Abstract
Diacylglycerol kinase (DGK) is responsible for the enzymatic conversion of diacylglycerol to phosphatidic acid. Since both diacylglycerol and phosphatidic acid serve as signaling molecules, DGK is regarded as a hub between diacylglycerol-mediated and phosphatidic acid-mediated signaling. One of the 10 DGK isozymes, DGKα, is shown to be involved in T cell function. Transfection studies using tagged expression vectors revealed that DGKα localizes to the cytoplasm and nucleus and translocates to the plasma membrane in response to T cell receptor stimulation. However, a limited number of studies reported the localization of native protein of DGKα in tissues and cells. In this study, we immunized mice with recombinant DGKα and developed several anti-DGKα monoclonal antibodies (mAbs). One of the established anti-DGKα mAbs is a clone DaMab-2 (mouse IgG1, kappa). In enzyme-linked immunosorbent assay, DaMab-2 recognized only DGKα, and did not react with the other isozymes, such as DGKγ, DGKζ, DGKη, and DGKδ. Importantly, DaMab-2 is very useful in immunocytochemical analysis of human cultured cells, indicating that DaMab-2 is advantageous to analyze the localization and function of DGKα.
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