毒理性
Secalonic acid D(SAD)被认为通过导致形成较小的腭板,这些腭板无法提升和融合,从而诱导腭裂。这种受抑制的腭板生长是SAD导致胚胎腭间充质(HEPM)细胞增殖减少的结果。SAD与cAMP反应元件结合蛋白(CREB)结合并使其磷酸化,CREB是一个重要的转录因子,对于包括增殖细胞核抗原(PCNA)基因在内的许多基因的表达是必需的。SAD对CREB的磷酸化阻止了它在转录起始位点形成必要的转录因子-cAMP反应元件复合物,因此这些基因无法表达。这导致腭间充质细胞数量减少,从而减少腭板生长,进而导致腭裂。(A3088,A3089,A3090)
Secalonic acid D (SAD) is though to induce cleft palate by causing the formation of smaller palatal shelves that fail to elevate and fuse. This inhibited palatal shelf growth is a result of the of SAD causing reduced proliferation of embryonic palatal mesenchymal (HEPM) cells. SAD binds to and phosphorylates cAMP response element binding protein (CREB), an important transcription factor required for the expression of numerous genes including proliferating cell nuclear antigen (PCNA) gene. The phosphorylation of CREB by SAD prevents it from forming the necessary transcription factor-cAMP response element complex at transcription start sites, so these genes are not expressed. This leads to reduced palatal mesenchymal cell number causing reduced palatal shelf growth and thus cleft palate. (A3088, A3089, A3090)
来源:Toxin and Toxin Target Database (T3DB)