省千人韓兵男教授團隊在海洋藍藻毒素研究中取得突破

Dose?response study of neo-debromoaplysiatoxin A (1) and B (2) with Kv1.5 expression in CHO cells

2018年1月18日,美國化學學會(ACS)有機化學領(lǐng)域權(quán)威期刊Organic Letters?(影響因子6.6)?在線發(fā)表了浙江理工大學生命科學學院韓兵男教授團隊與上海交大醫(yī)學院林厚文教授團隊在海洋藍藻毒素Aplysiatoxins的活性靶標合作研究中取得的重要成果“Two Marine Cyanobacterial Aplysiatoxin Polyketides, Neo-debromoaplysiatoxin A and B, with K+ Channel Inhibition Activity”(DOI:10.1021/acs.orglett.7b03672)。

Organic Letters
Organic Letters

Aplysiatoxins一直以來被認為是一類有爭議的海洋生物毒素,研究顯示其具有PKC激酶激活作用,從而產(chǎn)生多種生物活性,促瘤、抗腫瘤及抗病毒等。本研究在采自中國南海的藍藻Lyngbya sp.代謝物中首次發(fā)現(xiàn)了兩個結(jié)構(gòu)新穎的aplysiatoxins類似物,Neo-debromoaplysiatoxin A and B(化合物1-2)。 并運用現(xiàn)代波譜學手段,結(jié)合X-ray單晶衍射和ECD分子計算確定其平面及立體結(jié)構(gòu)。研究人員使用鈉離子通道(Nav1.5,Nav1.7,Nav1.8)和鉀離子通道(hERG,Kv1.5,Kir2.1)對化合物1和2進行了活性篩選,結(jié)果顯示化合物1和2只對鉀離子通道Kv1.5有強烈抑制作用(IC50值分別為6.94±0.26?μM和0.30±0.05 μM)。

Dose?response study of neo-debromoaplysiatoxin A (1) and B (2) with Kv1.5 expression in CHO cells
Dose?response study of neo-debromoaplysiatoxin A (1) and B (2) with Kv1.5 expression in CHO cells

在PKC激酶激活實驗中發(fā)現(xiàn),化合物1和已知化合物debromoaplysiatoxin都能夠促使PKC激酶磷酸化,而化合物2即使在10 μM的濃度下對PKCδ并沒有顯示任何激活作用。從結(jié)果推測,化合物2跟以往aplysiatoxins作為PKC激酶激活劑的調(diào)控機制不一樣,是一種新型鉀離子通道抑制劑,為今后研究aplysiatoxins作為PKC激酶激活劑來調(diào)控下游信號通路提供了不一樣的思路。Kv1.5鉀離子通道僅在人心房肌中表達,是一種房顫治療的新靶點,特異性Kv1.5通道阻滯劑對心房具有高度選擇性,不引發(fā)室性心律失常,極有可能成為未來心房顫動治療的新型主導藥物之一。

Effect of debromoaplysiatoxin, compounds 1?and?2?on phosphor-PKCδ expression in HepG2 cells. (A), (C), (E)?Cells were treated with indicated concentration (0.5 μM, 5 μM, 10 μM) of?debromoaplysiatoxin, compounds 1?and 2, PMA (0.1 μM) for 1 h and the expression of?p-PKCδ protein was determined to use cell lysates by western blotting. The pictures of (B),?(D) and (F) are the corresponding statistical data results.
Effect of debromoaplysiatoxin, compounds 1?and?2?on phosphor-PKCδ expression in HepG2 cells. (A), (C), (E)?Cells were treated with indicated concentration (0.5 μM, 5 μM, 10 μM) of?debromoaplysiatoxin, compounds 1?and 2, PMA (0.1 μM) for 1 h and the expression of?p-PKCδ protein was determined to use cell lysates by western blotting. The pictures of (B),?(D) and (F) are the corresponding statistical data results.

 

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