Novel sphingosine-containing analogues selectively inhibit sphingosine kinase (SK) isozymes, induce SK1 proteasomal degradation and reduce DNA synthesis in human pulmonary arterial smooth muscle cells
作者:Hoe-Sup Byun、Susan Pyne、Neil MacRitchie、Nigel J. Pyne、Robert Bittman
DOI:10.1039/c3md00201b
日期:——
Sphingosine 1-phosphate (S1P) is involved in hyper-proliferative diseases such as cancer and pulmonary arterial hypertension. We have synthesized inhibitors that are selective for the two isoforms of sphingosine kinase (SK1 and SK2) that catalyze the synthesis of S1P. A thiourea adduct of sphinganine (F02) is selective for SK2 whereas the 1-deoxysphinganines 55-21 and 77-7 are selective for SK1. (2S,3R)-1-Deoxysphinganine (55-21) induced the proteasomal degradation of SK1 in human pulmonary arterial smooth muscle cells and inhibited DNA synthesis, while the more potent SK1 inhibitors PF-543 and VPC96091 failed to inhibit DNA synthesis. These findings indicate that moderate potency inhibitors such as 55-21 are likely to have utility in unraveling the functions of SK1 in inflammatory and hyperproliferative disorders.
Sphingosine 1-phosphate(S1P)参与了癌症和肺动脉高压等过度增生性疾病。我们合成了针对合成S1P的两个同工酶(SK1和SK2)的选择性抑制剂。Sphinganine(F02)的硫脲加合物对SK2具有选择性,而1-脱氧鞘氨醇55-21和77-7对SK1具有选择性。(2S,3R)-1-脱氧鞘氨醇(55-21)诱导了人肺动脉平滑肌细胞中SK1的蛋白酶体降解并抑制了DNA合成,而效力更强的SK1抑制剂PF-543和VPC96091未能抑制DNA合成。这些发现表明,如55-21这样的中等效力抑制剂可能在剖析SK1在炎症和过度增生性疾病中的功能方面具有应用价值。