[Effect of OCT4A Gene on the Biological Characteristics of K562 Cells]
Fan-Jing Meng1, Jiang Cao2, Chong Chen2
1Department of Hematology, The Second People's Hospital of Lianyungang City, Lianyungang 222000, Jiangsu Province, China.
Objective:
To evaluate biological effects of OCT4A gene on K562 cells and explore the molecular mechanism of K562 cell apoptosis.
Methods:
Two recombinant lentiviral vectors were constructed, which could stablely up- regulate and down- regulate OCT4A protein. Recombinant lentivirus was generated by co-transfection of three-plasmids and transfec-ted into K562 cells. The experiments were divided into 5 groups: normal, pLVX-OCT4A-ZsGreen1, pLVX vector control, PLB-OCT4A shRNA and non-specific shRNA groups. Western blot was applied to detect the expression of OCT4A protein, the cell counting kit-8 was applied to evaluate the effect of OCT4A on proliferation of K562 cells. The apoptosis and differentiation of K562 cells were detected by flow cytometry with AnnexinV/7-AAD double staining. The mRNA expressions of caspase-3,BIM,BCL-xL,BAX in K562 cells were determined by real time PCR.
Results:
The OCT4A fragment was amplified by reverse transcription polymerase chain reaction(RT-PCR), the 2 lentiviral vectors were successfully constructed. In comparson with those in the control group, the expression of OCT4A protein of pLVX-OCT4A-ZsGreen1 group was significantly increased, but decreased in PLB-OCT4A shRNA group. CCK-8 assay showed that the higher the content of OCT4A protein, the faster the cell proliferation. The apoptosis rate was (3.48±0.52)% of pLVX-OCT4A-ZsGreen1 group, which was lower than that of control group, while the apoptosis rate PLB-OCT4A shRNA group was (7.25±0.57)%, which was higher than that of control group (P<0.05), however, the K562 cells differentiation was not influenced(P>0.05). Compared with control group, the gene expression of Caspase-3,BIM and BAX was down-regulated(P>0.05), but a significant up-regulation of BCL-xL gene expression was observed(P<0.05).
Conclusion:
Two lentiviral vectors have been successfully constructed, which can stably up- and down- regulate the expression of OCT4A in K562 cells respectively. OCT4A can promote the K562 cell proliferation and inhibit the apoptosis, the mechanism may be related with up-regulation of BCL-xl expression.
Insights
Octamer-binding transcription factor 4A (OCT4A) promotes K562 cell proliferation and inhibits apoptosis. Upregulation of BCL-xL expression is implicated in OCT4A
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Octamer-binding transcription factor 4A (OCT4A) is a key transcription factor involved in maintaining pluripotency and regulating cell differentiation.
- Dysregulation of OCT4A is implicated in the development and progression of various cancers, including leukemia.
- Understanding the role of OCT4A in cancer cells is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the biological effects of OCT4A gene expression on K562 cells, a human chronic myeloid leukemia cell line.
- To elucidate the molecular mechanisms underlying OCT4A-mediated apoptosis in K562 cells.
Main Methods:
- Construction of two recombinant lentiviral vectors to stably up-regulate and down-regulate OCT4A expression in K562 cells.
- Assessment of OCT4A protein levels using Western blot.
- Evaluation of cell proliferation using the Cell Counting Kit-8 (CCK-8) assay.
- Detection of apoptosis and differentiation via flow cytometry (AnnexinV/7-AAD staining).
- Quantification of mRNA expression for apoptosis-related genes (caspase-3, BIM, BCL-xL, BAX) using real-time PCR.
Main Results:
- Successful construction of lentiviral vectors leading to significant increase or decrease in OCT4A protein expression.
- OCT4A overexpression promoted K562 cell proliferation, while OCT4A knockdown inhibited it.
- OCT4A overexpression reduced apoptosis rates, whereas knockdown increased apoptosis.
- No significant effect of OCT4A on K562 cell differentiation was observed.
- Gene expression analysis revealed down-regulation of Caspase-3, BIM, and BAX, and significant up-regulation of BCL-xL in response to OCT4A modulation.
Conclusions:
- The study successfully established lentiviral vectors for manipulating OCT4A expression in K562 cells.
- OCT4A promotes K562 cell proliferation and inhibits apoptosis.
- The anti-apoptotic effect of OCT4A may be mediated through the up-regulation of BCL-xL expression.
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