Related Experiment Video
Updated: Jun 6, 2026
A Three-dimensional Thymic Culture System to Generate Murine Induced Pluripotent Stem Cell-derived Tumor Antigen-specific Thymic Emigrants
Published on: August 9, 2019
[Study on the mechanism of THP-1 cell differentiation imduced by a new steroidal drug NSC67657]
Wei-Jia Wang1, Xiu-Ming Zhang, Dong-Mei Wen
1Zhongshan People's Hospital, Nanfang Medical University, Guangzhou 528402, China.
Objective:
To study the potential mechanism of the new steroidal drug NSC67657 induced leukemic cells differentiation.
Methods:
Cell proliferation was assayed by MTT assay. Surface antigen CD14 on THP-1 cells treated by NSC67657 at different time different concentration, was detected by flow cytometry (FCM). The expression of beta-catenin- interacting protein 1 (ICAT) gene and protein were detected by RT-PCR and Western blot. Eukaryotic expressing vector pDsRed-ICAT was constructed and transfected into HL60 cell line. FCM, Wright's staining and electronmicroscope were employed to analyse the differentiation of transfected THP-1 cells after they were treated with NSC67657 for 24 hours.
Results:
The proliferation of THP-1 cells was significantly inhibited by NSC67657 treatment. The level of CD14 expression was elevated in line with the increasing drug concentration and treatment time. 10 µmol/L NSC67657 treatment for five days was the optimal condition for the induction of THP-1 cells differentiation, when the CD14(+) THP-1 cells were more than 90%. Morphological study indentified the THP-1 cells of monocytic differentiation. The eukaryotic expressing vector pDSRed-ICAT was successfully constructed, and almost 90% positive clone could be obtained after G418 screening. Electro-transfection was employed for transfecting the vector into THP-1 cells. After the transfection the expression of ICAT gene and protein was increased. On the NSC67657 treatment, there was not significant difference in CD14 expression on transfected THP-1 cells compared to that on the control groups. After 24 h treatment, the transfected THP-1 cells remained in early differentiated stage.
Conclusion:
NSC67657 can induce THP-1 cell to monocytic differentiation and activate the expression of ICAT gene, but overexpression of ICAT itself is not sufficient to induce such differentiation.
Insights
The steroidal drug NSC67657 effectively induces monocytic differentiation in leukemic THP-1 cells by activating ICAT gene expression. However, overexpressing ICAT alone does not cause differentiation, indicating a complex mechanism.
Area of Science:
- Leukemia research
- Cellular differentiation mechanisms
- Pharmacological studies of steroidal drugs
Background:
- Leukemic cell differentiation is a therapeutic strategy.
- Understanding the molecular mechanisms of drug-induced differentiation is crucial.
- NSC67657 is a novel steroidal drug with potential anti-leukemic properties.
Purpose of the Study:
- To investigate the mechanism by which NSC67657 induces differentiation in leukemic cells.
- To examine the role of beta-catenin-interacting protein 1 (ICAT) in NSC67657-mediated differentiation.
- To assess the effects of NSC67657 on THP-1 cell proliferation and surface antigen expression.
Main Methods:
- Cell proliferation was assessed using MTT assays.
- Flow cytometry (FCM) was used to detect CD14 surface antigen expression on THP-1 cells.
- RT-PCR and Western blot analyzed ICAT gene and protein expression.
- A eukaryotic expressing vector for ICAT was constructed and transfected into THP-1 cells.
Main Results:
- NSC67657 significantly inhibited THP-1 cell proliferation.
- CD14 expression increased with drug concentration and duration, with optimal differentiation at 10 µmol/L for five days (>90% CD14+ cells).
- Morphological analysis confirmed monocytic differentiation; however, ICAT overexpression alone did not induce differentiation.
Conclusions:
- NSC67657 effectively induces monocytic differentiation in THP-1 cells.
- The drug activates ICAT gene expression during this process.
- Overexpression of ICAT alone is insufficient to induce leukemic cell differentiation, suggesting other pathways are involved.
