requires signaling through the lineage-restricted receptor Csf1r. Macrophage-restricted expression of transgenic reporters based upon Csf1r requires the highly conserved Fms-intronic regulatory element (FIRE). We have created a lentiviral construct containing mouse FIRE and promoter. The lentivirus is capable of directing macrophage-restricted reporter gene expression in mouse, rat, human, pig, cow, sheep, and even chicken. Rat bone marrow cells transduced with the lentivirus were capable of differentiating into macrophages expressing the reporter gene in vitro. Macrophage-restricted expression may be desirable for immunization or immune response modulation, and for gene therapy for lysosomal storage diseases and some immunodeficiencies. The small size of the Csf1r transcription control elements will allow the insertion of large "cargo" for applications in gene therapy and vaccine delivery.
Insights
Researchers developed a lentivirus using the Fms-intronic regulatory element (FIRE) to control gene expression specifically in macrophages. This tool shows broad species applicability for gene therapy and vaccine delivery.
Area of Science:
- Immunology and Gene Therapy
- Molecular and Cellular Biology
Background:
- Macrophage development relies on signaling via the colony-stimulating factor 1 receptor (Csf1r).
- Macrophage-specific gene expression is crucial for various therapeutic applications.
- The Fms-intronic regulatory element (FIRE) is essential for Csf1r-based reporter gene expression in macrophages.
Purpose of the Study:
- To develop a novel lentiviral vector for macrophage-restricted gene expression.
- To assess the efficacy of the FIRE element in directing transgene expression across multiple species.
- To explore the potential of this system for gene therapy and vaccine delivery.
Main Methods:
- Creation of a lentiviral construct incorporating the mouse FIRE and promoter.
- Transduction of rat bone marrow cells with the lentivirus.
- In vitro differentiation of transduced cells into macrophages expressing a reporter gene.
- Evaluation of reporter gene expression in various species (mouse, rat, human, pig, cow, sheep, chicken).
Main Results:
- The lentiviral construct successfully directed macrophage-restricted reporter gene expression.
- This expression was observed across a wide range of species, including mammals and birds.
- Transduced rat cells differentiated into macrophages expressing the reporter gene in vitro.
- The Csf1r transcription control elements are small, allowing for large genetic cargo insertion.
Conclusions:
- The FIRE element provides a robust mechanism for achieving macrophage-specific gene expression.
- This lentiviral system offers a versatile tool for gene therapy and vaccine development in diverse species.
- The system's efficiency and broad applicability make it promising for modulating immune responses and treating genetic disorders.
