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A calcium-sensitive promoter construct for gene therapy
E Merlet1, L Lipskaia, A Marchand
1Transatlantic Cardiovascular Research Center, INSERM UMRS 956, UPMC-Paris 6, Paris, France.
Gene Therapy
|March 30, 2012
Summary
A novel nuclear factor of activated T cells (NFAT) promoter enhances gene therapy specificity. This targeted approach, activated by calcium, restricts transgene expression to diseased cells, showing promise for vascular proliferative diseases.
Area of Science:
- Biotechnology
- Molecular Biology
- Cardiovascular Research
Background:
- Targeting diseased cells specifically remains a significant challenge in developing effective pharmacological and biological therapeutics.
- Gene therapy offers a promising approach for rare diseases and conditions lacking alternative treatments, but off-target effects limit its clinical application.
- Enhancing gene transfer specificity to target organs is crucial for improving gene therapy safety and efficacy.
Purpose of the Study:
- To develop a novel promoter for targeted gene expression in diseased cells.
- To evaluate the efficiency and specificity of a new promoter containing nuclear factor of activated T cells (NFAT) consensus sequences.
- To assess the therapeutic potential of this promoter in a preclinical model of vascular disease.
Main Methods:
- Construction and characterization of a novel promoter with six NFAT consensus sequences.
- In vitro and in vivo assessment of promoter-driven gene expression in vascular smooth muscle cells.
- Evaluation of transgene expression in response to calcium signaling and endoplasmic reticulum depletion.
- Preclinical testing of gene therapy using the NFAT promoter to deliver sarco/endoplasmic reticulum (SR/ER) Ca(2+) ATPase 2a in a rat model of restenosis.
Main Results:
- The novel NFAT promoter demonstrated comparable efficiency to the cytomegalovirus (CMV) promoter in driving gene expression in vascular smooth muscle cells.
- Transgene expression driven by the NFAT promoter was activated in a calcium-dependent manner following endoplasmic reticulum depletion.
- Crucially, the NFAT promoter restricted transgene expression exclusively to proliferative and diseased cells, unlike the CMV promoter.
- Overexpression of sarco/endoplasmic reticulum (SR/ER) Ca(2+) ATPase 2a under the NFAT promoter significantly inhibited restenosis after angioplasty in rats.
Conclusions:
- The developed NFAT promoter offers a highly specific tool for gene therapy, enabling transgene expression predominantly in diseased cells.
- This promoter's calcium-dependent activation mechanism provides an additional layer of control, minimizing off-target effects.
- The NFAT promoter holds significant potential for therapeutic applications in vascular proliferative diseases and other conditions characterized by NFAT pathway upregulation.
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