Knocking down Dp71 expression in A549 cells reduces its malignancy in vivo and in vitro
Sichuang Tan1, Sipin Tan2,3, Zhikang Chen4
1a Department of Thoracic Surgery, Second Xiangya Hospital , Central South University , Changsha , Hunan , China.
Abstract:
Dp71 is one of the most ubiquitously expressed isoforms of dystrophin, the pathological genes of DMD. In order to find whether the alteration of Dp71 can affect the phenotypes of cell other than PC12, an A549 cell line with stably transfected Dp71 siRNA plasmids was set up and named A549-Dp71AS cell. It is demonstrated for the first time that the A549-Dp71AS cell line displayed decreased invasion capabilities, reduced migration ability, decreased proliferation rate, and lessened clonogenic formation. Cisplatin-induced apoptosis was also increased in A549-Dp71AS cell line via enhancing the Caspase 3, Caspase 8, and Caspase 9 activities. Knocking down Dp71 expression can significantly inhibit the A549 xenograft tumor growth in nude mice. The A549-Dp71AS cells and xenograft tumor tissues displayed reduced lamin B1, Bcl-2, and MMP2 protein expression, which accounts for the reduced malignancy of A549-Dp71AS cells in vivo and in vitro.
Insights
Knocking down Dp71, a dystrophin isoform, reduces lung cancer cell invasion, migration, and proliferation. This finding suggests Dp71 as a potential therapeutic target for inhibiting lung cancer progression and metastasis.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Dp71 is a widely expressed dystrophin isoform linked to Duchenne muscular dystrophy (DMD).
- Understanding Dp71's role in other cell types is crucial for exploring its broader pathological implications.
Purpose of the Study:
- To investigate the functional impact of Dp71 knockdown on A549 lung cancer cells.
- To determine if Dp71 alteration affects cancer cell phenotypes and tumor growth.
Main Methods:
- Established a stable A549 cell line with Dp71 siRNA (A549-Dp71AS).
- Assessed cell invasion, migration, proliferation, and clonogenic formation.
- Evaluated cisplatin-induced apoptosis and caspase activities.
- Monitored A549 xenograft tumor growth in nude mice.
- Analyzed protein expression of lamin B1, Bcl-2, and MMP2.
Main Results:
- A549-Dp71AS cells showed significantly reduced invasion, migration, proliferation, and colony formation.
- Dp71 knockdown enhanced cisplatin-induced apoptosis by increasing Caspase 3, 8, and 9 activities.
- Inhibition of Dp71 expression suppressed A549 xenograft tumor growth in vivo.
- Reduced expression of lamin B1, Bcl-2, and MMP2 was observed in A549-Dp71AS cells and tumors.
Conclusions:
- Dp71 knockdown significantly impairs malignant phenotypes of A549 lung cancer cells in vitro and in vivo.
- Reduced lamin B1, Bcl-2, and MMP2 expression contribute to the decreased malignancy.
- Targeting Dp71 offers a potential therapeutic strategy for lung cancer treatment.
