Effects of Ara-C on neutral sphingomyelinase and mitogen- and stress-activated protein kinases in T-lymphocyte cell lines.

Effects of Ara-C on neutral sphingomyelinase and mitogen- and stress-activated protein kinases in T-lymphocyte cell lines.
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Ara-C 对 T 淋巴细胞系中中性鞘磷脂酶以及丝裂原和应激激活蛋白激酶的影响。

DOI:
10.1080/15216549600201313
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发表时间:
1996
期刊:
Biochemistry and molecular biology international
影响因子:
--
通讯作者:
Meier,KE
Meier,KE
中科院分区:
--
文献类型:
--
作者:
Bradshaw,CD;Ella,KM;Thomas,AL;Qi,C;Meier,KE

文献摘要

相似文献

中性鞘磷脂酶 (SMase)1 可以被细胞外信号激活产生神经酰胺,这可能会影响丝裂原激活蛋白激酶 (MAPK) 活性。在 Jurkat(一种人类 T 细胞系)和 EL4(一种鼠 T 细胞系)的膜中评估了中性 SMase 活性。 Ara-C 在 Jurkat 和 EL4 细胞中都能在 10 分钟内激活 SMase,而佛波酯 (PMA) 则没有效果。 PMA(而非 Ara-C 或神经酰胺)激活了 Jurkat 和 EL4 中的 ERK MAPK。 PMA 与离子霉素协同作用,在 10 分钟内激活 Jurkat 和 EL4 中的 JNK MAPK。 Ara-C 仅在长时间孵育(90-120 分钟)后才激活 JNK。因此,神经酰胺并不是 T 细胞系中 ERK 激活的阳性信号。 Ara-C 对 JNK 活性的影响可能是通过次级反应途径介导的。
Neutral sphingomyelinase (SMase)1 can be activated by extracellular signals to produce ceramide, which may affect mitogen‐activated protein kinase (MAPK) activities. Neutral SMase activity was assessed in membranes from Jurkat, a human T‐cell line, and EL4, a murine T‐cell line. Ara‐C activated SMase within 10 minutes in both Jurkat and EL4 cells, while phorbol ester (PMA) had no effect. PMA, but not Ara‐C or ceramides, activated ERK MAPKs in Jurkat and EL4. PMA acted synergistically with ionomycin to activate JNK MAPKs in Jurkat and EL4 within 10 minutes. Ara‐C activated JNKs only after prolonged incubation (90‐120 minutes). Thus, ceramide is not a positive signal for ERK activation in T‐cell lines. The effects of Ara‐C on JNK activity may be mediated through secondary response pathways.