目的研究三七总皂苷(PNS)对H9c2心肌细胞P450酶主要亚型表达的影响。方法不同浓度的PNS处理H9c2细胞48h,MTS法检测细胞的存活率,测定LDH释放率评价细胞损伤程度,Real Time PCR法检测PNS各处理组对CYP450酶各亚型mRNA表达的变化。结果 MT...目的研究三七总皂苷(PNS)对H9c2心肌细胞P450酶主要亚型表达的影响。方法不同浓度的PNS处理H9c2细胞48h,MTS法检测细胞的存活率,测定LDH释放率评价细胞损伤程度,Real Time PCR法检测PNS各处理组对CYP450酶各亚型mRNA表达的变化。结果 MTS结果表明随着PNS浓度的增大,细胞的存活率逐渐降低并呈浓度依赖性,IC50(5.28±0.08)g·L-1,同时LDH的释放率也逐渐增大。在对P450酶mRNA表达影响层面,PNS使CYP2J3、CYP4A1、CYP4A2、CYP4F1和CYP4F5表达上调(P<0.05或P<0.01);对CYP2C11、CYP4A3和CYP4F4表达下调(P<0.05或P<0.01),但高浓度时(5 g·L-1)对CYP4A3和CYP4F4有上调作用(P<0.01)。结论 PNS对心脏和血管有一定的保护作用,高浓度(5 g·L-1)的PNS对H9c2细胞有一定细胞毒作用,因此使用PNS时应注意用药剂量,使其发挥疗效而尽量减少药物不良反应的发生。展开更多
Objective: To clone cytochrome P450 from Aedes aegypti(Ae. aegypti) and determine the characteristics using bioinformatics tools. Methods: Cytochrome P450 of Ae. aegypti was amplified using polymerase chain reaction, ...Objective: To clone cytochrome P450 from Aedes aegypti(Ae. aegypti) and determine the characteristics using bioinformatics tools. Methods: Cytochrome P450 of Ae. aegypti was amplified using polymerase chain reaction, cloned and sequenced. Evolutionary relationship of the sequence was inferred and bioinformatics tools were used to predict subcellular localisation, signal peptide, transmembrane helix, phosphorylation, O-glycosylation, secondary and tertiary structures of the deduced protein. Results: Polymerase chain reaction rather amplified a cytochrome P450 pseudogene which was named CYP4H44P(Gen Bank accession number KF779932). The pseudogene has 1537 nucleotides and an open reading frame of 335 amino acids containing cytochrome P450 motifs except the Wxxx R motif. It is highly homologous to CYP4H28 and CYP4H28v2. Phylogenetic analysis and evolutionary divergence showed strong clustering with CYP4H28 alleles and least divergence from the alleles respectively. The deduced protein was predicted to be found in the cytoplasm and likely to be phosphorylated but devoid of signal peptide, transmembrane helix and O-glycosylated sites. The secondary and tertiary structures were also generated. Conclusions: A cytochrome P450 pseudogene, CYP4H44 P was cloned from Ae. aegypti. The pseudogene is homologous with CYP4H28 alleles and seems to have recently diverged from this group. Isolating this pseudogene is an important step for evaluating its biological role in the mosquito and for the evolutionary analysis of Ae. aegypti CYPs.展开更多
基金funded by the Malaysian Ministry of Education(ERGS 203/PJJAUH/6730097)Universiti Sains Malaysia(RU grant 1001/PJJAUH/815095)
文摘Objective: To clone cytochrome P450 from Aedes aegypti(Ae. aegypti) and determine the characteristics using bioinformatics tools. Methods: Cytochrome P450 of Ae. aegypti was amplified using polymerase chain reaction, cloned and sequenced. Evolutionary relationship of the sequence was inferred and bioinformatics tools were used to predict subcellular localisation, signal peptide, transmembrane helix, phosphorylation, O-glycosylation, secondary and tertiary structures of the deduced protein. Results: Polymerase chain reaction rather amplified a cytochrome P450 pseudogene which was named CYP4H44P(Gen Bank accession number KF779932). The pseudogene has 1537 nucleotides and an open reading frame of 335 amino acids containing cytochrome P450 motifs except the Wxxx R motif. It is highly homologous to CYP4H28 and CYP4H28v2. Phylogenetic analysis and evolutionary divergence showed strong clustering with CYP4H28 alleles and least divergence from the alleles respectively. The deduced protein was predicted to be found in the cytoplasm and likely to be phosphorylated but devoid of signal peptide, transmembrane helix and O-glycosylated sites. The secondary and tertiary structures were also generated. Conclusions: A cytochrome P450 pseudogene, CYP4H44 P was cloned from Ae. aegypti. The pseudogene is homologous with CYP4H28 alleles and seems to have recently diverged from this group. Isolating this pseudogene is an important step for evaluating its biological role in the mosquito and for the evolutionary analysis of Ae. aegypti CYPs.
