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.
中科院分区:
文献类型:
--
作者:
Murakami Y;Murakami C;Hoshino F;Lu Q;Akiyama R;Yamaki A; Takahashi D;Sakane F.
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.