Palmitic acid- and/or palmitoleic acid-containing phosphatidic acids are generated by diacylglycerol kinase α in starved Jurkat T cells

Palmitic acid- and/or palmitoleic acid-containing phosphatidic acids are generated by diacylglycerol kinase α in starved Jurkat T cells
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饥饿的 Jurkat T 细胞中的二酰甘油激酶 α 产生含有棕榈酸和/或棕榈油酸的磷脂酸

DOI:
10.1016/j.bbrc.2020.02.162
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发表时间:
2020
影响因子:
3.1
通讯作者:
Sakane F.
Sakane F.
中科院分区:
生物学4区
文献类型:
--
作者:
Murakami Y;Murakami C;Hoshino F;Lu Q;Akiyama R;Yamaki A; Takahashi D;Sakane F.

文献摘要

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二酰基甘油激酶(DGK)α增强黑色素瘤和肝细胞癌细胞的增殖,而相反,DGKα诱导T细胞的非增殖状态。我们先前发现,在血清饥饿(非增殖)条件下,DGKα在黑色素瘤细胞中产生含棕榈酸(16:0)的PA物质,如16:0/16:0-和16:0/18:0-PA。在本研究中,我们鉴定了血清饥饿(非增殖)条件下T细胞中DGKα产生的PA种类。我们发现血清饥饿显著增加Jurkat T细胞中许多PA种类的水平,例如14:1/16:1-、14:0/16:1-、14:0/16:0-、16:1/16:2-、16:1/16:1-、16:0/16:1-、16:0/16:0-、16:1/18:2-、16:1/18:1-、16:0/18:1-、16:0/18:0-、18:1/18:2-、18:1/18:1-和18:0/18:1-PA。在血清饥饿Jurkat T细胞的裂解物中,DGKα活性(其为Ca 2+依赖性且对DGKα特异性抑制剂(CU-3)敏感)显著增加,表明其活化。此外,CU-3(1-10 μM)显著降低了含棕榈酸和/或棕榈油酸(16:1)的PA种类的量,如14:1/16:1-、14:0/16:1-、14:0/16:0-、16:1/16:2-、16:1/16:1-、16:0/16:1-、16:0/16:0-、16:0/18:1-和16:0/18:0-PA,这些物质因血清饥饿而增加。这些结果表明,DGKα在饥饿的黑色素瘤细胞(含棕榈酸的PA种类)和T细胞(含棕榈酸和/或棕榈油酸(16:1)的PA种类)中产生不同的PA种类。因此,PA分子种类的差异可能解释了DGKα在黑色素瘤和T细胞中的相反功能。
Diacylglycerol kinase (DGK) α enhances the proliferation of melanoma and hepatocellular carcinoma cells whereas, in contrast, DGKα induces a nonproliferative state in T cells. We previously found that DGKα produces palmitic acid (16:0)-containing PA species, such as 16:0/16:0- and 16:0/18:0-PA, in melanoma cells under serum-starved (nonproliferative) conditions. In the present study, we identified the PA species generated by DGKα in T cells under serum-starved (nonproliferative) conditions. We found that serum starvation markedly increased the levels of many PA species, such as 14:1/16:1-, 14:0/16:1-, 14:0/16:0-, 16:1/16:2-, 16:1/16:1-, 16:0/16:1-, 16:0/16:0-, 16:1/18:2-, 16:1/18:1-, 16:0/18:1-, 16:0/18:0-, 18:1/18:2-, 18:1/18:1- and 18:0/18:1-PA, in Jurkat T cells. In lysates from serum-starved Jurkat T cells, DGKα activity, which was Ca2+-dependent and sensitive to a DGKα-specific inhibitor (CU-3), was substantially increased, indicating its activation. Moreover, CU-3 (1–10 μM) significantly reduced the amounts of palmitic acid- and/or palmitoleic acid (16:1)-containing PA species, such as 14:1/16:1-, 14:0/16:1-, 14:0/16:0-, 16:1/16:2-, 16:1/16:1-, 16:0/16:1-, 16:0/16:0-, 16:0/18:1- and 16:0/18:0-PA, which were increased by serum starvation. These results indicate that DGKα generates different PA species in starved melanoma cells (palmitic acid-containing PA species) and T cells (palmitic acid- and/or palmitoleic acid (16:1)-containing PA species). Therefore, the differences in the PA molecular species may account for the opposing functions of DGKα in melanoma and T cells.