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Updated: Mar 8, 2026

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ESTABLISHMENT OF A STABLE GLUTAMATE DECARBOXYLELASE (GAD) EXPRESSING CELL-LINE BY TRANSFECTION.

Feng C Zhou, Christine Cheng, Sharon Bledsone

    Cell Transplantation
    |February 3, 2017
    PubMed
    Summary

    Researchers created a recombinant DNA clone for glutamic acid decarboxylase (GAD) gene expression in mouse cells. These GAD-expressing cells were successfully transplanted into mice, demonstrating GABA production in vivo.

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    Area of Science:

    • Molecular Biology
    • Neuroscience
    • Cell Biology

    Background:

    • Glutamic acid decarboxylase (GAD) is crucial for synthesizing gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter.
    • Recombinant DNA technology allows for the expression of specific genes in host cells.
    • Gene transfection and cell transplantation are key methods in studying gene function and therapeutic potential.

    Purpose of the Study:

    • To construct a recombinant DNA clone expressing the GAD gene in NIH-3T3 fibroblasts.
    • To evaluate the successful transfection, selection, and expression of GAD in cultured cells.
    • To assess the survival and function of GAD-transfected cells following transplantation into mice.

    Main Methods:

    • Construction of a pSV2GAD plasmid by ligating the GAD gene into the pSV2neo vector.
    • Transfection of NIH-3T3 fibroblasts using calcium phosphate precipitation or electroporation.
    • Selection of transfected cells using G418 antibiotic and identification via immunocytochemical staining for GAD.
    • Detection of GAD mRNA using in situ hybridization.
    • Transplantation of GAD-expressing fibroblasts into Swiss-Web mice and subsequent analysis using immunocytochemistry for fibronectin, GAD, and GABA.

    Main Results:

    • Successfully constructed and transfected NIH-3T3 cells with the pSV2GAD plasmid, achieving GAD expression.
    • GAD-immunoreactive cells were clearly distinguished from control cells.
    • GAD-positive cells exhibited granular staining in the cytoplasm and fiber extensions.
    • GAD mRNA was detected in transfected cell subcultures.
    • Transplanted GAD-expressing cells survived in mice and were positive for GAD and GABA, indicating in vivo functionality.

    Conclusions:

    • Recombinant GAD gene expression is achievable in NIH-3T3 fibroblasts.
    • GAD-transfected cells can be selected, identified, and transplanted successfully into a host organism.
    • The transplanted cells maintain GAD expression and produce GABA in vivo, suggesting potential therapeutic applications.