文献类型： 外文期刊

作者： Zhang, Xue ¹ ; Mei, Chen ³ ; Liang, Zhixuan ¹ ; Zhi, Yan ¹ ; Xu, Haojun ³ ; Wang, Hongjun ³ ; Dong, Hong ¹ ;

作者机构： 1.Beijing Univ Agr, Beijing Key Lab Tradit Chinese Vet Med, 7 Huilongguan Beinonglu, Beijing, Peoples R China

2.Beijing Univ Agr, Beijing Tradit Chinese Vet Engn Ctr, Beijing 7 Huilonggua, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, 9 Shuguang Huayuan Zhonglu, Beijing, Peoples R China

关键词： AKT/mTOR pathway; apoptosis; canine mammary carcinoma; homoharringtonine; traditional Chinese medicine

期刊名称：VETERINARY AND COMPARATIVE ONCOLOGY （ 影响因子：2.1； 五年影响因子：2.2 ）

ISSN： 1476-5810

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Mammary tumour is the most common type of tumour in dogs, especially in unneutered female dogs. Homoharringtonine (HHT) is a natural alkaloid that can be used to treat various types of human tumour. However, the inhibitory effect and mechanism of HHT on canine mammary carcinomas (CMC) remain unclear. This study aimed to evaluate the inhibitory effect of HHT on CMC in vitro and determine its underlying molecular mechanism. The effects of HHT on the cytotoxicity of CMC U27 cells were evaluated by the cell counting kit-8, wound healing, and Transwell assays. HHT-induced apoptosis of U27 cells was detected by JC-1 and terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) assay. Moreover, the gene expression of B-cell lymphoma-2 (Bcl-2) and Bcl-2 associated X protein (Bax) were analysed using quantitative reverse transcription-polymerase chain reaction (RT-qPCR), and the protein expression of protein kinase B/mammalian target of rapamycin (AKT/mTOR) and mitochondrial apoptosis proteins were determined by western blotting. Furthermore, mammary tumour-bearing mouse models were established using 4T1 cells to evaluate the therapeutic effect of HHT. It was found that HHT could significantly down-regulated the protein expression of p-AKT, p-mTOR, and Bcl-2, and up-regulated the protein expression of P53, Bax, cleaved caspase-3, and cleaved caspase-9. In addition, HHT significantly suppressed both tumour volume and mass in mammary tumour mice. In conclusion, HHT damages CMC cells by inhibiting the AKT/mTOR signalling pathway and inducing mitochondrial apoptosis. Such findings lay a theoretical foundation for the clinical treatment of CMC and provide more options for clinical medication.